зеркало из https://github.com/microsoft/clang-1.git
107 строки
3.1 KiB
C++
107 строки
3.1 KiB
C++
//===--- ParsePragma.cpp - Language specific pragma parsing ---------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the language specific #pragma handlers.
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//
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//===----------------------------------------------------------------------===//
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#include "ParsePragma.h"
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#include "clang/Basic/Diagnostic.h"
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#include "clang/Lex/Preprocessor.h"
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#include "clang/Parse/Action.h"
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using namespace clang;
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// #pragma pack(...) comes in the following delicious flavors:
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// pack '(' [integer] ')'
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// pack '(' 'show' ')'
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// pack '(' ('push' | 'pop') [',' identifier] [, integer] ')'
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void PragmaPackHandler::HandlePragma(Preprocessor &PP, Token &PackTok) {
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// FIXME: Should we be expanding macros here? My guess is no.
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SourceLocation PackLoc = PackTok.getLocation();
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Token Tok;
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PP.Lex(Tok);
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if (Tok.isNot(tok::l_paren)) {
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PP.Diag(Tok.getLocation(), diag::warn_pragma_pack_expected_lparen);
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return;
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}
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Action::PragmaPackKind Kind = Action::PPK_Default;
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IdentifierInfo *Name = 0;
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Action::OwningExprResult Alignment(Actions);
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SourceLocation LParenLoc = Tok.getLocation();
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PP.Lex(Tok);
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if (Tok.is(tok::numeric_constant)) {
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Alignment = Actions.ActOnNumericConstant(Tok);
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if (Alignment.isInvalid())
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return;
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PP.Lex(Tok);
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} else if (Tok.is(tok::identifier)) {
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const IdentifierInfo *II = Tok.getIdentifierInfo();
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if (II->isStr("show")) {
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Kind = Action::PPK_Show;
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PP.Lex(Tok);
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} else {
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if (II->isStr("push")) {
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Kind = Action::PPK_Push;
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} else if (II->isStr("pop")) {
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Kind = Action::PPK_Pop;
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} else {
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PP.Diag(Tok.getLocation(), diag::warn_pragma_pack_invalid_action);
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return;
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}
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PP.Lex(Tok);
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if (Tok.is(tok::comma)) {
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PP.Lex(Tok);
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if (Tok.is(tok::numeric_constant)) {
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Alignment = Actions.ActOnNumericConstant(Tok);
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if (Alignment.isInvalid())
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return;
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PP.Lex(Tok);
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} else if (Tok.is(tok::identifier)) {
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Name = Tok.getIdentifierInfo();
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PP.Lex(Tok);
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if (Tok.is(tok::comma)) {
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PP.Lex(Tok);
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if (Tok.isNot(tok::numeric_constant)) {
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PP.Diag(Tok.getLocation(), diag::warn_pragma_pack_malformed);
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return;
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}
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Alignment = Actions.ActOnNumericConstant(Tok);
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if (Alignment.isInvalid())
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return;
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PP.Lex(Tok);
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}
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} else {
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PP.Diag(Tok.getLocation(), diag::warn_pragma_pack_malformed);
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return;
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}
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}
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}
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}
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if (Tok.isNot(tok::r_paren)) {
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PP.Diag(Tok.getLocation(), diag::warn_pragma_pack_expected_rparen);
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return;
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}
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SourceLocation RParenLoc = Tok.getLocation();
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Actions.ActOnPragmaPack(Kind, Name, Alignment.release(), PackLoc,
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LParenLoc, RParenLoc);
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}
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