MIPS: [es6] implement Reflect.apply() & Reflect.construct()

src/mips/builtins-mips.cc

Index: src/mips/builtins-mips.cc
diff --git a/src/mips/builtins-mips.cc b/src/mips/builtins-mips.cc
index f8c112605c96f4e0bc1f0685e9e59ecabc57a5cc..2089e1a993076da76efbb1ee7b418a3df757a579 100644
--- a/src/mips/builtins-mips.cc
+++ b/src/mips/builtins-mips.cc
@@ -1351,49 +1351,99 @@ void Builtins::Generate_FunctionCall(MacroAssembler* masm) {
 }
 
 
-void Builtins::Generate_FunctionApply(MacroAssembler* masm) {
-  const int kIndexOffset    =
-      StandardFrameConstants::kExpressionsOffset - (2 * kPointerSize);
-  const int kLimitOffset    =
-      StandardFrameConstants::kExpressionsOffset - (1 * kPointerSize);
-  const int kArgsOffset     = 2 * kPointerSize;
-  const int kRecvOffset     = 3 * kPointerSize;
-  const int kFunctionOffset = 4 * kPointerSize;
+static void Generate_CheckStackOverflow(MacroAssembler* masm,
+                                        const int calleeOffset) {
+  // Check the stack for overflow. We are not trying to catch
+  // interruptions (e.g. debug break and preemption) here, so the "real stack
+  // limit" is checked.
+  Label okay;
+  __ LoadRoot(a2, Heap::kRealStackLimitRootIndex);
+  // Make a2 the space we have left. The stack might already be overflowed
+  // here which will cause a2 to become negative.
+  __ Subu(a2, sp, a2);
+  // Check if the arguments will overflow the stack.
+  __ sll(t3, v0, kPointerSizeLog2 - kSmiTagSize);
+  // Signed comparison.
+  __ Branch(&okay, gt, a2, Operand(t3));
+
+  // Out of stack space.
+  __ lw(a1, MemOperand(fp, calleeOffset));
+  __ Push(a1, v0);
+  __ InvokeBuiltin(Builtins::STACK_OVERFLOW, CALL_FUNCTION);
+
+  __ bind(&okay);
+}
+
+
+static void Generate_PushAppliedArguments(MacroAssembler* masm,
+                                          const int argumentsOffset,
+                                          const int indexOffset,
+                                          const int limitOffset) {
+  Label entry, loop;
+  __ lw(a0, MemOperand(fp, indexOffset));
+  __ Branch(&entry);
+
+  // Load the current argument from the arguments array and push it to the
+  // stack.
+  // a0: current argument index
+  __ bind(&loop);
+  __ lw(a1, MemOperand(fp, argumentsOffset));
+  __ Push(a1, a0);
+
+  // Call the runtime to access the property in the arguments array.
+  __ CallRuntime(Runtime::kGetProperty, 2);
+  __ push(v0);
+
+  // Use inline caching to access the arguments.
+  __ lw(a0, MemOperand(fp, indexOffset));
+  __ Addu(a0, a0, Operand(1 << kSmiTagSize));
+  __ sw(a0, MemOperand(fp, indexOffset));
+
+  // Test if the copy loop has finished copying all the elements from the
+  // arguments object.
+  __ bind(&entry);
+  __ lw(a1, MemOperand(fp, limitOffset));
+  __ Branch(&loop, ne, a0, Operand(a1));
+
+  // On exit, the pushed arguments count is in a0, untagged
+  __ SmiUntag(a0);
+}
+
+
+// Used by FunctionApply and ReflectApply
+static void Generate_ApplyHelper(MacroAssembler* masm, bool targetIsArgument) {
+  const int kFormalParameters = targetIsArgument ? 3 : 2;
+  const int kStackSize = kFormalParameters + 1;
 
