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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
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