1 files changed, 360 insertions, 0 deletions
diff --git a/contrib/llvm/tools/llvm-mc/Disassembler.cpp b/contrib/llvm/tools/llvm-mc/Disassembler.cpp
new file mode 100644
index 0000000..37b2cb8
--- /dev/null
+++ b/contrib/llvm/tools/llvm-mc/Disassembler.cpp
@@ -0,0 +1,360 @@
+//===- 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/ADT/Triple.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"
+
+#include "llvm-c/EnhancedDisassembly.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 PrintInsts(const MCDisassembler &DisAsm,
+                       MCInstPrinter &Printer, const ByteArrayTy &Bytes,
+                       SourceMgr &SM) {
+  // Wrap the vector in a MemoryObject.
+  VectorMemoryObject memoryObject(Bytes);
+  
+  // Disassemble it to strings.
+  uint64_t Size;
+  uint64_t Index;
+  
+  for (Index = 0; Index < Bytes.size(); Index += Size) {
+    MCInst Inst;
+    
+    if (DisAsm.getInstruction(Inst, Size, memoryObject, Index, 
+                               /*REMOVE*/ nulls())) {
+      Printer.printInst(&Inst, outs());
+      outs() << "\n";
+    } else {
+      SM.PrintMessage(SMLoc::getFromPointer(Bytes[Index].second),
+                      "invalid instruction encoding", "warning");
+      if (Size == 0)
+        Size = 1; // skip illegible bytes
+    }
+  }
+  
+  return false;
+}
+
+static bool ByteArrayFromString(ByteArrayTy &ByteArray, 
+                                StringRef &Str, 
+                                SourceMgr &SM) {
+  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, remove the rest of
+    // the line.
+    if (Str[0] == '\n' || Str[0] == '#') {
+      // 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");
+      Str = Str.substr(Str.find('\n'));
+      ByteArray.clear();
+      continue;
+    }
+    
+    ByteArray.push_back(std::make_pair((unsigned char)ByteVal, Value.data()));
+    Str = Str.substr(Next);
+  }
+  
+  return false;
+}
+
+int Disassembler::disassemble(const Target &T, const std::string &Triple,
+                              MemoryBuffer &Buffer) {
+  // Set up disassembler.
+  OwningPtr<const MCAsmInfo> AsmInfo(T.createAsmInfo(Triple));
+  
+  if (!AsmInfo) {
+    errs() << "error: no assembly info for target " << Triple << "\n";
+    return -1;
+  }
+  
+  OwningPtr<const MCDisassembler> DisAsm(T.createMCDisassembler());
+  if (!DisAsm) {
+    errs() << "error: no disassembler for target " << Triple << "\n";
+    return -1;
+  }
+  
+  int AsmPrinterVariant = AsmInfo->getAssemblerDialect();
+  OwningPtr<MCInstPrinter> IP(T.createMCInstPrinter(AsmPrinterVariant,
+                                                    *AsmInfo));
+  if (!IP) {
+    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();
+  
+  ErrorOccurred |= ByteArrayFromString(ByteArray, Str, SM);
+  
+  if (!ByteArray.empty())
+    ErrorOccurred |= PrintInsts(*DisAsm, *IP, ByteArray, SM);
+    
+  return ErrorOccurred;
+}
+
+static int byteArrayReader(uint8_t *B, uint64_t A, void *Arg) {
+  ByteArrayTy &ByteArray = *((ByteArrayTy*)Arg);
+  
+  if (A >= ByteArray.size())
+    return -1;
+  
+  *B = ByteArray[A].first;
+  
+  return 0;
+}
+
+static int verboseEvaluator(uint64_t *V, unsigned R, void *Arg) {
+  EDDisassemblerRef &disassembler = *((EDDisassemblerRef*)Arg);
+  
+  const char *regName;
+  
+  if (!EDGetRegisterName(&regName,
+                        disassembler,
+                        R))
+    outs() << "[" << regName << "/" << R << "]";
+  if (EDRegisterIsStackPointer(disassembler, R))
+    outs() << "(sp)";
+  if (EDRegisterIsProgramCounter(disassembler, R))
+    outs() << "(pc)";
+  
+  *V = 0;
+  
+  return 0;
+}
+
+int Disassembler::disassembleEnhanced(const std::string &TS, 
+                                      MemoryBuffer &Buffer) {
