path: root/lib/Target/X86/AsmPrinter/X86ATTAsmPrinter.cpp

//===-- X86ATTAsmPrinter.cpp - Convert X86 LLVM code to AT&T assembly -----===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains a printer that converts from our internal representation
// of machine-dependent LLVM code to AT&T format assembly
// language. This printer is the output mechanism used by `llc'.
//
//===----------------------------------------------------------------------===//

#define DEBUG_TYPE "asm-printer"
#include "X86ATTAsmPrinter.h"
#include "X86.h"
#include "X86COFF.h"
#include "X86MachineFunctionInfo.h"
#include "X86TargetMachine.h"
#include "X86TargetAsmInfo.h"
#include "llvm/CallingConv.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Module.h"
#include "llvm/Type.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/CodeGen/DwarfWriter.h"
#include "llvm/CodeGen/MachineJumpTableInfo.h"
#include "llvm/Support/Mangler.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetAsmInfo.h"
#include "llvm/Target/TargetOptions.h"
using namespace llvm;

STATISTIC(EmittedInsts, "Number of machine instrs printed");

static std::string getPICLabelString(unsigned FnNum,
                                     const TargetAsmInfo *TAI,
                                     const X86Subtarget* Subtarget) {
  std::string label;
  if (Subtarget->isTargetDarwin())
    label =  "\"L" + utostr_32(FnNum) + "$pb\"";
  else if (Subtarget->isTargetELF())
    label = ".Lllvm$" + utostr_32(FnNum) + "." "$piclabel";
  else
    assert(0 && "Don't know how to print PIC label!\n");

  return label;
}

static X86MachineFunctionInfo calculateFunctionInfo(const Function *F,
                                                    const TargetData *TD) {
  X86MachineFunctionInfo Info;
  uint64_t Size = 0;

  switch (F->getCallingConv()) {
  case CallingConv::X86_StdCall:
    Info.setDecorationStyle(StdCall);
    break;
  case CallingConv::X86_FastCall:
    Info.setDecorationStyle(FastCall);
    break;
  default:
    return Info;
  }

  unsigned argNum = 1;
  for (Function::const_arg_iterator AI = F->arg_begin(), AE = F->arg_end();
       AI != AE; ++AI, ++argNum) {
    const Type* Ty = AI->getType();

    // 'Dereference' type in case of byval parameter attribute
    if (F->paramHasAttr(argNum, Attribute::ByVal))
      Ty = cast<PointerType>(Ty)->getElementType();

    // Size should be aligned to DWORD boundary
    Size += ((TD->getTypePaddedSize(Ty) + 3)/4)*4;
  }

  // We're not supporting tooooo huge arguments :)
  Info.setBytesToPopOnReturn((unsigned int)Size);
  return Info;
}

/// PrintUnmangledNameSafely - Print out the printable characters in the name.
/// Don't print things like \n or \0.
static void PrintUnmangledNameSafely(const Value *V, raw_ostream &OS) {
  for (const char *Name = V->getNameStart(), *E = Name+V->getNameLen();
       Name != E; ++Name)
    if (isprint(*Name))
      OS << *Name;
}

/// decorateName - Query FunctionInfoMap and use this information for various
/// name decoration.
void X86ATTAsmPrinter::decorateName(std::string &Name,
                                    const GlobalValue *GV) {
  const Function *F = dyn_cast<Function>(GV);
  if (!F) return;

  // We don't want to decorate non-stdcall or non-fastcall functions right now
  unsigned CC = F->getCallingConv();
  if (CC != CallingConv::X86_StdCall && CC != CallingConv::X86_FastCall)
    return;

  // Decorate names only when we're targeting Cygwin/Mingw32 targets
  if (!Subtarget->isTargetCygMing())
    return;

  FMFInfoMap::const_iterator info_item = FunctionInfoMap.find(F);

  const X86MachineFunctionInfo *Info;
  if (info_item == FunctionInfoMap.end()) {
    // Calculate apropriate function info and populate map