1719a1499a
Review URL: https://chromiumcodereview.appspot.com/10263002 git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11502 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
338 lines
11 KiB
C++
338 lines
11 KiB
C++
// Copyright 2012 the V8 project authors. All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#include "v8.h"
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#if defined(V8_TARGET_ARCH_MIPS)
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#include "codegen.h"
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#include "debug.h"
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namespace v8 {
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namespace internal {
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#ifdef ENABLE_DEBUGGER_SUPPORT
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bool BreakLocationIterator::IsDebugBreakAtReturn() {
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return Debug::IsDebugBreakAtReturn(rinfo());
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}
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void BreakLocationIterator::SetDebugBreakAtReturn() {
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// Mips return sequence:
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// mov sp, fp
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// lw fp, sp(0)
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// lw ra, sp(4)
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// addiu sp, sp, 8
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// addiu sp, sp, N
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// jr ra
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// nop (in branch delay slot)
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// Make sure this constant matches the number if instrucntions we emit.
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ASSERT(Assembler::kJSReturnSequenceInstructions == 7);
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CodePatcher patcher(rinfo()->pc(), Assembler::kJSReturnSequenceInstructions);
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// li and Call pseudo-instructions emit two instructions each.
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patcher.masm()->li(v8::internal::t9,
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Operand(reinterpret_cast<int32_t>(
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Isolate::Current()->debug()->debug_break_return()->entry())));
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patcher.masm()->Call(v8::internal::t9);
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patcher.masm()->nop();
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patcher.masm()->nop();
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patcher.masm()->nop();
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// TODO(mips): Open issue about using breakpoint instruction instead of nops.
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// patcher.masm()->bkpt(0);
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}
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// Restore the JS frame exit code.
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void BreakLocationIterator::ClearDebugBreakAtReturn() {
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rinfo()->PatchCode(original_rinfo()->pc(),
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Assembler::kJSReturnSequenceInstructions);
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}
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// A debug break in the exit code is identified by the JS frame exit code
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// having been patched with li/call psuedo-instrunction (liu/ori/jalr).
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bool Debug::IsDebugBreakAtReturn(RelocInfo* rinfo) {
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ASSERT(RelocInfo::IsJSReturn(rinfo->rmode()));
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return rinfo->IsPatchedReturnSequence();
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}
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bool BreakLocationIterator::IsDebugBreakAtSlot() {
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ASSERT(IsDebugBreakSlot());
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// Check whether the debug break slot instructions have been patched.
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return rinfo()->IsPatchedDebugBreakSlotSequence();
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}
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void BreakLocationIterator::SetDebugBreakAtSlot() {
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ASSERT(IsDebugBreakSlot());
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// Patch the code changing the debug break slot code from:
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// nop(DEBUG_BREAK_NOP) - nop(1) is sll(zero_reg, zero_reg, 1)
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// nop(DEBUG_BREAK_NOP)
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// nop(DEBUG_BREAK_NOP)
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// nop(DEBUG_BREAK_NOP)
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// to a call to the debug break slot code.
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// li t9, address (lui t9 / ori t9 instruction pair)
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// call t9 (jalr t9 / nop instruction pair)
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CodePatcher patcher(rinfo()->pc(), Assembler::kDebugBreakSlotInstructions);
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patcher.masm()->li(v8::internal::t9, Operand(reinterpret_cast<int32_t>(
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Isolate::Current()->debug()->debug_break_slot()->entry())));
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patcher.masm()->Call(v8::internal::t9);
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}
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void BreakLocationIterator::ClearDebugBreakAtSlot() {
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ASSERT(IsDebugBreakSlot());
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rinfo()->PatchCode(original_rinfo()->pc(),
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Assembler::kDebugBreakSlotInstructions);
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}
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const bool Debug::FramePaddingLayout::kIsSupported = false;
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#define __ ACCESS_MASM(masm)
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static void Generate_DebugBreakCallHelper(MacroAssembler* masm,
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RegList object_regs,
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RegList non_object_regs) {
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{
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FrameScope scope(masm, StackFrame::INTERNAL);
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// Store the registers containing live values on the expression stack to
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// make sure that these are correctly updated during GC. Non object values
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// are stored as a smi causing it to be untouched by GC.
