path: root/lib/Target/X86/Printer.cpp

//===-- X86/Printer.cpp - Convert X86 code to human readable rep. ---------===//
//
// This file contains a printer that converts from our internal representation
// of LLVM code to a nice human readable form that is suitable for debugging.
//
//===----------------------------------------------------------------------===//

#include "X86.h"
#include "X86InstrInfo.h"
#include "llvm/Function.h"
#include "llvm/Constant.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineConstantPool.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "Support/Statistic.h"
#include "Support/hash_map"
#include "llvm/Type.h"
#include "llvm/Constants.h"
#include "llvm/Assembly/Writer.h"
#include "llvm/DerivedTypes.h"
#include "llvm/SlotCalculator.h"
#include "Support/StringExtras.h"
#include "llvm/Module.h"

namespace {
  std::set<const Value *> MangledGlobals;
  struct Printer : public MachineFunctionPass {
    std::ostream &O;
    typedef std::map<const Value *, unsigned> ValueMapTy;
    ValueMapTy NumberForBB;
    Printer(std::ostream &o) : O(o) {}
    const TargetData *TD;
    std::string CurrentFnName;
    virtual const char *getPassName() const {
      return "X86 Assembly Printer";
    }

    void printMachineInstruction(const MachineInstr *MI, std::ostream &O,
				 const TargetMachine &TM) const;
    void printOp(std::ostream &O, const MachineOperand &MO,
		 const MRegisterInfo &RI, bool elideOffsetKeyword = false) const;
    void printMemReference(std::ostream &O, const MachineInstr *MI,
			   unsigned Op,
			   const MRegisterInfo &RI) const;
    void printConstantPool(MachineConstantPool *MCP);
    bool runOnMachineFunction(MachineFunction &F);    
    std::string ConstantExprToString(const ConstantExpr* CE);
    std::string valToExprString(const Value* V);
    bool doInitialization(Module &M);
    bool doFinalization(Module &M);
    void PrintZeroBytesToPad(int numBytes);
    void printConstantValueOnly(const Constant* CV, int numPadBytesAfter = 0);
    void printSingleConstantValue(const Constant* CV);
  };
} // end of anonymous namespace

/// createX86CodePrinterPass - Print out the specified machine code function to
/// the specified stream.  This function should work regardless of whether or
/// not the function is in SSA form or not.
///
Pass *createX86CodePrinterPass(std::ostream &O) {
  return new Printer(O);
}

// We don't want identifier names with ., space, or - in them, 
// so we replace them with underscores.
static std::string makeNameProper(std::string x) {
  std::string tmp;
  for (std::string::iterator sI = x.begin(), sEnd = x.end(); sI != sEnd; sI++)
    switch (*sI) {
    case '.': tmp += "d_"; break;
    case ' ': tmp += "s_"; break;
    case '-': tmp += "D_"; break;
    default:  tmp += *sI;
    }
  return tmp;
}

static std::string getValueName(const Value *V) {
  if (V->hasName()) { // Print out the label if it exists...
    // Name mangling occurs as follows:
    // - If V is not a global, mangling always occurs.
    // - Otherwise, mangling occurs when any of the following are true:
    //   1) V has internal linkage
    //   2) V's name would collide if it is not mangled.
    //
    if(const GlobalValue* gv = dyn_cast<GlobalValue>(V)) {
      if(!gv->hasInternalLinkage() && !MangledGlobals.count(gv)) {
        // No internal linkage, name will not collide -> no mangling.
        return makeNameProper(gv->getName());
      }
    }
    // Non-global, or global with internal linkage / colliding name -> mangle.
    return "l" + utostr(V->getType()->getUniqueID()) + "_" +
      makeNameProper(V->getName());      
  }
  static int Count = 0;
  Count++;
  return "ltmp_" + itostr(Count) + "_" + utostr(V->getType()->getUniqueID());
}

// valToExprString - Helper function for ConstantExprToString().
// Appends result to argument string S.
// 
std::string Printer::valToExprString(const Value* V) {
  std::string S;
  bool