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+// Copyright (c) 2006, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+// * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+// * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+// * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// ---
+// Author: Sanjay Ghemawat
+// Maxim Lifantsev (refactoring)
+//
+
+#ifndef BASE_HEAP_PROFILE_TABLE_H_
+#define BASE_HEAP_PROFILE_TABLE_H_
+
+#include "addressmap-inl.h"
+#include "base/basictypes.h"
+#include "base/logging.h" // for RawFD
+
+// Table to maintain a heap profile data inside,
+// i.e. the set of currently active heap memory allocations.
+// thread-unsafe and non-reentrant code:
+// each instance object must be used by one thread
+// at a time w/o self-recursion.
+//
+// TODO(maxim): add a unittest for this class.
+class HeapProfileTable {
+ public:
+
+ // Extension to be used for heap pforile files.
+ static const char kFileExt[];
+
+ // Longest stack trace we record. Defined in the .cc file.
+ static const int kMaxStackDepth;
+
+ // data types ----------------------------
+
+ // Profile stats.
+ struct Stats {
+ int32 allocs; // Number of allocation calls
+ int32 frees; // Number of free calls
+ int64 alloc_size; // Total size of all allocated objects so far
+ int64 free_size; // Total size of all freed objects so far
+
+ // semantic equality
+ bool Equivalent(const Stats& x) const {
+ return allocs - frees == x.allocs - x.frees &&
+ alloc_size - free_size == x.alloc_size - x.free_size;
+ }
+ };
+
+ // Info we can return about an allocation.
+ struct AllocInfo {
+ size_t object_size; // size of the allocation
+ const void* const* call_stack; // call stack that made the allocation call
+ int stack_depth; // depth of call_stack
+ bool live;
+ bool ignored;
+ };
+
+ // Info we return about an allocation context.
+ // An allocation context is a unique caller stack trace
+ // of an allocation operation.
+ struct AllocContextInfo : public Stats {
+ int stack_depth; // Depth of stack trace
+ const void* const* call_stack; // Stack trace
+ };
+
+ // Memory (de)allocator interface we'll use.
+ typedef void* (*Allocator)(size_t size);
+ typedef void (*DeAllocator)(void* ptr);
+
+ // interface ---------------------------
+
+ HeapProfileTable(Allocator alloc, DeAllocator dealloc);
+ ~HeapProfileTable();
+
+ // Record an allocation at 'ptr' of 'bytes' bytes.
+ // skip_count gives the number of stack frames between this call
+ // and the memory allocation function that was asked to do the allocation.
+ void RecordAlloc(const void* ptr, size_t bytes, int skip_count);
+
+ // Direct version of RecordAlloc when the caller stack to use
+ // is already known: call_stack of depth stack_depth.
+ void RecordAllocWithStack(const void* ptr, size_t bytes,
+ int stack_depth, const void* const call_stack[]);
+
+ // Record the deallocation of memory at 'ptr'.
+ void RecordFree(const void* ptr);
+
+ // Return true iff we have recorded an allocation at 'ptr'.
+ // If yes, fill *object_size with the allocation byte size.
+ bool FindAlloc(const void* ptr, size_t* object_size) const;
+ // Same as FindAlloc, but fills all of *info.
+ bool FindAllocDetails(const void* ptr, AllocInfo* info) const;
+
+ // Return true iff "ptr" points into a recorded allocation
+ // If yes, fill *object_ptr with the actual allocation address
+ // and *object_size with the allocation byte size.
+ // max_size specifies largest currently possible allocation size.
+ bool FindInsideAlloc(const void* ptr, size_t max_size,
+ const void** object_ptr, size_t* object_size) const;
+
+ // If "ptr" points to a recorded allocation and it's not marked as live
+ // mark it as live and return true. Else return false.
+ // All allocations start as non-live.
+ bool MarkAsLive(const void* ptr);
+
+ // If "ptr" points to a recorded allocation, mark it as "ignored".
+ // Ignored objects are treated like other objects, except that they
+ // are skipped in heap checking reports.
+ void MarkAsIgnored(const void* ptr);
+
+ // Return current total (de)allocation statistics.
+ const Stats& total() const { return total_; }
+
+ // Allocation data iteration callback: gets passed object pointer and
+ // fully-filled AllocInfo.
+ typedef void (*AllocIterator)(const void* ptr, const AllocInfo& info);
+
+ // Iterate over the allocation profile data calling "callback"
+ // for every allocation.
