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<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/181307">181307</a></dd>
<dt>Author</dt> <dd>ggaren@apple.com</dd>
<dt>Date</dt> <dd>2015-03-09 21:10:15 -0700 (Mon, 09 Mar 2015)</dd>
</dl>
<h3>Log Message</h3>
<pre>bmalloc: tryFastMalloc shouldn't crash
https://bugs.webkit.org/show_bug.cgi?id=142443
Reviewed by Darin Adler.
Source/bmalloc:
Added support for tryMalloc.
We assume that non-x-large allocations always succeed, and we crash
otherwise, since normal allocation failure will just cause the next
non-try allocation or internal metadata allocation to fail, and it's
hard and not really useful to keep limping along after that. But
extra-large allocations can meaningfully fail, and we can recover.
* bmalloc/Heap.cpp:
(bmalloc::Heap::allocateXLarge):
(bmalloc::Heap::tryAllocateXLarge):
* bmalloc/Heap.h: Added support for non-crashy x-large allocation.
* bmalloc/VMAllocate.h:
(bmalloc::tryVMAllocate):
(bmalloc::vmAllocate): Added support for non-crashy VM allocation.
* bmalloc/bmalloc.h:
(bmalloc::api::tryMalloc):
(bmalloc::api::realloc):
(bmalloc::api::free): Tried to clarify our behavior with some comments.
Unfortunately, calling what we do "malloc" is still not quite right, since
malloc returns null on failure and we don't.
Source/WTF:
* wtf/FastMalloc.cpp:
(WTF::fastMalloc):
(WTF::fastRealloc):
(WTF::fastAlignedMalloc): Don't check for null. bmalloc automatically
crashes on allocation failure, and we'd rather not pay for an extra check.
(WTF::tryFastMalloc): Added an opt-out API to return null rather than
crashing, since some clients need this.
(WTF::tryFastRealloc): Deleted. Unused.
* wtf/FastMalloc.h:</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#trunkSourceWTFChangeLog">trunk/Source/WTF/ChangeLog</a></li>
<li><a href="#trunkSourceWTFwtfFastMalloccpp">trunk/Source/WTF/wtf/FastMalloc.cpp</a></li>
<li><a href="#trunkSourceWTFwtfFastMalloch">trunk/Source/WTF/wtf/FastMalloc.h</a></li>
<li><a href="#trunkSourcebmallocChangeLog">trunk/Source/bmalloc/ChangeLog</a></li>
<li><a href="#trunkSourcebmallocbmallocHeapcpp">trunk/Source/bmalloc/bmalloc/Heap.cpp</a></li>
<li><a href="#trunkSourcebmallocbmallocHeaph">trunk/Source/bmalloc/bmalloc/Heap.h</a></li>
<li><a href="#trunkSourcebmallocbmallocVMAllocateh">trunk/Source/bmalloc/bmalloc/VMAllocate.h</a></li>
<li><a href="#trunkSourcebmallocbmallocbmalloch">trunk/Source/bmalloc/bmalloc/bmalloc.h</a></li>
</ul>
</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunkSourceWTFChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/Source/WTF/ChangeLog (181306 => 181307)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WTF/ChangeLog 2015-03-10 03:01:01 UTC (rev 181306)
+++ trunk/Source/WTF/ChangeLog 2015-03-10 04:10:15 UTC (rev 181307)
</span><span class="lines">@@ -1,3 +1,23 @@
</span><ins>+2015-03-09 Geoffrey Garen <ggaren@apple.com>
+
+ bmalloc: tryFastMalloc shouldn't crash
+ https://bugs.webkit.org/show_bug.cgi?id=142443
+
+ Reviewed by Darin Adler.
+
+ * wtf/FastMalloc.cpp:
+ (WTF::fastMalloc):
+ (WTF::fastRealloc):
+ (WTF::fastAlignedMalloc): Don't check for null. bmalloc automatically
+ crashes on allocation failure, and we'd rather not pay for an extra check.
+
+ (WTF::tryFastMalloc): Added an opt-out API to return null rather than
+ crashing, since some clients need this.
