167 lines
5.5 KiB
C++
167 lines
5.5 KiB
C++
/* -*- C++ -*-
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* Serene Programming Language
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*
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* Copyright (c) 2019-2021 Sameer Rahmani <lxsameer@gnu.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, version 2.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* Commentary:
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*/
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#ifndef SERENE_JIT_H
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#define SERENE_JIT_H
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#include "serene/errors.h"
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#include "serene/export.h"
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#include "serene/slir/generatable.h"
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#include "serene/utils.h"
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#include <llvm/ADT/StringRef.h>
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#include <llvm/ExecutionEngine/JITEventListener.h>
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#include <llvm/ExecutionEngine/ObjectCache.h>
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#include <llvm/ExecutionEngine/Orc/LLJIT.h>
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#include <llvm/Support/CodeGen.h>
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#include <llvm/Support/Debug.h>
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#include <memory>
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#include <mlir/Support/LLVM.h>
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#define JIT_LOG(...) \
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DEBUG_WITH_TYPE("JIT", llvm::dbgs() << "[JIT]: " << __VA_ARGS__ << "\n");
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namespace serene {
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class SERENE_EXPORT JIT;
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using MaybeJIT = llvm::Optional<std::unique_ptr<JIT>>;
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/// A simple object cache following Lang's LLJITWithObjectCache example and
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/// MLIR's SimpelObjectCache.
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class ObjectCache : public llvm::ObjectCache {
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public:
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/// Cache the given `objBuffer` for the given module `m`. The buffer contains
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/// the combiled objects of the module
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void notifyObjectCompiled(const llvm::Module *m,
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llvm::MemoryBufferRef objBuffer) override;
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// Lookup the cache for the given module `m` or returen a nullptr.
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std::unique_ptr<llvm::MemoryBuffer> getObject(const llvm::Module *m) override;
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/// Dump cached object to output file `filename`.
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void dumpToObjectFile(llvm::StringRef filename);
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private:
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llvm::StringMap<std::unique_ptr<llvm::MemoryBuffer>> cachedObjects;
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};
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class JIT {
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// TODO: Should the JIT own the context ???
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Namespace &ns;
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std::unique_ptr<llvm::orc::LLJIT> engine;
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std::unique_ptr<ObjectCache> cache;
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/// GDB notification listener.
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llvm::JITEventListener *gdbListener;
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/// Perf notification listener.
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llvm::JITEventListener *perfListener;
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public:
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JIT(Namespace &ns, bool enableObjectCache = true,
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bool enableGDBNotificationListener = true,
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bool enablePerfNotificationListener = true);
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static MaybeJIT
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make(Namespace &ns, mlir::ArrayRef<llvm::StringRef> sharedLibPaths = {},
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mlir::Optional<llvm::CodeGenOpt::Level> jitCodeGenOptLevel = llvm::None,
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bool enableObjectCache = true, bool enableGDBNotificationListener = true,
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bool enablePerfNotificationListener = true);
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/// Looks up a packed-argument function with the given name and returns a
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/// pointer to it. Propagates errors in case of failure.
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llvm::Expected<void (*)(void **)> lookup(llvm::StringRef name) const;
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/// Invokes the function with the given name passing it the list of opaque
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/// pointers to the actual arguments.
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llvm::Error invokePacked(llvm::StringRef name,
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llvm::MutableArrayRef<void *> args = llvm::None);
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/// Trait that defines how a given type is passed to the JIT code. This
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/// defaults to passing the address but can be specialized.
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template <typename T>
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struct Argument {
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static void pack(llvm::SmallVectorImpl<void *> &args, T &val) {
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args.push_back(&val);
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}
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};
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/// Tag to wrap an output parameter when invoking a jitted function.
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template <typename T>
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struct FnResult {
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FnResult(T &result) : value(result) {}
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T &value;
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};
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/// Helper function to wrap an output operand when using
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/// ExecutionEngine::invoke.
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template <typename T>
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static FnResult<T> result(T &t) {
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return FnResult<T>(t);
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}
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// Specialization for output parameter: their address is forwarded directly to
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// the native code.
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template <typename T>
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struct Argument<Result<T>> {
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static void pack(llvm::SmallVectorImpl<void *> &args, FnResult<T> &result) {
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args.push_back(&result.value);
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}
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};
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/// Invokes the function with the given name passing it the list of arguments
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/// by value. Function result can be obtain through output parameter using the
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/// `FnResult` wrapper defined above. For example:
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///
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/// func @foo(%arg0 : i32) -> i32 attributes { llvm.emit_c_interface }
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///
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/// can be invoked:
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///
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/// int32_t result = 0;
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/// llvm::Error error = jit->invoke("foo", 42,
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/// result(result));
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template <typename... Args>
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llvm::Error invoke(llvm::StringRef funcName, Args... args) {
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const std::string adapterName = std::string("") + funcName.str();
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llvm::SmallVector<void *> argsArray;
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// Pack every arguments in an array of pointers. Delegate the packing to a
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// trait so that it can be overridden per argument type.
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// TODO: replace with a fold expression when migrating to C++17.
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int dummy[] = {0, ((void)Argument<Args>::pack(argsArray, args), 0)...};
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(void)dummy;
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return invokePacked(adapterName, argsArray);
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};
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/// Dump object code to output file `filename`.
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void dumpToObjectFile(llvm::StringRef filename);
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/// Register symbols with this ExecutionEngine.
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void registerSymbols(
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llvm::function_ref<llvm::orc::SymbolMap(llvm::orc::MangleAndInterner)>
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symbolMap);
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};
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} // namespace serene
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#endif
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