mirror of
https://github.com/c64scene-ar/llvm-6502.git
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f23c769294
patch by Marius Wachtler! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@101160 91177308-0d34-0410-b5e6-96231b3b80d8
354 lines
9.1 KiB
C++
354 lines
9.1 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/OwningPtr.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/MCDisassembler.h"
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#include "llvm/MC/MCInst.h"
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#include "llvm/MC/MCInstPrinter.h"
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#include "llvm/Target/TargetRegistry.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/Support/MemoryObject.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/Support/SourceMgr.h"
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#include "llvm-c/EnhancedDisassembly.h"
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using namespace llvm;
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typedef std::vector<std::pair<unsigned char, const char*> > ByteArrayTy;
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namespace {
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class VectorMemoryObject : public MemoryObject {
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private:
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const ByteArrayTy &Bytes;
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public:
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VectorMemoryObject(const ByteArrayTy &bytes) : Bytes(bytes) {}
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uint64_t getBase() const { return 0; }
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uint64_t getExtent() const { return Bytes.size(); }
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int readByte(uint64_t Addr, uint8_t *Byte) const {
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if (Addr > getExtent())
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return -1;
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*Byte = Bytes[Addr].first;
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return 0;
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}
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};
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}
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static bool PrintInsts(const MCDisassembler &DisAsm,
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MCInstPrinter &Printer, const ByteArrayTy &Bytes,
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SourceMgr &SM) {
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// Wrap the vector in a MemoryObject.
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VectorMemoryObject memoryObject(Bytes);
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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.size(); Index += Size) {
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MCInst Inst;
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if (DisAsm.getInstruction(Inst, Size, memoryObject, Index,
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/*REMOVE*/ nulls())) {
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Printer.printInst(&Inst, outs());
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outs() << "\n";
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} else {
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SM.PrintMessage(SMLoc::getFromPointer(Bytes[Index].second),
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"invalid instruction encoding", "warning");
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if (Size == 0)
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Size = 1; // skip illegible bytes
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}
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}
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return false;
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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 (!Str.empty()) {
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// Strip horizontal whitespace.
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if (size_t Pos = Str.find_first_not_of(" \t\r")) {
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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 end of a line or start of a comment, remove the rest of
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// the line.
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if (Str[0] == '\n' || Str[0] == '#') {
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// Strip to the end of line if we already processed any bytes on this
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// line. This strips the comment and/or the \n.
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if (Str[0] == '\n') {
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Str = Str.substr(1);
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} else {
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Str = Str.substr(Str.find_first_of('\n'));
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if (!Str.empty())
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Str = Str.substr(1);
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}
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continue;
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}
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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()),
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"invalid input token", "error");
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Str = Str.substr(Str.find('\n'));
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ByteArray.clear();
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continue;
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}
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ByteArray.push_back(std::make_pair((unsigned char)ByteVal, 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, const std::string &Triple,
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MemoryBuffer &Buffer) {
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// Set up disassembler.
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OwningPtr<const MCAsmInfo> AsmInfo(T.createAsmInfo(Triple));
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if (!AsmInfo) {
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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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OwningPtr<const MCDisassembler> DisAsm(T.createMCDisassembler());
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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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int AsmPrinterVariant = AsmInfo->getAssemblerDialect();
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OwningPtr<MCInstPrinter> IP(T.createMCInstPrinter(AsmPrinterVariant,
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*AsmInfo));
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if (!IP) {
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errs() << "error: no instruction printer for target " << Triple << '\n';
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return -1;
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}
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bool ErrorOccurred = false;
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SourceMgr SM;
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SM.AddNewSourceBuffer(&Buffer, SMLoc());
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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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ErrorOccurred |= ByteArrayFromString(ByteArray, Str, SM);
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if (!ByteArray.empty())
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ErrorOccurred |= PrintInsts(*DisAsm, *IP, ByteArray, SM);
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return ErrorOccurred;
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}
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static int byteArrayReader(uint8_t *B, uint64_t A, void *Arg) {
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ByteArrayTy &ByteArray = *((ByteArrayTy*)Arg);
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if (A >= ByteArray.size())
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return -1;
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*B = ByteArray[A].first;
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return 0;
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}
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static int verboseEvaluator(uint64_t *V, unsigned R, void *Arg) {
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EDDisassemblerRef &disassembler = *((EDDisassemblerRef*)Arg);
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const char *regName;
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if (!EDGetRegisterName(®Name,
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disassembler,
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R))
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outs() << "[" << regName << "/" << R << "]";
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if (EDRegisterIsStackPointer(disassembler, R))
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outs() << "(sp)";