+
+ (WTF::tryFastRealloc): Deleted. Unused.
+
+ * wtf/FastMalloc.h:
+
</ins><span class="cx"> 2015-03-09 Mark Lam <mark.lam@apple.com>
</span><span class="cx">
</span><span class="cx"> 8-bit version of weakCompareAndSwap() can cause an infinite loop.
</span></span></pre></div>
<a id="trunkSourceWTFwtfFastMalloccpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/WTF/wtf/FastMalloc.cpp (181306 => 181307)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WTF/wtf/FastMalloc.cpp 2015-03-10 03:01:01 UTC (rev 181306)
+++ trunk/Source/WTF/wtf/FastMalloc.cpp 2015-03-10 04:10:15 UTC (rev 181307)
</span><span class="lines">@@ -150,11 +150,6 @@
</span><span class="cx"> free(p);
</span><span class="cx"> }
</span><span class="cx">
</span><del>-TryMallocReturnValue tryFastRealloc(void* p, size_t n)
-{
- return realloc(p, n);
-}
-
</del><span class="cx"> void* fastRealloc(void* p, size_t n)
</span><span class="cx"> {
</span><span class="cx"> void* result = realloc(p, n);
</span><span class="lines">@@ -194,10 +189,7 @@
</span><span class="cx">
</span><span class="cx"> void* fastMalloc(size_t size)
</span><span class="cx"> {
</span><del>- void* result = bmalloc::api::malloc(size);
- if (!result)
- CRASH();
- return result;
</del><ins>+ return bmalloc::api::malloc(size);
</ins><span class="cx"> }
</span><span class="cx">
</span><span class="cx"> void* fastCalloc(size_t numElements, size_t elementSize)
</span><span class="lines">@@ -212,10 +204,7 @@
</span><span class="cx">
</span><span class="cx"> void* fastRealloc(void* object, size_t size)
</span><span class="cx"> {
</span><del>- void* result = bmalloc::api::realloc(object, size);
- if (!result)
- CRASH();
- return result;
</del><ins>+ return bmalloc::api::realloc(object, size);
</ins><span class="cx"> }
</span><span class="cx">
</span><span class="cx"> void fastFree(void* object)
</span><span class="lines">@@ -239,10 +228,7 @@
</span><span class="cx">
</span><span class="cx"> void* fastAlignedMalloc(size_t alignment, size_t size)
</span><span class="cx"> {
</span><del>- void* result = bmalloc::api::memalign(alignment, size);
- if (!result)
- CRASH();
- return result;
</del><ins>+ return bmalloc::api::memalign(alignment, size);
</ins><span class="cx"> }
</span><span class="cx">
</span><span class="cx"> void fastAlignedFree(void* p)
</span><span class="lines">@@ -252,14 +238,9 @@
</span><span class="cx">
</span><span class="cx"> TryMallocReturnValue tryFastMalloc(size_t size)
</span><span class="cx"> {
</span><del>- return bmalloc::api::malloc(size);
</del><ins>+ return bmalloc::api::tryMalloc(size);
</ins><span class="cx"> }
</span><span class="cx">
</span><del>-TryMallocReturnValue tryFastRealloc(void* object, size_t size)
-{
- return bmalloc::api::realloc(object, size);
-}
-
</del><span class="cx"> TryMallocReturnValue tryFastCalloc(size_t numElements, size_t elementSize)
</span><span class="cx"> {
</span><span class="cx"> Checked<size_t, RecordOverflow> checkedSize = elementSize;
</span></span></pre></div>
<a id="trunkSourceWTFwtfFastMalloch"></a>
<div class="modfile"><h4>Modified: trunk/Source/WTF/wtf/FastMalloc.h (181306 => 181307)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WTF/wtf/FastMalloc.h 2015-03-10 03:01:01 UTC (rev 181306)
+++ trunk/Source/WTF/wtf/FastMalloc.h 2015-03-10 04:10:15 UTC (rev 181307)
</span><span class="lines">@@ -48,7 +48,6 @@
</span><span class="cx"> WTF_EXPORT_PRIVATE TryMallocReturnValue tryFastMalloc(size_t);
