CallIC and KeyedCallIC not wrapping this.

src/arm/stub-cache-arm.cc

Index: src/arm/stub-cache-arm.cc
diff --git a/src/arm/stub-cache-arm.cc b/src/arm/stub-cache-arm.cc
index 675fdf49b23957adf20d95a26273c85345a55de0..e623ea1914ff06e96447bfca8f722042090bd58e 100644
--- a/src/arm/stub-cache-arm.cc
+++ b/src/arm/stub-cache-arm.cc
@@ -2332,8 +2332,9 @@ MaybeObject* CallStubCompiler::CompileCallConstant(Object* object,
       break;
 
     case STRING_CHECK:
-      if (!function->IsBuiltin()) {
-        // Calling non-builtins with a value as receiver requires boxing.
+      if (!function->IsBuiltin() && !function_info->strict_mode()) {

[Lasse Reichstein, 2011/02/16 13:34:30]

It would be great if we could just make all builtin functions strict, and drop
the IsBuiltin() check.

[Martin Maly, 2011/02/17 05:25:55]

Good idea, Lasse. If it is ok, I'll put this on my todo list rather than include
here. I looked for some place where all builtin functions are going through when
they are materialized (all of C, Asm and JS builtins) but am still looking for
the right spot where to flip the bit on the function's shared info.

+        // Calling non-strict non-builtins with a value as the receiver
+        // requires boxing.
         __ jmp(&miss);
       } else {
         // Check that the object is a two-byte string or a symbol.
@@ -2348,8 +2349,9 @@ MaybeObject* CallStubCompiler::CompileCallConstant(Object* object,
       break;
 
     case NUMBER_CHECK: {
-      if (!function->IsBuiltin()) {
-        // Calling non-builtins with a value as receiver requires boxing.
+      if (!function->IsBuiltin() && !function_info->strict_mode()) {
+        // Calling non-strict non-builtins with a value as the receiver
+        // requires boxing.
         __ jmp(&miss);
       } else {
         Label fast;
@@ -2369,8 +2371,9 @@ MaybeObject* CallStubCompiler::CompileCallConstant(Object* object,
     }
 
     case BOOLEAN_CHECK: {
-      if (!function->IsBuiltin()) {
-        // Calling non-builtins with a value as receiver requires boxing.
+      if (!function->IsBuiltin() && !function_info->strict_mode()) {
+        // Calling non-strict non-builtins with a value as the receiver
+        // requires boxing.
         __ jmp(&miss);
       } else {
         Label fast;