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mcjit-mem-mgr.cc
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mcjit-mem-mgr.cc
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//===- SectionMemoryManager.cpp - Memory manager for MCJIT/RtDyld *- C++ -*-==//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
// Modified to try out a few fixes.
#include <llvm/Support/MathExtras.h>
#include <llvm/Support/Process.h>
#include "mcjit-mem-mgr.h"
namespace sys = llvm::sys;
using llvm::StringRef;
namespace impala {
static uintptr_t requiredPageSize(uintptr_t Size, uint32_t Alignment) {
static const size_t PageSize = sys::Process::getPageSize();
// Use the same calculation as allocateSection because we need to be able to satisfy it.
uintptr_t RequiredSize = Alignment * ((Size + Alignment - 1)/Alignment + 1);
// Round up to the nearest page size. Blocks must be page-aligned.
return PageSize * ((RequiredSize + PageSize - 1)/PageSize);
}
static uintptr_t alignAddr(uintptr_t Addr, unsigned Alignment) {
return (Addr + Alignment - 1) & ~(uintptr_t)(Alignment - 1);
}
void ImpalaMCJITMemoryManager::reserveAllocationSpace(
uintptr_t CodeSize, uint32_t CodeAlign, uintptr_t RODataSize, uint32_t RODataAlign,
uintptr_t RWDataSize, uint32_t RWDataAlign) {
if (CodeSize == 0 && RODataSize == 0 && RWDataSize == 0) return;
// Get space required for each section.
CodeAlign = CodeAlign ? CodeAlign : 16;
RODataAlign = RODataAlign ? RODataAlign : 16;
RWDataAlign = RWDataAlign ? RWDataAlign : 16;
uintptr_t RequiredCodeSize = requiredPageSize(CodeSize, CodeAlign);
uintptr_t RequiredRODataSize = requiredPageSize(RODataSize, RODataAlign);
uintptr_t RequiredRWDataSize = requiredPageSize(RWDataSize, RWDataAlign);
uintptr_t RequiredSize = RequiredCodeSize + RequiredRODataSize + RequiredRWDataSize;
std::error_code ec;
sys::MemoryBlock MB = sys::Memory::allocateMappedMemory(RequiredSize, nullptr,
sys::Memory::MF_READ | sys::Memory::MF_WRITE, ec);
if (ec) {
LOG(WARNING) << "Unable to pre-allocate JIT memory: " << ec;
return;
}
// Request is page-aligned, so we should always get back exactly the request.
DCHECK_EQ(MB.size(), RequiredSize);
// CodeMem will arbitrarily own this MemoryBlock to handle cleanup.
CodeMem.AllocatedMem.push_back(MB);
uintptr_t Addr = (uintptr_t)MB.base();
FreeMemBlock FreeMB;
FreeMB.PendingPrefixIndex = (unsigned)-1;
if (CodeSize > 0) {
DCHECK_EQ(Addr, alignAddr(Addr, CodeAlign));
FreeMB.Free = sys::MemoryBlock((void*)Addr, RequiredCodeSize);
CodeMem.FreeMem.push_back(FreeMB);
Addr += RequiredCodeSize;
}
if (RODataSize > 0) {
DCHECK_EQ(Addr, alignAddr(Addr, RODataAlign));
FreeMB.Free = sys::MemoryBlock((void*)Addr, RequiredRODataSize);
RODataMem.FreeMem.push_back(FreeMB);
Addr += RequiredRODataSize;
}
if (RWDataSize > 0) {
DCHECK_EQ(Addr, alignAddr(Addr, RWDataAlign));
FreeMB.Free = sys::MemoryBlock((void*)Addr, RequiredRWDataSize);
RWDataMem.FreeMem.push_back(FreeMB);
}
}
uint8_t *ImpalaMCJITMemoryManager::allocateDataSection(uintptr_t Size, unsigned Alignment,
unsigned SectionID, StringRef SectionName, bool IsReadOnly) {
if (IsReadOnly)
return allocateSection(RODataMem, Size, Alignment);
return allocateSection(RWDataMem, Size, Alignment);
}
uint8_t *ImpalaMCJITMemoryManager::allocateCodeSection(uintptr_t Size, unsigned Alignment,
unsigned SectionID, StringRef SectionName) {
return allocateSection(CodeMem, Size, Alignment);
}
uint8_t *ImpalaMCJITMemoryManager::allocateSection(MemoryGroup &MemGroup,
uintptr_t Size, unsigned Alignment) {
// TODO: update this to track actual memory allocation.
bytes_allocated_ += Size;
if (!Alignment)
Alignment = 16;
DCHECK(!(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 (FreeMemBlock &FreeMB : MemGroup.FreeMem) {
if (FreeMB.Free.size() >= RequiredSize) {
Addr = (uintptr_t)FreeMB.Free.base();
uintptr_t EndOfBlock = Addr + FreeMB.Free.size();
// Align the address.
