Revert r200340, "Add line table debug info to COFF files when using a win32 triple."

It was incompatible with --target=i686-win32.

llvm-svn: 200375

1 files changed, 0 insertions, 323 deletions

diff --git a/llvm/lib/CodeGen/AsmPrinter/WinCodeViewLineTables.cpp b/llvm/lib/CodeGen/AsmPrinter/WinCodeViewLineTables.cpp
deleted file mode 100644
index 1cb69e97c05..00000000000
--- a/llvm/lib/CodeGen/AsmPrinter/WinCodeViewLineTables.cpp
+++ /dev/null
@@ -1,323 +0,0 @@
-//===-- llvm/lib/CodeGen/AsmPrinter/WinCodeViewLineTables.cpp --*- C++ -*--===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This file contains support for writing line tables info into COFF files.
-//
-//===----------------------------------------------------------------------===//
-
-#include "WinCodeViewLineTables.h"
-#include "llvm/MC/MCExpr.h"
-#include "llvm/MC/MCSymbol.h"
-#include "llvm/Support/COFF.h"
-
-namespace llvm {
-
-StringRef WinCodeViewLineTables::getFullFilepath(const MDNode *S) {
-  assert(S);
-  DIDescriptor D(S);
-  assert((D.isCompileUnit() || D.isFile() || D.isSubprogram() ||
-          D.isLexicalBlockFile() || D.isLexicalBlock()) &&
-         "Unexpected scope info");
-
-  DIScope Scope(S);
-  StringRef Dir = Scope.getDirectory(),
-            Filename = Scope.getFilename();
-  char *&Result = DirAndFilenameToFilepathMap[std::make_pair(Dir, Filename)];
-  if (Result != 0)
-    return Result;
-
-  // Clang emits directory and relative filename info into the IR, but CodeView
-  // operates on full paths.  We could change Clang to emit full paths too, but
-  // that would increase the IR size and probably not needed for other users.
-  // For now, just concatenate and canonicalize the path here.
-  std::string Filepath;
-  if (Filename.find(':') == 1)
-    Filepath = Filename;
-  else
-    Filepath = (Dir + Twine("\\") + Filename).str();
-
-  // Canonicalize the path.  We have to do it textually because we may no longer
-  // have access the file in the filesystem.
-  // First, replace all slashes with backslashes.
-  std::replace(Filepath.begin(), Filepath.end(), '/', '\\');
-
-  // Remove all "\.\" with "\".
-  size_t Cursor = 0;
-  while ((Cursor = Filepath.find("\\.\\", Cursor)) != std::string::npos)
-    Filepath.erase(Cursor, 2);
-
-  // Replace all "\XXX\..\" with "\".  Don't try too hard though as the original
-  // path should be well-formatted, e.g. start with a drive letter, etc.
-  Cursor = 0;
-  while ((Cursor = Filepath.find("\\..\\", Cursor)) != std::string::npos) {
-    // Something's wrong if the path starts with "\..\", abort.
-    if (Cursor == 0)
-      break;
-
-    size_t PrevSlash = Filepath.rfind('\\', Cursor - 1);
-    if (PrevSlash == std::string::npos)
-      // Something's wrong, abort.
-      break;
-
-    Filepath.erase(PrevSlash, Cursor + 3 - PrevSlash);
-    // The next ".." might be following the one we've just erased.
-    Cursor = PrevSlash;
-  }
-
-  // Remove all duplicate backslashes.
-  Cursor = 0;
-  while ((Cursor = Filepath.find("\\\\", Cursor)) != std::string::npos)
-    Filepath.erase(Cursor, 1);
-
-  Result = strdup(Filepath.c_str());
-  return StringRef(Result);
-}
-
-void WinCodeViewLineTables::maybeRecordLocation(DebugLoc DL,
-                                                const MachineFunction *MF) {
-  const MDNode *Scope = DL.getScope(MF->getFunction()->getContext());
-  if (!Scope)
-    return;
-  StringRef Filename = getFullFilepath(Scope);
-
-  // Skip this instruction if it has the same file:line as the previous one.
