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e58b6e4d4c
Splitting breakpoints into SourceBreakpoint that represent a user-defined source location of a breakpoint, and CodeBreakpoint, which represents a code location. There can be more than one CodeBreakpoint per SourceBreakpoint, e.g. for functions that are also called as closures (and are thus compiled twice.) Functions are no longer compiled as a side effect of setting a breakpoint. When they eventually get compiled, the previously recorded SourceBreakpoint is found and a CodeBreakpoint is set. Review URL: https://chromiumcodereview.appspot.com//9581013 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@4891 260f80e4-7a28-3924-810f-c04153c831b5
69 lines
2 KiB
C++
69 lines
2 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_IA32)
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#include "vm/debugger.h"
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#include "vm/code_patcher.h"
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#include "vm/cpu.h"
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#include "vm/disassembler.h"
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#include "vm/object.h"
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#include "vm/os.h"
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#include "vm/stack_frame.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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void CodeBreakpoint::PatchFunctionReturn() {
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uint8_t* code = reinterpret_cast<uint8_t*>(pc_ - 5);
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ASSERT((code[0] == 0x89) && (code[1] == 0xEC)); // mov esp,ebp
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ASSERT(code[2] == 0x5D); // pop ebp
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ASSERT(code[3] == 0xC3); // ret
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ASSERT(code[4] == 0x90); // nop
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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] = 0xE8;
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*reinterpret_cast<uword*>(&code[1]) = stub_addr - pc_;
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CPU::FlushICache(pc_, 5);
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}
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void CodeBreakpoint::RestoreFunctionReturn() {
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uint8_t* code = reinterpret_cast<uint8_t*>(pc_ - 5);
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ASSERT(code[0] == 0xE8);
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code[0] = 0x89;
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code[1] = 0xEC; // mov esp,ebp
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code[2] = 0x5D; // pop ebp
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code[3] = 0xC3; // ret
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code[4] = 0x90; // nop
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CPU::FlushICache(pc_, 5);
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}
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} // namespace dart
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#endif // defined TARGET_ARCH_IA32
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