[compiler] Introduce code stubs for string relational comparisons.

src/code-stubs.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_CODE_STUBS_H_
 #define V8_CODE_STUBS_H_
 
 #include "src/allocation.h"
 #include "src/assembler.h"
 #include "src/codegen.h"
@@ skipping 91 matching lines @@
   V(AllocateMutableHeapNumber)              \
   V(StringLength)                           \
   V(LessThan)                               \
   V(LessThanOrEqual)                        \
   V(GreaterThan)                            \
   V(GreaterThanOrEqual)                     \
   V(StrictEqual)                            \
   V(StrictNotEqual)                         \
   V(StringEqual)                            \
   V(StringNotEqual)                         \
+  V(StringLessThan)                         \
+  V(StringLessThanOrEqual)                  \
+  V(StringGreaterThan)                      \
+  V(StringGreaterThanOrEqual)               \
   V(ToBoolean)                              \
   /* IC Handler stubs */                    \
   V(ArrayBufferViewLoadField)               \
   V(LoadConstant)                           \
   V(LoadFastElement)                        \
   V(LoadField)                              \
   V(KeyedLoadSloppyArguments)               \
   V(KeyedStoreSloppyArguments)              \
   V(StoreField)                             \
   V(StoreGlobal)                            \
@@ skipping 572 matching lines @@
 };
 
 class StringNotEqualStub final : public TurboFanCodeStub {
  public:
   explicit StringNotEqualStub(Isolate* isolate) : TurboFanCodeStub(isolate) {}
 
   DEFINE_CALL_INTERFACE_DESCRIPTOR(Compare);
   DEFINE_TURBOFAN_CODE_STUB(StringNotEqual, TurboFanCodeStub);
 };
 
+class StringLessThanStub final : public TurboFanCodeStub {
+ public:
+  explicit StringLessThanStub(Isolate* isolate) : TurboFanCodeStub(isolate) {}
+
+  DEFINE_CALL_INTERFACE_DESCRIPTOR(Compare);
+  DEFINE_TURBOFAN_CODE_STUB(StringLessThan, TurboFanCodeStub);
+};
+
+class StringLessThanOrEqualStub final : public TurboFanCodeStub {
+ public:
+  explicit StringLessThanOrEqualStub(Isolate* isolate)
+      : TurboFanCodeStub(isolate) {}
+
+  DEFINE_CALL_INTERFACE_DESCRIPTOR(Compare);
+  DEFINE_TURBOFAN_CODE_STUB(StringLessThanOrEqual, TurboFanCodeStub);
+};
+
+class StringGreaterThanStub final : public TurboFanCodeStub {
+ public:
+  explicit StringGreaterThanStub(Isolate* isolate)
+      : TurboFanCodeStub(isolate) {}
+
+  DEFINE_CALL_INTERFACE_DESCRIPTOR(Compare);
+  DEFINE_TURBOFAN_CODE_STUB(StringGreaterThan, TurboFanCodeStub);
+};
+
+class StringGreaterThanOrEqualStub final : public TurboFanCodeStub {
+ public:
+  explicit StringGreaterThanOrEqualStub(Isolate* isolate)
+      : TurboFanCodeStub(isolate) {}
+
+  DEFINE_CALL_INTERFACE_DESCRIPTOR(Compare);
+  DEFINE_TURBOFAN_CODE_STUB(StringGreaterThanOrEqual, TurboFanCodeStub);
+};
+
 class ToBooleanStub final : public TurboFanCodeStub {
  public:
   explicit ToBooleanStub(Isolate* isolate) : TurboFanCodeStub(isolate) {}
 
   DEFINE_CALL_INTERFACE_DESCRIPTOR(ToBoolean);
   DEFINE_TURBOFAN_CODE_STUB(ToBoolean, TurboFanCodeStub);
 };
 
 enum StringAddFlags {
   // Omit both parameter checks.
@@ skipping 2237 matching lines @@
 #undef DEFINE_HYDROGEN_CODE_STUB
 #undef DEFINE_CODE_STUB
 #undef DEFINE_CODE_STUB_BASE
 
 extern Representation RepresentationFromType(Type* type);
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_CODE_STUBS_H_