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

src/ia32/builtins-ia32.cc

 // Copyright 2010 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 571 matching lines @@
   __ CmpObjectType(edi, JS_FUNCTION_TYPE, ecx);
   __ j(not_equal, &non_function, not_taken);
 
 
   // 3a. Patch the first argument if necessary when calling a function.
   Label shift_arguments;
   { Label convert_to_object, use_global_receiver, patch_receiver;
     // Change context eagerly in case we need the global receiver.
     __ mov(esi, FieldOperand(edi, JSFunction::kContextOffset));
 
+    // Do not transform the receiver for strict mode functions.
+    __ mov(ebx, FieldOperand(edi, JSFunction::kSharedFunctionInfoOffset));
+    __ test_b(FieldOperand(ebx, SharedFunctionInfo::kStrictModeByteOffset),
+              1 << SharedFunctionInfo::kStrictModeBitWithinByte);
+    __ j(not_equal, &shift_arguments);
+
+    // Compute the receiver in non-strict mode.
     __ mov(ebx, Operand(esp, eax, times_4, 0));  // First argument.
     __ test(ebx, Immediate(kSmiTagMask));
     __ j(zero, &convert_to_object);
 
     __ cmp(ebx, Factory::null_value());
     __ j(equal, &use_global_receiver);
     __ cmp(ebx, Factory::undefined_value());
     __ j(equal, &use_global_receiver);
 
     // We don't use IsObjectJSObjectType here because we jump on success.
@@ skipping 127 matching lines @@
   __ push(Immediate(0));  // index
 
   // Change context eagerly to get the right global object if
   // necessary.
   __ mov(edi, Operand(ebp, 4 * kPointerSize));
   __ mov(esi, FieldOperand(edi, JSFunction::kContextOffset));
 
   // Compute the receiver.
   Label call_to_object, use_global_receiver, push_receiver;
   __ mov(ebx, Operand(ebp, 3 * kPointerSize));
+
+  // Do not transform the receiver for strict mode functions.
+  __ mov(ecx, FieldOperand(edi, JSFunction::kSharedFunctionInfoOffset));
+  __ test_b(FieldOperand(ecx, SharedFunctionInfo::kStrictModeByteOffset),
+            1 << SharedFunctionInfo::kStrictModeBitWithinByte);
+  __ j(not_equal, &push_receiver);
+
+  // Compute the receiver in non-strict mode.
   __ test(ebx, Immediate(kSmiTagMask));
   __ j(zero, &call_to_object);
   __ cmp(ebx, Factory::null_value());
   __ j(equal, &use_global_receiver);
   __ cmp(ebx, Factory::undefined_value());
   __ j(equal, &use_global_receiver);
 
   // If given receiver is already a JavaScript object then there's no
   // reason for converting it.
   // We don't use IsObjectJSObjectType here because we jump on success.
@@ skipping 817 matching lines @@
   Deoptimizer::EntryGenerator generator(masm, Deoptimizer::OSR);
   generator.Generate();
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32