Very first steps for a debugger

runtime/vm/stub_code_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/code_generator.h"
 #include "vm/compiler.h"
 #include "vm/ic_data.h"
@@ skipping 1527 matching lines @@
   __ movl(EAX, Address(EBX, kWordSize));  // Target function.
 
   __ Bind(&call_target_function);
   // EAX: Target function.
   __ movl(EAX, FieldAddress(EAX, Function::code_offset()));
   __ movl(EAX, FieldAddress(EAX, Code::instructions_offset()));
   __ addl(EAX, Immediate(Instructions::HeaderSize() - kHeapObjectTag));
   __ jmp(EAX);
 }
 
+
+//  ECX: Function object

[siva, 2011/11/30 00:00:47]

Missing period after comment in all the comment lines in these two stubs.

[hausner, 2011/11/30 01:17:05]

Done.

+//  EDX: Arguments array
+//  TOS(0): return address (Dart code)
+void StubCode::GenerateBreakpointStaticStub(Assembler* assembler) {
+  __ EnterFrame(0);
+  __ pushl(ECX);
+  __ pushl(EDX);
+  __ CallRuntimeFromStub(kBreakpointRuntimeEntry);
+  __ popl(EDX);
+  __ popl(ECX);
+  __ LeaveFrame();
+  // Now call the static function
+  __ jmp(&StubCode::CallStaticFunctionLabel());
+}
+
+
+//  ECX: Inline cache data array
+//  EDX: Arguments array
+//  TOS(0): return address (Dart code)
+void StubCode::GenerateBreakpointDynamicStub(Assembler* assembler) {
+  __ EnterFrame(0);
+  __ pushl(ECX);
+  __ pushl(EDX);
+  __ CallRuntimeFromStub(kBreakpointRuntimeEntry);
+  __ popl(EDX);
+  __ popl(ECX);
+  __ LeaveFrame();
+  // Now call the dynamic function
+  __ jmp(&StubCode::InlineCacheLabel());
+}
+
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_IA32