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//===-- llvm/MC/MCInstrInfo.h - Target Instruction Info ---------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file describes the target machine instruction set.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_MC_MCINSTRINFO_H
#define LLVM_MC_MCINSTRINFO_H
#include "llvm/ADT/StringRef.h"
#include "llvm/MC/MCInstrDesc.h"
#include <cassert>
namespace llvm {
class MCSubtargetInfo;
//---------------------------------------------------------------------------
/// Interface to description of machine instruction set.
class MCInstrInfo {
public:
using ComplexDeprecationPredicate = bool (*)(MCInst &,
const MCSubtargetInfo &,
std::string &);
private:
const MCInstrDesc *LastDesc; // Raw array to allow static init'n
const unsigned *InstrNameIndices; // Array for name indices in InstrNameData
const char *InstrNameData; // Instruction name string pool
// Subtarget feature that an instruction is deprecated on, if any
// -1 implies this is not deprecated by any single feature. It may still be
// deprecated due to a "complex" reason, below.
const uint8_t *DeprecatedFeatures;
// A complex method to determine if a certain instruction is deprecated or
// not, and return the reason for deprecation.
const ComplexDeprecationPredicate *ComplexDeprecationInfos;
unsigned NumOpcodes; // Number of entries in the desc array
public:
/// Initialize MCInstrInfo, called by TableGen auto-generated routines.
/// *DO NOT USE*.
void InitMCInstrInfo(const MCInstrDesc *D, const unsigned *NI, const char *ND,
const uint8_t *DF,
const ComplexDeprecationPredicate *CDI, unsigned NO) {
LastDesc = D + NO - 1;
InstrNameIndices = NI;
InstrNameData = ND;
DeprecatedFeatures = DF;
ComplexDeprecationInfos = CDI;
NumOpcodes = NO;
}
unsigned getNumOpcodes() const { return NumOpcodes; }
/// Return the machine instruction descriptor that corresponds to the
/// specified instruction opcode.
const MCInstrDesc &get(unsigned Opcode) const {
assert(Opcode < NumOpcodes && "Invalid opcode!");
// The table is indexed backwards from the last entry.
return *(LastDesc - Opcode);
}
/// Returns the name for the instructions with the given opcode.
StringRef getName(unsigned Opcode) const {
assert(Opcode < NumOpcodes && "Invalid opcode!");
return StringRef(&InstrNameData[InstrNameIndices[Opcode]]);
}
/// Returns true if a certain instruction is deprecated and if so
/// returns the reason in \p Info.
bool getDeprecatedInfo(MCInst &MI, const MCSubtargetInfo &STI,
std::string &Info) const;
};
} // End llvm namespace
#endif
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