[WIP] Initial CallFunctionCallback builtin.

src/ia32/macro-assembler-ia32.cc

Index: src/ia32/macro-assembler-ia32.cc
diff --git a/src/ia32/macro-assembler-ia32.cc b/src/ia32/macro-assembler-ia32.cc
index 918c90df7bd5860bd6e2bc8c9fd108e7060fd672..390f0a000f1f711511b9c47b0e09f2ffc2c9ef33 100644
--- a/src/ia32/macro-assembler-ia32.cc
+++ b/src/ia32/macro-assembler-ia32.cc
@@ -892,6 +892,35 @@ void MacroAssembler::AssertUndefinedOrAllocationSite(Register object) {
   }
 }
 
+void MacroAssembler::AssertApiCallResult(Register object) {
+  if (emit_debug_code()) {
+    Label done_checking;
+    Push(object);
+
+    // Check for Smis.
+    JumpIfSmi(object, &done_checking, Label::kNear);
+
+    // Check for valid Oddballs.
+    JumpIfRoot(object, Heap::kTrueValueRootIndex, &done_checking, Label::kNear);
+    JumpIfRoot(object, Heap::kFalseValueRootIndex, &done_checking,
+               Label::kNear);
+    JumpIfRoot(object, Heap::kNullValueRootIndex, &done_checking, Label::kNear);
+    JumpIfRoot(object, Heap::kUndefinedValueRootIndex, &done_checking,
+               Label::kNear);
+
+    // Check for other primitives (String, Symbol and HeapNumber).
+    STATIC_ASSERT(LAST_PRIMITIVE_TYPE == ODDBALL_TYPE);
+    CmpObjectType(object, LAST_PRIMITIVE_TYPE, object);
+    j(below, &done_checking, Label::kNear);
+
+    // Check for JSReceivers.
+    CmpInstanceType(object, FIRST_JS_RECEIVER_TYPE);
+    Check(above_equal, kAPICallReturnedInvalidObject);
+
+    bind(&done_checking);
+    Pop(object);
+  }
+}
 
 void MacroAssembler::AssertNotSmi(Register object) {
   if (emit_debug_code()) {