Cleanup StringAddFlags.

src/mips/code-stubs-mips.cc

 // Copyright 2012 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 2126 matching lines @@
   // Test if left operand is a string.
   __ JumpIfSmi(left, &call_runtime);
   __ GetObjectType(left, a2, a2);
   __ Branch(&call_runtime, ge, a2, Operand(FIRST_NONSTRING_TYPE));
 
   // Test if right operand is a string.
   __ JumpIfSmi(right, &call_runtime);
   __ GetObjectType(right, a2, a2);
   __ Branch(&call_runtime, ge, a2, Operand(FIRST_NONSTRING_TYPE));
 
-  StringAddStub string_add_stub((StringAddFlags)
-                                (ERECT_FRAME | NO_STRING_CHECK_IN_STUB));
+  StringAddStub string_add_stub(
+      (StringAddFlags)(STRING_ADD_CHECK_NONE | STRING_ADD_ERECT_FRAME));
   GenerateRegisterArgsPush(masm);
   __ TailCallStub(&string_add_stub);
 
   __ bind(&call_runtime);
   GenerateTypeTransition(masm);
 }
 
 
 void BinaryOpStub::GenerateInt32Stub(MacroAssembler* masm) {
   ASSERT(Max(left_type_, right_type_) == BinaryOpIC::INT32);
@@ skipping 396 matching lines @@
   Label left_not_string, call_runtime;
 
   Register left = a1;
   Register right = a0;
 
   // Check if left argument is a string.
   __ JumpIfSmi(left, &left_not_string);
   __ GetObjectType(left, a2, a2);
   __ Branch(&left_not_string, ge, a2, Operand(FIRST_NONSTRING_TYPE));
 
-  StringAddStub string_add_left_stub((StringAddFlags)
-      (ERECT_FRAME | NO_STRING_CHECK_LEFT_IN_STUB));
+  StringAddStub string_add_left_stub(
+      (StringAddFlags)(STRING_ADD_CHECK_RIGHT | STRING_ADD_ERECT_FRAME));
   GenerateRegisterArgsPush(masm);
   __ TailCallStub(&string_add_left_stub);
 
   // Left operand is not a string, test right.
   __ bind(&left_not_string);
   __ JumpIfSmi(right, &call_runtime);
   __ GetObjectType(right, a2, a2);
   __ Branch(&call_runtime, ge, a2, Operand(FIRST_NONSTRING_TYPE));
 
-  StringAddStub string_add_right_stub((StringAddFlags)
-      (ERECT_FRAME | NO_STRING_CHECK_RIGHT_IN_STUB));
+  StringAddStub string_add_right_stub(
+      (StringAddFlags)(STRING_ADD_CHECK_LEFT | STRING_ADD_ERECT_FRAME));
   GenerateRegisterArgsPush(masm);
   __ TailCallStub(&string_add_right_stub);
 
   // At least one argument is not a string.
   __ bind(&call_runtime);
 }
 
 
 void BinaryOpStub_GenerateHeapResultAllocation(MacroAssembler* masm,
                                                Register result,
@@ skipping 3281 matching lines @@
 
   // Stack on entry:
   // sp[0]: second argument (right).
   // sp[4]: first argument (left).
 
   // Load the two arguments.
   __ lw(a0, MemOperand(sp, 1 * kPointerSize));  // First argument.
   __ lw(a1, MemOperand(sp, 0 * kPointerSize));  // Second argument.
 