+ void IterateAllocs(AllocIterator callback) const {
+ allocation_->Iterate(MapArgsAllocIterator, callback);
+ }
+
+ // Allocation context profile data iteration callback
+ typedef void (*AllocContextIterator)(const AllocContextInfo& info);
+
+ // Iterate over the allocation context profile data calling "callback"
+ // for every allocation context. Allocation contexts are ordered by the
+ // size of allocated space.
+ void IterateOrderedAllocContexts(AllocContextIterator callback) const;
+
+ // Fill profile data into buffer 'buf' of size 'size'
+ // and return the actual size occupied by the dump in 'buf'.
+ // The profile buckets are dumped in the decreasing order
+ // of currently allocated bytes.
+ // We do not provision for 0-terminating 'buf'.
+ int FillOrderedProfile(char buf[], int size) const;
+
+ // Cleanup any old profile files matching prefix + ".*" + kFileExt.
+ static void CleanupOldProfiles(const char* prefix);
+
+ // Return a snapshot of the current contents of *this.
+ // Caller must call ReleaseSnapshot() on result when no longer needed.
+ // The result is only valid while this exists and until
+ // the snapshot is discarded by calling ReleaseSnapshot().
+ class Snapshot;
+ Snapshot* TakeSnapshot();
+
+ // Release a previously taken snapshot. snapshot must not
+ // be used after this call.
+ void ReleaseSnapshot(Snapshot* snapshot);
+
+ // Return a snapshot of every non-live, non-ignored object in *this.
+ // If "base" is non-NULL, skip any objects present in "base".
+ // As a side-effect, clears the "live" bit on every live object in *this.
+ // Caller must call ReleaseSnapshot() on result when no longer needed.
+ Snapshot* NonLiveSnapshot(Snapshot* base);
+
+ private:
+
+ // data types ----------------------------
+
+ // Hash table bucket to hold (de)allocation stats
+ // for a given allocation call stack trace.
+ struct Bucket : public Stats {
+ uintptr_t hash; // Hash value of the stack trace
+ int depth; // Depth of stack trace
+ const void** stack; // Stack trace
+ Bucket* next; // Next entry in hash-table
+ };
+
+ // Info stored in the address map
+ struct AllocValue {
+ // Access to the stack-trace bucket
+ Bucket* bucket() const {
+ return reinterpret_cast<Bucket*>(bucket_rep & ~uintptr_t(kMask));
+ }
+ // This also does set_live(false).
+ void set_bucket(Bucket* b) { bucket_rep = reinterpret_cast<uintptr_t>(b); }
+ size_t bytes; // Number of bytes in this allocation
+
+ // Access to the allocation liveness flag (for leak checking)
+ bool live() const { return bucket_rep & kLive; }
+ void set_live(bool l) {
+ bucket_rep = (bucket_rep & ~uintptr_t(kLive)) | (l ? kLive : 0);
+ }
+
+ // Should this allocation be ignored if it looks like a leak?
+ bool ignore() const { return bucket_rep & kIgnore; }
+ void set_ignore(bool r) {
+ bucket_rep = (bucket_rep & ~uintptr_t(kIgnore)) | (r ? kIgnore : 0);
+ }
+
+ private:
+ // We store a few bits in the bottom bits of bucket_rep.
+ // (Alignment is at least four, so we have at least two bits.)
+ static const int kLive = 1;
+ static const int kIgnore = 2;
+ static const int kMask = kLive | kIgnore;
+
+ uintptr_t bucket_rep;
+ };
+
+ // helper for FindInsideAlloc
+ static size_t AllocValueSize(const AllocValue& v) { return v.bytes; }
+
+ typedef AddressMap<AllocValue> AllocationMap;
+
+ // Arguments that need to be passed DumpNonLiveIterator callback below.
+ struct DumpArgs {
+ RawFD fd; // file to write to
+ Stats* profile_stats; // stats to update (may be NULL)
+
+ DumpArgs(RawFD a, Stats* d)
+ : fd(a), profile_stats(d) { }
+ };
+
+ // helpers ----------------------------
+
+ // Unparse bucket b and print its portion of profile dump into buf.
+ // We return the amount of space in buf that we use. We start printing
+ // at buf + buflen, and promise not to go beyond buf + bufsize.
+ // We do not provision for 0-terminating 'buf'.
+ //
+ // If profile_stats is non-NULL, we update *profile_stats by
+ // counting bucket b.
+ //
+ // "extra" is appended to the unparsed bucket. Typically it is empty,
+ // but may be set to something like " heapprofile" for the total
+ // bucket to indicate the type of the profile.
+ static int UnparseBucket(const Bucket& b,
+ char* buf, int buflen, int bufsize,
+ const char* extra,
+ Stats* profile_stats);
+
+ // Get the bucket for the caller stack trace 'key' of depth 'depth'
+ // creating the bucket if needed.
