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Diffstat (limited to 'unittests/ExecutionEngine/MCJIT/SectionMemoryManager.cpp')
| -rw-r--r-- | unittests/ExecutionEngine/MCJIT/SectionMemoryManager.cpp | 226 |
1 files changed, 0 insertions, 226 deletions
diff --git a/unittests/ExecutionEngine/MCJIT/SectionMemoryManager.cpp b/unittests/ExecutionEngine/MCJIT/SectionMemoryManager.cpp deleted file mode 100644 index e8aaa82..0000000 --- a/unittests/ExecutionEngine/MCJIT/SectionMemoryManager.cpp +++ /dev/null @@ -1,226 +0,0 @@ -//===- SectionMemoryManager.cpp - Memory manager for MCJIT/RtDyld *- C++ -*-==// -// -// The LLVM Compiler Infrastructure -// -// This file is distributed under the University of Illinois Open Source -// License. See LICENSE.TXT for details. -// -//===----------------------------------------------------------------------===// -// -// This file implements the section-based memory manager used by the MCJIT -// execution engine and RuntimeDyld -// -//===----------------------------------------------------------------------===// - -#include "llvm/Config/config.h" -#include "llvm/Support/DynamicLibrary.h" -#include "llvm/Support/MathExtras.h" -#include "SectionMemoryManager.h" - -#ifdef __linux__ - // These includes used by SectionMemoryManager::getPointerToNamedFunction() - // for Glibc trickery. See comments in this function for more information. - #ifdef HAVE_SYS_STAT_H - #include <sys/stat.h> - #endif - #include <fcntl.h> - #include <unistd.h> -#endif - -namespace llvm { - -uint8_t *SectionMemoryManager::allocateDataSection(uintptr_t Size, - unsigned Alignment, - unsigned SectionID, - bool IsReadOnly) { - if (IsReadOnly) - return allocateSection(RODataMem, Size, Alignment); - return allocateSection(RWDataMem, Size, Alignment); -} - -uint8_t *SectionMemoryManager::allocateCodeSection(uintptr_t Size, - unsigned Alignment, - unsigned SectionID) { - return allocateSection(CodeMem, Size, Alignment); -} - -uint8_t *SectionMemoryManager::allocateSection(MemoryGroup &MemGroup, - uintptr_t Size, - unsigned Alignment) { - if (!Alignment) - Alignment = 16; - - assert(!(Alignment & (Alignment - 1)) && "Alignment must be a power of two."); - - uintptr_t RequiredSize = Alignment * ((Size + Alignment - 1)/Alignment + 1); - uintptr_t Addr = 0; - - // Look in the list of free memory regions and use a block there if one - // is available. - for (int i = 0, e = MemGroup.FreeMem.size(); i != e; ++i) { - sys::MemoryBlock &MB = MemGroup.FreeMem[i]; - if (MB.size() >= RequiredSize) { - Addr = (uintptr_t)MB.base(); - uintptr_t EndOfBlock = Addr + MB.size(); - // Align the address. - Addr = (Addr + Alignment - 1) & ~(uintptr_t)(Alignment - 1); - // Store cutted free memory block. - MemGroup.FreeMem[i] = sys::MemoryBlock((void*)(Addr + Size), - EndOfBlock - Addr - Size); - return (uint8_t*)Addr; - } - } - - // No pre-allocated free block was large enough. Allocate a new memory region. - // Note that all sections get allocated as read-write. The permissions will - // be updated later based on memory group. - // - // FIXME: It would be useful to define a default allocation size (or add - // it as a constructor parameter) to minimize the number of allocations. - // - // FIXME: Initialize the Near member for each memory group to avoid - // interleaving. - error_code ec; - sys::MemoryBlock MB = sys::Memory::allocateMappedMemory(RequiredSize, - &MemGroup.Near, - sys::Memory::MF_READ | - sys::Memory::MF_WRITE, - ec); - if (ec) { - // FIXME: Add error propogation to the interface. - return NULL; - } - - // Save this address as the basis for our next request - MemGroup.Near = MB; - - MemGroup.AllocatedMem.push_back(MB); - Addr = (uintptr_t)MB.base(); - uintptr_t EndOfBlock = Addr + MB.size(); - - // Align the address. - Addr = (Addr + Alignment - 1) & ~(uintptr_t)(Alignment - 1); - - // The allocateMappedMemory may allocate much more memory than we need. In - // this case, we store the unused memory as a free memory block. - unsigned FreeSize = EndOfBlock-Addr-Size; - if (FreeSize > 