ae44418f28
When `unloadBinary` is called, any entries in the JITEngine's cache for that binary will be cleared. This fixes a nasty issue with liboffload program handles. If two handles happen to have had the same address (after one was free'd, for example), the cache would be hit and return the wrong program.
128 lines
4.5 KiB
C++
128 lines
4.5 KiB
C++
//===- JIT.h - Target independent JIT infrastructure ----------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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//===----------------------------------------------------------------------===//
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#ifndef OPENMP_LIBOMPTARGET_PLUGINS_NEXTGEN_COMMON_JIT_H
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#define OPENMP_LIBOMPTARGET_PLUGINS_NEXTGEN_COMMON_JIT_H
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#include "Shared/EnvironmentVar.h"
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#include "Shared/Utils.h"
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#include "llvm/ADT/StringMap.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/Analysis/TargetLibraryInfo.h"
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#include "llvm/IR/LLVMContext.h"
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#include "llvm/IR/Module.h"
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#include "llvm/Support/Error.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/TargetParser/Triple.h"
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#include <functional>
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#include <memory>
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#include <string>
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struct __tgt_device_image;
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namespace llvm {
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class MemoryBuffer;
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namespace omp {
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namespace target {
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namespace plugin {
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struct GenericDeviceTy;
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} // namespace plugin
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/// The JIT infrastructure and caching mechanism.
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struct JITEngine {
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/// Function type for a callback that will be called after the backend is
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/// called.
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using PostProcessingFn =
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std::function<Expected<std::unique_ptr<MemoryBuffer>>(
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std::unique_ptr<MemoryBuffer>)>;
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JITEngine(Triple::ArchType TA);
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/// Run jit compilation if \p Image is a bitcode image, otherwise simply
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/// return \p Image. It is expected to return a memory buffer containing the
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/// generated device image that could be loaded to the device directly.
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Expected<const __tgt_device_image *>
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process(const __tgt_device_image &Image,
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target::plugin::GenericDeviceTy &Device);
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/// Remove \p Image from the jit engine's cache
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void erase(const __tgt_device_image &Image,
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target::plugin::GenericDeviceTy &Device);
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private:
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/// Compile the bitcode image \p Image and generate the binary image that can
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/// be loaded to the target device of the triple \p Triple architecture \p
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/// MCpu. \p PostProcessing will be called after codegen to handle cases such
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/// as assembler as an external tool.
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Expected<const __tgt_device_image *>
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compile(const __tgt_device_image &Image, const std::string &ComputeUnitKind,
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PostProcessingFn PostProcessing);
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/// Create or retrieve the object image file from the file system or via
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/// compilation of the \p Image.
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Expected<std::unique_ptr<MemoryBuffer>>
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getOrCreateObjFile(const __tgt_device_image &Image, LLVMContext &Ctx,
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const std::string &ComputeUnitKind);
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/// Run backend, which contains optimization and code generation.
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Expected<std::unique_ptr<MemoryBuffer>>
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backend(Module &M, const std::string &ComputeUnitKind, unsigned OptLevel);
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/// Run optimization pipeline.
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void opt(TargetMachine *TM, TargetLibraryInfoImpl *TLII, Module &M,
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unsigned OptLevel);
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/// Run code generation.
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void codegen(TargetMachine *TM, TargetLibraryInfoImpl *TLII, Module &M,
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raw_pwrite_stream &OS);
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/// The target triple used by the JIT.
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const Triple TT;
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struct ComputeUnitInfo {
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/// LLVM Context in which the modules will be constructed.
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LLVMContext Context;
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/// A map of embedded IR images to the buffer used to store JITed code
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DenseMap<const __tgt_device_image *, std::unique_ptr<MemoryBuffer>>
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JITImages;
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/// A map of embedded IR images to JITed images.
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DenseMap<const __tgt_device_image *, std::unique_ptr<__tgt_device_image>>
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TgtImageMap;
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};
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/// Map from (march) "CPUs" (e.g., sm_80, or gfx90a), which we call compute
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/// units as they are not CPUs, to the image information we cached for them.
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StringMap<ComputeUnitInfo> ComputeUnitMap;
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std::mutex ComputeUnitMapMutex;
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/// Control environment variables.
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StringEnvar ReplacementObjectFileName =
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StringEnvar("LIBOMPTARGET_JIT_REPLACEMENT_OBJECT");
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StringEnvar ReplacementModuleFileName =
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StringEnvar("LIBOMPTARGET_JIT_REPLACEMENT_MODULE");
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StringEnvar PreOptIRModuleFileName =
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StringEnvar("LIBOMPTARGET_JIT_PRE_OPT_IR_MODULE");
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StringEnvar PostOptIRModuleFileName =
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StringEnvar("LIBOMPTARGET_JIT_POST_OPT_IR_MODULE");
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UInt32Envar JITOptLevel = UInt32Envar("LIBOMPTARGET_JIT_OPT_LEVEL", 3);
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BoolEnvar JITSkipOpt = BoolEnvar("LIBOMPTARGET_JIT_SKIP_OPT", false);
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};
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} // namespace target
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} // namespace omp
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} // namespace llvm
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#endif // OPENMP_LIBOMPTARGET_PLUGINS_NEXTGEN_COMMON_JIT_H
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