forked from OSchip/llvm-project
Re-land "[codeview] Emit information about global variables"
This reverts commit r271962 and reinstantes r271957. MSVC's linker doesn't appear to like it if you have an empty symbol substream, so only open a symbol substream if we're going to emit something about globals into it. Makes check-asan pass. llvm-svn: 271965
This commit is contained in:
Reid Kleckner
parent
4ece163c92
commit
6f3406df67
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@ -232,7 +232,7 @@ void CodeViewDebug::emitCodeViewMagicVersion() {
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}
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void CodeViewDebug::endModule() {
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if (FnDebugInfo.empty())
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if (!Asm || !MMI->hasDebugInfo())
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return;
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assert(Asm != nullptr);
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@ -242,13 +242,18 @@ void CodeViewDebug::endModule() {
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// of the payload followed by the payload itself. The subsections are 4-byte
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// aligned.
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// Make a subsection for all the inlined subprograms.
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// Use the generic .debug$S section, and make a subsection for all the inlined
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// subprograms.
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switchToDebugSectionForSymbol(nullptr);
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emitInlineeLinesSubsection();
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// Emit per-function debug information.
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for (auto &P : FnDebugInfo)
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emitDebugInfoForFunction(P.first, P.second);
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// Emit global variable debug information.
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emitDebugInfoForGlobals();
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// Switch back to the generic .debug$S section after potentially processing
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// comdat symbol sections.
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switchToDebugSectionForSymbol(nullptr);
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@ -326,17 +331,9 @@ void CodeViewDebug::emitInlineeLinesSubsection() {
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if (InlinedSubprograms.empty())
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return;
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// Use the generic .debug$S section.
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switchToDebugSectionForSymbol(nullptr);
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MCSymbol *InlineBegin = MMI->getContext().createTempSymbol(),
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*InlineEnd = MMI->getContext().createTempSymbol();
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OS.AddComment("Inlinee lines subsection");
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OS.EmitIntValue(unsigned(ModuleSubstreamKind::InlineeLines), 4);
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OS.AddComment("Subsection size");
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OS.emitAbsoluteSymbolDiff(InlineEnd, InlineBegin, 4);
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OS.EmitLabel(InlineBegin);
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MCSymbol *InlineEnd = beginCVSubsection(ModuleSubstreamKind::InlineeLines);
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// We don't provide any extra file info.
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// FIXME: Find out if debuggers use this info.
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@ -363,7 +360,7 @@ void CodeViewDebug::emitInlineeLinesSubsection() {
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OS.EmitIntValue(SP->getLine(), 4);
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}
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OS.EmitLabel(InlineEnd);
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endCVSubsection(InlineEnd);
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}
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void CodeViewDebug::collectInlineSiteChildren(
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@ -467,13 +464,8 @@ void CodeViewDebug::emitDebugInfoForFunction(const Function *GV,
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FuncName = GlobalValue::getRealLinkageName(GV->getName());
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// Emit a symbol subsection, required by VS2012+ to find function boundaries.
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MCSymbol *SymbolsBegin = MMI->getContext().createTempSymbol(),
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*SymbolsEnd = MMI->getContext().createTempSymbol();
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OS.AddComment("Symbol subsection for " + Twine(FuncName));
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OS.EmitIntValue(unsigned(ModuleSubstreamKind::Symbols), 4);
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OS.AddComment("Subsection size");
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OS.emitAbsoluteSymbolDiff(SymbolsEnd, SymbolsBegin, 4);
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OS.EmitLabel(SymbolsBegin);
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MCSymbol *SymbolsEnd = beginCVSubsection(ModuleSubstreamKind::Symbols);
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{
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MCSymbol *ProcRecordBegin = MMI->getContext().createTempSymbol(),
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*ProcRecordEnd = MMI->getContext().createTempSymbol();
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@ -532,9 +524,7 @@ void CodeViewDebug::emitDebugInfoForFunction(const Function *GV,
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OS.AddComment("Record kind: S_PROC_ID_END");
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OS.EmitIntValue(unsigned(SymbolKind::S_PROC_ID_END), 2);
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}
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OS.EmitLabel(SymbolsEnd);
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// Every subsection must be aligned to a 4-byte boundary.
