Bug 1558365 - Simplify `PtrInfoTag`. r=glandium

This makes it less mozjemalloc-specific, which is helpful for PHC. No non-test
code uses the extra detail anyway.

Differential Revision: https://phabricator.services.mozilla.com/D34441

--HG--
extra : moz-landing-system : lando

memory/build/mozjemalloc.cpp

@@ -3077,7 +3077,7 @@ inline void MozJemalloc::jemalloc_ptr_info(const void* aPtr,
             &huge)
             ->Search(&key);
     if (node) {
-      *aInfo = {TagLiveHuge, node->mAddr, node->mSize, node->mArena->mId};
+      *aInfo = {TagLiveAlloc, node->mAddr, node->mSize, node->mArena->mId};
       return;
     }
   }
@@ -3101,21 +3101,8 @@ inline void MozJemalloc::jemalloc_ptr_info(const void* aPtr,
   size_t mapbits = chunk->map[pageind].bits;
 
   if (!(mapbits & CHUNK_MAP_ALLOCATED)) {
-    PtrInfoTag tag = TagFreedPageDirty;
-    if (mapbits & CHUNK_MAP_DIRTY) {
-      tag = TagFreedPageDirty;
-    } else if (mapbits & CHUNK_MAP_DECOMMITTED) {
-      tag = TagFreedPageDecommitted;
-    } else if (mapbits & CHUNK_MAP_MADVISED) {
-      tag = TagFreedPageMadvised;
-    } else if (mapbits & CHUNK_MAP_ZEROED) {
-      tag = TagFreedPageZeroed;
-    } else {
-      MOZ_CRASH();
-    }
-
     void* pageaddr = (void*)(uintptr_t(aPtr) & ~gPageSizeMask);
-    *aInfo = {tag, pageaddr, gPageSize, chunk->arena->mId};
+    *aInfo = {TagFreedPage, pageaddr, gPageSize, chunk->arena->mId};
     return;
   }
 
@@ -3148,7 +3135,7 @@ inline void MozJemalloc::jemalloc_ptr_info(const void* aPtr,
     }
 
     void* addr = ((char*)chunk) + (pageind << gPageSize2Pow);
-    *aInfo = {TagLiveLarge, addr, size, chunk->arena->mId};
+    *aInfo = {TagLiveAlloc, addr, size, chunk->arena->mId};
     return;
   }
 
@@ -3177,7 +3164,7 @@ inline void MozJemalloc::jemalloc_ptr_info(const void* aPtr,
   unsigned elm = regind >> (LOG2(sizeof(int)) + 3);
   unsigned bit = regind - (elm << (LOG2(sizeof(int)) + 3));
   PtrInfoTag tag =
-      ((run->mRegionsMask[elm] & (1U << bit))) ? TagFreedSmall : TagLiveSmall;
+      ((run->mRegionsMask[elm] & (1U << bit))) ? TagFreedAlloc : TagLiveAlloc;
 
   *aInfo = {tag, addr, size, chunk->arena->mId};
 }

memory/build/mozjemalloc_types.h

@@ -99,21 +99,16 @@ enum PtrInfoTag {
 
   // The pointer is within a live allocation.
   // 'addr', 'size', and 'arenaId' describe the allocation.
-  TagLiveSmall,
-  TagLiveLarge,
-  TagLiveHuge,
+  TagLiveAlloc,
 
   // The pointer is within a small freed allocation.
   // 'addr', 'size', and 'arenaId' describe the allocation.
-  TagFreedSmall,
+  TagFreedAlloc,
 
   // The pointer is within a freed page. Details about the original
   // allocation, including its size, are not available.
   // 'addr', 'size', and 'arenaId' describe the page.
-  TagFreedPageDirty,
-  TagFreedPageDecommitted,
-  TagFreedPageMadvised,
-  TagFreedPageZeroed,
+  TagFreedPage,
 };
 
