forked from OSchip/llvm-project
1660 lines
56 KiB
C++
1660 lines
56 KiB
C++
//===--- ParseStmt.cpp - Statement and Block Parser -----------------------===//
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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 Statement and Block portions of the Parser
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// interface.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/Parse/Parser.h"
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#include "RAIIObjectsForParser.h"
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#include "clang/Sema/DeclSpec.h"
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#include "clang/Sema/PrettyDeclStackTrace.h"
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#include "clang/Sema/Scope.h"
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#include "clang/Basic/Diagnostic.h"
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#include "clang/Basic/PrettyStackTrace.h"
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#include "clang/Basic/SourceManager.h"
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using namespace clang;
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//===----------------------------------------------------------------------===//
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// C99 6.8: Statements and Blocks.
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//===----------------------------------------------------------------------===//
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/// ParseStatementOrDeclaration - Read 'statement' or 'declaration'.
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/// StatementOrDeclaration:
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/// statement
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/// declaration
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///
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/// statement:
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/// labeled-statement
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/// compound-statement
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/// expression-statement
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/// selection-statement
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/// iteration-statement
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/// jump-statement
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/// [C++] declaration-statement
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/// [C++] try-block
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/// [OBC] objc-throw-statement
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/// [OBC] objc-try-catch-statement
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/// [OBC] objc-synchronized-statement
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/// [GNU] asm-statement
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/// [OMP] openmp-construct [TODO]
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///
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/// labeled-statement:
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/// identifier ':' statement
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/// 'case' constant-expression ':' statement
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/// 'default' ':' statement
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///
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/// selection-statement:
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/// if-statement
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/// switch-statement
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///
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/// iteration-statement:
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/// while-statement
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/// do-statement
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/// for-statement
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///
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/// expression-statement:
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/// expression[opt] ';'
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///
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/// jump-statement:
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/// 'goto' identifier ';'
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/// 'continue' ';'
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/// 'break' ';'
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/// 'return' expression[opt] ';'
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/// [GNU] 'goto' '*' expression ';'
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///
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/// [OBC] objc-throw-statement:
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/// [OBC] '@' 'throw' expression ';'
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/// [OBC] '@' 'throw' ';'
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///
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StmtResult
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Parser::ParseStatementOrDeclaration(StmtVector &Stmts, bool OnlyStatement) {
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const char *SemiError = 0;
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StmtResult Res;
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ParenBraceBracketBalancer BalancerRAIIObj(*this);
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ParsedAttributesWithRange attrs;
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MaybeParseCXX0XAttributes(attrs);
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// Cases in this switch statement should fall through if the parser expects
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// the token to end in a semicolon (in which case SemiError should be set),
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// or they directly 'return;' if not.
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tok::TokenKind Kind = Tok.getKind();
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SourceLocation AtLoc;
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switch (Kind) {
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case tok::at: // May be a @try or @throw statement
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{
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AtLoc = ConsumeToken(); // consume @
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return ParseObjCAtStatement(AtLoc);
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}
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case tok::code_completion:
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Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_Statement);
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ConsumeCodeCompletionToken();
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return ParseStatementOrDeclaration(Stmts, OnlyStatement);
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case tok::identifier:
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if (NextToken().is(tok::colon)) { // C99 6.8.1: labeled-statement
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// identifier ':' statement
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return ParseLabeledStatement(attrs);
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}
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// PASS THROUGH.
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default: {
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if ((getLang().CPlusPlus || !OnlyStatement) && isDeclarationStatement()) {
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SourceLocation DeclStart = Tok.getLocation(), DeclEnd;
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DeclGroupPtrTy Decl = ParseDeclaration(Stmts, Declarator::BlockContext,
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DeclEnd, attrs);
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return Actions.ActOnDeclStmt(Decl, DeclStart, DeclEnd);
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}
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if (Tok.is(tok::r_brace)) {
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Diag(Tok, diag::err_expected_statement);
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return StmtError();
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}
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// FIXME: Use the attributes
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// expression[opt] ';'
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ExprResult Expr(ParseExpression());
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if (Expr.isInvalid()) {
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// If the expression is invalid, skip ahead to the next semicolon or '}'.
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// Not doing this opens us up to the possibility of infinite loops if
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// ParseExpression does not consume any tokens.
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SkipUntil(tok::r_brace, /*StopAtSemi=*/true, /*DontConsume=*/true);
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if (Tok.is(tok::semi))
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ConsumeToken();
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return StmtError();
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}
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// Otherwise, eat the semicolon.
