Messages in this thread Patch in this message | | | Date | Fri, 27 Sep 2019 14:10:05 -0700 | Subject | [PATCH] perf tools: avoid sample_reg_masks being const + weak | From | Ian Rogers <> |
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Being const + weak breaks with some compilers that constant-propagate from the weak symbol. This behavior is outside of the specification, but in LLVM is chosen to match GCC's behavior.
LLVM's implementation was set in this patch: https://github.com/llvm/llvm-project/commit/f49573d1eedcf1e44893d5a062ac1b72c8419646 A const + weak symbol is set to be weak_odr: https://llvm.org/docs/LangRef.html ODR is one definition rule, and given there is one constant definition constant-propagation is possible. It is possible to get this code to miscompile with LLVM when applying link time optimization. As compilers become more aggressive, this is likely to break in more instances.
Move the definition of sample_reg_masks to the conditional part of perf_regs.h and guard usage with HAVE_PERF_REGS_SUPPORT. This avoids the weak symbol.
Signed-off-by: Ian Rogers <irogers@google.com> --- tools/perf/util/parse-regs-options.c | 4 ++++ tools/perf/util/perf_regs.c | 4 ---- tools/perf/util/perf_regs.h | 4 ++-- 3 files changed, 6 insertions(+), 6 deletions(-)
diff --git a/tools/perf/util/parse-regs-options.c b/tools/perf/util/parse-regs-options.c index ef46c2848808..a6a776597df8 100644 --- a/tools/perf/util/parse-regs-options.c +++ b/tools/perf/util/parse-regs-options.c @@ -46,18 +46,22 @@ __parse_regs(const struct option *opt, const char *str, int unset, bool intr) if (!strcmp(s, "?")) { fprintf(stderr, "available registers: "); +#ifdef HAVE_PERF_REGS_SUPPORT for (r = sample_reg_masks; r->name; r++) { if (r->mask & mask) fprintf(stderr, "%s ", r->name); } +#endif fputc('\n', stderr); /* just printing available regs */ return -1; } +#ifdef HAVE_PERF_REGS_SUPPORT for (r = sample_reg_masks; r->name; r++) { if ((r->mask & mask) && !strcasecmp(s, r->name)) break; } +#endif if (!r->name) { ui__warning("Unknown register \"%s\", check man page or run \"perf record %s?\"\n", s, intr ? "-I" : "--user-regs="); diff --git a/tools/perf/util/perf_regs.c b/tools/perf/util/perf_regs.c index 2774cec1f15f..5ee47ae1509c 100644 --- a/tools/perf/util/perf_regs.c +++ b/tools/perf/util/perf_regs.c @@ -3,10 +3,6 @@ #include "perf_regs.h" #include "event.h" -const struct sample_reg __weak sample_reg_masks[] = { - SMPL_REG_END -}; - int __weak arch_sdt_arg_parse_op(char *old_op __maybe_unused, char **new_op __maybe_unused) { diff --git a/tools/perf/util/perf_regs.h b/tools/perf/util/perf_regs.h index 47fe34e5f7d5..e014c2c038f4 100644 --- a/tools/perf/util/perf_regs.h +++ b/tools/perf/util/perf_regs.h @@ -15,8 +15,6 @@ struct sample_reg { #define SMPL_REG2(n, b) { .name = #n, .mask = 3ULL << (b) } #define SMPL_REG_END { .name = NULL } -extern const struct sample_reg sample_reg_masks[]; - enum { SDT_ARG_VALID = 0, SDT_ARG_SKIP, @@ -27,6 +25,8 @@ uint64_t arch__intr_reg_mask(void); uint64_t arch__user_reg_mask(void); #ifdef HAVE_PERF_REGS_SUPPORT +extern const struct sample_reg sample_reg_masks[]; + #include <perf_regs.h> #define DWARF_MINIMAL_REGS ((1ULL << PERF_REG_IP) | (1ULL << PERF_REG_SP)) -- 2.23.0.444.g18eeb5a265-goog
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