</span><span class="cx"> TryMallocReturnValue tryFastZeroedMalloc(size_t);
</span><span class="cx"> WTF_EXPORT_PRIVATE TryMallocReturnValue tryFastCalloc(size_t numElements, size_t elementSize);
</span><del>-WTF_EXPORT_PRIVATE TryMallocReturnValue tryFastRealloc(void*, size_t);
</del><span class="cx">
</span><span class="cx"> WTF_EXPORT_PRIVATE void fastFree(void*);
</span><span class="cx">
</span><span class="lines">@@ -108,7 +107,6 @@
</span><span class="cx"> using WTF::fastZeroedMalloc;
</span><span class="cx"> using WTF::tryFastCalloc;
</span><span class="cx"> using WTF::tryFastMalloc;
</span><del>-using WTF::tryFastRealloc;
</del><span class="cx"> using WTF::tryFastZeroedMalloc;
</span><span class="cx"> using WTF::fastAlignedMalloc;
</span><span class="cx"> using WTF::fastAlignedFree;
</span></span></pre></div>
<a id="trunkSourcebmallocChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/Source/bmalloc/ChangeLog (181306 => 181307)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/bmalloc/ChangeLog 2015-03-10 03:01:01 UTC (rev 181306)
+++ trunk/Source/bmalloc/ChangeLog 2015-03-10 04:10:15 UTC (rev 181307)
</span><span class="lines">@@ -1,3 +1,34 @@
</span><ins>+2015-03-09 Geoffrey Garen <ggaren@apple.com>
+
+ bmalloc: tryFastMalloc shouldn't crash
+ https://bugs.webkit.org/show_bug.cgi?id=142443
+
+ Reviewed by Darin Adler.
+
+ Added support for tryMalloc.
+
+ We assume that non-x-large allocations always succeed, and we crash
+ otherwise, since normal allocation failure will just cause the next
+ non-try allocation or internal metadata allocation to fail, and it's
+ hard and not really useful to keep limping along after that. But
+ extra-large allocations can meaningfully fail, and we can recover.
+
+ * bmalloc/Heap.cpp:
+ (bmalloc::Heap::allocateXLarge):
+ (bmalloc::Heap::tryAllocateXLarge):
+ * bmalloc/Heap.h: Added support for non-crashy x-large allocation.
+
+ * bmalloc/VMAllocate.h:
+ (bmalloc::tryVMAllocate):
+ (bmalloc::vmAllocate): Added support for non-crashy VM allocation.
+
+ * bmalloc/bmalloc.h:
+ (bmalloc::api::tryMalloc):
+ (bmalloc::api::realloc):
+ (bmalloc::api::free): Tried to clarify our behavior with some comments.
+ Unfortunately, calling what we do "malloc" is still not quite right, since
+ malloc returns null on failure and we don't.
+
</ins><span class="cx"> 2015-03-03 Geoffrey Garen <ggaren@apple.com>
</span><span class="cx">
</span><span class="cx"> bmalloc: Don't branch when setting the owner of a large object
</span></span></pre></div>
<a id="trunkSourcebmallocbmallocHeapcpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/bmalloc/bmalloc/Heap.cpp (181306 => 181307)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/bmalloc/bmalloc/Heap.cpp 2015-03-10 03:01:01 UTC (rev 181306)
+++ trunk/Source/bmalloc/bmalloc/Heap.cpp 2015-03-10 04:10:15 UTC (rev 181307)
</span><span class="lines">@@ -281,14 +281,10 @@
</span><span class="cx"> }
</span><span class="cx"> }
</span><span class="cx">
</span><del>-void* Heap::allocateXLarge(std::lock_guard<StaticMutex>&, size_t alignment, size_t size)
</del><ins>+void* Heap::allocateXLarge(std::lock_guard<StaticMutex>& lock, size_t alignment, size_t size)
</ins><span class="cx"> {
</span><del>- BASSERT(isPowerOfTwo(alignment));
- BASSERT(alignment >= xLargeAlignment);
- BASSERT(size == roundUpToMultipleOf<xLargeAlignment>(size));
-
