2014-01-30 01:39:17 +00:00
|
|
|
//===-- 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)];
|
2014-04-24 06:44:33 +00:00
|
|
|
if (Result)
|
2014-01-30 01:39:17 +00:00
|
|
|
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 *AP)
|
2014-04-24 06:44:33 +00:00
|
|
|
: Asm(nullptr), CurFn(nullptr) {
|
2014-01-30 01:39:17 +00:00
|
|
|
MachineModuleInfo *MMI = AP->MMI;
|
|
|
|
|
|
|
|
// If module doesn't have named metadata anchors or COFF debug section
|
|
|
|
// is not available, skip any debug info related stuff.
|
|
|
|
if (!MMI->getModule()->getNamedMetadata("llvm.dbg.cu") ||
|
|
|
|
!AP->getObjFileLowering().getCOFFDebugSymbolsSection())
|
|
|
|
return;
|
|
|
|
|
|
|
|
// Tell MMI that we have debug info.
|
|
|
|
MMI->setDebugInfoAvailability(true);
|
|
|
|
Asm = AP;
|
|
|
|
}
|
|
|
|
|
2014-10-10 16:05:32 +00:00
|
|
|
void WinCodeViewLineTables::endModule() {
|
|
|
|
if (FnDebugInfo.empty())
|
|
|
|
return;
|
|
|
|
|
|
|
|
assert(Asm != nullptr);
|
|
|
|
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.
|
|
|
|
|
|
|
|
// Emit per-function debug information. This code is extracted into a
|
|
|
|
// separate function for readability.
|
|
|
|
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 its 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();
|
|
|
|
}
|
|
|
|
|
2014-01-30 01:39:17 +00:00
|
|
|
static void EmitLabelDiff(MCStreamer &Streamer,
|
2014-10-24 01:27:45 +00:00
|
|
|
const MCSymbol *From, const MCSymbol *To,
|
|
|
|
unsigned int Size = 4) {
|
2014-01-30 01:39:17 +00:00
|
|
|
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);
|
2014-10-24 01:27:45 +00:00
|
|
|
Streamer.EmitValue(AddrDelta, Size);
|
2014-01-30 01:39:17 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
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);
|
|
|
|
assert(Fn);
|
2014-03-26 09:50:36 +00:00
|
|
|
|
|
|
|
const FunctionInfo &FI = FnDebugInfo[GV];
|
|
|
|
if (FI.Instrs.empty())
|
|
|
|
return;
|
|
|
|
assert(FI.End && "Don't know where the function ends?");
|
2014-01-30 01:39:17 +00:00
|
|
|
|
2015-03-20 19:50:00 +00:00
|
|
|
StringRef GVName = GV->getName();
|
|
|
|
StringRef FuncName;
|
|
|
|
if (DISubprogram SP = getDISubprogram(GV))
|
|
|
|
FuncName = SP.getDisplayName();
|
|
|
|
|
2014-11-12 20:21:20 +00:00
|
|
|
// FIXME Clang currently sets DisplayName to "bar" for a C++
|
|
|
|
// "namespace_foo::bar" function, see PR21528. Luckily, dbghelp.dll is trying
|
|
|
|
// to demangle display names anyways, so let's just put a mangled name into
|
|
|
|
// the symbols subsection until Clang gives us what we need.
|
|
|
|
if (GVName.startswith("\01?"))
|
|
|
|
FuncName = GVName.substr(1);
|
2014-10-24 01:27:45 +00:00
|
|
|
// Emit a symbol subsection, required by VS2012+ to find function boundaries.
|
|
|
|
MCSymbol *SymbolsBegin = Asm->MMI->getContext().CreateTempSymbol(),
|
|
|
|
*SymbolsEnd = Asm->MMI->getContext().CreateTempSymbol();
|
|
|
|
Asm->OutStreamer.AddComment("Symbol subsection for " + Twine(FuncName));
|
|
|
|
Asm->EmitInt32(COFF::DEBUG_SYMBOL_SUBSECTION);
|
|
|
|
EmitLabelDiff(Asm->OutStreamer, SymbolsBegin, SymbolsEnd);
|
|
|
|
Asm->OutStreamer.EmitLabel(SymbolsBegin);
|
|
|
|
{
|
|
|
|
MCSymbol *ProcSegmentBegin = Asm->MMI->getContext().CreateTempSymbol(),
|
|
|
|
*ProcSegmentEnd = Asm->MMI->getContext().CreateTempSymbol();
|
|
|
|
EmitLabelDiff(Asm->OutStreamer, ProcSegmentBegin, ProcSegmentEnd, 2);
|
|
|
|
Asm->OutStreamer.EmitLabel(ProcSegmentBegin);
|
|
|
|
|
|
|
|
Asm->EmitInt16(COFF::DEBUG_SYMBOL_TYPE_PROC_START);
|
|
|
|
// Some bytes of this segment don't seem to be required for basic debugging,
|
|
|
|
// so just fill them with zeroes.
|
|
|
|
Asm->OutStreamer.EmitFill(12, 0);
|
|
|
|
// This is the important bit that tells the debugger where the function
|
|
|
|
// code is located and what's its size:
|
|
|
|
EmitLabelDiff(Asm->OutStreamer, Fn, FI.End);
|
|
|
|
Asm->OutStreamer.EmitFill(12, 0);
|
|
|
|
Asm->OutStreamer.EmitCOFFSecRel32(Fn);
|
|
|
|
Asm->OutStreamer.EmitCOFFSectionIndex(Fn);
|
|
|
|
Asm->EmitInt8(0);
|
2014-11-12 20:10:09 +00:00
|
|
|
// Emit the function display name as a null-terminated string.
