macro-assembler-shared-ia32-x64.h | Explore in Territory

// Copyright 2021 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_CODEGEN_SHARED_IA32_X64_MACRO_ASSEMBLER_SHARED_IA32_X64_H_
#define V8_CODEGEN_SHARED_IA32_X64_MACRO_ASSEMBLER_SHARED_IA32_X64_H_

#include <optional>

#include "src/base/macros.h"
#include "src/codegen/cpu-features.h"
#include "src/codegen/external-reference.h"
#include "src/codegen/macro-assembler-base.h"

#if V8_TARGET_ARCH_IA32
#include "src/codegen/ia32/register-ia32.h"
#elif V8_TARGET_ARCH_X64
#include "src/codegen/x64/register-x64.h"
#else
#error Unsupported target architecture.
#endif

namespace v8 {
namespace internal {
class Assembler;

// For WebAssembly we care about the full floating point register. If we are not
// running Wasm, we can get away with saving half of those registers.
#if V8_ENABLE_WEBASSEMBLY
constexpr int kStackSavedSavedFPSize = …;
#else
constexpr int kStackSavedSavedFPSize = kDoubleSize;
#endif  // V8_ENABLE_WEBASSEMBLY

// Base class for SharedMacroAssembler. This class contains macro-assembler
// functions that can be shared across ia32 and x64 without any template
// machinery, i.e. does not require the CRTP pattern that
// SharedMacroAssembler exposes. This allows us to keep the bulk of
// definition inside a separate source file, rather than putting everything
// inside this header.
class V8_EXPORT_PRIVATE SharedMacroAssemblerBase : public MacroAssemblerBase { … };

// Common base class template shared by ia32 and x64 MacroAssembler. This uses
// the Curiously Recurring Template Pattern (CRTP), where Impl is the actual
// class (subclass of SharedMacroAssembler instantiated with the actual
// class). This allows static polymorphism, where member functions can be move
// into SharedMacroAssemblerBase, and we can also call into member functions
// defined in ia32 or x64 specific MacroAssembler from within this template
// class, via Impl.
//
// Note: all member functions must be defined in this header file so that the
// compiler can generate code for the function definitions. See
// https://isocpp.org/wiki/faq/templates#templates-defn-vs-decl for rationale.
// If a function does not need polymorphism, move it into
// SharedMacroAssemblerBase, and define it outside of this header.
template <typename Impl>
class V8_EXPORT_PRIVATE SharedMacroAssembler : public SharedMacroAssemblerBase { … };

}  // namespace internal
}  // namespace v8
#endif  // V8_CODEGEN_SHARED_IA32_X64_MACRO_ASSEMBLER_SHARED_IA32_X64_H_
chromium/v8/src/codegen/shared-ia32-x64/macro-assembler-shared-ia32-x64.h
