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<title>[180359] trunk/Source/bmalloc</title>
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<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/180359">180359</a></dd>
<dt>Author</dt> <dd>ggaren@apple.com</dd>
<dt>Date</dt> <dd>2015-02-19 12:42:52 -0800 (Thu, 19 Feb 2015)</dd>
</dl>
<h3>Log Message</h3>
<pre>bmalloc should implement malloc introspection (to stop false-positive leaks when MallocStackLogging is off)
https://bugs.webkit.org/show_bug.cgi?id=141802
Reviewed by Andreas Kling.
This patch does the bare minimum to stop false positive leaks from
being reported by the Darwin leaks tool. We register each super chunk
as a single object, and then request that the leaks tool scan it.
* bmalloc.xcodeproj/project.pbxproj: Added an abstraction for the malloc
zone introspection API.
* bmalloc/Algorithm.h: Missing #include.
* bmalloc/VMHeap.cpp:
(bmalloc::VMHeap::grow):
* bmalloc/VMHeap.h: Adopt the new abstraction.
* bmalloc/Zone.cpp: Added.
(bmalloc::remoteRead): Helper for reading an object out of another process.
(bmalloc::Zone::enumerator):
(bmalloc::Zone::Zone): Register a malloc zone so that we will participate
in introspection.
* bmalloc/Zone.h: Added.
(bmalloc::Zone::superChunks):
(bmalloc::Zone::addSuperChunk): Use a non-dynamically-allocated vector
since our dynamic allocations will not be scanned by leaks since they
will have the malloc VM tag.</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#trunkSourcebmallocChangeLog">trunk/Source/bmalloc/ChangeLog</a></li>
<li><a href="#trunkSourcebmallocbmallocAlgorithmh">trunk/Source/bmalloc/bmalloc/Algorithm.h</a></li>
<li><a href="#trunkSourcebmallocbmallocVMHeapcpp">trunk/Source/bmalloc/bmalloc/VMHeap.cpp</a></li>
<li><a href="#trunkSourcebmallocbmallocVMHeaph">trunk/Source/bmalloc/bmalloc/VMHeap.h</a></li>
<li><a href="#trunkSourcebmallocbmallocxcodeprojprojectpbxproj">trunk/Source/bmalloc/bmalloc.xcodeproj/project.pbxproj</a></li>
</ul>
<h3>Added Paths</h3>
<ul>
<li><a href="#trunkSourcebmallocbmallocZonecpp">trunk/Source/bmalloc/bmalloc/Zone.cpp</a></li>
<li><a href="#trunkSourcebmallocbmallocZoneh">trunk/Source/bmalloc/bmalloc/Zone.h</a></li>
</ul>
</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunkSourcebmallocChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/Source/bmalloc/ChangeLog (180358 => 180359)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/bmalloc/ChangeLog 2015-02-19 20:36:39 UTC (rev 180358)
+++ trunk/Source/bmalloc/ChangeLog 2015-02-19 20:42:52 UTC (rev 180359)
</span><span class="lines">@@ -1,3 +1,35 @@
</span><ins>+2015-02-19 Geoffrey Garen <ggaren@apple.com>
+
+ bmalloc should implement malloc introspection (to stop false-positive leaks when MallocStackLogging is off)
+ https://bugs.webkit.org/show_bug.cgi?id=141802
+
+ Reviewed by Andreas Kling.
+
+ This patch does the bare minimum to stop false positive leaks from
+ being reported by the Darwin leaks tool. We register each super chunk
+ as a single object, and then request that the leaks tool scan it.
+
+ * bmalloc.xcodeproj/project.pbxproj: Added an abstraction for the malloc
+ zone introspection API.
+
+ * bmalloc/Algorithm.h: Missing #include.
+
+ * bmalloc/VMHeap.cpp:
+ (bmalloc::VMHeap::grow):
+ * bmalloc/VMHeap.h: Adopt the new abstraction.
+
+ * bmalloc/Zone.cpp: Added.
+ (bmalloc::remoteRead): Helper for reading an object out of another process.
+ (bmalloc::Zone::enumerator):
+ (bmalloc::Zone::Zone): Register a malloc zone so that we will participate
+ in introspection.
+
+ * bmalloc/Zone.h: Added.
+ (bmalloc::Zone::superChunks):
+ (bmalloc::Zone::addSuperChunk): Use a non-dynamically-allocated vector
+ since our dynamic allocations will not be scanned by leaks since they
+ will have the malloc VM tag.