   // Make sure that both arguments are strings if not known in advance.
-  if ((flags_ & NO_STRING_ADD_FLAGS) != 0) {
+  // Otherwise, at least one of the arguments is definitely a string,
+  // and we convert the one that is not known to be a string.
+  if ((flags_ & STRING_ADD_CHECK_BOTH) == STRING_ADD_CHECK_BOTH) {
     __ JumpIfEitherSmi(a0, a1, &call_runtime);
     // Load instance types.
     __ lw(t0, FieldMemOperand(a0, HeapObject::kMapOffset));
     __ lw(t1, FieldMemOperand(a1, HeapObject::kMapOffset));
     __ lbu(t0, FieldMemOperand(t0, Map::kInstanceTypeOffset));
     __ lbu(t1, FieldMemOperand(t1, Map::kInstanceTypeOffset));
     STATIC_ASSERT(kStringTag == 0);
     // If either is not a string, go to runtime.
     __ Or(t4, t0, Operand(t1));
     __ And(t4, t4, Operand(kIsNotStringMask));
     __ Branch(&call_runtime, ne, t4, Operand(zero_reg));
-  } else {
-    // Here at least one of the arguments is definitely a string.
-    // We convert the one that is not known to be a string.
-    if ((flags_ & NO_STRING_CHECK_LEFT_IN_STUB) == 0) {
-      ASSERT((flags_ & NO_STRING_CHECK_RIGHT_IN_STUB) != 0);
-      GenerateConvertArgument(
-          masm, 1 * kPointerSize, a0, a2, a3, t0, t1, &call_builtin);
-      builtin_id = Builtins::STRING_ADD_RIGHT;
-    } else if ((flags_ & NO_STRING_CHECK_RIGHT_IN_STUB) == 0) {
-      ASSERT((flags_ & NO_STRING_CHECK_LEFT_IN_STUB) != 0);
-      GenerateConvertArgument(
-          masm, 0 * kPointerSize, a1, a2, a3, t0, t1, &call_builtin);
-      builtin_id = Builtins::STRING_ADD_LEFT;
-    }
+  } else if ((flags_ & STRING_ADD_CHECK_LEFT) == STRING_ADD_CHECK_LEFT) {
+    ASSERT((flags_ & STRING_ADD_CHECK_RIGHT) == 0);
+    GenerateConvertArgument(
+        masm, 1 * kPointerSize, a0, a2, a3, t0, t1, &call_builtin);
+    builtin_id = Builtins::STRING_ADD_RIGHT;
+  } else if ((flags_ & STRING_ADD_CHECK_RIGHT) == STRING_ADD_CHECK_RIGHT) {
+    ASSERT((flags_ & STRING_ADD_CHECK_LEFT) == 0);
+    GenerateConvertArgument(
+        masm, 0 * kPointerSize, a1, a2, a3, t0, t1, &call_builtin);
+    builtin_id = Builtins::STRING_ADD_LEFT;
   }
 
   // Both arguments are strings.
   // a0: first string
   // a1: second string
   // t0: first string instance type (if flags_ == NO_STRING_ADD_FLAGS)
   // t1: second string instance type (if flags_ == NO_STRING_ADD_FLAGS)
   {
     Label strings_not_empty;
     // Check if either of the strings are empty. In that case return the other.
@@ skipping 30 matching lines @@
   // Look at the length of the result of adding the two strings.
   Label string_add_flat_result, longer_than_two;
   // Adding two lengths can't overflow.
   STATIC_ASSERT(String::kMaxLength < String::kMaxLength * 2);
   __ Addu(t2, a2, Operand(a3));
   // Use the string table when adding two one character strings, as it
   // helps later optimizations to return a string here.
   __ Branch(&longer_than_two, ne, t2, Operand(2));
 
   // Check that both strings are non-external ASCII strings.
-  if (flags_ != NO_STRING_ADD_FLAGS) {
+  if ((flags_ & STRING_ADD_CHECK_BOTH) != STRING_ADD_CHECK_BOTH) {
     __ lw(t0, FieldMemOperand(a0, HeapObject::kMapOffset));
     __ lw(t1, FieldMemOperand(a1, HeapObject::kMapOffset));
     __ lbu(t0, FieldMemOperand(t0, Map::kInstanceTypeOffset));
     __ lbu(t1, FieldMemOperand(t1, Map::kInstanceTypeOffset));
   }
   __ JumpIfBothInstanceTypesAreNotSequentialAscii(t0, t1, t2, t3,
                                                  &call_runtime);
 
   // Get the two characters forming the sub string.
   __ lbu(a2, FieldMemOperand(a0, SeqOneByteString::kHeaderSize));
@@ skipping 23 matching lines @@
   // Check if resulting string will be flat.
   __ Branch(&string_add_flat_result, lt, t2, Operand(ConsString::kMinLength));
   // Handle exceptionally long strings in the runtime system.
   STATIC_ASSERT((String::kMaxLength & 0x80000000) == 0);
   ASSERT(IsPowerOf2(String::kMaxLength + 1));
   // kMaxLength + 1 is representable as shifted literal, kMaxLength is not.
   __ Branch(&call_runtime, hs, t2, Operand(String::kMaxLength + 1));
 
