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 
24 namespace llvm {
25 namespace orc {
26 
27 IRMaterializationUnit::ManglingOptions
28 irManglingOptionsFromTargetOptions(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.
37 Expected<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 
67 SimpleCompiler::CompileResult
68 SimpleCompiler::tryToLoadFromObjectCache(const Module &M) {
69   if (!ObjCache)
70     return CompileResult();
71 
72   return ObjCache->getObject(&M);
73 }
74 
75 void SimpleCompiler::notifyObjectCompiled(const Module &M,
76                                           const MemoryBuffer &ObjBuffer) {
77   if (ObjCache)
78     ObjCache->notifyObjectCompiled(&M, ObjBuffer.getMemBufferRef());
79 }
80 
81 ConcurrentIRCompiler::ConcurrentIRCompiler(JITTargetMachineBuilder JTMB,
82                                            ObjectCache *ObjCache)
83     : IRCompiler(irManglingOptionsFromTargetOptions(JTMB.getOptions())),
84       JTMB(std::move(JTMB)), ObjCache(ObjCache) {}
85 
86 Expected<std::unique_ptr<MemoryBuffer>>
87 ConcurrentIRCompiler::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