+
</ins><span class="cx"> 2015-02-18 Geoffrey Garen <ggaren@apple.com>
</span><span class="cx">
</span><span class="cx"> bmalloc: VMHeap should keep a record of all of its VM ranges (for malloc introspection)
</span></span></pre></div>
<a id="trunkSourcebmallocbmallocAlgorithmh"></a>
<div class="modfile"><h4>Modified: trunk/Source/bmalloc/bmalloc/Algorithm.h (180358 => 180359)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/bmalloc/bmalloc/Algorithm.h 2015-02-19 20:36:39 UTC (rev 180358)
+++ trunk/Source/bmalloc/bmalloc/Algorithm.h 2015-02-19 20:42:52 UTC (rev 180359)
</span><span class="lines">@@ -27,6 +27,7 @@
</span><span class="cx"> #define Algorithm_h
</span><span class="cx">
</span><span class="cx"> #include "Algorithm.h"
</span><ins>+#include "BAssert.h"
</ins><span class="cx"> #include <algorithm>
</span><span class="cx"> #include <cstdint>
</span><span class="cx"> #include <cstddef>
</span></span></pre></div>
<a id="trunkSourcebmallocbmallocVMHeapcpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/bmalloc/bmalloc/VMHeap.cpp (180358 => 180359)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/bmalloc/bmalloc/VMHeap.cpp 2015-02-19 20:36:39 UTC (rev 180358)
+++ trunk/Source/bmalloc/bmalloc/VMHeap.cpp 2015-02-19 20:42:52 UTC (rev 180359)
</span><span class="lines">@@ -40,7 +40,9 @@
</span><span class="cx"> void VMHeap::grow()
</span><span class="cx"> {
</span><span class="cx"> SuperChunk* superChunk = SuperChunk::create();
</span><del>- m_superChunks.push(superChunk);
</del><ins>+#if BPLATFORM(DARWIN)
+ m_zone.addSuperChunk(superChunk);
+#endif
</ins><span class="cx">
</span><span class="cx"> SmallChunk* smallChunk = superChunk->smallChunk();
</span><span class="cx"> for (auto* it = smallChunk->begin(); it != smallChunk->end(); ++it)
</span></span></pre></div>
<a id="trunkSourcebmallocbmallocVMHeaph"></a>
<div class="modfile"><h4>Modified: trunk/Source/bmalloc/bmalloc/VMHeap.h (180358 => 180359)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/bmalloc/bmalloc/VMHeap.h 2015-02-19 20:36:39 UTC (rev 180358)
+++ trunk/Source/bmalloc/bmalloc/VMHeap.h 2015-02-19 20:42:52 UTC (rev 180359)
</span><span class="lines">@@ -34,6 +34,9 @@
</span><span class="cx"> #include "SegregatedFreeList.h"
</span><span class="cx"> #include "SmallChunk.h"
</span><span class="cx"> #include "Vector.h"
</span><ins>+#if BPLATFORM(DARWIN)
+#include "Zone.h"
+#endif
</ins><span class="cx">
</span><span class="cx"> namespace bmalloc {
</span><span class="cx">
</span><span class="lines">@@ -61,7 +64,9 @@
</span><span class="cx"> Vector<SmallPage*> m_smallPages;
</span><span class="cx"> Vector<MediumPage*> m_mediumPages;
</span><span class="cx"> SegregatedFreeList m_largeRanges;
</span><del>- Vector<SuperChunk*> m_superChunks;
</del><ins>+#if BPLATFORM(DARWIN)
+ Zone m_zone;
+#endif
</ins><span class="cx"> };
</span><span class="cx">
</span><span class="cx"> inline SmallPage* VMHeap::allocateSmallPage()
</span></span></pre></div>
<a id="trunkSourcebmallocbmallocZonecpp"></a>
<div class="addfile"><h4>Added: trunk/Source/bmalloc/bmalloc/Zone.cpp (0 => 180359)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/bmalloc/bmalloc/Zone.cpp (rev 0)
+++ trunk/Source/bmalloc/bmalloc/Zone.cpp 2015-02-19 20:42:52 UTC (rev 180359)
</span><span class="lines">@@ -0,0 +1,72 @@
</span><ins>+/*
+ * Copyright (C) 2014, 2015 Apple 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:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 APPLE INC. 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.
+ */
+
+#include "Sizes.h"
+#include "Zone.h"
+
+namespace bmalloc {
+
+// The memory analysis API requires the contents of this struct to be a static
+// constant in the program binary. The leaks process will load this struct
+// out of the program binary (and not out of the running process).
+static malloc_introspection_t introspect = {
+ .enumerator = Zone::enumerator
+};
+
+template<typename T> static void remoteRead(task_t task, memory_reader_t reader, vm_address_t pointer, T& result)
+{
+ void* tmp;
+ (*reader)(task, pointer, sizeof(T), &tmp);
+ memcpy(&result, tmp, sizeof(T));
+}
+
+// This function runs inside the leaks process.