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if (EDRegisterIsProgramCounter(disassembler, R))
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outs() << "(pc)";
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*V = 0;
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return 0;
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}
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int Disassembler::disassembleEnhanced(const std::string &TS,
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MemoryBuffer &Buffer) {
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ByteArrayTy ByteArray;
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StringRef Str = Buffer.getBuffer();
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SourceMgr SM;
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SM.AddNewSourceBuffer(&Buffer, SMLoc());
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if (ByteArrayFromString(ByteArray, Str, SM)) {
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return -1;
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}
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EDDisassemblerRef disassembler;
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Triple T(TS);
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EDAssemblySyntax_t AS;
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switch (T.getArch()) {
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default:
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errs() << "error: no default assembly syntax for " << TS.c_str() << "\n";
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return -1;
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case Triple::arm:
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case Triple::thumb:
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AS = kEDAssemblySyntaxARMUAL;
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break;
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case Triple::x86:
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case Triple::x86_64:
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AS = kEDAssemblySyntaxX86ATT;
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break;
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}
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if (EDGetDisassembler(&disassembler,
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TS.c_str(),
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AS)) {
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errs() << "error: couldn't get disassembler for " << TS.c_str() << "\n";
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return -1;
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}
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EDInstRef inst;
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if (EDCreateInsts(&inst, 1, disassembler, byteArrayReader, 0,&ByteArray)
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!= 1) {
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errs() << "error: Didn't get an instruction\n";
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return -1;
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}
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int numTokens = EDNumTokens(inst);
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if (numTokens < 0) {
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errs() << "error: Couldn't count the instruction's tokens\n";
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return -1;
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}
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int tokenIndex;
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for (tokenIndex = 0; tokenIndex < numTokens; ++tokenIndex) {
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EDTokenRef token;
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if (EDGetToken(&token, inst, tokenIndex)) {
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errs() << "error: Couldn't get token\n";
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return -1;
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}
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const char *buf;
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if (EDGetTokenString(&buf, token)) {
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errs() << "error: Couldn't get string for token\n";
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return -1;
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}
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outs() << "[";
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int operandIndex = EDOperandIndexForToken(token);
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if (operandIndex >= 0)
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outs() << operandIndex << "-";
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if (EDTokenIsWhitespace(token)) {
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outs() << "w";
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} else if (EDTokenIsPunctuation(token)) {
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outs() << "p";
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} else if (EDTokenIsOpcode(token)) {
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outs() << "o";
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} else if (EDTokenIsLiteral(token)) {
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outs() << "l";
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} else if (EDTokenIsRegister(token)) {
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outs() << "r";
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} else {
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outs() << "?";
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}
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outs() << ":" << buf;
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if (EDTokenIsLiteral(token)) {
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outs() << "=";
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if (EDTokenIsNegativeLiteral(token))
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outs() << "-";
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uint64_t absoluteValue;
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if (EDLiteralTokenAbsoluteValue(&absoluteValue, token)) {
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errs() << "error: Couldn't get the value of a literal token\n";
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return -1;
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}
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outs() << absoluteValue;
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} else if (EDTokenIsRegister(token)) {
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outs() << "=";
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unsigned regID;
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if (EDRegisterTokenValue(®ID, token)) {
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errs() << "error: Couldn't get the ID of a register token\n";
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return -1;
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}
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outs() << "r" << regID;
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}
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outs() << "]";
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}
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outs() << " ";
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int numOperands = EDNumOperands(inst);
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if (numOperands < 0) {
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errs() << "error: Couldn't count operands\n";
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return -1;
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}
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int operandIndex;
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for (operandIndex = 0; operandIndex < numOperands; ++operandIndex) {
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outs() << operandIndex << ":";
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EDOperandRef operand;
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if (EDGetOperand(&operand,
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inst,
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operandIndex)) {
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errs() << "error: Couldn't get operand\n";
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return -1;
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}
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uint64_t evaluatedResult;
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EDEvaluateOperand(&evaluatedResult,
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operand,
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verboseEvaluator,
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&disassembler);
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outs() << " ";
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}
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outs() << "\n";
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return 0;
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}
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