- void* result = vmAllocate(alignment, size);
- m_xLargeObjects.push(Range(result, size));
</del><ins>+ void* result = tryAllocateXLarge(lock, alignment, size);
+ RELEASE_BASSERT(result);
</ins><span class="cx"> return result;
</span><span class="cx"> }
</span><span class="cx">
</span><span class="lines">@@ -297,6 +293,19 @@
</span><span class="cx"> return allocateXLarge(lock, superChunkSize, size);
</span><span class="cx"> }
</span><span class="cx">
</span><ins>+void* Heap::tryAllocateXLarge(std::lock_guard<StaticMutex>&, size_t alignment, size_t size)
+{
+ BASSERT(isPowerOfTwo(alignment));
+ BASSERT(alignment >= superChunkSize);
+ BASSERT(size == roundUpToMultipleOf<xLargeAlignment>(size));
+
+ void* result = tryVMAllocate(alignment, size);
+ if (!result)
+ return nullptr;
+ m_xLargeObjects.push(Range(result, size));
+ return result;
+}
+
</ins><span class="cx"> Range Heap::findXLarge(std::lock_guard<StaticMutex>&, void* object)
</span><span class="cx"> {
</span><span class="cx"> for (auto& range : m_xLargeObjects) {
</span></span></pre></div>
<a id="trunkSourcebmallocbmallocHeaph"></a>
<div class="modfile"><h4>Modified: trunk/Source/bmalloc/bmalloc/Heap.h (181306 => 181307)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/bmalloc/bmalloc/Heap.h 2015-03-10 03:01:01 UTC (rev 181306)
+++ trunk/Source/bmalloc/bmalloc/Heap.h 2015-03-10 04:10:15 UTC (rev 181307)
</span><span class="lines">@@ -65,6 +65,7 @@
</span><span class="cx">
</span><span class="cx"> void* allocateXLarge(std::lock_guard<StaticMutex>&, size_t);
</span><span class="cx"> void* allocateXLarge(std::lock_guard<StaticMutex>&, size_t alignment, size_t);
</span><ins>+ void* tryAllocateXLarge(std::lock_guard<StaticMutex>&, size_t alignment, size_t);
</ins><span class="cx"> Range findXLarge(std::lock_guard<StaticMutex>&, void*);
</span><span class="cx"> void deallocateXLarge(std::unique_lock<StaticMutex>&, void*);
</span><span class="cx">
</span></span></pre></div>
<a id="trunkSourcebmallocbmallocVMAllocateh"></a>
<div class="modfile"><h4>Modified: trunk/Source/bmalloc/bmalloc/VMAllocate.h (181306 => 181307)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/bmalloc/bmalloc/VMAllocate.h 2015-03-10 03:01:01 UTC (rev 181306)
+++ trunk/Source/bmalloc/bmalloc/VMAllocate.h 2015-03-10 04:10:15 UTC (rev 181307)
</span><span class="lines">@@ -73,14 +73,22 @@
</span><span class="cx"> BASSERT(p == mask(p, ~(getpagesize() - 1)));
</span><span class="cx"> }
</span><span class="cx">
</span><del>-inline void* vmAllocate(size_t vmSize)
</del><ins>+inline void* tryVMAllocate(size_t vmSize)
</ins><span class="cx"> {
</span><span class="cx"> vmValidate(vmSize);
</span><span class="cx"> void* result = mmap(0, vmSize, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON, BMALLOC_VM_TAG, 0);
</span><del>- RELEASE_BASSERT(result != MAP_FAILED);
</del><ins>+ if (result == MAP_FAILED)
+ return nullptr;
</ins><span class="cx"> return result;
</span><span class="cx"> }
</span><span class="cx">
</span><ins>+inline void* vmAllocate(size_t vmSize)
+{
+ void* result = tryVMAllocate(vmSize);
+ RELEASE_BASSERT(result);
+ return result;
+}
+
</ins><span class="cx"> inline void vmDeallocate(void* p, size_t vmSize)
</span><span class="cx"> {
</span><span class="cx"> vmValidate(p, vmSize);
</span><span class="lines">@@ -90,13 +98,15 @@
</span><span class="cx"> // Allocates vmSize bytes at a specified power-of-two alignment.