+kern_return_t Zone::enumerator(task_t task, void* context, unsigned type_mask, vm_address_t zone_address, memory_reader_t reader, vm_range_recorder_t recorder)
+{
+ Zone remoteZone;
+ remoteRead(task, reader, zone_address, remoteZone);
+
+ for (auto* superChunk : remoteZone.superChunks()) {
+ vm_range_t range = { reinterpret_cast<vm_address_t>(superChunk), superChunkSize };
+
+ if ((type_mask & MALLOC_PTR_REGION_RANGE_TYPE))
+ (*recorder)(task, context, MALLOC_PTR_REGION_RANGE_TYPE, &range, 1);
+
+ if ((type_mask & MALLOC_PTR_IN_USE_RANGE_TYPE))
+ (*recorder)(task, context, MALLOC_PTR_IN_USE_RANGE_TYPE, &range, 1);
+ }
+
+ return 0;
+}
+
+Zone::Zone()
+{
+ version = 4;
+ zone_name = "WebKit Malloc";
+ introspect = &bmalloc::introspect;
+ malloc_zone_register(this);
+}
+
+} // namespace bmalloc
</ins></span></pre></div>
<a id="trunkSourcebmallocbmallocZoneh"></a>
<div class="addfile"><h4>Added: trunk/Source/bmalloc/bmalloc/Zone.h (0 => 180359)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/bmalloc/bmalloc/Zone.h (rev 0)
+++ trunk/Source/bmalloc/bmalloc/Zone.h 2015-02-19 20:42:52 UTC (rev 180359)
</span><span class="lines">@@ -0,0 +1,73 @@
</span><ins>+/*
+ * Copyright (C) 2014, 2015 Apple 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:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 APPLE INC. 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.
+ */
+
+#ifndef Zone_h
+#define Zone_h
+
+#include "FixedVector.h"
+#include <malloc/malloc.h>
+
+namespace bmalloc {
+
+class SuperChunk;
+
+class Zone : public malloc_zone_t {
+public:
+ // Enough capacity to track a 64GB heap, so probably enough for anything.
+ static const size_t capacity = 2048;
+
+ static kern_return_t enumerator(task_t, void* context, unsigned type_mask, vm_address_t, memory_reader_t, vm_range_recorder_t);
+
+ Zone();
+
+ void addSuperChunk(SuperChunk*);
+ FixedVector<SuperChunk*, capacity>& superChunks() { return m_superChunks; }
+
+private:
+ // This vector has two purposes:
+ // (1) It stores the list of SuperChunks so that we can enumerate
+ // each SuperChunk and request that it be scanned if reachable.
+ // (2) It roots a pointer to each SuperChunk in a global non-malloc
+ // VM region, making each SuperChunk appear reachable, and therefore
+ // ensuring that the leaks tool will scan it. (The leaks tool
+ // conservatively scans all writeable VM regions that are not malloc
+ // regions, and then scans malloc regions using the introspection API.)
+ // This prevents the leaks tool from reporting false positive leaks for
+ // objects pointed to from bmalloc memory -- though it also prevents the
+ // leaks tool from finding any leaks in bmalloc memory.
+ FixedVector<SuperChunk*, capacity> m_superChunks;
+};
+
+inline void Zone::addSuperChunk(SuperChunk* superChunk)
+{
+ if (m_superChunks.size() == m_superChunks.capacity())
+ return;
+
+ m_superChunks.push(superChunk);
+}
+
+} // namespace bmalloc
+
+#endif // Zone_h
</ins></span></pre></div>
<a id="trunkSourcebmallocbmallocxcodeprojprojectpbxproj"></a>
<div class="modfile"><h4>Modified: trunk/Source/bmalloc/bmalloc.xcodeproj/project.pbxproj (180358 => 180359)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/bmalloc/bmalloc.xcodeproj/project.pbxproj 2015-02-19 20:36:39 UTC (rev 180358)
+++ trunk/Source/bmalloc/bmalloc.xcodeproj/project.pbxproj 2015-02-19 20:42:52 UTC (rev 180359)
</span><span class="lines">@@ -16,6 +16,8 @@
</span><span class="cx"> 143CB81C19022BC900B16A45 /* StaticMutex.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 143CB81A19022BC900B16A45 /* StaticMutex.cpp */; };
</span><span class="cx"> 143CB81D19022BC900B16A45 /* StaticMutex.h in Headers */ = {isa = PBXBuildFile; fileRef = 143CB81B19022BC900B16A45 /* StaticMutex.h */; settings = {ATTRIBUTES = (Private, ); }; };
</span><span class="cx"> 1440AFC91A95142400837FAA /* SuperChunk.h in Headers */ = {isa = PBXBuildFile; fileRef = 1440AFC81A95142400837FAA /* SuperChunk.h */; settings = {ATTRIBUTES = (Private, ); }; };
