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/*-------------------------------------------------------------------------
*
* llvmjit.c
* Core part of the LLVM JIT provider.
*
* Copyright (c) 2016-2018, PostgreSQL Global Development Group
*
* IDENTIFICATION
* src/backend/jit/llvm/llvmjit.c
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "jit/llvmjit.h"
#include "miscadmin.h"
#include "utils/memutils.h"
#include "utils/resowner_private.h"
#include "storage/ipc.h"
#include <llvm-c/Target.h>
static bool llvm_session_initialized = false;
static void llvm_release_context(JitContext *context);
static void llvm_session_initialize(void);
static void llvm_shutdown(int code, Datum arg);
PG_MODULE_MAGIC;
/*
* Initialize LLVM JIT provider.
*/
void
_PG_jit_provider_init(JitProviderCallbacks *cb)
{
cb->reset_after_error = llvm_reset_after_error;
cb->release_context = llvm_release_context;
}
/*
* Create a context for JITing work.
*
* The context, including subsidiary resources, will be cleaned up either when
* the context is explicitly released, or when the lifetime of
* CurrentResourceOwner ends (usually the end of the current [sub]xact).
*/
LLVMJitContext *
llvm_create_context(int jitFlags)
{
LLVMJitContext *context;
llvm_assert_in_fatal_section();
llvm_session_initialize();
ResourceOwnerEnlargeJIT(CurrentResourceOwner);
context = MemoryContextAllocZero(TopMemoryContext,
sizeof(LLVMJitContext));
context->base.flags = jitFlags;
/* ensure cleanup */
context->base.resowner = CurrentResourceOwner;
ResourceOwnerRememberJIT(CurrentResourceOwner, PointerGetDatum(context));
return context;
}
/*
* Release resources required by one llvm context.
*/
static void
llvm_release_context(JitContext *context)
{
}
/*
* Per session initialization.
*/
static void
llvm_session_initialize(void)
{
MemoryContext oldcontext;
if (llvm_session_initialized)
return;
oldcontext = MemoryContextSwitchTo(TopMemoryContext);
LLVMInitializeNativeTarget();
LLVMInitializeNativeAsmPrinter();
LLVMInitializeNativeAsmParser();
before_shmem_exit(llvm_shutdown, 0);
llvm_session_initialized = true;
MemoryContextSwitchTo(oldcontext);
}
static void
llvm_shutdown(int code, Datum arg)
{
}
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