</span><span class="cx"> // Use this function to create maskable memory regions.
</span><span class="cx">
</span><del>-inline void* vmAllocate(size_t vmAlignment, size_t vmSize)
</del><ins>+inline void* tryVMAllocate(size_t vmAlignment, size_t vmSize)
</ins><span class="cx"> {
</span><span class="cx"> vmValidate(vmSize);
</span><span class="cx"> vmValidate(vmAlignment);
</span><span class="cx">
</span><span class="cx"> size_t mappedSize = std::max(vmSize, vmAlignment) + vmAlignment;
</span><del>- char* mapped = static_cast<char*>(vmAllocate(mappedSize));
</del><ins>+ char* mapped = static_cast<char*>(tryVMAllocate(mappedSize));
+ if (!mapped)
+ return nullptr;
</ins><span class="cx"> char* mappedEnd = mapped + mappedSize;
</span><span class="cx">
</span><span class="cx"> char* aligned = roundUpToMultipleOf(vmAlignment, mapped);
</span><span class="lines">@@ -111,6 +121,13 @@
</span><span class="cx"> return aligned;
</span><span class="cx"> }
</span><span class="cx">
</span><ins>+inline void* vmAllocate(size_t vmAlignment, size_t vmSize)
+{
+ void* result = tryVMAllocate(vmAlignment, vmSize);
+ RELEASE_BASSERT(result);
+ return result;
+}
+
</ins><span class="cx"> inline void vmDeallocatePhysicalPages(void* p, size_t vmSize)
</span><span class="cx"> {
</span><span class="cx"> vmValidate(p, vmSize);
</span></span></pre></div>
<a id="trunkSourcebmallocbmallocbmalloch"></a>
<div class="modfile"><h4>Modified: trunk/Source/bmalloc/bmalloc/bmalloc.h (181306 => 181307)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/bmalloc/bmalloc/bmalloc.h 2015-03-10 03:01:01 UTC (rev 181306)
+++ trunk/Source/bmalloc/bmalloc/bmalloc.h 2015-03-10 04:10:15 UTC (rev 181307)
</span><span class="lines">@@ -31,24 +31,37 @@
</span><span class="cx"> namespace bmalloc {
</span><span class="cx"> namespace api {
</span><span class="cx">
</span><ins>+// Returns null on failure.
+inline void* tryMalloc(size_t size)
+{
+ if (size <= largeMax)
+ return Cache::allocate(size);
+
+ std::lock_guard<StaticMutex> lock(PerProcess<Heap>::mutex());
+ return PerProcess<Heap>::get()->tryAllocateXLarge(lock, superChunkSize, roundUpToMultipleOf<xLargeAlignment>(size));
+}
+
+// Crashes on failure.
</ins><span class="cx"> inline void* malloc(size_t size)
</span><span class="cx"> {
</span><span class="cx"> return Cache::allocate(size);
</span><span class="cx"> }
</span><span class="cx">
</span><ins>+// Crashes on failure.
</ins><span class="cx"> inline void* memalign(size_t alignment, size_t size)
</span><span class="cx"> {
</span><span class="cx"> return Cache::allocate(alignment, size);
</span><span class="cx"> }
</span><span class="cx">
</span><del>-inline void free(void* object)
</del><ins>+// Crashes on failure.
+inline void* realloc(void* object, size_t newSize)
</ins><span class="cx"> {
</span><del>- Cache::deallocate(object);
</del><ins>+ return Cache::reallocate(object, newSize);
</ins><span class="cx"> }
</span><span class="cx">
</span><del>-inline void* realloc(void* object, size_t newSize)
</del><ins>+inline void free(void* object)
</ins><span class="cx"> {
</span><del>- return Cache::reallocate(object, newSize);
</del><ins>+ Cache::deallocate(object);
</ins><span class="cx"> }
</span><span class="cx">
</span><span class="cx"> inline void scavengeThisThread()
</span></span></pre>
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