Mercurial > hg > truffle
view src/cpu/x86/vm/templateInterpreter_x86_32.cpp @ 10185:d50cc62e94ff
8012715: G1: GraphKit accesses PtrQueue::_index as int but is size_t
Summary: In graphKit INT operations were generated to access PtrQueue::_index which has type size_t. This is 64 bit on 64-bit machines. No problems occur on little endian machines as long as the index fits into 32 bit, but on big endian machines the upper part is read, which is zero. This leads to unnecessary branches to the slow path in the runtime.
Reviewed-by: twisti, johnc
Contributed-by: Martin Doerr <martin.doerr@sap.com>
author | johnc |
---|---|
date | Wed, 24 Apr 2013 14:48:43 -0700 |
parents | aeaca88565e6 |
children | 47766e2d2527 |
line wrap: on
line source
/* * Copyright (c) 1997, 2013, 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 "asm/macroAssembler.hpp" #include "interpreter/bytecodeHistogram.hpp" #include "interpreter/interpreter.hpp" #include "interpreter/interpreterGenerator.hpp" #include "interpreter/interpreterRuntime.hpp" #include "interpreter/templateTable.hpp" #include "oops/arrayOop.hpp" #include "oops/methodData.hpp" #include "oops/method.hpp" #include "oops/oop.inline.hpp" #include "prims/jvmtiExport.hpp" #include "prims/jvmtiThreadState.hpp" #include "runtime/arguments.hpp" #include "runtime/deoptimization.hpp" #include "runtime/frame.inline.hpp" #include "runtime/sharedRuntime.hpp" #include "runtime/stubRoutines.hpp" #include "runtime/synchronizer.hpp" #include "runtime/timer.hpp" #include "runtime/vframeArray.hpp" #include "utilities/debug.hpp" #include "utilities/macros.hpp" #define __ _masm-> #ifndef CC_INTERP const int method_offset = frame::interpreter_frame_method_offset * wordSize; const int bci_offset = frame::interpreter_frame_bcx_offset * wordSize; const int locals_offset = frame::interpreter_frame_locals_offset * wordSize; //------------------------------------------------------------------------------------------------------------------------ address TemplateInterpreterGenerator::generate_StackOverflowError_handler() { address entry = __ pc(); // Note: There should be a minimal interpreter frame set up when stack // overflow occurs since we check explicitly for it now. // #ifdef ASSERT { Label L; __ lea(rax, Address(rbp, frame::interpreter_frame_monitor_block_top_offset * wordSize)); __ cmpptr(rax, rsp); // rax, = maximal rsp for current rbp, // (stack grows negative) __ jcc(Assembler::aboveEqual, L); // check if frame is complete __ stop ("interpreter frame not set up"); __ bind(L); } #endif // ASSERT // Restore bcp under the assumption that the current frame is still // interpreted __ restore_bcp(); // expression stack must be empty before entering the VM if an exception // happened __ empty_expression_stack(); __ empty_FPU_stack(); // throw exception __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::throw_StackOverflowError)); return entry; } address TemplateInterpreterGenerator::generate_ArrayIndexOutOfBounds_handler(const char* name) { address entry = __ pc(); // expression stack must be empty before entering the VM if an exception happened __ empty_expression_stack(); __ empty_FPU_stack(); // setup parameters // ??? convention: expect aberrant index in register rbx, __ lea(rax, ExternalAddress((address)name)); __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::throw_ArrayIndexOutOfBoundsException), rax, rbx); return entry; } address TemplateInterpreterGenerator::generate_ClassCastException_handler() { address entry = __ pc(); // object is at TOS __ pop(rax); // expression stack must be empty before entering the VM if an exception // happened __ empty_expression_stack(); __ empty_FPU_stack(); __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::throw_ClassCastException), rax); return entry; } address TemplateInterpreterGenerator::generate_exception_handler_common(const char* name, const char* message, bool pass_oop) { assert(!pass_oop || message == NULL, "either oop or message but not both"); address entry = __ pc(); if (pass_oop) { // object is at TOS __ pop(rbx); } // expression stack must be empty before entering the VM if an exception happened __ empty_expression_stack(); __ empty_FPU_stack(); // setup parameters __ lea(rax, ExternalAddress((address)name)); if (pass_oop) { __ call_VM(rax, CAST_FROM_FN_PTR(address, InterpreterRuntime::create_klass_exception), rax, rbx); } else { if (message != NULL) { __ lea(rbx, ExternalAddress((address)message)); } else { __ movptr(rbx, NULL_WORD); } __ call_VM(rax, CAST_FROM_FN_PTR(address, InterpreterRuntime::create_exception), rax, rbx); } // throw exception __ jump(ExternalAddress(Interpreter::throw_exception_entry())); return entry; } address TemplateInterpreterGenerator::generate_continuation_for(TosState state) { address entry = __ pc(); // NULL last_sp until next java call __ movptr(Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize), NULL_WORD); __ dispatch_next(state); return entry; } address TemplateInterpreterGenerator::generate_return_entry_for(TosState state, int step) { TosState incoming_state = state; address entry = __ pc(); #ifdef COMPILER2 // The FPU stack is clean if UseSSE >= 2 but must be cleaned in other cases if ((incoming_state == ftos && UseSSE < 1) || (incoming_state == dtos && UseSSE < 2)) { for (int i = 1; i < 8; i++) { __ ffree(i); } } else if (UseSSE < 2) { __ empty_FPU_stack(); } #endif if ((incoming_state == ftos && UseSSE < 1) || (incoming_state == dtos && UseSSE < 2)) { __ MacroAssembler::verify_FPU(1, "generate_return_entry_for compiled"); } else { __ MacroAssembler::verify_FPU(0, "generate_return_entry_for compiled"); } // In SSE mode, interpreter returns FP results in xmm0 but they need // to end up back on the FPU so it can operate on them. if (incoming_state == ftos && UseSSE >= 1) { __ subptr(rsp, wordSize); __ movflt(Address(rsp, 0), xmm0); __ fld_s(Address(rsp, 0)); __ addptr(rsp, wordSize); } else if (incoming_state == dtos && UseSSE >= 2) { __ subptr(rsp, 2*wordSize); __ movdbl(Address(rsp, 0), xmm0); __ fld_d(Address(rsp, 0)); __ addptr(rsp, 2*wordSize); } __ MacroAssembler::verify_FPU(state == ftos || state == dtos ? 1 : 0, "generate_return_entry_for in interpreter"); // Restore stack bottom in case i2c adjusted stack __ movptr(rsp, Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize)); // and NULL it as marker that rsp is now tos until next java call __ movptr(Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize), NULL_WORD); __ restore_bcp(); __ restore_locals(); Label L_got_cache, L_giant_index; if (EnableInvokeDynamic) { __ cmpb(Address(rsi, 0), Bytecodes::_invokedynamic); __ jcc(Assembler::equal, L_giant_index); } __ get_cache_and_index_at_bcp(rbx, rcx, 1, sizeof(u2)); __ bind(L_got_cache); __ movl(rbx, Address(rbx, rcx, Address::times_ptr, ConstantPoolCache::base_offset() + ConstantPoolCacheEntry::flags_offset())); __ andptr(rbx, 0xFF); __ lea(rsp, Address(rsp, rbx, Interpreter::stackElementScale())); __ dispatch_next(state, step); // out of the main line of code... if (EnableInvokeDynamic) { __ bind(L_giant_index); __ get_cache_and_index_at_bcp(rbx, rcx, 1, sizeof(u4)); __ jmp(L_got_cache); } return entry; } address TemplateInterpreterGenerator::generate_deopt_entry_for(TosState state, int step) { address entry = __ pc(); // In SSE mode, FP results are in xmm0 if (state == ftos && UseSSE > 0) { __ subptr(rsp, wordSize); __ movflt(Address(rsp, 0), xmm0); __ fld_s(Address(rsp, 0)); __ addptr(rsp, wordSize); } else if (state == dtos && UseSSE >= 2) { __ subptr(rsp, 2*wordSize); __ movdbl(Address(rsp, 0), xmm0); __ fld_d(Address(rsp, 0)); __ addptr(rsp, 2*wordSize); } __ MacroAssembler::verify_FPU(state == ftos || state == dtos ? 