+  ByteArrayTy ByteArray;
+  StringRef Str = Buffer.getBuffer();
+  SourceMgr SM;
+  
+  SM.AddNewSourceBuffer(&Buffer, SMLoc());
+  
+  if (ByteArrayFromString(ByteArray, Str, SM)) {
+    return -1;
+  }
+  
+  EDDisassemblerRef disassembler;
+  
+  Triple T(TS);
+  EDAssemblySyntax_t AS;
+  
+  switch (T.getArch()) {
+  default:
+    errs() << "error: no default assembly syntax for " << TS.c_str() << "\n";
+    return -1;
+  case Triple::arm:
+  case Triple::thumb:
+    AS = kEDAssemblySyntaxARMUAL;
+    break;
+  case Triple::x86:
+  case Triple::x86_64:
+    AS = kEDAssemblySyntaxX86ATT;
+    break;
+  }
+  
+  if (EDGetDisassembler(&disassembler, 
+                        TS.c_str(),
+                        AS)) {
+    errs() << "error: couldn't get disassembler for " << TS.c_str() << "\n";
+    return -1;
+  }
+  
+  EDInstRef inst;
+  
+  if (EDCreateInsts(&inst, 1, disassembler, byteArrayReader, 0,&ByteArray) 
+      != 1) {
+    errs() << "error: Didn't get an instruction\n";
+    return -1;
+  }
+  
+  int numTokens = EDNumTokens(inst);
+  
+  if (numTokens < 0) {
+    errs() << "error: Couldn't count the instruction's tokens\n";
+    return -1;
+  }
+  
+  int tokenIndex;
+  
+  for (tokenIndex = 0; tokenIndex < numTokens; ++tokenIndex) {
+    EDTokenRef token;
+    
+    if (EDGetToken(&token, inst, tokenIndex)) {
+      errs() << "error: Couldn't get token\n";
+      return -1;
+    }
+    
+    const char *buf;
+    
+    if (EDGetTokenString(&buf, token)) {
+      errs() << "error: Couldn't get string for token\n";
+      return -1;
+    }
+    
+    outs() << "[";
+    
+    int operandIndex = EDOperandIndexForToken(token);
+    
+    if (operandIndex >= 0)
+      outs() << operandIndex << "-";
+    
+    if (EDTokenIsWhitespace(token)) {
+      outs() << "w";
+    } else if (EDTokenIsPunctuation(token)) {
+      outs() << "p";
+    } else if (EDTokenIsOpcode(token)) {
+      outs() << "o";
+    } else if (EDTokenIsLiteral(token)) {
+      outs() << "l";
+    } else if (EDTokenIsRegister(token)) {
+      outs() << "r";
+    } else {
+      outs() << "?";
+    }
+    
+    outs() << ":" << buf;
+  
+    if (EDTokenIsLiteral(token)) {
+      outs() << "=";
+      if (EDTokenIsNegativeLiteral(token))
+        outs() << "-";
+      uint64_t absoluteValue;
+      if (EDLiteralTokenAbsoluteValue(&absoluteValue, token)) {
+        errs() << "error: Couldn't get the value of a literal token\n";
+        return -1;
+      }
+      outs() << absoluteValue;
+    } else if (EDTokenIsRegister(token)) {
+      outs() << "=";
+      unsigned regID;
+      if (EDRegisterTokenValue(&regID, token)) {
+        errs() << "error: Couldn't get the ID of a register token\n";
+        return -1;
+      }
+      outs() << "r" << regID;
+    }
+    
+    outs() << "]";
+  }
+  
+  outs() << " ";
+    
+  if (EDInstIsBranch(inst))
+    outs() << "<br> ";
+  if (EDInstIsMove(inst))
+    outs() << "<mov> ";
+  
+  int numOperands = EDNumOperands(inst);
+  
+  if (numOperands < 0) {
+    errs() << "error: Couldn't count operands\n";
+    return -1;
+  }
+  
+  int operandIndex;
+  
+  for (operandIndex = 0; operandIndex < numOperands; ++operandIndex) {
+    outs() << operandIndex << ":";
+    
+    EDOperandRef operand;
+    
+    if (EDGetOperand(&operand,
+                     inst,
+                     operandIndex)) {
+      errs() << "error: Couldn't get operand\n";
+      return -1;
+    }
+    
+    uint64_t evaluatedResult;
+    
+    EDEvaluateOperand(&evaluatedResult, 
+                      operand, 
+                      verboseEvaluator, 
+                      &disassembler);
+      
+    outs() << "=" << evaluatedResult;
+    
+    outs() << " ";
+  }
+  
+  outs() << "\n";
+  
+  return 0;
+}
+