1 //===- HexDisassembler.cpp - Disassembler for hex strings -----------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This class implements the disassembler of strings of bytes written in
11 // hexadecimal, from standard input or from a file.
13 //===----------------------------------------------------------------------===//
15 #include "HexDisassembler.h"
17 #include "llvm/ADT/OwningPtr.h"
18 #include "llvm/MC/MCAsmInfo.h"
19 #include "llvm/MC/MCDisassembler.h"
20 #include "llvm/MC/MCInst.h"
21 #include "llvm/MC/MCInstPrinter.h"
22 #include "llvm/Target/TargetRegistry.h"
23 #include "llvm/Support/MemoryBuffer.h"
24 #include "llvm/Support/MemoryObject.h"
25 #include "llvm/Support/raw_ostream.h"
31 class VectorMemoryObject : public MemoryObject {
33 const std::vector<unsigned char> &Bytes;
35 VectorMemoryObject(const std::vector<unsigned char> &bytes) :
39 uint64_t getBase() const {
43 uint64_t getExtent() const {
47 int readByte(uint64_t addr, uint8_t *byte) const {
48 if (addr > getExtent())
57 void printInst(const llvm::MCDisassembler &disassembler,
58 llvm::MCInstPrinter &instPrinter,
59 const std::vector<unsigned char> &bytes) {
60 // Wrap the vector in a MemoryObject.
62 VectorMemoryObject memoryObject(bytes);
69 std::string verboseOStr;
70 llvm::raw_string_ostream verboseOS(verboseOStr);
72 if (disassembler.getInstruction(inst,
77 instPrinter.printInst(&inst);
81 errs() << "error: invalid instruction" << "\n";
82 errs() << "Diagnostic log:" << "\n";
83 errs() << verboseOStr.c_str() << "\n";
87 int HexDisassembler::disassemble(const Target &T, const std::string &Triple,
88 MemoryBuffer &Buffer) {
89 // Set up disassembler.
90 llvm::OwningPtr<const llvm::MCAsmInfo> AsmInfo(T.createAsmInfo(Triple));
93 errs() << "error: no assembly info for target " << Triple << "\n";
97 llvm::OwningPtr<const llvm::MCDisassembler> DisAsm(T.createMCDisassembler());
99 errs() << "error: no disassembler for target " << Triple << "\n";
103 llvm::MCInstPrinter *InstPrinter = T.createMCInstPrinter(0, *AsmInfo, outs());
106 errs() << "error: no instruction printer for target " << Triple
111 // Convert the input to a vector for disassembly.
112 std::vector<unsigned char> ByteArray;
114 StringRef Str = Buffer.getBuffer();
116 while (!Str.empty()) {
117 // Strip horizontal whitespace.
118 if (size_t Pos = Str.find_first_not_of(" \t\r")) {
119 Str = Str.substr(Pos);
123 // If this is the end of a line or start of a comment, process the
124 // instruction we have so far.
125 if (Str[0] == '\n' || Str[0] == '#') {
126 // If we have bytes to process, do so.
127 if (!ByteArray.empty()) {
128 printInst(*DisAsm, *InstPrinter, ByteArray);
132 // Strip to the end of line if we already processed any bytes on this
133 // line. This strips the comment and/or the \n.
137 Str = Str.substr(Str.find_first_of('\n'));
144 // Get the current token.
145 size_t Next = Str.find_first_of(" \t\n\r#");
146 StringRef Value = Str.substr(0, Next);
148 // Convert to a byte and add to the byte vector.
150 if (Value.getAsInteger(0, ByteVal) || ByteVal > 255) {
151 errs() << "warning: invalid input token '" << Value << "' of length "
154 ByteArray.push_back((unsigned char)ByteVal);
156 Str = Str.substr(Next);
159 if (!ByteArray.empty())
160 printInst(*DisAsm, *InstPrinter, ByteArray);