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ASSERT((object_regs & ~kJSCallerSaved) == 0);
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ASSERT((non_object_regs & ~kJSCallerSaved) == 0);
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ASSERT((object_regs & non_object_regs) == 0);
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if ((object_regs | non_object_regs) != 0) {
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for (int i = 0; i < kNumJSCallerSaved; i++) {
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int r = JSCallerSavedCode(i);
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Register reg = { r };
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if ((non_object_regs & (1 << r)) != 0) {
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if (FLAG_debug_code) {
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__ And(at, reg, 0xc0000000);
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__ Assert(
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eq, "Unable to encode value as smi", at, Operand(zero_reg));
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}
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__ sll(reg, reg, kSmiTagSize);
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}
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}
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__ MultiPush(object_regs | non_object_regs);
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}
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#ifdef DEBUG
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__ RecordComment("// Calling from debug break to runtime - come in - over");
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#endif
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__ PrepareCEntryArgs(0); // No arguments.
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__ PrepareCEntryFunction(ExternalReference::debug_break(masm->isolate()));
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CEntryStub ceb(1);
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__ CallStub(&ceb);
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// Restore the register values from the expression stack.
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if ((object_regs | non_object_regs) != 0) {
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__ MultiPop(object_regs | non_object_regs);
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for (int i = 0; i < kNumJSCallerSaved; i++) {
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int r = JSCallerSavedCode(i);
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Register reg = { r };
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if ((non_object_regs & (1 << r)) != 0) {
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__ srl(reg, reg, kSmiTagSize);
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}
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if (FLAG_debug_code &&
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(((object_regs |non_object_regs) & (1 << r)) == 0)) {
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__ li(reg, kDebugZapValue);
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}
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}
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}
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// Leave the internal frame.
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}
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// Now that the break point has been handled, resume normal execution by
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// jumping to the target address intended by the caller and that was
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// overwritten by the address of DebugBreakXXX.
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__ li(t9, Operand(
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ExternalReference(Debug_Address::AfterBreakTarget(), masm->isolate())));
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__ lw(t9, MemOperand(t9));
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__ Jump(t9);
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}
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void Debug::GenerateLoadICDebugBreak(MacroAssembler* masm) {
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// Calling convention for IC load (from ic-mips.cc).
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// ----------- S t a t e -------------
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// -- a2 : name
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// -- ra : return address
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// -- a0 : receiver
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// -- [sp] : receiver
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// -----------------------------------
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// Registers a0 and a2 contain objects that need to be pushed on the
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// expression stack of the fake JS frame.
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Generate_DebugBreakCallHelper(masm, a0.bit() | a2.bit(), 0);
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}
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void Debug::GenerateStoreICDebugBreak(MacroAssembler* masm) {
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// Calling convention for IC store (from ic-mips.cc).
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// ----------- S t a t e -------------
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// -- a0 : value
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// -- a1 : receiver
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// -- a2 : name
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// -- ra : return address
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// -----------------------------------
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// Registers a0, a1, and a2 contain objects that need to be pushed on the
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// expression stack of the fake JS frame.
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Generate_DebugBreakCallHelper(masm, a0.bit() | a1.bit() | a2.bit(), 0);
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}
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void Debug::GenerateKeyedLoadICDebugBreak(MacroAssembler* masm) {
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// ---------- S t a t e --------------
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// -- ra : return address
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// -- a0 : key
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// -- a1 : receiver
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Generate_DebugBreakCallHelper(masm, a0.bit() | a1.bit(), 0);
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}
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void Debug::GenerateKeyedStoreICDebugBreak(MacroAssembler* masm) {
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// ---------- S t a t e --------------
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// -- a0 : value
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// -- a1 : key
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// -- a2 : receiver
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// -- ra : return address
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Generate_DebugBreakCallHelper(masm, a0.bit() | a1.bit() | a2.bit(), 0);
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}
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void Debug::GenerateCallICDebugBreak(MacroAssembler* masm) {
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// Calling convention for IC call (from ic-mips.cc).
