[builtins] Add support for NewTarget to Execution::New.

src/mips/builtins-mips.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_MIPS
 
 #include "src/codegen.h"
 #include "src/debug/debug.h"
 #include "src/deoptimizer.h"
 #include "src/full-codegen/full-codegen.h"
 #include "src/runtime/runtime.h"
 
 
 namespace v8 {
 namespace internal {
 
 
 #define __ ACCESS_MASM(masm)
 
 
 void Builtins::Generate_Adaptor(MacroAssembler* masm,
                                 CFunctionId id,
                                 BuiltinExtraArguments extra_args) {
   // ----------- S t a t e -------------
   //  -- a0                 : number of arguments excluding receiver
   //  -- a1                 : called function (only guaranteed when
   //  --                      extra_args requires it)
-  //  -- cp                 : context
   //  -- sp[0]              : last argument
   //  -- ...
   //  -- sp[4 * (argc - 1)] : first argument
   //  -- sp[4 * agrc]       : receiver
   // -----------------------------------
+  __ AssertFunction(a1);
+
+  // Make sure we operate in the context of the called function (for example
+  // ConstructStubs implemented in C++ will be run in the context of the caller
+  // instead of the callee, due to the way that [[Construct]] is defined for
+  // ordinary functions).
+  // TODO(bmeurer): Can we make this more robust?
+  __ lw(cp, FieldMemOperand(a1, JSFunction::kContextOffset));
 
   // Insert extra arguments.
   int num_extra_args = 0;
   if (extra_args == NEEDS_CALLED_FUNCTION) {
     num_extra_args = 1;
     __ push(a1);
   } else {
     DCHECK(extra_args == NO_EXTRA_ARGUMENTS);
   }
 
@@ skipping 680 matching lines @@
 
   __ bind(&okay);
 }
 
 
 static void Generate_JSEntryTrampolineHelper(MacroAssembler* masm,
                                              bool is_construct) {
   // Called from JSEntryStub::GenerateBody
 
   // ----------- S t a t e -------------
-  //  -- a0: code entry
+  //  -- a0: new.target
   //  -- a1: function
   //  -- a2: receiver_pointer
   //  -- a3: argc
   //  -- s0: argv
   // -----------------------------------
   ProfileEntryHookStub::MaybeCallEntryHook(masm);
 
   // Clear the context before we push it when entering the JS frame.
   __ mov(cp, zero_reg);
 
   // Enter an internal frame.
   {
     FrameScope scope(masm, StackFrame::INTERNAL);
 
-    // Set up the context from the function argument.
-    __ lw(cp, FieldMemOperand(a1, JSFunction::kContextOffset));
+    // Setup the context (we need to use the caller context from the isolate).
+    ExternalReference context_address(Isolate::kContextAddress,
+                                      masm->isolate());
+    __ li(cp, Operand(context_address));
+    __ lw(cp, MemOperand(cp));
 
     // Push the function and the receiver onto the stack.
     __ Push(a1, a2);
 
     // Check if we have enough stack space to push all arguments.
     // The function is the first thing that was pushed above after entering
     // the internal frame.
     const int kFunctionOffset =
         InternalFrameConstants::kCodeOffset - kPointerSize;
     // Clobbers a2.
     Generate_CheckStackOverflow(masm, kFunctionOffset, a3, kArgcIsUntaggedInt);
 
+    // Remember new.target.
+    __ mov(t1, a0);
+
     // Copy arguments to the stack in a loop.
     // a3: argc
     // s0: argv, i.e. points to first arg
     Label loop, entry;
     __ sll(t0, a3, kPointerSizeLog2);
     __ addu(t2, s0, t0);
     __ b(&entry);
     __ nop();   // Branch delay slot nop.
     // t2 points past last arg.
     __ bind(&loop);
     __ lw(t0, MemOperand(s0));  // Read next parameter.
     __ addiu(s0, s0, kPointerSize);
     __ lw(t0, MemOperand(t0));  // Dereference handle.
     __ push(t0);  // Push parameter.
     __ bind(&entry);
     __ Branch(&loop, ne, s0, Operand(t2));
 
+    // Setup new.target and argc.
+    __ mov(a0, a3);
+    __ mov(a3, t1);
+
     // Initialize all JavaScript callee-saved registers, since they will be seen
     // by the garbage collector as part of handlers.
     __ LoadRoot(t0, Heap::kUndefinedValueRootIndex);
     __ mov(s1, t0);
     __ mov(s2, t0);
     __ mov(s3, t0);
     __ mov(s4, t0);
     __ mov(s5, t0);
     // s6 holds the root address. Do not clobber.
     // s7 is cp. Do not init.
 