   {
     FrameScope frame_scope(masm, StackFrame::INTERNAL);
+    const int kArgumentsOffset = kFPOnStackSize + kPCOnStackSize;
+    const int kReceiverOffset = kArgumentsOffset + kPointerSize;
+    const int kFunctionOffset = kReceiverOffset + kPointerSize;
+
     __ lw(a0, MemOperand(fp, kFunctionOffset));  // Get the function.
     __ push(a0);
-    __ lw(a0, MemOperand(fp, kArgsOffset));  // Get the args array.
+    __ lw(a0, MemOperand(fp, kArgumentsOffset));  // Get the args array.
     __ push(a0);
     // Returns (in v0) number of arguments to copy to stack as Smi.
-    __ InvokeBuiltin(Builtins::APPLY_PREPARE, CALL_FUNCTION);
-
-    // Check the stack for overflow. We are not trying to catch
-    // interruptions (e.g. debug break and preemption) here, so the "real stack
-    // limit" is checked.
-    Label okay;
-    __ LoadRoot(a2, Heap::kRealStackLimitRootIndex);
-    // Make a2 the space we have left. The stack might already be overflowed
-    // here which will cause a2 to become negative.
-    __ subu(a2, sp, a2);
-    // Check if the arguments will overflow the stack.
-    __ sll(t3, v0, kPointerSizeLog2 - kSmiTagSize);
-    __ Branch(&okay, gt, a2, Operand(t3));  // Signed comparison.
-
-    // Out of stack space.
-    __ lw(a1, MemOperand(fp, kFunctionOffset));
-    __ Push(a1, v0);
-    __ InvokeBuiltin(Builtins::STACK_OVERFLOW, CALL_FUNCTION);
-    // End of stack check.
+    if (targetIsArgument) {
+      __ InvokeBuiltin(Builtins::REFLECT_APPLY_PREPARE, CALL_FUNCTION);
+    } else {
+      __ InvokeBuiltin(Builtins::APPLY_PREPARE, CALL_FUNCTION);
+    }
+
+    Generate_CheckStackOverflow(masm, kFunctionOffset);
 
     // Push current limit and index.
-    __ bind(&okay);
+    const int kIndexOffset =
+        StandardFrameConstants::kExpressionsOffset - (2 * kPointerSize);
+    const int kLimitOffset =
+        StandardFrameConstants::kExpressionsOffset - (1 * kPointerSize);
     __ mov(a1, zero_reg);
     __ Push(v0, a1);  // Limit and initial index.
 
     // Get the receiver.
-    __ lw(a0, MemOperand(fp, kRecvOffset));
+    __ lw(a0, MemOperand(fp, kReceiverOffset));
 
     // Check that the function is a JS function (otherwise it must be a proxy).
     Label push_receiver;
@@ -1449,36 +1499,12 @@ void Builtins::Generate_FunctionApply(MacroAssembler* masm) {
     __ push(a0);
 
     // Copy all arguments from the array to the stack.
-    Label entry, loop;
-    __ lw(a0, MemOperand(fp, kIndexOffset));
-    __ Branch(&entry);
-
-    // Load the current argument from the arguments array and push it to the
-    // stack.
-    // a0: current argument index
-    __ bind(&loop);
-    __ lw(a1, MemOperand(fp, kArgsOffset));
-    __ Push(a1, a0);
-
-    // Call the runtime to access the property in the arguments array.
-    __ CallRuntime(Runtime::kGetProperty, 2);
-    __ push(v0);
-
-    // Use inline caching to access the arguments.
-    __ lw(a0, MemOperand(fp, kIndexOffset));
-    __ Addu(a0, a0, Operand(1 << kSmiTagSize));
-    __ sw(a0, MemOperand(fp, kIndexOffset));
-
-    // Test if the copy loop has finished copying all the elements from the
-    // arguments object.
-    __ bind(&entry);
-    __ lw(a1, MemOperand(fp, kLimitOffset));
-    __ Branch(&loop, ne, a0, Operand(a1));
+    Generate_PushAppliedArguments(
+        masm, kArgumentsOffset, kIndexOffset, kLimitOffset);
 
     // Call the function.
     Label call_proxy;
     ParameterCount actual(a0);
-    __ sra(a0, a0, kSmiTagSize);
     __ lw(a1, MemOperand(fp, kFunctionOffset));
     __ GetObjectType(a1, a2, a2);
     __ Branch(&call_proxy, ne, a2, Operand(JS_FUNCTION_TYPE));
@@ -1487,7 +1513,7 @@ void Builtins::Generate_FunctionApply(MacroAssembler* masm) {
 
     frame_scope.GenerateLeaveFrame();
     __ Ret(USE_DELAY_SLOT);
-    __ Addu(sp, sp, Operand(3 * kPointerSize));  // In delay slot.
+    __ Addu(sp, sp, Operand(kStackSize * kPointerSize));  // In delay slot.
 