|
2014-10-24 01:27:45 +00:00
|
|
|
Asm->OutStreamer.EmitBytes(FuncName);
|
|
|
|
Asm->EmitInt8(0);
|
|
|
|
Asm->OutStreamer.EmitLabel(ProcSegmentEnd);
|
|
|
|
|
|
|
|
// We're done with this function.
|
|
|
|
Asm->EmitInt16(0x0002);
|
|
|
|
Asm->EmitInt16(COFF::DEBUG_SYMBOL_TYPE_PROC_END);
|
|
|
|
}
|
|
|
|
Asm->OutStreamer.EmitLabel(SymbolsEnd);
|
|
|
|
// Every subsection must be aligned to a 4-byte boundary.
|
|
|
|
Asm->OutStreamer.EmitFill((-FuncName.size()) % 4, 0);
|
|
|
|
|
2014-01-30 01:39:17 +00:00
|
|
|
// 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;
|
|
|
|
|
2014-10-10 16:05:32 +00:00
|
|
|
// Emit a line table subsection, requred to do PC-to-file:line lookup.
|
2014-10-24 01:27:45 +00:00
|
|
|
Asm->OutStreamer.AddComment("Line table subsection for " + Twine(FuncName));
|
2014-01-30 01:39:17 +00:00
|
|
|
Asm->EmitInt32(COFF::DEBUG_LINE_TABLE_SUBSECTION);
|
2014-10-24 01:27:45 +00:00
|
|
|
MCSymbol *LineTableBegin = Asm->MMI->getContext().CreateTempSymbol(),
|
|
|
|
*LineTableEnd = Asm->MMI->getContext().CreateTempSymbol();
|
|
|
|
EmitLabelDiff(Asm->OutStreamer, LineTableBegin, LineTableEnd);
|
|
|
|
Asm->OutStreamer.EmitLabel(LineTableBegin);
|
2014-01-30 01:39:17 +00:00
|
|
|
|
|
|
|
// Identify the function this subsection is for.
|
|
|
|
Asm->OutStreamer.EmitCOFFSecRel32(Fn);
|
|
|
|
Asm->OutStreamer.EmitCOFFSectionIndex(Fn);
|
2014-10-08 18:01:49 +00:00
|
|
|
// Insert padding after a 16-bit section index.
|
|
|
|
Asm->EmitInt16(0);
|
2014-01-30 01:39:17 +00:00
|
|
|
|
|
|
|
// Length of the function's code, in bytes.
|
|
|
|
EmitLabelDiff(Asm->OutStreamer, Fn, FI.End);
|
|
|
|
|
|
|
|
// PC-to-linenumber lookup table:
|
2014-04-24 06:44:33 +00:00
|
|
|
MCSymbol *FileSegmentEnd = nullptr;
|
2014-01-30 01:39:17 +00:00
|
|
|
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);
|
2014-10-24 01:27:45 +00:00
|
|
|
Asm->OutStreamer.EmitLabel(LineTableEnd);
|
2014-01-30 01:39:17 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
void WinCodeViewLineTables::beginFunction(const MachineFunction *MF) {
|
|
|
|
assert(!CurFn && "Can't process two functions at once!");
|
|
|
|
|
|
|
|
if (!Asm || !Asm->MMI->hasDebugInfo())
|
|
|
|
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;
|
2014-04-30 22:17:38 +00:00
|
|
|
for (const auto &MBB : *MF) {
|
|
|
|
if (!PrologEndLoc.isUnknown())
|
|
|
|
break;
|
|
|
|
for (const auto &MI : MBB) {
|
|
|
|
if (MI.isDebugValue())
|
2014-01-30 01:39:17 +00:00
|
|
|
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?
|
2014-04-30 22:17:38 +00:00
|
|
|
if (!MI.getFlag(MachineInstr::FrameSetup) &&
|
|
|
|
(!MI.getDebugLoc().isUnknown())) {
|
|
|
|
PrologEndLoc = MI.getDebugLoc();
|
2014-01-30 01:39:17 +00:00
|
|
|
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);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2014-03-26 11:24:36 +00:00
|
|
|
void WinCodeViewLineTables::endFunction(const MachineFunction *MF) {
|
2014-01-30 01:39:17 +00:00
|
|
|
if (!Asm || !CurFn) // We haven't created any debug info for this function.
|
|
|
|
return;
|
|
|
|
|
2014-03-26 11:24:36 +00:00
|
|
|
const Function *GV = MF->getFunction();
|
2014-06-20 10:26:56 +00:00
|
|
|
assert(FnDebugInfo.count(GV));
|
2014-03-26 11:24:36 +00:00
|
|
|
assert(CurFn == &FnDebugInfo[GV]);
|
|
|
|
|
|
|
|
if (CurFn->Instrs.empty()) {
|
|
|
|
FnDebugInfo.erase(GV);
|
|
|
|
VisitedFunctions.pop_back();
|
|
|
|
} else {
|
2015-03-05 02:05:42 +00:00
|
|
|
CurFn->End = Asm->getFunctionEnd();
|
2014-03-26 09:50:36 +00:00
|
|
|
}
|
2014-04-24 06:44:33 +00:00
|
|
|
CurFn = nullptr;
|
2014-01-30 01:39:17 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
void WinCodeViewLineTables::beginInstruction(const MachineInstr *MI) {
|
|
|
|
// Ignore DBG_VALUE locations and function prologue.
|
|
|
|
if (!Asm || MI->isDebugValue() || MI->getFlag(MachineInstr::FrameSetup))
|
|
|
|
return;
|
|
|
|
DebugLoc DL = MI->getDebugLoc();
|
|
|
|
if (DL == PrevInstLoc || DL.isUnknown())
|
|
|
|
return;
|
|
|
|
maybeRecordLocation(DL, Asm->MF);
|
|
|
|
}
|
|
|
|
}
|