1 //===--- ParseAST.cpp - Provide the clang::ParseAST method ----------------===//
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 file implements the clang::ParseAST method.
11 //
12 //===----------------------------------------------------------------------===//
13
14 #include "clang/Parse/ParseAST.h"
15 #include "clang/Sema/Sema.h"
16 #include "clang/Sema/CodeCompleteConsumer.h"
17 #include "clang/Sema/SemaConsumer.h"
18 #include "clang/Sema/ExternalSemaSource.h"
19 #include "clang/AST/ASTConsumer.h"
20 #include "clang/AST/DeclCXX.h"
21 #include "clang/AST/ExternalASTSource.h"
22 #include "clang/AST/Stmt.h"
23 #include "clang/Parse/Parser.h"
24 #include "llvm/ADT/OwningPtr.h"
25 #include "llvm/Support/CrashRecoveryContext.h"
26 #include <cstdio>
27
28 using namespace clang;
29
30 //===----------------------------------------------------------------------===//
31 // Public interface to the file
32 //===----------------------------------------------------------------------===//
33
34 /// ParseAST - Parse the entire file specified, notifying the ASTConsumer as
35 /// the file is parsed. This inserts the parsed decls into the translation unit
36 /// held by Ctx.
37 ///
ParseAST(Preprocessor & PP,ASTConsumer * Consumer,ASTContext & Ctx,bool PrintStats,bool CompleteTranslationUnit,CodeCompleteConsumer * CompletionConsumer)38 void clang::ParseAST(Preprocessor &PP, ASTConsumer *Consumer,
39 ASTContext &Ctx, bool PrintStats,
40 bool CompleteTranslationUnit,
41 CodeCompleteConsumer *CompletionConsumer) {
42
43 llvm::OwningPtr<Sema> S(new Sema(PP, Ctx, *Consumer,
44 CompleteTranslationUnit,
45 CompletionConsumer));
46
47 // Recover resources if we crash before exiting this method.
48 llvm::CrashRecoveryContextCleanupRegistrar<Sema> CleaupSema(S.get());
49
50 ParseAST(*S.get(), PrintStats);
51 }
52
ParseAST(Sema & S,bool PrintStats)53 void clang::ParseAST(Sema &S, bool PrintStats) {
54 // Collect global stats on Decls/Stmts (until we have a module streamer).
55 if (PrintStats) {
56 Decl::CollectingStats(true);
57 Stmt::CollectingStats(true);
58 }
59
60 // Also turn on collection of stats inside of the Sema object.
61 bool OldCollectStats = PrintStats;
62 std::swap(OldCollectStats, S.CollectStats);
63
64 ASTConsumer *Consumer = &S.getASTConsumer();
65
66 llvm::OwningPtr<Parser> ParseOP(new Parser(S.getPreprocessor(), S));
67 Parser &P = *ParseOP.get();
68
69 PrettyStackTraceParserEntry CrashInfo(P);
70
71 // Recover resources if we crash before exiting this method.
72 llvm::CrashRecoveryContextCleanupRegistrar<Parser>
73 CleaupParser(ParseOP.get());
74
75 S.getPreprocessor().EnterMainSourceFile();
76 P.Initialize();
77 S.Initialize();
78
79 if (ExternalASTSource *External = S.getASTContext().getExternalSource())
80 External->StartTranslationUnit(Consumer);
81
82 Parser::DeclGroupPtrTy ADecl;
83
84 while (!P.ParseTopLevelDecl(ADecl)) { // Not end of file.
85 // If we got a null return and something *was* parsed, ignore it. This
86 // is due to a top-level semicolon, an action override, or a parse error
87 // skipping something.
88 if (ADecl)
89 Consumer->HandleTopLevelDecl(ADecl.get());
90 };
91 // Check for any pending objective-c implementation decl.
92 while ((ADecl = P.FinishPendingObjCActions()))
93 Consumer->HandleTopLevelDecl(ADecl.get());
94
95 // Process any TopLevelDecls generated by #pragma weak.
96 for (llvm::SmallVector<Decl*,2>::iterator
97 I = S.WeakTopLevelDecls().begin(),
98 E = S.WeakTopLevelDecls().end(); I != E; ++I)
99 Consumer->HandleTopLevelDecl(DeclGroupRef(*I));
100
101 Consumer->HandleTranslationUnit(S.getASTContext());
102
103 std::swap(OldCollectStats, S.CollectStats);
104 if (PrintStats) {
105 llvm::errs() << "\nSTATISTICS:\n";
106 P.getActions().PrintStats();
107 S.getASTContext().PrintStats();
108 Decl::PrintStats();
109 Stmt::PrintStats();
110 Consumer->PrintStats();
111 }
112 }
113