-  assert(CurFn);
-  if (!CurFn->Instrs.empty()) {
-    const InstrInfoTy &LastInstr = InstrInfo[CurFn->Instrs.back()];
-    if (LastInstr.Filename == Filename && LastInstr.LineNumber == DL.getLine())
-      return;
-  }
-  FileNameRegistry.add(Filename);
-
-  MCSymbol *MCL = Asm->MMI->getContext().CreateTempSymbol();
-  Asm->OutStreamer.EmitLabel(MCL);
-  CurFn->Instrs.push_back(MCL);
-  InstrInfo[MCL] = InstrInfoTy(Filename, DL.getLine());
-}
-
-WinCodeViewLineTables::WinCodeViewLineTables(AsmPrinter *Asm)
-    : Asm(Asm), CurFn(0) {
-  // Tell MMI that we have debug info.
-  Asm->MMI->setDebugInfoAvailability(true);
-}
-
-static void EmitLabelDiff(MCStreamer &Streamer,
-                          const MCSymbol *From, const MCSymbol *To) {
-  MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None;
-  MCContext &Context = Streamer.getContext();
-  const MCExpr *FromRef = MCSymbolRefExpr::Create(From, Variant, Context),
-               *ToRef   = MCSymbolRefExpr::Create(To, Variant, Context);
-  const MCExpr *AddrDelta =
-      MCBinaryExpr::Create(MCBinaryExpr::Sub, ToRef, FromRef, Context);
-  Streamer.EmitValue(AddrDelta, 4);
-}
-
-void WinCodeViewLineTables::emitDebugInfoForFunction(const Function *GV) {
-  // For each function there is a separate subsection
-  // which holds the PC to file:line table.
-  const MCSymbol *Fn = Asm->getSymbol(GV);
-  const FunctionInfo &FI = FnDebugInfo[GV];
-  assert(Fn);
-  assert(FI.Instrs.size() > 0);
-
-  // PCs/Instructions are grouped into segments sharing the same filename.
-  // Pre-calculate the lengths (in instructions) of these segments and store
-  // them in a map for convenience.  Each index in the map is the sequential
-  // number of the respective instruction that starts a new segment.
-  DenseMap<size_t, size_t> FilenameSegmentLengths;
-  size_t LastSegmentEnd = 0;
-  StringRef PrevFilename = InstrInfo[FI.Instrs[0]].Filename;
-  for (size_t J = 1, F = FI.Instrs.size(); J != F; ++J) {
-    if (PrevFilename == InstrInfo[FI.Instrs[J]].Filename)
-      continue;
-    FilenameSegmentLengths[LastSegmentEnd] = J - LastSegmentEnd;
-    LastSegmentEnd = J;
-    PrevFilename = InstrInfo[FI.Instrs[J]].Filename;
-  }
-  FilenameSegmentLengths[LastSegmentEnd] = FI.Instrs.size() - LastSegmentEnd;
-
-  // Emit the control code of the subsection followed by the payload size.
-  Asm->OutStreamer.AddComment(
-      "Linetable subsection for " + Twine(Fn->getName()));
-  Asm->EmitInt32(COFF::DEBUG_LINE_TABLE_SUBSECTION);
-  MCSymbol *SubsectionBegin = Asm->MMI->getContext().CreateTempSymbol(),
-           *SubsectionEnd = Asm->MMI->getContext().CreateTempSymbol();
-  EmitLabelDiff(Asm->OutStreamer, SubsectionBegin, SubsectionEnd);
-  Asm->OutStreamer.EmitLabel(SubsectionBegin);
-
-  // Identify the function this subsection is for.