</span><ins>+ 1440AFCB1A95261100837FAA /* Zone.h in Headers */ = {isa = PBXBuildFile; fileRef = 1440AFCA1A95261100837FAA /* Zone.h */; settings = {ATTRIBUTES = (Private, ); }; };
+ 1440AFCD1A9527AF00837FAA /* Zone.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 1440AFCC1A9527AF00837FAA /* Zone.cpp */; };
</ins><span class="cx"> 1448C30018F3754600502839 /* mbmalloc.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 1448C2FF18F3754300502839 /* mbmalloc.cpp */; };
</span><span class="cx"> 1448C30118F3754C00502839 /* bmalloc.h in Headers */ = {isa = PBXBuildFile; fileRef = 1448C2FE18F3754300502839 /* bmalloc.h */; settings = {ATTRIBUTES = (Private, ); }; };
</span><span class="cx"> 14895D911A3A319C0006235D /* Environment.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 14895D8F1A3A319C0006235D /* Environment.cpp */; };
</span><span class="lines">@@ -92,6 +94,8 @@
</span><span class="cx"> 143E29E918CAE8BE00FE8A0F /* MediumPage.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = MediumPage.h; path = bmalloc/MediumPage.h; sourceTree = "<group>"; };
</span><span class="cx"> 143E29ED18CAE90500FE8A0F /* SmallPage.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = SmallPage.h; path = bmalloc/SmallPage.h; sourceTree = "<group>"; };
</span><span class="cx"> 1440AFC81A95142400837FAA /* SuperChunk.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = SuperChunk.h; path = bmalloc/SuperChunk.h; sourceTree = "<group>"; };
</span><ins>+ 1440AFCA1A95261100837FAA /* Zone.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = Zone.h; path = bmalloc/Zone.h; sourceTree = "<group>"; };
+ 1440AFCC1A9527AF00837FAA /* Zone.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = Zone.cpp; path = bmalloc/Zone.cpp; sourceTree = "<group>"; };
</ins><span class="cx"> 144469E417A46BFE00F9EA1D /* Cache.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; lineEnding = 0; name = Cache.cpp; path = bmalloc/Cache.cpp; sourceTree = "<group>"; xcLanguageSpecificationIdentifier = xcode.lang.cpp; };
</span><span class="cx"> 144469E517A46BFE00F9EA1D /* Cache.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; lineEnding = 0; name = Cache.h; path = bmalloc/Cache.h; sourceTree = "<group>"; xcLanguageSpecificationIdentifier = xcode.lang.objcpp; };
</span><span class="cx"> 144469FD17A61F1F00F9EA1D /* PerThread.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; lineEnding = 0; name = PerThread.h; path = bmalloc/PerThread.h; sourceTree = "<group>"; xcLanguageSpecificationIdentifier = xcode.lang.objcpp; };
</span><span class="lines">@@ -260,6 +264,8 @@
</span><span class="cx"> 1440AFC81A95142400837FAA /* SuperChunk.h */,
</span><span class="cx"> 144F7BFB18BFC517003537F3 /* VMHeap.cpp */,
</span><span class="cx"> 144F7BFC18BFC517003537F3 /* VMHeap.h */,
</span><ins>+ 1440AFCA1A95261100837FAA /* Zone.h */,
+ 1440AFCC1A9527AF00837FAA /* Zone.cpp */,
</ins><span class="cx"> );
</span><span class="cx"> name = heap;
</span><span class="cx"> sourceTree = "<group>";
</span><span class="lines">@@ -305,6 +311,7 @@
</span><span class="cx"> 14C919C918FCC59F0028DB43 /* BPlatform.h in Headers */,
</span><span class="cx"> 14DD788C18F48CAE00950702 /* LargeChunk.h in Headers */,
</span><span class="cx"> 14DD789218F48CFC00950702 /* EndTag.h in Headers */,
</span><ins>+ 1440AFCB1A95261100837FAA /* Zone.h in Headers */,
</ins><span class="cx"> 140FA00519CE4B6800FFD3C8 /* LineMetadata.h in Headers */,
</span><span class="cx"> 14DD78CC18F48D7500950702 /* PerThread.h in Headers */,
</span><span class="cx"> 14DD78B418F48D6B00950702 /* Chunk.h in Headers */,
</span><span class="lines">@@ -433,6 +440,7 @@
</span><span class="cx"> 14F271C818EA3990008C152F /* ObjectType.cpp in Sources */,
</span><span class="cx"> 14F271C518EA397E008C152F /* Deallocator.cpp in Sources */,
</span><span class="cx"> 14F271C418EA397B008C152F /* Cache.cpp in Sources */,
</span><ins>+ 1440AFCD1A9527AF00837FAA /* Zone.cpp in Sources */,
</ins><span class="cx"> );
</span><span class="cx"> runOnlyForDeploymentPostprocessing = 0;
</span><span class="cx"> };
</span></span></pre>
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