 // The information in jemalloc_ptr_info_t could be represented in a variety of
@@ -147,20 +142,15 @@ typedef struct jemalloc_ptr_info_s {
 } jemalloc_ptr_info_t;
 
 static inline bool jemalloc_ptr_is_live(jemalloc_ptr_info_t* info) {
-  return info->tag == TagLiveSmall || info->tag == TagLiveLarge ||
-         info->tag == TagLiveHuge;
+  return info->tag == TagLiveAlloc;
 }
 
 static inline bool jemalloc_ptr_is_freed(jemalloc_ptr_info_t* info) {
-  return info->tag == TagFreedSmall || info->tag == TagFreedPageDirty ||
-         info->tag == TagFreedPageDecommitted ||
-         info->tag == TagFreedPageMadvised || info->tag == TagFreedPageZeroed;
+  return info->tag == TagFreedAlloc || info->tag == TagFreedPage;
 }
 
 static inline bool jemalloc_ptr_is_freed_page(jemalloc_ptr_info_t* info) {
-  return info->tag == TagFreedPageDirty ||
-         info->tag == TagFreedPageDecommitted ||
-         info->tag == TagFreedPageMadvised || info->tag == TagFreedPageZeroed;
+  return info->tag == TagFreedPage;
 }
 
 #ifdef __cplusplus

memory/gtest/TestJemalloc.cpp

@@ -126,7 +126,7 @@ TEST(Jemalloc, PtrInfo)
     ASSERT_TRUE(small.append(p));
     for (size_t j = 0; j < usable; j++) {
       jemalloc_ptr_info(&p[j], &info);
-      ASSERT_TRUE(InfoEq(info, TagLiveSmall, p, usable, arenaId));
+      ASSERT_TRUE(InfoEq(info, TagLiveAlloc, p, usable, arenaId));
     }
   }
 
@@ -137,7 +137,7 @@ TEST(Jemalloc, PtrInfo)
     ASSERT_TRUE(large.append(p));
     for (size_t j = 0; j < usable; j += 347) {
       jemalloc_ptr_info(&p[j], &info);
-      ASSERT_TRUE(InfoEq(info, TagLiveLarge, p, usable, arenaId));
+      ASSERT_TRUE(InfoEq(info, TagLiveAlloc, p, usable, arenaId));
     }
   }
 
@@ -148,7 +148,7 @@ TEST(Jemalloc, PtrInfo)
     ASSERT_TRUE(huge.append(p));
     for (size_t j = 0; j < usable; j += 567) {
       jemalloc_ptr_info(&p[j], &info);
-      ASSERT_TRUE(InfoEq(info, TagLiveHuge, p, usable, arenaId));
+      ASSERT_TRUE(InfoEq(info, TagLiveAlloc, p, usable, arenaId));
     }
   }
 
@@ -158,7 +158,7 @@ TEST(Jemalloc, PtrInfo)
   size_t len;
 
   // Free the small allocations and recheck them.
-  int isFreedSmall = 0, isFreedPage = 0;
+  int isFreedAlloc = 0, isFreedPage = 0;
   len = small.length();
   for (size_t i = 0, j = 0; i < len; i++, j = (j + 19) % len) {
     char* p = small[j];
@@ -167,8 +167,8 @@ TEST(Jemalloc, PtrInfo)
     for (size_t k = 0; k < usable; k++) {
       jemalloc_ptr_info(&p[k], &info);
       // There are two valid outcomes here.
-      if (InfoEq(info, TagFreedSmall, p, usable, arenaId)) {
-        isFreedSmall++;
+      if (InfoEq(info, TagFreedAlloc, p, usable, arenaId)) {
+        isFreedAlloc++;
       } else if (InfoEqFreedPage(info, &p[k], stats.page_size, arenaId)) {
         isFreedPage++;
       } else {
@@ -176,11 +176,11 @@ TEST(Jemalloc, PtrInfo)
       }
     }
   }
-  // There should be both FreedSmall and FreedPage results, but a lot more of
+  // There should be both FreedAlloc and FreedPage results, but a lot more of
   // the former.
-  ASSERT_TRUE(isFreedSmall != 0);
+  ASSERT_TRUE(isFreedAlloc != 0);
   ASSERT_TRUE(isFreedPage != 0);
-  ASSERT_TRUE(isFreedSmall / isFreedPage > 10);
+  ASSERT_TRUE(isFreedAlloc / isFreedPage > 10);
 
   // Free the large allocations and recheck them.
   len = large.length();
@@ -660,7 +660,7 @@ TEST(Jemalloc, GuardRegion)
   jemalloc_ptr_info_t info;
   jemalloc_ptr_info(guard_page, &info);
   ASSERT_TRUE(jemalloc_ptr_is_freed_page(&info));
-  ASSERT_TRUE(info.tag == TagFreedPageDecommitted);
+  ASSERT_TRUE(info.tag == TagFreedPage);
 
   ASSERT_DEATH_WRAP(*(char*)guard_page = 0, "");
 
@@ -677,4 +677,4 @@ TEST(Jemalloc, GuardRegion)
 #  endif
 }
 
-#endif
+#endif