[ASan] Clean up obsolete stats.

Remove stats that we no longer collect after the allocator change.
Use proper constant SizeClassMap::kNumClasses to fix potential buffer
overflow (https://code.google.com/p/address-sanitizer/issues/detail?id=397).

llvm-svn: 240816

compiler-rt/lib/asan/asan_allocator.cc

@@ -437,11 +437,10 @@ struct Allocator {
     thread_stats.mallocs++;
     thread_stats.malloced += size;
     thread_stats.malloced_redzones += needed_size - size;
-    uptr class_id =
-        Min(kNumberOfSizeClasses, SizeClassMap::ClassID(needed_size));
-    thread_stats.malloced_by_size[class_id]++;
     if (needed_size > SizeClassMap::kMaxSize)
       thread_stats.malloc_large++;
+    else
+      thread_stats.malloced_by_size[SizeClassMap::ClassID(needed_size)]++;
 
     void *res = reinterpret_cast<void *>(user_beg);
     if (can_fill && fl.max_malloc_fill_size) {

compiler-rt/lib/asan/asan_allocator.h

@@ -29,7 +29,6 @@ enum AllocType {
   FROM_NEW_BR = 3   // Memory block came from operator new [ ]
 };
 
-static const uptr kNumberOfSizeClasses = 255;
 struct AsanChunk;
 
 struct AllocatorOptions {
@@ -137,6 +136,7 @@ typedef SizeClassAllocator32<0, SANITIZER_MMAP_RANGE_SIZE, 16,
   AsanMapUnmapCallback> PrimaryAllocator;
 #endif  // SANITIZER_CAN_USE_ALLOCATOR64
 
+static const uptr kNumberOfSizeClasses = SizeClassMap::kNumClasses;
 typedef SizeClassAllocatorLocalCache<PrimaryAllocator> AllocatorCache;
 typedef LargeMmapAllocator<AsanMapUnmapCallback> SecondaryAllocator;
 typedef CombinedAllocator<PrimaryAllocator, AllocatorCache,

compiler-rt/lib/asan/asan_stats.cc

@@ -51,12 +51,8 @@ void AsanStats::Print() {
              (mmaped-munmaped)>>20, mmaped>>20, munmaped>>20,
              mmaps, munmaps);
 
-  PrintMallocStatsArray("  mmaps   by size class: ", mmaped_by_size);
   PrintMallocStatsArray("  mallocs by size class: ", malloced_by_size);
-  PrintMallocStatsArray("  frees   by size class: ", freed_by_size);
-  PrintMallocStatsArray("  rfrees  by size class: ", really_freed_by_size);
-  Printf("Stats: malloc large: %zu small slow: %zu\n",
-             malloc_large, malloc_small_slow);
+  Printf("Stats: malloc large: %zu\n", malloc_large);
 }
 
 void AsanStats::MergeFrom(const AsanStats *stats) {
@@ -161,8 +157,7 @@ uptr __sanitizer_get_free_bytes() {
   GetAccumulatedStats(&stats);
   uptr total_free = stats.mmaped
                   - stats.munmaped
-                  + stats.really_freed
-                  + stats.really_freed_redzones;
+                  + stats.really_freed;
   uptr total_used = stats.malloced
                   + stats.malloced_redzones;
   // Return sane value if total_free < total_used due to racy

compiler-rt/lib/asan/asan_stats.h

@@ -32,20 +32,14 @@ struct AsanStats {
   uptr freed;
   uptr real_frees;
   uptr really_freed;
-  uptr really_freed_redzones;
   uptr reallocs;
   uptr realloced;
   uptr mmaps;
   uptr mmaped;
   uptr munmaps;
   uptr munmaped;
-  uptr mmaped_by_size[kNumberOfSizeClasses];
-  uptr malloced_by_size[kNumberOfSizeClasses];
-  uptr freed_by_size[kNumberOfSizeClasses];
-  uptr really_freed_by_size[kNumberOfSizeClasses];
-
   uptr malloc_large;
-  uptr malloc_small_slow;
+  uptr malloced_by_size[kNumberOfSizeClasses];
 
   // Ctor for global AsanStats (accumulated stats for dead threads).
   explicit AsanStats(LinkerInitialized) { }