truffle: src/share/vm/code/nmethod.cpp comparison

comparison src/share/vm/code/nmethod.cpp @ 0:a61af66fc99e jdk7-b24

Initial load

author	duke
date	Sat, 01 Dec 2007 00:00:00 +0000
parents
children	65a06b4a51b8

comparison

equal deleted inserted replaced

--1:000000000000
+:a61af66fc99e
+/*
+* Copyright 1997-2007 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+* CA 95054 USA or visit www.sun.com if you need additional information or
+* have any questions.
+*
+*/
+# include "incls/_precompiled.incl"
+# include "incls/_nmethod.cpp.incl"
+#ifdef DTRACE_ENABLED
+// Only bother with this argument setup if dtrace is available
+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) {                                                      \
+symbolOop klass_name = m->klass_name();                             \
+symbolOop name = m->name();                                         \
+symbolOop 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 //  ndef DTRACE_ENABLED
+#define DTRACE_METHOD_UNLOAD_PROBE(method)
+#endif
+bool nmethod::is_compiled_by_c1() const {
+if (is_native_method()) return false;
+assert(compiler() != NULL, "must be");
+return compiler()->is_c1();
+}
+bool nmethod::is_compiled_by_c2() const {
+if (is_native_method()) return false;
+assert(compiler() != NULL, "must be");
+return compiler()->is_c2();
+}
+//---------------------------------------------------------------------------------
+// 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.)
+#ifndef PRODUCT
+// 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 code_size;
+int stub_size;
+int consts_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();
+code_size           += nm->code_size();
+stub_size           += nm->stub_size();
+consts_size         += nm->consts_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();
+oops_size += nm->oops_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 (code_size != 0)           tty->print_cr(" main code      = %d", code_size);
+if (stub_size != 0)           tty->print_cr(" stub code      = %d", stub_size);
+if (consts_size != 0)         tty->print_cr(" constants      = %d", consts_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);
+if (oops_size != 0)           tty->print_cr(" oops           = %d", oops_size);
+}
+int native_nmethod_count;
+int native_total_size;
+int native_relocation_size;
+int native_code_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_code_size        += nm->code_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_code_size != 0)        tty->print_cr(" N. main code   = %d", native_code_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 _last_pc_desc 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;
+#endif //PRODUCT
+//---------------------------------------------------------------------------------
+// The _unwind_handler is a special marker address, which says that
+// for given exception oop and address, the frame should be removed
+// as the tuple cannot be caught in the nmethod
+address ExceptionCache::_unwind_handler = (address) -1;
+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) {
+_last_pc_desc = NULL;  // native method
+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");
+_last_pc_desc = initial_pc_desc + 1;  // first valid one is after 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);
+// 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 returned value.
+res = _last_pc_desc;
+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 LRU cache.
+for (int i = 0; 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);
+_last_pc_desc = res;  // record this cache hit in case of repeat
+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;
+}
+// Note:  Do not update _last_pc_desc.  It fronts for the LRU cache.
+}
+// 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 dont 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--------------
+void nmFlags::clear() {
+assert(sizeof(nmFlags) == sizeof(int), "using more than one word for nmFlags");
+*(jint*)this = 0;
+}
+int nmethod::total_size() const {
+return
+code_size()          +
+stub_size()          +
+consts_size()        +
+scopes_data_size()   +
+scopes_pcs_size()    +
+handler_table_size() +
+nul_chk_table_size();
+}
+const char* nmethod::compile_kind() const {
+if (method() == NULL)    return "unloaded";
+if (is_native_method())  return "c2n";
+if (is_osr_method())     return "osr";
+return NULL;
+}
+// %%% This variable is no longer used?
