cc1_main.cpp revision 1e4c01b79273b9cd4e9e9ecfd3422df3900b8356 
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/TargetSelect.h"
31#include "llvm/Support/Timer.h"
32#include "llvm/Support/raw_ostream.h"
33#include "llvm/LinkAllPasses.h"
34#include <cstdio>
35using namespace clang;
36
37//===----------------------------------------------------------------------===//
38// Main driver
39//===----------------------------------------------------------------------===//
40
41static void LLVMErrorHandler(void *UserData, const std::string &Message) {
42  DiagnosticsEngine &Diags = *static_cast<DiagnosticsEngine*>(UserData);
43
44  Diags.Report(diag::err_fe_error_backend) << Message;
45
46  // We cannot recover from llvm errors.
47  exit(1);
48}
49
50// FIXME: Define the need for this testing away.
51static int cc1_test(DiagnosticsEngine &Diags,
52                    const char **ArgBegin, const char **ArgEnd) {
53  using namespace clang::driver;
54
55  llvm::errs() << "cc1 argv:";
56  for (const char **i = ArgBegin; i != ArgEnd; ++i)
57    llvm::errs() << " \"" << *i << '"';
58  llvm::errs() << "\n";
59
60  // Parse the arguments.
61  OptTable *Opts = createCC1OptTable();
62  unsigned MissingArgIndex, MissingArgCount;
63  InputArgList *Args = Opts->ParseArgs(ArgBegin, ArgEnd,
64                                       MissingArgIndex, MissingArgCount);
65
66  // Check for missing argument error.
67  if (MissingArgCount)
68    Diags.Report(clang::diag::err_drv_missing_argument)
69      << Args->getArgString(MissingArgIndex) << MissingArgCount;
70
71  // Dump the parsed arguments.
72  llvm::errs() << "cc1 parsed options:\n";
73  for (ArgList::const_iterator it = Args->begin(), ie = Args->end();
74       it != ie; ++it)
75    (*it)->dump();
76
77  // Create a compiler invocation.
78  llvm::errs() << "cc1 creating invocation.\n";
79  CompilerInvocation Invocation;
80  if (!CompilerInvocation::CreateFromArgs(Invocation, ArgBegin, ArgEnd, Diags))
81    return 1;
82
83  // Convert the invocation back to argument strings.
84  std::vector<std::string> InvocationArgs;
85  Invocation.toArgs(InvocationArgs);
86
87  // Dump the converted arguments.
88  SmallVector<const char*, 32> Invocation2Args;
89  llvm::errs() << "invocation argv :";
90  for (unsigned i = 0, e = InvocationArgs.size(); i != e; ++i) {
91    Invocation2Args.push_back(InvocationArgs[i].c_str());
92    llvm::errs() << " \"" << InvocationArgs[i] << '"';
93  }
94  llvm::errs() << "\n";
95
96  // Convert those arguments to another invocation, and check that we got the
97  // same thing.
98  CompilerInvocation Invocation2;
99  if (!CompilerInvocation::CreateFromArgs(Invocation2, Invocation2Args.begin(),
100                                          Invocation2Args.end(), Diags))
101    return 1;
102
103  // FIXME: Implement CompilerInvocation comparison.
104  if (true) {
105    //llvm::errs() << "warning: Invocations differ!\n";
106
107    std::vector<std::string> Invocation2Args;
108    Invocation2.toArgs(Invocation2Args);
109    llvm::errs() << "invocation2 argv:";
110    for (unsigned i = 0, e = Invocation2Args.size(); i != e; ++i)
111      llvm::errs() << " \"" << Invocation2Args[i] << '"';
112    llvm::errs() << "\n";
113  }
114
115  return 0;
116}
117
118int cc1_main(const char **ArgBegin, const char **ArgEnd,
119             const char *Argv0, void *MainAddr) {
120  OwningPtr<CompilerInstance> Clang(new CompilerInstance());
121  llvm::IntrusiveRefCntPtr<DiagnosticIDs> DiagID(new DiagnosticIDs());
122
123  // Run clang -cc1 test.
124  if (ArgBegin != ArgEnd && StringRef(ArgBegin[0]) == "-cc1test") {
125    DiagnosticsEngine Diags(DiagID, new TextDiagnosticPrinter(llvm::errs(),
126                                                       DiagnosticOptions()));
127    return cc1_test(Diags, ArgBegin + 1, ArgEnd);
128  }
129
130  // Initialize targets first, so that --version shows registered targets.
131  llvm::InitializeAllTargets();
132  llvm::InitializeAllTargetMCs();
133  llvm::InitializeAllAsmPrinters();
134  llvm::InitializeAllAsmParsers();
135
136  // Buffer diagnostics from argument parsing so that we can output them using a
137  // well formed diagnostic object.
138  TextDiagnosticBuffer *DiagsBuffer = new TextDiagnosticBuffer;
139  DiagnosticsEngine Diags(DiagID, DiagsBuffer);
140  bool Success;
141  Success = CompilerInvocation::CreateFromArgs(Clang->getInvocation(),
142                                               ArgBegin, ArgEnd, Diags);
143
144  // Infer the builtin include path if unspecified.
145  if (Clang->getHeaderSearchOpts().UseBuiltinIncludes &&
146      Clang->getHeaderSearchOpts().ResourceDir.empty())
147    Clang->getHeaderSearchOpts().ResourceDir =
148      CompilerInvocation::GetResourcesPath(Argv0, MainAddr);
149
150  // Create the actual diagnostics engine.
151  Clang->createDiagnostics(ArgEnd - ArgBegin, const_cast<char**>(ArgBegin));
152  if (!Clang->hasDiagnostics())
153    return 1;
154
155  // Set an error handler, so that any LLVM backend diagnostics go through our
156  // error handler.
157  llvm::install_fatal_error_handler(LLVMErrorHandler,
158                                  static_cast<void*>(&Clang->getDiagnostics()));
159
160  DiagsBuffer->FlushDiagnostics(Clang->getDiagnostics());
161  if (!Success)
162    return 1;
163
164  // Execute the frontend actions.
165  Success = ExecuteCompilerInvocation(Clang.get());
166
167  // If any timers were active but haven't been destroyed yet, print their
168  // results now.  This happens in -disable-free mode.
169  llvm::TimerGroup::printAll(llvm::errs());
170
171  // Our error handler depends on the Diagnostics object, which we're
172  // potentially about to delete. Uninstall the handler now so that any
173  // later errors use the default handling behavior instead.
174  llvm::remove_fatal_error_handler();
175
176  // When running with -disable-free, don't do any destruction or shutdown.
177  if (Clang->getFrontendOpts().DisableFree) {
178    if (llvm::AreStatisticsEnabled() || Clang->getFrontendOpts().ShowStats)
179      llvm::PrintStatistics();
180    Clang.take();
181    return !Success;
182  }
183
184  // Managed static deconstruction. Useful for making things like
185  // -time-passes usable.
186  llvm::llvm_shutdown();
187
188  return !Success;
189}
190