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//===--- ASTStreamer.cpp - Provide streaming interface to ASTs ------------===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by Chris Lattner and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the ASTStreamer interface.
//
//===----------------------------------------------------------------------===//
#include "clang/Sema/ASTStreamer.h"
#include "clang/AST/ASTContext.h"
#include "Sema.h"
#include "clang/Parse/Action.h"
#include "clang/Parse/Parser.h"
using namespace clang;
namespace {
class ASTStreamer {
Parser P;
std::vector<Decl*> LastInGroupList;
public:
ASTStreamer(Preprocessor &pp, ASTContext &ctxt, unsigned MainFileID)
: P(pp, *new Sema(pp, ctxt, LastInGroupList)) {
pp.EnterSourceFile(MainFileID, 0, true);
// Initialize the parser.
P.Initialize();
}
/// ReadTopLevelDecl - Parse and return the next top-level declaration.
Decl *ReadTopLevelDecl();
void PrintStats() const;
~ASTStreamer() {
P.Finalize();
delete &P.getActions();
}
};
}
/// ReadTopLevelDecl - Parse and return the next top-level declaration.
///
Decl *ASTStreamer::ReadTopLevelDecl() {
Parser::DeclTy *Result;
/// If the previous time through we read something like 'int X, Y', return
/// the next declarator.
if (!LastInGroupList.empty()) {
Result = LastInGroupList.back();
LastInGroupList.pop_back();
return static_cast<Decl*>(Result);
}
do {
if (P.ParseTopLevelDecl(Result))
return 0; // End of file.
// If we got a null return and something *was* parsed, try again. This
// is due to a top-level semicolon, an action override, or a parse error
// skipping something.
} while (Result == 0);
// If we parsed a declspec with multiple declarators, reverse the list and
// return the first one.
if (!LastInGroupList.empty()) {
LastInGroupList.push_back((Decl*)Result);
std::reverse(LastInGroupList.begin(), LastInGroupList.end());
Result = LastInGroupList.back();
LastInGroupList.pop_back();
}
return static_cast<Decl*>(Result);
}
void ASTStreamer::PrintStats() const {
}
//===----------------------------------------------------------------------===//
// Public interface to the file
//===----------------------------------------------------------------------===//
/// ASTStreamer_Init - Create an ASTStreamer with the specified preprocessor
/// and FileID.
ASTStreamerTy *clang::ASTStreamer_Init(Preprocessor &pp, ASTContext &ctxt,
unsigned MainFileID) {
return new ASTStreamer(pp, ctxt, MainFileID);
}
/// ASTStreamer_ReadTopLevelDecl - Parse and return one top-level declaration. This
/// returns null at end of file.
Decl *clang::ASTStreamer_ReadTopLevelDecl(ASTStreamerTy *Streamer) {
return static_cast<ASTStreamer*>(Streamer)->ReadTopLevelDecl();
}
/// ASTStreamer_PrintStats - Emit statistic information to stderr.
///
void clang::ASTStreamer_PrintStats(ASTStreamerTy *Streamer) {
return static_cast<ASTStreamer*>(Streamer)->PrintStats();
}
/// ASTStreamer_Terminate - Gracefully shut down the streamer.
///
void clang::ASTStreamer_Terminate(ASTStreamerTy *Streamer) {
delete static_cast<ASTStreamer*>(Streamer);
}
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