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// Copyright 2022 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.
#include "src/maglev/maglev-assembler-inl.h"
#include "src/maglev/maglev-code-generator.h"
namespace v8 {
namespace internal {
namespace maglev {
Register MaglevAssembler::FromAnyToRegister(const Input& input,
Register scratch) {
if (input.operand().IsConstant()) {
input.node()->LoadToRegister(this, scratch);
return scratch;
}
const compiler::AllocatedOperand& operand =
compiler::AllocatedOperand::cast(input.operand());
if (operand.IsRegister()) {
return ToRegister(input);
} else {
DCHECK(operand.IsStackSlot());
Move(scratch, ToMemOperand(input));
return scratch;
}
}
void MaglevAssembler::LoadSingleCharacterString(Register result,
int char_code) {
DCHECK_GE(char_code, 0);
DCHECK_LT(char_code, String::kMaxOneByteCharCode);
Register table = result;
LoadRoot(table, RootIndex::kSingleCharacterStringTable);
DecompressTagged(result, FieldMemOperand(table, FixedArray::kHeaderSize +
char_code * kTaggedSize));
}
void MaglevAssembler::LoadDataField(const PolymorphicAccessInfo& access_info,
Register result, Register object,
Register scratch) {
Register load_source = object;
// Resolve property holder.
if (access_info.holder().has_value()) {
load_source = scratch;
Move(load_source, access_info.holder().value().object());
}
FieldIndex field_index = access_info.field_index();
if (!field_index.is_inobject()) {
Register load_source_object = load_source;
if (load_source == object) {
load_source = scratch;
}
// The field is in the property array, first load it from there.
AssertNotSmi(load_source_object);
DecompressTagged(load_source,
FieldMemOperand(load_source_object,
JSReceiver::kPropertiesOrHashOffset));
}
AssertNotSmi(load_source);
DecompressTagged(result, FieldMemOperand(load_source, field_index.offset()));
}
} // namespace maglev
} // namespace internal
} // namespace v8
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