Revert "Avoid NULL check in free() and malloc_usable_size()."

This reverts commit 96d4120ac0.

ivsalloc() depends on chunks_rtree being initialized.  This can be
worked around via a NULL pointer check.  However,
thread_allocated_tsd_get() also depends on initialization having
occurred, and there is no way to guard its call in free() that is
cheaper than checking whether ptr is NULL.

Makefile.in

@@ -65,7 +65,7 @@ DOCS_HTML := $(DOCS_XML:@objroot@%.xml=@srcroot@%.html)
 DOCS_MAN3 := $(DOCS_XML:@objroot@%.xml=@srcroot@%.3)
 DOCS := $(DOCS_HTML) $(DOCS_MAN3)
 CTESTS := @srcroot@test/aligned_alloc.c @srcroot@test/allocated.c \
-	@srcroot@test/bitmap.c @srcroot@test/mremap.c @srcroot@test/null.c \
+	@srcroot@test/bitmap.c @srcroot@test/mremap.c \
 	@srcroot@test/posix_memalign.c @srcroot@test/thread_arena.c \
 	@srcroot@test/thread_tcache_enabled.c
 ifeq (@enable_experimental@, 1)

include/jemalloc/internal/jemalloc_internal.h.in

@@ -633,6 +633,8 @@ isalloc(const void *ptr)
 	size_t ret;
 	arena_chunk_t *chunk;
 
+	assert(ptr != NULL);
+
 	chunk = (arena_chunk_t *)CHUNK_ADDR2BASE(ptr);
 	if (chunk != ptr) {
 		/* Region. */
@@ -640,10 +642,8 @@ isalloc(const void *ptr)
 			ret = arena_salloc_demote(ptr);
 		else
 			ret = arena_salloc(ptr);
-	} else if (ptr != NULL)
+	} else
 		ret = huge_salloc(ptr);
-	else
-		ret = 0;
 
 	return (ret);
 }
@@ -664,10 +664,12 @@ idalloc(void *ptr)
 {
 	arena_chunk_t *chunk;
 
+	assert(ptr != NULL);
+
 	chunk = (arena_chunk_t *)CHUNK_ADDR2BASE(ptr);
 	if (chunk != ptr)
 		arena_dalloc(chunk->arena, chunk, ptr);
-	else if (ptr != NULL)
+	else
 		huge_dalloc(ptr, true);
 }
 

src/jemalloc.c

@@ -1100,18 +1100,22 @@ JEMALLOC_ATTR(visibility("default"))
 void
 je_free(void *ptr)
 {
-	size_t usize;
 
-	assert(malloc_initialized || IS_INITIALIZER);
+	if (ptr != NULL) {
+		size_t usize;
 
-	if (config_prof && opt_prof) {
-		usize = isalloc(ptr);
-		prof_free(ptr, usize);
-	} else if (config_stats)
-		usize = isalloc(ptr);
-	if (config_stats)
-		thread_allocated_tsd_get()->deallocated += usize;
-	idalloc(ptr);
+		assert(malloc_initialized || IS_INITIALIZER);
+
+		if (config_prof && opt_prof) {
+			usize = isalloc(ptr);
+			prof_free(ptr, usize);
+		} else if (config_stats) {
+			usize = isalloc(ptr);
+		}
+		if (config_stats)
+			thread_allocated_tsd_get()->deallocated += usize;
+		idalloc(ptr);
+	}
 }
 
 /*
@@ -1196,7 +1200,7 @@ je_malloc_usable_size(const void *ptr)
 	if (config_ivsalloc)
 		ret = ivsalloc(ptr);
 	else
-		ret = isalloc(ptr);
+		ret = (ptr != NULL) ? isalloc(ptr) : 0;
 
 	return (ret);
 }

test/null.c

@@ -1,19 +0,0 @@
-#include <stdio.h>
-#include <assert.h>
-
-#define	JEMALLOC_MANGLE
-#include "jemalloc_test.h"
-
-int
-main(void)
-{
-
-	fprintf(stderr, "Test begin\n");
-
-	free(malloc(1));
-	free(NULL);
-	assert(malloc_usable_size(NULL) == 0);
-
-	fprintf(stderr, "Test end\n");
-	return (0);
-}

test/null.exp

@@ -1,2 +0,0 @@
-Test begin
-Test end