+int nmethod::_zombie_instruction_size = NativeJump::instruction_size;
+nmethod* nmethod::new_native_nmethod(methodHandle method,
+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));
+const int dummy = -1;               // Flag to force proper "operator new"
+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, &offsets,
+code_buffer, frame_size,
+basic_lock_owner_sp_offset, basic_lock_sp_offset,
+oop_maps);
+NOT_PRODUCT(if (nm != NULL)  nmethod_stats.note_native_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;
+}
+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);
+}
+}
+NOT_PRODUCT(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();
+}
+// done
+return nm;
+}
+// For native wrappers
+nmethod::nmethod(
+methodOop method,
+int nmethod_size,
+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),
+_compiled_synchronized_native_basic_lock_owner_sp_offset(basic_lock_owner_sp_offset),
+_compiled_synchronized_native_basic_lock_sp_offset(basic_lock_sp_offset)
+{
+{
+debug_only(No_Safepoint_Verifier nsv;)
+assert_locked_or_safepoint(CodeCache_lock);
+NOT_PRODUCT(_has_debug_info = false; )
+_method                  = method;
+_entry_bci               = InvocationEntryBci;
+_link                    = NULL;
+_compiler                = NULL;
+// 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;
+_orig_pc_offset          = 0;
+_stub_offset             = data_offset();
+_consts_offset           = data_offset();
+_scopes_data_offset      = data_offset();
+_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             = instructions_begin();
+_verified_entry_point    = instructions_begin() + offsets->value(CodeOffsets::Verified_Entry);
+_osr_entry_point         = NULL;
+_exception_cache         = NULL;
+_pc_desc_cache.reset_to(NULL);
+flags.clear();
+flags.state              = alive;
+_markedForDeoptimization = 0;
+_lock_count = 0;
+_stack_traversal_mark    = 0;
+code_buffer->copy_oops_to(this);
+debug_only(check_store();)
+CodeCache::commit(this);
+VTune::create_nmethod(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");
+}
+}
+Events::log("Create nmethod " INTPTR_FORMAT, this);
+}
+void* nmethod::operator new(size_t size, int nmethod_size) {
+// Always leave some room in the CodeCache for I2C/C2I adapters
+if (CodeCache::unallocated_capacity() < 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),
+_compiled_synchronized_native_basic_lock_owner_sp_offset(in_ByteSize(-1)),
+_compiled_synchronized_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);
+NOT_PRODUCT(_has_debug_info = false; )
+_method                  = method;
+_compile_id              = compile_id;
+_comp_level              = comp_level;
+_entry_bci               = entry_bci;
+_link                    = NULL;
+_compiler                = compiler;
+_orig_pc_offset          = orig_pc_offset;
+_stub_offset             = instructions_offset() + code_buffer->total_offset_of(code_buffer->stubs()->start());
+// Exception handler and deopt handler are in the stub section
+_exception_offset        = _stub_offset + offsets->value(CodeOffsets::Exceptions);
+_deoptimize_offset       = _stub_offset + offsets->value(CodeOffsets::Deopt);
+_consts_offset           = instructions_offset() + code_buffer->total_offset_of(code_buffer->consts()->start());
+_scopes_data_offset      = data_offset();
+_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             = instructions_begin();
+_verified_entry_point    = instructions_begin() + offsets->value(CodeOffsets::Verified_Entry);
+_osr_entry_point         = instructions_begin() + offsets->value(CodeOffsets::OSR_Entry);
+_exception_cache         = NULL;
+_pc_desc_cache.reset_to(scopes_pcs_begin());
+flags.clear();
+flags.state              = alive;
+_markedForDeoptimization = 0;
+_unload_reported         = false;           // jvmti state
+_lock_count = 0;
+_stack_traversal_mark    = 0;
+// Copy contents of ScopeDescRecorder to nmethod
+code_buffer->copy_oops_to(this);
+debug_info->copy_to(this);
+dependencies->copy_to(this);
+debug_only(check_store();)
+CodeCache::commit(this);
+VTune::create_nmethod(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::has_option_string(_method, "PrintNMethods");
+if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) {
+print_nmethod(printnmethods);
+}
+// Note: Do not verify in here as the CodeCache_lock is
+//       taken which would conflict with the CompiledIC_lock
+//       which taken during the verification of call sites.