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ExpectAndConsumeSemi(diag::err_expected_semi_after_expr);
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return Actions.ActOnExprStmt(Actions.MakeFullExpr(Expr.get()));
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}
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case tok::kw_case: // C99 6.8.1: labeled-statement
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return ParseCaseStatement(attrs);
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case tok::kw_default: // C99 6.8.1: labeled-statement
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return ParseDefaultStatement(attrs);
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case tok::l_brace: // C99 6.8.2: compound-statement
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return ParseCompoundStatement(attrs);
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case tok::semi: { // C99 6.8.3p3: expression[opt] ';'
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bool LeadingEmptyMacro = Tok.hasLeadingEmptyMacro();
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return Actions.ActOnNullStmt(ConsumeToken(), LeadingEmptyMacro);
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}
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case tok::kw_if: // C99 6.8.4.1: if-statement
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return ParseIfStatement(attrs);
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case tok::kw_switch: // C99 6.8.4.2: switch-statement
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return ParseSwitchStatement(attrs);
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case tok::kw_while: // C99 6.8.5.1: while-statement
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return ParseWhileStatement(attrs);
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case tok::kw_do: // C99 6.8.5.2: do-statement
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Res = ParseDoStatement(attrs);
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SemiError = "do/while";
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break;
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case tok::kw_for: // C99 6.8.5.3: for-statement
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return ParseForStatement(attrs);
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case tok::kw_goto: // C99 6.8.6.1: goto-statement
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Res = ParseGotoStatement(attrs);
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SemiError = "goto";
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break;
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case tok::kw_continue: // C99 6.8.6.2: continue-statement
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Res = ParseContinueStatement(attrs);
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SemiError = "continue";
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break;
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case tok::kw_break: // C99 6.8.6.3: break-statement
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Res = ParseBreakStatement(attrs);
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SemiError = "break";
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break;
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case tok::kw_return: // C99 6.8.6.4: return-statement
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Res = ParseReturnStatement(attrs);
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SemiError = "return";
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break;
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case tok::kw_asm: {
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ProhibitAttributes(attrs);
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bool msAsm = false;
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Res = ParseAsmStatement(msAsm);
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Res = Actions.ActOnFinishFullStmt(Res.get());
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if (msAsm) return move(Res);
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SemiError = "asm";
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break;
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}
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case tok::kw_try: // C++ 15: try-block
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return ParseCXXTryBlock(attrs);
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}
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// If we reached this code, the statement must end in a semicolon.
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if (Tok.is(tok::semi)) {
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ConsumeToken();
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} else if (!Res.isInvalid()) {
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// If the result was valid, then we do want to diagnose this. Use
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// ExpectAndConsume to emit the diagnostic, even though we know it won't
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// succeed.
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ExpectAndConsume(tok::semi, diag::err_expected_semi_after_stmt, SemiError);
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// Skip until we see a } or ;, but don't eat it.
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SkipUntil(tok::r_brace, true, true);
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}
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return move(Res);
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}
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/// ParseLabeledStatement - We have an identifier and a ':' after it.
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///
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/// labeled-statement:
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/// identifier ':' statement
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/// [GNU] identifier ':' attributes[opt] statement
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///
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StmtResult Parser::ParseLabeledStatement(ParsedAttributes &attrs) {
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assert(Tok.is(tok::identifier) && Tok.getIdentifierInfo() &&
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"Not an identifier!");
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Token IdentTok = Tok; // Save the whole token.
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ConsumeToken(); // eat the identifier.
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assert(Tok.is(tok::colon) && "Not a label!");
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// identifier ':' statement
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SourceLocation ColonLoc = ConsumeToken();
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// Read label attributes, if present.
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MaybeParseGNUAttributes(attrs);
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StmtResult SubStmt(ParseStatement());
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// Broken substmt shouldn't prevent the label from being added to the AST.
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if (SubStmt.isInvalid())
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SubStmt = Actions.ActOnNullStmt(ColonLoc);
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return Actions.ActOnLabelStmt(IdentTok.getLocation(),
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IdentTok.getIdentifierInfo(),
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ColonLoc, SubStmt.get(), attrs.getList());
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}
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/// ParseCaseStatement
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/// labeled-statement:
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/// 'case' constant-expression ':' statement
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/// [GNU] 'case' constant-expression '...' constant-expression ':' statement
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///
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StmtResult Parser::ParseCaseStatement(ParsedAttributes &attrs) {
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assert(Tok.is(tok::kw_case) && "Not a case stmt!");
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// FIXME: Use attributes?
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// It is very very common for code to contain many case statements recursively
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// nested, as in (but usually without indentation):
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// case 1:
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// case 2:
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// case 3:
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// case 4:
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// case 5: etc.
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//
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// Parsing this naively works, but is both inefficient and can cause us to run
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// out of stack space in our recursive descent parser. As a special case,
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// flatten this recursion into an iterative loop. This is complex and gross,
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// but all the grossness is constrained to ParseCaseStatement (and some
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// wierdness in the actions), so this is just local grossness :).
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// TopLevelCase - This is the highest level we have parsed. 'case 1' in the
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// example above.
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StmtResult TopLevelCase(true);
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// DeepestParsedCaseStmt - This is the deepest statement we have parsed, which
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// gets updated each time a new case is parsed, and whose body is unset so
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// far. When parsing 'case 4', this is the 'case 3' node.
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StmtTy *DeepestParsedCaseStmt = 0;
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// While we have case statements, eat and stack them.
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do {
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SourceLocation CaseLoc = ConsumeToken(); // eat the 'case'.
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if (Tok.is(tok::code_completion)) {
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Actions.CodeCompleteCase(getCurScope());
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ConsumeCodeCompletionToken();
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}
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/// We don't want to treat 'case x : y' as a potential typo for 'case x::y'.
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/// Disable this form of error recovery while we're parsing the case
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/// expression.
