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1 //===--- ParseAST.cpp - Provide the clang::ParseAST method ----------------===//
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2 //
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3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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4 // See https://llvm.org/LICENSE.txt for license information.
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5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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6 //
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7 //===----------------------------------------------------------------------===//
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8 //
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9 // This file implements the clang::ParseAST method.
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10 //
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11 //===----------------------------------------------------------------------===//
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12
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13 #include "clang/Parse/ParseAST.h"
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14 #include "clang/AST/ASTConsumer.h"
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15 #include "clang/AST/ASTContext.h"
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16 #include "clang/AST/ExternalASTSource.h"
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17 #include "clang/AST/Stmt.h"
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18 #include "clang/Parse/ParseDiagnostic.h"
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19 #include "clang/Parse/Parser.h"
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20 #include "clang/Sema/CodeCompleteConsumer.h"
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21 #include "clang/Sema/Sema.h"
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22 #include "clang/Sema/SemaConsumer.h"
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23 #include "clang/Sema/TemplateInstCallback.h"
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24 #include "llvm/Support/CrashRecoveryContext.h"
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25 #include "llvm/Support/TimeProfiler.h"
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26 #include <cstdio>
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27 #include <memory>
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28
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29 using namespace clang;
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30
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31 namespace {
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32
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33 /// Resets LLVM's pretty stack state so that stack traces are printed correctly
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34 /// when there are nested CrashRecoveryContexts and the inner one recovers from
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35 /// a crash.
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36 class ResetStackCleanup
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37 : public llvm::CrashRecoveryContextCleanupBase<ResetStackCleanup,
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38 const void> {
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39 public:
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40 ResetStackCleanup(llvm::CrashRecoveryContext *Context, const void *Top)
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41 : llvm::CrashRecoveryContextCleanupBase<ResetStackCleanup, const void>(
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42 Context, Top) {}
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43 void recoverResources() override {
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44 llvm::RestorePrettyStackState(resource);
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45 }
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46 };
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47
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48 /// If a crash happens while the parser is active, an entry is printed for it.
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49 class PrettyStackTraceParserEntry : public llvm::PrettyStackTraceEntry {
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50 const Parser &P;
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51 public:
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52 PrettyStackTraceParserEntry(const Parser &p) : P(p) {}
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53 void print(raw_ostream &OS) const override;
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54 };
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55
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56 /// If a crash happens while the parser is active, print out a line indicating
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57 /// what the current token is.
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58 void PrettyStackTraceParserEntry::print(raw_ostream &OS) const {
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59 const Token &Tok = P.getCurToken();
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60 if (Tok.is(tok::eof)) {
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61 OS << "<eof> parser at end of file\n";
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62 return;
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63 }
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64
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65 if (Tok.getLocation().isInvalid()) {
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66 OS << "<unknown> parser at unknown location\n";
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67 return;
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68 }
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69
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70 const Preprocessor &PP = P.getPreprocessor();
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71 Tok.getLocation().print(OS, PP.getSourceManager());
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72 if (Tok.isAnnotation()) {
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73 OS << ": at annotation token\n";
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74 } else {
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75 // Do the equivalent of PP.getSpelling(Tok) except for the parts that would
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76 // allocate memory.
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77 bool Invalid = false;
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78 const SourceManager &SM = P.getPreprocessor().getSourceManager();
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79 unsigned Length = Tok.getLength();
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80 const char *Spelling = SM.getCharacterData(Tok.getLocation(), &Invalid);
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81 if (Invalid) {
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82 OS << ": unknown current parser token\n";
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83 return;
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84 }
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85 OS << ": current parser token '" << StringRef(Spelling, Length) << "'\n";
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86 }
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87 }
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88
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89 } // namespace
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90
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91 //===----------------------------------------------------------------------===//
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92 // Public interface to the file
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93 //===----------------------------------------------------------------------===//
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94
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95 /// ParseAST - Parse the entire file specified, notifying the ASTConsumer as
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96 /// the file is parsed. This inserts the parsed decls into the translation unit
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97 /// held by Ctx.
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98 ///
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99 void clang::ParseAST(Preprocessor &PP, ASTConsumer *Consumer,
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100 ASTContext &Ctx, bool PrintStats,
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101 TranslationUnitKind TUKind,
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102 CodeCompleteConsumer *CompletionConsumer,
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103 bool SkipFunctionBodies) {
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104
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105 std::unique_ptr<Sema> S(
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106 new Sema(PP, Ctx, *Consumer, TUKind, CompletionConsumer));
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107
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108 // Recover resources if we crash before exiting this method.
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109 llvm::CrashRecoveryContextCleanupRegistrar<Sema> CleanupSema(S.get());
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110
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111 ParseAST(*S.get(), PrintStats, SkipFunctionBodies);
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112 }
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113
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114 void clang::ParseAST(Sema &S, bool PrintStats, bool SkipFunctionBodies) {
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115 // Collect global stats on Decls/Stmts (until we have a module streamer).
