rename HexDisassembler -> Disassembler, it works on any input
integer encoding (0123, 0b10101, 42, etc).
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@91934 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/llvm-mc/Disassembler.cpp b/tools/llvm-mc/Disassembler.cpp
new file mode 100644
index 0000000..5fde712
--- /dev/null
+++ b/tools/llvm-mc/Disassembler.cpp
@@ -0,0 +1,165 @@
+//===- Disassembler.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 "Disassembler.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;
+
+typedef std::vector<std::pair<unsigned char, const char*> > ByteArrayTy;
+
+namespace {
+class VectorMemoryObject : public MemoryObject {
+private:
+ const ByteArrayTy &Bytes;
+public:
+ VectorMemoryObject(const ByteArrayTy &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].first;
+ return 0;
+ }
+};
+}
+
+static bool PrintInst(const llvm::MCDisassembler &DisAsm,
+ llvm::MCInstPrinter &Printer, const ByteArrayTy &Bytes,
+ SourceMgr &SM) {
+ // Wrap the vector in a MemoryObject.
+ VectorMemoryObject memoryObject(Bytes);
+
+ // Disassemble it to a string and get the size of the instruction.
+ MCInst Inst;
+ uint64_t Size;
+
+ if (!DisAsm.getInstruction(Inst, Size, memoryObject, 0,
+ /*REMOVE*/ nulls())) {
+ SM.PrintMessage(SMLoc::getFromPointer(Bytes[0].second),
+ "invalid instruction encoding", "error");
+ return true;
+ }
+
+ Printer.printInst(&Inst);
+ outs() << "\n";
+
+ // If the disassembled instruction was smaller than the number of bytes we
+ // read, reject the excess bytes.
+ if (Bytes.size() != Size) {
+ SM.PrintMessage(SMLoc::getFromPointer(Bytes[Size].second),
+ "excess data detected in input", "error");
+ return true;
+ }
+
+ return false;
+}
+
+int Disassembler::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;
+ }
+
+ bool ErrorOccurred = false;
+
+ SourceMgr SM;
+ SM.AddNewSourceBuffer(&Buffer, SMLoc());
+
+ // Convert the input to a vector for disassembly.
+ ByteArrayTy 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()) {
+ ErrorOccurred |= PrintInst(*DisAsm, *InstPrinter, ByteArray, SM);
+ 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.
+ SM.PrintMessage(SMLoc::getFromPointer(Value.data()),
+ "invalid input token", "error");
+ ErrorOccurred = true;
+ Str = Str.substr(Str.find('\n'));
+ ByteArray.clear();
+ continue;
+ }
+
+ ByteArray.push_back(std::make_pair((unsigned char)ByteVal, Value.data()));
+ Str = Str.substr(Next);
+ }
+
+ if (!ByteArray.empty())
+ ErrorOccurred |= PrintInst(*DisAsm, *InstPrinter, ByteArray, SM);
+
+ return ErrorOccurred;
+}