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ColonProtectionRAIIObject ColonProtection(*this);
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ExprResult LHS(ParseConstantExpression());
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if (LHS.isInvalid()) {
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SkipUntil(tok::colon);
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return StmtError();
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}
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// GNU case range extension.
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SourceLocation DotDotDotLoc;
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ExprResult RHS;
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if (Tok.is(tok::ellipsis)) {
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Diag(Tok, diag::ext_gnu_case_range);
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DotDotDotLoc = ConsumeToken();
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RHS = ParseConstantExpression();
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if (RHS.isInvalid()) {
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SkipUntil(tok::colon);
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return StmtError();
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}
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}
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ColonProtection.restore();
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SourceLocation ColonLoc;
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if (Tok.is(tok::colon)) {
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ColonLoc = ConsumeToken();
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// Treat "case blah;" as a typo for "case blah:".
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} else if (Tok.is(tok::semi)) {
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ColonLoc = ConsumeToken();
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Diag(ColonLoc, diag::err_expected_colon_after) << "'case'"
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<< FixItHint::CreateReplacement(ColonLoc, ":");
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} else {
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SourceLocation ExpectedLoc = PP.getLocForEndOfToken(PrevTokLocation);
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Diag(ExpectedLoc, diag::err_expected_colon_after) << "'case'"
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<< FixItHint::CreateInsertion(ExpectedLoc, ":");
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ColonLoc = ExpectedLoc;
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}
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StmtResult Case =
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Actions.ActOnCaseStmt(CaseLoc, LHS.get(), DotDotDotLoc,
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RHS.get(), ColonLoc);
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// If we had a sema error parsing this case, then just ignore it and
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// continue parsing the sub-stmt.
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if (Case.isInvalid()) {
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if (TopLevelCase.isInvalid()) // No parsed case stmts.
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return ParseStatement();
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// Otherwise, just don't add it as a nested case.
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} else {
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// If this is the first case statement we parsed, it becomes TopLevelCase.
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// Otherwise we link it into the current chain.
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Stmt *NextDeepest = Case.get();
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if (TopLevelCase.isInvalid())
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TopLevelCase = move(Case);
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else
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Actions.ActOnCaseStmtBody(DeepestParsedCaseStmt, Case.get());
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DeepestParsedCaseStmt = NextDeepest;
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}
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// Handle all case statements.
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} while (Tok.is(tok::kw_case));
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assert(!TopLevelCase.isInvalid() && "Should have parsed at least one case!");
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// If we found a non-case statement, start by parsing it.
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StmtResult SubStmt;
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if (Tok.isNot(tok::r_brace)) {
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SubStmt = ParseStatement();
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} else {
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// Nicely diagnose the common error "switch (X) { case 4: }", which is
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// not valid.
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// FIXME: add insertion hint.
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Diag(Tok, diag::err_label_end_of_compound_statement);
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SubStmt = true;
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}
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// Broken sub-stmt shouldn't prevent forming the case statement properly.
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if (SubStmt.isInvalid())
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SubStmt = Actions.ActOnNullStmt(SourceLocation());
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// Install the body into the most deeply-nested case.
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Actions.ActOnCaseStmtBody(DeepestParsedCaseStmt, SubStmt.get());
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// Return the top level parsed statement tree.
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return move(TopLevelCase);
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}
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/// ParseDefaultStatement
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/// labeled-statement:
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/// 'default' ':' statement
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/// Note that this does not parse the 'statement' at the end.
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///
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StmtResult Parser::ParseDefaultStatement(ParsedAttributes &attrs) {
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//FIXME: Use attributes?
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assert(Tok.is(tok::kw_default) && "Not a default stmt!");
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SourceLocation DefaultLoc = ConsumeToken(); // eat the 'default'.
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SourceLocation ColonLoc;
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if (Tok.is(tok::colon)) {
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ColonLoc = ConsumeToken();
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// Treat "default;" as a typo for "default:".
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} else if (Tok.is(tok::semi)) {
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ColonLoc = ConsumeToken();
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Diag(ColonLoc, diag::err_expected_colon_after) << "'default'"
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<< FixItHint::CreateReplacement(ColonLoc, ":");
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} else {
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SourceLocation ExpectedLoc = PP.getLocForEndOfToken(PrevTokLocation);
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Diag(ExpectedLoc, diag::err_expected_colon_after) << "'default'"
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<< FixItHint::CreateInsertion(ExpectedLoc, ":");
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ColonLoc = ExpectedLoc;
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}
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// Diagnose the common error "switch (X) {... default: }", which is not valid.
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if (Tok.is(tok::r_brace)) {
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Diag(Tok, diag::err_label_end_of_compound_statement);
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return StmtError();
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}
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StmtResult SubStmt(ParseStatement());
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if (SubStmt.isInvalid())
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return StmtError();
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return Actions.ActOnDefaultStmt(DefaultLoc, ColonLoc,
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SubStmt.get(), getCurScope());
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}
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/// ParseCompoundStatement - Parse a "{}" block.
