Deoptimization support for accessors.

src/ia32/stub-cache-ia32.cc

Index: src/ia32/stub-cache-ia32.cc
diff --git a/src/ia32/stub-cache-ia32.cc b/src/ia32/stub-cache-ia32.cc
index 50a22129fe64efab5427a6e3cf7589e929bafe38..d98b76fcf4d2a589954f907cd00772f981ca4058 100644
--- a/src/ia32/stub-cache-ia32.cc
+++ b/src/ia32/stub-cache-ia32.cc
@@ -2647,10 +2647,12 @@ Handle<Code> StoreStubCompiler::CompileStoreCallback(
 }
 
 
-Handle<Code> StoreStubCompiler::CompileStoreViaSetter(
-    Handle<String> name,
-    Handle<JSObject> receiver,
-    Handle<JSObject> holder,
+#undef __
+#define __ ACCESS_MASM(masm)
+
+
+void StoreStubCompiler::GenerateStoreViaSetter(
+    MacroAssembler* masm,
     Handle<JSFunction> setter) {
   // ----------- S t a t e -------------
   //  -- eax    : value
@@ -2658,26 +2660,24 @@ Handle<Code> StoreStubCompiler::CompileStoreViaSetter(
   //  -- edx    : receiver
   //  -- esp[0] : return address
   // -----------------------------------
-  Label miss;
-
-  // Check that the maps haven't changed, preserving the name register.
-  __ push(ecx);
-  __ JumpIfSmi(edx, &miss);
-  CheckPrototypes(receiver, edx, holder, ebx, ecx, edi, name, &miss);
-  __ pop(ecx);
-
   {
-    FrameScope scope(masm(), StackFrame::INTERNAL);
+    FrameScope scope(masm, StackFrame::INTERNAL);
 
     // Save value register, so we can restore it later.
     __ push(eax);
 
-    // Call the JavaScript setter with the receiver and the value on the stack.
-    __ push(edx);
-    __ push(eax);
-    ParameterCount actual(1);
-    __ InvokeFunction(setter, actual, CALL_FUNCTION, NullCallWrapper(),
-                      CALL_AS_METHOD);
+    if (setter.is_null()) {

[Michael Starzinger, 2012/08/16 17:20:04]

Can we flip the condition, thereby the return point would visually be after the
InvokeFunction part, where it actually needs to be. That's visually more
intuitive (at least for me).

[Sven Panne, 2012/08/17 07:27:26]

Good point. Done here and on other platforms.

+      // If we generate a global code snippet for deoptimization only, remember
+      // the place to continue after deoptimization.
+      masm->isolate()->heap()->SetSetterStubDeoptPCOffset(masm->pc_offset());
+    } else {
+      // Call the JavaScript setter with receiver and value on the stack.
+      __ push(edx);
+      __ push(eax);
+      ParameterCount actual(1);
+      __ InvokeFunction(setter, actual, CALL_FUNCTION, NullCallWrapper(),
+                        CALL_AS_METHOD);
+    }
 
     // We have to return the passed value, not the return value of the setter.
     __ pop(eax);
@@ -2686,6 +2686,33 @@ Handle<Code> StoreStubCompiler::CompileStoreViaSetter(
     __ mov(esi, Operand(ebp, StandardFrameConstants::kContextOffset));
   }
   __ ret(0);
+}
+
+
+#undef __
+#define __ ACCESS_MASM(masm())
+
+
+Handle<Code> StoreStubCompiler::CompileStoreViaSetter(
+    Handle<String> name,
+    Handle<JSObject> receiver,
+    Handle<JSObject> holder,
+    Handle<JSFunction> setter) {
+  // ----------- S t a t e -------------
+  //  -- eax    : value
+  //  -- ecx    : name
+  //  -- edx    : receiver
+  //  -- esp[0] : return address
+  // -----------------------------------
+  Label miss;
+
+  // Check that the maps haven't changed, preserving the name register.
+  __ push(ecx);
+  __ JumpIfSmi(edx, &miss);
+  CheckPrototypes(receiver, edx, holder, ebx, ecx, edi, name, &miss);
+  __ pop(ecx);
+
+  GenerateStoreViaSetter(masm(), setter);
 
   __ bind(&miss);
   __ pop(ecx);