1 //===-- cc1_main.cpp - Clang CC1 Compiler Frontend ------------------------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This is the entry point to the clang -cc1 functionality, which implements the
11 // core compiler functionality along with a number of additional tools for
12 // demonstration and testing purposes.
13 //
14 //===----------------------------------------------------------------------===//
15
16 #include "llvm/Option/Arg.h"
17 #include "clang/Driver/DriverDiagnostic.h"
18 #include "clang/Driver/Options.h"
19 #include "clang/Frontend/CompilerInstance.h"
20 #include "clang/Frontend/CompilerInvocation.h"
21 #include "clang/Frontend/FrontendDiagnostic.h"
22 #include "clang/Frontend/TextDiagnosticBuffer.h"
23 #include "clang/Frontend/TextDiagnosticPrinter.h"
24 #include "clang/Frontend/Utils.h"
25 #include "clang/FrontendTool/Utils.h"
26 #include "llvm/ADT/Statistic.h"
27 #include "llvm/LinkAllPasses.h"
28 #include "llvm/Option/ArgList.h"
29 #include "llvm/Option/OptTable.h"
30 #include "llvm/Support/ErrorHandling.h"
31 #include "llvm/Support/ManagedStatic.h"
32 #include "llvm/Support/Signals.h"
33 #include "llvm/Support/TargetSelect.h"
34 #include "llvm/Support/Timer.h"
35 #include "llvm/Support/raw_ostream.h"
36 #include <cstdio>
37 using namespace clang;
38 using namespace llvm::opt;
39
40 //===----------------------------------------------------------------------===//
41 // Main driver
42 //===----------------------------------------------------------------------===//
43
LLVMErrorHandler(void * UserData,const std::string & Message,bool GenCrashDiag)44 static void LLVMErrorHandler(void *UserData, const std::string &Message,
45 bool GenCrashDiag) {
46 DiagnosticsEngine &Diags = *static_cast<DiagnosticsEngine*>(UserData);
47
48 Diags.Report(diag::err_fe_error_backend) << Message;
49
50 // Run the interrupt handlers to make sure any special cleanups get done, in
51 // particular that we remove files registered with RemoveFileOnSignal.
52 llvm::sys::RunInterruptHandlers();
53
54 // We cannot recover from llvm errors. When reporting a fatal error, exit
55 // with status 70 to generate crash diagnostics. For BSD systems this is
56 // defined as an internal software error. Otherwise, exit with status 1.
57 exit(GenCrashDiag ? 70 : 1);
58 }
59
60 #ifdef LINK_POLLY_INTO_TOOLS
61 namespace polly {
62 void initializePollyPasses(llvm::PassRegistry &Registry);
63 }
64 #endif
65
cc1_main(const char ** ArgBegin,const char ** ArgEnd,const char * Argv0,void * MainAddr)66 int cc1_main(const char **ArgBegin, const char **ArgEnd,
67 const char *Argv0, void *MainAddr) {
68 std::unique_ptr<CompilerInstance> Clang(new CompilerInstance());
69 IntrusiveRefCntPtr<DiagnosticIDs> DiagID(new DiagnosticIDs());
70
71 // Initialize targets first, so that --version shows registered targets.
72 llvm::InitializeAllTargets();
73 llvm::InitializeAllTargetMCs();
74 llvm::InitializeAllAsmPrinters();
75 llvm::InitializeAllAsmParsers();
76
77 #ifdef LINK_POLLY_INTO_TOOLS
78 llvm::PassRegistry &Registry = *llvm::PassRegistry::getPassRegistry();
79 polly::initializePollyPasses(Registry);
80 #endif
81
82 // Buffer diagnostics from argument parsing so that we can output them using a
83 // well formed diagnostic object.
84 IntrusiveRefCntPtr<DiagnosticOptions> DiagOpts = new DiagnosticOptions();
85 TextDiagnosticBuffer *DiagsBuffer = new TextDiagnosticBuffer;
86 DiagnosticsEngine Diags(DiagID, &*DiagOpts, DiagsBuffer);
87 bool Success;
88 Success = CompilerInvocation::CreateFromArgs(Clang->getInvocation(),
89 ArgBegin, ArgEnd, Diags);
90
91 // Infer the builtin include path if unspecified.
92 if (Clang->getHeaderSearchOpts().UseBuiltinIncludes &&
93 Clang->getHeaderSearchOpts().ResourceDir.empty())
94 Clang->getHeaderSearchOpts().ResourceDir =
95 CompilerInvocation::GetResourcesPath(Argv0, MainAddr);
96
97 // Create the actual diagnostics engine.
98 Clang->createDiagnostics();
99 if (!Clang->hasDiagnostics())
100 return 1;
101
102 // Set an error handler, so that any LLVM backend diagnostics go through our
103 // error handler.
104 llvm::install_fatal_error_handler(LLVMErrorHandler,
105 static_cast<void*>(&Clang->getDiagnostics()));
106
107 DiagsBuffer->FlushDiagnostics(Clang->getDiagnostics());
108 if (!Success)
109 return 1;
110
111 // Execute the frontend actions.
112 Success = ExecuteCompilerInvocation(Clang.get());
113
114 // If any timers were active but haven't been destroyed yet, print their
115 // results now. This happens in -disable-free mode.
116 llvm::TimerGroup::printAll(llvm::errs());
117
118 // Our error handler depends on the Diagnostics object, which we're
119 // potentially about to delete. Uninstall the handler now so that any
120 // later errors use the default handling behavior instead.
121 llvm::remove_fatal_error_handler();
122
123 // When running with -disable-free, don't do any destruction or shutdown.
124 if (Clang->getFrontendOpts().DisableFree) {
125 if (llvm::AreStatisticsEnabled() || Clang->getFrontendOpts().ShowStats)
126 llvm::PrintStatistics();
127 BuryPointer(Clang.release());
128 return !Success;
129 }
130
131 // Managed static deconstruction. Useful for making things like
132 // -time-passes usable.
133 llvm::llvm_shutdown();
134
135 return !Success;
136 }
137