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CHJIT custom memory manager

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This commit is contained in:
Maksim Kita 2021-08-27 13:35:07 +03:00
parent fc37817ada
commit 2e4da05708
1 changed files with 117 additions and 7 deletions
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124
src/Interpreters/JIT/CHJIT.cpp
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@ -2,6 +2,8 @@
#if USE_EMBEDDED_COMPILER
#include <sys/mman.h>
#include <llvm/Analysis/TargetTransformInfo.h>
#include <llvm/IR/BasicBlock.h>
#include <llvm/IR/DataLayout.h>
@ -22,7 +24,10 @@
#include <llvm/Transforms/IPO/PassManagerBuilder.h>
#include <llvm/Support/SmallVectorMemoryBuffer.h>
#include <common/getPageSize.h>
#include <Common/Exception.h>
#include <Common/formatReadable.h>
namespace DB
{
@ -31,6 +36,8 @@ namespace ErrorCodes
{
extern const int CANNOT_COMPILE_CODE;
extern const int LOGICAL_ERROR;
extern const int CANNOT_ALLOCATE_MEMORY;
extern const int CANNOT_MPROTECT;
}
/** Simple module to object file compiler.
@ -113,25 +120,128 @@ class JITModuleMemoryManager
{
public:
llvm::sys::MemoryBlock allocateMappedMemory(
llvm::SectionMemoryManager::AllocationPurpose Purpose [[maybe_unused]],
llvm::SectionMemoryManager::AllocationPurpose,
size_t NumBytes,
const llvm::sys::MemoryBlock * const NearBlock,
const llvm::sys::MemoryBlock * const,
unsigned Flags,
std::error_code & EC) override
{
auto allocated_memory_block = llvm::sys::Memory::allocateMappedMemory(NumBytes, NearBlock, Flags, EC);
allocated_size += allocated_memory_block.allocatedSize();
return allocated_memory_block;
EC = std::error_code();
if (NumBytes == 0)
return llvm::sys::MemoryBlock();
int protection_flags = getPosixProtectionFlags(Flags);
#if defined(__NetBSD__) && defined(PROT_MPROTECT)
protection_flags |= PROT_MPROTECT(PROT_READ | PROT_WRITE | PROT_EXEC);
#endif
auto page_size = getPageSize();
auto num_pages = (NumBytes + page_size - 1) / page_size;
auto allocate_size = num_pages * page_size;
void * buf = nullptr;
int res = posix_memalign(&buf, page_size, allocate_size);
if (res != 0)
throwFromErrno(fmt::format("Cannot allocate memory (posix_memalign) alignment {} size {}.",
page_size,
ReadableSize(allocate_size)),
ErrorCodes::CANNOT_ALLOCATE_MEMORY,
res);
auto result = llvm::sys::MemoryBlock(buf, allocate_size);
protectBlock(result, protection_flags);
allocated_size += result.allocatedSize();
return result;
}
std::error_code protectMappedMemory(const llvm::sys::MemoryBlock & Block, unsigned Flags) override
{
return llvm::sys::Memory::protectMappedMemory(Block, Flags);
int protection_flags = getPosixProtectionFlags(Flags);
bool invalidate_cache = (Flags & llvm::sys::Memory::MF_EXEC);
#if defined(__arm__) || defined(__aarch64__)
// Certain ARM implementations treat icache clear instruction as a memory read,
// and CPU segfaults on trying to clear cache on !PROT_READ page. Therefore we need
// to temporarily add PROT_READ for the sake of flushing the instruction caches.
if (invalidate_cache && !(protection_flags & PROT_READ)) {
protectBlock(Block, protection_flags | PROT_READ);
Memory::InvalidateInstructionCache(M.Address, M.AllocatedSize);
InvalidateCache = false;
}
#endif
protectBlock(Block, protection_flags);
if (invalidate_cache)
llvm::sys::Memory::InvalidateInstructionCache(Block.base(), Block.allocatedSize());
return std::error_code();
}
std::error_code releaseMappedMemory(llvm::sys::MemoryBlock & M) override { return llvm::sys::Memory::releaseMappedMemory(M); }
std::error_code releaseMappedMemory(llvm::sys::MemoryBlock & M) override
{
if (M.base() == nullptr || M.allocatedSize() == 0)
return std::error_code();
protectBlock(M, PROT_READ | PROT_WRITE);
free(M.base());
allocated_size -= M.allocatedSize();
return std::error_code();
}
size_t allocated_size = 0;
private:
static void protectBlock(const llvm::sys::MemoryBlock & block, int protection_flags)
{
int res = ::mprotect(block.base(), block.allocatedSize(), protection_flags);
if (res != 0)
throwFromErrno(fmt::format("Cannot protect memory (m_protect) alignment {} size {}.",
block.base(),
block.allocatedSize()),
ErrorCodes::CANNOT_MPROTECT,
res);
}
static int getPosixProtectionFlags(unsigned flags)
{
switch (flags & llvm::sys::Memory::MF_RWE_MASK)
{
case llvm::sys::Memory::MF_READ:
return PROT_READ;
case llvm::sys::Memory::MF_WRITE:
return PROT_WRITE;
case llvm::sys::Memory::MF_READ | llvm::sys::Memory::MF_WRITE:
return PROT_READ | PROT_WRITE;
case llvm::sys::Memory::MF_READ | llvm::sys::Memory::MF_EXEC:
return PROT_READ | PROT_EXEC;
case llvm::sys::Memory::MF_READ | llvm::sys::Memory::MF_WRITE |
llvm::sys::Memory::MF_EXEC:
return PROT_READ | PROT_WRITE | PROT_EXEC;
case llvm::sys::Memory::MF_EXEC:
#if (defined(__FreeBSD__) || defined(__POWERPC__) || defined (__ppc__) || \
defined(_POWER) || defined(_ARCH_PPC))
// On PowerPC, having an executable page that has no read permission
// can have unintended consequences. The function InvalidateInstruction-
// Cache uses instructions dcbf and icbi, both of which are treated by
// the processor as loads. If the page has no read permissions,
// executing these instructions will result in a segmentation fault.
return PROT_READ | PROT_EXEC;
#else
return PROT_EXEC;
#endif
default:
__builtin_unreachable();
}
// Provide a default return value as required by some compilers.
return PROT_NONE;
}
};
public: