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comparison clang/lib/Parse/ParseAST.cpp @ 150:1d019706d866

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LLVM10
author anatofuz
date Thu, 13 Feb 2020 15:10:13 +0900
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children c4bab56944e8
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147:c2174574ed3a 150:1d019706d866
1 //===--- ParseAST.cpp - Provide the clang::ParseAST method ----------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This file implements the clang::ParseAST method.
10 //
11 //===----------------------------------------------------------------------===//
12
13 #include "clang/Parse/ParseAST.h"
14 #include "clang/AST/ASTConsumer.h"
15 #include "clang/AST/ASTContext.h"
16 #include "clang/AST/ExternalASTSource.h"
17 #include "clang/AST/Stmt.h"
18 #include "clang/Parse/ParseDiagnostic.h"
19 #include "clang/Parse/Parser.h"
20 #include "clang/Sema/CodeCompleteConsumer.h"
21 #include "clang/Sema/Sema.h"
22 #include "clang/Sema/SemaConsumer.h"
23 #include "clang/Sema/TemplateInstCallback.h"
24 #include "llvm/Support/CrashRecoveryContext.h"
25 #include "llvm/Support/TimeProfiler.h"
26 #include <cstdio>
27 #include <memory>
28
29 using namespace clang;
30
31 namespace {
32
33 /// Resets LLVM's pretty stack state so that stack traces are printed correctly
34 /// when there are nested CrashRecoveryContexts and the inner one recovers from
35 /// a crash.
36 class ResetStackCleanup
37 : public llvm::CrashRecoveryContextCleanupBase<ResetStackCleanup,
38 const void> {
39 public:
40 ResetStackCleanup(llvm::CrashRecoveryContext *Context, const void *Top)
41 : llvm::CrashRecoveryContextCleanupBase<ResetStackCleanup, const void>(
42 Context, Top) {}
43 void recoverResources() override {
44 llvm::RestorePrettyStackState(resource);
45 }
46 };
47
48 /// If a crash happens while the parser is active, an entry is printed for it.
49 class PrettyStackTraceParserEntry : public llvm::PrettyStackTraceEntry {
50 const Parser &P;
51 public:
52 PrettyStackTraceParserEntry(const Parser &p) : P(p) {}
53 void print(raw_ostream &OS) const override;
54 };
55
56 /// If a crash happens while the parser is active, print out a line indicating
57 /// what the current token is.
58 void PrettyStackTraceParserEntry::print(raw_ostream &OS) const {
59 const Token &Tok = P.getCurToken();
60 if (Tok.is(tok::eof)) {
61 OS << "<eof> parser at end of file\n";
62 return;
63 }
64
65 if (Tok.getLocation().isInvalid()) {
66 OS << "<unknown> parser at unknown location\n";
67 return;
68 }
69
70 const Preprocessor &PP = P.getPreprocessor();
71 Tok.getLocation().print(OS, PP.getSourceManager());
72 if (Tok.isAnnotation()) {
73 OS << ": at annotation token\n";
74 } else {
75 // Do the equivalent of PP.getSpelling(Tok) except for the parts that would
76 // allocate memory.
77 bool Invalid = false;
78 const SourceManager &SM = P.getPreprocessor().getSourceManager();
79 unsigned Length = Tok.getLength();
80 const char *Spelling = SM.getCharacterData(Tok.getLocation(), &Invalid);
81 if (Invalid) {
82 OS << ": unknown current parser token\n";
83 return;
84 }
85 OS << ": current parser token '" << StringRef(Spelling, Length) << "'\n";
86 }
87 }
88
89 } // namespace
90
91 //===----------------------------------------------------------------------===//
92 // Public interface to the file
93 //===----------------------------------------------------------------------===//
94
95 /// ParseAST - Parse the entire file specified, notifying the ASTConsumer as
96 /// the file is parsed. This inserts the parsed decls into the translation unit
97 /// held by Ctx.