-  Asm->OutStreamer.EmitCOFFSecRel32(Fn);
-  Asm->OutStreamer.EmitCOFFSectionIndex(Fn);
-
-  // Length of the function's code, in bytes.
-  EmitLabelDiff(Asm->OutStreamer, Fn, FI.End);
-
-  // PC-to-linenumber lookup table:
-  MCSymbol *FileSegmentEnd = 0;
-  for (size_t J = 0, F = FI.Instrs.size(); J != F; ++J) {
-    MCSymbol *Instr = FI.Instrs[J];
-    assert(InstrInfo.count(Instr));
-
-    if (FilenameSegmentLengths.count(J)) {
-      // We came to a beginning of a new filename segment.
-      if (FileSegmentEnd)
-        Asm->OutStreamer.EmitLabel(FileSegmentEnd);
-      StringRef CurFilename = InstrInfo[FI.Instrs[J]].Filename;
-      assert(FileNameRegistry.Infos.count(CurFilename));
-      size_t IndexInStringTable =
-          FileNameRegistry.Infos[CurFilename].FilenameID;
-      // Each segment starts with the offset of the filename
-      // in the string table.
-      Asm->OutStreamer.AddComment(
-          "Segment for file '" + Twine(CurFilename) + "' begins");
-      MCSymbol *FileSegmentBegin = Asm->MMI->getContext().CreateTempSymbol();
-      Asm->OutStreamer.EmitLabel(FileSegmentBegin);
-      Asm->EmitInt32(8 * IndexInStringTable);
-
-      // Number of PC records in the lookup table.
-      size_t SegmentLength = FilenameSegmentLengths[J];
-      Asm->EmitInt32(SegmentLength);
-
-      // Full size of the segment for this filename, including the prev two
-      // records.
-      FileSegmentEnd = Asm->MMI->getContext().CreateTempSymbol();
-      EmitLabelDiff(Asm->OutStreamer, FileSegmentBegin, FileSegmentEnd);
-    }
-
-    // The first PC with the given linenumber and the linenumber itself.
-    EmitLabelDiff(Asm->OutStreamer, Fn, Instr);
-    Asm->EmitInt32(InstrInfo[Instr].LineNumber);
-  }
-
-  if (FileSegmentEnd)
-    Asm->OutStreamer.EmitLabel(FileSegmentEnd);
-  Asm->OutStreamer.EmitLabel(SubsectionEnd);
-}
-
-void WinCodeViewLineTables::endModule() {
-  if (FnDebugInfo.empty())
-    return;
-
-  Asm->OutStreamer.SwitchSection(
-      Asm->getObjFileLowering().getCOFFDebugSymbolsSection());
-  Asm->EmitInt32(COFF::DEBUG_SECTION_MAGIC);
-
-  // The COFF .debug$S section consists of several subsections, each starting
-  // with a 4-byte control code (e.g. 0xF1, 0xF2, etc) and then a 4-byte length
-  // of the payload followed by the payload itself.  The subsections are 4-byte
-  // aligned.
-
-  for (size_t I = 0, E = VisitedFunctions.size(); I != E; ++I)
-    emitDebugInfoForFunction(VisitedFunctions[I]);
-
-  // This subsection holds a file index to offset in string table table.
-  Asm->OutStreamer.AddComment("File index to string table offset subsection");
-  Asm->EmitInt32(COFF::DEBUG_INDEX_SUBSECTION);
-  size_t NumFilenames = FileNameRegistry.Infos.size();
-  Asm->EmitInt32(8 * NumFilenames);
-  for (size_t I = 0, E = FileNameRegistry.Filenames.size(); I != E; ++I) {
-    StringRef Filename = FileNameRegistry.Filenames[I];
-    // For each unique filename, just write it's offset in the string table.
-    Asm->EmitInt32(FileNameRegistry.Infos[Filename].StartOffset);
-    // The function name offset is not followed by any additional data.