1 : 0, "generate_deopt_entry_for in interpreter"); // The stack is not extended by deopt but we must NULL last_sp as this // entry is like a "return". __ movptr(Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize), NULL_WORD); __ restore_bcp(); __ restore_locals(); // handle exceptions { Label L; const Register thread = rcx; __ get_thread(thread); __ cmpptr(Address(thread, Thread::pending_exception_offset()), (int32_t)NULL_WORD); __ jcc(Assembler::zero, L); __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::throw_pending_exception)); __ should_not_reach_here(); __ bind(L); } __ dispatch_next(state, step); return entry; } int AbstractInterpreter::BasicType_as_index(BasicType type) { int i = 0; switch (type) { case T_BOOLEAN: i = 0; break; case T_CHAR : i = 1; break; case T_BYTE : i = 2; break; case T_SHORT : i = 3; break; case T_INT : // fall through case T_LONG : // fall through case T_VOID : i = 4; break; case T_FLOAT : i = 5; break; // have to treat float and double separately for SSE case T_DOUBLE : i = 6; break; case T_OBJECT : // fall through case T_ARRAY : i = 7; break; default : ShouldNotReachHere(); } assert(0 <= i && i < AbstractInterpreter::number_of_result_handlers, "index out of bounds"); return i; } address TemplateInterpreterGenerator::generate_result_handler_for(BasicType type) { address entry = __ pc(); switch (type) { case T_BOOLEAN: __ c2bool(rax); break; case T_CHAR : __ andptr(rax, 0xFFFF); break; case T_BYTE : __ sign_extend_byte (rax); break; case T_SHORT : __ sign_extend_short(rax); break; case T_INT : /* nothing to do */ break; case T_DOUBLE : case T_FLOAT : { const Register t = InterpreterRuntime::SignatureHandlerGenerator::temp(); __ pop(t); // remove return address first // Must return a result for interpreter or compiler. In SSE // mode, results are returned in xmm0 and the FPU stack must // be empty. if (type == T_FLOAT && UseSSE >= 1) { // Load ST0 __ fld_d(Address(rsp, 0)); // Store as float and empty fpu stack __ fstp_s(Address(rsp, 0)); // and reload __ movflt(xmm0, Address(rsp, 0)); } else if (type == T_DOUBLE && UseSSE >= 2 ) { __ movdbl(xmm0, Address(rsp, 0)); } else { // restore ST0 __ fld_d(Address(rsp, 0)); } // and pop the temp __ addptr(rsp, 2 * wordSize); __ push(t); // restore return address } break; case T_OBJECT : // retrieve result from frame __ movptr(rax, Address(rbp, frame::interpreter_frame_oop_temp_offset*wordSize)); // and verify it __ verify_oop(rax); break; default : ShouldNotReachHere(); } __ ret(0); // return from result handler return entry; } address TemplateInterpreterGenerator::generate_safept_entry_for(TosState state, address runtime_entry) { address entry = __ pc(); __ push(state); __ call_VM(noreg, runtime_entry); __ dispatch_via(vtos, Interpreter::_normal_table.table_for(vtos)); return entry; } // Helpers for commoning out cases in the various type of method entries. // // increment invocation count & check for overflow // // Note: checking for negative value instead of overflow // so we have a 'sticky' overflow test // // rbx,: method // rcx: invocation counter // void InterpreterGenerator::generate_counter_incr(Label* overflow, Label* profile_method, Label* profile_method_continue) { Label done; // Note: In tiered we increment either counters in MethodCounters* or in MDO // depending if we're profiling or not. if (TieredCompilation) { int increment = InvocationCounter::count_increment; int mask = ((1 << Tier0InvokeNotifyFreqLog) - 1) << InvocationCounter::count_shift; Label no_mdo; if (ProfileInterpreter) { // Are we profiling? __ movptr(rax, Address(rbx, Method::method_data_offset())); __ testptr(rax, rax); __ jccb(Assembler::zero, no_mdo); // Increment counter in the MDO const Address mdo_invocation_counter(rax, in_bytes(MethodData::invocation_counter_offset()) + in_bytes(InvocationCounter::counter_offset())); __ increment_mask_and_jump(mdo_invocation_counter, increment, mask, rcx, false, Assembler::zero, overflow); __ jmpb(done); } __ bind(no_mdo); // Increment counter in MethodCounters const Address invocation_counter(rax, MethodCounters::invocation_counter_offset() + InvocationCounter::counter_offset()); __ get_method_counters(rbx, rax, done); __ increment_mask_and_jump(invocation_counter, increment, mask, rcx, false, Assembler::zero, overflow); __ bind(done); } else { const Address backedge_counter (rax, MethodCounters::backedge_counter_offset() + InvocationCounter::counter_offset()); const Address invocation_counter(rax, MethodCounters::invocation_counter_offset() + InvocationCounter::counter_offset()); __ get_method_counters(rbx, rax, done); if (ProfileInterpreter) { __ incrementl(Address(rax, MethodCounters::interpreter_invocation_counter_offset())); } // Update standard invocation counters __ movl(rcx, invocation_counter); __ incrementl(rcx, InvocationCounter::count_increment); __ movl(invocation_counter, rcx); // save invocation count __ movl(rax, backedge_counter); // load backedge counter __ andl(rax, InvocationCounter::count_mask_value); // mask out the status bits __ addl(rcx, rax); // add both counters // profile_method is non-null only for interpreted method so // profile_method != NULL == !native_call // BytecodeInterpreter only calls for native so code is elided. if (ProfileInterpreter && profile_method != NULL) { // Test to see if we should create a method data oop __ cmp32(rcx, ExternalAddress((address)&InvocationCounter::InterpreterProfileLimit)); __ jcc(Assembler::less, *profile_method_continue); // if no method data exists, go to profile_method __ test_method_data_pointer(rax, *profile_method); } __ cmp32(rcx, ExternalAddress((address)&InvocationCounter::InterpreterInvocationLimit)); __ jcc(Assembler::aboveEqual, *overflow); __ bind(done); } } void InterpreterGenerator::generate_counter_overflow(Label* do_continue) { // Asm interpreter on entry // rdi - locals // rsi - bcp // rbx, - method // rdx - cpool // rbp, - interpreter frame // C++ interpreter on entry // rsi - new interpreter state pointer // rbp - interpreter frame pointer // rbx - method // On return (i.e. jump to entry_point) [ back to invocation of interpreter ] // rbx, - method // rcx - rcvr (assuming there is one) // top of stack return address of interpreter caller // rsp - sender_sp // C++ interpreter only // rsi - previous interpreter state pointer // InterpreterRuntime::frequency_counter_overflow takes one argument // indicating if the counter overflow occurs at a backwards branch (non-NULL bcp). // The call returns the address of the verified entry point for the method or NULL // if the compilation did not complete (either went background or bailed out). __ movptr(rax, (intptr_t)false); __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::frequency_counter_overflow), rax); __ movptr(rbx, Address(rbp, method_offset)); // restore Method* // Preserve invariant that rsi/rdi contain bcp/locals of sender frame // and jump to the interpreted entry. __ jmp(*do_continue, relocInfo::none); } void InterpreterGenerator::generate_stack_overflow_check(void) { // see if we've got enough room on the stack for locals plus overhead. // the expression stack grows down incrementally, so the normal guard // page mechanism will work for that. // // Registers live on entry: // // Asm interpreter // rdx: number of additional locals this frame needs (what we must check) // rbx,: Method* // destroyed on exit // rax, // NOTE: since the additional locals are also always pushed (wasn't obvious in // generate_method_entry) so the guard should work for them too. // // monitor entry size: see picture of stack set (generate_method_entry) and frame_x86.hpp const int entry_size = frame::interpreter_frame_monitor_size() * wordSize; // total overhead size: entry_size + (saved rbp, thru expr stack bottom). // be sure to change this if you add/subtract anything to/from the overhead area const int overhead_size = -(frame::interpreter_frame_initial_sp_offset*wordSize) + entry_size; const int page_size = os::vm_page_size(); Label after_frame_check; // see if the frame is greater than one page in size. If so, // then we need to verify there is enough stack space remaining // for the additional locals. __ cmpl(rdx, (page_size - overhead_size)/Interpreter::stackElementSize); __ jcc(Assembler::belowEqual, after_frame_check); // compute rsp as if this were going to be the last frame on // the stack before the red zone Label after_frame_check_pop; __ push(rsi); const Register thread = rsi; __ get_thread(thread); const Address stack_base(thread, Thread::stack_base_offset()); const Address stack_size(thread, Thread::stack_size_offset()); // locals + overhead, in bytes __ lea(rax, Address(noreg, rdx, Interpreter::stackElementScale(), overhead_size)); #ifdef ASSERT Label