   // If result is not supposed to be flat, allocate a cons string object.
   // If both strings are ASCII the result is an ASCII cons string.
-  if (flags_ != NO_STRING_ADD_FLAGS) {
+  if ((flags_ & STRING_ADD_CHECK_BOTH) != STRING_ADD_CHECK_BOTH) {
     __ lw(t0, FieldMemOperand(a0, HeapObject::kMapOffset));
     __ lw(t1, FieldMemOperand(a1, HeapObject::kMapOffset));
     __ lbu(t0, FieldMemOperand(t0, Map::kInstanceTypeOffset));
     __ lbu(t1, FieldMemOperand(t1, Map::kInstanceTypeOffset));
   }
   Label non_ascii, allocated, ascii_data;
   STATIC_ASSERT(kTwoByteStringTag == 0);
   // Branch to non_ascii if either string-encoding field is zero (non-ASCII).
   __ And(t4, t0, Operand(t1));
   __ And(t4, t4, Operand(kStringEncodingMask));
@@ skipping 62 matching lines @@
   // Locate the first characters' locations.
   // a0: first string
   // a1: second string
   // a2: length of first string
   // a3: length of second string
   // t0: first string instance type (if flags_ == NO_STRING_ADD_FLAGS)
   // t1: second string instance type (if flags_ == NO_STRING_ADD_FLAGS)
   // t2: sum of lengths.
   Label first_prepared, second_prepared;
   __ bind(&string_add_flat_result);
-  if (flags_ != NO_STRING_ADD_FLAGS) {
+  if ((flags_ & STRING_ADD_CHECK_BOTH) != STRING_ADD_CHECK_BOTH) {
     __ lw(t0, FieldMemOperand(a0, HeapObject::kMapOffset));
     __ lw(t1, FieldMemOperand(a1, HeapObject::kMapOffset));
     __ lbu(t0, FieldMemOperand(t0, Map::kInstanceTypeOffset));
     __ lbu(t1, FieldMemOperand(t1, Map::kInstanceTypeOffset));
   }
   // Check whether both strings have same encoding
   __ Xor(t3, t0, Operand(t1));
   __ And(t3, t3, Operand(kStringEncodingMask));
   __ Branch(&call_runtime, ne, t3, Operand(zero_reg));
 
@@ skipping 65 matching lines @@
   // t2: first character of result.
   StringHelper::GenerateCopyCharacters(masm, t2, t3, a2, t0, false);
   // t2: next character of result.
   StringHelper::GenerateCopyCharacters(masm, t2, a1, a3, t0, false);
 
   __ IncrementCounter(counters->string_add_native(), 1, a2, a3);
   __ DropAndRet(2);
 
   // Just jump to runtime to add the two strings.
   __ bind(&call_runtime);
-  if ((flags_ & ERECT_FRAME) != 0) {
+  if ((flags_ & STRING_ADD_ERECT_FRAME) != 0) {
     GenerateRegisterArgsPop(masm);
     // Build a frame.
     {
       FrameScope scope(masm, StackFrame::INTERNAL);
       GenerateRegisterArgsPush(masm);
       __ CallRuntime(Runtime::kStringAdd, 2);
     }
     __ Ret();
   } else {
     __ TailCallRuntime(Runtime::kStringAdd, 2, 1);
   }
 
   if (call_builtin.is_linked()) {
     __ bind(&call_builtin);
-    if ((flags_ & ERECT_FRAME) != 0) {
+    if ((flags_ & STRING_ADD_ERECT_FRAME) != 0) {
       GenerateRegisterArgsPop(masm);
       // Build a frame.
       {
         FrameScope scope(masm, StackFrame::INTERNAL);
         GenerateRegisterArgsPush(masm);
         __ InvokeBuiltin(builtin_id, CALL_FUNCTION);
       }
       __ Ret();
     } else {
       __ InvokeBuiltin(builtin_id, JUMP_FUNCTION);
@@ skipping 1431 matching lines @@
   __ bind(&fast_elements_case);
   GenerateCase(masm, FAST_ELEMENTS);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_MIPS