[stubs] Port LoadIndexedStringStub to CSA

src/arm64/code-stubs-arm64.cc

 // Copyright 2013 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.
 
 #if V8_TARGET_ARCH_ARM64
 
 #include "src/code-stubs.h"
 #include "src/api-arguments.h"
 #include "src/bootstrapper.h"
 #include "src/codegen.h"
@@ skipping 1267 matching lines @@
                      LoadWithVectorDescriptor::SlotRegister()));
 
   NamedLoadHandlerCompiler::GenerateLoadFunctionPrototype(masm, receiver, x10,
                                                           x11, &miss);
 
   __ Bind(&miss);
   PropertyAccessCompiler::TailCallBuiltin(
       masm, PropertyAccessCompiler::MissBuiltin(Code::LOAD_IC));
 }
 
-
-void LoadIndexedStringStub::Generate(MacroAssembler* masm) {
-  // Return address is in lr.
-  Label miss;
-
-  Register receiver = LoadDescriptor::ReceiverRegister();
-  Register index = LoadDescriptor::NameRegister();
-  Register result = x0;
-  Register scratch = x10;
-  DCHECK(!scratch.is(receiver) && !scratch.is(index));
-  DCHECK(!scratch.is(LoadWithVectorDescriptor::VectorRegister()) &&
-         result.is(LoadWithVectorDescriptor::SlotRegister()));
-
-  // StringCharAtGenerator doesn't use the result register until it's passed
-  // the different miss possibilities. If it did, we would have a conflict
-  // when FLAG_vector_ics is true.
-  StringCharAtGenerator char_at_generator(receiver, index, scratch, result,
-                                          &miss,  // When not a string.
-                                          &miss,  // When not a number.
-                                          &miss,  // When index out of range.
-                                          RECEIVER_IS_STRING);
-  char_at_generator.GenerateFast(masm);
-  __ Ret();
-
-  StubRuntimeCallHelper call_helper;
-  char_at_generator.GenerateSlow(masm, PART_OF_IC_HANDLER, call_helper);
-
-  __ Bind(&miss);
-  PropertyAccessCompiler::TailCallBuiltin(
-      masm, PropertyAccessCompiler::MissBuiltin(Code::KEYED_LOAD_IC));
-}
-
-
 void RegExpExecStub::Generate(MacroAssembler* masm) {
 #ifdef V8_INTERPRETED_REGEXP
   __ TailCallRuntime(Runtime::kRegExpExec);
 #else  // V8_INTERPRETED_REGEXP
 
   // Stack frame on entry.
   //  jssp[0]: last_match_info (expected JSArray)
   //  jssp[8]: previous index
   //  jssp[16]: subject string
   //  jssp[24]: JSRegExp object
@@ skipping 718 matching lines @@
   __ SmiTag(index_);
   __ Push(object_, index_);
   __ CallRuntime(Runtime::kStringCharCodeAtRT);
   __ Mov(result_, x0);
   call_helper.AfterCall(masm);
   __ B(&exit_);
 
   __ Abort(kUnexpectedFallthroughFromCharCodeAtSlowCase);
 }
 
-
-void StringCharFromCodeGenerator::GenerateFast(MacroAssembler* masm) {
-  __ JumpIfNotSmi(code_, &slow_case_);
-  __ Cmp(code_, Smi::FromInt(String::kMaxOneByteCharCode));
-  __ B(hi, &slow_case_);
-
-  __ LoadRoot(result_, Heap::kSingleCharacterStringCacheRootIndex);
-  // At this point code register contains smi tagged one-byte char code.
-  __ Add(result_, result_, Operand::UntagSmiAndScale(code_, kPointerSizeLog2));
-  __ Ldr(result_, FieldMemOperand(result_, FixedArray::kHeaderSize));
-  __ JumpIfRoot(result_, Heap::kUndefinedValueRootIndex, &slow_case_);
-  __ Bind(&exit_);
-}
-
-
-void StringCharFromCodeGenerator::GenerateSlow(
-    MacroAssembler* masm,
-    const RuntimeCallHelper& call_helper) {
-  __ Abort(kUnexpectedFallthroughToCharFromCodeSlowCase);
-
-  __ Bind(&slow_case_);
-  call_helper.BeforeCall(masm);
-  __ Push(code_);
-  __ CallRuntime(Runtime::kStringCharFromCode);
-  __ Mov(result_, x0);
-  call_helper.AfterCall(masm);
-  __ B(&exit_);
-
-  __ Abort(kUnexpectedFallthroughFromCharFromCodeSlowCase);
-}
-
-
 void CompareICStub::GenerateBooleans(MacroAssembler* masm) {
   // Inputs are in x0 (lhs) and x1 (rhs).
   DCHECK_EQ(CompareICState::BOOLEAN, state());
   ASM_LOCATION("CompareICStub[Booleans]");
   Label miss;
 
   __ CheckMap(x1, x2, Heap::kBooleanMapRootIndex, &miss, DO_SMI_CHECK);
   __ CheckMap(x0, x3, Heap::kBooleanMapRootIndex, &miss, DO_SMI_CHECK);
   if (!Token::IsEqualityOp(op())) {
     __ Ldr(x1, FieldMemOperand(x1, Oddball::kToNumberOffset));
@@ skipping 1590 matching lines @@
                            kStackUnwindSpace, NULL, spill_offset,
                            return_value_operand, NULL);
 }
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_ARM64