diff options
Diffstat (limited to 'JavaScriptCore/jit/ExecutableAllocator.cpp')
-rw-r--r-- | JavaScriptCore/jit/ExecutableAllocator.cpp | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/JavaScriptCore/jit/ExecutableAllocator.cpp b/JavaScriptCore/jit/ExecutableAllocator.cpp index 5e10e86..86c24fd 100644 --- a/JavaScriptCore/jit/ExecutableAllocator.cpp +++ b/JavaScriptCore/jit/ExecutableAllocator.cpp @@ -33,7 +33,48 @@ namespace JSC { size_t ExecutableAllocator::pageSize = 0; +#if ENABLE(EXECUTABLE_ALLOCATOR_DEMAND) + +void ExecutableAllocator::intializePageSize() +{ +#if 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 = PageAllocation::pagesize(); +#endif +} + +ExecutablePool::Allocation ExecutablePool::systemAlloc(size_t size) +{ + PageAllocation allocation = PageAllocation::allocate(size, PageAllocation::JSJITCodePages, EXECUTABLE_POOL_WRITABLE, true); + if (!allocation) + CRASH(); + return allocation; +} + +void ExecutablePool::systemRelease(ExecutablePool::Allocation& allocation) +{ + allocation.deallocate(); +} + +bool ExecutableAllocator::isValid() const +{ + return true; +} + +#endif + #if ENABLE(ASSEMBLER_WX_EXCLUSIVE) + +#if OS(WINDOWS) || OS(SYMBIAN) +#error "ASSEMBLER_WX_EXCLUSIVE not yet suported on this platform." +#endif + void ExecutableAllocator::reprotectRegion(void* start, size_t size, ProtectionSeting setting) { if (!pageSize) @@ -52,9 +93,11 @@ void ExecutableAllocator::reprotectRegion(void* start, size_t size, ProtectionSe mprotect(pageStart, size, (setting == Writable) ? PROTECTION_FLAGS_RW : PROTECTION_FLAGS_RX); } + #endif #if CPU(ARM_TRADITIONAL) && OS(LINUX) && COMPILER(RVCT) + __asm void ExecutableAllocator::cacheFlush(void* code, size_t size) { ARM @@ -67,6 +110,7 @@ __asm void ExecutableAllocator::cacheFlush(void* code, size_t size) pop {r7} bx lr } + #endif } |