Mercurial > hg > truffle
diff src/share/vm/code/nmethod.cpp @ 7066:7d815d842ee0
Merge.
| author | Christian Haeubl <haeubl@ssw.jku.at> |
|---|---|
| date | Fri, 23 Nov 2012 11:50:27 +0100 |
| parents | 8c5333c80cfd 45029b3ac59f |
| children | 97d0eae99568 |
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--- a/src/share/vm/code/nmethod.cpp Fri Nov 23 11:40:17 2012 +0100 +++ b/src/share/vm/code/nmethod.cpp Fri Nov 23 11:50:27 2012 +0100 @@ -1,2864 +1,3016 @@ -/* - * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved. - * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. - * - * This code is free software; you can redistribute it and/or modify it - * under the terms of the GNU General Public License version 2 only, as - * published by the Free Software Foundation. - * - * This code is distributed in the hope that it will be useful, but WITHOUT - * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or - * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License - * version 2 for more details (a copy is included in the LICENSE file that - * accompanied this code). - * - * You should have received a copy of the GNU General Public License version - * 2 along with this work; if not, write to the Free Software Foundation, - * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. - * - * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA - * or visit www.oracle.com if you need additional information or have any - * questions. - * - */ - -#include "precompiled.hpp" -#include "code/codeCache.hpp" -#include "code/compiledIC.hpp" -#include "code/dependencies.hpp" -#include "code/nmethod.hpp" -#include "code/scopeDesc.hpp" -#include "compiler/abstractCompiler.hpp" -#include "compiler/compileBroker.hpp" -#include "compiler/compileLog.hpp" -#include "compiler/compilerOracle.hpp" -#include "compiler/disassembler.hpp" -#include "interpreter/bytecode.hpp" -#include "oops/methodDataOop.hpp" -#include "prims/jvmtiRedefineClassesTrace.hpp" -#include "prims/jvmtiImpl.hpp" -#include "runtime/sharedRuntime.hpp" -#include "runtime/sweeper.hpp" -#include "utilities/dtrace.hpp" -#include "utilities/events.hpp" -#include "utilities/xmlstream.hpp" -#include "utilities/machineCodePrinter.hpp" -#ifdef SHARK -#include "shark/sharkCompiler.hpp" -#endif -#ifdef GRAAL -#include "graal/graalJavaAccess.hpp" -#endif - -#ifdef DTRACE_ENABLED - -// Only bother with this argument setup if dtrace is available - -#ifndef USDT2 -HS_DTRACE_PROBE_DECL8(hotspot, compiled__method__load, - const char*, int, const char*, int, const char*, int, void*, size_t); - -HS_DTRACE_PROBE_DECL6(hotspot, compiled__method__unload, - char*, int, char*, int, char*, int); - -#define DTRACE_METHOD_UNLOAD_PROBE(method) \ - { \ - methodOop m = (method); \ - if (m != NULL) { \ - Symbol* klass_name = m->klass_name(); \ - Symbol* name = m->name(); \ - Symbol* signature = m->signature(); \ - HS_DTRACE_PROBE6(hotspot, compiled__method__unload, \ - klass_name->bytes(), klass_name->utf8_length(), \ - name->bytes(), name->utf8_length(), \ - signature->bytes(), signature->utf8_length()); \ - } \ - } -#else /* USDT2 */ -#define DTRACE_METHOD_UNLOAD_PROBE(method) \ - { \ - methodOop m = (method); \ - if (m != NULL) { \ - Symbol* klass_name = m->klass_name(); \ - Symbol* name = m->name(); \ - Symbol* signature = m->signature(); \ - HOTSPOT_COMPILED_METHOD_UNLOAD( \ - (char *) klass_name->bytes(), klass_name->utf8_length(), \ - (char *) name->bytes(), name->utf8_length(), \ - (char *) signature->bytes(), signature->utf8_length()); \ - } \ - } -#endif /* USDT2 */ - -#else // ndef DTRACE_ENABLED - -#define DTRACE_METHOD_UNLOAD_PROBE(method) - -#endif - -bool nmethod::is_compiled_by_c1() const { - if (compiler() == NULL || method() == NULL) return false; // can happen during debug printing - if (is_native_method()) return false; - return compiler()->is_c1(); -} -bool nmethod::is_compiled_by_c2() const { - if (compiler() == NULL || method() == NULL) return false; // can happen during debug printing - if (is_native_method()) return false; - return compiler()->is_c2(); -} -bool nmethod::is_compiled_by_shark() const { - if (is_native_method()) return false; - assert(compiler() != NULL, "must be"); - return compiler()->is_shark(); -} - - - -//--------------------------------------------------------------------------------- -// NMethod statistics -// They are printed under various flags, including: -// PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation. -// (In the latter two cases, they like other stats are printed to the log only.) - -// These variables are put into one block to reduce relocations -// and make it simpler to print from the debugger. -static -struct nmethod_stats_struct { - int nmethod_count; - int total_size; - int relocation_size; - int consts_size; - int insts_size; - int stub_size; - int scopes_data_size; - int scopes_pcs_size; - int dependencies_size; - int handler_table_size; - int nul_chk_table_size; - int oops_size; - - void note_nmethod(nmethod* nm) { - nmethod_count += 1; - total_size += nm->size(); - relocation_size += nm->relocation_size(); - consts_size += nm->consts_size(); - insts_size += nm->insts_size(); - stub_size += nm->stub_size(); - oops_size += nm->oops_size(); - scopes_data_size += nm->scopes_data_size(); - scopes_pcs_size += nm->scopes_pcs_size(); - dependencies_size += nm->dependencies_size(); - handler_table_size += nm->handler_table_size(); - nul_chk_table_size += nm->nul_chk_table_size(); - } - void print_nmethod_stats() { - if (nmethod_count == 0) return; - tty->print_cr("Statistics for %d bytecoded nmethods:", nmethod_count); - if (total_size != 0) tty->print_cr(" total in heap = %d", total_size); - if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size); - if (consts_size != 0) tty->print_cr(" constants = %d", consts_size); - if (insts_size != 0) tty->print_cr(" main code = %d", insts_size); - if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size); - if (oops_size != 0) tty->print_cr(" oops = %d", oops_size); - if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size); - if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size); - if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size); - if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size); - if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size); - } - - int native_nmethod_count; - int native_total_size; - int native_relocation_size; - int native_insts_size; - int native_oops_size; - void note_native_nmethod(nmethod* nm) { - native_nmethod_count += 1; - native_total_size += nm->size(); - native_relocation_size += nm->relocation_size(); - native_insts_size += nm->insts_size(); - native_oops_size += nm->oops_size(); - } - void print_native_nmethod_stats() { - if (native_nmethod_count == 0) return; - tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count); - if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size); - if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size); - if (native_insts_size != 0) tty->print_cr(" N. main code = %d", native_insts_size); - if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size); - } - - int pc_desc_resets; // number of resets (= number of caches) - int pc_desc_queries; // queries to nmethod::find_pc_desc - int pc_desc_approx; // number of those which have approximate true - int pc_desc_repeats; // number of _pc_descs[0] hits - int pc_desc_hits; // number of LRU cache hits - int pc_desc_tests; // total number of PcDesc examinations - int pc_desc_searches; // total number of quasi-binary search steps - int pc_desc_adds; // number of LUR cache insertions - - void print_pc_stats() { - tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query", - pc_desc_queries, - (double)(pc_desc_tests + pc_desc_searches) - / pc_desc_queries); - tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d", - pc_desc_resets, - pc_desc_queries, pc_desc_approx, - pc_desc_repeats, pc_desc_hits, - pc_desc_tests, pc_desc_searches, pc_desc_adds); - } -} nmethod_stats; - - -//--------------------------------------------------------------------------------- - - -ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) { - assert(pc != NULL, "Must be non null"); - assert(exception.not_null(), "Must be non null"); - assert(handler != NULL, "Must be non null"); - - _count = 0; - _exception_type = exception->klass(); - _next = NULL; - - add_address_and_handler(pc,handler); -} - - -address ExceptionCache::match(Handle exception, address pc) { - assert(pc != NULL,"Must be non null"); - assert(exception.not_null(),"Must be non null"); - if (exception->klass() == exception_type()) { - return (test_address(pc)); - } - - return NULL; -} - - -bool ExceptionCache::match_exception_with_space(Handle exception) { - assert(exception.not_null(),"Must be non null"); - if (exception->klass() == exception_type() && count() < cache_size) { - return true; - } - return false; -} - - -address ExceptionCache::test_address(address addr) { - for (int i=0; i<count(); i++) { - if (pc_at(i) == addr) { - return handler_at(i); - } - } - return NULL; -} - - -bool ExceptionCache::add_address_and_handler(address addr, address handler) { - if (test_address(addr) == handler) return true; - if (count() < cache_size) { - set_pc_at(count(),addr); - set_handler_at(count(), handler); - increment_count(); - return true; - } - return false; -} - - -// private method for handling exception cache -// These methods are private, and used to manipulate the exception cache -// directly. -ExceptionCache* nmethod::exception_cache_entry_for_exception(Handle exception) { - ExceptionCache* ec = exception_cache(); - while (ec != NULL) { - if (ec->match_exception_with_space(exception)) { - return ec; - } - ec = ec->next(); - } - return NULL; -} - - -//----------------------------------------------------------------------------- - - -// Helper used by both find_pc_desc methods. -static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) { - NOT_PRODUCT(++nmethod_stats.pc_desc_tests); - if (!approximate) - return pc->pc_offset() == pc_offset; - else - return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset(); -} - -void PcDescCache::reset_to(PcDesc* initial_pc_desc) { - if (initial_pc_desc == NULL) { - _pc_descs[0] = NULL; // native method; no PcDescs at all - return; - } - NOT_PRODUCT(++nmethod_stats.pc_desc_resets); - // reset the cache by filling it with benign (non-null) values - assert(initial_pc_desc->pc_offset() < 0, "must be sentinel"); - for (int i = 0; i < cache_size; i++) - _pc_descs[i] = initial_pc_desc; -} - -PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) { - NOT_PRODUCT(++nmethod_stats.pc_desc_queries); - NOT_PRODUCT(if (approximate) ++nmethod_stats.pc_desc_approx); - - // Note: one might think that caching the most recently - // read value separately would be a win, but one would be - // wrong. When many threads are updating it, the cache - // line it's in would bounce between caches, negating - // any benefit. - - // In order to prevent race conditions do not load cache elements - // repeatedly, but use a local copy: - PcDesc* res; - - // Step one: Check the most recently added value. - res = _pc_descs[0]; - if (res == NULL) return NULL; // native method; no PcDescs at all - if (match_desc(res, pc_offset, approximate)) { - NOT_PRODUCT(++nmethod_stats.pc_desc_repeats); - return res; - } - - // Step two: Check the rest of the LRU cache. - for (int i = 1; i < cache_size; ++i) { - res = _pc_descs[i]; - if (res->pc_offset() < 0) break; // optimization: skip empty cache - if (match_desc(res, pc_offset, approximate)) { - NOT_PRODUCT(++nmethod_stats.pc_desc_hits); - return res; - } - } - - // Report failure. - return NULL; -} - -void PcDescCache::add_pc_desc(PcDesc* pc_desc) { - NOT_PRODUCT(++nmethod_stats.pc_desc_adds); - // Update the LRU cache by shifting pc_desc forward. - for (int i = 0; i < cache_size; i++) { - PcDesc* next = _pc_descs[i]; - _pc_descs[i] = pc_desc; - pc_desc = next; - } -} - -// adjust pcs_size so that it is a multiple of both oopSize and -// sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple -// of oopSize, then 2*sizeof(PcDesc) is) -static int adjust_pcs_size(int pcs_size) { - int nsize = round_to(pcs_size, oopSize); - if ((nsize % sizeof(PcDesc)) != 0) { - nsize = pcs_size + sizeof(PcDesc); - } - assert((nsize % oopSize) == 0, "correct alignment"); - return nsize; -} - -//----------------------------------------------------------------------------- - - -void nmethod::add_exception_cache_entry(ExceptionCache* new_entry) { - assert(ExceptionCache_lock->owned_by_self(),"Must hold the ExceptionCache_lock"); - assert(new_entry != NULL,"Must be non null"); - assert(new_entry->next() == NULL, "Must be null"); - - if (exception_cache() != NULL) { - new_entry->set_next(exception_cache()); - } - set_exception_cache(new_entry); -} - -void nmethod::remove_from_exception_cache(ExceptionCache* ec) { - ExceptionCache* prev = NULL; - ExceptionCache* curr = exception_cache(); - assert(curr != NULL, "nothing to remove"); - // find the previous and next entry of ec - while (curr != ec) { - prev = curr; - curr = curr->next(); - assert(curr != NULL, "ExceptionCache not found"); - } - // now: curr == ec - ExceptionCache* next = curr->next(); - if (prev == NULL) { - set_exception_cache(next); - } else { - prev->set_next(next); - } - delete curr; -} - - -// public method for accessing the exception cache -// These are the public access methods. -address nmethod::handler_for_exception_and_pc(Handle exception, address pc) { - // We never grab a lock to read the exception cache, so we may - // have false negatives. This is okay, as it can only happen during - // the first few exception lookups for a given nmethod. - ExceptionCache* ec = exception_cache(); - while (ec != NULL) { - address ret_val; - if ((ret_val = ec->match(exception,pc)) != NULL) { - return ret_val; - } - ec = ec->next(); - } - return NULL; -} - - -void nmethod::add_handler_for_exception_and_pc(Handle exception, address pc, address handler) { - // There are potential race conditions during exception cache updates, so we - // must own the ExceptionCache_lock before doing ANY modifications. Because - // we don't lock during reads, it is possible to have several threads attempt - // to update the cache with the same data. We need to check for already inserted - // copies of the current data before adding it. - - MutexLocker ml(ExceptionCache_lock); - ExceptionCache* target_entry = exception_cache_entry_for_exception(exception); - - if (target_entry == NULL || !target_entry->add_address_and_handler(pc,handler)) { - target_entry = new ExceptionCache(exception,pc,handler); - add_exception_cache_entry(target_entry); - } -} - - -//-------------end of code for ExceptionCache-------------- - - -int nmethod::total_size() const { - return - consts_size() + - insts_size() + - stub_size() + - scopes_data_size() + - scopes_pcs_size() + - handler_table_size() + - nul_chk_table_size(); -} - -const char* nmethod::compile_kind() const { - if (is_osr_method()) return "osr"; - if (method() != NULL && is_native_method()) return "c2n"; - return NULL; -} - -// Fill in default values for various flag fields -void nmethod::init_defaults() { - _state = alive; - _marked_for_reclamation = 0; - _has_flushed_dependencies = 0; - _speculatively_disconnected = 0; - _has_unsafe_access = 0; - _has_method_handle_invokes = 0; - _lazy_critical_native = 0; - _marked_for_deoptimization = 0; - _lock_count = 0; - _stack_traversal_mark = 0; - _unload_reported = false; // jvmti state - -#ifdef ASSERT - _oops_are_stale = false; -#endif - - _oops_do_mark_link = NULL; - _jmethod_id = NULL; - _osr_link = NULL; - _scavenge_root_link = NULL; - _scavenge_root_state = 0; - _saved_nmethod_link = NULL; - _compiler = NULL; - - _graal_compiled_method = NULL; - -#ifdef HAVE_DTRACE_H - _trap_offset = 0; -#endif // def HAVE_DTRACE_H -} - - -nmethod* nmethod::new_native_nmethod(methodHandle method, - int compile_id, - CodeBuffer *code_buffer, - int vep_offset, - int frame_complete, - int frame_size, - ByteSize basic_lock_owner_sp_offset, - ByteSize basic_lock_sp_offset, - OopMapSet* oop_maps) { - // create nmethod - nmethod* nm = NULL; - { - MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); - int native_nmethod_size = allocation_size(code_buffer, sizeof(nmethod)); - CodeOffsets offsets; - offsets.set_value(CodeOffsets::Verified_Entry, vep_offset); - offsets.set_value(CodeOffsets::Frame_Complete, frame_complete); - nm = new (native_nmethod_size) - nmethod(method(), native_nmethod_size, compile_id, &offsets, - code_buffer, frame_size, - basic_lock_owner_sp_offset, basic_lock_sp_offset, - oop_maps); - if (nm != NULL) nmethod_stats.note_native_nmethod(nm); - if (PrintAssembly && nm != NULL) - Disassembler::decode(nm); - +/* + * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. + * + * This code is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA + * or visit www.oracle.com if you need additional information or have any + * questions. + * + */ + +#include "precompiled.hpp" +#include "code/codeCache.hpp" +#include "code/compiledIC.hpp" +#include "code/dependencies.hpp" +#include "code/nmethod.hpp" +#include "code/scopeDesc.hpp" +#include "compiler/abstractCompiler.hpp" +#include "compiler/compileBroker.hpp" +#include "compiler/compileLog.hpp" +#include "compiler/compilerOracle.hpp" +#include "compiler/disassembler.hpp" +#include "interpreter/bytecode.hpp" +#include "oops/methodData.hpp" +#include "prims/jvmtiRedefineClassesTrace.hpp" +#include "prims/jvmtiImpl.hpp" +#include "runtime/sharedRuntime.hpp" +#include "runtime/sweeper.hpp" +#include "utilities/dtrace.hpp" +#include "utilities/events.hpp" +#include "utilities/xmlstream.hpp" +#include "utilities/debug.hpp" +#include "utilities/machineCodePrinter.hpp" +#ifdef SHARK +#include "shark/sharkCompiler.hpp" +#endif +#ifdef GRAAL +#include "graal/graalJavaAccess.hpp" +#endif + +#ifdef DTRACE_ENABLED + +// Only bother with this argument setup if dtrace is available + +#ifndef USDT2 +HS_DTRACE_PROBE_DECL8(hotspot, compiled__method__load, + const char*, int, const char*, int, const char*, int, void*, size_t); + +HS_DTRACE_PROBE_DECL6(hotspot, compiled__method__unload, + char*, int, char*, int, char*, int); + +#define DTRACE_METHOD_UNLOAD_PROBE(method) \ + { \ + Method* m = (method); \ + if (m != NULL) { \ + Symbol* klass_name = m->klass_name(); \ + Symbol* name = m->name(); \ + Symbol* signature = m->signature(); \ + HS_DTRACE_PROBE6(hotspot, compiled__method__unload, \ + klass_name->bytes(), klass_name->utf8_length(), \ + name->bytes(), name->utf8_length(), \ + signature->bytes(), signature->utf8_length()); \ + } \ + } +#else /* USDT2 */ +#define DTRACE_METHOD_UNLOAD_PROBE(method) \ + { \ + Method* m = (method); \ + if (m != NULL) { \ + Symbol* klass_name = m->klass_name(); \ + Symbol* name = m->name(); \ + Symbol* signature = m->signature(); \ + HOTSPOT_COMPILED_METHOD_UNLOAD( \ + (char *) klass_name->bytes(), klass_name->utf8_length(), \ + (char *) name->bytes(), name->utf8_length(), \ + (char *) signature->bytes(), signature->utf8_length()); \ + } \ + } +#endif /* USDT2 */ + +#else // ndef DTRACE_ENABLED + +#define DTRACE_METHOD_UNLOAD_PROBE(method) + +#endif + +bool nmethod::is_compiled_by_c1() const { + if (compiler() == NULL || method() == NULL) return false; // can happen during debug printing + if (is_native_method()) return false; + return compiler()->is_c1(); +} +bool nmethod::is_compiled_by_c2() const { + if (compiler() == NULL || method() == NULL) return false; // can happen during debug printing + if (is_native_method()) return false; + return compiler()->is_c2(); +} +bool nmethod::is_compiled_by_shark() const { + if (is_native_method()) return false; + assert(compiler() != NULL, "must be"); + return compiler()->is_shark(); +} + + + +//--------------------------------------------------------------------------------- +// NMethod statistics +// They are printed under various flags, including: +// PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation. +// (In the latter two cases, they like other stats are printed to the log only.) + +// These variables are put into one block to reduce relocations +// and make it simpler to print from the debugger. +static +struct nmethod_stats_struct { + int nmethod_count; + int total_size; + int relocation_size; + int consts_size; + int insts_size; + int stub_size; + int scopes_data_size; + int scopes_pcs_size; + int dependencies_size; + int handler_table_size; + int nul_chk_table_size; + int oops_size; + + void note_nmethod(nmethod* nm) { + nmethod_count += 1; + total_size += nm->size(); + relocation_size += nm->relocation_size(); + consts_size += nm->consts_size(); + insts_size += nm->insts_size(); + stub_size += nm->stub_size(); + oops_size += nm->oops_size(); + scopes_data_size += nm->scopes_data_size(); + scopes_pcs_size += nm->scopes_pcs_size(); + dependencies_size += nm->dependencies_size(); + handler_table_size += nm->handler_table_size(); + nul_chk_table_size += nm->nul_chk_table_size(); + } + void print_nmethod_stats() { + if (nmethod_count == 0) return; + tty->print_cr("Statistics for %d bytecoded nmethods:", nmethod_count); + if (total_size != 0) tty->print_cr(" total in heap = %d", total_size); + if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size); + if (consts_size != 0) tty->print_cr(" constants = %d", consts_size); + if (insts_size != 0) tty->print_cr(" main code = %d", insts_size); + if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size); + if (oops_size != 0) tty->print_cr(" oops = %d", oops_size); + if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size); + if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size); + if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size); + if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size); + if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size); + } + + int native_nmethod_count; + int native_total_size; + int native_relocation_size; + int native_insts_size; + int native_oops_size; + void note_native_nmethod(nmethod* nm) { + native_nmethod_count += 1; + native_total_size += nm->size(); + native_relocation_size += nm->relocation_size(); + native_insts_size += nm->insts_size(); + native_oops_size += nm->oops_size(); + } + void print_native_nmethod_stats() { + if (native_nmethod_count == 0) return; + tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count); + if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size); + if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size); + if (native_insts_size != 0) tty->print_cr(" N. main code = %d", native_insts_size); + if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size); + } + + int pc_desc_resets; // number of resets (= number of caches) + int pc_desc_queries; // queries to nmethod::find_pc_desc + int pc_desc_approx; // number of those which have approximate true + int pc_desc_repeats; // number of _pc_descs[0] hits + int pc_desc_hits; // number of LRU cache hits + int pc_desc_tests; // total number of PcDesc examinations + int pc_desc_searches; // total number of quasi-binary search steps + int pc_desc_adds; // number of LUR cache insertions + + void print_pc_stats() { + tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query", + pc_desc_queries, + (double)(pc_desc_tests + pc_desc_searches) + / pc_desc_queries); + tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d", + pc_desc_resets, + pc_desc_queries, pc_desc_approx, + pc_desc_repeats, pc_desc_hits, + pc_desc_tests, pc_desc_searches, pc_desc_adds); + } +} nmethod_stats; + + +//--------------------------------------------------------------------------------- + + +ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) { + assert(pc != NULL, "Must be non null"); + assert(exception.not_null(), "Must be non null"); + assert(handler != NULL, "Must be non null"); + + _count = 0; + _exception_type = exception->klass(); + _next = NULL; + + add_address_and_handler(pc,handler); +} + + +address ExceptionCache::match(Handle exception, address pc) { + assert(pc != NULL,"Must be non null"); + assert(exception.not_null(),"Must be non null"); + if (exception->klass() == exception_type()) { + return (test_address(pc)); + } + + return NULL; +} + + +bool ExceptionCache::match_exception_with_space(Handle exception) { + assert(exception.not_null(),"Must be non null"); + if (exception->klass() == exception_type() && count() < cache_size) { + return true; + } + return false; +} + + +address ExceptionCache::test_address(address addr) { + for (int i=0; i<count(); i++) { + if (pc_at(i) == addr) { + return handler_at(i); + } + } + return NULL; +} + + +bool ExceptionCache::add_address_and_handler(address addr, address handler) { + if (test_address(addr) == handler) return true; + if (count() < cache_size) { + set_pc_at(count(),addr); + set_handler_at(count(), handler); + increment_count(); + return true; + } + return false; +} + + +// private method for handling exception cache +// These methods are private, and used to manipulate the exception cache +// directly. +ExceptionCache* nmethod::exception_cache_entry_for_exception(Handle exception) { + ExceptionCache* ec = exception_cache(); + while (ec != NULL) { + if (ec->match_exception_with_space(exception)) { + return ec; + } + ec = ec->next(); + } + return NULL; +} + + +//----------------------------------------------------------------------------- + + +// Helper used by both find_pc_desc methods. +static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) { + NOT_PRODUCT(++nmethod_stats.pc_desc_tests); + if (!approximate) + return pc->pc_offset() == pc_offset; + else + return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset(); +} + +void PcDescCache::reset_to(PcDesc* initial_pc_desc) { + if (initial_pc_desc == NULL) { + _pc_descs[0] = NULL; // native method; no PcDescs at all + return; + } + NOT_PRODUCT(++nmethod_stats.pc_desc_resets); + // reset the cache by filling it with benign (non-null) values + assert(initial_pc_desc->pc_offset() < 0, "must be sentinel"); + for (int i = 0; i < cache_size; i++) + _pc_descs[i] = initial_pc_desc; +} + +PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) { + NOT_PRODUCT(++nmethod_stats.pc_desc_queries); + NOT_PRODUCT(if (approximate) ++nmethod_stats.pc_desc_approx); + + // Note: one might think that caching the most recently + // read value separately would be a win, but one would be + // wrong. When many threads are updating it, the cache + // line it's in would bounce between caches, negating + // any benefit. + + // In order to prevent race conditions do not load cache elements + // repeatedly, but use a local copy: + PcDesc* res; + + // Step one: Check the most recently added value. + res = _pc_descs[0]; + if (res == NULL) return NULL; // native method; no PcDescs at all + if (match_desc(res, pc_offset, approximate)) { + NOT_PRODUCT(++nmethod_stats.pc_desc_repeats); + return res; + } + + // Step two: Check the rest of the LRU cache. + for (int i = 1; i < cache_size; ++i) { + res = _pc_descs[i]; + if (res->pc_offset() < 0) break; // optimization: skip empty cache + if (match_desc(res, pc_offset, approximate)) { + NOT_PRODUCT(++nmethod_stats.pc_desc_hits); + return res; + } + } + + // Report failure. + return NULL; +} + +void PcDescCache::add_pc_desc(PcDesc* pc_desc) { + NOT_PRODUCT(++nmethod_stats.pc_desc_adds); + // Update the LRU cache by shifting pc_desc forward. + for (int i = 0; i < cache_size; i++) { + PcDesc* next = _pc_descs[i]; + _pc_descs[i] = pc_desc; + pc_desc = next; + } +} + +// adjust pcs_size so that it is a multiple of both oopSize and +// sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple +// of oopSize, then 2*sizeof(PcDesc) is) +static int adjust_pcs_size(int pcs_size) { + int nsize = round_to(pcs_size, oopSize); + if ((nsize % sizeof(PcDesc)) != 0) { + nsize = pcs_size + sizeof(PcDesc); + } + assert((nsize % oopSize) == 0, "correct alignment"); + return nsize; +} + +//----------------------------------------------------------------------------- + + +void nmethod::add_exception_cache_entry(ExceptionCache* new_entry) { + assert(ExceptionCache_lock->owned_by_self(),"Must hold the ExceptionCache_lock"); + assert(new_entry != NULL,"Must be non null"); + assert(new_entry->next() == NULL, "Must be null"); + + if (exception_cache() != NULL) { + new_entry->set_next(exception_cache()); + } + set_exception_cache(new_entry); +} + +void nmethod::remove_from_exception_cache(ExceptionCache* ec) { + ExceptionCache* prev = NULL; + ExceptionCache* curr = exception_cache(); + assert(curr != NULL, "nothing to remove"); + // find the previous and next entry of ec + while (curr != ec) { + prev = curr; + curr = curr->next(); + assert(curr != NULL, "ExceptionCache not found"); + } + // now: curr == ec + ExceptionCache* next = curr->next(); + if (prev == NULL) { + set_exception_cache(next); + } else { + prev->set_next(next); + } + delete curr; +} + + +// public method for accessing the exception cache +// These are the public access methods. +address nmethod::handler_for_exception_and_pc(Handle exception, address pc) { + // We never grab a lock to read the exception cache, so we may + // have false negatives. This is okay, as it can only happen during + // the first few exception lookups for a given nmethod. + ExceptionCache* ec = exception_cache(); + while (ec != NULL) { + address ret_val; + if ((ret_val = ec->match(exception,pc)) != NULL) { + return ret_val; + } + ec = ec->next(); + } + return NULL; +} + + +void nmethod::add_handler_for_exception_and_pc(Handle exception, address pc, address handler) { + // There are potential race conditions during exception cache updates, so we + // must own the ExceptionCache_lock before doing ANY modifications. Because + // we don't lock during reads, it is possible to have several threads attempt + // to update the cache with the same data. We need to check for already inserted + // copies of the current data before adding it. + + MutexLocker ml(ExceptionCache_lock); + ExceptionCache* target_entry = exception_cache_entry_for_exception(exception); + + if (target_entry == NULL || !target_entry->add_address_and_handler(pc,handler)) { + target_entry = new ExceptionCache(exception,pc,handler); + add_exception_cache_entry(target_entry); + } +} + + +//-------------end of code for ExceptionCache-------------- + + +int nmethod::total_size() const { + return + consts_size() + + insts_size() + + stub_size() + + scopes_data_size() + + scopes_pcs_size() + + handler_table_size() + + nul_chk_table_size(); +} + +const char* nmethod::compile_kind() const { + if (is_osr_method()) return "osr"; + if (method() != NULL && is_native_method()) return "c2n"; + return NULL; +} + +// Fill in default values for various flag fields +void nmethod::init_defaults() { + _state = alive; + _marked_for_reclamation = 0; + _has_flushed_dependencies = 0; + _speculatively_disconnected = 0; + _has_unsafe_access = 0; + _has_method_handle_invokes = 0; + _lazy_critical_native = 0; + _has_wide_vectors = 0; + _marked_for_deoptimization = 0; + _lock_count = 0; + _stack_traversal_mark = 0; + _unload_reported = false; // jvmti state + +#ifdef ASSERT + _oops_are_stale = false; +#endif + + _oops_do_mark_link = NULL; + _jmethod_id = NULL; + _osr_link = NULL; + _scavenge_root_link = NULL; + _scavenge_root_state = 0; + _saved_nmethod_link = NULL; + _compiler = NULL; +#ifdef GRAAL + _graal_installed_code = NULL; +#endif +#ifdef HAVE_DTRACE_H + _trap_offset = 0; +#endif // def HAVE_DTRACE_H +} + + +nmethod* nmethod::new_native_nmethod(methodHandle method, + int compile_id, + CodeBuffer *code_buffer, + int vep_offset, + int frame_complete, + int frame_size, + ByteSize basic_lock_owner_sp_offset, + ByteSize basic_lock_sp_offset, + OopMapSet* oop_maps) { + code_buffer->finalize_oop_references(method); + // create nmethod + nmethod* nm = NULL; + { + MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); + int native_nmethod_size = allocation_size(code_buffer, sizeof(nmethod)); + CodeOffsets offsets; + offsets.set_value(CodeOffsets::Verified_Entry, vep_offset); + offsets.set_value(CodeOffsets::Frame_Complete, frame_complete); + nm = new (native_nmethod_size) + nmethod(method(), native_nmethod_size, compile_id, &offsets, + code_buffer, frame_size, + basic_lock_owner_sp_offset, basic_lock_sp_offset, + oop_maps); + if (nm != NULL) nmethod_stats.note_native_nmethod(nm); + if (PrintAssembly && nm != NULL) + Disassembler::decode(nm); + if (PrintMachineCodeToFile) { MachineCodePrinter::print(nm); - } - } - // verify nmethod - debug_only(if (nm) nm->verify();) // might block - - if (nm != NULL) { - nm->log_new_nmethod(); - } - - return nm; -} - -#ifdef HAVE_DTRACE_H -nmethod* nmethod::new_dtrace_nmethod(methodHandle method, - CodeBuffer *code_buffer, - int vep_offset, - int trap_offset, - int frame_complete, - int frame_size) { - // create nmethod - nmethod* nm = NULL; - { - MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); - int nmethod_size = allocation_size(code_buffer, sizeof(nmethod)); - CodeOffsets offsets; - offsets.set_value(CodeOffsets::Verified_Entry, vep_offset); - offsets.set_value(CodeOffsets::Dtrace_trap, trap_offset); - offsets.set_value(CodeOffsets::Frame_Complete, frame_complete); - - nm = new (nmethod_size) nmethod(method(), nmethod_size, &offsets, code_buffer, frame_size); - - if (nm != NULL) nmethod_stats.note_nmethod(nm); - if (PrintAssembly && nm != NULL) - Disassembler::decode(nm); - } - // verify nmethod - debug_only(if (nm) nm->verify();) // might block - - if (nm != NULL) { - nm->log_new_nmethod(); - } - - return nm; -} - -#endif // def HAVE_DTRACE_H - -nmethod* nmethod::new_nmethod(methodHandle method, - int compile_id, - int entry_bci, - CodeOffsets* offsets, - int orig_pc_offset, - DebugInformationRecorder* debug_info, - Dependencies* dependencies, - CodeBuffer* code_buffer, int frame_size, - OopMapSet* oop_maps, - ExceptionHandlerTable* handler_table, - ImplicitExceptionTable* nul_chk_table, - AbstractCompiler* compiler, - int comp_level -) -{ - assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR"); - // create nmethod - nmethod* nm = NULL; - { MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); - int nmethod_size = - allocation_size(code_buffer, sizeof(nmethod)) - + adjust_pcs_size(debug_info->pcs_size()) - + round_to(dependencies->size_in_bytes() , oopSize) - + round_to(handler_table->size_in_bytes(), oopSize) - + round_to(nul_chk_table->size_in_bytes(), oopSize) - + round_to(debug_info->data_size() , oopSize); - nm = new (nmethod_size) - nmethod(method(), nmethod_size, compile_id, entry_bci, offsets, - orig_pc_offset, debug_info, dependencies, code_buffer, frame_size, - oop_maps, - handler_table, - nul_chk_table, - compiler, - comp_level); - if (nm != NULL) { - // To make dependency checking during class loading fast, record - // the nmethod dependencies in the classes it is dependent on. - // This allows the dependency checking code to simply walk the - // class hierarchy above the loaded class, checking only nmethods - // which are dependent on those classes. The slow way is to - // check every nmethod for dependencies which makes it linear in - // the number of methods compiled. For applications with a lot - // classes the slow way is too slow. - for (Dependencies::DepStream deps(nm); deps.next(); ) { - klassOop klass = deps.context_type(); - if (klass == NULL) continue; // ignore things like evol_method - - // record this nmethod as dependent on this klass - instanceKlass::cast(klass)->add_dependent_nmethod(nm); - } - } - if (nm != NULL) nmethod_stats.note_nmethod(nm); - if (PrintAssembly && nm != NULL) - Disassembler::decode(nm); - + } + } + // verify nmethod + debug_only(if (nm) nm->verify();) // might block + + if (nm != NULL) { + nm->log_new_nmethod(); + } + + return nm; +} + +#ifdef HAVE_DTRACE_H +nmethod* nmethod::new_dtrace_nmethod(methodHandle method, + CodeBuffer *code_buffer, + int vep_offset, + int trap_offset, + int frame_complete, + int frame_size) { + code_buffer->finalize_oop_references(method); + // create nmethod + nmethod* nm = NULL; + { + MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); + int nmethod_size = allocation_size(code_buffer, sizeof(nmethod)); + CodeOffsets offsets; + offsets.set_value(CodeOffsets::Verified_Entry, vep_offset); + offsets.set_value(CodeOffsets::Dtrace_trap, trap_offset); + offsets.set_value(CodeOffsets::Frame_Complete, frame_complete); + + nm = new (nmethod_size) nmethod(method(), nmethod_size, &offsets, code_buffer, frame_size); + + if (nm != NULL) nmethod_stats.note_nmethod(nm); + if (PrintAssembly && nm != NULL) + Disassembler::decode(nm); + } + // verify nmethod + debug_only(if (nm) nm->verify();) // might block + + if (nm != NULL) { + nm->log_new_nmethod(); + } + + return nm; +} + +#endif // def HAVE_DTRACE_H + +nmethod* nmethod::new_nmethod(methodHandle method, + int compile_id, + int entry_bci, + CodeOffsets* offsets, + int orig_pc_offset, + DebugInformationRecorder* debug_info, + Dependencies* dependencies, + CodeBuffer* code_buffer, int frame_size, + OopMapSet* oop_maps, + ExceptionHandlerTable* handler_table, + ImplicitExceptionTable* nul_chk_table, + AbstractCompiler* compiler, + int comp_level +#ifdef GRAAL + , Handle installed_code +#endif +) +{ + assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR"); + code_buffer->finalize_oop_references(method); + // create nmethod + nmethod* nm = NULL; + { MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); + int nmethod_size = + allocation_size(code_buffer, sizeof(nmethod)) + + adjust_pcs_size(debug_info->pcs_size()) + + round_to(dependencies->size_in_bytes() , oopSize) + + round_to(handler_table->size_in_bytes(), oopSize) + + round_to(nul_chk_table->size_in_bytes(), oopSize) + + round_to(debug_info->data_size() , oopSize); + nm = new (nmethod_size) + nmethod(method(), nmethod_size, compile_id, entry_bci, offsets, + orig_pc_offset, debug_info, dependencies, code_buffer, frame_size, + oop_maps, + handler_table, + nul_chk_table, + compiler, + comp_level +#ifdef GRAAL + , installed_code +#endif + ); + if (nm != NULL) { + // To make dependency checking during class loading fast, record + // the nmethod dependencies in the classes it is dependent on. + // This allows the dependency checking code to simply walk the + // class hierarchy above the loaded class, checking only nmethods + // which are dependent on those classes. The slow way is to + // check every nmethod for dependencies which makes it linear in + // the number of methods compiled. For applications with a lot + // classes the slow way is too slow. + for (Dependencies::DepStream deps(nm); deps.next(); ) { + Klass* klass = deps.context_type(); + if (klass == NULL) continue; // ignore things like evol_method + + // record this nmethod as dependent on this klass + InstanceKlass::cast(klass)->add_dependent_nmethod(nm); + } + } + if (nm != NULL) nmethod_stats.note_nmethod(nm); + if (PrintAssembly && nm != NULL) + Disassembler::decode(nm); + if (PrintMachineCodeToFile) { MachineCodePrinter::print(nm); - } - } - - // verify nmethod - debug_only(if (nm) nm->verify();) // might block - - if (nm != NULL) { - nm->log_new_nmethod(); - } - - // done - return nm; -} - - -// For native wrappers -nmethod::nmethod( - methodOop method, - int nmethod_size, - int compile_id, - CodeOffsets* offsets, - CodeBuffer* code_buffer, - int frame_size, - ByteSize basic_lock_owner_sp_offset, - ByteSize basic_lock_sp_offset, - OopMapSet* oop_maps ) - : CodeBlob("native nmethod", code_buffer, sizeof(nmethod), - nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps), - _native_receiver_sp_offset(basic_lock_owner_sp_offset), - _native_basic_lock_sp_offset(basic_lock_sp_offset) -{ - { - debug_only(No_Safepoint_Verifier nsv;) - assert_locked_or_safepoint(CodeCache_lock); - - init_defaults(); - _method = method; - _entry_bci = InvocationEntryBci; - // We have no exception handler or deopt handler make the - // values something that will never match a pc like the nmethod vtable entry - _exception_offset = 0; - _deoptimize_offset = 0; - _deoptimize_mh_offset = 0; - _orig_pc_offset = 0; - - _consts_offset = data_offset(); - _stub_offset = data_offset(); - _oops_offset = data_offset(); - _scopes_data_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize); - _scopes_pcs_offset = _scopes_data_offset; - _dependencies_offset = _scopes_pcs_offset; - _handler_table_offset = _dependencies_offset; - _nul_chk_table_offset = _handler_table_offset; - _nmethod_end_offset = _nul_chk_table_offset; - _compile_id = compile_id; - _comp_level = CompLevel_none; - _entry_point = code_begin() + offsets->value(CodeOffsets::Entry); - _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry); - _osr_entry_point = NULL; - _exception_cache = NULL; - _pc_desc_cache.reset_to(NULL); - - code_buffer->copy_oops_to(this); - if (ScavengeRootsInCode && detect_scavenge_root_oops()) { - CodeCache::add_scavenge_root_nmethod(this); - } - debug_only(verify_scavenge_root_oops()); - CodeCache::commit(this); - } - - if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) { - ttyLocker ttyl; // keep the following output all in one block - // This output goes directly to the tty, not the compiler log. - // To enable tools to match it up with the compilation activity, - // be sure to tag this tty output with the compile ID. - if (xtty != NULL) { - xtty->begin_head("print_native_nmethod"); - xtty->method(_method); - xtty->stamp(); - xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this); - } - // print the header part first - print(); - // then print the requested information - if (PrintNativeNMethods) { - print_code(); - oop_maps->print(); - } - if (PrintRelocations) { - print_relocations(); - } - if (xtty != NULL) { - xtty->tail("print_native_nmethod"); - } - } -} - -// For dtrace wrappers -#ifdef HAVE_DTRACE_H -nmethod::nmethod( - methodOop method, - int nmethod_size, - CodeOffsets* offsets, - CodeBuffer* code_buffer, - int frame_size) - : CodeBlob("dtrace nmethod", code_buffer, sizeof(nmethod), - nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, NULL), - _native_receiver_sp_offset(in_ByteSize(-1)), - _native_basic_lock_sp_offset(in_ByteSize(-1)) -{ - { - debug_only(No_Safepoint_Verifier nsv;) - assert_locked_or_safepoint(CodeCache_lock); - - init_defaults(); - _method = method; - _entry_bci = InvocationEntryBci; - // We have no exception handler or deopt handler make the - // values something that will never match a pc like the nmethod vtable entry - _exception_offset = 0; - _deoptimize_offset = 0; - _deoptimize_mh_offset = 0; - _unwind_handler_offset = -1; - _trap_offset = offsets->value(CodeOffsets::Dtrace_trap); - _orig_pc_offset = 0; - _consts_offset = data_offset(); - _stub_offset = data_offset(); - _oops_offset = data_offset(); - _scopes_data_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize); - _scopes_pcs_offset = _scopes_data_offset; - _dependencies_offset = _scopes_pcs_offset; - _handler_table_offset = _dependencies_offset; - _nul_chk_table_offset = _handler_table_offset; - _nmethod_end_offset = _nul_chk_table_offset; - _compile_id = 0; // default - _comp_level = CompLevel_none; - _entry_point = code_begin() + offsets->value(CodeOffsets::Entry); - _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry); - _osr_entry_point = NULL; - _exception_cache = NULL; - _pc_desc_cache.reset_to(NULL); - - code_buffer->copy_oops_to(this); - debug_only(verify_scavenge_root_oops()); - CodeCache::commit(this); - } - - if (PrintNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) { - ttyLocker ttyl; // keep the following output all in one block - // This output goes directly to the tty, not the compiler log. - // To enable tools to match it up with the compilation activity, - // be sure to tag this tty output with the compile ID. - if (xtty != NULL) { - xtty->begin_head("print_dtrace_nmethod"); - xtty->method(_method); - xtty->stamp(); - xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this); - } - // print the header part first - print(); - // then print the requested information - if (PrintNMethods) { - print_code(); - } - if (PrintRelocations) { - print_relocations(); - } - if (xtty != NULL) { - xtty->tail("print_dtrace_nmethod"); - } - } -} -#endif // def HAVE_DTRACE_H - -void* nmethod::operator new(size_t size, int nmethod_size) { - // Always leave some room in the CodeCache for I2C/C2I adapters - if (CodeCache::largest_free_block() < CodeCacheMinimumFreeSpace) return NULL; - return CodeCache::allocate(nmethod_size); -} - - -nmethod::nmethod( - methodOop method, - int nmethod_size, - int compile_id, - int entry_bci, - CodeOffsets* offsets, - int orig_pc_offset, - DebugInformationRecorder* debug_info, - Dependencies* dependencies, - CodeBuffer *code_buffer, - int frame_size, - OopMapSet* oop_maps, - ExceptionHandlerTable* handler_table, - ImplicitExceptionTable* nul_chk_table, - AbstractCompiler* compiler, - int comp_level - ) - : CodeBlob("nmethod", code_buffer, sizeof(nmethod), - nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps), - _native_receiver_sp_offset(in_ByteSize(-1)), - _native_basic_lock_sp_offset(in_ByteSize(-1)) -{ - assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR"); - { - debug_only(No_Safepoint_Verifier nsv;) - assert_locked_or_safepoint(CodeCache_lock); - - init_defaults(); - _method = method; - _entry_bci = entry_bci; - _compile_id = compile_id; - _comp_level = comp_level; - _compiler = compiler; - _orig_pc_offset = orig_pc_offset; - - // Section offsets - _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts()); - _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs()); - -#ifdef GRAAL - // graal produces no (!) stub section - if (offsets->value(CodeOffsets::Exceptions) != -1) { - _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions); - } else { - _exception_offset = -1; - } - if (offsets->value(CodeOffsets::Deopt) != -1) { - _deoptimize_offset = code_offset() + offsets->value(CodeOffsets::Deopt); - } else { - _deoptimize_offset = -1; - } - if (offsets->value(CodeOffsets::DeoptMH) != -1) { - _deoptimize_mh_offset = code_offset() + offsets->value(CodeOffsets::DeoptMH); - } else { - _deoptimize_mh_offset = -1; - } -#else - // Exception handler and deopt handler are in the stub section - assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set"); - assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set"); - - _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions); - _deoptimize_offset = _stub_offset + offsets->value(CodeOffsets::Deopt); - if (offsets->value(CodeOffsets::DeoptMH) != -1) { - _deoptimize_mh_offset = _stub_offset + offsets->value(CodeOffsets::DeoptMH); - } else { - _deoptimize_mh_offset = -1; - } -#endif - if (offsets->value(CodeOffsets::UnwindHandler) != -1) { - _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler); - } else { - _unwind_handler_offset = -1; - } - - _oops_offset = data_offset(); - _scopes_data_offset = _oops_offset + round_to(code_buffer->total_oop_size (), oopSize); - _scopes_pcs_offset = _scopes_data_offset + round_to(debug_info->data_size (), oopSize); - _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size()); - _handler_table_offset = _dependencies_offset + round_to(dependencies->size_in_bytes (), oopSize); - _nul_chk_table_offset = _handler_table_offset + round_to(handler_table->size_in_bytes(), oopSize); - _nmethod_end_offset = _nul_chk_table_offset + round_to(nul_chk_table->size_in_bytes(), oopSize); - - _entry_point = code_begin() + offsets->value(CodeOffsets::Entry); - _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry); - _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry); - _exception_cache = NULL; - _pc_desc_cache.reset_to(scopes_pcs_begin()); - - // Copy contents of ScopeDescRecorder to nmethod - code_buffer->copy_oops_to(this); - debug_info->copy_to(this); - dependencies->copy_to(this); - if (ScavengeRootsInCode && detect_scavenge_root_oops()) { - CodeCache::add_scavenge_root_nmethod(this); - } - debug_only(verify_scavenge_root_oops()); - - CodeCache::commit(this); - - // Copy contents of ExceptionHandlerTable to nmethod - handler_table->copy_to(this); - nul_chk_table->copy_to(this); - - // we use the information of entry points to find out if a method is - // static or non static - assert(compiler->is_c2() || - _method->is_static() == (entry_point() == _verified_entry_point), - " entry points must be same for static methods and vice versa"); - } - - bool printnmethods = PrintNMethods - || CompilerOracle::should_print(_method) - || CompilerOracle::has_option_string(_method, "PrintNMethods"); - if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) { - print_nmethod(printnmethods); - } -} - - -// Print a short set of xml attributes to identify this nmethod. The -// output should be embedded in some other element. -void nmethod::log_identity(xmlStream* log) const { - log->print(" compile_id='%d'", compile_id()); - const char* nm_kind = compile_kind(); - if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind); - if (compiler() != NULL) { - log->print(" compiler='%s'", compiler()->name()); - } - if (TieredCompilation) { - log->print(" level='%d'", comp_level()); - } -} - - -#define LOG_OFFSET(log, name) \ - if ((intptr_t)name##_end() - (intptr_t)name##_begin()) \ - log->print(" " XSTR(name) "_offset='%d'" , \ - (intptr_t)name##_begin() - (intptr_t)this) - - -void nmethod::log_new_nmethod() const { - if (LogCompilation && xtty != NULL) { - ttyLocker ttyl; - HandleMark hm; - xtty->begin_elem("nmethod"); - log_identity(xtty); - xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", code_begin(), size()); - xtty->print(" address='" INTPTR_FORMAT "'", (intptr_t) this); - - LOG_OFFSET(xtty, relocation); - LOG_OFFSET(xtty, consts); - LOG_OFFSET(xtty, insts); - LOG_OFFSET(xtty, stub); - LOG_OFFSET(xtty, scopes_data); - LOG_OFFSET(xtty, scopes_pcs); - LOG_OFFSET(xtty, dependencies); - LOG_OFFSET(xtty, handler_table); - LOG_OFFSET(xtty, nul_chk_table); - LOG_OFFSET(xtty, oops); - - xtty->method(method()); - xtty->stamp(); - xtty->end_elem(); - } -} - -#undef LOG_OFFSET - - -// Print out more verbose output usually for a newly created nmethod. -void nmethod::print_on(outputStream* st, const char* msg) const { - if (st != NULL) { - ttyLocker ttyl; - if (WizardMode) { - CompileTask::print_compilation(st, this, msg, /*short_form:*/ true); - st->print_cr(" (" INTPTR_FORMAT ")", this); - } else { - CompileTask::print_compilation(st, this, msg, /*short_form:*/ false); - } - } -} - - -void nmethod::print_nmethod(bool printmethod) { - ttyLocker ttyl; // keep the following output all in one block - if (xtty != NULL) { - xtty->begin_head("print_nmethod"); - xtty->stamp(); - xtty->end_head(); - } - // print the header part first - print(); - // then print the requested information - if (printmethod) { - print_code(); - print_pcs(); - if (oop_maps()) { - oop_maps()->print(); - } - } - if (PrintDebugInfo) { - print_scopes(); - } - if (PrintRelocations) { - print_relocations(); - } - if (PrintDependencies) { - print_dependencies(); - } - if (PrintExceptionHandlers) { - print_handler_table(); - print_nul_chk_table(); - } - if (xtty != NULL) { - xtty->tail("print_nmethod"); - } -} - - -// Promote one word from an assembly-time handle to a live embedded oop. -inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) { - if (handle == NULL || - // As a special case, IC oops are initialized to 1 or -1. - handle == (jobject) Universe::non_oop_word()) { - (*dest) = (oop) handle; - } else { - (*dest) = JNIHandles::resolve_non_null(handle); - } -} - - -void nmethod::copy_oops(GrowableArray<jobject>* array) { - //assert(oops_size() == 0, "do this handshake just once, please"); - int length = array->length(); - assert((address)(oops_begin() + length) <= data_end(), "oops big enough"); - oop* dest = oops_begin(); - for (int index = 0 ; index < length; index++) { - initialize_immediate_oop(&dest[index], array->at(index)); - } - - // Now we can fix up all the oops in the code. We need to do this - // in the code because the assembler uses jobjects as placeholders. - // The code and relocations have already been initialized by the - // CodeBlob constructor, so it is valid even at this early point to - // iterate over relocations and patch the code. - fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true); -} - - -bool nmethod::is_at_poll_return(address pc) { - RelocIterator iter(this, pc, pc+1); - while (iter.next()) { - if (iter.type() == relocInfo::poll_return_type) - return true; - } - return false; -} - - -bool nmethod::is_at_poll_or_poll_return(address pc) { - RelocIterator iter(this, pc, pc+1); - while (iter.next()) { - relocInfo::relocType t = iter.type(); - if (t == relocInfo::poll_return_type || t == relocInfo::poll_type) - return true; - } - return false; -} - - -void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) { - // re-patch all oop-bearing instructions, just in case some oops moved - RelocIterator iter(this, begin, end); - while (iter.next()) { - if (iter.type() == relocInfo::oop_type) { - oop_Relocation* reloc = iter.oop_reloc(); - if (initialize_immediates && reloc->oop_is_immediate()) { - oop* dest = reloc->oop_addr(); - initialize_immediate_oop(dest, (jobject) *dest); - } - // Refresh the oop-related bits of this instruction. - reloc->fix_oop_relocation(); - } - - // There must not be any interfering patches or breakpoints. - assert(!(iter.type() == relocInfo::breakpoint_type - && iter.breakpoint_reloc()->active()), - "no active breakpoint"); - } -} - - -void nmethod::verify_oop_relocations() { - // Ensure sure that the code matches the current oop values - RelocIterator iter(this, NULL, NULL); - while (iter.next()) { - if (iter.type() == relocInfo::oop_type) { - oop_Relocation* reloc = iter.oop_reloc(); - if (!reloc->oop_is_immediate()) { - reloc->verify_oop_relocation(); - } - } - } -} - - -ScopeDesc* nmethod::scope_desc_at(address pc) { - PcDesc* pd = pc_desc_at(pc); - guarantee(pd != NULL, "scope must be present"); - return new ScopeDesc(this, pd->scope_decode_offset(), - pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(), - pd->return_oop()); -} - - -void nmethod::clear_inline_caches() { - assert(SafepointSynchronize::is_at_safepoint(), "cleaning of IC's only allowed at safepoint"); - if (is_zombie()) { - return; - } - - RelocIterator iter(this); - while (iter.next()) { - iter.reloc()->clear_inline_cache(); - } -} - - -void nmethod::cleanup_inline_caches() { - - assert_locked_or_safepoint(CompiledIC_lock); - - // If the method is not entrant or zombie then a JMP is plastered over the - // first few bytes. If an oop in the old code was there, that oop - // should not get GC'd. Skip the first few bytes of oops on - // not-entrant methods. - address low_boundary = verified_entry_point(); - if (!is_in_use()) { - low_boundary += NativeJump::instruction_size; - // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. - // This means that the low_boundary is going to be a little too high. - // This shouldn't matter, since oops of non-entrant methods are never used. - // In fact, why are we bothering to look at oops in a non-entrant method?? - } - - // Find all calls in an nmethod, and clear the ones that points to zombie methods - ResourceMark rm; - RelocIterator iter(this, low_boundary); - while(iter.next()) { - switch(iter.type()) { - case relocInfo::virtual_call_type: - case relocInfo::opt_virtual_call_type: { - CompiledIC *ic = CompiledIC_at(iter.reloc()); - // Ok, to lookup references to zombies here - CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination()); - if( cb != NULL && cb->is_nmethod() ) { - nmethod* nm = (nmethod*)cb; - // Clean inline caches pointing to both zombie and not_entrant methods - if (!nm->is_in_use() || (nm->method()->code() != nm)) ic->set_to_clean(); - } - break; - } - case relocInfo::static_call_type: { - CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc()); - CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination()); - if( cb != NULL && cb->is_nmethod() ) { - nmethod* nm = (nmethod*)cb; - // Clean inline caches pointing to both zombie and not_entrant methods - if (!nm->is_in_use() || (nm->method()->code() != nm)) csc->set_to_clean(); - } - break; - } - } - } -} - -// This is a private interface with the sweeper. -void nmethod::mark_as_seen_on_stack() { - assert(is_not_entrant(), "must be a non-entrant method"); - // Set the traversal mark to ensure that the sweeper does 2 - // cleaning passes before moving to zombie. - set_stack_traversal_mark(NMethodSweeper::traversal_count()); -} - -// Tell if a non-entrant method can be converted to a zombie (i.e., -// there are no activations on the stack, not in use by the VM, -// and not in use by the ServiceThread) -bool nmethod::can_not_entrant_be_converted() { - assert(is_not_entrant(), "must be a non-entrant method"); - - // Since the nmethod sweeper only does partial sweep the sweeper's traversal - // count can be greater than the stack traversal count before it hits the - // nmethod for the second time. - return stack_traversal_mark()+1 < NMethodSweeper::traversal_count() && - !is_locked_by_vm(); -} - -void nmethod::inc_decompile_count() { -#ifndef GRAAL - if (!is_compiled_by_c2()) return; -#endif - // Could be gated by ProfileTraps, but do not bother... - methodOop m = method(); - if (m == NULL) return; - methodDataOop mdo = m->method_data(); - if (mdo == NULL) return; - // There is a benign race here. See comments in methodDataOop.hpp. - mdo->inc_decompile_count(); -} - -void nmethod::make_unloaded(BoolObjectClosure* is_alive, oop cause) { - - post_compiled_method_unload(); - - // Since this nmethod is being unloaded, make sure that dependencies - // recorded in instanceKlasses get flushed and pass non-NULL closure to - // indicate that this work is being done during a GC. - assert(Universe::heap()->is_gc_active(), "should only be called during gc"); - assert(is_alive != NULL, "Should be non-NULL"); - // A non-NULL is_alive closure indicates that this is being called during GC. - flush_dependencies(is_alive); - - // Break cycle between nmethod & method - if (TraceClassUnloading && WizardMode) { - tty->print_cr("[Class unloading: Making nmethod " INTPTR_FORMAT - " unloadable], methodOop(" INTPTR_FORMAT - "), cause(" INTPTR_FORMAT ")", - this, (address)_method, (address)cause); - if (!Universe::heap()->is_gc_active()) - cause->klass()->print(); - } - // Unlink the osr method, so we do not look this up again - if (is_osr_method()) { - invalidate_osr_method(); - } - // If _method is already NULL the methodOop is about to be unloaded, - // so we don't have to break the cycle. Note that it is possible to - // have the methodOop live here, in case we unload the nmethod because - // it is pointing to some oop (other than the methodOop) being unloaded. - if (_method != NULL) { - // OSR methods point to the methodOop, but the methodOop does not - // point back! - if (_method->code() == this) { - _method->clear_code(); // Break a cycle - } - _method = NULL; // Clear the method of this dead nmethod - } - -#ifdef GRAAL - if (_graal_compiled_method != NULL) { - HotSpotCompiledMethod::set_nmethod(_graal_compiled_method, 0); - _graal_compiled_method = NULL; - } -#endif - - // Make the class unloaded - i.e., change state and notify sweeper - assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); - if (is_in_use()) { - // Transitioning directly from live to unloaded -- so - // we need to force a cache clean-up; remember this - // for later on. - CodeCache::set_needs_cache_clean(true); - } - _state = unloaded; - - // Log the unloading. - log_state_change(); - - // The methodOop is gone at this point - assert(_method == NULL, "Tautology"); - - set_osr_link(NULL); - //set_scavenge_root_link(NULL); // done by prune_scavenge_root_nmethods - NMethodSweeper::notify(this); -} - -void nmethod::invalidate_osr_method() { - assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); - // Remove from list of active nmethods - if (method() != NULL) - instanceKlass::cast(method()->method_holder())->remove_osr_nmethod(this); - // Set entry as invalid - _entry_bci = InvalidOSREntryBci; -} - -void nmethod::log_state_change() const { - if (LogCompilation) { - if (xtty != NULL) { - ttyLocker ttyl; // keep the following output all in one block - if (_state == unloaded) { - xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'", - os::current_thread_id()); - } else { - xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s", - os::current_thread_id(), - (_state == zombie ? " zombie='1'" : "")); - } - log_identity(xtty); - xtty->stamp(); - xtty->end_elem(); - } - } - if (PrintCompilation && _state != unloaded) { - print_on(tty, _state == zombie ? "made zombie" : "made not entrant"); - } -} - -// Common functionality for both make_not_entrant and make_zombie -bool nmethod::make_not_entrant_or_zombie(unsigned int state) { - assert(state == zombie || state == not_entrant, "must be zombie or not_entrant"); - assert(!is_zombie(), "should not already be a zombie"); - - // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below. - nmethodLocker nml(this); - methodHandle the_method(method()); - No_Safepoint_Verifier nsv; - - { - // invalidate osr nmethod before acquiring the patching lock since - // they both acquire leaf locks and we don't want a deadlock. - // This logic is equivalent to the logic below for patching the - // verified entry point of regular methods. - if (is_osr_method()) { - // this effectively makes the osr nmethod not entrant - invalidate_osr_method(); - } - - // Enter critical section. Does not block for safepoint. - MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); - - if (_state == state) { - // another thread already performed this transition so nothing - // to do, but return false to indicate this. - return false; - } - -#ifdef GRAAL - if (_graal_compiled_method != NULL) { - HotSpotCompiledMethod::set_nmethod(_graal_compiled_method, 0); - _graal_compiled_method = NULL; - } -#endif - - // The caller can be calling the method statically or through an inline - // cache call. - if (!is_osr_method() && !is_not_entrant()) { - NativeJump::patch_verified_entry(entry_point(), verified_entry_point(), - SharedRuntime::get_handle_wrong_method_stub()); - } - - if (is_in_use()) { - // It's a true state change, so mark the method as decompiled. - // Do it only for transition from alive. - inc_decompile_count(); - } - - // Change state - _state = state; - - // Log the transition once - log_state_change(); - - // Remove nmethod from method. - // We need to check if both the _code and _from_compiled_code_entry_point - // refer to this nmethod because there is a race in setting these two fields - // in methodOop as seen in bugid 4947125. - // If the vep() points to the zombie nmethod, the memory for the nmethod - // could be flushed and the compiler and vtable stubs could still call - // through it. - if (method() != NULL && (method()->code() == this || - method()->from_compiled_entry() == verified_entry_point())) { - HandleMark hm; - method()->clear_code(); - } - - if (state == not_entrant) { - mark_as_seen_on_stack(); - } - - } // leave critical region under Patching_lock - - // When the nmethod becomes zombie it is no longer alive so the - // dependencies must be flushed. nmethods in the not_entrant - // state will be flushed later when the transition to zombie - // happens or they get unloaded. - if (state == zombie) { - { - // Flushing dependecies must be done before any possible - // safepoint can sneak in, otherwise the oops used by the - // dependency logic could have become stale. - MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); - flush_dependencies(NULL); - } - - // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload - // event and it hasn't already been reported for this nmethod then - // report it now. The event may have been reported earilier if the GC - // marked it for unloading). JvmtiDeferredEventQueue support means - // we no longer go to a safepoint here. - post_compiled_method_unload(); - -#ifdef ASSERT - // It's no longer safe to access the oops section since zombie - // nmethods aren't scanned for GC. - _oops_are_stale = true; -#endif - } else { - assert(state == not_entrant, "other cases may need to be handled differently"); - } - - if (TraceCreateZombies) { - tty->print_cr("nmethod <" INTPTR_FORMAT "> code made %s", this, (state == not_entrant) ? "not entrant" : "zombie"); - } - - // Make sweeper aware that there is a zombie method that needs to be removed - NMethodSweeper::notify(this); - - return true; -} - -void nmethod::flush() { - // Note that there are no valid oops in the nmethod anymore. - assert(is_zombie() || (is_osr_method() && is_unloaded()), "must be a zombie method"); - assert(is_marked_for_reclamation() || (is_osr_method() && is_unloaded()), "must be marked for reclamation"); - - assert (!is_locked_by_vm(), "locked methods shouldn't be flushed"); - assert_locked_or_safepoint(CodeCache_lock); - - // completely deallocate this method - Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, this); - if (PrintMethodFlushing) { - tty->print_cr("*flushing nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT "/Free CodeCache:" SIZE_FORMAT "Kb", - _compile_id, this, CodeCache::nof_blobs(), CodeCache::unallocated_capacity()/1024); - } - - // We need to deallocate any ExceptionCache data. - // Note that we do not need to grab the nmethod lock for this, it - // better be thread safe if we're disposing of it! - ExceptionCache* ec = exception_cache(); - set_exception_cache(NULL); - while(ec != NULL) { - ExceptionCache* next = ec->next(); - delete ec; - ec = next; - } - - if (on_scavenge_root_list()) { - CodeCache::drop_scavenge_root_nmethod(this); - } - - if (is_speculatively_disconnected()) { - CodeCache::remove_saved_code(this); - } - -#ifdef SHARK - ((SharkCompiler *) compiler())->free_compiled_method(insts_begin()); -#endif // SHARK - - ((CodeBlob*)(this))->flush(); - - CodeCache::free(this); -} - - -// -// Notify all classes this nmethod is dependent on that it is no -// longer dependent. This should only be called in two situations. -// First, when a nmethod transitions to a zombie all dependents need -// to be clear. Since zombification happens at a safepoint there's no -// synchronization issues. The second place is a little more tricky. -// During phase 1 of mark sweep class unloading may happen and as a -// result some nmethods may get unloaded. In this case the flushing -// of dependencies must happen during phase 1 since after GC any -// dependencies in the unloaded nmethod won't be updated, so -// traversing the dependency information in unsafe. In that case this -// function is called with a non-NULL argument and this function only -// notifies instanceKlasses that are reachable - -void nmethod::flush_dependencies(BoolObjectClosure* is_alive) { - assert_locked_or_safepoint(CodeCache_lock); - assert(Universe::heap()->is_gc_active() == (is_alive != NULL), - "is_alive is non-NULL if and only if we are called during GC"); - if (!has_flushed_dependencies()) { - set_has_flushed_dependencies(); - for (Dependencies::DepStream deps(this); deps.next(); ) { - klassOop klass = deps.context_type(); - if (klass == NULL) continue; // ignore things like evol_method - - // During GC the is_alive closure is non-NULL, and is used to - // determine liveness of dependees that need to be updated. - if (is_alive == NULL || is_alive->do_object_b(klass)) { - instanceKlass::cast(klass)->remove_dependent_nmethod(this); - } - } - } -} - - -// If this oop is not live, the nmethod can be unloaded. -bool nmethod::can_unload(BoolObjectClosure* is_alive, - OopClosure* keep_alive, - oop* root, bool unloading_occurred) { - assert(root != NULL, "just checking"); - oop obj = *root; - if (obj == NULL || is_alive->do_object_b(obj)) { - return false; - } - if (obj->is_compiledICHolder()) { - compiledICHolderOop cichk_oop = compiledICHolderOop(obj); - if (is_alive->do_object_b( - cichk_oop->holder_method()->method_holder()) && - is_alive->do_object_b(cichk_oop->holder_klass())) { - // The oop should be kept alive - keep_alive->do_oop(root); - return false; - } - } - // If ScavengeRootsInCode is true, an nmethod might be unloaded - // simply because one of its constant oops has gone dead. - // No actual classes need to be unloaded in order for this to occur. - assert(unloading_occurred || ScavengeRootsInCode, "Inconsistency in unloading"); - make_unloaded(is_alive, obj); - return true; -} - -// ------------------------------------------------------------------ -// post_compiled_method_load_event -// new method for install_code() path -// Transfer information from compilation to jvmti -void nmethod::post_compiled_method_load_event() { - - methodOop moop = method(); -#ifndef USDT2 - HS_DTRACE_PROBE8(hotspot, compiled__method__load, - moop->klass_name()->bytes(), - moop->klass_name()->utf8_length(), - moop->name()->bytes(), - moop->name()->utf8_length(), - moop->signature()->bytes(), - moop->signature()->utf8_length(), - insts_begin(), insts_size()); -#else /* USDT2 */ - HOTSPOT_COMPILED_METHOD_LOAD( - (char *) moop->klass_name()->bytes(), - moop->klass_name()->utf8_length(), - (char *) moop->name()->bytes(), - moop->name()->utf8_length(), - (char *) moop->signature()->bytes(), - moop->signature()->utf8_length(), - insts_begin(), insts_size()); -#endif /* USDT2 */ - - if (JvmtiExport::should_post_compiled_method_load() || - JvmtiExport::should_post_compiled_method_unload()) { - get_and_cache_jmethod_id(); - } - - if (JvmtiExport::should_post_compiled_method_load()) { - // Let the Service thread (which is a real Java thread) post the event - MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); - JvmtiDeferredEventQueue::enqueue( - JvmtiDeferredEvent::compiled_method_load_event(this)); - } -} - -jmethodID nmethod::get_and_cache_jmethod_id() { - if (_jmethod_id == NULL) { - // Cache the jmethod_id since it can no longer be looked up once the - // method itself has been marked for unloading. - _jmethod_id = method()->jmethod_id(); - } - return _jmethod_id; -} - -void nmethod::post_compiled_method_unload() { - if (unload_reported()) { - // During unloading we transition to unloaded and then to zombie - // and the unloading is reported during the first transition. - return; - } - - assert(_method != NULL && !is_unloaded(), "just checking"); - DTRACE_METHOD_UNLOAD_PROBE(method()); - - // If a JVMTI agent has enabled the CompiledMethodUnload event then - // post the event. Sometime later this nmethod will be made a zombie - // by the sweeper but the methodOop will not be valid at that point. - // If the _jmethod_id is null then no load event was ever requested - // so don't bother posting the unload. The main reason for this is - // that the jmethodID is a weak reference to the methodOop so if - // it's being unloaded there's no way to look it up since the weak - // ref will have been cleared. - if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) { - assert(!unload_reported(), "already unloaded"); - JvmtiDeferredEvent event = - JvmtiDeferredEvent::compiled_method_unload_event(this, - _jmethod_id, insts_begin()); - if (SafepointSynchronize::is_at_safepoint()) { - // Don't want to take the queueing lock. Add it as pending and - // it will get enqueued later. - JvmtiDeferredEventQueue::add_pending_event(event); - } else { - MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); - JvmtiDeferredEventQueue::enqueue(event); - } - } - - // The JVMTI CompiledMethodUnload event can be enabled or disabled at - // any time. As the nmethod is being unloaded now we mark it has - // having the unload event reported - this will ensure that we don't - // attempt to report the event in the unlikely scenario where the - // event is enabled at the time the nmethod is made a zombie. - set_unload_reported(); -} - -// This is called at the end of the strong tracing/marking phase of a -// GC to unload an nmethod if it contains otherwise unreachable -// oops. - -void nmethod::do_unloading(BoolObjectClosure* is_alive, - OopClosure* keep_alive, bool unloading_occurred) { - // Make sure the oop's ready to receive visitors - assert(!is_zombie() && !is_unloaded(), - "should not call follow on zombie or unloaded nmethod"); - - // If the method is not entrant then a JMP is plastered over the - // first few bytes. If an oop in the old code was there, that oop - // should not get GC'd. Skip the first few bytes of oops on - // not-entrant methods. - address low_boundary = verified_entry_point(); - if (is_not_entrant()) { - low_boundary += NativeJump::instruction_size; - // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. - // (See comment above.) - } - - // The RedefineClasses() API can cause the class unloading invariant - // to no longer be true. See jvmtiExport.hpp for details. - // Also, leave a debugging breadcrumb in local flag. - bool a_class_was_redefined = JvmtiExport::has_redefined_a_class(); - if (a_class_was_redefined) { - // This set of the unloading_occurred flag is done before the - // call to post_compiled_method_unload() so that the unloading - // of this nmethod is reported. - unloading_occurred = true; - } - - // Follow methodOop - if (can_unload(is_alive, keep_alive, (oop*)&_method, unloading_occurred)) { - return; - } - - if (_graal_compiled_method != NULL && can_unload(is_alive, keep_alive, (oop*)&_graal_compiled_method, unloading_occurred)) { - return; - } - - // Exception cache - ExceptionCache* ec = exception_cache(); - while (ec != NULL) { - oop* ex_addr = (oop*)ec->exception_type_addr(); - oop ex = *ex_addr; - ExceptionCache* next_ec = ec->next(); - if (ex != NULL && !is_alive->do_object_b(ex)) { - assert(!ex->is_compiledICHolder(), "Possible error here"); - remove_from_exception_cache(ec); - } - ec = next_ec; - } - - // If class unloading occurred we first iterate over all inline caches and - // clear ICs where the cached oop is referring to an unloaded klass or method. - // The remaining live cached oops will be traversed in the relocInfo::oop_type - // iteration below. - if (unloading_occurred) { - RelocIterator iter(this, low_boundary); - while(iter.next()) { - if (iter.type() == relocInfo::virtual_call_type) { - CompiledIC *ic = CompiledIC_at(iter.reloc()); - oop ic_oop = ic->cached_oop(); - if (ic_oop != NULL && !is_alive->do_object_b(ic_oop)) { - // The only exception is compiledICHolder oops which may - // yet be marked below. (We check this further below). - if (ic_oop->is_compiledICHolder()) { - compiledICHolderOop cichk_oop = compiledICHolderOop(ic_oop); - if (is_alive->do_object_b( - cichk_oop->holder_method()->method_holder()) && - is_alive->do_object_b(cichk_oop->holder_klass())) { - continue; - } - } - ic->set_to_clean(); - assert(ic->cached_oop() == NULL, - "cached oop in IC should be cleared"); - } - } - } - } - - // Compiled code - RelocIterator iter(this, low_boundary); - while (iter.next()) { - if (iter.type() == relocInfo::oop_type) { - oop_Relocation* r = iter.oop_reloc(); - // In this loop, we must only traverse those oops directly embedded in - // the code. Other oops (oop_index>0) are seen as part of scopes_oops. - assert(1 == (r->oop_is_immediate()) + - (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), - "oop must be found in exactly one place"); - if (r->oop_is_immediate() && r->oop_value() != NULL) { - if (can_unload(is_alive, keep_alive, r->oop_addr(), unloading_occurred)) { - return; - } - } - } - } - - - // Scopes - for (oop* p = oops_begin(); p < oops_end(); p++) { - if (*p == Universe::non_oop_word()) continue; // skip non-oops - if (can_unload(is_alive, keep_alive, p, unloading_occurred)) { - return; - } - } - -#ifndef PRODUCT - // This nmethod was not unloaded; check below that all CompiledICs - // refer to marked oops. - { - RelocIterator iter(this, low_boundary); - while (iter.next()) { - if (iter.type() == relocInfo::virtual_call_type) { - CompiledIC *ic = CompiledIC_at(iter.reloc()); - oop ic_oop = ic->cached_oop(); - assert(ic_oop == NULL || is_alive->do_object_b(ic_oop), - "Found unmarked ic_oop in reachable nmethod"); - } - } - } -#endif // !PRODUCT -} - -// This method is called twice during GC -- once while -// tracing the "active" nmethods on thread stacks during -// the (strong) marking phase, and then again when walking -// the code cache contents during the weak roots processing -// phase. The two uses are distinguished by means of the -// 'do_strong_roots_only' flag, which is true in the first -// case. We want to walk the weak roots in the nmethod -// only in the second case. The weak roots in the nmethod -// are the oops in the ExceptionCache and the InlineCache -// oops. -void nmethod::oops_do(OopClosure* f, bool do_strong_roots_only) { - // make sure the oops ready to receive visitors - assert(!is_zombie() && !is_unloaded(), - "should not call follow on zombie or unloaded nmethod"); - - // If the method is not entrant or zombie then a JMP is plastered over the - // first few bytes. If an oop in the old code was there, that oop - // should not get GC'd. Skip the first few bytes of oops on - // not-entrant methods. - address low_boundary = verified_entry_point(); - if (is_not_entrant()) { - low_boundary += NativeJump::instruction_size; - // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. - // (See comment above.) - } - - // Compiled code - f->do_oop((oop*) &_method); - f->do_oop((oop*) &_graal_compiled_method); - if (!do_strong_roots_only) { - // weak roots processing phase -- update ExceptionCache oops - ExceptionCache* ec = exception_cache(); - while(ec != NULL) { - f->do_oop((oop*)ec->exception_type_addr()); - ec = ec->next(); - } - } // Else strong roots phase -- skip oops in ExceptionCache - - RelocIterator iter(this, low_boundary); - - while (iter.next()) { - if (iter.type() == relocInfo::oop_type ) { - oop_Relocation* r = iter.oop_reloc(); - // In this loop, we must only follow those oops directly embedded in - // the code. Other oops (oop_index>0) are seen as part of scopes_oops. - assert(1 == (r->oop_is_immediate()) + - (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), - "oop must be found in exactly one place"); - if (r->oop_is_immediate() && r->oop_value() != NULL) { - f->do_oop(r->oop_addr()); - } - } - } - - // Scopes - // This includes oop constants not inlined in the code stream. - for (oop* p = oops_begin(); p < oops_end(); p++) { - if (*p == Universe::non_oop_word()) continue; // skip non-oops - f->do_oop(p); - } -} - -#define NMETHOD_SENTINEL ((nmethod*)badAddress) - -nmethod* volatile nmethod::_oops_do_mark_nmethods; - -// An nmethod is "marked" if its _mark_link is set non-null. -// Even if it is the end of the linked list, it will have a non-null link value, -// as long as it is on the list. -// This code must be MP safe, because it is used from parallel GC passes. -bool nmethod::test_set_oops_do_mark() { - assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called"); - nmethod* observed_mark_link = _oops_do_mark_link; - if (observed_mark_link == NULL) { - // Claim this nmethod for this thread to mark. - observed_mark_link = (nmethod*) - Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_link, NULL); - if (observed_mark_link == NULL) { - - // Atomically append this nmethod (now claimed) to the head of the list: - nmethod* observed_mark_nmethods = _oops_do_mark_nmethods; - for (;;) { - nmethod* required_mark_nmethods = observed_mark_nmethods; - _oops_do_mark_link = required_mark_nmethods; - observed_mark_nmethods = (nmethod*) - Atomic::cmpxchg_ptr(this, &_oops_do_mark_nmethods, required_mark_nmethods); - if (observed_mark_nmethods == required_mark_nmethods) - break; - } - // Mark was clear when we first saw this guy. - NOT_PRODUCT(if (TraceScavenge) print_on(tty, "oops_do, mark")); - return false; - } - } - // On fall through, another racing thread marked this nmethod before we did. - return true; -} - -void nmethod::oops_do_marking_prologue() { - NOT_PRODUCT(if (TraceScavenge) tty->print_cr("[oops_do_marking_prologue")); - assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row"); - // We use cmpxchg_ptr instead of regular assignment here because the user - // may fork a bunch of threads, and we need them all to see the same state. - void* observed = Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, NULL); - guarantee(observed == NULL, "no races in this sequential code"); -} - -void nmethod::oops_do_marking_epilogue() { - assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row"); - nmethod* cur = _oops_do_mark_nmethods; - while (cur != NMETHOD_SENTINEL) { - assert(cur != NULL, "not NULL-terminated"); - nmethod* next = cur->_oops_do_mark_link; - cur->_oops_do_mark_link = NULL; - cur->fix_oop_relocations(); - NOT_PRODUCT(if (TraceScavenge) cur->print_on(tty, "oops_do, unmark")); - cur = next; - } - void* required = _oops_do_mark_nmethods; - void* observed = Atomic::cmpxchg_ptr(NULL, &_oops_do_mark_nmethods, required); - guarantee(observed == required, "no races in this sequential code"); - NOT_PRODUCT(if (TraceScavenge) tty->print_cr("oops_do_marking_epilogue]")); -} - -class DetectScavengeRoot: public OopClosure { - bool _detected_scavenge_root; -public: - DetectScavengeRoot() : _detected_scavenge_root(false) - { NOT_PRODUCT(_print_nm = NULL); } - bool detected_scavenge_root() { return _detected_scavenge_root; } - virtual void do_oop(oop* p) { - if ((*p) != NULL && (*p)->is_scavengable()) { - NOT_PRODUCT(maybe_print(p)); - _detected_scavenge_root = true; - } - } - virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } - -#ifndef PRODUCT - nmethod* _print_nm; - void maybe_print(oop* p) { - if (_print_nm == NULL) return; - if (!_detected_scavenge_root) _print_nm->print_on(tty, "new scavenge root"); - tty->print_cr(""PTR_FORMAT"[offset=%d] detected scavengable oop "PTR_FORMAT" (found at "PTR_FORMAT")", - _print_nm, (int)((intptr_t)p - (intptr_t)_print_nm), - (intptr_t)(*p), (intptr_t)p); - (*p)->print(); - } -#endif //PRODUCT -}; - -bool nmethod::detect_scavenge_root_oops() { - DetectScavengeRoot detect_scavenge_root; - NOT_PRODUCT(if (TraceScavenge) detect_scavenge_root._print_nm = this); - oops_do(&detect_scavenge_root); - return detect_scavenge_root.detected_scavenge_root(); -} - -// Method that knows how to preserve outgoing arguments at call. This method must be -// called with a frame corresponding to a Java invoke -void nmethod::preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { -#ifndef SHARK - if (!method()->is_native()) { - SimpleScopeDesc ssd(this, fr.pc()); - Bytecode_invoke call(ssd.method(), ssd.bci()); - // compiled invokedynamic call sites have an implicit receiver at - // resolution time, so make sure it gets GC'ed. - bool has_receiver = !call.is_invokestatic(); - Symbol* signature = call.signature(); - fr.oops_compiled_arguments_do(signature, has_receiver, reg_map, f); - } -#endif // !SHARK -} - - -oop nmethod::embeddedOop_at(u_char* p) { - RelocIterator iter(this, p, p + 1); - while (iter.next()) - if (iter.type() == relocInfo::oop_type) { - return iter.oop_reloc()->oop_value(); - } - return NULL; -} - - -inline bool includes(void* p, void* from, void* to) { - return from <= p && p < to; -} - - -void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) { - assert(count >= 2, "must be sentinel values, at least"); - -#ifdef ASSERT - // must be sorted and unique; we do a binary search in find_pc_desc() - int prev_offset = pcs[0].pc_offset(); - assert(prev_offset == PcDesc::lower_offset_limit, - "must start with a sentinel"); - for (int i = 1; i < count; i++) { - int this_offset = pcs[i].pc_offset(); - assert(this_offset > prev_offset, "offsets must be sorted"); - prev_offset = this_offset; - } - assert(prev_offset == PcDesc::upper_offset_limit, - "must end with a sentinel"); -#endif //ASSERT - - // Search for MethodHandle invokes and tag the nmethod. - for (int i = 0; i < count; i++) { - if (pcs[i].is_method_handle_invoke()) { - set_has_method_handle_invokes(true); - break; - } - } - assert(has_method_handle_invokes() == (_deoptimize_mh_offset != -1), "must have deopt mh handler"); - - int size = count * sizeof(PcDesc); - assert(scopes_pcs_size() >= size, "oob"); - memcpy(scopes_pcs_begin(), pcs, size); - - // Adjust the final sentinel downward. - PcDesc* last_pc = &scopes_pcs_begin()[count-1]; - assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity"); - last_pc->set_pc_offset(content_size() + 1); - for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) { - // Fill any rounding gaps with copies of the last record. - last_pc[1] = last_pc[0]; - } - // The following assert could fail if sizeof(PcDesc) is not - // an integral multiple of oopSize (the rounding term). - // If it fails, change the logic to always allocate a multiple - // of sizeof(PcDesc), and fill unused words with copies of *last_pc. - assert(last_pc + 1 == scopes_pcs_end(), "must match exactly"); -} - -void nmethod::copy_scopes_data(u_char* buffer, int size) { - assert(scopes_data_size() >= size, "oob"); - memcpy(scopes_data_begin(), buffer, size); -} - - -#ifdef ASSERT -static PcDesc* linear_search(nmethod* nm, int pc_offset, bool approximate) { - PcDesc* lower = nm->scopes_pcs_begin(); - PcDesc* upper = nm->scopes_pcs_end(); - lower += 1; // exclude initial sentinel - PcDesc* res = NULL; - for (PcDesc* p = lower; p < upper; p++) { - NOT_PRODUCT(--nmethod_stats.pc_desc_tests); // don't count this call to match_desc - if (match_desc(p, pc_offset, approximate)) { - if (res == NULL) - res = p; - else - res = (PcDesc*) badAddress; - } - } - return res; -} -#endif - - -// Finds a PcDesc with real-pc equal to "pc" -PcDesc* nmethod::find_pc_desc_internal(address pc, bool approximate) { - address base_address = code_begin(); - if ((pc < base_address) || - (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) { - return NULL; // PC is wildly out of range - } - int pc_offset = (int) (pc - base_address); - - // Check the PcDesc cache if it contains the desired PcDesc - // (This as an almost 100% hit rate.) - PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate); - if (res != NULL) { - assert(res == linear_search(this, pc_offset, approximate), "cache ok"); - return res; - } - - // Fallback algorithm: quasi-linear search for the PcDesc - // Find the last pc_offset less than the given offset. - // The successor must be the required match, if there is a match at all. - // (Use a fixed radix to avoid expensive affine pointer arithmetic.) - PcDesc* lower = scopes_pcs_begin(); - PcDesc* upper = scopes_pcs_end(); - upper -= 1; // exclude final sentinel - if (lower >= upper) return NULL; // native method; no PcDescs at all - -#define assert_LU_OK \ - /* invariant on lower..upper during the following search: */ \ - assert(lower->pc_offset() < pc_offset, "sanity"); \ - assert(upper->pc_offset() >= pc_offset, "sanity") - assert_LU_OK; - - // Use the last successful return as a split point. - PcDesc* mid = _pc_desc_cache.last_pc_desc(); - NOT_PRODUCT(++nmethod_stats.pc_desc_searches); - if (mid->pc_offset() < pc_offset) { - lower = mid; - } else { - upper = mid; - } - - // Take giant steps at first (4096, then 256, then 16, then 1) - const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1); - const int RADIX = (1 << LOG2_RADIX); - for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) { - while ((mid = lower + step) < upper) { - assert_LU_OK; - NOT_PRODUCT(++nmethod_stats.pc_desc_searches); - if (mid->pc_offset() < pc_offset) { - lower = mid; - } else { - upper = mid; - break; - } - } - assert_LU_OK; - } - - // Sneak up on the value with a linear search of length ~16. - while (true) { - assert_LU_OK; - mid = lower + 1; - NOT_PRODUCT(++nmethod_stats.pc_desc_searches); - if (mid->pc_offset() < pc_offset) { - lower = mid; - } else { - upper = mid; - break; - } - } -#undef assert_LU_OK - - if (match_desc(upper, pc_offset, approximate)) { - assert(upper == linear_search(this, pc_offset, approximate), "search ok"); - _pc_desc_cache.add_pc_desc(upper); - return upper; - } else { - assert(NULL == linear_search(this, pc_offset, approximate), "search ok"); - return NULL; - } -} - - -bool nmethod::check_all_dependencies() { - bool found_check = false; - // wholesale check of all dependencies - for (Dependencies::DepStream deps(this); deps.next(); ) { - if (deps.check_dependency() != NULL) { - found_check = true; - NOT_DEBUG(break); - } - } - return found_check; // tell caller if we found anything -} - -bool nmethod::check_dependency_on(DepChange& changes) { - // What has happened: - // 1) a new class dependee has been added - // 2) dependee and all its super classes have been marked - bool found_check = false; // set true if we are upset - for (Dependencies::DepStream deps(this); deps.next(); ) { - // Evaluate only relevant dependencies. - if (deps.spot_check_dependency_at(changes) != NULL) { - found_check = true; - NOT_DEBUG(break); - } - } - return found_check; -} - -bool nmethod::is_evol_dependent_on(klassOop dependee) { - instanceKlass *dependee_ik = instanceKlass::cast(dependee); - objArrayOop dependee_methods = dependee_ik->methods(); - for (Dependencies::DepStream deps(this); deps.next(); ) { - if (deps.type() == Dependencies::evol_method) { - methodOop method = deps.method_argument(0); - for (int j = 0; j < dependee_methods->length(); j++) { - if ((methodOop) dependee_methods->obj_at(j) == method) { - // RC_TRACE macro has an embedded ResourceMark - RC_TRACE(0x01000000, - ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)", - _method->method_holder()->klass_part()->external_name(), - _method->name()->as_C_string(), - _method->signature()->as_C_string(), compile_id(), - method->method_holder()->klass_part()->external_name(), - method->name()->as_C_string(), - method->signature()->as_C_string())); - if (TraceDependencies || LogCompilation) - deps.log_dependency(dependee); - return true; - } - } - } - } - return false; -} - -// Called from mark_for_deoptimization, when dependee is invalidated. -bool nmethod::is_dependent_on_method(methodOop dependee) { - for (Dependencies::DepStream deps(this); deps.next(); ) { - if (deps.type() != Dependencies::evol_method) - continue; - methodOop method = deps.method_argument(0); - if (method == dependee) return true; - } - return false; -} - - -bool nmethod::is_patchable_at(address instr_addr) { - assert(insts_contains(instr_addr), "wrong nmethod used"); - if (is_zombie()) { - // a zombie may never be patched - return false; - } - return true; -} - - -address nmethod::continuation_for_implicit_exception(address pc) { - // Exception happened outside inline-cache check code => we are inside - // an active nmethod => use cpc to determine a return address - int exception_offset = pc - code_begin(); - int cont_offset = ImplicitExceptionTable(this).at( exception_offset ); -#ifdef ASSERT - if (cont_offset == 0) { - Thread* thread = ThreadLocalStorage::get_thread_slow(); - ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY - HandleMark hm(thread); - ResourceMark rm(thread); - CodeBlob* cb = CodeCache::find_blob(pc); - assert(cb != NULL && cb == this, ""); - tty->print_cr("implicit exception happened at " INTPTR_FORMAT, pc); - print(); - method()->print_codes(); - print_code(); - print_pcs(); - } -#endif - if (cont_offset == 0) { - // Let the normal error handling report the exception - return NULL; - } - return code_begin() + cont_offset; -} - - - -void nmethod_init() { - // make sure you didn't forget to adjust the filler fields - assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word"); -} - - -//------------------------------------------------------------------------------------------- - - -// QQQ might we make this work from a frame?? -nmethodLocker::nmethodLocker(address pc) { - CodeBlob* cb = CodeCache::find_blob(pc); - guarantee(cb != NULL && cb->is_nmethod(), "bad pc for a nmethod found"); - _nm = (nmethod*)cb; - lock_nmethod(_nm); -} - -// Only JvmtiDeferredEvent::compiled_method_unload_event() -// should pass zombie_ok == true. -void nmethodLocker::lock_nmethod(nmethod* nm, bool zombie_ok) { - if (nm == NULL) return; - Atomic::inc(&nm->_lock_count); - guarantee(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method"); -} - -void nmethodLocker::unlock_nmethod(nmethod* nm) { - if (nm == NULL) return; - Atomic::dec(&nm->_lock_count); - guarantee(nm->_lock_count >= 0, "unmatched nmethod lock/unlock"); -} - - -// ----------------------------------------------------------------------------- -// nmethod::get_deopt_original_pc -// -// Return the original PC for the given PC if: -// (a) the given PC belongs to a nmethod and -// (b) it is a deopt PC -address nmethod::get_deopt_original_pc(const frame* fr) { - if (fr->cb() == NULL) return NULL; - - nmethod* nm = fr->cb()->as_nmethod_or_null(); - if (nm != NULL && nm->is_deopt_pc(fr->pc())) - return nm->get_original_pc(fr); - - return NULL; -} - - -// ----------------------------------------------------------------------------- -// MethodHandle - -bool nmethod::is_method_handle_return(address return_pc) { - if (!has_method_handle_invokes()) return false; - PcDesc* pd = pc_desc_at(return_pc); - if (pd == NULL) - return false; - return pd->is_method_handle_invoke(); -} - - -// ----------------------------------------------------------------------------- -// Verification - -class VerifyOopsClosure: public OopClosure { - nmethod* _nm; - bool _ok; -public: - VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { } - bool ok() { return _ok; } - virtual void do_oop(oop* p) { - if ((*p) == NULL || (*p)->is_oop()) return; - if (_ok) { - _nm->print_nmethod(true); - _ok = false; - } - tty->print_cr("*** non-oop "PTR_FORMAT" found at "PTR_FORMAT" (offset %d)", - (intptr_t)(*p), (intptr_t)p, (int)((intptr_t)p - (intptr_t)_nm)); - } - virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } -}; - -void nmethod::verify() { - - // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant - // seems odd. - - if( is_zombie() || is_not_entrant() ) - return; - - // Make sure all the entry points are correctly aligned for patching. - NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point()); - - assert(method()->is_oop(), "must be valid"); - - ResourceMark rm; - - if (!CodeCache::contains(this)) { - fatal(err_msg("nmethod at " INTPTR_FORMAT " not in zone", this)); - } - - if(is_native_method() ) - return; - - nmethod* nm = CodeCache::find_nmethod(verified_entry_point()); - if (nm != this) { - fatal(err_msg("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", - this)); - } - - for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { - if (! p->verify(this)) { - tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", this); - } - } - - VerifyOopsClosure voc(this); - oops_do(&voc); - assert(voc.ok(), "embedded oops must be OK"); - verify_scavenge_root_oops(); - - verify_scopes(); -} - - -void nmethod::verify_interrupt_point(address call_site) { - // This code does not work in release mode since - // owns_lock only is available in debug mode. - CompiledIC* ic = NULL; - Thread *cur = Thread::current(); - if (CompiledIC_lock->owner() == cur || - ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) && - SafepointSynchronize::is_at_safepoint())) { - ic = CompiledIC_at(call_site); - CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops()); - } else { - MutexLocker ml_verify (CompiledIC_lock); - ic = CompiledIC_at(call_site); - } - PcDesc* pd = pc_desc_at(ic->end_of_call()); - assert(pd != NULL, "PcDesc must exist"); - for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(), - pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(), - pd->return_oop()); - !sd->is_top(); sd = sd->sender()) { - sd->verify(); - } -} - -void nmethod::verify_scopes() { - if( !method() ) return; // Runtime stubs have no scope - if (method()->is_native()) return; // Ignore stub methods. - // iterate through all interrupt point - // and verify the debug information is valid. - RelocIterator iter((nmethod*)this); - while (iter.next()) { - address stub = NULL; - switch (iter.type()) { - case relocInfo::virtual_call_type: - verify_interrupt_point(iter.addr()); - break; - case relocInfo::opt_virtual_call_type: - stub = iter.opt_virtual_call_reloc()->static_stub(); - verify_interrupt_point(iter.addr()); - break; - case relocInfo::static_call_type: - stub = iter.static_call_reloc()->static_stub(); - //verify_interrupt_point(iter.addr()); - break; - case relocInfo::runtime_call_type: - address destination = iter.reloc()->value(); - // Right now there is no way to find out which entries support - // an interrupt point. It would be nice if we had this - // information in a table. - break; - } -#ifndef GRAAL - assert(stub == NULL || stub_contains(stub), "static call stub outside stub section"); -#endif - } -} - - -// ----------------------------------------------------------------------------- -// Non-product code -#ifndef PRODUCT - -class DebugScavengeRoot: public OopClosure { - nmethod* _nm; - bool _ok; -public: - DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { } - bool ok() { return _ok; } - virtual void do_oop(oop* p) { - if ((*p) == NULL || !(*p)->is_scavengable()) return; - if (_ok) { - _nm->print_nmethod(true); - _ok = false; - } - tty->print_cr("*** scavengable oop "PTR_FORMAT" found at "PTR_FORMAT" (offset %d)", - (intptr_t)(*p), (intptr_t)p, (int)((intptr_t)p - (intptr_t)_nm)); - (*p)->print(); - } - virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } -}; - -void nmethod::verify_scavenge_root_oops() { - if (!on_scavenge_root_list()) { - // Actually look inside, to verify the claim that it's clean. - DebugScavengeRoot debug_scavenge_root(this); - oops_do(&debug_scavenge_root); - if (!debug_scavenge_root.ok()) - fatal("found an unadvertised bad scavengable oop in the code cache"); - } - assert(scavenge_root_not_marked(), ""); -} - -#endif // PRODUCT - -// Printing operations - -void nmethod::print() const { - ResourceMark rm; - ttyLocker ttyl; // keep the following output all in one block - - tty->print("Compiled method "); - - if (is_compiled_by_c1()) { - tty->print("(c1) "); - } else if (is_compiled_by_c2()) { - tty->print("(c2) "); - } else if (is_compiled_by_shark()) { - tty->print("(shark) "); - } else { - tty->print("(nm) "); - } - - print_on(tty, NULL); - - if (WizardMode) { - tty->print("((nmethod*) "INTPTR_FORMAT ") ", this); - tty->print(" for method " INTPTR_FORMAT , (address)method()); - tty->print(" { "); - if (is_in_use()) tty->print("in_use "); - if (is_not_entrant()) tty->print("not_entrant "); - if (is_zombie()) tty->print("zombie "); - if (is_unloaded()) tty->print("unloaded "); - if (on_scavenge_root_list()) tty->print("scavenge_root "); - tty->print_cr("}:"); - } - if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", - (address)this, - (address)this + size(), - size()); - if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", - relocation_begin(), - relocation_end(), - relocation_size()); - if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", - consts_begin(), - consts_end(), - consts_size()); - if (insts_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", - insts_begin(), - insts_end(), - insts_size()); - if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", - stub_begin(), - stub_end(), - stub_size()); - if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", - oops_begin(), - oops_end(), - oops_size()); - if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", - scopes_data_begin(), - scopes_data_end(), - scopes_data_size()); - if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", - scopes_pcs_begin(), - scopes_pcs_end(), - scopes_pcs_size()); - if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", - dependencies_begin(), - dependencies_end(), - dependencies_size()); - if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", - handler_table_begin(), - handler_table_end(), - handler_table_size()); - if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", - nul_chk_table_begin(), - nul_chk_table_end(), - nul_chk_table_size()); -} - -void nmethod::print_code() { - HandleMark hm; - ResourceMark m; - Disassembler::decode(this); -} - - -#ifndef PRODUCT - -void nmethod::print_scopes() { - // Find the first pc desc for all scopes in the code and print it. - ResourceMark rm; - for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { - if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null) - continue; - - ScopeDesc* sd = scope_desc_at(p->real_pc(this)); - sd->print_on(tty, p); - } -} - -void nmethod::print_dependencies() { - ResourceMark rm; - ttyLocker ttyl; // keep the following output all in one block - tty->print_cr("Dependencies:"); - for (Dependencies::DepStream deps(this); deps.next(); ) { - deps.print_dependency(); - klassOop ctxk = deps.context_type(); - if (ctxk != NULL) { - Klass* k = Klass::cast(ctxk); - if (k->oop_is_instance() && ((instanceKlass*)k)->is_dependent_nmethod(this)) { - tty->print_cr(" [nmethod<=klass]%s", k->external_name()); - } - } - deps.log_dependency(); // put it into the xml log also - } -} - - -void nmethod::print_relocations() { - ResourceMark m; // in case methods get printed via the debugger - tty->print_cr("relocations:"); - RelocIterator iter(this); - iter.print(); - if (UseRelocIndex) { - jint* index_end = (jint*)relocation_end() - 1; - jint index_size = *index_end; - jint* index_start = (jint*)( (address)index_end - index_size ); - tty->print_cr(" index @" INTPTR_FORMAT ": index_size=%d", index_start, index_size); - if (index_size > 0) { - jint* ip; - for (ip = index_start; ip+2 <= index_end; ip += 2) - tty->print_cr(" (%d %d) addr=" INTPTR_FORMAT " @" INTPTR_FORMAT, - ip[0], - ip[1], - header_end()+ip[0], - relocation_begin()-1+ip[1]); - for (; ip < index_end; ip++) - tty->print_cr(" (%d ?)", ip[0]); - tty->print_cr(" @" INTPTR_FORMAT ": index_size=%d", ip, *ip++); - tty->print_cr("reloc_end @" INTPTR_FORMAT ":", ip); - } - } -} - - -void nmethod::print_pcs() { - ResourceMark m; // in case methods get printed via debugger - tty->print_cr("pc-bytecode offsets:"); - for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { - p->print(this); - } -} - -#endif // PRODUCT - -const char* nmethod::reloc_string_for(u_char* begin, u_char* end) { - RelocIterator iter(this, begin, end); - bool have_one = false; - while (iter.next()) { - have_one = true; - switch (iter.type()) { - case relocInfo::none: return "no_reloc"; - case relocInfo::oop_type: { - stringStream st; - oop_Relocation* r = iter.oop_reloc(); - oop obj = r->oop_value(); - st.print("oop("); - if (obj == NULL) st.print("NULL"); - else obj->print_value_on(&st); - st.print(")"); - return st.as_string(); - } - case relocInfo::virtual_call_type: return "virtual_call"; - case relocInfo::opt_virtual_call_type: return "optimized virtual_call"; - case relocInfo::static_call_type: return "static_call"; - case relocInfo::static_stub_type: return "static_stub"; - case relocInfo::runtime_call_type: return "runtime_call"; - case relocInfo::external_word_type: return "external_word"; - case relocInfo::internal_word_type: return "internal_word"; - case relocInfo::section_word_type: return "section_word"; - case relocInfo::poll_type: return "poll"; - case relocInfo::poll_return_type: return "poll_return"; - case relocInfo::type_mask: return "type_bit_mask"; - } - } - return have_one ? "other" : NULL; -} - -// Return a the last scope in (begin..end] -ScopeDesc* nmethod::scope_desc_in(address begin, address end) { - PcDesc* p = pc_desc_near(begin+1); - if (p != NULL && p->real_pc(this) <= end) { - return new ScopeDesc(this, p->scope_decode_offset(), - p->obj_decode_offset(), p->should_reexecute(), p->rethrow_exception(), - p->return_oop()); - } - return NULL; -} - -void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) { - if (block_begin == entry_point()) stream->print_cr("[Entry Point]"); - if (block_begin == verified_entry_point()) stream->print_cr("[Verified Entry Point]"); - if (GRAAL_ONLY(_exception_offset >= 0 &&) block_begin == exception_begin()) stream->print_cr("[Exception Handler]"); - if (block_begin == stub_begin()) stream->print_cr("[Stub Code]"); - if (GRAAL_ONLY(_deoptimize_offset >= 0 &&) block_begin == deopt_handler_begin()) stream->print_cr("[Deopt Handler Code]"); - - if (has_method_handle_invokes()) - if (block_begin == deopt_mh_handler_begin()) stream->print_cr("[Deopt MH Handler Code]"); - - if (block_begin == consts_begin()) stream->print_cr("[Constants]"); - - if (block_begin == entry_point()) { - methodHandle m = method(); - if (m.not_null()) { - stream->print(" # "); - m->print_value_on(stream); - stream->cr(); - } - if (m.not_null() && !is_osr_method()) { - ResourceMark rm; - int sizeargs = m->size_of_parameters(); - BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs); - VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs); - { - int sig_index = 0; - if (!m->is_static()) - sig_bt[sig_index++] = T_OBJECT; // 'this' - for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) { - BasicType t = ss.type(); - sig_bt[sig_index++] = t; - if (type2size[t] == 2) { - sig_bt[sig_index++] = T_VOID; - } else { - assert(type2size[t] == 1, "size is 1 or 2"); - } - } - assert(sig_index == sizeargs, ""); - } - const char* spname = "sp"; // make arch-specific? - intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false); - int stack_slot_offset = this->frame_size() * wordSize; - int tab1 = 14, tab2 = 24; - int sig_index = 0; - int arg_index = (m->is_static() ? 0 : -1); - bool did_old_sp = false; - for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) { - bool at_this = (arg_index == -1); - bool at_old_sp = false; - BasicType t = (at_this ? T_OBJECT : ss.type()); - assert(t == sig_bt[sig_index], "sigs in sync"); - if (at_this) - stream->print(" # this: "); - else - stream->print(" # parm%d: ", arg_index); - stream->move_to(tab1); - VMReg fst = regs[sig_index].first(); - VMReg snd = regs[sig_index].second(); - if (fst->is_reg()) { - stream->print("%s", fst->name()); - if (snd->is_valid()) { - stream->print(":%s", snd->name()); - } - } else if (fst->is_stack()) { - int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset; - if (offset == stack_slot_offset) at_old_sp = true; - stream->print("[%s+0x%x]", spname, offset); - } else { - stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd); - } - stream->print(" "); - stream->move_to(tab2); - stream->print("= "); - if (at_this) { - m->method_holder()->print_value_on(stream); - } else { - bool did_name = false; - if (!at_this && ss.is_object()) { - Symbol* name = ss.as_symbol_or_null(); - if (name != NULL) { - name->print_value_on(stream); - did_name = true; - } - } - if (!did_name) - stream->print("%s", type2name(t)); - } - if (at_old_sp) { - stream->print(" (%s of caller)", spname); - did_old_sp = true; - } - stream->cr(); - sig_index += type2size[t]; - arg_index += 1; - if (!at_this) ss.next(); - } - if (!did_old_sp) { - stream->print(" # "); - stream->move_to(tab1); - stream->print("[%s+0x%x]", spname, stack_slot_offset); - stream->print(" (%s of caller)", spname); - stream->cr(); - } - } - } -} - -void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) { - // First, find an oopmap in (begin, end]. - // We use the odd half-closed interval so that oop maps and scope descs - // which are tied to the byte after a call are printed with the call itself. - address base = code_begin(); - OopMapSet* oms = oop_maps(); - if (oms != NULL) { - for (int i = 0, imax = oms->size(); i < imax; i++) { - OopMap* om = oms->at(i); - address pc = base + om->offset(); - if (pc > begin) { - if (pc <= end) { - st->move_to(column); - st->print("; "); - om->print_on(st); - } - break; - } - } - } - - // Print any debug info present at this pc. - ScopeDesc* sd = scope_desc_in(begin, end); - if (sd != NULL) { - st->move_to(column); - if (sd->bci() == SynchronizationEntryBCI) { - st->print(";*synchronization entry"); - } else { - if (sd->method().is_null()) { - st->print("method is NULL"); - } else if (sd->method()->is_native()) { - st->print("method is native"); - } else { - Bytecodes::Code bc = sd->method()->java_code_at(sd->bci()); - st->print(";*%s", Bytecodes::name(bc)); - switch (bc) { - case Bytecodes::_invokevirtual: - case Bytecodes::_invokespecial: - case Bytecodes::_invokestatic: - case Bytecodes::_invokeinterface: - { - Bytecode_invoke invoke(sd->method(), sd->bci()); - st->print(" "); - if (invoke.name() != NULL) - invoke.name()->print_symbol_on(st); - else - st->print("<UNKNOWN>"); - break; - } - case Bytecodes::_getfield: - case Bytecodes::_putfield: - case Bytecodes::_getstatic: - case Bytecodes::_putstatic: - { - Bytecode_field field(sd->method(), sd->bci()); - st->print(" "); - if (field.name() != NULL) - field.name()->print_symbol_on(st); - else - st->print("<UNKNOWN>"); - } - } - } - } - - // Print all scopes - for (;sd != NULL; sd = sd->sender()) { - st->move_to(column); - st->print("; -"); - if (sd->method().is_null()) { - st->print("method is NULL"); - } else { - sd->method()->print_short_name(st); - } - int lineno = sd->method()->line_number_from_bci(sd->bci()); - if (lineno != -1) { - st->print("@%d (line %d)", sd->bci(), lineno); - } else { - st->print("@%d", sd->bci()); - } - st->cr(); - } - } - - // Print relocation information - const char* str = reloc_string_for(begin, end); - if (str != NULL) { - if (sd != NULL) st->cr(); - st->move_to(column); - st->print("; {%s}", str); - } - int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin()); - if (cont_offset != 0) { - st->move_to(column); - st->print("; implicit exception: dispatches to " INTPTR_FORMAT, code_begin() + cont_offset); - } - -} - -#ifndef PRODUCT - -void nmethod::print_value_on(outputStream* st) const { - st->print("nmethod"); - print_on(st, NULL); -} - -void nmethod::print_calls(outputStream* st) { - RelocIterator iter(this); - while (iter.next()) { - switch (iter.type()) { - case relocInfo::virtual_call_type: - case relocInfo::opt_virtual_call_type: { - VerifyMutexLocker mc(CompiledIC_lock); - CompiledIC_at(iter.reloc())->print(); - break; - } - case relocInfo::static_call_type: - st->print_cr("Static call at " INTPTR_FORMAT, iter.reloc()->addr()); - compiledStaticCall_at(iter.reloc())->print(); - break; - } - } -} - -void nmethod::print_handler_table() { - ExceptionHandlerTable(this).print(); -} - -void nmethod::print_nul_chk_table() { - ImplicitExceptionTable(this).print(code_begin()); -} - -#endif // PRODUCT - -void nmethod::print_statistics() { - ttyLocker ttyl; - if (xtty != NULL) xtty->head("statistics type='nmethod'"); - nmethod_stats.print_native_nmethod_stats(); - nmethod_stats.print_nmethod_stats(); - DebugInformationRecorder::print_statistics(); - nmethod_stats.print_pc_stats(); - Dependencies::print_statistics(); - if (xtty != NULL) xtty->tail("statistics"); -} + } + } + + // verify nmethod + debug_only(if (nm) nm->verify();) // might block + + if (nm != NULL) { + nm->log_new_nmethod(); + } + + // done + return nm; +} + + +// For native wrappers +nmethod::nmethod( + Method* method, + int nmethod_size, + int compile_id, + CodeOffsets* offsets, + CodeBuffer* code_buffer, + int frame_size, + ByteSize basic_lock_owner_sp_offset, + ByteSize basic_lock_sp_offset, + OopMapSet* oop_maps ) + : CodeBlob("native nmethod", code_buffer, sizeof(nmethod), + nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps), + _native_receiver_sp_offset(basic_lock_owner_sp_offset), + _native_basic_lock_sp_offset(basic_lock_sp_offset) +{ + { + debug_only(No_Safepoint_Verifier nsv;) + assert_locked_or_safepoint(CodeCache_lock); + + init_defaults(); + _method = method; + _entry_bci = InvocationEntryBci; + // We have no exception handler or deopt handler make the + // values something that will never match a pc like the nmethod vtable entry + _exception_offset = 0; + _deoptimize_offset = 0; + _deoptimize_mh_offset = 0; + _orig_pc_offset = 0; + + _consts_offset = data_offset(); + _stub_offset = data_offset(); + _oops_offset = data_offset(); + _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize); + _scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize); + _scopes_pcs_offset = _scopes_data_offset; + _dependencies_offset = _scopes_pcs_offset; + _handler_table_offset = _dependencies_offset; + _nul_chk_table_offset = _handler_table_offset; + _nmethod_end_offset = _nul_chk_table_offset; + _compile_id = compile_id; + _comp_level = CompLevel_none; + _entry_point = code_begin() + offsets->value(CodeOffsets::Entry); + _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry); + _osr_entry_point = NULL; + _exception_cache = NULL; + _pc_desc_cache.reset_to(NULL); + + code_buffer->copy_values_to(this); + if (ScavengeRootsInCode && detect_scavenge_root_oops()) { + CodeCache::add_scavenge_root_nmethod(this); + } + debug_only(verify_scavenge_root_oops()); + CodeCache::commit(this); + } + + if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) { + ttyLocker ttyl; // keep the following output all in one block + // This output goes directly to the tty, not the compiler log. + // To enable tools to match it up with the compilation activity, + // be sure to tag this tty output with the compile ID. + if (xtty != NULL) { + xtty->begin_head("print_native_nmethod"); + xtty->method(_method); + xtty->stamp(); + xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this); + } + // print the header part first + print(); + // then print the requested information + if (PrintNativeNMethods) { + print_code(); + if (oop_maps != NULL) { + oop_maps->print(); + } + } + if (PrintRelocations) { + print_relocations(); + } + if (xtty != NULL) { + xtty->tail("print_native_nmethod"); + } + } +} + +// For dtrace wrappers +#ifdef HAVE_DTRACE_H +nmethod::nmethod( + Method* method, + int nmethod_size, + CodeOffsets* offsets, + CodeBuffer* code_buffer, + int frame_size) + : CodeBlob("dtrace nmethod", code_buffer, sizeof(nmethod), + nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, NULL), + _native_receiver_sp_offset(in_ByteSize(-1)), + _native_basic_lock_sp_offset(in_ByteSize(-1)) +{ + { + debug_only(No_Safepoint_Verifier nsv;) + assert_locked_or_safepoint(CodeCache_lock); + + init_defaults(); + _method = method; + _entry_bci = InvocationEntryBci; + // We have no exception handler or deopt handler make the + // values something that will never match a pc like the nmethod vtable entry + _exception_offset = 0; + _deoptimize_offset = 0; + _deoptimize_mh_offset = 0; + _unwind_handler_offset = -1; + _trap_offset = offsets->value(CodeOffsets::Dtrace_trap); + _orig_pc_offset = 0; + _consts_offset = data_offset(); + _stub_offset = data_offset(); + _oops_offset = data_offset(); + _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize); + _scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize); + _scopes_pcs_offset = _scopes_data_offset; + _dependencies_offset = _scopes_pcs_offset; + _handler_table_offset = _dependencies_offset; + _nul_chk_table_offset = _handler_table_offset; + _nmethod_end_offset = _nul_chk_table_offset; + _compile_id = 0; // default + _comp_level = CompLevel_none; + _entry_point = code_begin() + offsets->value(CodeOffsets::Entry); + _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry); + _osr_entry_point = NULL; + _exception_cache = NULL; + _pc_desc_cache.reset_to(NULL); + + code_buffer->copy_values_to(this); + debug_only(verify_scavenge_root_oops()); + CodeCache::commit(this); + } + + if (PrintNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) { + ttyLocker ttyl; // keep the following output all in one block + // This output goes directly to the tty, not the compiler log. + // To enable tools to match it up with the compilation activity, + // be sure to tag this tty output with the compile ID. + if (xtty != NULL) { + xtty->begin_head("print_dtrace_nmethod"); + xtty->method(_method); + xtty->stamp(); + xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this); + } + // print the header part first + print(); + // then print the requested information + if (PrintNMethods) { + print_code(); + } + if (PrintRelocations) { + print_relocations(); + } + if (xtty != NULL) { + xtty->tail("print_dtrace_nmethod"); + } + } +} +#endif // def HAVE_DTRACE_H + +void* nmethod::operator new(size_t size, int nmethod_size) { + // Always leave some room in the CodeCache for I2C/C2I adapters + if (CodeCache::largest_free_block() < CodeCacheMinimumFreeSpace) return NULL; + return CodeCache::allocate(nmethod_size); +} + + +nmethod::nmethod( + Method* method, + int nmethod_size, + int compile_id, + int entry_bci, + CodeOffsets* offsets, + int orig_pc_offset, + DebugInformationRecorder* debug_info, + Dependencies* dependencies, + CodeBuffer *code_buffer, + int