Fix debugger stub patching on x64 architecture

runtime/vm/debugger_mips.cc

 // Copyright (c) 2013, 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_MIPS)
 
+#include "vm/code_patcher.h"
 #include "vm/cpu.h"
 #include "vm/debugger.h"
 #include "vm/instructions.h"
 #include "vm/stub_code.h"
 
 namespace dart {
 
 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));
 }
 
 
 RawObject* ActivationFrame::GetClosureObject(intptr_t num_actual_args) {
   // At a minimum we have the closure object on the stack.
   ASSERT(num_actual_args > 0);
   // Stack pointer points to last argument that was pushed on the stack.
   uword closure_addr = sp() + ((num_actual_args - 1) * kWordSize);
   return reinterpret_cast<RawObject*>(
              *reinterpret_cast<uword*>(closure_addr));
 }
 
+
+uword CodeBreakpoint::OrigStubAddress() const {
+  return saved_value_;
+}
+
+
+void CodeBreakpoint::PatchCode() {
+  ASSERT(!is_enabled_);
+  switch (breakpoint_kind_) {
+    case PcDescriptors::kIcCall: {
+      const Code& code =
+          Code::Handle(Function::Handle(function_).unoptimized_code());
+      saved_value_ = CodePatcher::GetInstanceCallAt(pc_, code, NULL);
+      CodePatcher::PatchInstanceCallAt(pc_, code,
+                                       StubCode::BreakpointDynamicEntryPoint());
+      break;
+    }
+    case PcDescriptors::kUnoptStaticCall: {
+      const Code& code =
+          Code::Handle(Function::Handle(function_).unoptimized_code());
+      saved_value_ = CodePatcher::GetStaticCallTargetAt(pc_, code);
+      CodePatcher::PatchStaticCallAt(pc_, code,
+                                     StubCode::BreakpointStaticEntryPoint());
+      break;
+    }
+    case PcDescriptors::kRuntimeCall:
+    case PcDescriptors::kClosureCall:
+    case PcDescriptors::kReturn: {
+      const Code& code =
+          Code::Handle(Function::Handle(function_).unoptimized_code());
+      saved_value_ = CodePatcher::GetStaticCallTargetAt(pc_, code);
+      CodePatcher::PatchStaticCallAt(pc_, code,
+                                     StubCode::BreakpointRuntimeEntryPoint());
+      break;
+    }
+    default:
+      UNREACHABLE();
+  }
+  is_enabled_ = true;
+}
+
+
+void CodeBreakpoint::RestoreCode() {
+  ASSERT(is_enabled_);
+  switch (breakpoint_kind_) {
+    case PcDescriptors::kIcCall: {
+      const Code& code =
+          Code::Handle(Function::Handle(function_).unoptimized_code());
+      CodePatcher::PatchInstanceCallAt(pc_, code, saved_value_);
+      break;
+    }
+    case PcDescriptors::kUnoptStaticCall:
+    case PcDescriptors::kClosureCall:
+    case PcDescriptors::kRuntimeCall:
+    case PcDescriptors::kReturn: {
+      const Code& code =
+          Code::Handle(Function::Handle(function_).unoptimized_code());
+      CodePatcher::PatchStaticCallAt(pc_, code, saved_value_);
+      break;
+    }
+    default:
+      UNREACHABLE();
+  }
+  is_enabled_ = false;
+}
+
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_MIPS