[NFC][asan] Add QuarantineCallback::{PreQuarantine,RecyclePassThrough}

Reviewed By: thurston

Differential Revision: https://reviews.llvm.org/D153496

Author: vitalybuka

compiler-rt/lib/asan/asan_allocator.cpp

@@ -16,6 +16,7 @@
 
 #include "asan_allocator.h"
 
+#include "asan_internal.h"
 #include "asan_mapping.h"
 #include "asan_poisoning.h"
 #include "asan_report.h"
@@ -24,6 +25,7 @@
 #include "lsan/lsan_common.h"
 #include "sanitizer_common/sanitizer_allocator_checks.h"
 #include "sanitizer_common/sanitizer_allocator_interface.h"
+#include "sanitizer_common/sanitizer_common.h"
 #include "sanitizer_common/sanitizer_errno.h"
 #include "sanitizer_common/sanitizer_flags.h"
 #include "sanitizer_common/sanitizer_internal_defs.h"
@@ -196,6 +198,24 @@ struct QuarantineCallback {
         stack_(stack) {
   }
 
+  void PreQuarantine(AsanChunk *m) {
+    Flags &fl = *flags();
+
+    if (fl.max_free_fill_size > 0) {
+      // We have to skip the chunk header, it contains free_context_id.
+      uptr scribble_start = (uptr)m + kChunkHeaderSize + kChunkHeader2Size;
+      if (m->UsedSize() >= kChunkHeader2Size) {  // Skip Header2 in user area.
+        uptr size_to_fill = m->UsedSize() - kChunkHeader2Size;
+        size_to_fill = Min(size_to_fill, (uptr)fl.max_free_fill_size);
+        REAL(memset)((void *)scribble_start, fl.free_fill_byte, size_to_fill);
+      }
+    }
+
+    // Poison the region.
+    PoisonShadow(m->Beg(), RoundUpTo(m->UsedSize(), ASAN_SHADOW_GRANULARITY),
+                 kAsanHeapFreeMagic);
+  }
+
   void Recycle(AsanChunk *m) {
     void *p = get_allocator().GetBlockBegin(m);
     if (p != m) {
@@ -221,6 +241,12 @@ struct QuarantineCallback {
     get_allocator().Deallocate(cache_, p);
   }
 
+  void RecyclePassThrough(AsanChunk *m) {
+    // TODO: We don't need all these here.
+    PreQuarantine(m);
+    Recycle(m);
+  }
+
   void *Allocate(uptr size) {
     void *res = get_allocator().Allocate(cache_, size, 1);
     // TODO(alekseys): Consider making quarantine OOM-friendly.
@@ -639,21 +665,6 @@ struct Allocator {
     AsanThread *t = GetCurrentThread();
     m->SetFreeContext(t ? t->tid() : 0, StackDepotPut(*stack));
 
-    Flags &fl = *flags();
-    if (fl.max_free_fill_size > 0) {
-      // We have to skip the chunk header, it contains free_context_id.
-      uptr scribble_start = (uptr)m + kChunkHeaderSize + kChunkHeader2Size;
-      if (m->UsedSize() >= kChunkHeader2Size) {  // Skip Header2 in user area.
-        uptr size_to_fill = m->UsedSize() - kChunkHeader2Size;
-        size_to_fill = Min(size_to_fill, (uptr)fl.max_free_fill_size);
-        REAL(memset)((void *)scribble_start, fl.free_fill_byte, size_to_fill);
-      }
-    }
-
-    // Poison the region.
-    PoisonShadow(m->Beg(), RoundUpTo(m->UsedSize(), ASAN_SHADOW_GRANULARITY),
-                 kAsanHeapFreeMagic);
-
     // Push into quarantine.
     if (t) {
       AsanThreadLocalMallocStorage *ms = &t->malloc_storage();

compiler-rt/lib/sanitizer_common/sanitizer_quarantine.h

@@ -68,10 +68,6 @@ struct QuarantineBatch {
 
 COMPILER_CHECK(sizeof(QuarantineBatch) <= (1 << 13));  // 8Kb.
 
-// The callback interface is:
-// void Callback::Recycle(Node *ptr);
-// void *cb.Allocate(uptr size);
-// void cb.Deallocate(void *ptr);
 template<typename Callback, typename Node>
 class Quarantine {
  public:
@@ -100,10 +96,11 @@ class Quarantine {
   void Put(Cache *c, Callback cb, Node *ptr, uptr size) {
     uptr max_cache_size = GetMaxCacheSize();
     if (max_cache_size && size <= GetMaxSize()) {
+      cb.PreQuarantine(ptr);
       c->Enqueue(cb, ptr, size);
     } else {
       // GetMaxCacheSize() == 0 only when GetMaxSize() == 0 (see Init).
-      cb.Recycle(ptr);
+      cb.RecyclePassThrough(ptr);
     }
     // Check cache size anyway to accommodate for runtime cache_size change.
     if (c->Size() > max_cache_size)