     // Call the function proxy.
     __ bind(&call_proxy);
@@ -1505,6 +1531,86 @@ void Builtins::Generate_FunctionApply(MacroAssembler* masm) {
 }
 
 
+static void Generate_ConstructHelper(MacroAssembler* masm) {
+  const int kFormalParameters = 3;
+  const int kStackSize = kFormalParameters + 1;
+
+  {
+    FrameAndConstantPoolScope frame_scope(masm, StackFrame::INTERNAL);
+    const int kNewTargetOffset = kFPOnStackSize + kPCOnStackSize;
+    const int kArgumentsOffset = kNewTargetOffset + kPointerSize;
+    const int kFunctionOffset = kArgumentsOffset + kPointerSize;
+
+    // If newTarget is not supplied, set it to constructor
+    Label validate_arguments;
+    __ lw(a0, MemOperand(fp, kNewTargetOffset));
+    __ LoadRoot(at, Heap::kUndefinedValueRootIndex);
+    __ Branch(&validate_arguments, ne, a0, Operand(at));
+    __ lw(a0, MemOperand(fp, kFunctionOffset));
+    __ sw(a0, MemOperand(fp, kNewTargetOffset));
+
+    // Validate arguments
+    __ bind(&validate_arguments);
+    __ lw(a0, MemOperand(fp, kFunctionOffset));  // get the function
+    __ push(a0);
+    __ lw(a0, MemOperand(fp, kArgumentsOffset));  // get the args array
+    __ push(a0);
+    __ lw(a0, MemOperand(fp, kNewTargetOffset));  // get the new.target
+    __ push(a0);
+    __ InvokeBuiltin(Builtins::REFLECT_CONSTRUCT_PREPARE, CALL_FUNCTION);
+
+    Generate_CheckStackOverflow(masm, kFunctionOffset);
+
+    // Push current limit and index.
+    const int kIndexOffset =
+        StandardFrameConstants::kExpressionsOffset - (2 * kPointerSize);
+    const int kLimitOffset =
+        StandardFrameConstants::kExpressionsOffset - (1 * kPointerSize);
+    __ push(a0);  // limit
+    __ mov(a1, zero_reg);  // initial index
+    __ push(a1);
+    // Push newTarget and callee functions
+    __ lw(a0, MemOperand(fp, kNewTargetOffset));
+    __ push(a0);
+    __ lw(a0, MemOperand(fp, kFunctionOffset));
+    __ push(a0);
+
+    // Copy all arguments from the array to the stack.
+    Generate_PushAppliedArguments(
+        masm, kArgumentsOffset, kIndexOffset, kLimitOffset);
+
+    // Use undefined feedback vector
+    __ LoadRoot(a2, Heap::kUndefinedValueRootIndex);
+    __ lw(a1, MemOperand(fp, kFunctionOffset));
+
+    // Call the function.
+    CallConstructStub stub(masm->isolate(), SUPER_CONSTRUCTOR_CALL);
+    __ Call(stub.GetCode(), RelocInfo::CONSTRUCT_CALL);
+
+    __ Drop(1);
+
+    // Leave internal frame.
+  }
+  __ Addu(sp, sp, Operand(kStackSize * kPointerSize));
+  __ Jump(ra);
+}
+
+
+void Builtins::Generate_FunctionApply(MacroAssembler* masm) {
+  Generate_ApplyHelper(masm, false);
+}
+
+
+void Builtins::Generate_ReflectApply(MacroAssembler* masm) {
+  Generate_ApplyHelper(masm, true);
+}
+
+
+void Builtins::Generate_ReflectConstruct(MacroAssembler* masm) {
+  Generate_ConstructHelper(masm);
+}
+
+
 static void ArgumentAdaptorStackCheck(MacroAssembler* masm,
                                       Label* stack_overflow) {
   // ----------- S t a t e -------------