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This is a more sensible home for SectionMemoryManager, and allows the implementation to be shared between Orc and MCJIT. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@228427 91177308-0d34-0410-b5e6-96231b3b80d8
179 lines
6.4 KiB
C++
179 lines
6.4 KiB
C++
//===- SectionMemoryManager.cpp - Memory manager for MCJIT/RtDyld *- C++ -*-==//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the section-based memory manager used by the MCJIT
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// execution engine and RuntimeDyld
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Config/config.h"
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#include "llvm/ExecutionEngine/SectionMemoryManager.h"
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#include "llvm/Support/MathExtras.h"
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namespace llvm {
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uint8_t *SectionMemoryManager::allocateDataSection(uintptr_t Size,
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unsigned Alignment,
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unsigned SectionID,
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StringRef SectionName,
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bool IsReadOnly) {
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if (IsReadOnly)
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return allocateSection(RODataMem, Size, Alignment);
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return allocateSection(RWDataMem, Size, Alignment);
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}
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uint8_t *SectionMemoryManager::allocateCodeSection(uintptr_t Size,
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unsigned Alignment,
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unsigned SectionID,
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StringRef SectionName) {
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return allocateSection(CodeMem, Size, Alignment);
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}
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uint8_t *SectionMemoryManager::allocateSection(MemoryGroup &MemGroup,
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uintptr_t Size,
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unsigned Alignment) {
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if (!Alignment)
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Alignment = 16;
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assert(!(Alignment & (Alignment - 1)) && "Alignment must be a power of two.");
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uintptr_t RequiredSize = Alignment * ((Size + Alignment - 1)/Alignment + 1);
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uintptr_t Addr = 0;
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// Look in the list of free memory regions and use a block there if one
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// is available.
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for (int i = 0, e = MemGroup.FreeMem.size(); i != e; ++i) {
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sys::MemoryBlock &MB = MemGroup.FreeMem[i];
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if (MB.size() >= RequiredSize) {
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Addr = (uintptr_t)MB.base();
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uintptr_t EndOfBlock = Addr + MB.size();
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// Align the address.
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Addr = (Addr + Alignment - 1) & ~(uintptr_t)(Alignment - 1);
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// Store cutted free memory block.
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MemGroup.FreeMem[i] = sys::MemoryBlock((void*)(Addr + Size),
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EndOfBlock - Addr - Size);
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return (uint8_t*)Addr;
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}
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}
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// No pre-allocated free block was large enough. Allocate a new memory region.
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// Note that all sections get allocated as read-write. The permissions will
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// be updated later based on memory group.
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//
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// FIXME: It would be useful to define a default allocation size (or add
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// it as a constructor parameter) to minimize the number of allocations.
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//
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// FIXME: Initialize the Near member for each memory group to avoid
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// interleaving.
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std::error_code ec;
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sys::MemoryBlock MB = sys::Memory::allocateMappedMemory(RequiredSize,
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&MemGroup.Near,
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sys::Memory::MF_READ |
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sys::Memory::MF_WRITE,
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ec);
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if (ec) {
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// FIXME: Add error propagation to the interface.
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return nullptr;
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}
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// Save this address as the basis for our next request
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MemGroup.Near = MB;
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MemGroup.AllocatedMem.push_back(MB);
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Addr = (uintptr_t)MB.base();
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uintptr_t EndOfBlock = Addr + MB.size();
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// Align the address.
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Addr = (Addr + Alignment - 1) & ~(uintptr_t)(Alignment - 1);
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// The allocateMappedMemory may allocate much more memory than we need. In
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// this case, we store the unused memory as a free memory block.
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unsigned FreeSize = EndOfBlock-Addr-Size;
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if (FreeSize > 16)
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MemGroup.FreeMem.push_back(sys::MemoryBlock((void*)(Addr + Size), FreeSize));
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// Return aligned address
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return (uint8_t*)Addr;
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}
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bool SectionMemoryManager::finalizeMemory(std::string *ErrMsg)
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{
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// FIXME: Should in-progress permissions be reverted if an error occurs?
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std::error_code ec;
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// Don't allow free memory blocks to be used after setting protection flags.
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CodeMem.FreeMem.clear();
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// Make code memory executable.
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ec = applyMemoryGroupPermissions(CodeMem,
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sys::Memory::MF_READ | sys::Memory::MF_EXEC);
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if (ec) {
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if (ErrMsg) {
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*ErrMsg = ec.message();
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}
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return true;
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}
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// Don't allow free memory blocks to be used after setting protection flags.
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RODataMem.FreeMem.clear();
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// Make read-only data memory read-only.
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ec = applyMemoryGroupPermissions(RODataMem,
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sys::Memory::MF_READ | sys::Memory::MF_EXEC);
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if (ec) {
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if (ErrMsg) {
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*ErrMsg = ec.message();
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}
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return true;
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}
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// Read-write data memory already has the correct permissions
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// Some platforms with separate data cache and instruction cache require
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// explicit cache flush, otherwise JIT code manipulations (like resolved
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// relocations) will get to the data cache but not to the instruction cache.
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invalidateInstructionCache();
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return false;
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}
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std::error_code
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SectionMemoryManager::applyMemoryGroupPermissions(MemoryGroup &MemGroup,
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unsigned Permissions) {
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for (int i = 0, e = MemGroup.AllocatedMem.size(); i != e; ++i) {
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std::error_code ec;
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ec =
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sys::Memory::protectMappedMemory(MemGroup.AllocatedMem[i], Permissions);
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if (ec) {
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return ec;
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}
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}
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return std::error_code();
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}
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void SectionMemoryManager::invalidateInstructionCache() {
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for (int i = 0, e = CodeMem.AllocatedMem.size(); i != e; ++i)
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sys::Memory::InvalidateInstructionCache(CodeMem.AllocatedMem[i].base(),
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CodeMem.AllocatedMem[i].size());
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}
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SectionMemoryManager::~SectionMemoryManager() {
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for (unsigned i = 0, e = CodeMem.AllocatedMem.size(); i != e; ++i)
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sys::Memory::releaseMappedMemory(CodeMem.AllocatedMem[i]);
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for (unsigned i = 0, e = RWDataMem.AllocatedMem.size(); i != e; ++i)
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sys::Memory::releaseMappedMemory(RWDataMem.AllocatedMem[i]);
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for (unsigned i = 0, e = RODataMem.AllocatedMem.size(); i != e; ++i)
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sys::Memory::releaseMappedMemory(RODataMem.AllocatedMem[i]);
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}
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} // namespace llvm
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