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// ----------- S t a t e -------------
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// -- a2: name
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// -----------------------------------
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Generate_DebugBreakCallHelper(masm, a2.bit(), 0);
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}
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void Debug::GenerateReturnDebugBreak(MacroAssembler* masm) {
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// In places other than IC call sites it is expected that v0 is TOS which
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// is an object - this is not generally the case so this should be used with
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// care.
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Generate_DebugBreakCallHelper(masm, v0.bit(), 0);
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}
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void Debug::GenerateCallFunctionStubDebugBreak(MacroAssembler* masm) {
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// Register state for CallFunctionStub (from code-stubs-mips.cc).
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// ----------- S t a t e -------------
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// -- a1 : function
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// -----------------------------------
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Generate_DebugBreakCallHelper(masm, a1.bit(), 0);
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}
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void Debug::GenerateCallFunctionStubRecordDebugBreak(MacroAssembler* masm) {
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// Register state for CallFunctionStub (from code-stubs-mips.cc).
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// ----------- S t a t e -------------
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// -- a1 : function
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// -- a2 : cache cell for call target
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// -----------------------------------
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Generate_DebugBreakCallHelper(masm, a1.bit() | a2.bit(), 0);
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}
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void Debug::GenerateCallConstructStubDebugBreak(MacroAssembler* masm) {
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// Calling convention for CallConstructStub (from code-stubs-mips.cc).
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// ----------- S t a t e -------------
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// -- a0 : number of arguments (not smi)
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// -- a1 : constructor function
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// -----------------------------------
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Generate_DebugBreakCallHelper(masm, a1.bit() , a0.bit());
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}
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void Debug::GenerateCallConstructStubRecordDebugBreak(MacroAssembler* masm) {
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// Calling convention for CallConstructStub (from code-stubs-mips.cc).
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// ----------- S t a t e -------------
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// -- a0 : number of arguments (not smi)
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// -- a1 : constructor function
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// -- a2 : cache cell for call target
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// -----------------------------------
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Generate_DebugBreakCallHelper(masm, a1.bit() | a2.bit(), a0.bit());
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}
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void Debug::GenerateSlot(MacroAssembler* masm) {
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// Generate enough nop's to make space for a call instruction. Avoid emitting
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// the trampoline pool in the debug break slot code.
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Assembler::BlockTrampolinePoolScope block_trampoline_pool(masm);
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Label check_codesize;
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__ bind(&check_codesize);
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__ RecordDebugBreakSlot();
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for (int i = 0; i < Assembler::kDebugBreakSlotInstructions; i++) {
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__ nop(MacroAssembler::DEBUG_BREAK_NOP);
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}
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ASSERT_EQ(Assembler::kDebugBreakSlotInstructions,
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masm->InstructionsGeneratedSince(&check_codesize));
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}
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void Debug::GenerateSlotDebugBreak(MacroAssembler* masm) {
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// In the places where a debug break slot is inserted no registers can contain
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// object pointers.
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Generate_DebugBreakCallHelper(masm, 0, 0);
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}
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void Debug::GeneratePlainReturnLiveEdit(MacroAssembler* masm) {
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masm->Abort("LiveEdit frame dropping is not supported on mips");
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}
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void Debug::GenerateFrameDropperLiveEdit(MacroAssembler* masm) {
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masm->Abort("LiveEdit frame dropping is not supported on mips");
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}
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const bool Debug::kFrameDropperSupported = false;
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#undef __
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#endif // ENABLE_DEBUGGER_SUPPORT
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} } // namespace v8::internal
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#endif // V8_TARGET_ARCH_MIPS
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