Fix static analysis warnings.

Newly reported warnings included several reserved macro identifier, and
false-positive used-uninitialized.

scripts/run_static_analysis.sh

@@ -53,7 +53,8 @@ CC_ANALYZERS_FROM_PATH=1 CodeChecker analyze compile_commands.json --jobs "$(npr
 	--ctu --compile-uniqueing strict --output static_analysis_raw_results \
 	--analyzers clangsa clang-tidy --skip "$skipfile" \
 	--enable readability-inconsistent-declaration-parameter-name \
-	--enable performance-no-int-to-ptr
+	--enable performance-no-int-to-ptr \
+	--disable clang-diagnostic-reserved-macro-identifier
 	# `--enable` is additive, the vast majority of the checks we want are
 	# enabled by default.
 

src/arena.c

@@ -473,7 +473,7 @@ arena_decay_impl(tsdn_t *tsdn, arena_t *arena, decay_t *decay,
 	    arena_decide_unforced_purge_eagerness(is_background_thread);
 	bool epoch_advanced = pac_maybe_decay_purge(tsdn, &arena->pa_shard.pac,
 	    decay, decay_stats, ecache, eagerness);
-	size_t npages_new;
+	size_t npages_new JEMALLOC_CLANG_ANALYZER_SILENCE_INIT(0);
 	if (epoch_advanced) {
 		/* Backlog is updated on epoch advance. */
 		npages_new = decay_epoch_npages_delta(decay);

src/ctl.c

@@ -3165,7 +3165,7 @@ arena_i_name_ctl(tsd_t *tsd, const size_t *mib, size_t miblen,
     void *oldp, size_t *oldlenp, void *newp, size_t newlen) {
 	int ret;
 	unsigned arena_ind;
-	char *name;
+	char *name JEMALLOC_CLANG_ANALYZER_SILENCE_INIT(NULL);
 
 	malloc_mutex_lock(tsd_tsdn(tsd), &ctl_mtx);
 	MIB_UNSIGNED(arena_ind, 1);

src/tcache.c

@@ -1208,7 +1208,7 @@ thread_tcache_max_set(tsd_t *tsd, size_t tcache_max) {
 	assert(tcache != NULL && tcache_slow != NULL);
 
 	bool enabled = tcache_available(tsd);
-	arena_t *assigned_arena;
+	arena_t *assigned_arena JEMALLOC_CLANG_ANALYZER_SILENCE_INIT(NULL);
 	if (enabled) {
 		assigned_arena = tcache_slow->arena;
 		/* Carry over the bin settings during the reboot. */