1//===------ CompileUtils.cpp - Utilities for compiling IR in the JIT ------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#include "llvm/ExecutionEngine/Orc/CompileUtils.h"
10
11#include "llvm/ADT/SmallVector.h"
12#include "llvm/ExecutionEngine/ObjectCache.h"
13#include "llvm/IR/LegacyPassManager.h"
14#include "llvm/IR/Module.h"
15#include "llvm/Object/ObjectFile.h"
16#include "llvm/Support/Error.h"
17#include "llvm/Support/ErrorHandling.h"
18#include "llvm/Support/MemoryBuffer.h"
19#include "llvm/Support/SmallVectorMemoryBuffer.h"
20#include "llvm/Target/TargetMachine.h"
21
22#include <algorithm>
23
24namespace llvm {
25namespace orc {
26
27IRMaterializationUnit::ManglingOptions
28irManglingOptionsFromTargetOptions(const TargetOptions &Opts) {
29  IRMaterializationUnit::ManglingOptions MO;
30
31  MO.EmulatedTLS = Opts.EmulatedTLS;
32
33  return MO;
34}
35
36/// Compile a Module to an ObjectFile.
37Expected<SimpleCompiler::CompileResult> SimpleCompiler::operator()(Module &M) {
38  CompileResult CachedObject = tryToLoadFromObjectCache(M);
39  if (CachedObject)
40    return std::move(CachedObject);
41
42  SmallVector<char, 0> ObjBufferSV;
43
44  {
45    raw_svector_ostream ObjStream(ObjBufferSV);
46
47    legacy::PassManager PM;
48    MCContext *Ctx;
49    if (TM.addPassesToEmitMC(PM, Ctx, ObjStream))
50      return make_error<StringError>("Target does not support MC emission",
51                                     inconvertibleErrorCode());
52    PM.run(M);
53  }
54
55  auto ObjBuffer = std::make_unique<SmallVectorMemoryBuffer>(
56      std::move(ObjBufferSV), M.getModuleIdentifier() + "-jitted-objectbuffer");
57
58  auto Obj = object::ObjectFile::createObjectFile(ObjBuffer->getMemBufferRef());
59
60  if (!Obj)
61    return Obj.takeError();
62
63  notifyObjectCompiled(M, *ObjBuffer);
64  return std::move(ObjBuffer);
65}
66
67SimpleCompiler::CompileResult
68SimpleCompiler::tryToLoadFromObjectCache(const Module &M) {
69  if (!ObjCache)
70    return CompileResult();
71
72  return ObjCache->getObject(&M);
73}
74
75void SimpleCompiler::notifyObjectCompiled(const Module &M,
76                                          const MemoryBuffer &ObjBuffer) {
77  if (ObjCache)
78    ObjCache->notifyObjectCompiled(&M, ObjBuffer.getMemBufferRef());
79}
80
81ConcurrentIRCompiler::ConcurrentIRCompiler(JITTargetMachineBuilder JTMB,
82                                           ObjectCache *ObjCache)
83    : IRCompiler(irManglingOptionsFromTargetOptions(JTMB.getOptions())),
84      JTMB(std::move(JTMB)), ObjCache(ObjCache) {}
85
86Expected<std::unique_ptr<MemoryBuffer>>
87ConcurrentIRCompiler::operator()(Module &M) {
88  auto TM = cantFail(JTMB.createTargetMachine());
89  SimpleCompiler C(*TM, ObjCache);
90  return C(M);
91}
92
93} // end namespace orc
94} // end namespace llvm
95