+//       (was bug - gri 10/25/99)
+Events::log("Create nmethod " INTPTR_FORMAT, this);
+}
+// 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());
+}
+#ifdef TIERED
+log->print(" level='%d'", comp_level());
+#endif // TIERED
+}
+#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'",
+instructions_begin(), size());
+xtty->print(" address='" INTPTR_FORMAT "'", (intptr_t) this);
+LOG_OFFSET(xtty, relocation);
+LOG_OFFSET(xtty, code);
+LOG_OFFSET(xtty, stub);
+LOG_OFFSET(xtty, consts);
+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* title) const {
+if (st != NULL) {
+ttyLocker ttyl;
+// Print a little tag line that looks like +PrintCompilation output:
+st->print("%3d%c  %s",
+compile_id(),
+is_osr_method() ? '%' :
+method() != NULL &&
+is_native_method() ? 'n' : ' ',
+title);
+#ifdef TIERED
+st->print(" (%d) ", comp_level());
+#endif // TIERED
+if (WizardMode) st->print(" (" INTPTR_FORMAT ")", this);
+if (method() != NULL) {
+method()->print_short_name(st);
+if (is_osr_method())
+st->print(" @ %d", osr_entry_bci());
+if (method()->code_size() > 0)
+st->print(" (%d bytes)", method()->code_size());
+}
+}
+}
+#ifndef PRODUCT
+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();
+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");
+}
+}
+#endif
+void nmethod::set_version(int v) {
+flags.version = v;
+}
+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());
+}
+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(SafepointSynchronize::is_at_safepoint() &&
+!CompiledIC_lock->is_locked() &&
+!Patching_lock->is_locked(), "no threads must be updating the inline caches by them selfs");
+// 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()) 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()) csc->set_to_clean();
+}
+break;
+}
+}
+}
+}
+void nmethod::mark_as_seen_on_stack() {
+assert(is_not_entrant(), "must be a non-entrant method");
+set_stack_traversal_mark(NMethodSweeper::traversal_count());
+}
+// Tell if a non-entrant method can be converted to a zombie (i.e., there is no activations on the stack)
+bool nmethod::can_not_entrant_be_converted() {
+assert(is_not_entrant(), "must be a non-entrant method");
+assert(SafepointSynchronize::is_at_safepoint(), "must be called during a safepoint");
+// 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();
+}
+void nmethod::inc_decompile_count() {
+// 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);
+cause->klass()->print();
+}
+// 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
+}
+inc_decompile_count();     // Last chance to make a mark on the MDO
+_method = NULL;            // Clear the method of this dead nmethod
+}
+// Make the class unloaded - i.e., change state and notify sweeper
+check_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);
+}
+flags.state = unloaded;
+// The methodOop is gone at this point
+assert(_method == NULL, "Tautology");
+set_link(NULL);
+NMethodSweeper::notify(this);
+}
+void nmethod::invalidate_osr_method() {
+assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod");
+if (_entry_bci != InvalidOSREntryBci)
+inc_decompile_count();
+// 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(int state) const {
+if (LogCompilation) {
+if (xtty != NULL) {
+ttyLocker ttyl;  // keep the following output all in one block
+xtty->begin_elem("make_not_entrant %sthread='" UINTX_FORMAT "'",
+(state == zombie ? "zombie='1' " : ""),
+os::current_thread_id());
+log_identity(xtty);
+xtty->stamp();
+xtty->end_elem();
+}
+}
+if (PrintCompilation) {
+print_on(tty, state == zombie ? "made zombie " : "made not entrant ");
+tty->cr();
+}
+}
+// Common functionality for both make_not_entrant and make_zombie
+void nmethod::make_not_entrant_or_zombie(int state) {
+assert(state == zombie || state == not_entrant, "must be zombie or not_entrant");
+// Code for an on-stack-replacement nmethod is removed when a class gets unloaded.
+// They never become zombie/non-entrant, so the nmethod sweeper will never remove
+// them. Instead the entry_bci is set to InvalidOSREntryBci, so the osr nmethod
+// will never be used anymore. That the nmethods only gets removed when class unloading
+// happens, make life much simpler, since the nmethods are not just going to disappear
+// out of the blue.
+if (is_osr_only_method()) {
+if (osr_entry_bci() != InvalidOSREntryBci) {
+// only log this once
+log_state_change(state);
+}
+invalidate_osr_method();
+return;
+}
+// If the method is already zombie or set to the state we want, nothing to do
+if (is_zombie() || (state == not_entrant && is_not_entrant())) {
+return;
+}
+log_state_change(state);
+// Make sure the nmethod is not flushed in case of a safepoint in code below.
+nmethodLocker nml(this);
+{
+// Enter critical section.  Does not block for safepoint.
+MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
+// The caller can be calling the method statically or through an inline
+// cache call.
+if (!is_not_entrant()) {
+NativeJump::patch_verified_entry(entry_point(), verified_entry_point(),
+SharedRuntime::get_handle_wrong_method_stub());
+assert (NativeJump::instruction_size == nmethod::_zombie_instruction_size, "");
+}
+// 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) {
+assert(SafepointSynchronize::is_at_safepoint(), "must be done at safepoint");
+flush_dependencies(NULL);
+} else {
+assert(state == not_entrant, "other cases may need to be handled differently");
+}
+// Change state
+flags.state = state;
+} // leave critical region under Patching_lock
+if (state == not_entrant) {
+Events::log("Make nmethod not entrant " INTPTR_FORMAT, this);
+} else {
+Events::log("Make nmethod zombie " INTPTR_FORMAT, this);
+}
+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);
+// not_entrant only stuff
+if (state == not_entrant) {
+mark_as_seen_on_stack();
+}
+// It's a true state change, so mark the method as decompiled.