stack_base_okay, stack_size_okay; // verify that thread stack base is non-zero __ cmpptr(stack_base, (int32_t)NULL_WORD); __ jcc(Assembler::notEqual, stack_base_okay); __ stop("stack base is zero"); __ bind(stack_base_okay); // verify that thread stack size is non-zero __ cmpptr(stack_size, 0); __ jcc(Assembler::notEqual, stack_size_okay); __ stop("stack size is zero"); __ bind(stack_size_okay); #endif // Add stack base to locals and subtract stack size __ addptr(rax, stack_base); __ subptr(rax, stack_size); // Use the maximum number of pages we might bang. const int max_pages = StackShadowPages > (StackRedPages+StackYellowPages) ? StackShadowPages : (StackRedPages+StackYellowPages); __ addptr(rax, max_pages * page_size); // check against the current stack bottom __ cmpptr(rsp, rax); __ jcc(Assembler::above, after_frame_check_pop); __ pop(rsi); // get saved bcp / (c++ prev state ). // Restore sender's sp as SP. This is necessary if the sender's // frame is an extended compiled frame (see gen_c2i_adapter()) // and safer anyway in case of JSR292 adaptations. __ pop(rax); // return address must be moved if SP is changed __ mov(rsp, rsi); __ push(rax); // Note: the restored frame is not necessarily interpreted. // Use the shared runtime version of the StackOverflowError. assert(StubRoutines::throw_StackOverflowError_entry() != NULL, "stub not yet generated"); __ jump(ExternalAddress(StubRoutines::throw_StackOverflowError_entry())); // all done with frame size check __ bind(after_frame_check_pop); __ pop(rsi); __ bind(after_frame_check); } // Allocate monitor and lock method (asm interpreter) // rbx, - Method* // void InterpreterGenerator::lock_method(void) { // synchronize method const Address access_flags (rbx, Method::access_flags_offset()); const Address monitor_block_top (rbp, frame::interpreter_frame_monitor_block_top_offset * wordSize); const int entry_size = frame::interpreter_frame_monitor_size() * wordSize; #ifdef ASSERT { Label L; __ movl(rax, access_flags); __ testl(rax, JVM_ACC_SYNCHRONIZED); __ jcc(Assembler::notZero, L); __ stop("method doesn't need synchronization"); __ bind(L); } #endif // ASSERT // get synchronization object { Label done; const int mirror_offset = in_bytes(Klass::java_mirror_offset()); __ movl(rax, access_flags); __ testl(rax, JVM_ACC_STATIC); __ movptr(rax, Address(rdi, Interpreter::local_offset_in_bytes(0))); // get receiver (assume this is frequent case) __ jcc(Assembler::zero, done); __ movptr(rax, Address(rbx, Method::const_offset())); __ movptr(rax, Address(rax, ConstMethod::constants_offset())); __ movptr(rax, Address(rax, ConstantPool::pool_holder_offset_in_bytes())); __ movptr(rax, Address(rax, mirror_offset)); __ bind(done); } // add space for monitor & lock __ subptr(rsp, entry_size); // add space for a monitor entry __ movptr(monitor_block_top, rsp); // set new monitor block top __ movptr(Address(rsp, BasicObjectLock::obj_offset_in_bytes()), rax); // store object __ mov(rdx, rsp); // object address __ lock_object(rdx); } // // Generate a fixed interpreter frame. This is identical setup for interpreted methods // and for native methods hence the shared code. void TemplateInterpreterGenerator::generate_fixed_frame(bool native_call) { // initialize fixed part of activation frame __ push(rax); // save return address __ enter(); // save old & set new rbp, __ push(rsi); // set sender sp __ push((int32_t)NULL_WORD); // leave last_sp as null __ movptr(rsi, Address(rbx,Method::const_offset())); // get ConstMethod* __ lea(rsi, Address(rsi,ConstMethod::codes_offset())); // get codebase __ push(rbx); // save Method* if (ProfileInterpreter) { Label method_data_continue; __ movptr(rdx, Address(rbx, in_bytes(Method::method_data_offset()))); __ testptr(rdx, rdx); __ jcc(Assembler::zero, method_data_continue); __ addptr(rdx, in_bytes(MethodData::data_offset())); __ bind(method_data_continue); __ push(rdx); // set the mdp (method data pointer) } else { __ push(0); } __ movptr(rdx, Address(rbx, Method::const_offset())); __ movptr(rdx, Address(rdx, ConstMethod::constants_offset())); __ movptr(rdx, Address(rdx, ConstantPool::cache_offset_in_bytes())); __ push(rdx); // set constant pool cache __ push(rdi); // set locals pointer if (native_call) { __ push(0); // no bcp } else { __ push(rsi); // set bcp } __ push(0); // reserve word for pointer to expression stack bottom __ movptr(Address(rsp, 0), rsp); // set expression stack bottom } // End of helpers // // Various method entries //------------------------------------------------------------------------------------------------------------------------ // // // Call an accessor method (assuming it is resolved, otherwise drop into vanilla (slow path) entry address InterpreterGenerator::generate_accessor_entry(void) { // rbx,: Method* // rcx: receiver (preserve for slow entry into asm interpreter) // rsi: senderSP must preserved for slow path, set SP to it on fast path address entry_point = __ pc(); Label xreturn_path; // do fastpath for resolved accessor methods if (UseFastAccessorMethods) { Label slow_path; // If we need a safepoint check, generate full interpreter entry. ExternalAddress state(SafepointSynchronize::address_of_state()); __ cmp32(ExternalAddress(SafepointSynchronize::address_of_state()), SafepointSynchronize::_not_synchronized); __ jcc(Assembler::notEqual, slow_path); // ASM/C++ Interpreter // Code: _aload_0, _(i|a)getfield, _(i|a)return or any rewrites thereof; parameter size = 1 // Note: We can only use this code if the getfield has been resolved // and if we don't have a null-pointer exception => check for // these conditions first and use slow path if necessary. // rbx,: method // rcx: receiver __ movptr(rax, Address(rsp, wordSize)); // check if local 0 != NULL and read field __ testptr(rax, rax); __ jcc(Assembler::zero, slow_path); // read first instruction word and extract bytecode @ 1 and index @ 2 __ movptr(rdx, Address(rbx, Method::const_offset())); __ movptr(rdi, Address(rdx, ConstMethod::constants_offset())); __ movl(rdx, Address(rdx, ConstMethod::codes_offset())); // Shift codes right to get the index on the right. // The bytecode fetched looks like <index><0xb4><0x2a> __ shrl(rdx, 2*BitsPerByte); __ shll(rdx, exact_log2(in_words(ConstantPoolCacheEntry::size()))); __ movptr(rdi, Address(rdi, ConstantPool::cache_offset_in_bytes())); // rax,: local 0 // rbx,: method // rcx: receiver - do not destroy since it is needed for slow path! // rcx: scratch // rdx: constant pool cache index // rdi: constant pool cache // rsi: sender sp // check if getfield has been resolved and read constant pool cache entry // check the validity of the cache entry by testing whether _indices field // contains Bytecode::_getfield in b1 byte. assert(in_words(ConstantPoolCacheEntry::size()) == 4, "adjust shift below"); __ movl(rcx, Address(rdi, rdx, Address::times_ptr, ConstantPoolCache::base_offset() + ConstantPoolCacheEntry::indices_offset())); __ shrl(rcx, 2*BitsPerByte); __ andl(rcx, 0xFF); __ cmpl(rcx, Bytecodes::_getfield); __ jcc(Assembler::notEqual, slow_path); // Note: constant pool entry is not valid before bytecode is resolved __ movptr(rcx, Address(rdi, rdx, Address::times_ptr, ConstantPoolCache::base_offset() + ConstantPoolCacheEntry::f2_offset())); __ movl(rdx, Address(rdi, rdx, Address::times_ptr, ConstantPoolCache::base_offset() + ConstantPoolCacheEntry::flags_offset())); Label notByte, notShort, notChar; const Address field_address (rax, rcx, Address::times_1); // Need to differentiate between igetfield, agetfield, bgetfield etc. // because they are different sizes. // Use the type from the constant pool cache __ shrl(rdx, ConstantPoolCacheEntry::tos_state_shift); // Make sure we don't need to mask rdx after the above shift ConstantPoolCacheEntry::verify_tos_state_shift(); __ cmpl(rdx, btos); __ jcc(Assembler::notEqual, notByte); __ load_signed_byte(rax, field_address); __ jmp(xreturn_path); __ bind(notByte); __ cmpl(rdx, stos); __ jcc(Assembler::notEqual, notShort); __ load_signed_short(rax, field_address); __ jmp(xreturn_path); __ bind(notShort); __ cmpl(rdx, ctos); __ jcc(Assembler::notEqual, notChar); __ load_unsigned_short(rax, field_address); __ jmp(xreturn_path); __ bind(notChar); #ifdef ASSERT Label okay; __ cmpl(rdx, atos); __ jcc(Assembler::equal, okay); __ cmpl(rdx, itos); __ jcc(Assembler::equal, okay); __ stop("what type is this?"); __ bind(okay); #endif // ASSERT // All the rest are a 32 bit wordsize // This is ok for now. Since fast accessors should be going away __ movptr(rax, field_address); __ bind(xreturn_path); // _ireturn/_areturn __ pop(rdi); // get return address __ mov(rsp, rsi); // set sp to sender sp __ jmp(rdi); // generate a vanilla interpreter entry as the slow path __ bind(slow_path); (void) generate_normal_entry(false); return entry_point; } return NULL; } // Method entry for java.lang.ref.Reference.get. address InterpreterGenerator::generate_Reference_get_entry(void) { #if INCLUDE_ALL_GCS // Code: _aload_0, _getfield, _areturn // parameter size = 1 // // The code that gets generated by this routine is split into 2 parts: // 1. The "intrinsified" code for G1 (or any SATB based GC), // 2. The slow path - which is an expansion of the regular method entry. // // Notes:- // * In the G1 code we do not check whether we need to block for // a safepoint. If G1 is enabled then we must execute the specialized // code for Reference.get (except when the Reference object is null) // so that we can log the value in the referent field with an SATB // update buffer. // If the code for the getfield template is modified so that the // G1 pre-barrier code is executed when the current method is // Reference.get() then going through the normal method entry // will be fine. // * The G1 code below can, however, check the receiver object (the instance // of java.lang.Reference) and jump to the slow path if null. If the // Reference object is null then we obviously cannot fetch the referent // and so we don't need to call the G1 pre-barrier. Thus we can use the // regular method entry code to generate the NPE. // // This code is based on generate_accessor_enty. // rbx,: Method* // rcx: receiver (preserve for slow entry into asm interpreter) // rsi: senderSP must preserved for slow path, set SP to it on fast path address entry = __ pc(); const int referent_offset = java_lang_ref_Reference::referent_offset; guarantee(referent_offset > 0, "referent offset not initialized"); if (UseG1GC) { Label slow_path; // Check if local 0 != NULL // If the receiver is null then it is OK to jump to the slow path. __ movptr(rax, Address(rsp, wordSize)); __ testptr(rax, rax); __ jcc(Assembler::zero, slow_path); // rax: local 0 (must be preserved across the G1 barrier call) // // rbx: method (at this point it's scratch) // rcx: receiver (at this point it's scratch) // rdx: scratch // rdi: scratch // // rsi: sender sp // Preserve the sender sp in case the pre-barrier // calls the runtime __ push(rsi); // Load the value of the referent field. const Address field_address(rax, referent_offset); __ movptr(rax, field_address); // Generate the G1 pre-barrier code to log the value of // the referent field in an SATB buffer. __ get_thread(rcx); __ g1_write_barrier_pre(noreg /* obj */, rax /* pre_val */, rcx /* thread */, rbx /* tmp */, true /* tosca_save */, true /* expand_call */); // _areturn __ pop(rsi); // get sender sp __ pop(rdi); // get return address __ mov(rsp, rsi); // set sp to sender sp __ jmp(rdi); __ bind(slow_path); (void) generate_normal_entry(false); return entry; } #endif // INCLUDE_ALL_GCS // If G1 is not enabled then attempt to go through the accessor entry point // Reference.get is an accessor return generate_accessor_entry(); } // // Interpreter stub for calling a native method. (asm interpreter) // This sets up a somewhat different looking stack for calling the native method // than the typical interpreter frame setup. // address InterpreterGenerator::generate_native_entry(bool synchronized) { // determine code generation flags bool inc_counter = UseCompiler || CountCompiledCalls; // rbx,: Method* // rsi: sender sp // rsi: previous interpreter state (C++ interpreter) must preserve address entry_point = __ pc(); const Address constMethod (rbx, Method::const_offset()); const Address access_flags (rbx, Method::access_flags_offset()); const Address size_of_parameters(rcx, ConstMethod::size_of_parameters_offset()); // get parameter size (always needed) __ movptr(rcx, constMethod); __ load_unsigned_short(rcx, size_of_parameters); // native calls don't need the stack size check since they have no expression stack // and the arguments are already on the stack and we only add a handful of words // to the stack // rbx,: Method* // rcx: size of parameters // rsi: sender sp __ pop(rax); // get return address // for natives the size of locals is zero // compute beginning of parameters (rdi) __ lea(rdi, Address(rsp, rcx, Interpreter::stackElementScale(), -wordSize)); // add 2 zero-initialized slots for native calls // NULL result handler __ push((int32_t)NULL_WORD); // NULL oop temp (mirror or jni oop result) __ push((int32_t)NULL_WORD); // initialize fixed part of activation frame generate_fixed_frame(true); // make sure method is native & not abstract #ifdef ASSERT __ movl(rax, access_flags); { Label L; __ testl(rax, JVM_ACC_NATIVE); __ jcc(Assembler::notZero, L); __ stop("tried to execute non-native method as native"); __ bind(L); } { Label L; __ testl(rax, JVM_ACC_ABSTRACT); __ jcc(Assembler::zero, L); __ stop("tried to execute abstract method in interpreter"); __ bind(L); } #endif // Since at this point in the method invocation the exception handler // would try to exit the monitor of synchronized methods which hasn't // been entered yet, we set the thread local variable // _do_not_unlock_if_synchronized to true. The remove_activation will // check this flag. __ get_thread(rax); const Address do_not_unlock_if_synchronized(rax, in_bytes(JavaThread::do_not_unlock_if_synchronized_offset())); __ movbool(do_not_unlock_if_synchronized, true); // increment invocation count & check for overflow Label invocation_counter_overflow; if (inc_counter) { generate_counter_incr(&invocation_counter_overflow, NULL, NULL); } Label continue_after_compile; __ bind(continue_after_compile); bang_stack_shadow_pages(true); // reset the _do_not_unlock_if_synchronized flag __ get_thread(rax); __ movbool(do_not_unlock_if_synchronized, false); // check for synchronized methods // Must happen AFTER invocation_counter check and stack overflow check, // so method is not locked if overflows. // if (synchronized) { lock_method(); } else { // no synchronization necessary #ifdef ASSERT { Label L; __ movl(rax, access_flags); __ testl(rax, JVM_ACC_SYNCHRONIZED); __ jcc(Assembler::zero, L); __ stop("method needs synchronization"); __ bind(L); } #endif } // start execution #ifdef ASSERT { Label L; const Address monitor_block_top (rbp, frame::interpreter_frame_monitor_block_top_offset * wordSize); __ movptr(rax, monitor_block_top); __ cmpptr(rax, rsp); __ jcc(Assembler::equal, L); __ stop("broken stack frame setup in interpreter"); __ bind(L); } #endif // jvmti/dtrace support __ notify_method_entry(); // work registers const Register method = rbx; const Register thread = rdi; const Register t = rcx; // allocate space for parameters __ get_method(method); __ movptr(t, Address(method, Method::const_offset())); __ load_unsigned_short(t, Address(t, ConstMethod::size_of_parameters_offset())); __ shlptr(t, Interpreter::logStackElementSize); __ addptr(t, 2*wordSize); // allocate two more slots for JNIEnv and possible mirror __ subptr(rsp, t); __ andptr(rsp, -(StackAlignmentInBytes)); // gcc needs 16 byte aligned stacks to do XMM intrinsics // get signature handler { Label L; __ movptr(t, Address(method, Method::signature_handler_offset())); __ testptr(t, t); __ jcc(Assembler::notZero, L); __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::prepare_native_call), method); __ get_method(method); __ movptr(t, Address(method, Method::signature_handler_offset())); __ bind(L); } // call signature handler assert(InterpreterRuntime::SignatureHandlerGenerator::from() == rdi, "adjust this code"); assert(InterpreterRuntime::SignatureHandlerGenerator::to () == rsp, "adjust this code"); assert(InterpreterRuntime::SignatureHandlerGenerator::temp() == t , "adjust this code"); // The generated handlers do not touch RBX (the method oop). // However, large signatures cannot be