[WIP] Initial CallFunctionCallback builtin.

src/arm/macro-assembler-arm.cc

Index: src/arm/macro-assembler-arm.cc
diff --git a/src/arm/macro-assembler-arm.cc b/src/arm/macro-assembler-arm.cc
index 30fb52729d0df377afc7b0404d0e81d2f94890e4..26d488d66222dcd6e87cefae46a53b37737863e0 100644
--- a/src/arm/macro-assembler-arm.cc
+++ b/src/arm/macro-assembler-arm.cc
@@ -2822,6 +2822,33 @@ 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);
+
+    // Check for valid Oddballs.
+    JumpIfRoot(object, Heap::kTrueValueRootIndex, &done_checking);
+    JumpIfRoot(object, Heap::kFalseValueRootIndex, &done_checking);
+    JumpIfRoot(object, Heap::kNullValueRootIndex, &done_checking);
+    JumpIfRoot(object, Heap::kUndefinedValueRootIndex, &done_checking);
+
+    // Check for other primitives (String, Symbol and HeapNumber).
+    STATIC_ASSERT(LAST_PRIMITIVE_TYPE == ODDBALL_TYPE);
+    CompareObjectType(object, object, object, LAST_PRIMITIVE_TYPE);
+    b(lo, &done_checking);
+
+    // Check for JSReceivers.
+    cmp(object, Operand(FIRST_JS_RECEIVER_TYPE));
+    Check(hs, kAPICallReturnedInvalidObject);
+
+    bind(&done_checking);
+    Pop(object);
+  }
+}
 
 void MacroAssembler::AssertIsRoot(Register reg, Heap::RootListIndex index) {
   if (emit_debug_code()) {