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