cached and are generated // each time here. The slow-path generator will blow RBX // sometime, so we must reload it after the call. __ call(t); __ get_method(method); // slow path call blows RBX on DevStudio 5.0 // result handler is in rax, // set result handler __ movptr(Address(rbp, frame::interpreter_frame_result_handler_offset*wordSize), rax); // pass mirror handle if static call { Label L; const int mirror_offset = in_bytes(Klass::java_mirror_offset()); __ movl(t, Address(method, Method::access_flags_offset())); __ testl(t, JVM_ACC_STATIC); __ jcc(Assembler::zero, L); // get mirror __ movptr(t, Address(method, Method:: const_offset())); __ movptr(t, Address(t, ConstMethod::constants_offset())); __ movptr(t, Address(t, ConstantPool::pool_holder_offset_in_bytes())); __ movptr(t, Address(t, mirror_offset)); // copy mirror into activation frame __ movptr(Address(rbp, frame::interpreter_frame_oop_temp_offset * wordSize), t); // pass handle to mirror __ lea(t, Address(rbp, frame::interpreter_frame_oop_temp_offset * wordSize)); __ movptr(Address(rsp, wordSize), t); __ bind(L); } // get native function entry point { Label L; __ movptr(rax, Address(method, Method::native_function_offset())); ExternalAddress unsatisfied(SharedRuntime::native_method_throw_unsatisfied_link_error_entry()); __ cmpptr(rax, unsatisfied.addr()); __ jcc(Assembler::notEqual, L); __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::prepare_native_call), method); __ get_method(method); __ movptr(rax, Address(method, Method::native_function_offset())); __ bind(L); } // pass JNIEnv __ get_thread(thread); __ lea(t, Address(thread, JavaThread::jni_environment_offset())); __ movptr(Address(rsp, 0), t); // set_last_Java_frame_before_call // It is enough that the pc() // points into the right code segment. It does not have to be the correct return pc. __ set_last_Java_frame(thread, noreg, rbp, __ pc()); // change thread state #ifdef ASSERT { Label L; __ movl(t, Address(thread, JavaThread::thread_state_offset())); __ cmpl(t, _thread_in_Java); __ jcc(Assembler::equal, L); __ stop("Wrong thread state in native stub"); __ bind(L); } #endif // Change state to native __ movl(Address(thread, JavaThread::thread_state_offset()), _thread_in_native); __ call(rax); // result potentially in rdx:rax or ST0 // Verify or restore cpu control state after JNI call __ restore_cpu_control_state_after_jni(); // save potential result in ST(0) & rdx:rax // (if result handler is the T_FLOAT or T_DOUBLE handler, result must be in ST0 - // the check is necessary to avoid potential Intel FPU overflow problems by saving/restoring 'empty' FPU registers) // It is safe to do this push because state is _thread_in_native and return address will be found // via _last_native_pc and not via _last_jave_sp // NOTE: the order of theses push(es) is known to frame::interpreter_frame_result. // If the order changes or anything else is added to the stack the code in // interpreter_frame_result will have to be changed. { Label L; Label push_double; ExternalAddress float_handler(AbstractInterpreter::result_handler(T_FLOAT)); ExternalAddress double_handler(AbstractInterpreter::result_handler(T_DOUBLE)); __ cmpptr(Address(rbp, (frame::interpreter_frame_oop_temp_offset + 1)*wordSize), float_handler.addr()); __ jcc(Assembler::equal, push_double); __ cmpptr(Address(rbp, (frame::interpreter_frame_oop_temp_offset + 1)*wordSize), double_handler.addr()); __ jcc(Assembler::notEqual, L); __ bind(push_double); __ push(dtos); __ bind(L); } __ push(ltos); // change thread state __ get_thread(thread); __ movl(Address(thread, JavaThread::thread_state_offset()), _thread_in_native_trans); if(os::is_MP()) { if (UseMembar) { // Force this write out before the read below __ membar(Assembler::Membar_mask_bits( Assembler::LoadLoad | Assembler::LoadStore | Assembler::StoreLoad | Assembler::StoreStore)); } else { // Write serialization page so VM thread can do a pseudo remote membar. // We use the current thread pointer to calculate a thread specific // offset to write to within the page. This minimizes bus traffic // due to cache line collision. __ serialize_memory(thread, rcx); } } if (AlwaysRestoreFPU) { // Make sure the control word is correct. __ fldcw(ExternalAddress(StubRoutines::addr_fpu_cntrl_wrd_std())); } // check for safepoint operation in progress and/or pending suspend requests { Label Continue; __ cmp32(ExternalAddress(SafepointSynchronize::address_of_state()), SafepointSynchronize::_not_synchronized); Label L; __ jcc(Assembler::notEqual, L); __ cmpl(Address(thread, JavaThread::suspend_flags_offset()), 0); __ jcc(Assembler::equal, Continue); __ bind(L); // Don't use call_VM as it will see a possible pending exception and forward it // and never return here preventing us from clearing _last_native_pc down below. // Also can't use call_VM_leaf either as it will check to see if rsi & rdi are // preserved and correspond to the bcp/locals pointers. So we do a runtime call // by hand. // __ push(thread); __ call(RuntimeAddress(CAST_FROM_FN_PTR(address, JavaThread::check_special_condition_for_native_trans))); __ increment(rsp, wordSize); __ get_thread(thread); __ bind(Continue); } // change thread state __ movl(Address(thread, JavaThread::thread_state_offset()), _thread_in_Java); __ reset_last_Java_frame(thread, true, true); // reset handle block __ movptr(t, Address(thread, JavaThread::active_handles_offset())); __ movptr(Address(t, JNIHandleBlock::top_offset_in_bytes()), NULL_WORD); // If result was an oop then unbox and save it in the frame { Label L; Label no_oop, store_result; ExternalAddress handler(AbstractInterpreter::result_handler(T_OBJECT)); __ cmpptr(Address(rbp, frame::interpreter_frame_result_handler_offset*wordSize), handler.addr()); __ jcc(Assembler::notEqual, no_oop); __ cmpptr(Address(rsp, 0), (int32_t)NULL_WORD); __ pop(ltos); __ testptr(rax, rax); __ jcc(Assembler::zero, store_result); // unbox __ movptr(rax, Address(rax, 0)); __ bind(store_result); __ movptr(Address(rbp, (frame::interpreter_frame_oop_temp_offset)*wordSize), rax); // keep stack depth as expected by pushing oop which will eventually be discarded __ push(ltos); __ bind(no_oop); } { Label no_reguard; __ cmpl(Address(thread, JavaThread::stack_guard_state_offset()), JavaThread::stack_guard_yellow_disabled); __ jcc(Assembler::notEqual, no_reguard); __ pusha(); __ call(RuntimeAddress(CAST_FROM_FN_PTR(address, SharedRuntime::reguard_yellow_pages))); __ popa(); __ bind(no_reguard); } // restore rsi to have legal interpreter frame, // i.e., bci == 0 <=> rsi == code_base() // Can't call_VM until bcp is within reasonable. __ get_method(method); // method is junk from thread_in_native to now. __ movptr(rsi, Address(method,Method::const_offset())); // get ConstMethod* __ lea(rsi, Address(rsi,ConstMethod::codes_offset())); // get codebase // handle exceptions (exception handling will handle unlocking!) { Label L; __ cmpptr(Address(thread, Thread::pending_exception_offset()), (int32_t)NULL_WORD); __ jcc(Assembler::zero, L); // Note: At some point we may want to unify this with the code used in call_VM_base(); // i.e., we should use the StubRoutines::forward_exception code. For now this // doesn't work here because the rsp is not correctly set at this point. __ MacroAssembler::call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::throw_pending_exception)); __ should_not_reach_here(); __ bind(L); } // do unlocking if necessary { Label L; __ movl(t, Address(method, Method::access_flags_offset())); __ testl(t, JVM_ACC_SYNCHRONIZED); __ jcc(Assembler::zero, L); // the code below should be shared with interpreter macro assembler implementation { Label unlock; // BasicObjectLock will be first in list, since this is a synchronized method. However, need // to check that the object has not been unlocked by an explicit monitorexit bytecode. const Address monitor(rbp, frame::interpreter_frame_initial_sp_offset * wordSize - (int)sizeof(BasicObjectLock)); __ lea(rdx, monitor); // address of first monitor __ movptr(t, Address(rdx, BasicObjectLock::obj_offset_in_bytes())); __ testptr(t, t); __ jcc(Assembler::notZero, unlock); // Entry already unlocked, need to throw exception __ MacroAssembler::call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::throw_illegal_monitor_state_exception)); __ should_not_reach_here(); __ bind(unlock); __ unlock_object(rdx); } __ bind(L); } // jvmti/dtrace support // Note: This must happen _after_ handling/throwing any exceptions since // the exception handler code notifies the runtime of method exits // too. If this happens before, method entry/exit notifications are // not properly paired (was bug - gri 11/22/99). __ notify_method_exit(vtos, InterpreterMacroAssembler::NotifyJVMTI); // restore potential result in rdx:rax, call result handler to restore potential result in ST0 & handle result __ pop(ltos); __ movptr(t, Address(rbp, frame::interpreter_frame_result_handler_offset*wordSize)); __ call(t); // remove activation __ movptr(t, Address(rbp, frame::interpreter_frame_sender_sp_offset * wordSize)); // get sender sp __ leave(); // remove frame anchor __ pop(rdi); // get return address __ mov(rsp, t); // set sp to sender sp __ jmp(rdi); if (inc_counter) { // Handle overflow of counter and compile method __ bind(invocation_counter_overflow); generate_counter_overflow(&continue_after_compile); } return entry_point; } // // Generic interpreted method entry to (asm) interpreter // address InterpreterGenerator::generate_normal_entry(bool synchronized) { // determine code generation flags bool inc_counter = UseCompiler || CountCompiledCalls; // rbx,: Method* // rsi: sender sp address entry_point = __ pc(); const Address constMethod (rbx, Method::const_offset()); const Address access_flags (rbx, Method::access_flags_offset()); const Address size_of_parameters(rdx, ConstMethod::size_of_parameters_offset()); const Address size_of_locals (rdx, ConstMethod::size_of_locals_offset()); // get parameter size (always needed) __ movptr(rdx, constMethod); __ load_unsigned_short(rcx, size_of_parameters); // rbx,: Method* // rcx: size of parameters // rsi: sender_sp (could differ from sp+wordSize if we were called via c2i ) __ load_unsigned_short(rdx, size_of_locals); // get size of locals in words __ subl(rdx, rcx); // rdx = no. of additional locals // see if we've got enough room on the stack for locals plus overhead. generate_stack_overflow_check(); // get return address __ pop(rax); // compute beginning of parameters (rdi) __ lea(rdi, Address(rsp, rcx, Interpreter::stackElementScale(), -wordSize)); // rdx - # of additional locals // allocate space for locals // explicitly initialize locals { Label exit, loop; __ testl(rdx, rdx); __ jcc(Assembler::lessEqual, exit); // do nothing if rdx <= 0 __ bind(loop); __ push((int32_t)NULL_WORD); // initialize local variables __ decrement(rdx); // until everything initialized __ jcc(Assembler::greater, loop); __ bind(exit); } // initialize fixed part of activation frame generate_fixed_frame(false); // make sure method is not native & not abstract #ifdef ASSERT __ movl(rax, access_flags); { Label L; __ testl(rax, JVM_ACC_NATIVE); __ jcc(Assembler::zero, L); __ stop("tried to execute native method as non-native"); __ bind(L); } { Label L; __ testl(rax, JVM_ACC_ABSTRACT); __ jcc(Assembler::zero, L); __ stop("tried to execute abstract method in interpreter"); __ bind(L); } #endif // Since at this point in the method invocation the exception handler // would try to exit the monitor of synchronized methods which hasn't // been entered yet, we set the thread local variable // _do_not_unlock_if_synchronized to true. The remove_activation will // check this flag. __ get_thread(rax); const Address do_not_unlock_if_synchronized(rax, in_bytes(JavaThread::do_not_unlock_if_synchronized_offset())); __ movbool(do_not_unlock_if_synchronized, true); // increment invocation count & check for overflow Label invocation_counter_overflow; Label profile_method; Label profile_method_continue; if (inc_counter) { generate_counter_incr(&invocation_counter_overflow, &profile_method, &profile_method_continue); if (ProfileInterpreter) { __ bind(profile_method_continue); } } Label continue_after_compile; __ bind(continue_after_compile); bang_stack_shadow_pages(false); // reset the _do_not_unlock_if_synchronized flag __ get_thread(rax); __ movbool(do_not_unlock_if_synchronized, false); // check for synchronized methods // Must happen AFTER invocation_counter check and stack overflow check, // so method is not locked if overflows. // if (synchronized) { // Allocate monitor and lock method lock_method(); } else { // no synchronization necessary #ifdef ASSERT { Label L; __ movl(rax, access_flags); __ testl(rax, JVM_ACC_SYNCHRONIZED); __ jcc(Assembler::zero, L); __ stop("method needs synchronization"); __ bind(L); } #endif } // start execution #ifdef ASSERT { Label L; const Address monitor_block_top (rbp, frame::interpreter_frame_monitor_block_top_offset * wordSize); __ movptr(rax, monitor_block_top); __ cmpptr(rax, rsp); __ jcc(Assembler::equal, L); __ stop("broken stack frame setup in interpreter"); __ bind(L); } #endif // jvmti support __ notify_method_entry(); __ dispatch_next(vtos); // invocation counter overflow if (inc_counter) { if (ProfileInterpreter) { // We have decided to profile this method in the interpreter __ bind(profile_method); __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::profile_method)); __ set_method_data_pointer_for_bcp(); __ get_method(rbx); __ jmp(profile_method_continue); } // Handle overflow of counter and compile method __ bind(invocation_counter_overflow); generate_counter_overflow(&continue_after_compile); } return entry_point; } //------------------------------------------------------------------------------------------------------------------------ // Entry points // // Here we generate the various kind of entries into the interpreter. // The two main entry type are generic bytecode methods and native call method. // These both come in synchronized and non-synchronized versions but the // frame layout they create is very similar. The other method entry // types are really just special purpose entries that are really entry // and interpretation all in one. These are for trivial methods like // accessor, empty, or special math methods. // // When control flow reaches any of the entry types for the interpreter // the following holds -> // // Arguments: // // rbx,: Method* // rcx: receiver // // // Stack layout immediately at entry // // [ return address ] <--- rsp // [ parameter n ] // ... // [ parameter 1 ] // [ expression stack ] (caller's java expression stack) // Assuming that we don't go to one of the trivial specialized // entries the stack will look like below when we are ready to execute // the first bytecode (or call the native routine). The register usage // will be as the template based interpreter expects (see interpreter_x86.hpp). // // local variables follow incoming parameters immediately; i.e. // the return address is moved to the end of the locals). // // [ monitor entry ] <--- rsp // ... // [ monitor entry ] // [ expr. stack bottom ] // [ saved rsi ] // [ current rdi ] // [ Method* ] // [ saved rbp, ] <--- rbp, // [ return address ] // [ local variable m ] // ... // [ local variable 1 ] // [ parameter n ] // ... // [ parameter 1 ] <--- rdi address AbstractInterpreterGenerator::generate_method_entry(AbstractInterpreter::MethodKind kind) { // determine code generation flags bool synchronized = false; address entry_point = NULL; switch (kind) { case Interpreter::zerolocals : break; case Interpreter::zerolocals_synchronized: synchronized = true; break; case Interpreter::native : entry_point = ((InterpreterGenerator*)this)->generate_native_entry(false); break; case Interpreter::native_synchronized : entry_point = ((InterpreterGenerator*)this)->generate_native_entry(true); break; case Interpreter::empty : entry_point = ((InterpreterGenerator*)this)->generate_empty_entry(); break; case Interpreter::accessor : entry_point = ((InterpreterGenerator*)this)->generate_accessor_entry(); break; case Interpreter::abstract : entry_point = ((InterpreterGenerator*)this)->generate_abstract_entry(); break; case Interpreter::java_lang_math_sin : // fall thru case Interpreter::java_lang_math_cos : // fall thru case Interpreter::java_lang_math_tan : // fall thru case Interpreter::java_lang_math_abs : // fall thru case Interpreter::java_lang_math_log : // fall