frame_size, + OopMapSet* oop_maps, + ExceptionHandlerTable* handler_table, + ImplicitExceptionTable* nul_chk_table, + AbstractCompiler* compiler, + int comp_level +#ifdef GRAAL + , Handle installed_code +#endif + ) + : CodeBlob("nmethod", code_buffer, sizeof(nmethod), + nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps), + _native_receiver_sp_offset(in_ByteSize(-1)), + _native_basic_lock_sp_offset(in_ByteSize(-1)) +{ + assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR"); + { + debug_only(No_Safepoint_Verifier nsv;) + assert_locked_or_safepoint(CodeCache_lock); + + init_defaults(); + _method = method; + _entry_bci = entry_bci; + _compile_id = compile_id; + _comp_level = comp_level; + _compiler = compiler; + _orig_pc_offset = orig_pc_offset; + + // Section offsets + _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts()); + _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs()); + +#ifdef GRAAL + _graal_installed_code = installed_code(); + + // graal produces no (!) stub section + if (offsets->value(CodeOffsets::Exceptions) != -1) { + _exception_offset = code_offset() + offsets->value(CodeOffsets::Exceptions); + } else { + _exception_offset = -1; + } + if (offsets->value(CodeOffsets::Deopt) != -1) { + _deoptimize_offset = code_offset() + offsets->value(CodeOffsets::Deopt); + } else { + _deoptimize_offset = -1; + } + if (offsets->value(CodeOffsets::DeoptMH) != -1) { + _deoptimize_mh_offset = code_offset() + offsets->value(CodeOffsets::DeoptMH); + } else { + _deoptimize_mh_offset = -1; + } +#else + // Exception handler and deopt handler are in the stub section + assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set"); + assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set"); + + _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions); + _deoptimize_offset = _stub_offset + offsets->value(CodeOffsets::Deopt); + if (offsets->value(CodeOffsets::DeoptMH) != -1) { + _deoptimize_mh_offset = _stub_offset + offsets->value(CodeOffsets::DeoptMH); + } else { + _deoptimize_mh_offset = -1; + } +#endif + if (offsets->value(CodeOffsets::UnwindHandler) != -1) { + _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler); + } else { + _unwind_handler_offset = -1; + } + + _oops_offset = data_offset(); + _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize); + _scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize); + + _scopes_pcs_offset = _scopes_data_offset + round_to(debug_info->data_size (), oopSize); + _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size()); + _handler_table_offset = _dependencies_offset + round_to(dependencies->size_in_bytes (), oopSize); + _nul_chk_table_offset = _handler_table_offset + round_to(handler_table->size_in_bytes(), oopSize); + _nmethod_end_offset = _nul_chk_table_offset + round_to(nul_chk_table->size_in_bytes(), oopSize); + + _entry_point = code_begin() + offsets->value(CodeOffsets::Entry); + _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry); + _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry); + _exception_cache = NULL; + _pc_desc_cache.reset_to(scopes_pcs_begin()); + + // Copy contents of ScopeDescRecorder to nmethod + code_buffer->copy_values_to(this); + debug_info->copy_to(this); + dependencies->copy_to(this); + if (ScavengeRootsInCode && detect_scavenge_root_oops()) { + CodeCache::add_scavenge_root_nmethod(this); + } + debug_only(verify_scavenge_root_oops()); + + CodeCache::commit(this); + + // Copy contents of ExceptionHandlerTable to nmethod + handler_table->copy_to(this); + nul_chk_table->copy_to(this); + + // we use the information of entry points to find out if a method is + // static or non static + assert(compiler->is_c2() || + _method->is_static() == (entry_point() == _verified_entry_point), + " entry points must be same for static methods and vice versa"); + } + + bool printnmethods = PrintNMethods + || CompilerOracle::should_print(_method) + || CompilerOracle::has_option_string(_method, "PrintNMethods"); + if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) { + print_nmethod(printnmethods); + } +} + + +// Print a short set of xml attributes to identify this nmethod. The +// output should be embedded in some other element. +void nmethod::log_identity(xmlStream* log) const { + log->print(" compile_id='%d'", compile_id()); + const char* nm_kind = compile_kind(); + if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind); + if (compiler() != NULL) { + log->print(" compiler='%s'", compiler()->name()); + } + if (TieredCompilation) { + log->print(" level='%d'", comp_level()); + } +} + + +#define LOG_OFFSET(log, name) \ + if ((intptr_t)name##_end() - (intptr_t)name##_begin()) \ + log->print(" " XSTR(name) "_offset='%d'" , \ + (intptr_t)name##_begin() - (intptr_t)this) + + +void nmethod::log_new_nmethod() const { + if (LogCompilation && xtty != NULL) { + ttyLocker ttyl; + HandleMark hm; + xtty->begin_elem("nmethod"); + log_identity(xtty); + xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", code_begin(), size()); + xtty->print(" address='" INTPTR_FORMAT "'", (intptr_t) this); + + LOG_OFFSET(xtty, relocation); + LOG_OFFSET(xtty, consts); + LOG_OFFSET(xtty, insts); + LOG_OFFSET(xtty, stub); + LOG_OFFSET(xtty, scopes_data); + LOG_OFFSET(xtty, scopes_pcs); + LOG_OFFSET(xtty, dependencies); + LOG_OFFSET(xtty, handler_table); + LOG_OFFSET(xtty, nul_chk_table); + LOG_OFFSET(xtty, oops); + + xtty->method(method()); + xtty->stamp(); + xtty->end_elem(); + } +} + +#undef LOG_OFFSET + + +// Print out more verbose output usually for a newly created nmethod. +void nmethod::print_on(outputStream* st, const char* msg) const { + if (st != NULL) { + ttyLocker ttyl; + if (WizardMode) { + CompileTask::print_compilation(st, this, msg, /*short_form:*/ true); + st->print_cr(" (" INTPTR_FORMAT ")", this); + } else { + CompileTask::print_compilation(st, this, msg, /*short_form:*/ false); + } + } +} + + +void nmethod::print_nmethod(bool printmethod) { + ttyLocker ttyl; // keep the following output all in one block + if (xtty != NULL) { + xtty->begin_head("print_nmethod"); + xtty->stamp(); + xtty->end_head(); + } + // print the header part first + print(); + // then print the requested information + if (printmethod) { + print_code(); + print_pcs(); + if (oop_maps()) { + oop_maps()->print(); + } + } + if (PrintDebugInfo) { + print_scopes(); + } + if (PrintRelocations) { + print_relocations(); + } + if (PrintDependencies) { + print_dependencies(); + } + if (PrintExceptionHandlers) { + print_handler_table(); + print_nul_chk_table(); + } + if (xtty != NULL) { + xtty->tail("print_nmethod"); + } +} + + +// Promote one word from an assembly-time handle to a live embedded oop. +inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) { + if (handle == NULL || + // As a special case, IC oops are initialized to 1 or -1. + handle == (jobject) Universe::non_oop_word()) { + (*dest) = (oop) handle; + } else { + (*dest) = JNIHandles::resolve_non_null(handle); + } +} + + +// Have to have the same name because it's called by a template +void nmethod::copy_values(GrowableArray<jobject>* array) { + int length = array->length(); + assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough"); + oop* dest = oops_begin(); + for (int index = 0 ; index < length; index++) { + initialize_immediate_oop(&dest[index], array->at(index)); + } + + // Now we can fix up all the oops in the code. We need to do this + // in the code because the assembler uses jobjects as placeholders. + // The code and relocations have already been initialized by the + // CodeBlob constructor, so it is valid even at this early point to + // iterate over relocations and patch the code. + fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true); +} + +void nmethod::copy_values(GrowableArray<Metadata*>* array) { + int length = array->length(); + assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough"); + Metadata** dest = metadata_begin(); + for (int index = 0 ; index < length; index++) { + dest[index] = array->at(index); + } +} + +bool nmethod::is_at_poll_return(address pc) { + RelocIterator iter(this, pc, pc+1); + while (iter.next()) { + if (iter.type() == relocInfo::poll_return_type) + return true; + } + return false; +} + + +bool nmethod::is_at_poll_or_poll_return(address pc) { + RelocIterator iter(this, pc, pc+1); + while (iter.next()) { + relocInfo::relocType t = iter.type(); + if (t == relocInfo::poll_return_type || t == relocInfo::poll_type) + return true; + } + return false; +} + + +void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) { + // re-patch all oop-bearing instructions, just in case some oops moved + RelocIterator iter(this, begin, end); + while (iter.next()) { + if (iter.type() == relocInfo::oop_type) { + oop_Relocation* reloc = iter.oop_reloc(); + if (initialize_immediates && reloc->oop_is_immediate()) { + oop* dest = reloc->oop_addr(); + initialize_immediate_oop(dest, (jobject) *dest); + } + // Refresh the oop-related bits of this instruction. + reloc->fix_oop_relocation(); + } else if (iter.type() == relocInfo::metadata_type) { + metadata_Relocation* reloc = iter.metadata_reloc(); + reloc->fix_metadata_relocation(); + } + + // There must not be any interfering patches or breakpoints. + assert(!(iter.type() == relocInfo::breakpoint_type + && iter.breakpoint_reloc()->active()), + "no active breakpoint"); + } +} + + +void nmethod::verify_oop_relocations() { + // Ensure sure that the code matches the current oop values + RelocIterator iter(this, NULL, NULL); + while (iter.next()) { + if (iter.type() == relocInfo::oop_type) { + oop_Relocation* reloc = iter.oop_reloc(); + if (!reloc->oop_is_immediate()) { + reloc->verify_oop_relocation(); + } + } + } +} + + +ScopeDesc* nmethod::scope_desc_at(address pc) { + PcDesc* pd = pc_desc_at(pc); + guarantee(pd != NULL, "scope must be present"); + return new ScopeDesc(this, pd->scope_decode_offset(), + pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(), + pd->return_oop()); +} + + +void nmethod::clear_inline_caches() { + assert(SafepointSynchronize::is_at_safepoint(), "cleaning of IC's only allowed at safepoint"); + if (is_zombie()) { + return; + } + + RelocIterator iter(this); + while (iter.next()) { + iter.reloc()->clear_inline_cache(); + } +} + + +void nmethod::cleanup_inline_caches() { + + assert_locked_or_safepoint(CompiledIC_lock); + + // If the method is not entrant or zombie then a JMP is plastered over the + // first few bytes. If an oop in the old code was there, that oop + // should not get GC'd. Skip the first few bytes of oops on + // not-entrant methods. + address low_boundary = verified_entry_point(); + if (!is_in_use()) { + low_boundary += NativeJump::instruction_size; + // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. + // This means that the low_boundary is going to be a little too high. + // This shouldn't matter, since oops of non-entrant methods are never used. + // In fact, why are we bothering to look at oops in a non-entrant method?? + } + + // Find all calls in an nmethod, and clear the ones that points to zombie methods + ResourceMark rm; + RelocIterator iter(this, low_boundary); + while(iter.next()) { + switch(iter.type()) { + case relocInfo::virtual_call_type: + case relocInfo::opt_virtual_call_type: { + CompiledIC *ic = CompiledIC_at(iter.reloc()); + // Ok, to lookup references to zombies here + CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination()); + if( cb != NULL && cb->is_nmethod() ) { + nmethod* nm = (nmethod*)cb; + // Clean inline caches pointing to both zombie and not_entrant methods + if (!nm->is_in_use() || (nm->method()->code() != nm)) ic->set_to_clean(); + } + break; + } + case relocInfo::static_call_type: { + CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc()); + CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination()); + if( cb != NULL && cb->is_nmethod() ) { + nmethod* nm = (nmethod*)cb; + // Clean inline caches pointing to both zombie and not_entrant methods + if (!nm->is_in_use() || (nm->method()->code() != nm)) csc->set_to_clean(); + } + break; + } + } + } +} + +// This is a private interface with the sweeper. +void nmethod::mark_as_seen_on_stack() { + assert(is_not_entrant(), "must be a non-entrant method"); + // Set the traversal mark to ensure that the sweeper does 2 + // cleaning passes before moving to zombie. + set_stack_traversal_mark(NMethodSweeper::traversal_count()); +} + +// Tell if a non-entrant method can be converted to a zombie (i.e., +// there are no activations on the stack, not in use by the VM, +// and not in use by the ServiceThread) +bool nmethod::can_not_entrant_be_converted() { + assert(is_not_entrant(), "must be a non-entrant method"); + + // Since the nmethod sweeper only does partial sweep the sweeper's traversal + // count can be greater than the stack traversal count before it hits the + // nmethod for the second time. + return stack_traversal_mark()+1 < NMethodSweeper::traversal_count() && + !is_locked_by_vm(); +} + +void nmethod::inc_decompile_count() { +#ifndef GRAAL + if (!is_compiled_by_c2()) return; +#endif + // Could be gated by ProfileTraps, but do not bother... + Method* m = method(); + if (m == NULL) return; + MethodData* mdo = m->method_data(); + if (mdo == NULL) return; + // There is a benign race here. See comments in methodData.hpp. + mdo->inc_decompile_count(); +} + +void nmethod::make_unloaded(BoolObjectClosure* is_alive, oop cause) { + + post_compiled_method_unload(); + + // Since this nmethod is being unloaded, make sure that dependencies + // recorded in instanceKlasses get flushed and pass non-NULL closure to + // indicate that this work is being done during a GC. + assert(Universe::heap()->is_gc_active(), "should only be called during gc"); + assert(is_alive != NULL, "Should be non-NULL"); + // A non-NULL is_alive closure indicates that this is being called during GC. + flush_dependencies(is_alive); + + // Break cycle between nmethod & method + if (TraceClassUnloading && WizardMode) { + tty->print_cr("[Class unloading: Making nmethod " INTPTR_FORMAT + " unloadable], Method*(" INTPTR_FORMAT + "), cause(" INTPTR_FORMAT ")", + this, (address)_method, (address)cause); + if (!Universe::heap()->is_gc_active()) + cause->klass()->print(); + } + // Unlink the osr method, so we do not look this up again + if (is_osr_method()) { + invalidate_osr_method(); + } + // If _method is already NULL the Method* is about to be unloaded, + // so we don't have to break the cycle. Note that it is possible to + // have the Method* live here, in case we unload the nmethod because + // it is pointing to some oop (other than the Method*) being unloaded. + if (_method != NULL) { + // OSR methods point to the Method*, but the Method* does not + // point back! + if (_method->code() == this) { + _method->clear_code(); // Break a cycle + } + _method = NULL; // Clear the method of this dead nmethod + } + +#ifdef GRAAL + if (_graal_installed_code != NULL) { + HotSpotInstalledCode::set_nmethod(_graal_installed_code, 0); + _graal_installed_code = NULL; + } +#endif + + // Make the class unloaded - i.e., change state and notify sweeper + assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); + if (is_in_use()) { + // Transitioning directly from live to unloaded -- so + // we need to force a cache clean-up; remember this + // for later on. + CodeCache::set_needs_cache_clean(true); + } + _state = unloaded; + + // Log the unloading. + log_state_change(); + + // The Method* is gone at this point + assert(_method == NULL, "Tautology"); + + set_osr_link(NULL); + //set_scavenge_root_link(NULL); // done by prune_scavenge_root_nmethods + NMethodSweeper::notify(this); +} + +void nmethod::invalidate_osr_method() { + assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); + // Remove from list of active nmethods + if (method() != NULL) + method()->method_holder()->remove_osr_nmethod(this); + // Set entry as invalid + _entry_bci = InvalidOSREntryBci; +} + +void nmethod::log_state_change() const { + if (LogCompilation) { + if (xtty != NULL) { + ttyLocker ttyl; // keep the following output all in one block + if (_state == unloaded) { + xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'", + os::current_thread_id()); + } else { + xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s", + os::current_thread_id(), + (_state == zombie ? " zombie='1'" : "")); + } + log_identity(xtty); + xtty->stamp(); + xtty->end_elem(); + } + } + if (PrintCompilation && _state != unloaded) { + print_on(tty, _state == zombie ? "made zombie" : "made not entrant"); + } +} + +// Common functionality for both make_not_entrant and make_zombie +bool nmethod::make_not_entrant_or_zombie(unsigned int state) { + assert(state == zombie || state == not_entrant, "must be zombie or not_entrant"); + assert(!is_zombie(), "should not already be a zombie"); + + // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below. + nmethodLocker nml(this); + methodHandle the_method(method()); + No_Safepoint_Verifier nsv; + + { + // invalidate osr nmethod before acquiring the patching lock since + // they both acquire leaf locks and we don't want a deadlock. + // This logic is equivalent to the logic below for patching the + // verified entry point of regular methods. + if (is_osr_method()) { + // this effectively makes the osr nmethod not entrant + invalidate_osr_method(); + } + + // Enter critical section. Does not block for safepoint. + MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); + + if (_state == state) { + // another thread already performed this transition so nothing + // to do, but return false to indicate this. + return false; + } + +#ifdef GRAAL + if (_graal_installed_code != NULL) { + HotSpotInstalledCode::set_nmethod(_graal_installed_code, 0); + _graal_installed_code = NULL; + } +#endif + + // The caller can be calling the method statically or through an inline + // cache call. + if (!is_osr_method() && !is_not_entrant()) { + NativeJump::patch_verified_entry(entry_point(), verified_entry_point(), + SharedRuntime::get_handle_wrong_method_stub()); + } + + if (is_in_use()) { + // It's a true state change, so mark the method as decompiled. + // Do it only for transition from alive. + inc_decompile_count(); + } + + // Change state + _state = state; + + // Log the transition once + log_state_change(); + + // Remove nmethod from method. + // We need to check if both the _code and _from_compiled_code_entry_point + // refer to this nmethod because there is a race in setting these two fields + // in Method* as seen in bugid 4947125. + // If the vep() points to the zombie nmethod, the memory for the nmethod + // could be flushed and the compiler and vtable stubs could still call + // through it. + if (method() != NULL && (method()->code() == this || + method()->from_compiled_entry() == verified_entry_point())) { + HandleMark hm; + method()->clear_code(); + } + + if (state == not_entrant) { + mark_as_seen_on_stack(); + } + + } // leave critical region under Patching_lock + + // When the nmethod becomes zombie it is no longer alive so the + // dependencies must be flushed. nmethods in the not_entrant + // state will be flushed later when the transition to zombie + // happens or they get unloaded. + if (state == zombie) { + { + // Flushing dependecies must be done before any possible + // safepoint can sneak in, otherwise the oops used by the + // dependency logic could have become stale. + MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); + flush_dependencies(NULL); + } + + // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload + // event and it hasn't already been reported for this nmethod then + // report it now. The event may have been reported earilier if the GC + // marked it for unloading). JvmtiDeferredEventQueue support means + // we no longer go to a safepoint here. + post_compiled_method_unload(); + +#ifdef ASSERT + // It's no longer safe to access the oops section since zombie + // nmethods aren't scanned for GC. + _oops_are_stale = true; +#endif + } else { + assert(state == not_entrant, "other cases may need to be handled differently"); + } + + if (TraceCreateZombies) { + tty->print_cr("nmethod <" INTPTR_FORMAT "> code made %s", this, (state == not_entrant) ? "not entrant" : "zombie"); + } + + // Make sweeper aware that there is a zombie method that needs to be removed + NMethodSweeper::notify(this); + + return true; +} + +void nmethod::flush() { + // Note that there are no valid oops in the nmethod anymore. + assert(is_zombie() || (is_osr_method() && is_unloaded()), "must be a zombie method"); + assert(is_marked_for_reclamation() || (is_osr_method() && is_unloaded()), "must be marked for reclamation"); + + assert (!is_locked_by_vm(), "locked methods shouldn't be flushed"); + assert_locked_or_safepoint(CodeCache_lock); + + // completely deallocate this method + Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, this); + if (PrintMethodFlushing) { + tty->print_cr("*flushing nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT "/Free CodeCache:" SIZE_FORMAT "Kb", + _compile_id, this, CodeCache::nof_blobs(), CodeCache::unallocated_capacity()/1024); + } + + // We need to deallocate any ExceptionCache data. + // Note that we do not need to grab the nmethod lock for this, it + // better be thread safe if we're disposing of it! + ExceptionCache* ec = exception_cache(); + set_exception_cache(NULL); + while(ec != NULL) { + ExceptionCache* next = ec->next(); + delete ec; + ec = next; + } + + if (on_scavenge_root_list()) { + CodeCache::drop_scavenge_root_nmethod(this); + } + + if (is_speculatively_disconnected()) { + CodeCache::remove_saved_code(this); + } + +#ifdef SHARK + ((SharkCompiler *) compiler())->free_compiled_method(insts_begin()); +#endif // SHARK + + ((CodeBlob*)(this))->flush(); + + CodeCache::free(this); +} + + +// +// Notify all classes this nmethod is dependent on that it is no +// longer dependent. This should only be called in two situations. +// First, when a nmethod transitions to a zombie all dependents need +// to be clear. Since zombification happens at a safepoint there's no +// synchronization issues. The second place is a little more tricky. +// During phase 1 of mark sweep class unloading may happen and as a +// result some nmethods may get unloaded. In this case the flushing +// of dependencies must happen during phase 1 since after GC any +// dependencies in the unloaded nmethod won't be updated, so +// traversing the dependency information in unsafe. In that case this +// function is called with a non-NULL argument and this function only +// notifies instanceKlasses that are reachable + +void nmethod::flush_dependencies(BoolObjectClosure* is_alive) { + assert_locked_or_safepoint(CodeCache_lock); + assert(Universe::heap()->is_gc_active() == (is_alive != NULL), + "is_alive is non-NULL if and only if we are called during GC"); + if (!has_flushed_dependencies()) { + set_has_flushed_dependencies(); + for (Dependencies::DepStream deps(this); deps.next(); ) { + Klass* klass = deps.context_type(); + if (klass == NULL) continue; // ignore things like evol_method + + // During GC the is_alive closure is non-NULL, and is used to + // determine liveness of dependees that need to be updated. + if (is_alive == NULL || klass->is_loader_alive(is_alive)) { + InstanceKlass::cast(klass)->remove_dependent_nmethod(this); + } + } + } +} + + +// If this oop is not live, the nmethod can be unloaded. +bool