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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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| .. | ||
| AArch64 | ||
| Mips | ||
| PowerPC | ||
| SystemZ | ||
| X86 | ||
| abs-vector.ll | ||
| alloca.ll | ||
| array_types.ll | ||
| atomics.ll | ||
| attributes.ll | ||
| bmi.ll | ||
| byval-alignment.ll | ||
| check_access_address.ll | ||
| check-array.ll | ||
| check-constant-shadow.ll | ||
| check-struct.ll | ||
| clmul.ll | ||
| csr.ll | ||
| freeze.ll | ||
| instrumentation-with-call-threshold.ll | ||
| libatomic.ll | ||
| manual-shadow.ll | ||
| masked-store-load.ll | ||
| missing_origin.ll | ||
| msan_asm_conservative.ll | ||
| msan_basic.ll | ||
| msan_eager.ll | ||
| msan_kernel_basic.ll | ||
| msan_llvm_is_constant.ll | ||
| msan_llvm_launder_invariant.ll | ||
| msan_llvm_strip_invariant.ll | ||
| msan_x86_bts_asm.ll | ||
| msan_x86intrinsics.ll | ||
| mul_by_constant.ll | ||
| no-check-rt-unaligned.ll | ||
| nosanitize.ll | ||
| origin-alignment.ll | ||
| origin-array.ll | ||
| pr32842.ll | ||
| reduce.ll | ||
| return_from_main.ll | ||
| store-long-origin.ll | ||
| store-origin.ll | ||
| str-nobuiltin.ll | ||
| unreachable.ll | ||
| unsized_type.ll | ||
| vector_arith.ll | ||
| vector_cmp.ll | ||
| vector_cvt.ll | ||
| vector_pack.ll | ||
| vector_shift.ll | ||
| with-call-type-size.ll | ||