thru case Interpreter::java_lang_math_log10 : // fall thru case Interpreter::java_lang_math_sqrt : // fall thru case Interpreter::java_lang_math_pow : // fall thru case Interpreter::java_lang_math_exp : entry_point = ((InterpreterGenerator*)this)->generate_math_entry(kind); break; case Interpreter::java_lang_ref_reference_get : entry_point = ((InterpreterGenerator*)this)->generate_Reference_get_entry(); break; default: fatal(err_msg("unexpected method kind: %d", kind)); break; } if (entry_point) return entry_point; return ((InterpreterGenerator*)this)->generate_normal_entry(synchronized); } // These should never be compiled since the interpreter will prefer // the compiled version to the intrinsic version. bool AbstractInterpreter::can_be_compiled(methodHandle m) { switch (method_kind(m)) { case Interpreter::java_lang_math_sin : // fall thru case Interpreter::java_lang_math_cos : // fall thru case Interpreter::java_lang_math_tan : // fall thru case Interpreter::java_lang_math_abs : // fall thru case Interpreter::java_lang_math_log : // fall thru case Interpreter::java_lang_math_log10 : // fall thru case Interpreter::java_lang_math_sqrt : // fall thru case Interpreter::java_lang_math_pow : // fall thru case Interpreter::java_lang_math_exp : return false; default: return true; } } // How much stack a method activation needs in words. int AbstractInterpreter::size_top_interpreter_activation(Method* method) { const int stub_code = 4; // see generate_call_stub // Save space for one monitor to get into the interpreted method in case // the method is synchronized int monitor_size = method->is_synchronized() ? 1*frame::interpreter_frame_monitor_size() : 0; // total overhead size: entry_size + (saved rbp, thru expr stack bottom). // be sure to change this if you add/subtract anything to/from the overhead area const int overhead_size = -frame::interpreter_frame_initial_sp_offset; const int extra_stack = Method::extra_stack_entries(); const int method_stack = (method->max_locals() + method->max_stack() + extra_stack) * Interpreter::stackElementWords; return overhead_size + method_stack + stub_code; } // asm based interpreter deoptimization helpers int AbstractInterpreter::layout_activation(Method* method, int tempcount, int popframe_extra_args, int moncount, int caller_actual_parameters, int callee_param_count, int callee_locals, frame* caller, frame* interpreter_frame, bool is_top_frame, bool is_bottom_frame) { // Note: This calculation must exactly parallel the frame setup // in AbstractInterpreterGenerator::generate_method_entry. // If interpreter_frame!=NULL, set up the method, locals, and monitors. // The frame interpreter_frame, if not NULL, is guaranteed to be the right size, // as determined by a previous call to this method. // It is also guaranteed to be walkable even though it is in a skeletal state // NOTE: return size is in words not bytes // fixed size of an interpreter frame: int max_locals = method->max_locals() * Interpreter::stackElementWords; int extra_locals = (method->max_locals() - method->size_of_parameters()) * Interpreter::stackElementWords; int overhead = frame::sender_sp_offset - frame::interpreter_frame_initial_sp_offset; // Our locals were accounted for by the caller (or last_frame_adjust on the transistion) // Since the callee parameters already account for the callee's params we only need to account for // the extra locals. int size = overhead + ((callee_locals - callee_param_count)*Interpreter::stackElementWords) + (moncount*frame::interpreter_frame_monitor_size()) + tempcount*Interpreter::stackElementWords + popframe_extra_args; if (interpreter_frame != NULL) { #ifdef ASSERT if (!EnableInvokeDynamic) // @@@ FIXME: Should we correct interpreter_frame_sender_sp in the calling sequences? // Probably, since deoptimization doesn't work yet. assert(caller->unextended_sp() == interpreter_frame->interpreter_frame_sender_sp(), "Frame not properly walkable"); assert(caller->sp() == interpreter_frame->sender_sp(), "Frame not properly walkable(2)"); #endif interpreter_frame->interpreter_frame_set_method(method); // NOTE the difference in using sender_sp and interpreter_frame_sender_sp // interpreter_frame_sender_sp is the original sp of the caller (the unextended_sp) // and sender_sp is fp+8 intptr_t* locals = interpreter_frame->sender_sp() + max_locals - 1; #ifdef ASSERT if (caller->is_interpreted_frame()) { assert(locals < caller->fp() + frame::interpreter_frame_initial_sp_offset, "bad placement"); } #endif interpreter_frame->interpreter_frame_set_locals(locals); BasicObjectLock* montop = interpreter_frame->interpreter_frame_monitor_begin(); BasicObjectLock* monbot = montop - moncount; interpreter_frame->interpreter_frame_set_monitor_end(monbot); // Set last_sp intptr_t* rsp = (intptr_t*) monbot - tempcount*Interpreter::stackElementWords - popframe_extra_args; interpreter_frame->interpreter_frame_set_last_sp(rsp); // All frames but the initial (oldest) interpreter frame we fill in have a // value for sender_sp that allows walking the stack but isn't // truly correct. Correct the value here. if (extra_locals != 0 && interpreter_frame->sender_sp() == interpreter_frame->interpreter_frame_sender_sp() ) { interpreter_frame->set_interpreter_frame_sender_sp(caller->sp() + extra_locals); } *interpreter_frame->interpreter_frame_cache_addr() = method->constants()->cache(); } return size; } //------------------------------------------------------------------------------------------------------------------------ // Exceptions void TemplateInterpreterGenerator::generate_throw_exception() { // Entry point in previous activation (i.e., if the caller was interpreted) Interpreter::_rethrow_exception_entry = __ pc(); const Register thread = rcx; // Restore sp to interpreter_frame_last_sp even though we are going // to empty the expression stack for the exception processing. __ movptr(Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize), NULL_WORD); // rax,: exception // rdx: return address/pc that threw exception __ restore_bcp(); // rsi points to call/send __ restore_locals(); // Entry point for exceptions thrown within interpreter code Interpreter::_throw_exception_entry = __ pc(); // expression stack is undefined here // rax,: exception // rsi: exception bcp __ verify_oop(rax); // expression stack must be empty before entering the VM in case of an exception __ empty_expression_stack(); __ empty_FPU_stack(); // find exception handler address and preserve exception oop __ call_VM(rdx, CAST_FROM_FN_PTR(address, InterpreterRuntime::exception_handler_for_exception), rax); // rax,: exception handler entry point // rdx: preserved exception oop // rsi: bcp for exception handler __ push_ptr(rdx); // push exception which is now the only value on the stack __ jmp(rax); // jump to exception handler (may be _remove_activation_entry!) // If the exception is not handled in the current frame the frame is removed and // the exception is rethrown (i.e. exception continuation is _rethrow_exception). // // Note: At this point the bci is still the bxi for the instruction which caused // the exception and the expression stack is empty. Thus, for any VM calls // at this point, GC will find a legal oop map (with empty expression stack). // In current activation // tos: exception // rsi: exception bcp // // JVMTI PopFrame support // Interpreter::_remove_activation_preserving_args_entry = __ pc(); __ empty_expression_stack(); __ empty_FPU_stack(); // Set the popframe_processing bit in pending_popframe_condition indicating that we are // currently handling popframe, so that call_VMs that may happen later do not trigger new // popframe handling cycles. __ get_thread(thread); __ movl(rdx, Address(thread, JavaThread::popframe_condition_offset())); __ orl(rdx, JavaThread::popframe_processing_bit); __ movl(Address(thread, JavaThread::popframe_condition_offset()), rdx); { // Check to see whether we are returning to a deoptimized frame. // (The PopFrame call ensures that the caller of the popped frame is // either interpreted or compiled and deoptimizes it if compiled.) // In this case, we can't call dispatch_next() after the frame is // popped, but instead must save the incoming arguments and restore // them after