path: root/lib/CodeGen/CGDebugInfo.cpp

//===--- CGDebugInfo.cpp - Emit Debug Information for a Module ------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This coordinates the debug information generation while generating code.
//
//===----------------------------------------------------------------------===//

#include "CGDebugInfo.h"
#include "CodeGenModule.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/DeclObjC.h"
#include "clang/AST/Expr.h"
#include "clang/AST/RecordLayout.h"
#include "clang/Basic/SourceManager.h"
#include "clang/Basic/FileManager.h"
#include "clang/Frontend/CompileOptions.h"
#include "llvm/Constants.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Instructions.h"
#include "llvm/Intrinsics.h"
#include "llvm/Module.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/Support/Dwarf.h"
#include "llvm/System/Path.h"
#include "llvm/Target/TargetMachine.h"
using namespace clang;
using namespace clang::CodeGen;

CGDebugInfo::CGDebugInfo(CodeGenModule *m)
  : M(m), isMainCompileUnitCreated(false), DebugFactory(M->getModule()),
    BlockLiteralGenericSet(false) {
}

CGDebugInfo::~CGDebugInfo() {
  assert(RegionStack.empty() && "Region stack mismatch, stack not empty!");
}

void CGDebugInfo::setLocation(SourceLocation Loc) {
  if (Loc.isValid())
    CurLoc = M->getContext().getSourceManager().getInstantiationLoc(Loc);
}

/// getOrCreateCompileUnit - Get the compile unit from the cache or create a new
/// one if necessary. This returns null for invalid source locations.
llvm::DICompileUnit CGDebugInfo::getOrCreateCompileUnit(SourceLocation Loc) {
  // Get source file information.
  const char *FileName =  "<unknown>";
  SourceManager &SM = M->getContext().getSourceManager();
  unsigned FID = 0;
  if (Loc.isValid()) {
    PresumedLoc PLoc = SM.getPresumedLoc(Loc);
    FileName = PLoc.getFilename();
    FID = PLoc.getIncludeLoc().getRawEncoding();
  }

  // See if this compile unit has been used before.
  llvm::DICompileUnit &Unit = CompileUnitCache[FID];
  if (!Unit.isNull()) return Unit;

  // Get absolute path name.
  llvm::sys::Path AbsFileName(FileName);
  if (!AbsFileName.isAbsolute()) {
    llvm::sys::Path tmp = llvm::sys::Path::GetCurrentDirectory();
    tmp.appendComponent(FileName);
    AbsFileName = tmp;
  }

  // See if thie compile unit is representing main source file. Each source
  // file has corresponding compile unit. There is only one main source
  // file at a time.
  bool isMain = false;
  const LangOptions &LO = M->getLangOptions();
  const char *MainFileName = LO.getMainFileName();
  if (isMainCompileUnitCreated == false) {
    if (MainFileName) {
      if (!strcmp(AbsFileName.getLast().c_str(), MainFileName))
        isMain = true;
    } else {
      if (Loc.isValid() && SM.isFromMainFile(Loc))
        isMain = true;
    }
    if (isMain)
      isMainCompileUnitCreated = true;
  }

  unsigned LangTag;
  if (LO.CPlusPlus) {
    if (LO.ObjC1)
      LangTag = llvm::dwarf::DW_LANG_ObjC_plus_plus;
    else
      LangTag = llvm::dwarf::DW_LANG_C_plus_plus;
  } else if (LO.ObjC1) {
    LangTag = llvm::dwarf::DW_LANG_ObjC;
  } else if (LO.C99) {
    LangTag = llvm::dwarf::DW_LANG_C99;
  } else {
    LangTag = llvm::dwarf::DW_LANG_C89;
  }

  std::string Producer = "clang 1.0";// FIXME: clang version.
  bool isOptimized = LO.Optimize;
  const char *Flags = "";   // FIXME: Encode command line options.

  // Figure out which version of the ObjC runtime we have.
  unsigned RuntimeVers = 0;
  if (LO.ObjC1)
    RuntimeVers = LO.ObjCNonFragileABI ? 2 : 1;

  // Create new compile unit.
  return Unit = DebugFactory.CreateCompileUnit(LangTag, AbsFileName.getLast(),
                                               AbsFileName.getDirname(),
                                               Producer, isMain, isOptimized,
                                               Flags, RuntimeVers);
}

/// CreateType - Get the Basic type from the cache or create a new
/// one if necessary.
llvm::DIType CGDebugInfo::CreateType(const BuiltinType *BT,
                                     llvm::DICompileUnit Unit) {
  unsigned Encoding = 0;
  switch (BT->getKind()) {
  default:
  case BuiltinType::Void:
    return llvm::D