1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
| //===-- examples/clang-interpreter/main.cpp - Clang C Interpreter Example -===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "clang/Basic/DiagnosticOptions.h"
#include "clang/CodeGen/CodeGenAction.h"
#include "clang/Driver/Compilation.h"
#include "clang/Driver/Driver.h"
#include "clang/Driver/Tool.h"
#include "clang/Frontend/CompilerInstance.h"
#include "clang/Frontend/CompilerInvocation.h"
#include "clang/Frontend/FrontendDiagnostic.h"
#include "clang/Frontend/TextDiagnosticPrinter.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ExecutionEngine/ExecutionEngine.h"
#include "llvm/ExecutionEngine/Orc/CompileUtils.h"
#include "llvm/ExecutionEngine/Orc/ExecutionUtils.h"
#include "llvm/ExecutionEngine/Orc/IRCompileLayer.h"
#include "llvm/ExecutionEngine/Orc/RTDyldObjectLinkingLayer.h"
#include "llvm/ExecutionEngine/SectionMemoryManager.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/Mangler.h"
#include "llvm/IR/Module.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/Host.h"
#include "llvm/Support/ManagedStatic.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/TargetSelect.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetMachine.h"
using namespace clang;
using namespace clang::driver;
// This function isn't referenced outside its translation unit, but it
// can't use the "static" keyword because its address is used for
// GetMainExecutable (since some platforms don't support taking the
// address of main, and some platforms can't implement GetMainExecutable
// without being given the address of a function in the main executable).
std::string GetExecutablePath(const char *Argv0, void *MainAddr) {
return llvm::sys::fs::getMainExecutable(Argv0, MainAddr);
}
namespace llvm {
namespace orc {
class SimpleJIT {
private:
ExecutionSession ES;
std::unique_ptr<TargetMachine> TM;
const DataLayout DL;
MangleAndInterner Mangle{ES, DL};
RTDyldObjectLinkingLayer ObjectLayer{ES, createMemMgr};
IRCompileLayer CompileLayer{ES, ObjectLayer, SimpleCompiler(*TM)};
static std::unique_ptr<SectionMemoryManager> createMemMgr() {
return std::make_unique<SectionMemoryManager>();
}
SimpleJIT(
std::unique_ptr<TargetMachine> TM, DataLayout DL,
std::unique_ptr<DynamicLibrarySearchGenerator> ProcessSymbolsGenerator)
: TM(std::move(TM)), DL(std::move(DL)) {
llvm::sys::DynamicLibrary::LoadLibraryPermanently(nullptr);
ES.getMainJITDylib().addGenerator(std::move(ProcessSymbolsGenerator));
}
public:
static Expected<std::unique_ptr<SimpleJIT>> Create() {
auto JTMB = JITTargetMachineBuilder::detectHost();
if (!JTMB)
return JTMB.takeError();
auto TM = JTMB->createTargetMachine();
if (!TM)
return TM.takeError();
auto DL = (*TM)->createDataLayout();
auto ProcessSymbolsGenerator =
DynamicLibrarySearchGenerator::GetForCurrentProcess(
DL.getGlobalPrefix());
if (!ProcessSymbolsGenerator)
return ProcessSymbolsGenerator.takeError();
return std::unique_ptr<SimpleJIT>(new SimpleJIT(
std::move(*TM), std::move(DL), std::move(*ProcessSymbolsGenerator)));
}
const TargetMachine &getTargetMachine() const { return *TM; }
Error addModule(ThreadSafeModule M) {
return CompileLayer.add(ES.getMainJITDylib(), std::move(M));
}
Expected<JITEvaluatedSymbol> findSymbol(const StringRef &Name) {
return ES.lookup({&ES.getMainJITDylib()}, Mangle(Name));
}
Expected<JITTargetAddress> getSymbolAddress(const StringRef &Name) {
auto Sym = findSymbol(Name);
if (!Sym)
return Sym.takeError();
return Sym->getAddress();
}
};
} // end namespace orc
} // end namespace llvm
llvm::ExitOnError ExitOnErr;
int main(int argc, const char **argv) {
// This just needs to be some symbol in the binary; C++ doesn't
// allow taking the address of ::main however.
void *MainAddr = (void*) (intptr_t) GetExecutablePath;
std::string Path = GetExecutablePath(argv[0], MainAddr);
IntrusiveRefCntPtr<DiagnosticOptions> DiagOpts = new DiagnosticOptions();
TextDiagnosticPrinter *DiagClient =
new TextDiagnosticPrinter(llvm::errs(), &*DiagOpts);
IntrusiveRefCntPtr<DiagnosticIDs> DiagID(new DiagnosticIDs());
DiagnosticsEngine Diags(DiagID, &*DiagOpts, DiagClient);
const std::string TripleStr = llvm::sys::getProcessTriple();
llvm::Triple T(TripleStr);
// Use ELF on Windows-32 and MingW for now.
