forked from OSchip/llvm-project
214 lines
6.3 KiB
C++
214 lines
6.3 KiB
C++
//===- Disassembler.cpp - Disassembler for hex strings --------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This class implements the disassembler of strings of bytes written in
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// hexadecimal, from standard input or from a file.
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//
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//===----------------------------------------------------------------------===//
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#include "Disassembler.h"
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#include "llvm/ADT/Triple.h"
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#include "llvm/MC/MCAsmInfo.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCDisassembler.h"
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#include "llvm/MC/MCInst.h"
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#include "llvm/MC/MCRegisterInfo.h"
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#include "llvm/MC/MCStreamer.h"
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#include "llvm/MC/MCSubtargetInfo.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/Support/SourceMgr.h"
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#include "llvm/Support/TargetRegistry.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace llvm;
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typedef std::pair<std::vector<unsigned char>, std::vector<const char *>>
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ByteArrayTy;
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static bool PrintInsts(const MCDisassembler &DisAsm,
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const ByteArrayTy &Bytes,
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SourceMgr &SM, raw_ostream &Out,
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MCStreamer &Streamer, bool InAtomicBlock,
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const MCSubtargetInfo &STI) {
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// Wrap the vector in a MemoryObject.
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ArrayRef<uint8_t> Data(Bytes.first.data(), Bytes.first.size());
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// Disassemble it to strings.
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uint64_t Size;
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uint64_t Index;
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for (Index = 0; Index < Bytes.first.size(); Index += Size) {
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MCInst Inst;
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MCDisassembler::DecodeStatus S;
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S = DisAsm.getInstruction(Inst, Size, Data.slice(Index), Index,
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/*REMOVE*/ nulls(), nulls());
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switch (S) {
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case MCDisassembler::Fail:
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SM.PrintMessage(SMLoc::getFromPointer(Bytes.second[Index]),
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SourceMgr::DK_Warning,
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"invalid instruction encoding");
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// Don't try to resynchronise the stream in a block
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if (InAtomicBlock)
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return true;
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if (Size == 0)
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Size = 1; // skip illegible bytes
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break;
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case MCDisassembler::SoftFail:
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SM.PrintMessage(SMLoc::getFromPointer(Bytes.second[Index]),
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SourceMgr::DK_Warning,
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"potentially undefined instruction encoding");
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// Fall through
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case MCDisassembler::Success:
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Streamer.EmitInstruction(Inst, STI);
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break;
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}
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}
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return false;
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}
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static bool SkipToToken(StringRef &Str) {
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for (;;) {
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if (Str.empty())
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return false;
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// Strip horizontal whitespace and commas.
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if (size_t Pos = Str.find_first_not_of(" \t\r\n,")) {
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Str = Str.substr(Pos);
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continue;
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}
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// If this is the start of a comment, remove the rest of the line.
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if (Str[0] == '#') {
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Str = Str.substr(Str.find_first_of('\n'));
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continue;
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}
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return true;
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}
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}
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static bool ByteArrayFromString(ByteArrayTy &ByteArray,
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StringRef &Str,
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SourceMgr &SM) {
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while (SkipToToken(Str)) {
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// Handled by higher level
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if (Str[0] == '[' || Str[0] == ']')
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return false;
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// Get the current token.
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size_t Next = Str.find_first_of(" \t\n\r,#[]");
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StringRef Value = Str.substr(0, Next);
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// Convert to a byte and add to the byte vector.
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unsigned ByteVal;
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if (Value.getAsInteger(0, ByteVal) || ByteVal > 255) {
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// If we have an error, print it and skip to the end of line.
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SM.PrintMessage(SMLoc::getFromPointer(Value.data()), SourceMgr::DK_Error,
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"invalid input token");
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Str = Str.substr(Str.find('\n'));
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ByteArray.first.clear();
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ByteArray.second.clear();
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continue;
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}
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ByteArray.first.push_back(ByteVal);
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ByteArray.second.push_back(Value.data());
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Str = Str.substr(Next);
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}
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return false;
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}
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int Disassembler::disassemble(const Target &T,
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const std::string &Triple,
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MCSubtargetInfo &STI,
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MCStreamer &Streamer,
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MemoryBuffer &Buffer,
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SourceMgr &SM,
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raw_ostream &Out) {
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std::unique_ptr<const MCRegisterInfo> MRI(T.createMCRegInfo(Triple));
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if (!MRI) {
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errs() << "error: no register info for target " << Triple << "\n";
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return -1;
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}
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std::unique_ptr<const MCAsmInfo> MAI(T.createMCAsmInfo(*MRI, Triple));
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if (!MAI) {
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errs() << "error: no assembly info for target " << Triple << "\n";
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return -1;
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}
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// Set up the MCContext for creating symbols and MCExpr's.
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MCContext Ctx(MAI.get(), MRI.get(), nullptr);
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std::unique_ptr<const MCDisassembler> DisAsm(
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T.createMCDisassembler(STI, Ctx));
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if (!DisAsm) {
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errs() << "error: no disassembler for target " << Triple << "\n";
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return -1;
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}
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// Set up initial section manually here
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Streamer.InitSections(false);
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bool ErrorOccurred = false;
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// Convert the input to a vector for disassembly.
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ByteArrayTy ByteArray;
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StringRef Str = Buffer.getBuffer();
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bool InAtomicBlock = false;
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while (SkipToToken(Str)) {
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ByteArray.first.clear();
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ByteArray.second.clear();
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if (Str[0] == '[') {
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if (InAtomicBlock) {
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SM.PrintMessage(SMLoc::getFromPointer(Str.data()), SourceMgr::DK_Error,
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"nested atomic blocks make no sense");
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ErrorOccurred = true;
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}
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InAtomicBlock = true;
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Str = Str.drop_front();
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continue;
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} else if (Str[0] == ']') {
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if (!InAtomicBlock) {
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SM.PrintMessage(SMLoc::getFromPointer(Str.data()), SourceMgr::DK_Error,
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"attempt to close atomic block without opening");
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ErrorOccurred = true;
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}
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InAtomicBlock = false;
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Str = Str.drop_front();
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continue;
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}
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// It's a real token, get the bytes and emit them
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ErrorOccurred |= ByteArrayFromString(ByteArray, Str, SM);
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if (!ByteArray.first.empty())
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ErrorOccurred |= PrintInsts(*DisAsm, ByteArray, SM, Out, Streamer,
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InAtomicBlock, STI);
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}
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if (InAtomicBlock) {
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SM.PrintMessage(SMLoc::getFromPointer(Str.data()), SourceMgr::DK_Error,
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"unclosed atomic block");
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ErrorOccurred = true;
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}
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return ErrorOccurred;
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}
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