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OS.EmitValueToAlignment(4);
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endCVSubsection(SymbolsEnd);
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// We have an assembler directive that takes care of the whole line table.
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OS.EmitCVLinetableDirective(FI.FuncId, Fn, FI.End);
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@ -1272,3 +1262,82 @@ void CodeViewDebug::beginInstruction(const MachineInstr *MI) {
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return;
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maybeRecordLocation(DL, Asm->MF);
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}
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MCSymbol *CodeViewDebug::beginCVSubsection(ModuleSubstreamKind Kind) {
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MCSymbol *BeginLabel = MMI->getContext().createTempSymbol(),
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*EndLabel = MMI->getContext().createTempSymbol();
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OS.EmitIntValue(unsigned(Kind), 4);
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OS.AddComment("Subsection size");
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OS.emitAbsoluteSymbolDiff(EndLabel, BeginLabel, 4);
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OS.EmitLabel(BeginLabel);
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return EndLabel;
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}
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void CodeViewDebug::endCVSubsection(MCSymbol *EndLabel) {
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OS.EmitLabel(EndLabel);
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// Every subsection must be aligned to a 4-byte boundary.
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OS.EmitValueToAlignment(4);
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}
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void CodeViewDebug::emitDebugInfoForGlobals() {
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NamedMDNode *CUs = MMI->getModule()->getNamedMetadata("llvm.dbg.cu");
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for (const MDNode *Node : CUs->operands()) {
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const auto *CU = cast<DICompileUnit>(Node);
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// First, emit all globals that are not in a comdat in a single symbol
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// substream. MSVC doesn't like it if the substream is empty, so only open
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// it if we have at least one global to emit.
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switchToDebugSectionForSymbol(nullptr);
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MCSymbol *EndLabel = nullptr;
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for (const DIGlobalVariable *G : CU->getGlobalVariables()) {
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if (const auto *GV = dyn_cast<GlobalVariable>(G->getVariable()))
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if (!GV->hasComdat()) {
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if (!EndLabel) {
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OS.AddComment("Symbol subsection for globals");
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EndLabel = beginCVSubsection(ModuleSubstreamKind::Symbols);
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}
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emitDebugInfoForGlobal(G, Asm->getSymbol(GV));
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}
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}
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if (EndLabel)
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endCVSubsection(EndLabel);
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// Second, emit each global that is in a comdat into its own .debug$S
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// section along with its own symbol substream.
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for (const DIGlobalVariable *G : CU->getGlobalVariables()) {
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if (const auto *GV = dyn_cast<GlobalVariable>(G->getVariable())) {
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if (GV->hasComdat()) {
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MCSymbol *GVSym = Asm->getSymbol(GV);
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OS.AddComment("Symbol subsection for " +
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Twine(GlobalValue::getRealLinkageName(GV->getName())));
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switchToDebugSectionForSymbol(GVSym);
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EndLabel = beginCVSubsection(ModuleSubstreamKind::Symbols);
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emitDebugInfoForGlobal(G, GVSym);
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endCVSubsection(EndLabel);
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}
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}
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}
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}
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}
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void CodeViewDebug::emitDebugInfoForGlobal(const DIGlobalVariable *DIGV,
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MCSymbol *GVSym) {
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// DataSym record, see SymbolRecord.h for more info.
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// FIXME: Thread local data, etc
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MCSymbol *DataBegin = MMI->getContext().createTempSymbol(),
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*DataEnd = MMI->getContext().createTempSymbol();
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OS.AddComment("Record length");
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OS.emitAbsoluteSymbolDiff(DataEnd, DataBegin, 2);
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OS.EmitLabel(DataBegin);
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OS.AddComment("Record kind: S_GDATA32");
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OS.EmitIntValue(unsigned(SymbolKind::S_GDATA32), 2);
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OS.AddComment("Type");
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OS.EmitIntValue(getCompleteTypeIndex(DIGV->getType()).getIndex(), 4);
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OS.AddComment("DataOffset");
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OS.EmitCOFFSecRel32(GVSym);
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OS.AddComment("Segment");
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OS.EmitCOFFSectionIndex(GVSym);
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OS.AddComment("Name");
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emitNullTerminatedSymbolName(OS, DIGV->getName());
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OS.EmitLabel(DataEnd);
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}
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@ -169,6 +169,17 @@ class LLVM_LIBRARY_VISIBILITY CodeViewDebug : public DebugHandlerBase {
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void emitDebugInfoForFunction(const Function *GV, FunctionInfo &FI);
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void emitDebugInfoForGlobals();
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void emitDebugInfoForGlobal(const DIGlobalVariable *DIGV, MCSymbol *GVSym);
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/// Opens a subsection of the given kind in a .debug$S codeview section.
