整理初版

third_party/asmjit/core/assembler.h

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+// This file is part of AsmJit project <https://asmjit.com>
+//
+// See asmjit.h or LICENSE.md for license and copyright information
+// SPDX-License-Identifier: Zlib
+
+#ifndef ASMJIT_CORE_ASSEMBLER_H_INCLUDED
+#define ASMJIT_CORE_ASSEMBLER_H_INCLUDED
+
+#include "../core/codeholder.h"
+#include "../core/emitter.h"
+#include "../core/operand.h"
+
+ASMJIT_BEGIN_NAMESPACE
+
+//! \addtogroup asmjit_assembler
+//! \{
+
+//! Base assembler.
+//!
+//! This is a base class that provides interface used by architecture specific
+//! assembler implementations. Assembler doesn't hold any data, instead it's
+//! attached to \ref CodeHolder, which provides all the data that Assembler
+//! needs and which can be altered by it.
+//!
+//! Check out architecture specific assemblers for more details and examples:
+//!
+//!   - \ref x86::Assembler - X86/X64 assembler implementation.
+class ASMJIT_VIRTAPI BaseAssembler : public BaseEmitter {
+public:
+  ASMJIT_NONCOPYABLE(BaseAssembler)
+  typedef BaseEmitter Base;
+
+  //! Current section where the assembling happens.
+  Section* _section = nullptr;
+  //! Start of the CodeBuffer of the current section.
+  uint8_t* _bufferData = nullptr;
+  //! End (first invalid byte) of the current section.
+  uint8_t* _bufferEnd = nullptr;
+  //! Pointer in the CodeBuffer of the current section.
+  uint8_t* _bufferPtr = nullptr;
+
+  //! \name Construction & Destruction
+  //! \{
+
+  //! Creates a new `BaseAssembler` instance.
+  ASMJIT_API BaseAssembler() noexcept;
+  //! Destroys the `BaseAssembler` instance.
+  ASMJIT_API virtual ~BaseAssembler() noexcept;
+
+  //! \}
+
+  //! \name Code-Buffer Management
+  //! \{
+
+  //! Returns the capacity of the current CodeBuffer.
+  inline size_t bufferCapacity() const noexcept { return (size_t)(_bufferEnd - _bufferData); }
+  //! Returns the number of remaining bytes in the current CodeBuffer.
+  inline size_t remainingSpace() const noexcept { return (size_t)(_bufferEnd - _bufferPtr); }
+
+  //! Returns the current position in the CodeBuffer.
+  inline size_t offset() const noexcept { return (size_t)(_bufferPtr - _bufferData); }
+
+  //! Sets the current position in the CodeBuffer to `offset`.
+  //!
+  //! \note The `offset` cannot be greater than buffer size even if it's
+  //! within the buffer's capacity.
+  ASMJIT_API Error setOffset(size_t offset);
+
+  //! Returns the start of the CodeBuffer in the current section.
+  inline uint8_t* bufferData() const noexcept { return _bufferData; }
+  //! Returns the end (first invalid byte) in the current section.
+  inline uint8_t* bufferEnd() const noexcept { return _bufferEnd; }
+  //! Returns the current pointer in the CodeBuffer in the current section.
+  inline uint8_t* bufferPtr() const noexcept { return _bufferPtr; }
+
+  //! \}
+
+  //! \name Section Management
+  //! \{
+
+  //! Returns the current section.
+  inline Section* currentSection() const noexcept { return _section; }
+
+  ASMJIT_API Error section(Section* section) override;
+
+  //! \}
+
+  //! \name Label Management
+  //! \{
+
+  ASMJIT_API Label newLabel() override;
+  ASMJIT_API Label newNamedLabel(const char* name, size_t nameSize = SIZE_MAX, LabelType type = LabelType::kGlobal, uint32_t parentId = Globals::kInvalidId) override;
+  ASMJIT_API Error bind(const Label& label) override;
+
+  //! \}
+
+  //! \name Embed
+  //! \{
+
+  ASMJIT_API Error embed(const void* data, size_t dataSize) override;
+  ASMJIT_API Error embedDataArray(TypeId typeId, const void* data, size_t itemCount, size_t repeatCount = 1) override;
+  ASMJIT_API Error embedConstPool(const Label& label, const ConstPool& pool) override;
+
+  ASMJIT_API Error embedLabel(const Label& label, size_t dataSize = 0) override;
+  ASMJIT_API Error embedLabelDelta(const Label& label, const Label& base, size_t dataSize = 0) override;
+
+  //! \}
+
+  //! \name Comment
+  //! \{
+
+  ASMJIT_API Error comment(const char* data, size_t size = SIZE_MAX) override;
+
+  //! \}
+
+  //! \name Events
+  //! \{
+
+  ASMJIT_API Error onAttach(CodeHolder* code) noexcept override;
+  ASMJIT_API Error onDetach(CodeHolder* code) noexcept override;
+
+  //! \}
+};
+
+//! \}
+
+ASMJIT_END_NAMESPACE
+
+#endif // ASMJIT_CORE_ASSEMBLER_H_INCLUDED