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
|
//===-- examples/clang-interpreter/main.cpp - Clang C Interpreter Example -===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "clang/CodeGen/CodeGenAction.h"
#include "clang/Driver/Compilation.h"
#include "clang/Driver/Driver.h"
#include "clang/Driver/Tool.h"
#include "clang/Frontend/CompilerInvocation.h"
#include "clang/Frontend/CompilerInstance.h"
#include "clang/Frontend/DiagnosticOptions.h"
#include "clang/Frontend/FrontendDiagnostic.h"
#include "clang/Frontend/TextDiagnosticPrinter.h"
#include "llvm/Module.h"
#include "llvm/ADT/OwningPtr.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ExecutionEngine/JIT.h"
#include "llvm/ExecutionEngine/ExecutionEngine.h"
#include "llvm/Support/ManagedStatic.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Support/Host.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/TargetSelect.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).
llvm::sys::Path GetExecutablePath(const char *Argv0) {
// 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;
return llvm::sys::Path::GetMainExecutable(Argv0, MainAddr);
}
static int Execute(llvm::Module *Mod, char * const *envp) {
llvm::InitializeNativeTarget();
std::string Error;
OwningPtr<llvm::ExecutionEngine> EE(
llvm::ExecutionEngine::createJIT(Mod, &Error));
if (!EE) {
llvm::errs() << "unable to make execution engine: " << Error << "\n";
return 255;
}
llvm::Function *EntryFn = Mod->getFunction("main");
if (!EntryFn) {
llvm::errs() << "'main' function not found in module.\n";
return 255;
}
// FIXME: Support passing arguments.
std::vector<std::string> Args;
Args.push_back(Mod->getModuleIdentifier());
return EE->runFunctionAsMain(EntryFn, Args, envp);
}
int main(int argc, const char **argv, char * const *envp) {
void *MainAddr = (void*) (intptr_t) GetExecutablePath;
llvm::sys::Path Path = GetExecutablePath(argv[0]);
TextDiagnosticPrinter *DiagClient =
new TextDiagnosticPrinter(llvm::errs(), DiagnosticOptions());
llvm::IntrusiveRefCntPtr<DiagnosticIDs> DiagID(new DiagnosticIDs());
DiagnosticsEngine Diags(DiagID, DiagClient);
Driver TheDriver(Path.str(), llvm::sys::getDefaultTargetTriple(),
"a.out", /*IsProduction=*/false, Diags);
TheDriver.setTitle("clang interpreter");
// 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).
llvm::SmallVector<const char *, 16> Args(argv, argv + argc);
Args.push_back("-fsyntax-only");
OwningPtr<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())) {
llvm::SmallString<256> Msg;
llvm::raw_svector_ostream OS(Msg);
C->PrintJob(OS, C->getJobs(), "; ", 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 driver::ArgStringList &CCArgs = Cmd->getArguments();
OwningPtr<CompilerInvocation> CI(new CompilerInvocation);
CompilerInvocation::CreateFromArgs(*CI,
const_cast<const char **>(CCArgs.data()),
const_cast<const char **>(CCArgs.data()) +
CCArgs.size(),
Diags);
// Show the invocation, with -v.
if (CI->getHeaderSearchOpts().Verbose) {
llvm::errs() << "clang invocation:\n";
C->PrintJob(llvm::errs(), C->getJobs(), "\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(CI.take());
// Create the compilers actual diagnostics engine.
Clang.createDiagnostics(int(CCArgs.size()),const_cast<char**>(CCArgs.data()));
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.
OwningPtr<CodeGenAction> Act(new EmitLLVMOnlyAction());
if (!Clang.ExecuteAction(*Act))
return 1;
int Res = 255;
if (llvm::Module *Module = Act->takeModule())
Res = Execute(Module, envp);
// Shutdown.
llvm::llvm_shutdown();
return Res;
}
|