+inc_decompile_count();
+// 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).
+if (state == zombie) {
+DTRACE_METHOD_UNLOAD_PROBE(method());
+if (JvmtiExport::should_post_compiled_method_unload() &&
+!unload_reported()) {
+assert(method() != NULL, "checking");
+{
+HandleMark hm;
+JvmtiExport::post_compiled_method_unload_at_safepoint(
+method()->jmethod_id(), code_begin());
+}
+set_unload_reported();
+}
+}
+// Zombie only stuff
+if (state == zombie) {
+VTune::delete_nmethod(this);
+}
+// Check whether method got unloaded at a safepoint before this,
+// if so we can skip the flushing steps below
+if (method() == NULL) return;
+// 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()->code() == this ||
+method()->from_compiled_entry() == verified_entry_point()) {
+HandleMark hm;
+method()->clear_code();
+}
+}
+#ifndef PRODUCT
+void nmethod::check_safepoint() {
+assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
+}
+#endif
+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");
+check_safepoint();
+// completely deallocate this method
+EventMark m("flushing nmethod " INTPTR_FORMAT " %s", this, "");
+if (PrintMethodFlushing) {
+tty->print_cr("*flushing nmethod " INTPTR_FORMAT ". Live blobs: %d", this, CodeCache::nof_blobs());
+}
+// 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;
+}
+((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(SafepointSynchronize::is_at_safepoint(), "must be done at safepoint");
+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 (!UseParallelOldGC || !VerifyParallelOldWithMarkSweep) {
+// Cannot do this test if verification of the UseParallelOldGC
+// code using the PSMarkSweep code is being done.
+assert(unloading_occurred, "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();
+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(),
+code_begin(), code_size());
+if (JvmtiExport::should_post_compiled_method_load()) {
+JvmtiExport::post_compiled_method_load(this);
+}
+}
+void nmethod::post_compiled_method_unload() {
+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 (JvmtiExport::should_post_compiled_method_unload()) {
+assert(!unload_reported(), "already unloaded");
+HandleMark hm;
+JvmtiExport::post_compiled_method_unload_at_safepoint(
+method()->jmethod_id(), code_begin());
+}
+// 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;
+}
+// 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
+}
+void nmethod::oops_do(OopClosure* f) {
+// 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);
+ExceptionCache* ec = exception_cache();
+while(ec != NULL) {
+f->do_oop((oop*)ec->exception_type_addr());
+ec = ec->next();
+}
+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
+for (oop* p = oops_begin(); p < oops_end(); p++) {
+if (*p == Universe::non_oop_word())  continue;  // skip non-oops
+f->do_oop(p);
+}
+}
+// 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) {
+if (!method()->is_native()) {
+SimpleScopeDesc ssd(this, fr.pc());
+Bytecode_invoke* call = Bytecode_invoke_at(ssd.method(), ssd.bci());
+bool is_static = call->is_invokestatic();
+symbolOop signature = call->signature();
+fr.oops_compiled_arguments_do(signature, is_static, reg_map, f);
+}
+}
+oop nmethod::embeddedOop_at(u_char* p) {
+RelocIterator iter(this, p, p + oopSize);
+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
+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(instructions_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 = instructions_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 (code_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 - instructions_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
+guarantee(cont_offset != 0, "unhandled implicit exception in compiled code");
+return instructions_begin() + cont_offset;
+}
+void nmethod_init() {
+// make sure you didn't forget to adjust the filler fields
+assert(sizeof(nmFlags) <= 4,           "nmFlags occupies more than a word");
+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);
+}
+void nmethodLocker::lock_nmethod(nmethod* nm) {
+if (nm == NULL)  return;
+Atomic::inc(&nm->_lock_count);
+guarantee(!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");
+}
+bool nmethod::is_deopt_pc(address pc) {
+bool ret =  pc == deopt_handler_begin();
+return ret;
+}
+// -----------------------------------------------------------------------------
+// Verification
+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)) {
+fatal1("nmethod at " INTPTR_FORMAT " not in zone", this);
+}
+if(is_native_method() )
+return;
+nmethod* nm = CodeCache::find_nmethod(verified_entry_point());
+if (nm != this) {
+fatal1("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);
+}
+}