nmethod::can_unload(BoolObjectClosure* is_alive, oop* root, bool unloading_occurred) { + assert(root != NULL, "just checking"); + oop obj = *root; + if (obj == NULL || is_alive->do_object_b(obj)) { + return false; + } + + // If ScavengeRootsInCode is true, an nmethod might be unloaded + // simply because one of its constant oops has gone dead. + // No actual classes need to be unloaded in order for this to occur. + assert(unloading_occurred || ScavengeRootsInCode, "Inconsistency in unloading"); + make_unloaded(is_alive, obj); + return true; +} + +// ------------------------------------------------------------------ +// post_compiled_method_load_event +// new method for install_code() path +// Transfer information from compilation to jvmti +void nmethod::post_compiled_method_load_event() { + + Method* moop = method(); +#ifndef USDT2 + HS_DTRACE_PROBE8(hotspot, compiled__method__load, + moop->klass_name()->bytes(), + moop->klass_name()->utf8_length(), + moop->name()->bytes(), + moop->name()->utf8_length(), + moop->signature()->bytes(), + moop->signature()->utf8_length(), + insts_begin(), insts_size()); +#else /* USDT2 */ + HOTSPOT_COMPILED_METHOD_LOAD( + (char *) moop->klass_name()->bytes(), + moop->klass_name()->utf8_length(), + (char *) moop->name()->bytes(), + moop->name()->utf8_length(), + (char *) moop->signature()->bytes(), + moop->signature()->utf8_length(), + insts_begin(), insts_size()); +#endif /* USDT2 */ + + if (JvmtiExport::should_post_compiled_method_load() || + JvmtiExport::should_post_compiled_method_unload()) { + get_and_cache_jmethod_id(); + } + + if (JvmtiExport::should_post_compiled_method_load()) { + // Let the Service thread (which is a real Java thread) post the event + MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); + JvmtiDeferredEventQueue::enqueue( + JvmtiDeferredEvent::compiled_method_load_event(this)); + } +} + +jmethodID nmethod::get_and_cache_jmethod_id() { + if (_jmethod_id == NULL) { + // Cache the jmethod_id since it can no longer be looked up once the + // method itself has been marked for unloading. + _jmethod_id = method()->jmethod_id(); + } + return _jmethod_id; +} + +void nmethod::post_compiled_method_unload() { + if (unload_reported()) { + // During unloading we transition to unloaded and then to zombie + // and the unloading is reported during the first transition. + return; + } + + assert(_method != NULL && !is_unloaded(), "just checking"); + DTRACE_METHOD_UNLOAD_PROBE(method()); + + // If a JVMTI agent has enabled the CompiledMethodUnload event then + // post the event. Sometime later this nmethod will be made a zombie + // by the sweeper but the Method* will not be valid at that point. + // If the _jmethod_id is null then no load event was ever requested + // so don't bother posting the unload. The main reason for this is + // that the jmethodID is a weak reference to the Method* so if + // it's being unloaded there's no way to look it up since the weak + // ref will have been cleared. + if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) { + assert(!unload_reported(), "already unloaded"); + JvmtiDeferredEvent event = + JvmtiDeferredEvent::compiled_method_unload_event(this, + _jmethod_id, insts_begin()); + if (SafepointSynchronize::is_at_safepoint()) { + // Don't want to take the queueing lock. Add it as pending and + // it will get enqueued later. + JvmtiDeferredEventQueue::add_pending_event(event); + } else { + MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); + JvmtiDeferredEventQueue::enqueue(event); + } + } + + // The JVMTI CompiledMethodUnload event can be enabled or disabled at + // any time. As the nmethod is being unloaded now we mark it has + // having the unload event reported - this will ensure that we don't + // attempt to report the event in the unlikely scenario where the + // event is enabled at the time the nmethod is made a zombie. + set_unload_reported(); +} + +// This is called at the end of the strong tracing/marking phase of a +// GC to unload an nmethod if it contains otherwise unreachable +// oops. + +void nmethod::do_unloading(BoolObjectClosure* is_alive, bool unloading_occurred) { + // Make sure the oop's ready to receive visitors + assert(!is_zombie() && !is_unloaded(), + "should not call follow on zombie or unloaded nmethod"); + + // If the method is not entrant then a JMP is plastered over the + // first few bytes. If an oop in the old code was there, that oop + // should not get GC'd. Skip the first few bytes of oops on + // not-entrant methods. + address low_boundary = verified_entry_point(); + if (is_not_entrant()) { + low_boundary += NativeJump::instruction_size; + // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. + // (See comment above.) + } + + // The RedefineClasses() API can cause the class unloading invariant + // to no longer be true. See jvmtiExport.hpp for details. + // Also, leave a debugging breadcrumb in local flag. + bool a_class_was_redefined = JvmtiExport::has_redefined_a_class(); + if (a_class_was_redefined) { + // This set of the unloading_occurred flag is done before the + // call to post_compiled_method_unload() so that the unloading + // of this nmethod is reported. + unloading_occurred = true; + } + +#ifdef GRAAL + // Follow Graal method + if (_graal_installed_code != NULL && can_unload(is_alive, (oop*)&_graal_installed_code, unloading_occurred)) { + return; + } +#endif + + // Exception cache + ExceptionCache* ec = exception_cache(); + while (ec != NULL) { + Klass* ex_klass = ec->exception_type(); + ExceptionCache* next_ec = ec->next(); + if (ex_klass != NULL && !ex_klass->is_loader_alive(is_alive)) { + remove_from_exception_cache(ec); + } + ec = next_ec; + } + + // If class unloading occurred we first iterate over all inline caches and + // clear ICs where the cached oop is referring to an unloaded klass or method. + // The remaining live cached oops will be traversed in the relocInfo::oop_type + // iteration below. + if (unloading_occurred) { + RelocIterator iter(this, low_boundary); + while(iter.next()) { + if (iter.type() == relocInfo::virtual_call_type) { + CompiledIC *ic = CompiledIC_at(iter.reloc()); + if (ic->is_icholder_call()) { + // The only exception is compiledICHolder oops which may + // yet be marked below. (We check this further below). + CompiledICHolder* cichk_oop = ic->cached_icholder(); + if (cichk_oop->holder_method()->method_holder()->is_loader_alive(is_alive) && + cichk_oop->holder_klass()->is_loader_alive(is_alive)) { + continue; + } + } else { + Metadata* ic_oop = ic->cached_metadata(); + if (ic_oop != NULL) { + if (ic_oop->is_klass()) { + if (((Klass*)ic_oop)->is_loader_alive(is_alive)) { + continue; + } + } else if (ic_oop->is_method()) { + if (((Method*)ic_oop)->method_holder()->is_loader_alive(is_alive)) { + continue; + } + } else { + ShouldNotReachHere(); + } + } + } + ic->set_to_clean(); + } + } + } + + // Compiled code + { + RelocIterator iter(this, low_boundary); + while (iter.next()) { + if (iter.type() == relocInfo::oop_type) { + oop_Relocation* r = iter.oop_reloc(); + // In this loop, we must only traverse those oops directly embedded in + // the code. Other oops (oop_index>0) are seen as part of scopes_oops. + assert(1 == (r->oop_is_immediate()) + + (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), + "oop must be found in exactly one place"); + if (r->oop_is_immediate() && r->oop_value() != NULL) { + if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) { + return; + } + } + } + } + } + + + // Scopes + for (oop* p = oops_begin(); p < oops_end(); p++) { + if (*p == Universe::non_oop_word()) continue; // skip non-oops + if (can_unload(is_alive, p, unloading_occurred)) { + return; + } + } + + // Ensure that all metadata is still alive + verify_metadata_loaders(low_boundary, is_alive); +} + +#ifdef ASSERT + +class CheckClass : AllStatic { + static BoolObjectClosure* _is_alive; + + // Check class_loader is alive for this bit of metadata. + static void check_class(Metadata* md) { + Klass* klass = NULL; + if (md->is_klass()) { + klass = ((Klass*)md); + } else if (md->is_method()) { + klass = ((Method*)md)->method_holder(); + } else if (md->is_methodData()) { + klass = ((MethodData*)md)->method()->method_holder(); + } else { + md->print(); + ShouldNotReachHere(); + } + assert(klass->is_loader_alive(_is_alive), "must be alive"); + } + public: + static void do_check_class(BoolObjectClosure* is_alive, nmethod* nm) { + assert(SafepointSynchronize::is_at_safepoint(), "this is only ok at safepoint"); + _is_alive = is_alive; + nm->metadata_do(check_class); + } +}; + +// This is called during a safepoint so can use static data +BoolObjectClosure* CheckClass::_is_alive = NULL; +#endif // ASSERT + + +// Processing of oop references should have been sufficient to keep +// all strong references alive. Any weak references should have been +// cleared as well. Visit all the metadata and ensure that it's +// really alive. +void nmethod::verify_metadata_loaders(address low_boundary, BoolObjectClosure* is_alive) { +#ifdef ASSERT + RelocIterator iter(this, low_boundary); + while (iter.next()) { + // static_stub_Relocations may have dangling references to + // Method*s so trim them out here. Otherwise it looks like + // compiled code is maintaining a link to dead metadata. + address static_call_addr = NULL; + if (iter.type() == relocInfo::opt_virtual_call_type) { + CompiledIC* cic = CompiledIC_at(iter.reloc()); + if (!cic->is_call_to_interpreted()) { + static_call_addr = iter.addr(); + cic->set_to_clean(); + } + } else if (iter.type() == relocInfo::static_call_type) { + CompiledStaticCall* csc = compiledStaticCall_at(iter.reloc()); + if (!csc->is_call_to_interpreted()) { + static_call_addr = iter.addr(); + csc->set_to_clean(); + } + } + if (static_call_addr != NULL) { + RelocIterator sciter(this, low_boundary); + while (sciter.next()) { + if (sciter.type() == relocInfo::static_stub_type && + sciter.static_stub_reloc()->static_call() == static_call_addr) { + sciter.static_stub_reloc()->clear_inline_cache(); + } + } + } + } + // Check that the metadata embedded in the nmethod is alive + CheckClass::do_check_class(is_alive, this); +#endif +} + + +// Iterate over metadata calling this function. Used by RedefineClasses +void nmethod::metadata_do(void f(Metadata*)) { + address low_boundary = verified_entry_point(); + if (is_not_entrant()) { + low_boundary += NativeJump::instruction_size; + // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. + // (See comment above.) + } + { + // Visit all immediate references that are embedded in the instruction stream. + RelocIterator iter(this, low_boundary); + while (iter.next()) { + if (iter.type() == relocInfo::metadata_type ) { + metadata_Relocation* r = iter.metadata_reloc(); + // In this lmetadata, we must only follow those metadatas directly embedded in + // the code. Other metadatas (oop_index>0) are seen as part of + // the metadata section below. + assert(1 == (r->metadata_is_immediate()) + + (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()), + "metadata must be found in exactly one place"); + if (r->metadata_is_immediate() && r->metadata_value() != NULL) { + Metadata* md = r->metadata_value(); + f(md); + } + } + } + } + + // Visit the metadata section + for (Metadata** p = metadata_begin(); p < metadata_end(); p++) { + if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops + Metadata* md = *p; + f(md); + } + // Call function Method*, not embedded in these other places. + if (_method != NULL) f(_method); +} + + +// This method is called twice during GC -- once while +// tracing the "active" nmethods on thread stacks during +// the (strong) marking phase, and then again when walking +// the code cache contents during the weak roots processing +// phase. The two uses are distinguished by means of the +// 'do_strong_roots_only' flag, which is true in the first +// case. We want to walk the weak roots in the nmethod +// only in the second case. The weak roots in the nmethod +// are the oops in the ExceptionCache and the InlineCache +// oops. +void nmethod::oops_do(OopClosure* f, bool do_strong_roots_only) { + // make sure the oops ready to receive visitors + assert(!is_zombie() && !is_unloaded(), + "should not call follow on zombie or unloaded nmethod"); + + // If the method is not entrant or zombie then a JMP is plastered over the + // first few bytes. If an oop in the old code was there, that oop + // should not get GC'd. Skip the first few bytes of oops on + // not-entrant methods. + address low_boundary = verified_entry_point(); + if (is_not_entrant()) { + low_boundary += NativeJump::instruction_size; + // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. + // (See comment above.) + } + +#ifdef GRAAL + if (_graal_installed_code != NULL) { + f->do_oop((oop*) &_graal_installed_code); + } +#endif + + RelocIterator iter(this, low_boundary); + + while (iter.next()) { + if (iter.type() == relocInfo::oop_type ) { + oop_Relocation* r = iter.oop_reloc(); + // In this loop, we must only follow those oops directly embedded in + // the code. Other oops (oop_index>0) are seen as part of scopes_oops. + assert(1 == (r->oop_is_immediate()) + + (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), + "oop must be found in exactly one place"); + if (r->oop_is_immediate() && r->oop_value() != NULL) { + f->do_oop(r->oop_addr()); + } + } + } + + // Scopes + // This includes oop constants not inlined in the code stream. + for (oop* p = oops_begin(); p < oops_end(); p++) { + if (*p == Universe::non_oop_word()) continue; // skip non-oops + f->do_oop(p); + } +} + +#define NMETHOD_SENTINEL ((nmethod*)badAddress) + +nmethod* volatile nmethod::_oops_do_mark_nmethods; + +// An nmethod is "marked" if its _mark_link is set non-null. +// Even if it is the end of the linked list, it will have a non-null link value, +// as long as it is on the list. +// This code must be MP safe, because it is used from parallel GC passes. +bool nmethod::test_set_oops_do_mark() { + assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called"); + nmethod* observed_mark_link = _oops_do_mark_link; + if (observed_mark_link == NULL) { + // Claim this nmethod for this thread to mark. + observed_mark_link = (nmethod*) + Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_link, NULL); + if (observed_mark_link == NULL) { + + // Atomically append this nmethod (now claimed) to the head of the list: + nmethod* observed_mark_nmethods = _oops_do_mark_nmethods; + for (;;) { + nmethod* required_mark_nmethods = observed_mark_nmethods; + _oops_do_mark_link = required_mark_nmethods; + observed_mark_nmethods = (nmethod*) + Atomic::cmpxchg_ptr(this, &_oops_do_mark_nmethods, required_mark_nmethods); + if (observed_mark_nmethods == required_mark_nmethods) + break; + } + // Mark was clear when we first saw this guy. + NOT_PRODUCT(if (TraceScavenge) print_on(tty, "oops_do, mark")); + return false; + } + } + // On fall through, another racing thread marked this nmethod before we did. + return true; +} + +void nmethod::oops_do_marking_prologue() { + NOT_PRODUCT(if (TraceScavenge) tty->print_cr("[oops_do_marking_prologue")); + assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row"); + // We use cmpxchg_ptr instead of regular assignment here because the user + // may fork a bunch of threads, and we need them all to see the same state. + void* observed = Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, NULL); + guarantee(observed == NULL, "no races in this sequential code"); +} + +void nmethod::oops_do_marking_epilogue() { + assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row"); + nmethod* cur = _oops_do_mark_nmethods; + while (cur != NMETHOD_SENTINEL) { + assert(cur != NULL, "not NULL-terminated"); + nmethod* next = cur->_oops_do_mark_link; + cur->_oops_do_mark_link = NULL; + cur->fix_oop_relocations(); + NOT_PRODUCT(if (TraceScavenge) cur->print_on(tty, "oops_do, unmark")); + cur = next; + } + void* required = _oops_do_mark_nmethods; + void* observed = Atomic::cmpxchg_ptr(NULL, &_oops_do_mark_nmethods, required); + guarantee(observed == required, "no races in this sequential code"); + NOT_PRODUCT(if (TraceScavenge) tty->print_cr("oops_do_marking_epilogue]")); +} + +class DetectScavengeRoot: public OopClosure { + bool _detected_scavenge_root; +public: + DetectScavengeRoot() : _detected_scavenge_root(false) + { NOT_PRODUCT(_print_nm = NULL); } + bool detected_scavenge_root() { return _detected_scavenge_root; } + virtual void do_oop(oop* p) { + if ((*p) != NULL && (*p)->is_scavengable()) { + NOT_PRODUCT(maybe_print(p)); + _detected_scavenge_root = true; + } + } + virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } + +#ifndef PRODUCT + nmethod* _print_nm; + void maybe_print(oop* p) { + if (_print_nm == NULL) return; + if (!_detected_scavenge_root) _print_nm->print_on(tty, "new scavenge root"); + tty->print_cr(""PTR_FORMAT"[offset=%d] detected scavengable oop "PTR_FORMAT" (found at "PTR_FORMAT")", + _print_nm, (int)((intptr_t)p - (intptr_t)_print_nm), + (intptr_t)(*p), (intptr_t)p); + (*p)->print(); + } +#endif //PRODUCT +}; + +bool nmethod::detect_scavenge_root_oops() { + DetectScavengeRoot detect_scavenge_root; + NOT_PRODUCT(if (TraceScavenge) detect_scavenge_root._print_nm = this); + oops_do(&detect_scavenge_root); + return detect_scavenge_root.detected_scavenge_root(); +} + +// Method that knows how to preserve outgoing arguments at call. This method must be +// called with a frame corresponding to a Java invoke +void nmethod::preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { +#ifndef SHARK + if (!method()->is_native()) { + SimpleScopeDesc ssd(this, fr.pc()); + Bytecode_invoke call(ssd.method(), ssd.bci()); + // compiled invokedynamic call sites have an implicit receiver at + // resolution time, so make sure it gets GC'ed. + bool has_receiver = !call.is_invokestatic(); + Symbol* signature = call.signature(); + fr.oops_compiled_arguments_do(signature, has_receiver, reg_map, f); + } +#endif // !SHARK +} + + +oop nmethod::embeddedOop_at(u_char* p) { + RelocIterator iter(this, p, p + 1); + while (iter.next()) + if (iter.type() == relocInfo::oop_type) { + return iter.oop_reloc()->oop_value(); + } + return NULL; +} + + +inline bool includes(void* p, void* from, void* to) { + return from <= p && p < to; +} + + +void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) { + assert(count >= 2, "must be sentinel values, at least"); + +#ifdef ASSERT + // must be sorted and unique; we do a binary search in find_pc_desc() + int prev_offset = pcs[0].pc_offset(); + assert(prev_offset == PcDesc::lower_offset_limit, + "must start with a sentinel"); + for (int i = 1; i < count; i++) { + int this_offset = pcs[i].pc_offset(); + assert(this_offset > prev_offset, "offsets must be sorted"); + prev_offset = this_offset; + } + assert(prev_offset == PcDesc::upper_offset_limit, + "must end with a sentinel"); +#endif //ASSERT + + // Search for MethodHandle invokes and tag the nmethod. + for (int i = 0; i < count; i++) { + if (pcs[i].is_method_handle_invoke()) { + set_has_method_handle_invokes(true); + break; + } + } + assert(has_method_handle_invokes() == (_deoptimize_mh_offset != -1), "must have deopt mh handler"); + + int size = count * sizeof(PcDesc); + assert(scopes_pcs_size() >= size, "oob"); + memcpy(scopes_pcs_begin(), pcs, size); + + // Adjust the final sentinel downward. + PcDesc* last_pc = &scopes_pcs_begin()[count-1]; + assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity"); + last_pc->set_pc_offset(content_size() + 1); + for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) { + // Fill any rounding gaps with copies of the last record. + last_pc[1] = last_pc[0]; + } + // The following assert could fail if sizeof(PcDesc) is not + // an integral multiple of oopSize (the rounding term). + // If it fails, change the logic to always allocate a multiple + // of sizeof(PcDesc), and fill unused words with copies of *last_pc. + assert(last_pc + 1 == scopes_pcs_end(), "must match exactly"); +} + +void nmethod::copy_scopes_data(u_char* buffer, int size) { + assert(scopes_data_size() >= size, "oob"); + memcpy(scopes_data_begin(), buffer, size); +} + + +#ifdef ASSERT +static PcDesc* linear_search(nmethod* nm, int pc_offset, bool approximate) { + PcDesc* lower = nm->scopes_pcs_begin(); + PcDesc* upper = nm->scopes_pcs_end(); + lower += 1; // exclude initial sentinel + PcDesc* res = NULL; + for (PcDesc* p = lower; p < upper; p++) { + NOT_PRODUCT(--nmethod_stats.pc_desc_tests); // don't count this call to match_desc + if (match_desc(p, pc_offset, approximate)) { + if (res == NULL) + res = p; + else + res = (PcDesc*) badAddress; + } + } + return res; +} +#endif + + +// Finds a PcDesc with real-pc equal to "pc" +PcDesc* nmethod::find_pc_desc_internal(address pc, bool approximate) { + address base_address = code_begin(); + if ((pc < base_address) || + (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) { + return NULL; // PC is wildly out of range + } + int pc_offset = (int) (pc - base_address); + + // Check the PcDesc cache if it contains the desired PcDesc + // (This as an almost 100% hit rate.) + PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate); + if (res != NULL) { + assert(res == linear_search(this, pc_offset, approximate), "cache ok"); + return res; + } + + // Fallback algorithm: quasi-linear search for the PcDesc + // Find the last pc_offset less than the given offset. + // The successor must be the required match, if there is a match at all. + // (Use a fixed radix to avoid expensive affine pointer arithmetic.) + PcDesc* lower = scopes_pcs_begin(); + PcDesc* upper = scopes_pcs_end(); + upper -= 1; // exclude final sentinel + if (lower >= upper) return NULL; // native method; no PcDescs at all + +#define assert_LU_OK \ + /* invariant on lower..upper during the following search: */ \ + assert(lower->pc_offset() < pc_offset, "sanity"); \ + assert(upper->pc_offset() >= pc_offset, "sanity") + assert_LU_OK; + + // Use the last successful return as a split point. + PcDesc* mid = _pc_desc_cache.last_pc_desc(); + NOT_PRODUCT(++nmethod_stats.pc_desc_searches); + if (mid->pc_offset() < pc_offset) { + lower = mid; + } else { + upper = mid; + } + + // Take giant steps at first (4096, then 256, then 16, then 1) + const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1); + const int RADIX = (1 << LOG2_RADIX); + for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) { + while ((mid = lower + step) < upper) { + assert_LU_OK; + NOT_PRODUCT(++nmethod_stats.pc_desc_searches); + if (mid->pc_offset() < pc_offset) { + lower = mid; + } else { + upper = mid; + break; + } + } + assert_LU_OK; + } + + // Sneak up on the value with a linear search of length ~16. + while (true) { + assert_LU_OK; + mid = lower + 1; + NOT_PRODUCT(++nmethod_stats.pc_desc_searches); + if (mid->pc_offset() < pc_offset) { + lower = mid; + } else { + upper = mid; + break; + } + } +#undef assert_LU_OK + + if (match_desc(upper, pc_offset, approximate)) { + assert(upper == linear_search(this, pc_offset, approximate), "search ok"); + _pc_desc_cache.add_pc_desc(upper); + return upper; + } else { + assert(NULL == linear_search(this, pc_offset, approximate), "search ok"); + return NULL; + } +} + + +bool nmethod::check_all_dependencies() { + bool found_check = false; + // wholesale check of all dependencies + for (Dependencies::DepStream deps(this); deps.next(); ) { + if (deps.check_dependency() != NULL) { + found_check = true; + NOT_DEBUG(break); + } + } + return found_check; // tell caller if we found anything +} + +bool nmethod::check_dependency_on(DepChange& changes) { + // What has happened: + // 1) a new class dependee has been added + // 2) dependee and all its super classes have been marked + bool found_check = false; // set true if we are upset + for (Dependencies::DepStream deps(this); deps.next(); ) { + // Evaluate only relevant dependencies. + if (deps.spot_check_dependency_at(changes) != NULL) { + found_check = true; + NOT_DEBUG(break); + } + } + return found_check; +} + +bool nmethod::is_evol_dependent_on(Klass* dependee) { + InstanceKlass *dependee_ik = InstanceKlass::cast(dependee); + Array<Method*>* dependee_methods = dependee_ik->methods(); + for (Dependencies::DepStream deps(this); deps.next(); ) { + if (deps.type() == Dependencies::evol_method) { + Method* method = deps.method_argument(0); + for (int j = 0; j < dependee_methods->length(); j++) { + if (dependee_methods->at(j) == method) { + // RC_TRACE macro has an embedded ResourceMark + RC_TRACE(0x01000000, + ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)", + _method->method_holder()->external_name(), + _method->name()->as_C_string(), + _method->signature()->as_C_string(), compile_id(), + method->method_holder()->external_name(), + method->name()->as_C_string(), + method->signature()->as_C_string())); + if (TraceDependencies || LogCompilation) + deps.log_dependency(dependee); + return true; + } + } + } + } + return false; +} + +// Called from mark_for_deoptimization, when dependee is invalidated. +bool nmethod::is_dependent_on_method(Method* dependee) { + for (Dependencies::DepStream deps(this); deps.next(); ) { + if (deps.type() != Dependencies::evol_method) + continue; + Method* method = deps.method_argument(0); + if (method == dependee) return true; + } + return false; +} + + +bool nmethod::is_patchable_at(address instr_addr) { + assert(insts_contains(instr_addr), "wrong nmethod used"); + if (is_zombie()) { + // a zombie may never be patched + return false; + } + return true; +} + + +address nmethod::continuation_for_implicit_exception(address pc) { + // Exception happened outside inline-cache check code => we are inside + // an active nmethod => use cpc to determine a return address + int exception_offset = pc - code_begin(); + int cont_offset = ImplicitExceptionTable(this).at( exception_offset ); +#ifdef ASSERT + if (cont_offset == 0) { + Thread* thread = ThreadLocalStorage::get_thread_slow(); + ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY + HandleMark hm(thread); + ResourceMark rm(thread); + CodeBlob* cb = CodeCache::find_blob(pc); + assert(cb != NULL && cb == this, ""); + tty->print_cr("implicit exception happened at " INTPTR_FORMAT, pc); + print(); + method()->print_codes(); + print_code(); + print_pcs(); + } +#endif + if (cont_offset == 0) { + // Let the normal error handling report the exception + return NULL; + } + return code_begin() + cont_offset; +} + + + +void nmethod_init() { + // make sure you didn't forget to adjust the filler fields + assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word"); +} + + +//------------------------------------------------------------------------------------------- + + +// QQQ might we make this work from a frame?? +nmethodLocker::nmethodLocker(address pc) { + CodeBlob* cb = CodeCache::find_blob(pc); + guarantee(cb != NULL && cb->is_nmethod(), "bad pc for a nmethod found"); + _nm = (nmethod*)cb; + lock_nmethod(_nm); +} + +// Only JvmtiDeferredEvent::compiled_method_unload_event() +// should pass zombie_ok == true. +void nmethodLocker::lock_nmethod(nmethod* nm, bool zombie_ok) { + if (nm == NULL) return; + Atomic::inc(&nm->_lock_count); + guarantee(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method"); +} + +void nmethodLocker::unlock_nmethod(nmethod* nm) { + if (nm == NULL) return; + Atomic::dec(&nm->_lock_count); + guarantee(nm->_lock_count >= 0, "unmatched nmethod lock/unlock"); +} + + +// ----------------------------------------------------------------------------- +// nmethod::get_deopt_original_pc +// +// Return the original PC for the given PC if: +// (a) the given PC belongs to a nmethod and +// (b) it is a deopt PC +address nmethod::get_deopt_original_pc(const frame* fr) { + if (fr->cb() == NULL) return NULL; + + nmethod* nm = fr->cb()->as_nmethod_or_null(); + if (nm != NULL && nm->is_deopt_pc(fr->pc())) + return nm->get_original_pc(fr); + + return NULL; +} + + +// ----------------------------------------------------------------------------- +// MethodHandle + +bool nmethod::is_method_handle_return(address return_pc) { + if (!has_method_handle_invokes()) return false; + PcDesc* pd = pc_desc_at(return_pc); + if (pd == NULL) + return false; + return pd->is_method_handle_invoke(); +} + + +// ----------------------------------------------------------------------------- +// Verification + +class VerifyOopsClosure: public OopClosure { + nmethod* _nm; + bool _ok; +public: + VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { } + bool ok() { return _ok; } + virtual void do_oop(oop* p) { + if ((*p) == NULL || (*p)->is_oop()) return; + if (_ok) { + _nm->print_nmethod(true); + _ok = false; + } + tty->print_cr("*** non-oop "PTR_FORMAT" found at "PTR_FORMAT" (offset %d)", + (intptr_t)(*p), (intptr_t)p, (int)((intptr_t)p - (intptr_t)_nm)); + } + virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } +}; + +void nmethod::verify() { + + // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant + // seems odd. + + if( is_zombie() || is_not_entrant() ) + return; + + // Make sure all the entry points are correctly aligned for patching. + NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point()); + + // assert(method()->is_oop(), "must be valid"); + + ResourceMark rm; + + if (!CodeCache::contains(this)) { + fatal(err_msg("nmethod at " INTPTR_FORMAT " not in zone", this)); + } + + if(is_native_method() ) + return; + + nmethod* nm = CodeCache::find_nmethod(verified_entry_point()); + if (nm != this) { + fatal(err_msg("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", + this)); + } + + for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { + if (! p->verify(this)) { + tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", this); + } + } + + VerifyOopsClosure voc(this); + oops_do(&voc); + assert(voc.ok(), "embedded oops must be OK"); + verify_scavenge_root_oops(); + + verify_scopes(); +} + + +void nmethod::verify_interrupt_point(address call_site) { + // This code does not work in release mode since + // owns_lock only is available in debug mode. + CompiledIC* ic = NULL; + Thread *cur = Thread::current(); + if (CompiledIC_lock->owner() == cur || + ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) && + SafepointSynchronize::is_at_safepoint())) { + ic = CompiledIC_at(this, call_site); + CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops()); + } else { + MutexLocker ml_verify (CompiledIC_lock); + ic = CompiledIC_at(this, call_site); + } + PcDesc* pd = pc_desc_at(ic->end_of_call()); + assert(pd != NULL, "PcDesc must exist"); + for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(), + pd->obj_decode_offset(), pd->should_reexecute(), pd->rethrow_exception(), + pd->return_oop()); + !sd->is_top(); sd = sd->sender()) { + sd->verify(); + } +} + +void nmethod::verify_scopes() { + if( !method() ) return; // Runtime stubs have no scope + if (method()->is_native()) return; // Ignore stub methods. + // iterate through all interrupt point + // and verify the debug information is valid. + RelocIterator iter((nmethod*)this); + while (iter.next()) { + address stub = NULL; + switch (iter.type()) { + case relocInfo::virtual_call_type: + verify_interrupt_point(iter.addr()); + break; + case relocInfo::opt_virtual_call_type: + stub = iter.opt_virtual_call_reloc()->static_stub(); + verify_interrupt_point(iter.addr()); + break; + case relocInfo::static_call_type: + stub = iter.static_call_reloc()->static_stub(); + //verify_interrupt_point(iter.addr()); + break; + case relocInfo::runtime_call_type: + address destination = iter.reloc()->value(); + // Right now there is no way to find out which entries support + // an interrupt point. It would be nice if we had this + // information in a table. + break; + } +#ifndef GRAAL + assert(stub == NULL || stub_contains(stub), "static call stub outside stub section"); +#endif + } +} + + +// ----------------------------------------------------------------------------- +// Non-product code +#ifndef PRODUCT + +class DebugScavengeRoot: public OopClosure { + nmethod* _nm; + bool _ok; +public: + DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { } + bool ok() { return _ok; } + virtual void do_oop(oop* p) { + if ((*p) == NULL || !(*p)->is_scavengable()) return; + if (_ok) { + _nm->print_nmethod(true); + _ok = false; + } + tty->print_cr("*** scavengable oop "PTR_FORMAT" found at "PTR_FORMAT" (offset %d)", + (intptr_t)(*p), (intptr_t)p, (int)((intptr_t)p - (intptr_t)_nm)); + (*p)->print(); + } + virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } +}; + +void nmethod::verify_scavenge_root_oops() { + if (!on_scavenge_root_list()) { + // Actually look inside, to verify the claim that it's clean. + DebugScavengeRoot debug_scavenge_root(this); + oops_do(&debug_scavenge_root); + if (!debug_scavenge_root.ok()) + fatal("found an unadvertised bad scavengable oop in the code cache"); + } + assert(scavenge_root_not_marked(), ""); +} + +#endif // PRODUCT + +// Printing operations + +void nmethod::print() const { + ResourceMark rm; + ttyLocker ttyl; // keep the following output all in one block + + tty->print("Compiled method "); + + if (is_compiled_by_c1()) { + tty->print("(c1) "); + } else if (is_compiled_by_c2()) { + tty->print("(c2) "); + } else if (is_compiled_by_shark()) { + tty->print("(shark) "); + } else { + tty->print("(nm) "); + } + + print_on(tty, NULL); + + if (WizardMode) { + tty->print("((nmethod*) "INTPTR_FORMAT ") ", this); + tty->print(" for method " INTPTR_FORMAT , (address)method()); + tty->print(" { "); + if (is_in_use()) tty->print("in_use "); + if (is_not_entrant()) tty->print("not_entrant "); + if (is_zombie()) tty->print("zombie "); + if (is_unloaded()) tty->print("unloaded "); + if (on_scavenge_root_list()) tty->print("scavenge_root "); + tty->print_cr("}:"); + } + if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", + (address)this, + (address)this + size(), + size()); + if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", + relocation_begin(), + relocation_end(), + relocation_size()); + if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", + consts_begin(), + consts_end(), + consts_size()); + if (insts_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", + insts_begin(), + insts_end(), + insts_size()); + if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", + stub_begin(), + stub_end(), + stub_size()); + if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", + oops_begin(), + oops_end(), + oops_size()); + if (metadata_size () > 0) tty->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", + metadata_begin(), + metadata_end(), + metadata_size()); + if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", + scopes_data_begin(), + scopes_data_end(), + scopes_data_size()); + if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", + scopes_pcs_begin(), + scopes_pcs_end(), + scopes_pcs_size()); + if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", + dependencies_begin(), + dependencies_end(), + dependencies_size()); + if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", + handler_table_begin(), + handler_table_end(), + handler_table_size()); + if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", + nul_chk_table_begin(), + nul_chk_table_end(), + nul_chk_table_size()); +} + +void nmethod::print_code() { + HandleMark hm; + ResourceMark m; + Disassembler::decode(this); +} + + +#ifndef PRODUCT + +void nmethod::print_scopes() { + // Find the first pc desc for all scopes in the code and print it. + ResourceMark rm; + for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { + if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null) + continue; + + ScopeDesc* sd = scope_desc_at(p->real_pc(this)); + sd->print_on(tty, p); + } +} + +void nmethod::print_dependencies() { + ResourceMark rm; + ttyLocker ttyl; // keep the following output all in one block + tty->print_cr("Dependencies:"); + for (Dependencies::DepStream deps(this); deps.next(); ) { + deps.print_dependency(); + Klass* ctxk = deps.context_type(); + if (ctxk != NULL) { + if (ctxk->oop_is_instance() && ((InstanceKlass*)ctxk)->is_dependent_nmethod(this)) { + tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name()); + } + } + deps.log_dependency(); // put it into the xml log also + } +} + + +void nmethod::print_relocations() { + ResourceMark m; // in case methods get printed via the debugger + tty->print_cr("relocations:"); + RelocIterator iter(this); + iter.print(); + if (UseRelocIndex) { + jint* index_end = (jint*)relocation_end() - 1; + jint index_size = *index_end; + jint* index_start = (jint*)( (address)index_end - index_size ); + tty->print_cr(" index @" INTPTR_FORMAT ": index_size=%d", index_start, index_size); + if (index_size > 0) { + jint* ip; + for (ip = index_start; ip+2 <= index_end; ip += 2) + tty->print_cr(" (%d %d) addr=" INTPTR_FORMAT " @" INTPTR_FORMAT, + ip[0], + ip[1], + header_end()+ip[0], + relocation_begin()-1+ip[1]); + for (; ip < index_end; ip++) + tty->print_cr(" (%d ?)", ip[0]); + tty->print_cr(" @" INTPTR_FORMAT ": index_size=%d", ip, *ip++); + tty->print_cr("reloc_end @" INTPTR_FORMAT ":", ip); + } + } +} + + +void nmethod::print_pcs() { + ResourceMark m; // in case methods get printed via debugger + tty->print_cr("pc-bytecode offsets:"); + for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { + p->print(this); + } +} + +#endif // PRODUCT + +const char* nmethod::reloc_string_for(u_char* begin, u_char* end) { + RelocIterator iter(this, begin, end); + bool have_one = false; + while (iter.next()) { + have_one = true; + switch (iter.type()) { + case relocInfo::none: return "no_reloc"; + case relocInfo::oop_type: { + stringStream st; + oop_Relocation* r = iter.oop_reloc(); + oop obj = r->oop_value(); + st.print("oop("); + if (obj == NULL) st.print("NULL"); + else obj->print_value_on(&st); + st.print(")"); + return st.as_string(); + } + case relocInfo::metadata_type: { + stringStream st; + metadata_Relocation* r = iter.metadata_reloc(); + Metadata* obj = r->metadata_value(); + st.print("metadata("); + if (obj == NULL) st.print("NULL"); + else obj->print_value_on(&st); + st.print(")"); + return st.as_string(); + } + case relocInfo::virtual_call_type: return "virtual_call"; + case relocInfo::opt_virtual_call_type: return "optimized virtual_call"; + case relocInfo::static_call_type: return "static_call"; + case relocInfo::static_stub_type: return "static_stub"; + case relocInfo::runtime_call_type: return "runtime_call"; + case relocInfo::external_word_type: return "external_word"; + case relocInfo::internal_word_type: return "internal_word"; + case relocInfo::section_word_type: return "section_word"; + case relocInfo::poll_type: return "poll"; + case relocInfo::poll_return_type: return "poll_return"; + case relocInfo::type_mask: return "type_bit_mask"; + } + } + return have_one ? "other" : NULL; +} + +// Return a the last scope in (begin..end] +ScopeDesc* nmethod::scope_desc_in(address begin, address end) { + PcDesc* p = pc_desc_near(begin+1); + if (p != NULL && p->real_pc(this) <= end) { + return new ScopeDesc(this, p->scope_decode_offset(), + p->obj_decode_offset(), p->should_reexecute(), p->rethrow_exception(), + p->return_oop()); + } + return NULL; +} + +void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) const { + if (block_begin == entry_point()) stream->print_cr("[Entry Point]"); + if (block_begin == verified_entry_point()) stream->print_cr("[Verified Entry Point]"); + if (GRAAL_ONLY(_exception_offset >= 0 &&) block_begin == exception_begin()) stream->print_cr("[Exception Handler]"); + if (block_begin == stub_begin()) stream->print_cr("[Stub Code]"); + if (GRAAL_ONLY(_deoptimize_offset >= 0 &&) block_begin == deopt_handler_begin()) stream->print_cr("[Deopt Handler Code]"); + + if (has_method_handle_invokes()) + if (block_begin == deopt_mh_handler_begin()) stream->print_cr("[Deopt MH Handler Code]"); + + if (block_begin == consts_begin()) stream->print_cr("[Constants]"); + + if (block_begin == entry_point()) { + methodHandle m = method(); + if (m.not_null()) { + stream->print(" # "); + m->print_value_on(stream); + stream->cr(); + } + if (m.not_null() && !is_osr_method()) { + ResourceMark rm; + int sizeargs = m->size_of_parameters(); + BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs); + VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs); + { + int sig_index = 0; + if (!m->is_static()) + sig_bt[sig_index++] = T_OBJECT; // 'this' + for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) { + BasicType t = ss.type(); + sig_bt[sig_index++] = t; + if (type2size[t] == 2) { + sig_bt[sig_index++] = T_VOID; + } else { + assert(type2size[t] == 1, "size is 1 or 2"); + } + } + assert(sig_index == sizeargs, ""); + } + const char* spname = "sp"; // make arch-specific? + intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false); + int stack_slot_offset = this->frame_size() * wordSize; + int tab1 = 14, tab2 = 24; + int sig_index = 0; + int arg_index = (m->is_static() ? 0 : -1); + bool did_old_sp = false; + for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) { + bool at_this = (arg_index == -1); + bool at_old_sp = false; + BasicType t = (at_this ? T_OBJECT : ss.type()); + assert(t == sig_bt[sig_index], "sigs in sync"); + if (at_this) + stream->print(" # this: "); + else + stream->print(" # parm%d: ", arg_index); + stream->move_to(tab1); + VMReg fst = regs[sig_index].first(); + VMReg snd = regs[sig_index].second(); + if (fst->is_reg()) { + stream->print("%s", fst->name()); + if (snd->is_valid()) { + stream->print(":%s", snd->name()); + } + } else if (fst->is_stack()) { + int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset; + if (offset == stack_slot_offset) at_old_sp = true; + stream->print("[%s+0x%x]", spname, offset); + } else { + stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd); + } + stream->print(" "); + stream->move_to(tab2); + stream->print("= "); + if (at_this) { + m->method_holder()->print_value_on(stream); + } else { + bool did_name = false; + if (!at_this && ss.is_object()) { + Symbol* name = ss.as_symbol_or_null(); + if (name != NULL) { + name->print_value_on(stream); + did_name = true; + } + } + if (!did_name) + stream->print("%s", type2name(t)); + } + if (at_old_sp) { + stream->print(" (%s of caller)", spname); + did_old_sp = true; + } + stream->cr(); + sig_index += type2size[t]; + arg_index += 1; + if (!at_this) ss.next(); + } + if (!did_old_sp) { + stream->print(" # "); + stream->move_to(tab1); + stream->print("[%s+0x%x]", spname, stack_slot_offset); + stream->print(" (%s of caller)", spname); + stream->cr(); + } + } + } +} + +void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) { + // First, find an oopmap in (begin, end]. + // We use the odd half-closed interval so that oop maps and scope descs + // which are tied to the byte after a call are printed with the call itself. + address base = code_begin(); + OopMapSet* oms = oop_maps(); + if (oms != NULL) { + for (int i = 0, imax = oms->size(); i < imax; i++) { + OopMap* om = oms->at(i); + address pc = base + om->offset(); + if (pc > begin) { + if (pc <= end) { + st->move_to(column); + st->print("; "); + om->print_on(st); + } + break; + } + } + } + + // Print any debug info present at this pc. + ScopeDesc* sd = scope_desc_in(begin, end); + if (sd != NULL) { + st->move_to(column); + if (sd->bci() == SynchronizationEntryBCI) { + st->print(";*synchronization entry"); + } else { + if (sd->method() == NULL) { + st->print("method is NULL"); + } else if (sd->method()->is_native()) { + st->print("method is native"); + } else { + Bytecodes::Code bc = sd->method()->java_code_at(sd->bci()); + st->print(";*%s", Bytecodes::name(bc)); + switch (bc) { + case Bytecodes::_invokevirtual: + case Bytecodes::_invokespecial: + case Bytecodes::_invokestatic: + case Bytecodes::_invokeinterface: + { + Bytecode_invoke invoke(sd->method(), sd->bci()); + st->print(" "); + if (invoke.name() != NULL) + invoke.name()->print_symbol_on(st); + else + st->print("<UNKNOWN>"); + break; + } + case Bytecodes::_getfield: + case Bytecodes::_putfield: + case Bytecodes::_getstatic: + case Bytecodes::_putstatic: + { + Bytecode_field field(sd->method(), sd->bci()); + st->print(" "); + if (field.name() != NULL) + field.name()->print_symbol_on(st); + else + st->print("<UNKNOWN>"); + } + } + } + } + + // Print all scopes + for (;sd != NULL; sd = sd->sender()) { + st->move_to(column); + st->print("; -"); + if (sd->method() == NULL) { + st->print("method is NULL"); + } else { + sd->method()->print_short_name(st); + } + int lineno = sd->method()->line_number_from_bci(sd->bci()); + if (lineno != -1) { + st->print("@%d (line %d)", sd->bci(), lineno); + } else { + st->print("@%d", sd->bci()); + } + st->cr(); + } + } + + // Print relocation information + const char* str = reloc_string_for(begin, end); + if (str != NULL) { + if (sd != NULL) st->cr(); + st->move_to(column); + st->print("; {%s}", str); + } + int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin()); + if (cont_offset != 0) { + st->move_to(column); + st->print("; implicit exception: dispatches to " INTPTR_FORMAT, code_begin() + cont_offset); + } + +} + +#ifndef PRODUCT + +void nmethod::print_value_on(outputStream* st) const { + st->print("nmethod"); + print_on(st, NULL); +} + +void nmethod::print_calls(outputStream* st) { + RelocIterator iter(this); + while (iter.next()) { + switch (iter.type()) { + case relocInfo::virtual_call_type: + case relocInfo::opt_virtual_call_type: { + VerifyMutexLocker mc(CompiledIC_lock); + CompiledIC_at(iter.reloc())->print(); + break; + } + case relocInfo::static_call_type: + st->print_cr("Static call at " INTPTR_FORMAT, iter.reloc()->addr()); + compiledStaticCall_at(iter.reloc())->print(); + break; + } + } +} + +void nmethod::print_handler_table() { + ExceptionHandlerTable(this).print(); +} + +void nmethod::print_nul_chk_table() { + ImplicitExceptionTable(this).print(code_begin()); +} + +#endif // PRODUCT + +void nmethod::print_statistics() { + ttyLocker ttyl; + if (xtty != NULL) xtty->head("statistics type='nmethod'"); + nmethod_stats.print_native_nmethod_stats(); + nmethod_stats.print_nmethod_stats(); + DebugInformationRecorder::print_statistics(); + nmethod_stats.print_pc_stats(); + Dependencies::print_statistics(); + if (xtty != NULL) xtty->tail("statistics"); +} + +#ifdef GRAAL +void DebugScopedNMethod::print_on(outputStream* st) { + if (_nm != NULL) { + st->print("nmethod@%p", _nm); + Method* method = _nm->method(); + if (method != NULL) { + char holder[O_BUFLEN]; + char nameAndSig[O_BUFLEN]; + method->method_holder()->name()->as_C_string(holder, O_BUFLEN); + method->name_and_sig_as_C_string(nameAndSig, O_BUFLEN); + st->print(" - %s::%s", holder, nameAndSig); + } + } +} +#endif