[es6] Initial steps towards a correct implementation of IsCallable.

src/full-codegen/ia32/full-codegen-ia32.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #if V8_TARGET_ARCH_IA32
 
 #include "src/code-factory.h"
 #include "src/code-stubs.h"
 #include "src/codegen.h"
 #include "src/compiler.h"
@@ skipping 4886 matching lines @@
     __ cmp(eax, isolate()->factory()->true_value());
     __ j(equal, if_true);
     __ cmp(eax, isolate()->factory()->false_value());
     Split(equal, if_true, if_false, fall_through);
   } else if (String::Equals(check, factory->undefined_string())) {
     __ cmp(eax, isolate()->factory()->undefined_value());
     __ j(equal, if_true);
     __ JumpIfSmi(eax, if_false);
     // Check for undetectable objects => true.
     __ mov(edx, FieldOperand(eax, HeapObject::kMapOffset));
-    __ movzx_b(ecx, FieldOperand(edx, Map::kBitFieldOffset));
-    __ test(ecx, Immediate(1 << Map::kIsUndetectable));
+    __ test_b(FieldOperand(edx, Map::kBitFieldOffset),
+              1 << Map::kIsUndetectable);
     Split(not_zero, if_true, if_false, fall_through);
   } else if (String::Equals(check, factory->function_string())) {
     __ JumpIfSmi(eax, if_false);
-    STATIC_ASSERT(NUM_OF_CALLABLE_SPEC_OBJECT_TYPES == 2);
-    __ CmpObjectType(eax, JS_FUNCTION_TYPE, edx);
-    __ j(equal, if_true);
-    __ CmpInstanceType(edx, JS_FUNCTION_PROXY_TYPE);
+    // Check for callable and not undetectable objects => true.
+    __ mov(edx, FieldOperand(eax, HeapObject::kMapOffset));
+    __ movzx_b(ecx, FieldOperand(edx, Map::kBitFieldOffset));
+    __ and_(ecx, (1 << Map::kIsCallable) | (1 << Map::kIsUndetectable));
+    __ cmp(ecx, 1 << Map::kIsCallable);
     Split(equal, if_true, if_false, fall_through);
   } else if (String::Equals(check, factory->object_string())) {
     __ JumpIfSmi(eax, if_false);
     __ cmp(eax, isolate()->factory()->null_value());
     __ j(equal, if_true);
-    __ CmpObjectType(eax, FIRST_NONCALLABLE_SPEC_OBJECT_TYPE, edx);
+    STATIC_ASSERT(LAST_SPEC_OBJECT_TYPE == LAST_TYPE);
+    __ CmpObjectType(eax, FIRST_SPEC_OBJECT_TYPE, edx);
     __ j(below, if_false);
-    __ CmpInstanceType(edx, LAST_NONCALLABLE_SPEC_OBJECT_TYPE);
-    __ j(above, if_false);
-    // Check for undetectable objects => false.
+    // Check for callable or undetectable objects => false.
     __ test_b(FieldOperand(edx, Map::kBitFieldOffset),
-              1 << Map::kIsUndetectable);
+              (1 << Map::kIsCallable) | (1 << Map::kIsUndetectable));
     Split(zero, if_true, if_false, fall_through);
 // clang-format off
 #define SIMD128_TYPE(TYPE, Type, type, lane_count, lane_type)   \
   } else if (String::Equals(check, factory->type##_string())) { \
     __ JumpIfSmi(eax, if_false);                                \
     __ cmp(FieldOperand(eax, HeapObject::kMapOffset),           \
            isolate()->factory()->type##_map());                 \
     Split(equal, if_true, if_false, fall_through);
   SIMD128_TYPES(SIMD128_TYPE)
 #undef SIMD128_TYPE
@@ skipping 293 matching lines @@
             Assembler::target_address_at(call_target_address,
                                          unoptimized_code));
   return OSR_AFTER_STACK_CHECK;
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_IA32