zra@google.com
df2054dae7
R=fschneider@google.com, srdjan@google.com Review URL: https://codereview.chromium.org//22825023 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@27295 260f80e4-7a28-3924-810f-c04153c831b5
82 lines
2.7 KiB
C++
82 lines
2.7 KiB
C++
// Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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#include "vm/globals.h"
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#if defined(TARGET_ARCH_X64)
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#include "vm/debugger.h"
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#include "vm/assembler.h"
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#include "vm/cpu.h"
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#include "vm/stub_code.h"
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namespace dart {
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// TODO(hausner): Handle captured variables.
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RawInstance* ActivationFrame::GetLocalVarValue(intptr_t slot_index) {
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uword var_address = fp() + slot_index * kWordSize;
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return reinterpret_cast<RawInstance*>(
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*reinterpret_cast<uword*>(var_address));
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}
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RawInstance* ActivationFrame::GetInstanceCallReceiver(
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intptr_t num_actual_args) {
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ASSERT(num_actual_args > 0); // At minimum we have a receiver on the stack.
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// Stack pointer points to last argument that was pushed on the stack.
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uword receiver_addr = sp() + ((num_actual_args - 1) * kWordSize);
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return reinterpret_cast<RawInstance*>(
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*reinterpret_cast<uword*>(receiver_addr));
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}
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RawObject* ActivationFrame::GetClosureObject(intptr_t num_actual_args) {
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// At a minimum we have the closure object on the stack.
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ASSERT(num_actual_args > 0);
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// Stack pointer points to last argument that was pushed on the stack.
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uword closure_addr = sp() + ((num_actual_args - 1) * kWordSize);
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return reinterpret_cast<RawObject*>(
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*reinterpret_cast<uword*>(closure_addr));
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}
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void CodeBreakpoint::PatchFunctionReturn() {
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uint8_t* code = reinterpret_cast<uint8_t*>(pc_ - 13);
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ASSERT((code[0] == 0x4c) && (code[1] == 0x8b) && (code[2] == 0x7d) &&
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(code[3] == 0xf0)); // movq r15,[rbp-0x10]
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ASSERT((code[4] == 0x48) && (code[5] == 0x89) &&
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(code[6] == 0xec)); // mov rsp, rbp
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ASSERT(code[7] == 0x5d); // pop rbp
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ASSERT(code[8] == 0xc3); // ret
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ASSERT((code[9] == 0x0F) && (code[10] == 0x1F) && (code[11] == 0x40) &&
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(code[12] == 0x00)); // nops
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// Smash code with call instruction and relative target address.
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uword stub_addr = StubCode::BreakpointReturnEntryPoint();
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code[0] = 0x49;
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code[1] = 0xbb;
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*reinterpret_cast<uword*>(&code[2]) = stub_addr;
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code[10] = 0x41;
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code[11] = 0xff;
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code[12] = 0xd3;
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CPU::FlushICache(pc_ - 13, 13);
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}
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void CodeBreakpoint::RestoreFunctionReturn() {
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uint8_t* code = reinterpret_cast<uint8_t*>(pc_ - 13);
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ASSERT((code[0] == 0x49) && (code[1] == 0xbb));
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MemoryRegion code_region(reinterpret_cast<void*>(pc_ - 13), 13);
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Assembler assembler;
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assembler.ReturnPatchable();
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assembler.FinalizeInstructions(code_region);
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CPU::FlushICache(pc_ - 13, 13);
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}
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} // namespace dart
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#endif // defined TARGET_ARCH_X64
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