SystemZDisassembler.cpp | Explore in Territory

//===-- SystemZDisassembler.cpp - Disassembler for SystemZ ------*- 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
//
//===----------------------------------------------------------------------===//

#include "MCTargetDesc/SystemZMCTargetDesc.h"
#include "SystemZ.h"
#include "TargetInfo/SystemZTargetInfo.h"
#include "llvm/MC/MCDecoderOps.h"
#include "llvm/MC/MCDisassembler/MCDisassembler.h"
#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCSubtargetInfo.h"
#include "llvm/MC/TargetRegistry.h"
#include "llvm/Support/MathExtras.h"
#include <cassert>
#include <cstdint>

usingnamespacellvm;

#define DEBUG_TYPE …

DecodeStatus;

namespace {

class SystemZDisassembler : public MCDisassembler { … };

} // end anonymous namespace

static MCDisassembler *createSystemZDisassembler(const Target &T,
                                                 const MCSubtargetInfo &STI,
                                                 MCContext &Ctx) { … }

// NOLINTNEXTLINE(readability-identifier-naming)
extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeSystemZDisassembler() { … }

/// tryAddingSymbolicOperand - trys to add a symbolic operand in place of the
/// immediate Value in the MCInst.
///
/// @param Value      - The immediate Value, has had any PC adjustment made by
///                     the caller.
/// @param isBranch   - If the instruction is a branch instruction
/// @param Address    - The starting address of the instruction
/// @param Offset     - The byte offset to this immediate in the instruction
/// @param Width      - The byte width of this immediate in the instruction
///
/// If the getOpInfo() function was set when setupForSymbolicDisassembly() was
/// called then that function is called to get any symbolic information for the
/// immediate in the instruction using the Address, Offset and Width.  If that
/// returns non-zero then the symbolic information it returns is used to create
/// an MCExpr and that is added as an operand to the MCInst.  If getOpInfo()
/// returns zero and isBranch is true then a symbol look up for immediate Value
/// is done and if a symbol is found an MCExpr is created with that, else
/// an MCExpr with the immediate Value is created.  This function returns true
/// if it adds an operand to the MCInst and false otherwise.
static bool tryAddingSymbolicOperand(int64_t Value, bool IsBranch,
                                     uint64_t Address, uint64_t Offset,
                                     uint64_t Width, MCInst &MI,
                                     const MCDisassembler *Decoder) { … }

static DecodeStatus decodeRegisterClass(MCInst &Inst, uint64_t RegNo,
                                        const unsigned *Regs, unsigned Size,
                                        bool IsAddr = false) { … }

static DecodeStatus DecodeGR32BitRegisterClass(MCInst &Inst, uint64_t RegNo,
                                               uint64_t Address,
                                               const MCDisassembler *Decoder) { … }

static DecodeStatus DecodeGRH32BitRegisterClass(MCInst &Inst, uint64_t RegNo,
                                                uint64_t Address,
                                                const MCDisassembler *Decoder) { … }

static DecodeStatus DecodeGR64BitRegisterClass(MCInst &Inst, uint64_t RegNo,
                                               uint64_t Address,
                                               const MCDisassembler *Decoder) { … }

static DecodeStatus DecodeGR128BitRegisterClass(MCInst &Inst, uint64_t RegNo,
                                                uint64_t Address,
                                                const MCDisassembler *Decoder) { … }

static DecodeStatus
DecodeADDR32BitRegisterClass(MCInst &Inst, uint64_t RegNo, uint64_t Address,
                             const MCDisassembler *Decoder) { … }

static DecodeStatus
DecodeADDR64BitRegisterClass(MCInst &Inst, uint64_t RegNo, uint64_t Address,
                             const MCDisassembler *Decoder) { … }

static DecodeStatus DecodeFP32BitRegisterClass(MCInst &Inst, uint64_t RegNo,
                                               uint64_t Address,
                                               const MCDisassembler *Decoder) { … }

static DecodeStatus DecodeFP64BitRegisterClass(MCInst &Inst, uint64_t RegNo,
                                               uint64_t Address,
                                               const MCDisassembler *Decoder) { … }

static DecodeStatus DecodeFP128BitRegisterClass(MCInst &Inst, uint64_t RegNo,
                                                uint64_t Address,
                                                const MCDisassembler *Decoder) { … }

static DecodeStatus DecodeVR32BitRegisterClass(MCInst &Inst, uint64_t RegNo,
                                               uint64_t Address,
                                               const MCDisassembler *Decoder) { … }

static DecodeStatus DecodeVR64BitRegisterClass(MCInst &Inst, uint64_t RegNo,
                                               uint64_t Address,
                                               const MCDisassembler *Decoder) { … }

