Reviewers: Erik Corry,

Description:
Check for undefined in the binary operation stub when convertion to
int32 for bitops.  undefined converts to zero in ToInt32 conversions.


Please review this at http://codereview.chromium.org/508020

SVN Base: http://v8.googlecode.com/svn/branches/bleeding_edge/

Affected files:
   M     src/ia32/codegen-ia32.cc


Index: src/ia32/codegen-ia32.cc
===================================================================
--- src/ia32/codegen-ia32.cc    (revision 3511)
+++ src/ia32/codegen-ia32.cc    (working copy)
@@ -7553,18 +7553,26 @@
                                           bool use_sse3,
                                           Label* conversion_failure) {
    // Check float operands.
-  Label arg1_is_object, arg2_is_object, load_arg2;
-  Label done;
+  Label arg1_is_object, check_undefined_arg1;
+  Label arg2_is_object, check_undefined_arg2;
+  Label load_arg2, done;

    __ test(edx, Immediate(kSmiTagMask));
    __ j(not_zero, &arg1_is_object);
    __ SmiUntag(edx);
    __ jmp(&load_arg2);

+  // If the argument is undefined it converts to zero (ECMA-262, section  
9.5).
+  __ bind(&check_undefined_arg1);
+  __ cmp(edx, Factory::undefined_value());
+  __ j(not_equal, conversion_failure);
+  __ mov(edx, Immediate(0));
+  __ jmp(&load_arg2);
+
    __ bind(&arg1_is_object);
    __ mov(ebx, FieldOperand(edx, HeapObject::kMapOffset));
    __ cmp(ebx, Factory::heap_number_map());
-  __ j(not_equal, conversion_failure);
+  __ j(not_equal, &check_undefined_arg1);
    // Get the untagged integer version of the edx heap number in ecx.
    IntegerConvert(masm, edx, use_sse3, conversion_failure);
    __ mov(edx, ecx);
@@ -7578,10 +7586,17 @@
    __ mov(ecx, eax);
    __ jmp(&done);

+  // If the argument is undefined it converts to zero (ECMA-262, section  
9.5).
+  __ bind(&check_undefined_arg2);
+  __ cmp(eax, Factory::undefined_value());
+  __ j(not_equal, conversion_failure);
+  __ mov(ecx, Immediate(0));
+  __ jmp(&done);
+
    __ bind(&arg2_is_object);
    __ mov(ebx, FieldOperand(eax, HeapObject::kMapOffset));
    __ cmp(ebx, Factory::heap_number_map());
-  __ j(not_equal, conversion_failure);
+  __ j(not_equal, &check_undefined_arg2);
    // Get the untagged integer version of the eax heap number in ecx.
    IntegerConvert(masm, eax, use_sse3, conversion_failure);
    __ bind(&done);


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