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/// Returns an end label for use with endCVSubsection when the subsection is
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/// finished.
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MCSymbol *beginCVSubsection(codeview::ModuleSubstreamKind Kind);
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void endCVSubsection(MCSymbol *EndLabel);
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void emitInlinedCallSite(const FunctionInfo &FI, const DILocation *InlinedAt,
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const InlineSite &Site);
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@ -0,0 +1,146 @@
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; RUN: llc < %s | FileCheck %s --check-prefix=ASM
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; RUN: llc < %s -filetype=obj | llvm-readobj - -codeview | FileCheck %s --check-prefix=OBJ
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; C++ source to regenerate:
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; $ cat t.cpp
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; int first;
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; template <typename T> struct A { static const int comdat = 3; };
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; const int *middle = &A<void>::comdat;
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; int last;
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; $ clang t.cpp -S -emit-llvm -g -gcodeview -o t.ll
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; ASM: .section .debug$S,"dr"
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; ASM: .p2align 2
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; ASM: .long 4 # Debug section magic
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; ASM: .short {{.*-.*}} # Record length
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; ASM: .short 4365 # Record kind: S_GDATA32
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; ASM: .long 116 # Type
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; ASM: .secrel32 "?first@@3HA" # DataOffset
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; ASM: .secidx "?first@@3HA" # Segment
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; ASM: .asciz "first" # Name
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; ASM: .short {{.*-.*}} # Record length
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; ASM: .short 4365 # Record kind: S_GDATA32
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; ASM: .long 4097 # Type
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; ASM: .secrel32 "?middle@@3PEBHEB" # DataOffset
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; ASM: .secidx "?middle@@3PEBHEB" # Segment
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; ASM: .asciz "middle" # Name
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; ASM: .short {{.*-.*}} # Record length
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; ASM: .short 4365 # Record kind: S_GDATA32
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; ASM: .long 116 # Type
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; ASM: .secrel32 "?last@@3HA" # DataOffset
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; ASM: .secidx "?last@@3HA" # Segment
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; ASM: .asciz "last" # Name
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; ASM: .section .debug$S,"dr",associative,"?comdat@?$A@X@@2HB"
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; ASM: .p2align 2
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; ASM: .long 4 # Debug section magic
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; ASM: .short {{.*-.*}} # Record length
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; ASM: .short 4365 # Record kind: S_GDATA32
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; ASM: .long 4096 # Type
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; ASM: .secrel32 "?comdat@?$A@X@@2HB" # DataOffset
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; ASM: .secidx "?comdat@?$A@X@@2HB" # Segment
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; ASM: .asciz "comdat" # Name
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; OBJ: CodeViewTypes [
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; OBJ: Section: .debug$T
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; OBJ: Magic: 0x4
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; OBJ: Modifier (0x1000) {
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; OBJ: TypeLeafKind: LF_MODIFIER (0x1001)
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; OBJ: ModifiedType: int (0x74)
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; OBJ: Modifiers [ (0x1)
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; OBJ: Const (0x1)
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; OBJ: ]
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; OBJ: }
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; OBJ: Pointer (0x1001) {
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; OBJ: TypeLeafKind: LF_POINTER (0x1002)
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; OBJ: PointeeType: const int (0x1000)
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; OBJ: PointerAttributes: 0x1000C
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; OBJ: PtrType: Near64 (0xC)
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; OBJ: PtrMode: Pointer (0x0)
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; OBJ: IsFlat: 0
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; OBJ: IsConst: 0
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; OBJ: IsVolatile: 0
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; OBJ: IsUnaligned: 0
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; OBJ: }
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; OBJ: ]
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; OBJ: CodeViewDebugInfo [
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; OBJ: Section: .debug$S
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; OBJ: Magic: 0x4
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; OBJ: Subsection [
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; OBJ: SubSectionType: Symbols (0xF1)
