Very first steps for a debugger

runtime/vm/stub_code_ia32.cc

Index: runtime/vm/stub_code_ia32.cc
===================================================================
--- runtime/vm/stub_code_ia32.cc	(revision 1899)
+++ runtime/vm/stub_code_ia32.cc	(working copy)
@@ -1545,6 +1545,38 @@
   __ 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