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///
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/// compound-statement: [C99 6.8.2]
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/// { block-item-list[opt] }
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/// [GNU] { label-declarations block-item-list } [TODO]
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///
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/// block-item-list:
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/// block-item
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/// block-item-list block-item
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///
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/// block-item:
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/// declaration
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/// [GNU] '__extension__' declaration
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/// statement
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/// [OMP] openmp-directive [TODO]
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///
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/// [GNU] label-declarations:
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/// [GNU] label-declaration
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/// [GNU] label-declarations label-declaration
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///
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/// [GNU] label-declaration:
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/// [GNU] '__label__' identifier-list ';'
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///
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/// [OMP] openmp-directive: [TODO]
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/// [OMP] barrier-directive
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/// [OMP] flush-directive
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///
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StmtResult Parser::ParseCompoundStatement(ParsedAttributes &attrs,
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bool isStmtExpr) {
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//FIXME: Use attributes?
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assert(Tok.is(tok::l_brace) && "Not a compount stmt!");
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// Enter a scope to hold everything within the compound stmt. Compound
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// statements can always hold declarations.
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ParseScope CompoundScope(this, Scope::DeclScope);
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// Parse the statements in the body.
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return ParseCompoundStatementBody(isStmtExpr);
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}
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/// ParseCompoundStatementBody - Parse a sequence of statements and invoke the
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/// ActOnCompoundStmt action. This expects the '{' to be the current token, and
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/// consume the '}' at the end of the block. It does not manipulate the scope
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/// stack.
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StmtResult Parser::ParseCompoundStatementBody(bool isStmtExpr) {
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PrettyStackTraceLoc CrashInfo(PP.getSourceManager(),
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Tok.getLocation(),
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"in compound statement ('{}')");
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InMessageExpressionRAIIObject InMessage(*this, false);
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SourceLocation LBraceLoc = ConsumeBrace(); // eat the '{'.
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// TODO: "__label__ X, Y, Z;" is the GNU "Local Label" extension. These are
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// only allowed at the start of a compound stmt regardless of the language.
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StmtVector Stmts(Actions);
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while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) {
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if (Tok.is(tok::annot_pragma_unused)) {
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HandlePragmaUnused();
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continue;
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}
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StmtResult R;
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if (Tok.isNot(tok::kw___extension__)) {
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R = ParseStatementOrDeclaration(Stmts, false);
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} else {
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// __extension__ can start declarations and it can also be a unary
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// operator for expressions. Consume multiple __extension__ markers here
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// until we can determine which is which.
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// FIXME: This loses extension expressions in the AST!
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SourceLocation ExtLoc = ConsumeToken();
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while (Tok.is(tok::kw___extension__))
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ConsumeToken();
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ParsedAttributesWithRange attrs;
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MaybeParseCXX0XAttributes(attrs);
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// If this is the start of a declaration, parse it as such.
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if (isDeclarationStatement()) {
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// __extension__ silences extension warnings in the subdeclaration.
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// FIXME: Save the __extension__ on the decl as a node somehow?
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ExtensionRAIIObject O(Diags);
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SourceLocation DeclStart = Tok.getLocation(), DeclEnd;
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DeclGroupPtrTy Res = ParseDeclaration(Stmts,
|
|
Declarator::BlockContext, DeclEnd,
|
|
attrs);
|
|
R = Actions.ActOnDeclStmt(Res, DeclStart, DeclEnd);
|
|
} else {
|
|
// Otherwise this was a unary __extension__ marker.
|
|
ExprResult Res(ParseExpressionWithLeadingExtension(ExtLoc));
|
|
|
|
if (Res.isInvalid()) {
|
|
SkipUntil(tok::semi);
|
|
continue;
|
|
}
|
|
|
|
// FIXME: Use attributes?
|
|
// Eat the semicolon at the end of stmt and convert the expr into a
|
|
// statement.
|
|
ExpectAndConsumeSemi(diag::err_expected_semi_after_expr);
|
|
R = Actions.ActOnExprStmt(Actions.MakeFullExpr(Res.get()));
|
|
}
|
|
}
|
|
|
|
if (R.isUsable())
|
|
Stmts.push_back(R.release());
|
|
}
|
|
|
|
// We broke out of the while loop because we found a '}' or EOF.
|
|
if (Tok.isNot(tok::r_brace)) {
|
|
Diag(Tok, diag::err_expected_rbrace);
|
|
Diag(LBraceLoc, diag::note_matching) << "{";
|
|
return StmtError();
|
|
}
|
|
|
|
SourceLocation RBraceLoc = ConsumeBrace();
|
|
return Actions.ActOnCompoundStmt(LBraceLoc, RBraceLoc, move_arg(Stmts),
|
|
isStmtExpr);
|
|
}
|
|
|
|
/// ParseParenExprOrCondition:
|
|
/// [C ] '(' expression ')'
|
|
/// [C++] '(' condition ')' [not allowed if OnlyAllowCondition=true]
|
|
///
|
|
/// This function parses and performs error recovery on the specified condition
|
|
/// or expression (depending on whether we're in C++ or C mode). This function
|
|
/// goes out of its way to recover well. It returns true if there was a parser
|
|
/// error (the right paren couldn't be found), which indicates that the caller
|
|
/// should try to recover harder. It returns false if the condition is
|
|
/// successfully parsed. Note that a successful parse can still have semantic
|
|
/// errors in the condition.
