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// Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
#include "vm/globals.h"
#if defined(TARGET_ARCH_IA32)
#include "vm/debugger.h"
#include "vm/code_patcher.h"
#include "vm/cpu.h"
#include "vm/disassembler.h"
#include "vm/object.h"
#include "vm/os.h"
#include "vm/stack_frame.h"
#include "vm/stub_code.h"
namespace dart {
// TODO(hausner): Handle captured variables.
RawInstance* ActivationFrame::GetLocalVarValue(intptr_t slot_index) {
uword var_address = fp() + slot_index * kWordSize;
return reinterpret_cast<RawInstance*>(
*reinterpret_cast<uword*>(var_address));
}
RawInstance* ActivationFrame::GetInstanceCallReceiver(
intptr_t num_actual_args) {
ASSERT(num_actual_args > 0); // At minimum we have a receiver on the stack.
// Stack pointer points to last argument that was pushed on the stack.
uword receiver_addr = sp() + ((num_actual_args - 1) * kWordSize);
return reinterpret_cast<RawInstance*>(
*reinterpret_cast<uword*>(receiver_addr));
}
void CodeBreakpoint::PatchFunctionReturn() {
uint8_t* code = reinterpret_cast<uint8_t*>(pc_ - 5);
ASSERT((code[0] == 0x89) && (code[1] == 0xEC)); // mov esp,ebp
ASSERT(code[2] == 0x5D); // pop ebp
ASSERT(code[3] == 0xC3); // ret
ASSERT(code[4] == 0x90); // nop
// Smash code with call instruction and relative target address.
uword stub_addr = StubCode::BreakpointReturnEntryPoint();
code[0] = 0xE8;
*reinterpret_cast<uword*>(&code[1]) = stub_addr - pc_;
CPU::FlushICache(pc_ - 5, 5);
}
void CodeBreakpoint::RestoreFunctionReturn() {
uint8_t* code = reinterpret_cast<uint8_t*>(pc_ - 5);
ASSERT(code[0] == 0xE8);
code[0] = 0x89;
code[1] = 0xEC; // mov esp,ebp
code[2] = 0x5D; // pop ebp
code[3] = 0xC3; // ret
code[4] = 0x90; // nop
CPU::FlushICache(pc_ - 5, 5);
}
} // namespace dart
#endif // defined TARGET_ARCH_IA32