Addr = (Addr + Alignment - 1) & ~(uintptr_t)(Alignment - 1);
if (FreeMB.PendingPrefixIndex == (unsigned)-1) {
// The part of the block we're giving out to the user is now pending
MemGroup.PendingMem.push_back(sys::MemoryBlock((void *)Addr, Size));
// Remember this pending block, such that future allocations can just
// modify it rather than creating a new one
FreeMB.PendingPrefixIndex = MemGroup.PendingMem.size() - 1;
} else {
sys::MemoryBlock &PendingMB = MemGroup.PendingMem[FreeMB.PendingPrefixIndex];
PendingMB = sys::MemoryBlock(PendingMB.base(), Addr + Size - (uintptr_t)PendingMB.base());
}
// Remember how much free space is now left in this block
FreeMB.Free = sys::MemoryBlock((void *)(Addr + Size), EndOfBlock - Addr - Size);
return (uint8_t*)Addr;
}
}
DCHECK(false) << "All memory should be pre-allocated: " << Size << "/" << Alignment;
// 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.
std::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 propagation to the interface.
return nullptr;
}
// Save this address as the basis for our next request
MemGroup.Near = MB;
// michael: 574713c3076c11a5677f554ab132d1324be9cb00
// Copy the address to all the other groups, if they have not
// been initialized.
if (CodeMem.Near.base() == nullptr)
CodeMem.Near = MB;
if (RODataMem.Near.base() == nullptr)
RODataMem.Near = MB;
if (RWDataMem.Near.base() == nullptr)
RWDataMem.Near = MB;
// Remember that we allocated this memory
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 part of the block we're giving out to the user is now pending
MemGroup.PendingMem.push_back(sys::MemoryBlock((void *)Addr, Size));
// 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) {
FreeMemBlock FreeMB;
FreeMB.Free = sys::MemoryBlock((void*)(Addr + Size), FreeSize);
FreeMB.PendingPrefixIndex = (unsigned)-1;
MemGroup.FreeMem.push_back(FreeMB);
}
// Return aligned address
return (uint8_t*)Addr;
}
bool ImpalaMCJITMemoryManager::finalizeMemory(std::string *ErrMsg)
{
// FIXME: Should in-progress permissions be reverted if an error occurs?
std::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.
// michael: ba0e71432a60e1fa2da9e098cbc574a1d9b9618b
ec = applyMemoryGroupPermissions(RODataMem, sys::Memory::MF_READ);
if (ec) {
if (ErrMsg) {
*ErrMsg = ec.message();
}
return true;
}
// Read-write data memory already has the correct permissions
// Some platforms with separate data cache and instruction cache require
// explicit cache flush, otherwise JIT code manipulations (like resolved
// relocations) will get to the data cache but not to the instruction cache.
invalidateInstructionCache();
return false;
}
static sys::MemoryBlock trimBlockToPageSize(sys::MemoryBlock M) {
static const size_t PageSize = sys::Process::getPageSize();
size_t StartOverlap =
(PageSize - ((uintptr_t)M.base() % PageSize)) % PageSize;
size_t TrimmedSize = M.size();
TrimmedSize -= StartOverlap;
TrimmedSize -= TrimmedSize % PageSize;
sys::MemoryBlock Trimmed((void *)((uintptr_t)M.base() + StartOverlap), TrimmedSize);
DCHECK(((uintptr_t)Trimmed.base() % PageSize) == 0);
DCHECK((Trimmed.size() % PageSize) == 0);
DCHECK(M.base() <= Trimmed.base() && Trimmed.size() <= M.size());
return Trimmed;
}
std::error_code
ImpalaMCJITMemoryManager::applyMemoryGroupPermissions(MemoryGroup &MemGroup,
unsigned Permissions) {
for (sys::MemoryBlock &MB : MemGroup.PendingMem)
if (std::error_code EC = sys::Memory::protectMappedMemory(MB, Permissions))
return EC;
MemGroup.PendingMem.clear();
// Now go through free blocks and trim any of them that don't span the entire
// page because one of the pending blocks may have overlapped it.
for (FreeMemBlock &FreeMB : MemGroup.FreeMem) {
FreeMB.Free = trimBlockToPageSize(FreeMB.Free);
// We cleared the PendingMem list, so all these pointers are now invalid
FreeMB.PendingPrefixIndex = (unsigned)-1;
}
// Remove all blocks which are now empty
MemGroup.FreeMem.erase(
remove_if(MemGroup.FreeMem,
[](FreeMemBlock &FreeMB) { return FreeMB.Free.size() == 0; }),
MemGroup.FreeMem.end());
return std::error_code();
}
void ImpalaMCJITMemoryManager::invalidateInstructionCache() {
for (sys::MemoryBlock &Block : CodeMem.PendingMem)
sys::Memory::InvalidateInstructionCache(Block.base(), Block.size());
}
ImpalaMCJITMemoryManager::~ImpalaMCJITMemoryManager() {
for (MemoryGroup *Group : {&CodeMem, &RWDataMem, &RODataMem}) {
for (sys::MemoryBlock &Block : Group->AllocatedMem)
sys::Memory::releaseMappedMemory(Block);
}
}
} // namespace llvm