|
|
bool Parser::ParseParenExprOrCondition(ExprResult &ExprResult,
|
|
Decl *&DeclResult,
|
|
SourceLocation Loc,
|
|
bool ConvertToBoolean) {
|
|
SourceLocation LParenLoc = ConsumeParen();
|
|
if (getLang().CPlusPlus)
|
|
ParseCXXCondition(ExprResult, DeclResult, Loc, ConvertToBoolean);
|
|
else {
|
|
ExprResult = ParseExpression();
|
|
DeclResult = 0;
|
|
|
|
// If required, convert to a boolean value.
|
|
if (!ExprResult.isInvalid() && ConvertToBoolean)
|
|
ExprResult
|
|
= Actions.ActOnBooleanCondition(getCurScope(), Loc, ExprResult.get());
|
|
}
|
|
|
|
// If the parser was confused by the condition and we don't have a ')', try to
|
|
// recover by skipping ahead to a semi and bailing out. If condexp is
|
|
// semantically invalid but we have well formed code, keep going.
|
|
if (ExprResult.isInvalid() && !DeclResult && Tok.isNot(tok::r_paren)) {
|
|
SkipUntil(tok::semi);
|
|
// Skipping may have stopped if it found the containing ')'. If so, we can
|
|
// continue parsing the if statement.
|
|
if (Tok.isNot(tok::r_paren))
|
|
return true;
|
|
}
|
|
|
|
// Otherwise the condition is valid or the rparen is present.
|
|
MatchRHSPunctuation(tok::r_paren, LParenLoc);
|
|
return false;
|
|
}
|
|
|
|
|
|
/// ParseIfStatement
|
|
/// if-statement: [C99 6.8.4.1]
|
|
/// 'if' '(' expression ')' statement
|
|
/// 'if' '(' expression ')' statement 'else' statement
|
|
/// [C++] 'if' '(' condition ')' statement
|
|
/// [C++] 'if' '(' condition ')' statement 'else' statement
|
|
///
|
|
StmtResult Parser::ParseIfStatement(ParsedAttributes &attrs) {
|
|
// FIXME: Use attributes?
|
|
|
|
assert(Tok.is(tok::kw_if) && "Not an if stmt!");
|
|
SourceLocation IfLoc = ConsumeToken(); // eat the 'if'.
|
|
|
|
if (Tok.isNot(tok::l_paren)) {
|
|
Diag(Tok, diag::err_expected_lparen_after) << "if";
|
|
SkipUntil(tok::semi);
|
|
return StmtError();
|
|
}
|
|
|
|
bool C99orCXX = getLang().C99 || getLang().CPlusPlus;
|
|
|
|
// C99 6.8.4p3 - In C99, the if statement is a block. This is not
|
|
// the case for C90.
|
|
//
|
|
// C++ 6.4p3:
|
|
// A name introduced by a declaration in a condition is in scope from its
|
|
// point of declaration until the end of the substatements controlled by the
|
|
// condition.
|
|
// C++ 3.3.2p4:
|
|
// Names declared in the for-init-statement, and in the condition of if,
|
|
// while, for, and switch statements are local to the if, while, for, or
|
|
// switch statement (including the controlled statement).
|
|
//
|
|
ParseScope IfScope(this, Scope::DeclScope | Scope::ControlScope, C99orCXX);
|
|
|
|
// Parse the condition.
|
|
ExprResult CondExp;
|
|
Decl *CondVar = 0;
|
|
if (ParseParenExprOrCondition(CondExp, CondVar, IfLoc, true))
|
|
return StmtError();
|
|
|
|
FullExprArg FullCondExp(Actions.MakeFullExpr(CondExp.get()));
|
|
|
|
// C99 6.8.4p3 - In C99, the body of the if statement is a scope, even if
|
|
// there is no compound stmt. C90 does not have this clause. We only do this
|
|
// if the body isn't a compound statement to avoid push/pop in common cases.
|
|
//
|
|
// C++ 6.4p1:
|
|
// The substatement in a selection-statement (each substatement, in the else
|
|
// form of the if statement) implicitly defines a local scope.
|
|
//
|
|
// For C++ we create a scope for the condition and a new scope for
|
|
// substatements because:
|
|
// -When the 'then' scope exits, we want the condition declaration to still be
|
|
// active for the 'else' scope too.
|
|
// -Sema will detect name clashes by considering declarations of a
|
|
// 'ControlScope' as part of its direct subscope.
|
|
// -If we wanted the condition and substatement to be in the same scope, we
|
|
// would have to notify ParseStatement not to create a new scope. It's
|
|
// simpler to let it create a new scope.
|
|
//
|
|
ParseScope InnerScope(this, Scope::DeclScope,
|
|
C99orCXX && Tok.isNot(tok::l_brace));
|
|
|
|
// Read the 'then' stmt.
|
|
SourceLocation ThenStmtLoc = Tok.getLocation();
|
|
StmtResult ThenStmt(ParseStatement());
|
|
|
|
// Pop the 'if' scope if needed.
|
|
InnerScope.Exit();
|
|
|
|
// If it has an else, parse it.