98 ///
99 void clang::ParseAST(Preprocessor &PP, ASTConsumer *Consumer,
100 ASTContext &Ctx, bool PrintStats,
101 TranslationUnitKind TUKind,
102 CodeCompleteConsumer *CompletionConsumer,
103 bool SkipFunctionBodies) {
104
105 std::unique_ptr<Sema> S(
106 new Sema(PP, Ctx, *Consumer, TUKind, CompletionConsumer));
107
108 // Recover resources if we crash before exiting this method.
109 llvm::CrashRecoveryContextCleanupRegistrar<Sema> CleanupSema(S.get());
110
111 ParseAST(*S.get(), PrintStats, SkipFunctionBodies);
112 }
113
114 void clang::ParseAST(Sema &S, bool PrintStats, bool SkipFunctionBodies) {
115 // Collect global stats on Decls/Stmts (until we have a module streamer).
116 if (PrintStats) {
117 Decl::EnableStatistics();
118 Stmt::EnableStatistics();
119 }
120
121 // Also turn on collection of stats inside of the Sema object.
122 bool OldCollectStats = PrintStats;
123 std::swap(OldCollectStats, S.CollectStats);
124
125 // Initialize the template instantiation observer chain.
126 // FIXME: See note on "finalize" below.
127 initialize(S.TemplateInstCallbacks, S);
128
129 ASTConsumer *Consumer = &S.getASTConsumer();
130
131 std::unique_ptr<Parser> ParseOP(
132 new Parser(S.getPreprocessor(), S, SkipFunctionBodies));
133 Parser &P = *ParseOP.get();
134
135 llvm::CrashRecoveryContextCleanupRegistrar<const void, ResetStackCleanup>
136 CleanupPrettyStack(llvm::SavePrettyStackState());
137 PrettyStackTraceParserEntry CrashInfo(P);
138
139 // Recover resources if we crash before exiting this method.
140 llvm::CrashRecoveryContextCleanupRegistrar<Parser>
141 CleanupParser(ParseOP.get());
142
143 S.getPreprocessor().EnterMainSourceFile();
144 ExternalASTSource *External = S.getASTContext().getExternalSource();
145 if (External)
146 External->StartTranslationUnit(Consumer);
147
148 // If a PCH through header is specified that does not have an include in
149 // the source, or a PCH is being created with #pragma hdrstop with nothing
150 // after the pragma, there won't be any tokens or a Lexer.
151 bool HaveLexer = S.getPreprocessor().getCurrentLexer();
152
153 if (HaveLexer) {
154 llvm::TimeTraceScope TimeScope("Frontend");
155 P.Initialize();
156 Parser::DeclGroupPtrTy ADecl;
157 for (bool AtEOF = P.ParseFirstTopLevelDecl(ADecl); !AtEOF;
158 AtEOF = P.ParseTopLevelDecl(ADecl)) {
159 // If we got a null return and something *was* parsed, ignore it. This
160 // is due to a top-level semicolon, an action override, or a parse error
161 // skipping something.
162 if (ADecl && !Consumer->HandleTopLevelDecl(ADecl.get()))
163 return;
164 }
165 }
166
167 // Process any TopLevelDecls generated by #pragma weak.
168 for (Decl *D : S.WeakTopLevelDecls())
169 Consumer->HandleTopLevelDecl(DeclGroupRef(D));
170
171 Consumer->HandleTranslationUnit(S.getASTContext());
172
173 // Finalize the template instantiation observer chain.
174 // FIXME: This (and init.) should be done in the Sema class, but because
175 // Sema does not have a reliable "Finalize" function (it has a
176 // destructor, but it is not guaranteed to be called ("-disable-free")).
177 // So, do the initialization above and do the finalization here:
178 finalize(S.TemplateInstCallbacks, S);
179
180 std::swap(OldCollectStats, S.CollectStats);
181 if (PrintStats) {
182 llvm::errs() << "\nSTATISTICS:\n";
183 if (HaveLexer) P.getActions().PrintStats();
184 S.getASTContext().PrintStats();
185 Decl::PrintStats();
186 Stmt::PrintStats();
187 Consumer->PrintStats();
188 }
189 }