+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());
+!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;
+}
+assert(stub == NULL || stub_contains(stub), "static call stub outside stub section");
+}
+}
+// -----------------------------------------------------------------------------
+// Non-product code
+#ifndef PRODUCT
+void nmethod::check_store() {
+// Make sure all oops in the compiled code are tenured
+RelocIterator iter(this);
+while (iter.next()) {
+if (iter.type() == relocInfo::oop_type) {
+oop_Relocation* reloc = iter.oop_reloc();
+oop obj = reloc->oop_value();
+if (obj != NULL && !obj->is_perm()) {
+fatal("must be permanent oop in compiled code");
+}
+}
+}
+}
+// Printing operations
+void nmethod::print() const {
+ResourceMark rm;
+ttyLocker ttyl;   // keep the following output all in one block
+tty->print("Compiled ");
+if (is_compiled_by_c1()) {
+tty->print("(c1) ");
+} else if (is_compiled_by_c2()) {
+tty->print("(c2) ");
+} else {
+assert(is_native_method(), "Who else?");
+tty->print("(nm) ");
+}
+print_on(tty, "nmethod");
+tty->cr();
+if (WizardMode) {
+tty->print("((nmethod*) "INTPTR_FORMAT ") ", this);
+tty->print(" for method " INTPTR_FORMAT , (address)method());
+tty->print(" { ");
+if (version())        tty->print("v%d ", version());
+if (level())          tty->print("l%d ", level());
+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 ");
+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 (code_size         () > 0) tty->print_cr(" main code      [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
+code_begin(),
+code_end(),
+code_size());
+if (stub_size         () > 0) tty->print_cr(" stub code      [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
+stub_begin(),
+stub_end(),
+stub_size());
+if (consts_size       () > 0) tty->print_cr(" constants      [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
+consts_begin(),
+consts_end(),
+consts_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());
+if (oops_size         () > 0) tty->print_cr(" oops           [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d",
+oops_begin(),
+oops_end(),
+oops_size());
+}
+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("   [nmethod<=klass]%s", k->external_name());
+}
+}
+deps.log_dependency();  // put it into the xml log also
+}
+}
+void nmethod::print_code() {
+HandleMark hm;
+ResourceMark m;
+Disassembler().decode(this);
+}
+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);
+}
+}
+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());
+}
+return NULL;
+}
+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 = instructions_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->fill_to(column);
+if (st == tty) {
+st->print("; OopMap ");
+om->print();
+tty->cr();
+} else {
+st->print_cr("; OopMap #%d offset:%d", i, om->offset());
+}
+}
+break;
+}
+}
+}
+ScopeDesc* sd  = scope_desc_in(begin, end);
+if (sd != NULL) {
+st->fill_to(column);
+if (sd->bci() == SynchronizationEntryBCI) {
+st->print(";*synchronization entry");
+} else {
+if (sd->method().is_null()) {
+tty->print("method is NULL");
+} else if (sd->method()->is_native()) {
+tty->print("method is native");
+} else {
+address bcp  = sd->method()->bcp_from(sd->bci());
+Bytecodes::Code bc = Bytecodes::java_code_at(bcp);
+st->print(";*%s", Bytecodes::name(bc));
+switch (bc) {
+case Bytecodes::_invokevirtual:
+case Bytecodes::_invokespecial:
+case Bytecodes::_invokestatic:
+case Bytecodes::_invokeinterface:
+{
+Bytecode_invoke* invoke = Bytecode_invoke_at(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:
+{
+methodHandle sdm = sd->method();
+Bytecode_field* field = Bytecode_field_at(sdm(), sdm->bcp_from(sd->bci()));
+constantPoolOop sdmc = sdm->constants();
+symbolOop name = sdmc->name_ref_at(field->index());
+st->print(" ");
+if (name != NULL)
+name->print_symbol_on(st);
+else
+st->print("<UNKNOWN>");
+}
+}
+}
+}
+st->cr();
+// Print all scopes
+for (;sd != NULL; sd = sd->sender()) {
+st->fill_to(column);
+st->print("; -");
+if (sd->method().is_null()) {
+tty->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->fill_to(column);
+st->print(";   {%s}", str);
+}
+int cont_offset = ImplicitExceptionTable(this).at(begin - instructions_begin());
+if (cont_offset != 0) {
+st->fill_to(column);
+st->print("; implicit exception: dispatches to " INTPTR_FORMAT, instructions_begin() + cont_offset);
+}
+}
+void nmethod::print_value_on(outputStream* st) const {
+print_on(st, "nmethod");
+}
+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(instructions_begin());
+}
+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");
+}
+#endif // PRODUCT

Mercurial > hg > truffle

comparison src/share/vm/code/nmethod.cpp @ 0:a61af66fc99e jdk7-b24