StepOver, StepInto, StepOut

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/object_store.h"
@@ skipping 1698 matching lines @@
 
   // Now call the static function. The breakpoint handler function
   // ensures that the call target is compiled.
   __ movl(EAX, FieldAddress(ECX, Function::code_offset()));
   __ movl(ECX, FieldAddress(EAX, Code::instructions_offset()));
   __ addl(ECX, Immediate(Instructions::HeaderSize() - kHeapObjectTag));
   __ jmp(ECX);
 }
 
 
+//  TOS(0): return address (Dart code).
+void StubCode::GenerateBreakpointReturnStub(Assembler* assembler) {
+  __ EnterFrame(0);
+  __ pushl(EAX);
+  __ CallRuntimeFromStub(kBreakpointReturnHandlerRuntimeEntry);
+  __ popl(EAX);
+  __ LeaveFrame();
+
+  // Instead of returning to the patched Dart function, emulate the
+  // smashed return code pattern and return to the function's caller.
+  __ popl(ECX);  // Discard return address to patched dart code.
+  // Execute function epilog code that was smashed in the Dart code.
+  __ LeaveFrame();
+  __ ret();
+}
+
+
 //  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(kBreakpointDynamicHandlerRuntimeEntry);
   __ popl(EDX);
   __ popl(ECX);
   __ LeaveFrame();
-  // Now call the dynamic function.
+
+  // Find out which dispatch stub to call.
+  Label ic_cache_one_arg;
+  __ movl(EBX, FieldAddress(ECX, ICData::num_args_tested_offset()));
+  const Immediate value =
+      Immediate(reinterpret_cast<int32_t>(Smi::New(1)));
+  __ cmpl(EBX, value);
+  __ j(EQUAL, &ic_cache_one_arg, Assembler::kNearJump);
+  __ jmp(&StubCode::TwoArgsCheckInlineCacheLabel());
+  __ Bind(&ic_cache_one_arg);
   __ jmp(&StubCode::OneArgCheckInlineCacheLabel());
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_IA32