#include "ExecutableAllocator.h"
+#if ENABLE(EXECUTABLE_ALLOCATOR_DEMAND)
+#include "CodeProfiling.h"
+#include <wtf/HashSet.h>
+#include <wtf/MetaAllocator.h>
+#include <wtf/PageReservation.h>
+#if ENABLE(ASSEMBLER_WX_EXCLUSIVE)
+#include <wtf/PassOwnPtr.h>
+#endif
+#include <wtf/ThreadingPrimitives.h>
+#include <wtf/VMTags.h>
+#endif
+
+// Uncomment to create an artificial executable memory usage limit. This limit
+// is imperfect and is primarily useful for testing the VM's ability to handle
+// out-of-executable-memory situations.
+// #define EXECUTABLE_MEMORY_LIMIT 1000000
+
#if ENABLE(ASSEMBLER)
-namespace JSC {
+using namespace WTF;
-size_t ExecutableAllocator::pageSize = 0;
+namespace JSC {
#if ENABLE(EXECUTABLE_ALLOCATOR_DEMAND)
-void ExecutableAllocator::intializePageSize()
+class DemandExecutableAllocator : public MetaAllocator {
+public:
+ DemandExecutableAllocator()
+ : MetaAllocator(jitAllocationGranule)
+ {
+ MutexLocker lock(allocatorsMutex());
+ allocators().add(this);
+ // Don't preallocate any memory here.
+ }
+
+ virtual ~DemandExecutableAllocator()
+ {
+ {
+ MutexLocker lock(allocatorsMutex());
+ allocators().remove(this);
+ }
+ for (unsigned i = 0; i < reservations.size(); ++i)
+ reservations.at(i).deallocate();
+ }
+
+ static size_t bytesAllocatedByAllAllocators()
+ {
+ size_t total = 0;
+ MutexLocker lock(allocatorsMutex());
+ for (HashSet<DemandExecutableAllocator*>::const_iterator allocator = allocators().begin(); allocator != allocators().end(); ++allocator)
+ total += (*allocator)->bytesAllocated();
+ return total;
+ }
+
+ static size_t bytesCommittedByAllocactors()
+ {
+ size_t total = 0;
+ MutexLocker lock(allocatorsMutex());
+ for (HashSet<DemandExecutableAllocator*>::const_iterator allocator = allocators().begin(); allocator != allocators().end(); ++allocator)
+ total += (*allocator)->bytesCommitted();
+ return total;
+ }
+
+#if ENABLE(META_ALLOCATOR_PROFILE)
+ static void dumpProfileFromAllAllocators()
+ {
+ MutexLocker lock(allocatorsMutex());
+ for (HashSet<DemandExecutableAllocator*>::const_iterator allocator = allocators().begin(); allocator != allocators().end(); ++allocator)
+ (*allocator)->dumpProfile();
+ }
+#endif
+
+protected:
+ virtual void* allocateNewSpace(size_t& numPages)
+ {
+ size_t newNumPages = (((numPages * pageSize() + JIT_ALLOCATOR_LARGE_ALLOC_SIZE - 1) / JIT_ALLOCATOR_LARGE_ALLOC_SIZE * JIT_ALLOCATOR_LARGE_ALLOC_SIZE) + pageSize() - 1) / pageSize();
+
+ ASSERT(newNumPages >= numPages);
+
+ numPages = newNumPages;
+
+#ifdef EXECUTABLE_MEMORY_LIMIT
+ if (bytesAllocatedByAllAllocators() >= EXECUTABLE_MEMORY_LIMIT)
+ return 0;
+#endif
+
+ PageReservation reservation = PageReservation::reserve(numPages * pageSize(), OSAllocator::JSJITCodePages, EXECUTABLE_POOL_WRITABLE, true);
+ RELEASE_ASSERT(reservation);
+
+ reservations.append(reservation);
+
+ return reservation.base();
+ }
+
+ virtual void notifyNeedPage(void* page)
+ {
+ OSAllocator::commit(page, pageSize(), EXECUTABLE_POOL_WRITABLE, true);
+ }
+
+ virtual void notifyPageIsFree(void* page)
+ {
+ OSAllocator::decommit(page, pageSize());
+ }
+
+private:
+ Vector<PageReservation, 16> reservations;
+ static HashSet<DemandExecutableAllocator*>& allocators()
+ {
+ DEFINE_STATIC_LOCAL(HashSet<DemandExecutableAllocator*>, sAllocators, ());
+ return sAllocators;
+ }
+ static Mutex& allocatorsMutex()
+ {
+ DEFINE_STATIC_LOCAL(Mutex, mutex, ());
+ return mutex;
+ }
+};
+
+#if ENABLE(ASSEMBLER_WX_EXCLUSIVE)
+void ExecutableAllocator::initializeAllocator()
{
-#if OS(SYMBIAN) && CPU(ARMV5_OR_LOWER)
- // The moving memory model (as used in ARMv5 and earlier platforms)
- // on Symbian OS limits the number of chunks for each process to 16.
