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/CodeGen/ObjectFilePCHContainerOperations.h"
18 #include "clang/Driver/DriverDiagnostic.h"
19 #include "clang/Driver/Options.h"
20 #include "clang/Frontend/CompilerInstance.h"
21 #include "clang/Frontend/CompilerInvocation.h"
22 #include "clang/Frontend/FrontendDiagnostic.h"
23 #include "clang/Frontend/TextDiagnosticBuffer.h"
24 #include "clang/Frontend/TextDiagnosticPrinter.h"
25 #include "clang/Frontend/Utils.h"
26 #include "clang/FrontendTool/Utils.h"
27 #include "llvm/ADT/Statistic.h"
28 #include "llvm/LinkAllPasses.h"
29 #include "llvm/Option/ArgList.h"
30 #include "llvm/Option/OptTable.h"
31 #include "llvm/Support/ErrorHandling.h"
32 #include "llvm/Support/ManagedStatic.h"
33 #include "llvm/Support/Signals.h"
34 #include "llvm/Support/TargetSelect.h"
35 #include "llvm/Support/Timer.h"
36 #include "llvm/Support/raw_ostream.h"
37 #include <cstdio>
38 using namespace clang;
39 using namespace llvm::opt;
40 
41 //===----------------------------------------------------------------------===//
42 // Main driver
43 //===----------------------------------------------------------------------===//
44 
45 static void LLVMErrorHandler(void *UserData, const std::string &Message,
46                              bool GenCrashDiag) {
47   DiagnosticsEngine &Diags = *static_cast<DiagnosticsEngine*>(UserData);
48 
49   Diags.Report(diag::err_fe_error_backend) << Message;
50 
51   // Run the interrupt handlers to make sure any special cleanups get done, in
52   // particular that we remove files registered with RemoveFileOnSignal.
53   llvm::sys::RunInterruptHandlers();
54 
55   // We cannot recover from llvm errors.  When reporting a fatal error, exit
56   // with status 70 to generate crash diagnostics.  For BSD systems this is
57   // defined as an internal software error.  Otherwise, exit with status 1.
58   exit(GenCrashDiag ? 70 : 1);
59 }
60 
61 #ifdef LINK_POLLY_INTO_TOOLS
62 namespace polly {
63 void initializePollyPasses(llvm::PassRegistry &Registry);
64 }
65 #endif
66 
67 int cc1_main(ArrayRef<const char *> Argv, const char *Argv0, void *MainAddr) {
68   std::unique_ptr<CompilerInstance> Clang(new CompilerInstance(
69       std::make_shared<ObjectFilePCHContainerOperations>()));
70   IntrusiveRefCntPtr<DiagnosticIDs> DiagID(new DiagnosticIDs());
71 
72   // Initialize targets first, so that --version shows registered targets.
73   llvm::InitializeAllTargets();
74   llvm::InitializeAllTargetMCs();
75   llvm::InitializeAllAsmPrinters();
76   llvm::InitializeAllAsmParsers();
77 
78 #ifdef LINK_POLLY_INTO_TOOLS
79   llvm::PassRegistry &Registry = *llvm::PassRegistry::getPassRegistry();
80   polly::initializePollyPasses(Registry);
81 #endif
82 
83   // Buffer diagnostics from argument parsing so that we can output them using a
84   // well formed diagnostic object.
85   IntrusiveRefCntPtr<DiagnosticOptions> DiagOpts = new DiagnosticOptions();
86   TextDiagnosticBuffer *DiagsBuffer = new TextDiagnosticBuffer;
87   DiagnosticsEngine Diags(DiagID, &*DiagOpts, DiagsBuffer);
88   bool Success = CompilerInvocation::CreateFromArgs(
89       Clang->getInvocation(), Argv.begin(), Argv.end(), 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(std::move(Clang));
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