forked from OSchip/llvm-project
bf176c49e8
Many optimizers (e.g. GlobalOpt/ConstantMerge) do not respect linker semantics
for comdat and may not discard the sections as a unit.
The interconnected `__llvm_prf_{cnts,data}` sections (in comdat for ELF)
are similar to D97432: `__profd_` is not directly referenced, so
`__profd_` may be discarded while `__profc_` is retained, breaking the
interconnection. We currently conservatively add all such sections to
`llvm.used` and let the linker do GC for ELF.
In D97448, we will change GlobalObject's in the llvm.used list to use SHF_GNU_RETAIN,
causing the metadata sections to be unnecessarily retained (some `check-profile` tests check for GC).
Use `llvm.compiler.used` to retain the current GC behavior.
Differential Revision: https://reviews.llvm.org/D97585
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|---|---|---|
| .. | ||
| AddressSanitizer.cpp | ||
| BoundsChecking.cpp | ||
| CFGMST.h | ||
| CGProfile.cpp | ||
| CMakeLists.txt | ||
| ControlHeightReduction.cpp | ||
| DataFlowSanitizer.cpp | ||
| GCOVProfiling.cpp | ||
| HWAddressSanitizer.cpp | ||
| IndirectCallPromotion.cpp | ||
| InstrOrderFile.cpp | ||
| InstrProfiling.cpp | ||
| Instrumentation.cpp | ||
| MaximumSpanningTree.h | ||
| MemProfiler.cpp | ||
| MemorySanitizer.cpp | ||
| PGOInstrumentation.cpp | ||
| PGOMemOPSizeOpt.cpp | ||
| PoisonChecking.cpp | ||
| SanitizerCoverage.cpp | ||
| ThreadSanitizer.cpp | ||
| ValueProfileCollector.cpp | ||
| ValueProfileCollector.h | ||
| ValueProfilePlugins.inc | ||