cc1_main.cpp revision 4b93d660c6326ec79b5e369317d1051cf826c2f3 
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/CC1Options.h"
19#include "clang/Driver/DriverDiagnostic.h"
20#include "clang/Driver/OptTable.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/Support/ErrorHandling.h"
29#include "llvm/Support/ManagedStatic.h"
30#include "llvm/Support/Timer.h"
31#include "llvm/Support/raw_ostream.h"
32#include "llvm/Target/TargetSelect.h"
33#include <cstdio>
34using namespace clang;
35
36//===----------------------------------------------------------------------===//
37// Main driver
38//===----------------------------------------------------------------------===//
39
40static void LLVMErrorHandler(void *UserData, const std::string &Message) {
41  Diagnostic &Diags = *static_cast<Diagnostic*>(UserData);
42
43  Diags.Report(diag::err_fe_error_backend) << Message;
44
45  // We cannot recover from llvm errors.
46  exit(1);
47}
48
49// FIXME: Define the need for this testing away.
50static int cc1_test(Diagnostic &Diags,
51                    const char **ArgBegin, const char **ArgEnd) {
52  using namespace clang::driver;
53
54  llvm::errs() << "cc1 argv:";
55  for (const char **i = ArgBegin; i != ArgEnd; ++i)
56    llvm::errs() << " \"" << *i << '"';
57  llvm::errs() << "\n";
58
59  // Parse the arguments.
60  OptTable *Opts = createCC1OptTable();
61  unsigned MissingArgIndex, MissingArgCount;
62  InputArgList *Args = Opts->ParseArgs(ArgBegin, ArgEnd,
63                                       MissingArgIndex, MissingArgCount);
64
65  // Check for missing argument error.
66  if (MissingArgCount)
67    Diags.Report(clang::diag::err_drv_missing_argument)
68      << Args->getArgString(MissingArgIndex) << MissingArgCount;
69
70  // Dump the parsed arguments.
71  llvm::errs() << "cc1 parsed options:\n";
72  for (ArgList::const_iterator it = Args->begin(), ie = Args->end();
73       it != ie; ++it)
74    (*it)->dump();
75
76  // Create a compiler invocation.
77  llvm::errs() << "cc1 creating invocation.\n";
78  CompilerInvocation Invocation;
79  CompilerInvocation::CreateFromArgs(Invocation, ArgBegin, ArgEnd, Diags);
80
81  // Convert the invocation back to argument strings.
82  std::vector<std::string> InvocationArgs;
83  Invocation.toArgs(InvocationArgs);
84
85  // Dump the converted arguments.
86  llvm::SmallVector<const char*, 32> Invocation2Args;
87  llvm::errs() << "invocation argv :";
88  for (unsigned i = 0, e = InvocationArgs.size(); i != e; ++i) {
89    Invocation2Args.push_back(InvocationArgs[i].c_str());
90    llvm::errs() << " \"" << InvocationArgs[i] << '"';
91  }
92  llvm::errs() << "\n";
93
94  // Convert those arguments to another invocation, and check that we got the
95  // same thing.
96  CompilerInvocation Invocation2;
97  CompilerInvocation::CreateFromArgs(Invocation2, Invocation2Args.begin(),
98                                     Invocation2Args.end(), Diags);
99
100  // FIXME: Implement CompilerInvocation comparison.
101  if (true) {
102    //llvm::errs() << "warning: Invocations differ!\n";
103
104    std::vector<std::string> Invocation2Args;
105    Invocation2.toArgs(Invocation2Args);
106    llvm::errs() << "invocation2 argv:";
107    for (unsigned i = 0, e = Invocation2Args.size(); i != e; ++i)
108      llvm::errs() << " \"" << Invocation2Args[i] << '"';
109    llvm::errs() << "\n";
110  }
111
112  return 0;
113}
114
115int cc1_main(const char **ArgBegin, const char **ArgEnd,
116             const char *Argv0, void *MainAddr) {
117  llvm::OwningPtr<CompilerInstance> Clang(new CompilerInstance());
118  llvm::IntrusiveRefCntPtr<DiagnosticIDs> DiagID(new DiagnosticIDs());
119
120  // Run clang -cc1 test.
121  if (ArgBegin != ArgEnd && llvm::StringRef(ArgBegin[0]) == "-cc1test") {
122    Diagnostic Diags(DiagID, new TextDiagnosticPrinter(llvm::errs(),
123                                                       DiagnosticOptions()));
124    return cc1_test(Diags, ArgBegin + 1, ArgEnd);
125  }
126
127  // Initialize targets first, so that --version shows registered targets.
128  llvm::InitializeAllTargets();
129  llvm::InitializeAllAsmPrinters();
130  llvm::InitializeAllAsmParsers();
131
132  // Buffer diagnostics from argument parsing so that we can output them using a
133  // well formed diagnostic object.
134  TextDiagnosticBuffer *DiagsBuffer = new TextDiagnosticBuffer;
135  Diagnostic Diags(DiagID, DiagsBuffer);
136  CompilerInvocation::CreateFromArgs(Clang->getInvocation(), ArgBegin, ArgEnd,
137                                     Diags);
138
139  // Infer the builtin include path if unspecified.
140  if (Clang->getHeaderSearchOpts().UseBuiltinIncludes &&
141      Clang->getHeaderSearchOpts().ResourceDir.empty())
142    Clang->getHeaderSearchOpts().ResourceDir =
143      CompilerInvocation::GetResourcesPath(Argv0, MainAddr);
144
145  // Create the actual diagnostics engine.
146  Clang->createDiagnostics(ArgEnd - ArgBegin, const_cast<char**>(ArgBegin));
147  if (!Clang->hasDiagnostics())
148    return 1;
149
150  // Set an error handler, so that any LLVM backend diagnostics go through our
151  // error handler.
152  llvm::install_fatal_error_handler(LLVMErrorHandler,
153                                  static_cast<void*>(&Clang->getDiagnostics()));
154
155  DiagsBuffer->FlushDiagnostics(Clang->getDiagnostics());
156
157  // Execute the frontend actions.
158  bool Success = ExecuteCompilerInvocation(Clang.get());
159
160  // If any timers were active but haven't been destroyed yet, print their
161  // results now.  This happens in -disable-free mode.
162  llvm::TimerGroup::printAll(llvm::errs());
163
164  // Our error handler depends on the Diagnostics object, which we're
165  // potentially about to delete. Uninstall the handler now so that any
166  // later errors use the default handling behavior instead.
167  llvm::remove_fatal_error_handler();
168
169  // When running with -disable-free, don't do any destruction or shutdown.
170  if (Clang->getFrontendOpts().DisableFree) {
171    if (Clang->getFrontendOpts().ShowStats)
172      llvm::PrintStatistics();
173    Clang.take();
174    return !Success;
175  }
176
177  // Managed static deconstruction. Useful for making things like
178  // -time-passes usable.
179  llvm::llvm_shutdown();
180
181  return !Success;
182}
183