16) - MemGroup.FreeMem.push_back(sys::MemoryBlock((void*)(Addr + Size), FreeSize)); - - // Return aligned address - return (uint8_t*)Addr; -} - -bool SectionMemoryManager::applyPermissions(std::string *ErrMsg) -{ - // FIXME: Should in-progress permissions be reverted if an error occurs? - error_code ec; - - // Make code memory executable. - ec = applyMemoryGroupPermissions(CodeMem, - sys::Memory::MF_READ | sys::Memory::MF_EXEC); - if (ec) { - if (ErrMsg) { - *ErrMsg = ec.message(); - } - return true; - } - - // Make read-only data memory read-only. - ec = applyMemoryGroupPermissions(RODataMem, - sys::Memory::MF_READ | sys::Memory::MF_EXEC); - if (ec) { - if (ErrMsg) { - *ErrMsg = ec.message(); - } - return true; - } - - // Read-write data memory already has the correct permissions - - return false; -} - -error_code SectionMemoryManager::applyMemoryGroupPermissions(MemoryGroup &MemGroup, - unsigned Permissions) { - - for (int i = 0, e = MemGroup.AllocatedMem.size(); i != e; ++i) { - error_code ec; - ec = sys::Memory::protectMappedMemory(MemGroup.AllocatedMem[i], - Permissions); - if (ec) { - return ec; - } - } - - return error_code::success(); -} - -void SectionMemoryManager::invalidateInstructionCache() { - for (int i = 0, e = CodeMem.AllocatedMem.size(); i != e; ++i) - sys::Memory::InvalidateInstructionCache(CodeMem.AllocatedMem[i].base(), - CodeMem.AllocatedMem[i].size()); -} - -static int jit_noop() { - return 0; -} - -void *SectionMemoryManager::getPointerToNamedFunction(const std::string &Name, - bool AbortOnFailure) { -#if defined(__linux__) - //===--------------------------------------------------------------------===// - // Function stubs that are invoked instead of certain library calls - // - // Force the following functions to be linked in to anything that uses the - // JIT. This is a hack designed to work around the all-too-clever Glibc - // strategy of making these functions work differently when inlined vs. when - // not inlined, and hiding their real definitions in a separate archive file - // that the dynamic linker can't see. For more info, search for - // 'libc_nonshared.a' on Google, or read http://llvm.org/PR274. - if (Name == "stat") return (void*)(intptr_t)&stat; - if (Name == "fstat") return (void*)(intptr_t)&fstat; - if (Name == "lstat") return (void*)(intptr_t)&lstat; - if (Name == "stat64") return (void*)(intptr_t)&stat64; - if (Name == "fstat64") return (void*)(intptr_t)&fstat64; - if (Name == "lstat64") return (void*)(intptr_t)&lstat64; - if (Name == "atexit") return (void*)(intptr_t)&atexit; - if (Name == "mknod") return (void*)(intptr_t)&mknod; -#endif // __linux__ - - // We should not invoke parent's ctors/dtors from generated main()! - // On Mingw and Cygwin, the symbol __main is resolved to - // callee's(eg. tools/lli) one, to invoke wrong duplicated ctors - // (and register wrong callee's dtors with atexit(3)). - // We expect ExecutionEngine::runStaticConstructorsDestructors() - // is called before ExecutionEngine::runFunctionAsMain() is called. - if (Name == "__main") return (void*)(intptr_t)&jit_noop; - - const char *NameStr = Name.c_str(); - void *Ptr = sys::DynamicLibrary::SearchForAddressOfSymbol(NameStr); - if (Ptr) return Ptr; - - // If it wasn't found and if it starts with an underscore ('_') character, - // try again without the underscore. - if (NameStr[0] == '_') { - Ptr = sys::DynamicLibrary::SearchForAddressOfSymbol(NameStr+1); - if (Ptr) return Ptr; - } - - if (AbortOnFailure) - report_fatal_error("Program used external function '" + Name + - "' which could not be resolved!"); - return 0; -} - -SectionMemoryManager::~SectionMemoryManager() { - for (unsigned i = 0, e = CodeMem.AllocatedMem.size(); i != e; ++i) - sys::Memory::releaseMappedMemory(CodeMem.AllocatedMem[i]); - for (unsigned i = 0, e = RWDataMem.AllocatedMem.size(); i != e; ++i) - sys::Memory::releaseMappedMemory(RWDataMem.AllocatedMem[i]); - for (unsigned i = 0, e = RODataMem.AllocatedMem.size(); i != e; ++i) - sys::Memory::releaseMappedMemory(RODataMem.AllocatedMem[i]); -} - -} // namespace llvm - |