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116 if (PrintStats) {
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117 Decl::EnableStatistics();
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118 Stmt::EnableStatistics();
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119 }
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120
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121 // Also turn on collection of stats inside of the Sema object.
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122 bool OldCollectStats = PrintStats;
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123 std::swap(OldCollectStats, S.CollectStats);
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124
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125 // Initialize the template instantiation observer chain.
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126 // FIXME: See note on "finalize" below.
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127 initialize(S.TemplateInstCallbacks, S);
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128
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129 ASTConsumer *Consumer = &S.getASTConsumer();
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130
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131 std::unique_ptr<Parser> ParseOP(
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132 new Parser(S.getPreprocessor(), S, SkipFunctionBodies));
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133 Parser &P = *ParseOP.get();
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134
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135 llvm::CrashRecoveryContextCleanupRegistrar<const void, ResetStackCleanup>
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136 CleanupPrettyStack(llvm::SavePrettyStackState());
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137 PrettyStackTraceParserEntry CrashInfo(P);
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138
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139 // Recover resources if we crash before exiting this method.
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140 llvm::CrashRecoveryContextCleanupRegistrar<Parser>
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141 CleanupParser(ParseOP.get());
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142
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143 S.getPreprocessor().EnterMainSourceFile();
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144 ExternalASTSource *External = S.getASTContext().getExternalSource();
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145 if (External)
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146 External->StartTranslationUnit(Consumer);
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147
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148 // If a PCH through header is specified that does not have an include in
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149 // the source, or a PCH is being created with #pragma hdrstop with nothing
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150 // after the pragma, there won't be any tokens or a Lexer.
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151 bool HaveLexer = S.getPreprocessor().getCurrentLexer();
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152
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153 if (HaveLexer) {
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154 llvm::TimeTraceScope TimeScope("Frontend");
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155 P.Initialize();
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156 Parser::DeclGroupPtrTy ADecl;
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236
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157 Sema::ModuleImportState ImportState;
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158 EnterExpressionEvaluationContext PotentiallyEvaluated(
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159 S, Sema::ExpressionEvaluationContext::PotentiallyEvaluated);
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160
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161 for (bool AtEOF = P.ParseFirstTopLevelDecl(ADecl, ImportState); !AtEOF;
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162 AtEOF = P.ParseTopLevelDecl(ADecl, ImportState)) {
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150
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163 // If we got a null return and something *was* parsed, ignore it. This
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164 // is due to a top-level semicolon, an action override, or a parse error
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165 // skipping something.
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166 if (ADecl && !Consumer->HandleTopLevelDecl(ADecl.get()))
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167 return;
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168 }
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169 }
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170
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171 // Process any TopLevelDecls generated by #pragma weak.
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172 for (Decl *D : S.WeakTopLevelDecls())
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173 Consumer->HandleTopLevelDecl(DeclGroupRef(D));
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174
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236
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175 // For C++20 modules, the codegen for module initializers needs to be altered
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176 // and to be able to use a name based on the module name.
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177
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178 // At this point, we should know if we are building a non-header C++20 module.
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179 if (S.getLangOpts().CPlusPlusModules) {
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180 // If we are building the module from source, then the top level module
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181 // will be here.
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182 Module *CodegenModule = S.getCurrentModule();
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183 bool Interface = true;
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184 if (CodegenModule)
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185 // We only use module initializers for importable module (including
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186 // partition implementation units).
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187 Interface = S.currentModuleIsInterface();
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188 else if (S.getLangOpts().isCompilingModuleInterface())
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189 // If we are building the module from a PCM file, then the module can be
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190 // found here.
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191 CodegenModule = S.getPreprocessor().getCurrentModule();
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192
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193 if (Interface && CodegenModule)
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194 S.getASTContext().setModuleForCodeGen(CodegenModule);
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195 }
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150
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196 Consumer->HandleTranslationUnit(S.getASTContext());
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197
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198 // Finalize the template instantiation observer chain.
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199 // FIXME: This (and init.) should be done in the Sema class, but because
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200 // Sema does not have a reliable "Finalize" function (it has a
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201 // destructor, but it is not guaranteed to be called ("-disable-free")).
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202 // So, do the initialization above and do the finalization here:
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203 finalize(S.TemplateInstCallbacks, S);
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204
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205 std::swap(OldCollectStats, S.CollectStats);
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206 if (PrintStats) {
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207 llvm::errs() << "\nSTATISTICS:\n";
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208 if (HaveLexer) P.getActions().PrintStats();
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209 S.getASTContext().PrintStats();
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210 Decl::PrintStats();
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211 Stmt::PrintStats();
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212 Consumer->PrintStats();
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213 }
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214 }
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