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; OBJ: DataSym {
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; OBJ: DataOffset: ?first@@3HA+0x0
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; OBJ: Type: int (0x74)
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; OBJ: DisplayName: first
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; OBJ: LinkageName: ?first@@3HA
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; OBJ: }
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; OBJ: DataSym {
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; OBJ: DataOffset: ?middle@@3PEBHEB+0x0
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; OBJ: Type: const int* (0x1001)
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; OBJ: DisplayName: middle
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; OBJ: LinkageName: ?middle@@3PEBHEB
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; OBJ: }
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; OBJ: DataSym {
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; OBJ: DataOffset: ?last@@3HA+0x0
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; OBJ: Type: int (0x74)
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; OBJ: DisplayName: last
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; OBJ: LinkageName: ?last@@3HA
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; OBJ: }
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; OBJ: ]
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; OBJ: ]
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; OBJ: CodeViewDebugInfo [
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; OBJ: Section: .debug$S (6)
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; OBJ: Magic: 0x4
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; OBJ: Subsection [
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; OBJ: SubSectionType: Symbols (0xF1)
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; OBJ: SubSectionSize: 0x15
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; OBJ: DataSym {
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; OBJ: DataOffset: ?comdat@?$A@X@@2HB+0x0
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; OBJ: Type: const int (0x1000)
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; OBJ: DisplayName: comdat
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; OBJ: LinkageName: ?comdat@?$A@X@@2HB
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; OBJ: }
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; OBJ: ]
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; OBJ: ]
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; ModuleID = 't.cpp'
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source_filename = "t.cpp"
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target datalayout = "e-m:w-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-pc-windows-msvc19.0.23918"
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$"\01?comdat@?$A@X@@2HB" = comdat any
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@"\01?first@@3HA" = global i32 0, align 4
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@"\01?comdat@?$A@X@@2HB" = linkonce_odr constant i32 3, comdat, align 4
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@"\01?middle@@3PEBHEB" = global i32* @"\01?comdat@?$A@X@@2HB", align 8
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@"\01?last@@3HA" = global i32 0, align 4
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!16, !17, !18}
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!llvm.ident = !{!19}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 3.9.0 (trunk 271937)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, globals: !3)
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!1 = !DIFile(filename: "t.cpp", directory: "D:\5Csrc\5Cllvm\5Cbuild")
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!2 = !{}
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!3 = !{!4, !6, !13, !15}
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!4 = distinct !DIGlobalVariable(name: "first", linkageName: "\01?first@@3HA", scope: !0, file: !1, line: 1, type: !5, isLocal: false, isDefinition: true, variable: i32* @"\01?first@@3HA")
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!5 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!6 = distinct !DIGlobalVariable(name: "comdat", linkageName: "\01?comdat@?$A@X@@2HB", scope: !0, file: !1, line: 2, type: !7, isLocal: false, isDefinition: true, variable: i32* @"\01?comdat@?$A@X@@2HB", declaration: !8)
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!7 = !DIDerivedType(tag: DW_TAG_const_type, baseType: !5)
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!8 = !DIDerivedType(tag: DW_TAG_member, name: "comdat", scope: !9, file: !1, line: 2, baseType: !7, flags: DIFlagStaticMember, extraData: i32 3)
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!9 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "A<void>", file: !1, line: 2, size: 8, align: 8, elements: !10, templateParams: !11)
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!10 = !{!8}
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!11 = !{!12}
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!12 = !DITemplateTypeParameter(name: "T", type: null)
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!13 = distinct !DIGlobalVariable(name: "middle", linkageName: "\01?middle@@3PEBHEB", scope: !0, file: !1, line: 3, type: !14, isLocal: false, isDefinition: true, variable: i32** @"\01?middle@@3PEBHEB")
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!14 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !7, size: 64, align: 64)
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!15 = distinct !DIGlobalVariable(name: "last", linkageName: "\01?last@@3HA", scope: !0, file: !1, line: 4, type: !5, isLocal: false, isDefinition: true, variable: i32* @"\01?last@@3HA")
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!16 = !{i32 2, !"CodeView", i32 1}
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!17 = !{i32 2, !"Debug Info Version", i32 3}
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!18 = !{i32 1, !"PIC Level", i32 2}
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!19 = !{!"clang version 3.9.0 (trunk 271937)"}
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