Revert "[CodeView] Use assembler directives for line tables"

This reverts commit r259117.

The LineInfo constructor is defined in the codeview library and we have
to link against it now. Doing that isn't trivial, so reverting for now.

llvm-svn: 259126

1 files changed, 0 insertions, 222 deletions

diff --git a/llvm/lib/MC/MCCodeView.cpp b/llvm/lib/MC/MCCodeView.cpp
deleted file mode 100644
index 992edd0a8bc..00000000000
--- a/llvm/lib/MC/MCCodeView.cpp
+++ /dev/null
@@ -1,222 +0,0 @@
-//===- MCCodeView.h - Machine Code CodeView support -------------*- C++ -*-===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// Holds state from .cv_file and .cv_loc directives for later emission.
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm/MC/MCCodeView.h"
-#include "llvm/ADT/STLExtras.h"
-#include "llvm/DebugInfo/CodeView/CodeView.h"
-#include "llvm/DebugInfo/CodeView/Line.h"
-#include "llvm/MC/MCContext.h"
-#include "llvm/MC/MCObjectStreamer.h"
-#include "llvm/Support/COFF.h"
-
-using namespace llvm;
-using namespace llvm::codeview;
-
-CodeViewContext::CodeViewContext() {}
-
-CodeViewContext::~CodeViewContext() {
-  // If someone inserted strings into the string table but never actually
-  // emitted them somewhere, clean up the fragment.
-  if (!InsertedStrTabFragment)
-    delete StrTabFragment;
-}
-
-/// This is a valid number for use with .cv_loc if we've already seen a .cv_file
-/// for it.
-bool CodeViewContext::isValidFileNumber(unsigned FileNumber) const {
-  unsigned Idx = FileNumber - 1;
-  if (Idx < Filenames.size())
-    return !Filenames[Idx].empty();
-  return false;
-}
-
-bool CodeViewContext::addFile(unsigned FileNumber, StringRef Filename) {
-  assert(FileNumber > 0);
-  Filename = addToStringTable(Filename);
-  unsigned Idx = FileNumber - 1;
-  if (Idx >= Filenames.size())
-    Filenames.resize(Idx + 1);
-
-  if (Filename.empty())
-    Filename = "<stdin>";
-
-  if (!Filenames[Idx].empty())
-    return false;
-
-  // FIXME: We should store the string table offset of the filename, rather than
-  // the filename itself for efficiency.
-  Filename = addToStringTable(Filename);
-
-  Filenames[Idx] = Filename;
-  return true;
-}
-
-MCDataFragment *CodeViewContext::getStringTableFragment() {
-  if (!StrTabFragment) {
-    StrTabFragment = new MCDataFragment();
-    // Start a new string table out with a null byte.
-    StrTabFragment->getContents().push_back('\0');
-  }
-  return StrTabFragment;
-}
-
-StringRef CodeViewContext::addToStringTable(StringRef S) {
-  SmallVectorImpl<char> &Contents = getStringTableFragment()->getContents();
-  auto Insertion =
-      StringTable.insert(std::make_pair(S, unsigned(Contents.size())));
-  // Return the string from the table, since it is stable.
-  S = Insertion.first->first();
-  if (Insertion.second) {
-    // The string map key is always null terminated.
-    Contents.append(S.begin(), S.end() + 1);
-  }
-  return S;
-}
-
-unsigned CodeViewContext::getStringTableOffset(StringRef S) {
-  // A string table offset of zero is always the empty string.
-  if (S.empty())
-    return 0;
-  auto I = StringTable.find(S);
-  assert(I != StringTable.end());
-  return I->second;
-}
-
-void CodeViewContext::emitStringTable(MCObjectStreamer &OS) {
-  MCContext &Ctx = OS.getContext();
-  MCSymbol *StringBegin = Ctx.createTempSymbol("strtab_begin"),
-           *StringEnd = Ctx.createTempSymbol("strtab_end");
-
-  OS.EmitIntValue(unsigned(ModuleSubstreamKind::StringTable), 4);
-  OS.emitAbsoluteSymbolDiff(StringEnd, StringBegin, 4);
-  OS.EmitLabel(StringBegin);
-
-  // Put the string table data fragment here, if we haven't already put it
-  // somewhere else. If somebody wants two string tables in their .s file, one
-  // will just be empty.
-  if (!InsertedStrTabFragment) {
-    OS.insert(getStringTableFragment());
-    InsertedStrTabFragment = true;
-  }
-
-  OS.EmitValueToAlignment(4, 0);
-
-  OS.EmitLabel(StringEnd);
-}
-
-void CodeViewContext::emitFileChecksums(MCObjectStreamer &OS) {
-  MCContext &Ctx = OS.getContext();