|
|
SourceLocation ElseLoc;
|
|
SourceLocation ElseStmtLoc;
|
|
StmtResult ElseStmt;
|
|
|
|
if (Tok.is(tok::kw_else)) {
|
|
ElseLoc = ConsumeToken();
|
|
ElseStmtLoc = Tok.getLocation();
|
|
|
|
// C99 6.8.4p3 - In C99, the body of the if statement is a scope, even if
|
|
// there is no compound stmt. C90 does not have this clause. We only do
|
|
// this if the body isn't a compound statement to avoid push/pop in common
|
|
// cases.
|
|
//
|
|
// C++ 6.4p1:
|
|
// The substatement in a selection-statement (each substatement, in the else
|
|
// form of the if statement) implicitly defines a local scope.
|
|
//
|
|
ParseScope InnerScope(this, Scope::DeclScope,
|
|
C99orCXX && Tok.isNot(tok::l_brace));
|
|
|
|
ElseStmt = ParseStatement();
|
|
|
|
// Pop the 'else' scope if needed.
|
|
InnerScope.Exit();
|
|
}
|
|
|
|
IfScope.Exit();
|
|
|
|
// If the condition was invalid, discard the if statement. We could recover
|
|
// better by replacing it with a valid expr, but don't do that yet.
|
|
if (CondExp.isInvalid() && !CondVar)
|
|
return StmtError();
|
|
|
|
// If the then or else stmt is invalid and the other is valid (and present),
|
|
// make turn the invalid one into a null stmt to avoid dropping the other
|
|
// part. If both are invalid, return error.
|
|
if ((ThenStmt.isInvalid() && ElseStmt.isInvalid()) ||
|
|
(ThenStmt.isInvalid() && ElseStmt.get() == 0) ||
|
|
(ThenStmt.get() == 0 && ElseStmt.isInvalid())) {
|
|
// Both invalid, or one is invalid and other is non-present: return error.
|
|
return StmtError();
|
|
}
|
|
|
|
// Now if either are invalid, replace with a ';'.
|
|
if (ThenStmt.isInvalid())
|
|
ThenStmt = Actions.ActOnNullStmt(ThenStmtLoc);
|
|
if (ElseStmt.isInvalid())
|
|
ElseStmt = Actions.ActOnNullStmt(ElseStmtLoc);
|
|
|
|
return Actions.ActOnIfStmt(IfLoc, FullCondExp, CondVar, ThenStmt.get(),
|
|
ElseLoc, ElseStmt.get());
|
|
}
|
|
|
|
/// ParseSwitchStatement
|
|
/// switch-statement:
|
|
/// 'switch' '(' expression ')' statement
|
|
/// [C++] 'switch' '(' condition ')' statement
|
|
StmtResult Parser::ParseSwitchStatement(ParsedAttributes &attrs) {
|
|
// FIXME: Use attributes?
|
|
|
|
assert(Tok.is(tok::kw_switch) && "Not a switch stmt!");
|
|
SourceLocation SwitchLoc = ConsumeToken(); // eat the 'switch'.
|
|
|
|
if (Tok.isNot(tok::l_paren)) {
|
|
Diag(Tok, diag::err_expected_lparen_after) << "switch";
|
|
SkipUntil(tok::semi);
|
|
return StmtError();
|
|
}
|
|
|
|
bool C99orCXX = getLang().C99 || getLang().CPlusPlus;
|
|
|
|
// C99 6.8.4p3 - In C99, the switch statement is a block. This is
|
|
// not the case for C90. Start the switch scope.
|
|
//
|
|
// C++ 6.4p3:
|
|
// A name introduced by a declaration in a condition is in scope from its
|
|
// point of declaration until the end of the substatements controlled by the
|
|
// condition.
|
|
// C++ 3.3.2p4:
|
|
// Names declared in the for-init-statement, and in the condition of if,
|
|
// while, for, and switch statements are local to the if, while, for, or
|
|
// switch statement (including the controlled statement).
|
|
//
|
|
unsigned ScopeFlags = Scope::BreakScope;
|
|
if (C99orCXX)
|
|
ScopeFlags |= Scope::DeclScope | Scope::ControlScope;
|
|
ParseScope SwitchScope(this, ScopeFlags);
|
|
|
|
// Parse the condition.
|
|
ExprResult Cond;
|
|
Decl *CondVar = 0;
|
|
if (ParseParenExprOrCondition(Cond, CondVar, SwitchLoc, false))
|
|
return StmtError();
|
|
|
|
StmtResult Switch
|
|
= Actions.ActOnStartOfSwitchStmt(SwitchLoc, Cond.get(), CondVar);
|
|
|
|
if (Switch.isInvalid()) {
|
|
// Skip the switch body.
|
|
// FIXME: This is not optimal recovery, but parsing the body is more
|
|
// dangerous due to the presence of case and default statements, which
|
|
// will have no place to connect back with the switch.
|
|
if (Tok.is(tok::l_brace)) {
|
|
ConsumeBrace();
|
|
SkipUntil(tok::r_brace, false, false);
|
|
} else
|
|
SkipUntil(tok::semi);
|
|
return move(Switch);
|
|
}
|
|
|
|
// C99 6.8.4p3 - In C99, the body of the switch statement is a scope, even if
|
|
// there is no compound stmt. C90 does not have this clause. We only do this
|
|
// if the body isn't a compound statement to avoid push/pop in common cases.