deoptimization has occurred. // // Note that we don't compare the return PC against the // deoptimization blob's unpack entry because of the presence of // adapter frames in C2. Label caller_not_deoptimized; __ movptr(rdx, Address(rbp, frame::return_addr_offset * wordSize)); __ super_call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::interpreter_contains), rdx); __ testl(rax, rax); __ jcc(Assembler::notZero, caller_not_deoptimized); // Compute size of arguments for saving when returning to deoptimized caller __ get_method(rax); __ movptr(rax, Address(rax, Method::const_offset())); __ load_unsigned_short(rax, Address(rax, ConstMethod::size_of_parameters_offset())); __ shlptr(rax, Interpreter::logStackElementSize); __ restore_locals(); __ subptr(rdi, rax); __ addptr(rdi, wordSize); // Save these arguments __ get_thread(thread); __ super_call_VM_leaf(CAST_FROM_FN_PTR(address, Deoptimization::popframe_preserve_args), thread, rax, rdi); __ remove_activation(vtos, rdx, /* throw_monitor_exception */ false, /* install_monitor_exception */ false, /* notify_jvmdi */ false); // Inform deoptimization that it is responsible for restoring these arguments __ get_thread(thread); __ movl(Address(thread, JavaThread::popframe_condition_offset()), JavaThread::popframe_force_deopt_reexecution_bit); // Continue in deoptimization handler __ jmp(rdx); __ bind(caller_not_deoptimized); } __ remove_activation(vtos, rdx, /* throw_monitor_exception */ false, /* install_monitor_exception */ false, /* notify_jvmdi */ false); // Finish with popframe handling // A previous I2C followed by a deoptimization might have moved the // outgoing arguments further up the stack. PopFrame expects the // mutations to those outgoing arguments to be preserved and other // constraints basically require this frame to look exactly as // though it had previously invoked an interpreted activation with // no space between the top of the expression stack (current // last_sp) and the top of stack. Rather than force deopt to // maintain this kind of invariant all the time we call a small // fixup routine to move the mutated arguments onto the top of our // expression stack if necessary. __ mov(rax, rsp); __ movptr(rbx, Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize)); __ get_thread(thread); // PC must point into interpreter here __ set_last_Java_frame(thread, noreg, rbp, __ pc()); __ super_call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::popframe_move_outgoing_args), thread, rax, rbx); __ get_thread(thread); __ reset_last_Java_frame(thread, true, true); // Restore the last_sp and null it out __ movptr(rsp, Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize)); __ movptr(Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize), NULL_WORD); __ restore_bcp(); __ restore_locals(); // The method data pointer was incremented already during // call profiling. We have to restore the mdp for the current bcp. if (ProfileInterpreter) { __ set_method_data_pointer_for_bcp(); } // Clear the popframe condition flag __ get_thread(thread); __ movl(Address(thread, JavaThread::popframe_condition_offset()), JavaThread::popframe_inactive); __ dispatch_next(vtos); // end of PopFrame support Interpreter::_remove_activation_entry = __ pc(); // preserve exception over this code sequence __ pop_ptr(rax); __ get_thread(thread); __ movptr(Address(thread, JavaThread::vm_result_offset()), rax); // remove the activation (without doing throws on illegalMonitorExceptions) __ remove_activation(vtos, rdx, false, true, false); // restore exception __ get_thread(thread); __ get_vm_result(rax, thread); // Inbetween activations - previous activation type unknown yet // compute continuation point - the continuation point expects // the following registers set up: // // rax: exception // rdx: return address/pc that threw exception // rsp: expression stack of caller // rbp: rbp, of caller __ push(rax); // save exception __ push(rdx); // save return address __ super_call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::exception_handler_for_return_address), thread, rdx); __ mov(rbx, rax); // save exception handler __ pop(rdx); // restore return address __ pop(rax); // restore exception // Note that an "issuing PC" is actually the next PC after the call __ jmp(rbx); // jump to exception handler of caller } // // JVMTI ForceEarlyReturn support // address TemplateInterpreterGenerator::generate_earlyret_entry_for(TosState state) { address entry = __ pc(); const Register thread = rcx; __ restore_bcp(); __ restore_locals(); __ empty_expression_stack(); __ empty_FPU_stack(); __ load_earlyret_value(state); __ get_thread(thread); __ movptr(rcx, Address(thread, JavaThread::jvmti_thread_state_offset())); const Address cond_addr(rcx, JvmtiThreadState::earlyret_state_offset()); // Clear the earlyret state __ movl(cond_addr, JvmtiThreadState::earlyret_inactive); __ remove_activation(state, rsi, false, /* throw_monitor_exception */ false, /* install_monitor_exception */ true); /* notify_jvmdi */ __ jmp(rsi); return entry; } // end of ForceEarlyReturn support //------------------------------------------------------------------------------------------------------------------------ // Helper for vtos entry point generation void TemplateInterpreterGenerator::set_vtos_entry_points (Template* t, address& bep, address& cep, address& sep, address& aep, address& iep, address& lep, address& fep, address& dep, address& vep) { assert(t->is_valid() && t->tos_in() == vtos, "illegal template"); Label L; fep = __ pc(); __ push(ftos); __ jmp(L); dep = __ pc(); __ push(dtos); __ jmp(L); lep = __ pc(); __ push(ltos); __ jmp(L); aep = __ pc(); __ push(atos); __ jmp(L); bep = cep = sep = // fall through iep = __ pc(); __ push(itos); // fall through vep = __ pc(); __ bind(L); // fall through generate_and_dispatch(t); } //------------------------------------------------------------------------------------------------------------------------ // Generation of individual instructions // helpers for generate_and_dispatch InterpreterGenerator::InterpreterGenerator(StubQueue* code) : TemplateInterpreterGenerator(code) { generate_all(); // down here so it can be "virtual" } //------------------------------------------------------------------------------------------------------------------------ // Non-product code #ifndef PRODUCT address TemplateInterpreterGenerator::generate_trace_code(TosState state) { address entry = __ pc(); // prepare expression stack __ pop(rcx); // pop return address so expression stack is 'pure' __ push(state); // save tosca // pass tosca registers as arguments & call tracer __ call_VM(noreg, CAST_FROM_FN_PTR(address, SharedRuntime::trace_bytecode), rcx, rax, rdx); __ mov(rcx, rax); // make sure return address is not destroyed by pop(state) __ pop(state); // restore tosca // return __ jmp(rcx); return entry; } void TemplateInterpreterGenerator::count_bytecode() { __ incrementl(ExternalAddress((address) &BytecodeCounter::_counter_value)); } void TemplateInterpreterGenerator::histogram_bytecode(Template* t) { __ incrementl(ExternalAddress((address) &BytecodeHistogram::_counters[t->bytecode()])); } void TemplateInterpreterGenerator::histogram_bytecode_pair(Template* t) { __ mov32(ExternalAddress((address) &BytecodePairHistogram::_index), rbx); __ shrl(rbx, BytecodePairHistogram::log2_number_of_codes); __ orl(rbx, ((int)t->bytecode()) << BytecodePairHistogram::log2_number_of_codes); ExternalAddress table((address) BytecodePairHistogram::_counters); Address index(noreg, rbx, Address::times_4); __ incrementl(ArrayAddress(table, index)); } void TemplateInterpreterGenerator::trace_bytecode(Template* t) { // Call a little run-time stub to avoid blow-up for each bytecode. // The run-time runtime saves the right registers, depending on // the tosca in-state for the given template. assert(Interpreter::trace_code(t->tos_in()) != NULL, "entry must have been generated"); __ call(RuntimeAddress(Interpreter::trace_code(t->tos_in()))); } void TemplateInterpreterGenerator::stop_interpreter_at() { Label L; __ cmp32(ExternalAddress((address) &BytecodeCounter::_counter_value), StopInterpreterAt); __ jcc(Assembler::notEqual, L); __ int3(); __ bind(L); } #endif // !PRODUCT #endif // CC_INTERP