#ifndef CLANG_INTERPRETER_COFF_FORMAT
if (T.isOSBinFormatCOFF())
T.setObjectFormat(llvm::Triple::ELF);
#endif
ExitOnErr.setBanner("clang interpreter");
Driver TheDriver(Path, T.str(), Diags);
TheDriver.setTitle("clang interpreter");
TheDriver.setCheckInputsExist(false);
// FIXME: This is a hack to try to force the driver to do something we can
// recognize. We need to extend the driver library to support this use model
// (basically, exactly one input, and the operation mode is hard wired).
SmallVector<const char *, 16> Args(argv, argv + argc);
Args.push_back("-fsyntax-only");
std::unique_ptr<Compilation> C(TheDriver.BuildCompilation(Args));
if (!C)
return 0;
// FIXME: This is copied from ASTUnit.cpp; simplify and eliminate.
// We expect to get back exactly one command job, if we didn't something
// failed. Extract that job from the compilation.
const driver::JobList &Jobs = C->getJobs();
if (Jobs.size() != 1 || !isa<driver::Command>(*Jobs.begin())) {
SmallString<256> Msg;
llvm::raw_svector_ostream OS(Msg);
Jobs.Print(OS, "; ", true);
Diags.Report(diag::err_fe_expected_compiler_job) << OS.str();
return 1;
}
const driver::Command &Cmd = cast<driver::Command>(*Jobs.begin());
if (llvm::StringRef(Cmd.getCreator().getName()) != "clang") {
Diags.Report(diag::err_fe_expected_clang_command);
return 1;
}
// Initialize a compiler invocation object from the clang (-cc1) arguments.
const llvm::opt::ArgStringList &CCArgs = Cmd.getArguments();
std::unique_ptr<CompilerInvocation> CI(new CompilerInvocation);
CompilerInvocation::CreateFromArgs(*CI, CCArgs, Diags);
// Show the invocation, with -v.
if (CI->getHeaderSearchOpts().Verbose) {
llvm::errs() << "clang invocation:\n";
Jobs.Print(llvm::errs(), "\n", true);
llvm::errs() << "\n";
}
// FIXME: This is copied from cc1_main.cpp; simplify and eliminate.
// Create a compiler instance to handle the actual work.
CompilerInstance Clang;
Clang.setInvocation(std::move(CI));
// Create the compilers actual diagnostics engine.
Clang.createDiagnostics();
if (!Clang.hasDiagnostics())
return 1;
// Infer the builtin include path if unspecified.
if (Clang.getHeaderSearchOpts().UseBuiltinIncludes &&
Clang.getHeaderSearchOpts().ResourceDir.empty())
Clang.getHeaderSearchOpts().ResourceDir =
CompilerInvocation::GetResourcesPath(argv[0], MainAddr);
// Create and execute the frontend to generate an LLVM bitcode module.
std::unique_ptr<CodeGenAction> Act(new EmitLLVMOnlyAction());
if (!Clang.ExecuteAction(*Act))
return 1;
llvm::InitializeNativeTarget();
llvm::InitializeNativeTargetAsmPrinter();
int Res = 255;
std::unique_ptr<llvm::LLVMContext> Ctx(Act->takeLLVMContext());
std::unique_ptr<llvm::Module> Module = Act->takeModule();
if (Module) {
auto J = ExitOnErr(llvm::orc::SimpleJIT::Create());
ExitOnErr(J->addModule(
llvm::orc::ThreadSafeModule(std::move(Module), std::move(Ctx))));
auto Main = (int (*)(...))ExitOnErr(J->getSymbolAddress("main"));
Res = Main();
}
// Shutdown.
llvm::llvm_shutdown();
return Res;
}
|