|
|
//
|
|
// C++ 6.4p1:
|
|
// The substatement in a selection-statement (each substatement, in the else
|
|
// form of the if statement) implicitly defines a local scope.
|
|
//
|
|
// See comments in ParseIfStatement for why we create a scope for the
|
|
// condition and a new scope for substatement in C++.
|
|
//
|
|
ParseScope InnerScope(this, Scope::DeclScope,
|
|
C99orCXX && Tok.isNot(tok::l_brace));
|
|
|
|
// Read the body statement.
|
|
StmtResult Body(ParseStatement());
|
|
|
|
// Pop the scopes.
|
|
InnerScope.Exit();
|
|
SwitchScope.Exit();
|
|
|
|
if (Body.isInvalid())
|
|
// FIXME: Remove the case statement list from the Switch statement.
|
|
Body = Actions.ActOnNullStmt(Tok.getLocation());
|
|
|
|
return Actions.ActOnFinishSwitchStmt(SwitchLoc, Switch.get(), Body.get());
|
|
}
|
|
|
|
/// ParseWhileStatement
|
|
/// while-statement: [C99 6.8.5.1]
|
|
/// 'while' '(' expression ')' statement
|
|
/// [C++] 'while' '(' condition ')' statement
|
|
StmtResult Parser::ParseWhileStatement(ParsedAttributes &attrs) {
|
|
// FIXME: Use attributes?
|
|
|
|
assert(Tok.is(tok::kw_while) && "Not a while stmt!");
|
|
SourceLocation WhileLoc = Tok.getLocation();
|
|
ConsumeToken(); // eat the 'while'.
|
|
|
|
if (Tok.isNot(tok::l_paren)) {
|
|
Diag(Tok, diag::err_expected_lparen_after) << "while";
|
|
SkipUntil(tok::semi);
|
|
return StmtError();
|
|
}
|
|
|
|
bool C99orCXX = getLang().C99 || getLang().CPlusPlus;
|
|
|
|
// C99 6.8.5p5 - In C99, the while statement is a block. This is not
|
|
// the case for C90. Start the loop scope.
|
|
//
|
|
// C++ 6.4p3:
|
|
// A name introduced by a declaration in a condition is in scope from its
|
|
// point of declaration until the end of the substatements controlled by the
|
|
// condition.
|
|
// C++ 3.3.2p4:
|
|
// Names declared in the for-init-statement, and in the condition of if,
|
|
// while, for, and switch statements are local to the if, while, for, or
|
|
// switch statement (including the controlled statement).
|
|
//
|
|
unsigned ScopeFlags;
|
|
if (C99orCXX)
|
|
ScopeFlags = Scope::BreakScope | Scope::ContinueScope |
|
|
Scope::DeclScope | Scope::ControlScope;
|
|
else
|
|
ScopeFlags = Scope::BreakScope | Scope::ContinueScope;
|
|
ParseScope WhileScope(this, ScopeFlags);
|
|
|
|
// Parse the condition.
|
|
ExprResult Cond;
|
|
Decl *CondVar = 0;
|
|
if (ParseParenExprOrCondition(Cond, CondVar, WhileLoc, true))
|
|
return StmtError();
|
|
|
|
FullExprArg FullCond(Actions.MakeFullExpr(Cond.get()));
|
|
|
|
// C99 6.8.5p5 - In C99, the body of the if statement is a scope, even if
|
|
// there is no compound stmt. C90 does not have this clause. We only do this
|
|
// if the body isn't a compound statement to avoid push/pop in common cases.
|
|
//
|
|
// C++ 6.5p2:
|
|
// The substatement in an iteration-statement implicitly defines a local scope
|
|
// which is entered and exited each time through the loop.
|
|
//
|
|
// See comments in ParseIfStatement for why we create a scope for the
|
|
// condition and a new scope for substatement in C++.
|
|
//
|
|
ParseScope InnerScope(this, Scope::DeclScope,
|
|
C99orCXX && Tok.isNot(tok::l_brace));
|
|
|
|
// Read the body statement.
|
|
StmtResult Body(ParseStatement());
|
|
|
|
// Pop the body scope if needed.
|
|
InnerScope.Exit();
|
|
WhileScope.Exit();
|
|
|
|
if ((Cond.isInvalid() && !CondVar) || Body.isInvalid())
|
|
return StmtError();
|
|
|
|
return Actions.ActOnWhileStmt(WhileLoc, FullCond, CondVar, Body.get());
|
|
}
|
|
|
|
/// ParseDoStatement
|
|
/// do-statement: [C99 6.8.5.2]
|
|
/// 'do' statement 'while' '(' expression ')' ';'
|
|
/// Note: this lets the caller parse the end ';'.
|
|
StmtResult Parser::ParseDoStatement(ParsedAttributes &attrs) {
|
|
// FIXME: Use attributes?
|
|
|
|
assert(Tok.is(tok::kw_do) && "Not a do stmt!");
|
|
SourceLocation DoLoc = ConsumeToken(); // eat the 'do'.
|
|
|
|
// C99 6.8.5p5 - In C99, the do statement is a block. This is not
|
|
// the case for C90. Start the loop scope.
