// We jump to here if something goes wrong (one param is not a number of any
// sort or new-space allocation fails).
__ bind(&slow);
+
+ // Push arguments to the stack
__ push(r1);
__ push(r0);
+
+ if (Token::ADD == operation) {
+ // Test for string arguments before calling runtime.
+ // r1 : first argument
+ // r0 : second argument
+ // sp[0] : second argument
+ // sp[1] : first argument
+
+ Label not_strings, not_string1, string1;
+ __ tst(r1, Operand(kSmiTagMask));
+ __ b(eq, ¬_string1);
+ __ CompareObjectType(r1, r2, r2, FIRST_NONSTRING_TYPE);
+ __ b(ge, ¬_string1);
+
+ // First argument is a a string, test second.
+ __ tst(r0, Operand(kSmiTagMask));
+ __ b(eq, &string1);
+ __ CompareObjectType(r0, r2, r2, FIRST_NONSTRING_TYPE);
+ __ b(ge, &string1);
+
+ // First and second argument are strings.
+ __ TailCallRuntime(ExternalReference(Runtime::kStringAdd), 2, 1);
+
+ // Only first argument is a string.
+ __ bind(&string1);
+ __ mov(r0, Operand(2)); // Set number of arguments.
+ __ InvokeBuiltin(Builtins::STRING_ADD_LEFT, JUMP_JS);
+
+ // First argument was not a string, test second.
+ __ bind(¬_string1);
+ __ tst(r0, Operand(kSmiTagMask));
+ __ b(eq, ¬_strings);
+ __ CompareObjectType(r0, r2, r2, FIRST_NONSTRING_TYPE);
+ __ b(ge, ¬_strings);
+
+ // Only second argument is a string.
+ __ b(¬_strings);
+ __ mov(r0, Operand(2)); // Set number of arguments.
+ __ InvokeBuiltin(Builtins::STRING_ADD_RIGHT, JUMP_JS);
+
+ __ bind(¬_strings);
+ }
+
__ mov(r0, Operand(1)); // Set number of arguments.
__ InvokeBuiltin(builtin, JUMP_JS); // Tail call. No return.
__ push(rcx);
}
switch (op_) {
- case Token::ADD:
+ case Token::ADD: {
+ // Test for string arguments before calling runtime.
+ Label not_strings, both_strings, not_string1, string1;
+ Condition is_smi;
+ Result answer;
+ __ movq(rdx, Operand(rsp, 2 * kPointerSize)); // First argument.
+ __ movq(rax, Operand(rsp, 1 * kPointerSize)); // Second argument.
+ is_smi = masm->CheckSmi(rdx);
+ __ j(is_smi, ¬_string1);
+ __ CmpObjectType(rdx, FIRST_NONSTRING_TYPE, rdx);
+ __ j(above_equal, ¬_string1);
+
+ // First argument is a a string, test second.
+ is_smi = masm->CheckSmi(rax);
+ __ j(is_smi, &string1);
+ __ CmpObjectType(rax, FIRST_NONSTRING_TYPE, rax);
+ __ j(above_equal, &string1);
+
+ // First and second argument are strings.
+ Runtime::Function* f = Runtime::FunctionForId(Runtime::kStringAdd);
+ __ TailCallRuntime(ExternalReference(f), 2, f->result_size);
+
+ // Only first argument is a string.
+ __ bind(&string1);
+ __ InvokeBuiltin(Builtins::STRING_ADD_LEFT, JUMP_FUNCTION);
+
+ // First argument was not a string, test second.
+ __ bind(¬_string1);
+ is_smi = masm->CheckSmi(rax);
+ __ j(is_smi, ¬_strings);
+ __ CmpObjectType(rax, FIRST_NONSTRING_TYPE, rax);
+ __ j(above_equal, ¬_strings);
+
+ // Only second argument is a string.
+ __ InvokeBuiltin(Builtins::STRING_ADD_RIGHT, JUMP_FUNCTION);
+
+ __ bind(¬_strings);
+ // Neither argument is a string.
__ InvokeBuiltin(Builtins::ADD, JUMP_FUNCTION);
break;
+ }
case Token::SUB:
__ InvokeBuiltin(Builtins::SUB, JUMP_FUNCTION);
break;