+ Bucket* GetBucket(int depth, const void* const key[]);
+
+ // Helper for IterateAllocs to do callback signature conversion
+ // from AllocationMap::Iterate to AllocIterator.
+ static void MapArgsAllocIterator(const void* ptr, AllocValue* v,
+ AllocIterator callback) {
+ AllocInfo info;
+ info.object_size = v->bytes;
+ info.call_stack = v->bucket()->stack;
+ info.stack_depth = v->bucket()->depth;
+ info.live = v->live();
+ info.ignored = v->ignore();
+ callback(ptr, info);
+ }
+
+ // Helper for DumpNonLiveProfile to do object-granularity
+ // heap profile dumping. It gets passed to AllocationMap::Iterate.
+ inline static void DumpNonLiveIterator(const void* ptr, AllocValue* v,
+ const DumpArgs& args);
+
+ // Helper for IterateOrderedAllocContexts and FillOrderedProfile.
+ // Creates a sorted list of Buckets whose length is num_buckets_.
+ // The caller is responsible for dellocating the returned list.
+ Bucket** MakeSortedBucketList() const;
+
+ // Helper for TakeSnapshot. Saves object to snapshot.
+ static void AddToSnapshot(const void* ptr, AllocValue* v, Snapshot* s);
+
+ // Arguments passed to AddIfNonLive
+ struct AddNonLiveArgs {
+ Snapshot* dest;
+ Snapshot* base;
+ };
+
+ // Helper for NonLiveSnapshot. Adds the object to the destination
+ // snapshot if it is non-live.
+ static void AddIfNonLive(const void* ptr, AllocValue* v,
+ AddNonLiveArgs* arg);
+
+ // Write contents of "*allocations" as a heap profile to
+ // "file_name". "total" must contain the total of all entries in
+ // "*allocations".
+ static bool WriteProfile(const char* file_name,
+ const Bucket& total,
+ AllocationMap* allocations);
+
+ // data ----------------------------
+
+ // Memory (de)allocator that we use.
+ Allocator alloc_;
+ DeAllocator dealloc_;
+
+ // Overall profile stats; we use only the Stats part,
+ // but make it a Bucket to pass to UnparseBucket.
+ Bucket total_;
+
+ // Bucket hash table.
+ // We hand-craft one instead of using one of the pre-written
+ // ones because we do not want to use malloc when operating on the table.
+ // It is only few lines of code, so no big deal.
+ Bucket** table_;
+ int num_buckets_;
+
+ // Map of all currently allocated objects we know about.
+ AllocationMap* allocation_;
+
+ DISALLOW_EVIL_CONSTRUCTORS(HeapProfileTable);
+};
+
+class HeapProfileTable::Snapshot {
+ public:
+ const Stats& total() const { return total_; }
+
+ // Report anything in this snapshot as a leak.
+ // May use new/delete for temporary storage.
+ // If should_symbolize is true, will fork (which is not threadsafe)
+ // to turn addresses into symbol names. Set to false for maximum safety.
+ // Also writes a heap profile to "filename" that contains
+ // all of the objects in this snapshot.
+ void ReportLeaks(const char* checker_name, const char* filename,
+ bool should_symbolize);
+
+ // Report the addresses of all leaked objects.
+ // May use new/delete for temporary storage.
+ void ReportIndividualObjects();
+
+ bool Empty() const {
+ return (total_.allocs == 0) && (total_.alloc_size == 0);
+ }
+
+ private:
+ friend class HeapProfileTable;
+
+ // Total count/size are stored in a Bucket so we can reuse UnparseBucket
+ Bucket total_;
+
+ // We share the Buckets managed by the parent table, but have our
+ // own object->bucket map.
+ AllocationMap map_;
+
+ Snapshot(Allocator alloc, DeAllocator dealloc) : map_(alloc, dealloc) {
+ memset(&total_, 0, sizeof(total_));
+ }
+
+ // Callback used to populate a Snapshot object with entries found
+ // in another allocation map.
+ inline void Add(const void* ptr, const AllocValue& v) {
+ map_.Insert(ptr, v);
+ total_.allocs++;
+ total_.alloc_size += v.bytes;
+ }
+
+ // Helpers for sorting and generating leak reports
+ struct Entry;
+ struct ReportState;
+ static void ReportCallback(const void* ptr, AllocValue* v, ReportState*);
+ static void ReportObject(const void* ptr, AllocValue* v, char*);
+
+ DISALLOW_COPY_AND_ASSIGN(Snapshot);
+};
+
+#endif // BASE_HEAP_PROFILE_TABLE_H_
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