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Extend RTDyld API to enable optionally precomputing the total amount of memory

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required for all sections in a module. This can be useful when targets or
code-models place strict requirements on how sections must be laid out
in memory.

If RTDyldMemoryManger::needsToReserveAllocationSpace() is overridden to return
true then the JIT will call the following method on the memory manager, which
can be used to preallocate the necessary memory.

void RTDyldMemoryManager::reserveAllocationSpace(uintptr_t CodeSize,
                                                 uintptr_t DataSizeRO,
                                                 uintptr_t DataSizeRW)

Patch by Vaidas Gasiunas. Thanks very much Viadas!



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201259 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Lang Hames
2014-02-12 21:30:07 +00:00
parent 29a60e6deb
commit 061a739395
5 changed files with 351 additions and 66 deletions
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14
include/llvm/ExecutionEngine/RTDyldMemoryManager.h
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@@ -52,6 +52,20 @@ public:
uintptr_t Size, unsigned Alignment, unsigned SectionID,
StringRef SectionName, bool IsReadOnly) = 0;
/// Inform the memory manager about the total amount of memory required to
/// allocate all sections to be loaded:
/// \p CodeSize - the total size of all code sections
/// \p DataSizeRO - the total size of all read-only data sections
/// \p DataSizeRW - the total size of all read-write data sections
///
/// Note that by default the callback is disabled. To enable it
/// redefine the method needsToReserveAllocationSpace to return true.
virtual void reserveAllocationSpace(
uintptr_t CodeSize, uintptr_t DataSizeRO, uintptr_t DataSizeRW) { }
/// Override to return true to enable the reserveAllocationSpace callback.
virtual bool needsToReserveAllocationSpace() { return false; }
/// Register the EH frames with the runtime so that c++ exceptions work.
///
/// \p Addr parameter provides the local address of the EH frame section