[builtins] Sanitize the machinery around Construct calls.

src/ia32/builtins-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/codegen.h"
 #include "src/deoptimizer.h"
 #include "src/full-codegen/full-codegen.h"
@@ skipping 1118 matching lines @@
     // Push the constructor function as callee.
     __ push(Operand(ebp, kFunctionOffset));
 
     // Loop over the arguments array, pushing each value to the stack
     Generate_PushAppliedArguments(masm, kVectorOffset, kArgumentsOffset,
                                   kIndexOffset, kLimitOffset);
 
     // Use undefined feedback vector
     __ LoadRoot(ebx, Heap::kUndefinedValueRootIndex);
     __ mov(edi, Operand(ebp, kFunctionOffset));
-    __ mov(ecx, Operand(ebp, kNewTargetOffset));
+    __ mov(edx, Operand(ebp, kNewTargetOffset));
 
     // Call the function.
-    CallConstructStub stub(masm->isolate(), SUPER_CONSTRUCTOR_CALL);
-    __ call(stub.GetCode(), RelocInfo::CONSTRUCT_CALL);
+    __ Call(masm->isolate()->builtins()->Construct(),
+            RelocInfo::CONSTRUCT_CALL);
 
     // Leave internal frame.
   }
   // remove this, target, arguments, and newTarget
   __ ret(kStackSize * kPointerSize);
 }
 
 
 void Builtins::Generate_FunctionApply(MacroAssembler* masm) {
   Generate_ApplyHelper(masm, false);
@@ skipping 472 matching lines @@
 
 // static
 void Builtins::Generate_Construct(MacroAssembler* masm) {
   // ----------- S t a t e -------------
   //  -- eax : the number of arguments (not including the receiver)
   //  -- edx : the new target (either the same as the constructor or
   //           the JSFunction on which new was invoked initially)
   //  -- edi : the constructor to call (can be any Object)
   // -----------------------------------
 
-  // Check if target has a [[Construct]] internal method.
+  // Check if target is a Smi.
   Label non_constructor;
   __ JumpIfSmi(edi, &non_constructor, Label::kNear);
-  __ mov(ecx, FieldOperand(edi, HeapObject::kMapOffset));
-  __ test_b(FieldOperand(ecx, Map::kBitFieldOffset), 1 << Map::kIsConstructor);
-  __ j(zero, &non_constructor, Label::kNear);
 
   // Dispatch based on instance type.
-  __ CmpInstanceType(ecx, JS_FUNCTION_TYPE);
+  __ CmpObjectType(edi, JS_FUNCTION_TYPE, ecx);
   __ j(equal, masm->isolate()->builtins()->ConstructFunction(),
        RelocInfo::CODE_TARGET);
   __ CmpInstanceType(ecx, JS_FUNCTION_PROXY_TYPE);
   __ j(equal, masm->isolate()->builtins()->ConstructProxy(),
        RelocInfo::CODE_TARGET);
 
+  // Check if target has a [[Construct]] internal method.
+  __ test_b(FieldOperand(ecx, Map::kBitFieldOffset), 1 << Map::kIsConstructor);
+  __ j(zero, &non_constructor, Label::kNear);
+
   // Called Construct on an exotic Object with a [[Construct]] internal method.
   {
     // Overwrite the original receiver with the (original) target.
     __ mov(Operand(esp, eax, times_pointer_size, kPointerSize), edi);
     // Let the "call_as_constructor_delegate" take care of the rest.
     __ LoadGlobalFunction(Context::CALL_AS_CONSTRUCTOR_DELEGATE_INDEX, edi);
     __ Jump(masm->isolate()->builtins()->CallFunction(),
             RelocInfo::CODE_TARGET);
   }
 
@@ skipping 189 matching lines @@
 
   __ bind(&ok);
   __ ret(0);
 }
 
 #undef __
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_IA32