-  MCSymbol *FileBegin = Ctx.createTempSymbol("filechecksums_begin"),
-           *FileEnd = Ctx.createTempSymbol("filechecksums_end");
-
-  OS.EmitIntValue(unsigned(ModuleSubstreamKind::FileChecksums), 4);
-  OS.emitAbsoluteSymbolDiff(FileEnd, FileBegin, 4);
-  OS.EmitLabel(FileBegin);
-
-  // Emit an array of FileChecksum entries. We index into this table using the
-  // user-provided file number. Each entry is currently 8 bytes, as we don't
-  // emit checksums.
-  for (StringRef Filename : Filenames) {
-    OS.EmitIntValue(getStringTableOffset(Filename), 4);
-    // Zero the next two fields and align back to 4 bytes. This indicates that
-    // no checksum is present.
-    OS.EmitIntValue(0, 4);
-  }
-
-  OS.EmitLabel(FileEnd);
-}
-
-void CodeViewContext::emitLineTableForFunction(MCObjectStreamer &OS,
-                                               unsigned FuncId,
-                                               const MCSymbol *FuncBegin,
-                                               const MCSymbol *FuncEnd) {
-  MCContext &Ctx = OS.getContext();
-  MCSymbol *LineBegin = Ctx.createTempSymbol("linetable_begin"),
-           *LineEnd = Ctx.createTempSymbol("linetable_end");
-
-  OS.EmitIntValue(unsigned(ModuleSubstreamKind::Lines), 4);
-  OS.emitAbsoluteSymbolDiff(LineEnd, LineBegin, 4);
-  OS.EmitLabel(LineBegin);
-  OS.EmitCOFFSecRel32(FuncBegin);
-  OS.EmitCOFFSectionIndex(FuncBegin);
-
-  // Actual line info.
-  ArrayRef<MCCVLineEntry> Locs = getFunctionLineEntries(FuncId);
-  bool HaveColumns = any_of(Locs, [](const MCCVLineEntry &LineEntry) {
-    return LineEntry.getColumn() != 0;
-  });
-  OS.EmitIntValue(HaveColumns ? int(codeview::LineFlags::HaveColumns) : 0, 2);
-  OS.emitAbsoluteSymbolDiff(FuncEnd, FuncBegin, 4);
-
-  for (auto I = Locs.begin(), E = Locs.end(); I != E;) {
-    // Emit a file segment for the run of locations that share a file id.
-    unsigned CurFileNum = I->getFileNum();
-    auto FileSegEnd =
-        std::find_if(I, E, [CurFileNum](const MCCVLineEntry &Loc) {
-          return Loc.getFileNum() != CurFileNum;
-        });
-    unsigned EntryCount = FileSegEnd - I;
-    OS.AddComment("Segment for file '" + Twine(Filenames[CurFileNum - 1]) +
-                  "' begins");
-    OS.EmitIntValue(8 * (CurFileNum - 1), 4);
-    OS.EmitIntValue(EntryCount, 4);
-    uint32_t SegmentSize = 12;
-    SegmentSize += 8 * EntryCount;
-    if (HaveColumns)
-      SegmentSize += 4 * EntryCount;
-    OS.EmitIntValue(SegmentSize, 4);
-
-    for (auto J = I; J != FileSegEnd; ++J) {
-      OS.emitAbsoluteSymbolDiff(J->getLabel(), FuncBegin, 4);
-      unsigned LineData = J->getLine();
-      if (J->isStmt())
-        LineData |= codeview::LineInfo::StatementFlag;
-      OS.EmitIntValue(LineData, 4);
-    }
-    if (HaveColumns) {
-      for (auto J = I; J != FileSegEnd; ++J) {
-        OS.EmitIntValue(J->getColumn(), 2);
-        OS.EmitIntValue(0, 2);
-      }
-    }
-    I = FileSegEnd;
-  }
-  OS.EmitLabel(LineEnd);
-}
-
-//
-// This is called when an instruction is assembled into the specified section
-// and if there is information from the last .cv_loc directive that has yet to have
-// a line entry made for it is made.
-//
-void MCCVLineEntry::Make(MCObjectStreamer *MCOS) {
-  if (!MCOS->getContext().getCVLocSeen())
-    return;
-
-  // Create a symbol at in the current section for use in the line entry.
-  MCSymbol *LineSym = MCOS->getContext().createTempSymbol();
-  // Set the value of the symbol to use for the MCCVLineEntry.
-  MCOS->EmitLabel(LineSym);
-
-  // Get the current .loc info saved in the context.
-  const MCCVLoc &CVLoc = MCOS->getContext().getCurrentCVLoc();
-
-  // Create a (local) line entry with the symbol and the current .loc info.
-  MCCVLineEntry LineEntry(LineSym, CVLoc);
-
-  // clear CVLocSeen saying the current .loc info is now used.
-  MCOS->getContext().clearCVLocSeen();
-
-  // Add the line entry to this section's entries.
-  MCOS->getContext().getCVContext().addLineEntry(LineEntry);
-}