-    // Invoke the code and pass argc as a0.
-    __ mov(a0, a3);
-    if (is_construct) {
-      // No type feedback cell is available
-      __ LoadRoot(a2, Heap::kUndefinedValueRootIndex);
-      CallConstructStub stub(masm->isolate(), NO_CALL_CONSTRUCTOR_FLAGS);
-      __ CallStub(&stub);
-    } else {
-      __ Call(masm->isolate()->builtins()->Call(), RelocInfo::CODE_TARGET);
-    }
+    // Invoke the code.
+    Handle<Code> builtin = is_construct
+                               ? masm->isolate()->builtins()->Construct()
+                               : masm->isolate()->builtins()->Call();
+    __ Call(builtin, RelocInfo::CODE_TARGET);
 
     // Leave internal frame.
   }
 
   __ Jump(ra);
 }
 
 
 void Builtins::Generate_JSEntryTrampoline(MacroAssembler* masm) {
   Generate_JSEntryTrampolineHelper(masm, false);
@@ skipping 811 matching lines @@
     __ Pop(a0);
     __ sra(a0, a0, kSmiTagSize);  // Un-tag.
   }
   // The delegate is always a regular function.
   __ AssertFunction(a1);
   __ Jump(masm->isolate()->builtins()->CallFunction(), RelocInfo::CODE_TARGET);
 }
 
 
 // static
+void Builtins::Generate_ConstructFunction(MacroAssembler* masm) {
+  // ----------- S t a t e -------------
+  //  -- a0 : the number of arguments (not including the receiver)
+  //  -- a1 : the constructor to call (checked to be a JSFunction)
+  //  -- a3 : the original constructor (checked to be a JSFunction)
+  // -----------------------------------
+  __ AssertFunction(a1);
+  __ AssertFunction(a3);
+
+  // Calling convention for function specific ConstructStubs require
+  // a2 to contain either an AllocationSite or undefined.
+  __ LoadRoot(a2, Heap::kUndefinedValueRootIndex);
+
+  // Tail call to the function-specific construct stub (still in the caller
+  // context at this point).
+  __ lw(t0, FieldMemOperand(a1, JSFunction::kSharedFunctionInfoOffset));
+  __ lw(t0, FieldMemOperand(t0, SharedFunctionInfo::kConstructStubOffset));
+  __ Addu(at, t0, Operand(Code::kHeaderSize - kHeapObjectTag));
+  __ Jump(at);
+}
+
+
+// static
+void Builtins::Generate_Construct(MacroAssembler* masm) {
+  // ----------- S t a t e -------------
+  //  -- a0 : the number of arguments (not including the receiver)
+  //  -- a1 : the constructor to call (can be any Object)
+  //  -- a3 : the original constructor (either the same as the constructor or
+  //          the JSFunction on which new was invoked initially)
+  // -----------------------------------
+
+  Label slow;
+  __ JumpIfSmi(a1, &slow);
+  __ GetObjectType(a1, t1, t1);
+  __ Jump(masm->isolate()->builtins()->ConstructFunction(),
+          RelocInfo::CODE_TARGET, eq, t1, Operand(JS_FUNCTION_TYPE));
+  __ Branch(&slow, ne, t1, Operand(JS_FUNCTION_PROXY_TYPE));
+
+  // TODO(neis): This doesn't match the ES6 spec for [[Construct]] on proxies.
+  __ lw(a1, FieldMemOperand(a1, JSFunctionProxy::kConstructTrapOffset));
+  __ Jump(masm->isolate()->builtins()->Call(), RelocInfo::CODE_TARGET);
+
+  __ bind(&slow);
+  {
+    // Determine the delegate for the target (if any).
+    FrameScope scope(masm, StackFrame::INTERNAL);
+    __ SmiTag(a0);
+    __ Push(a0, a1);
+    __ CallRuntime(Runtime::kGetConstructorDelegate, 1);
+    __ mov(a1, v0);
+    __ Pop(a0);
+    __ SmiUntag(a0);
+  }
+  // The delegate is always a regular function.
+  __ AssertFunction(a1);
+  __ Jump(masm->isolate()->builtins()->CallFunction(), RelocInfo::CODE_TARGET);
+}
+
+
+// static
 void Builtins::Generate_PushArgsAndCall(MacroAssembler* masm) {
   // ----------- S t a t e -------------
   //  -- a0 : the number of arguments (not including the receiver)
   //  -- a2 : the address of the first argument to be pushed. Subsequent
   //          arguments should be consecutive above this, in the same order as
   //          they are to be pushed onto the stack.
   //  -- a1 : the target to call (can be any Object).
 
   // Find the address of the last argument.
   __ Addu(a3, a0, Operand(1));  // Add one for receiver.
@@ skipping 167 matching lines @@
   }
 }
 
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_MIPS