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 &target,
88 const std::string &tripleString,
89 MemoryBuffer &buffer) {
90 // Set up disassembler
92 llvm::OwningPtr<const llvm::MCAsmInfo> asmInfo
93 (target.createAsmInfo(tripleString));
96 errs() << "error: no assembly info for target " << tripleString << "\n";
100 llvm::OwningPtr<const llvm::MCDisassembler> disassembler
101 (target.createMCDisassembler());
104 errs() << "error: no disassembler for target " << tripleString << "\n";
108 llvm::MCInstPrinter *instPrinter = target.createMCInstPrinter(0,
113 errs() << "error: no instruction printer for target " << tripleString
118 // Convert the input to a vector for disassembly.
120 std::vector<unsigned char> bytes;
122 StringRef str = buffer.getBuffer();
124 while (!str.empty()) {
125 if(str.find_first_of("\n") < str.find_first_not_of(" \t\n\r")) {
126 printInst(*disassembler, *instPrinter, bytes);
131 // Skip leading space.
132 str = str.substr(str.find_first_not_of(" \t\n\r"));
134 // Get the current token.
135 size_t next = str.find_first_of(" \t\n\r");
137 if(next == (size_t)StringRef::npos)
140 StringRef value = str.slice(0, next);
142 // Convert to a byte and add to the byte vector.
144 if (value.getAsInteger(0, byte) || byte > 255) {
145 errs() << "warning: invalid input token '" << value << "' of length "
149 bytes.push_back((unsigned char)byte);
151 str = str.substr(next);
155 printInst(*disassembler, *instPrinter, bytes);