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On ELF targets, if a function has uwtable or personality, or does not have nounwind (`needsUnwindTableEntry`), it marks that `.eh_frame` is needed in the module. Then, a function gets `.eh_frame` if `needsUnwindTableEntry` or `-g[123]` is specified. (i.e. If -g[123], every function gets `.eh_frame`. This behavior is strange but that is the status quo on GCC and Clang.) Let's take asan as an example. Other sanitizers are similar. `asan.module_[cd]tor` has no attribute. `needsUnwindTableEntry` returns true, so every function gets `.eh_frame` if `-g[123]` is specified. This is the root cause that `-fno-exceptions -fno-asynchronous-unwind-tables -g` produces .debug_frame while `-fno-exceptions -fno-asynchronous-unwind-tables -g -fsanitize=address` produces .eh_frame. This patch * sets the nounwind attribute on sanitizer module ctor/dtor. * let Clang emit a module flag metadata "uwtable" for -fasynchronous-unwind-tables. If "uwtable" is set, sanitizer module ctor/dtor additionally get the uwtable attribute. The "uwtable" mechanism is generic: synthesized functions not cloned/specialized from existing ones should consider `Function::createWithDefaultAttr` instead of `Function::create` if they want to get some default attributes which have more of module semantics. Other candidates: "frame-pointer" (https://github.com/ClangBuiltLinux/linux/issues/955 https://github.com/ClangBuiltLinux/linux/issues/1238), dso_local, etc. Differential Revision: https://reviews.llvm.org/D100251 |
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| .. | ||
| abort-in-entry-block.ll | ||
| backedge-pruning.ll | ||
| chains.ll | ||
| cmp-tracing-api-x86_32.ll | ||
| cmp-tracing-api-x86_64.ll | ||
| cmp-tracing.ll | ||
| coff-comdat.ll | ||
| coff-pc-table-inline-8bit-counters.ll | ||
| coff-pc-table-inline-bool-flag.ll | ||
| coff-used-ctor.ll | ||
| const-cmp-tracing.ll | ||
| coverage2-dbg.ll | ||
| coverage-dbg.ll | ||
| coverage.ll | ||
| crit-edge-sancov.ll | ||
| div-tracing.ll | ||
| gep-tracing.ll | ||
| inline-8bit-counters.ll | ||
| inline-bool-flag.ll | ||
| interposable-symbol.ll | ||
| no-func.ll | ||
| pc-table.ll | ||
| postdominator_check.ll | ||
| seh.ll | ||
| stack-depth-variable-declared-by-user.ll | ||
| stack-depth.ll | ||
| switch-tracing.ll | ||
| trace-pc-guard-inline-8bit-counters.ll | ||
| trace-pc-guard-inline-bool-flag.ll | ||
| trace-pc-guard.ll | ||
| tracing-comdat.ll | ||
| tracing.ll | ||
| unreachable-critedge.ll | ||
| wineh.ll | ||