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//===- HexDisassembler.cpp - Disassembler for hex strings -----------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This class implements the disassembler of strings of bytes written in
// hexadecimal, from standard input or from a file.
//
//===----------------------------------------------------------------------===//
#include "HexDisassembler.h"
#include "llvm/ADT/OwningPtr.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCDisassembler.h"
#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCInstPrinter.h"
#include "llvm/Target/TargetRegistry.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/MemoryObject.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Support/SourceMgr.h"
using namespace llvm;
class VectorMemoryObject : public MemoryObject {
private:
const std::vector<unsigned char> &Bytes;
public:
VectorMemoryObject(const std::vector<unsigned char> &bytes) :
Bytes(bytes) {
}
uint64_t getBase() const {
return 0;
}
uint64_t getExtent() const {
return Bytes.size();
}
int readByte(uint64_t addr, uint8_t *byte) const {
if (addr > getExtent())
return -1;
*byte = Bytes[addr];
return 0;
}
};
void printInst(const llvm::MCDisassembler &disassembler,
llvm::MCInstPrinter &instPrinter,
const std::vector<unsigned char> &bytes) {
// Wrap the vector in a MemoryObject.
VectorMemoryObject memoryObject(bytes);
// Disassemble it.
MCInst inst;
uint64_t size;
std::string verboseOStr;
llvm::raw_string_ostream verboseOS(verboseOStr);
if (disassembler.getInstruction(inst, size, memoryObject, 0, verboseOS)) {
instPrinter.printInst(&inst);
outs() << "\n";
} else {
errs() << "error: invalid instruction" << "\n";
errs() << "Diagnostic log:" << "\n";
errs() << verboseOStr.c_str() << "\n";
}
}
int HexDisassembler::disassemble(const Target &T, const std::string &Triple,
MemoryBuffer &Buffer) {
// Set up disassembler.
llvm::OwningPtr<const llvm::MCAsmInfo> AsmInfo(T.createAsmInfo(Triple));
if (!AsmInfo) {
errs() << "error: no assembly info for target " << Triple << "\n";
return -1;
}
llvm::OwningPtr<const llvm::MCDisassembler> DisAsm(T.createMCDisassembler());
if (!DisAsm) {
errs() << "error: no disassembler for target " << Triple << "\n";
return -1;
}
llvm::MCInstPrinter *InstPrinter = T.createMCInstPrinter(0, *AsmInfo, outs());
if (!InstPrinter) {
errs() << "error: no instruction printer for target " << Triple
<< "\n";
return -1;
}
SourceMgr SourceManager;
SourceManager.AddNewSourceBuffer(&Buffer, SMLoc());
// Convert the input to a vector for disassembly.
std::vector<unsigned char> ByteArray;
StringRef Str = Buffer.getBuffer();
while (!Str.empty()) {
// Strip horizontal whitespace.
if (size_t Pos = Str.find_first_not_of(" \t\r")) {
Str = Str.substr(Pos);
continue;
}
// If this is the end of a line or start of a comment, process the
// instruction we have so far.
if (Str[0] == '\n' || Str[0] == '#') {
// If we have bytes to process, do so.
if (!ByteArray.empty()) {
printInst(*DisAsm, *InstPrinter, ByteArray);
ByteArray.clear();
}
// Strip to the end of line if we already processed any bytes on this
// line. This strips the comment and/or the \n.
if (Str[0] == '\n')
Str = Str.substr(1);
else {
Str = Str.substr(Str.find_first_of('\n'));
if (!Str.empty())
Str = Str.substr(1);
}
continue;
}
// Get the current token.
size_t Next = Str.find_first_of(" \t\n\r#");
StringRef Value = Str.substr(0, Next);
// Convert to a byte and add to the byte vector.
unsigned ByteVal;
if (Value.getAsInteger(0, ByteVal) || ByteVal > 255) {
// If we have an error, print it and skip to the end of line.
SourceManager.PrintMessage(SMLoc::getFromPointer(Value.data()),
"invalid input token", "error");
Str = Str.substr(Str.find('\n'));
ByteArray.clear();
continue;
}
ByteArray.push_back((unsigned char)ByteVal);
Str = Str.substr(Next);
}
if (!ByteArray.empty())
printInst(*DisAsm, *InstPrinter, ByteArray);
return 0;
}
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