[DEBUGINFO] Disable emission of the dwarf sections, but allow directives.
Summary:
Added an option that allows to emit only '.loc' and '.file' kind debug
directives, but disables emission of the DWARF sections. Required for
NVPTX target to support profiling. It requires '.loc' and '.file'
directives, but does not require any DWARF sections for the profiler.
Reviewers: probinson, echristo, dblaikie
Subscribers: aprantl, JDevlieghere, llvm-commits
Differential Revision: https://reviews.llvm.org/D46021
llvm-svn: 338616
diff --git a/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp b/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
index 500e7a0..549bf74 100644
--- a/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
@@ -768,6 +768,8 @@
// all other generation.
for (const auto &P : CUMap) {
auto &TheCU = *P.second;
+ if (TheCU.getCUNode()->isDebugDirectivesOnly())
+ continue;
// Emit DW_AT_containing_type attribute to connect types with their
// vtable holding type.
TheCU.constructContainingTypeDIEs();
@@ -1416,6 +1418,11 @@
LexicalScope *FnScope = LScopes.getCurrentFunctionScope();
assert(!FnScope || SP == FnScope->getScopeNode());
DwarfCompileUnit &TheCU = *CUMap.lookup(SP->getUnit());
+ if (TheCU.getCUNode()->isDebugDirectivesOnly()) {
+ PrevLabel = nullptr;
+ CurFn = nullptr;
+ return;
+ }
DenseSet<InlinedVariable> ProcessedVars;
collectVariableInfo(TheCU, SP, ProcessedVars);
@@ -2132,6 +2139,13 @@
});
};
+ if (llvm::all_of(CUMap, [](const decltype(CUMap)::value_type &Pair) {
+ return Pair.second->getCUNode()->isDebugDirectivesOnly();
+ })) {
+ assert(NoRangesPresent() && "No debug ranges expected.");
+ return;
+ }
+
if (!useRangesSection()) {
assert(NoRangesPresent() && "No debug ranges expected.");
return;
@@ -2154,6 +2168,8 @@
// Grab the specific ranges for the compile units in the module.
for (const auto &I : CUMap) {
DwarfCompileUnit *TheCU = I.second;
+ if (TheCU->getCUNode()->isDebugDirectivesOnly())
+ continue;
if (auto *Skel = TheCU->getSkeleton())
TheCU = Skel;
@@ -2206,12 +2222,19 @@
if (CUMap.empty())
return;
+ if (llvm::all_of(CUMap, [](const decltype(CUMap)::value_type &Pair) {
+ return Pair.second->getCUNode()->isDebugDirectivesOnly();
+ }))
+ return;
+
// Start the dwarf macinfo section.
Asm->OutStreamer->SwitchSection(
Asm->getObjFileLowering().getDwarfMacinfoSection());
for (const auto &P : CUMap) {
auto &TheCU = *P.second;
+ if (TheCU.getCUNode()->isDebugDirectivesOnly())
+ continue;
auto *SkCU = TheCU.getSkeleton();
DwarfCompileUnit &U = SkCU ? *SkCU : TheCU;
auto *CUNode = cast<DICompileUnit>(P.first);