-    Asm->EmitInt32(0);
-  }
-
-  // This subsection holds the string table.
-  Asm->OutStreamer.AddComment("String table");
-  Asm->EmitInt32(COFF::DEBUG_STRING_TABLE_SUBSECTION);
-  Asm->EmitInt32(FileNameRegistry.LastOffset);
-  // The payload starts with a null character.
-  Asm->EmitInt8(0);
-
-  for (size_t I = 0, E = FileNameRegistry.Filenames.size(); I != E; ++I) {
-    // Just emit unique filenames one by one, separated by a null character.
-    Asm->OutStreamer.EmitBytes(FileNameRegistry.Filenames[I]);
-    Asm->EmitInt8(0);
-  }
-
-  // No more subsections. Fill with zeros to align the end of the section by 4.
-  Asm->OutStreamer.EmitFill((-FileNameRegistry.LastOffset) % 4, 0);
-
-  clear();
-}
-
-void WinCodeViewLineTables::beginFunction(const MachineFunction *MF) {
-  assert(!CurFn && "Can't process two functions at once!");
-
-  if (!Asm->MMI->hasDebugInfo())
-    return;
-
-  // Grab the lexical scopes for the function, if we don't have any of those
-  // then we're not going to be able to do anything.
-  LScopes.initialize(*MF);
-  if (LScopes.empty())
-    return;
-
-  const Function *GV = MF->getFunction();
-  assert(FnDebugInfo.count(GV) == false);
-  VisitedFunctions.push_back(GV);
-  CurFn = &FnDebugInfo[GV];
-
-  // Find the end of the function prolog.
-  // FIXME: is there a simpler a way to do this? Can we just search
-  // for the first instruction of the function, not the last of the prolog?
-  DebugLoc PrologEndLoc;
-  bool EmptyPrologue = true;
-  for (MachineFunction::const_iterator I = MF->begin(), E = MF->end();
-       I != E && PrologEndLoc.isUnknown(); ++I) {
-    for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end();
-         II != IE; ++II) {
-      const MachineInstr *MI = II;
-      if (MI->isDebugValue())
-        continue;
-
-      // First known non-DBG_VALUE and non-frame setup location marks
-      // the beginning of the function body.
-      // FIXME: do we need the first subcondition?
-      if (!MI->getFlag(MachineInstr::FrameSetup) &&
-          (!MI->getDebugLoc().isUnknown())) {
-        PrologEndLoc = MI->getDebugLoc();
-        break;
-      }
-      EmptyPrologue = false;
-    }
-  }
-  // Record beginning of function if we have a non-empty prologue.
-  if (!PrologEndLoc.isUnknown() && !EmptyPrologue) {
-    DebugLoc FnStartDL =
-        PrologEndLoc.getFnDebugLoc(MF->getFunction()->getContext());
-    maybeRecordLocation(FnStartDL, MF);
-  }
-}
-
-void WinCodeViewLineTables::endFunction(const MachineFunction *) {
-  if (!CurFn)  // We haven't created any debug info for this function.
-    return;
-
-  if (CurFn->Instrs.empty())
-    llvm_unreachable("Can this ever happen?");
-
-  // Define end label for subprogram.
-  MCSymbol *FunctionEndSym = Asm->OutStreamer.getContext().CreateTempSymbol();
-  Asm->OutStreamer.EmitLabel(FunctionEndSym);
-  CurFn->End = FunctionEndSym;
-  CurFn = 0;
-}
-
-void WinCodeViewLineTables::beginInstruction(const MachineInstr *MI) {
-  // Ignore DBG_VALUE locations and function prologue.
-  if (MI->isDebugValue() || MI->getFlag(MachineInstr::FrameSetup))
-    return;
-  DebugLoc DL = MI->getDebugLoc();
-  if (DL == PrevInstLoc || DL.isUnknown())
-    return;
-  maybeRecordLocation(DL, Asm->MF);
-}
-}