StepOver, StepInto, StepOut

runtime/vm/debugger_ia32.cc

 // 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 Breakpoint::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);
+}
+
+
+void Breakpoint::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);
+}
+
+
+
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_IA32