Strict mode function entry (Function.prototype.call/apply)

src/x64/builtins-x64.cc

Index: src/x64/builtins-x64.cc
diff --git a/src/x64/builtins-x64.cc b/src/x64/builtins-x64.cc
index 08cd21d41b00dbaf6a29341c80c211b17a01aec1..43ae7c37ef6b62510cc03f113c250cd04c3fa2bf 100644
--- a/src/x64/builtins-x64.cc
+++ b/src/x64/builtins-x64.cc
@@ -642,6 +642,13 @@ void Builtins::Generate_FunctionCall(MacroAssembler* masm) {
     // Change context eagerly in case we need the global receiver.
     __ movq(rsi, FieldOperand(rdi, JSFunction::kContextOffset));
 
+    // Do not transform the receiver for strict mode functions.
+    __ movq(rbx, FieldOperand(rdi, JSFunction::kSharedFunctionInfoOffset));
+    __ testb(FieldOperand(rbx, SharedFunctionInfo::kStrictModeByteOffset),
+             Immediate(1 << SharedFunctionInfo::kStrictModeBitWithinByte));
+    __ j(not_equal, &shift_arguments);
+
+    // Compute the receiver in non-strict mode.
     __ movq(rbx, Operand(rsp, rax, times_pointer_size, 0));
     __ JumpIfSmi(rbx, &convert_to_object);
 
@@ -798,6 +805,14 @@ void Builtins::Generate_FunctionApply(MacroAssembler* masm) {
   // Compute the receiver.
   Label call_to_object, use_global_receiver, push_receiver;
   __ movq(rbx, Operand(rbp, kReceiverOffset));
+
+  // Do not transform the receiver for strict mode functions.
+  __ movq(rdx, FieldOperand(rdi, JSFunction::kSharedFunctionInfoOffset));
+  __ testb(FieldOperand(rdx, SharedFunctionInfo::kStrictModeByteOffset),
+           Immediate(1 << SharedFunctionInfo::kStrictModeBitWithinByte));
+  __ j(not_equal, &push_receiver);
+
+  // Compute the receiver in non-strict mode.
   __ JumpIfSmi(rbx, &call_to_object);
   __ CompareRoot(rbx, Heap::kNullValueRootIndex);
   __ j(equal, &use_global_receiver);