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| author | Jakub Jelinek <jakub@redhat.com> | 2023-02-02 10:54:54 +0100 |
|---|---|---|
| committer | Jakub Jelinek <jakub@redhat.com> | 2023-02-02 10:54:54 +0100 |
| commit | d2423144eb36a68fd0da9224857ce807714874a7 (patch) | |
| tree | 8e7cf8009eb3608cb87336a6a533f1d121863ba7 /gcc/builtins.cc | |
| parent | 209f02b0a9e9adc0bf0247cb5eef04e0f175d64e (diff) | |
| download | gcc-d2423144eb36a68fd0da9224857ce807714874a7.zip gcc-d2423144eb36a68fd0da9224857ce807714874a7.tar.gz gcc-d2423144eb36a68fd0da9224857ce807714874a7.tar.bz2 | |
Replace IFN_TRAP with BUILT_IN_UNREACHABLE_TRAP [PR107300]
For PR106099 I've added IFN_TRAP as an alternative to __builtin_trap
meant for __builtin_unreachable purposes (e.g. with -funreachable-traps
or some sanitizers) which doesn't need vops because __builtin_unreachable
doesn't need them either. This works in various cases, but unfortunately
IPA likes to decide on the redirection to unreachable just by tweaking
the cgraph edge to point to a different FUNCTION_DECL. As internal
functions don't have a decl, this causes problems like in the following
testcase.
The following patch fixes it by removing IFN_TRAP again and replacing
it with user inaccessible BUILT_IN_UNREACHABLE_TRAP, so that e.g.
builtin_decl_unreachable can return it directly and we don't need to tweak
it later in wherever we actually replace the call stmt.
2023-02-02 Jakub Jelinek <jakub@redhat.com>
PR ipa/107300
* builtins.def (BUILT_IN_UNREACHABLE_TRAP): New builtin.
* internal-fn.def (TRAP): Remove.
* internal-fn.cc (expand_TRAP): Remove.
* tree.cc (build_common_builtin_nodes): Define
BUILT_IN_UNREACHABLE_TRAP if not yet defined.
(builtin_decl_unreachable): Use BUILT_IN_UNREACHABLE_TRAP
instead of BUILT_IN_TRAP.
* gimple.cc (gimple_build_builtin_unreachable): Remove
emitting internal function for BUILT_IN_TRAP.
* asan.cc (maybe_instrument_call): Handle BUILT_IN_UNREACHABLE_TRAP.
* cgraph.cc (cgraph_edge::verify_corresponds_to_fndecl): Handle
BUILT_IN_UNREACHABLE_TRAP instead of BUILT_IN_TRAP.
* ipa-devirt.cc (possible_polymorphic_call_target_p): Handle
BUILT_IN_UNREACHABLE_TRAP.
* builtins.cc (expand_builtin, is_inexpensive_builtin): Likewise.
* tree-cfg.cc (verify_gimple_call,
pass_warn_function_return::execute): Likewise.
* attribs.cc (decl_attributes): Don't report exclusions on
BUILT_IN_UNREACHABLE_TRAP either.
* gcc.dg/pr107300.c: New test.
Diffstat (limited to 'gcc/builtins.cc')
| -rw-r--r-- | gcc/builtins.cc | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/gcc/builtins.cc b/gcc/builtins.cc index af45829..8327bcb 100644 --- a/gcc/builtins.cc +++ b/gcc/builtins.cc @@ -7844,6 +7844,7 @@ expand_builtin (tree exp, rtx target, rtx subtarget, machine_mode mode, break; case BUILT_IN_TRAP: + case BUILT_IN_UNREACHABLE_TRAP: expand_builtin_trap (); return const0_rtx; @@ -11310,6 +11311,7 @@ is_inexpensive_builtin (tree decl) case BUILT_IN_VA_ARG_PACK_LEN: case BUILT_IN_VA_COPY: case BUILT_IN_TRAP: + case BUILT_IN_UNREACHABLE_TRAP: case BUILT_IN_SAVEREGS: case BUILT_IN_POPCOUNTL: case BUILT_IN_POPCOUNTLL: |