static DecodeStatus DecodeVR128BitRegisterClass(MCInst &Inst, uint64_t RegNo,
                                                uint64_t Address,
                                                const MCDisassembler *Decoder) { … }

static DecodeStatus DecodeAR32BitRegisterClass(MCInst &Inst, uint64_t RegNo,
                                               uint64_t Address,
                                               const MCDisassembler *Decoder) { … }

static DecodeStatus DecodeCR64BitRegisterClass(MCInst &Inst, uint64_t RegNo,
                                               uint64_t Address,
                                               const MCDisassembler *Decoder) { … }

template<unsigned N>
static DecodeStatus decodeUImmOperand(MCInst &Inst, uint64_t Imm) { … }

template<unsigned N>
static DecodeStatus decodeSImmOperand(MCInst &Inst, uint64_t Imm) { … }

static DecodeStatus decodeU1ImmOperand(MCInst &Inst, uint64_t Imm,
                                       uint64_t Address,
                                       const MCDisassembler *Decoder) { … }

static DecodeStatus decodeU2ImmOperand(MCInst &Inst, uint64_t Imm,
                                       uint64_t Address,
                                       const MCDisassembler *Decoder) { … }

static DecodeStatus decodeU3ImmOperand(MCInst &Inst, uint64_t Imm,
                                       uint64_t Address,
                                       const MCDisassembler *Decoder) { … }

static DecodeStatus decodeU4ImmOperand(MCInst &Inst, uint64_t Imm,
                                       uint64_t Address,
                                       const MCDisassembler *Decoder) { … }

static DecodeStatus decodeU8ImmOperand(MCInst &Inst, uint64_t Imm,
                                       uint64_t Address,
                                       const MCDisassembler *Decoder) { … }

static DecodeStatus decodeU12ImmOperand(MCInst &Inst, uint64_t Imm,
                                        uint64_t Address,
                                        const MCDisassembler *Decoder) { … }

static DecodeStatus decodeU16ImmOperand(MCInst &Inst, uint64_t Imm,
                                        uint64_t Address,
                                        const MCDisassembler *Decoder) { … }

static DecodeStatus decodeU32ImmOperand(MCInst &Inst, uint64_t Imm,
                                        uint64_t Address,
                                        const MCDisassembler *Decoder) { … }

static DecodeStatus decodeS8ImmOperand(MCInst &Inst, uint64_t Imm,
                                       uint64_t Address,
                                       const MCDisassembler *Decoder) { … }

static DecodeStatus decodeS16ImmOperand(MCInst &Inst, uint64_t Imm,
                                        uint64_t Address,
                                        const MCDisassembler *Decoder) { … }

static DecodeStatus decodeS20ImmOperand(MCInst &Inst, uint64_t Imm,
                                        uint64_t Address,
                                        const MCDisassembler *Decoder) { … }

static DecodeStatus decodeS32ImmOperand(MCInst &Inst, uint64_t Imm,
                                        uint64_t Address,
                                        const MCDisassembler *Decoder) { … }

template <unsigned N>
static DecodeStatus decodeLenOperand(MCInst &Inst, uint64_t Imm,
                                     uint64_t Address,
                                     const MCDisassembler *Decoder) { … }

template <unsigned N>
static DecodeStatus decodePCDBLOperand(MCInst &Inst, uint64_t Imm,
                                       uint64_t Address, bool isBranch,
                                       const MCDisassembler *Decoder) { … }

static DecodeStatus decodePC12DBLBranchOperand(MCInst &Inst, uint64_t Imm,
                                               uint64_t Address,
                                               const MCDisassembler *Decoder) { … }

static DecodeStatus decodePC16DBLBranchOperand(MCInst &Inst, uint64_t Imm,
                                               uint64_t Address,
                                               const MCDisassembler *Decoder) { … }

static DecodeStatus decodePC24DBLBranchOperand(MCInst &Inst, uint64_t Imm,
                                               uint64_t Address,
                                               const MCDisassembler *Decoder) { … }

static DecodeStatus decodePC32DBLBranchOperand(MCInst &Inst, uint64_t Imm,
                                               uint64_t Address,
                                               const MCDisassembler *Decoder) { … }

static DecodeStatus decodePC32DBLOperand(MCInst &Inst, uint64_t Imm,
                                         uint64_t Address,
                                         const MCDisassembler *Decoder) { … }

#include "SystemZGenDisassemblerTables.inc"

DecodeStatus SystemZDisassembler::getInstruction(MCInst &MI, uint64_t &Size,
                                                 ArrayRef<uint8_t> Bytes,
                                                 uint64_t Address,
                                                 raw_ostream &CS) const { … }
llvm/llvm/lib/Target/SystemZ/Disassembler/SystemZDisassembler.cpp