- // To mitigate this limitation increase the pagesize to allocate
- // fewer, larger chunks. Set the page size to 256 Kb to compensate
- // for moving memory model limitation
- ExecutableAllocator::pageSize = 256 * 1024;
+}
#else
- ExecutableAllocator::pageSize = WTF::pageSize();
-#endif
+static DemandExecutableAllocator* gAllocator;
+
+namespace {
+static inline DemandExecutableAllocator* allocator()
+{
+ return gAllocator;
+}
+}
+
+void ExecutableAllocator::initializeAllocator()
+{
+ ASSERT(!gAllocator);
+ gAllocator = new DemandExecutableAllocator();
+ CodeProfiling::notifyAllocator(gAllocator);
}
+#endif
-ExecutablePool::Allocation ExecutablePool::systemAlloc(size_t size)
+ExecutableAllocator::ExecutableAllocator(VM&)
+#if ENABLE(ASSEMBLER_WX_EXCLUSIVE)
+ : m_allocator(adoptPtr(new DemandExecutableAllocator()))
+#endif
{
- PageAllocation allocation = PageAllocation::allocate(size, OSAllocator::JSJITCodePages, EXECUTABLE_POOL_WRITABLE, true);
- if (!allocation)
- CRASH();
- return allocation;
+ ASSERT(allocator());
}
-void ExecutablePool::systemRelease(ExecutablePool::Allocation& allocation)
+ExecutableAllocator::~ExecutableAllocator()
{
- allocation.deallocate();
}
bool ExecutableAllocator::isValid() const
{
return true;
}
-
+
bool ExecutableAllocator::underMemoryPressure()
{
+#ifdef EXECUTABLE_MEMORY_LIMIT
+ return DemandExecutableAllocator::bytesAllocatedByAllAllocators() > EXECUTABLE_MEMORY_LIMIT / 2;
+#else
return false;
+#endif
}
-
+
+double ExecutableAllocator::memoryPressureMultiplier(size_t addedMemoryUsage)
+{
+ double result;
+#ifdef EXECUTABLE_MEMORY_LIMIT
+ size_t bytesAllocated = DemandExecutableAllocator::bytesAllocatedByAllAllocators() + addedMemoryUsage;
+ if (bytesAllocated >= EXECUTABLE_MEMORY_LIMIT)
+ bytesAllocated = EXECUTABLE_MEMORY_LIMIT;
+ result = static_cast<double>(EXECUTABLE_MEMORY_LIMIT) /
+ (EXECUTABLE_MEMORY_LIMIT - bytesAllocated);
+#else
+ UNUSED_PARAM(addedMemoryUsage);
+ result = 1.0;
+#endif
+ if (result < 1.0)
+ result = 1.0;
+ return result;
+
+}
+
+PassRefPtr<ExecutableMemoryHandle> ExecutableAllocator::allocate(VM&, size_t sizeInBytes, void* ownerUID, JITCompilationEffort effort)
+{
+ RefPtr<ExecutableMemoryHandle> result = allocator()->allocate(sizeInBytes, ownerUID);
+ RELEASE_ASSERT(result || effort != JITCompilationMustSucceed);
+ return result.release();
+}
+
size_t ExecutableAllocator::committedByteCount()
{
- return 0;
-}
+ return DemandExecutableAllocator::bytesCommittedByAllocactors();
+}
+#if ENABLE(META_ALLOCATOR_PROFILE)
+void ExecutableAllocator::dumpProfile()
+{
+ DemandExecutableAllocator::dumpProfileFromAllAllocators();
+}
#endif
+#endif // ENABLE(EXECUTABLE_ALLOCATOR_DEMAND)
+
#if ENABLE(ASSEMBLER_WX_EXCLUSIVE)
-#if OS(WINDOWS) || OS(SYMBIAN)
+#if OS(WINDOWS)
#error "ASSEMBLER_WX_EXCLUSIVE not yet suported on this platform."
#endif
void ExecutableAllocator::reprotectRegion(void* start, size_t size, ProtectionSetting setting)
{
- if (!pageSize)
- intializePageSize();
+ size_t pageSize = WTF::pageSize();
// Calculate the start of the page containing this region,
// and account for this extra memory within size.
#endif
-#if CPU(ARM_TRADITIONAL) && OS(LINUX) && COMPILER(RVCT)
-
-__asm void ExecutableAllocator::cacheFlush(void* code, size_t size)
-{
- ARM
- push {r7}
- add r1, r1, r0
- mov r7, #0xf0000
- add r7, r7, #0x2
- mov r2, #0x0
- svc #0x0
- pop {r7}
- bx lr
-}
-
-#endif
-
}
#endif // HAVE(ASSEMBLER)
projects / apple / javascriptcore.git / blobdiff