|
|
unsigned ScopeFlags;
|
|
if (getLang().C99)
|
|
ScopeFlags = Scope::BreakScope | Scope::ContinueScope | Scope::DeclScope;
|
|
else
|
|
ScopeFlags = Scope::BreakScope | Scope::ContinueScope;
|
|
|
|
ParseScope DoScope(this, ScopeFlags);
|
|
|
|
// C99 6.8.5p5 - In C99, the body of the if statement is a scope, even if
|
|
// there is no compound stmt. C90 does not have this clause. We only do this
|
|
// if the body isn't a compound statement to avoid push/pop in common cases.
|
|
//
|
|
// C++ 6.5p2:
|
|
// The substatement in an iteration-statement implicitly defines a local scope
|
|
// which is entered and exited each time through the loop.
|
|
//
|
|
ParseScope InnerScope(this, Scope::DeclScope,
|
|
(getLang().C99 || getLang().CPlusPlus) &&
|
|
Tok.isNot(tok::l_brace));
|
|
|
|
// Read the body statement.
|
|
StmtResult Body(ParseStatement());
|
|
|
|
// Pop the body scope if needed.
|
|
InnerScope.Exit();
|
|
|
|
if (Tok.isNot(tok::kw_while)) {
|
|
if (!Body.isInvalid()) {
|
|
Diag(Tok, diag::err_expected_while);
|
|
Diag(DoLoc, diag::note_matching) << "do";
|
|
SkipUntil(tok::semi, false, true);
|
|
}
|
|
return StmtError();
|
|
}
|
|
SourceLocation WhileLoc = ConsumeToken();
|
|
|
|
if (Tok.isNot(tok::l_paren)) {
|
|
Diag(Tok, diag::err_expected_lparen_after) << "do/while";
|
|
SkipUntil(tok::semi, false, true);
|
|
return StmtError();
|
|
}
|
|
|
|
// Parse the parenthesized condition.
|
|
SourceLocation LPLoc = ConsumeParen();
|
|
ExprResult Cond = ParseExpression();
|
|
SourceLocation RPLoc = MatchRHSPunctuation(tok::r_paren, LPLoc);
|
|
DoScope.Exit();
|
|
|
|
if (Cond.isInvalid() || Body.isInvalid())
|
|
return StmtError();
|
|
|
|
return Actions.ActOnDoStmt(DoLoc, Body.get(), WhileLoc, LPLoc,
|
|
Cond.get(), RPLoc);
|
|
}
|
|
|
|
/// ParseForStatement
|
|
/// for-statement: [C99 6.8.5.3]
|
|
/// 'for' '(' expr[opt] ';' expr[opt] ';' expr[opt] ')' statement
|
|
/// 'for' '(' declaration expr[opt] ';' expr[opt] ')' statement
|
|
/// [C++] 'for' '(' for-init-statement condition[opt] ';' expression[opt] ')'
|
|
/// [C++] statement
|
|
/// [OBJC2] 'for' '(' declaration 'in' expr ')' statement
|
|
/// [OBJC2] 'for' '(' expr 'in' expr ')' statement
|
|
///
|
|
/// [C++] for-init-statement:
|
|
/// [C++] expression-statement
|
|
/// [C++] simple-declaration
|
|
///
|
|
StmtResult Parser::ParseForStatement(ParsedAttributes &attrs) {
|
|
// FIXME: Use attributes?
|
|
|
|
assert(Tok.is(tok::kw_for) && "Not a for stmt!");
|
|
SourceLocation ForLoc = ConsumeToken(); // eat the 'for'.
|
|
|
|
if (Tok.isNot(tok::l_paren)) {
|
|
Diag(Tok, diag::err_expected_lparen_after) << "for";
|
|
SkipUntil(tok::semi);
|
|
return StmtError();
|
|
}
|
|
|
|
bool C99orCXXorObjC = getLang().C99 || getLang().CPlusPlus || getLang().ObjC1;
|
|
|
|
// C99 6.8.5p5 - In C99, the for statement is a block. This is not
|
|
// the case for C90. Start the loop scope.
|
|
//
|
|
// C++ 6.4p3:
|
|
// A name introduced by a declaration in a condition is in scope from its
|
|
// point of declaration until the end of the substatements controlled by the
|
|
// condition.
|
|
// C++ 3.3.2p4:
|
|
// Names declared in the for-init-statement, and in the condition of if,
|
|
// while, for, and switch statements are local to the if, while, for, or
|
|
// switch statement (including the controlled statement).
|
|
// C++ 6.5.3p1:
|
|
// Names declared in the for-init-statement are in the same declarative-region
|
|
// as those declared in the condition.
|
|
//
|
|
unsigned ScopeFlags;
|
|
if (C99orCXXorObjC)
|
|
ScopeFlags = Scope::BreakScope | Scope::ContinueScope |
|
|
Scope::DeclScope | Scope::ControlScope;
|
|
else
|
|
ScopeFlags = Scope::BreakScope | Scope::ContinueScope;
|
|
|
|
ParseScope ForScope(this, ScopeFlags);
|
|
|
|
SourceLocation LParenLoc = ConsumeParen();
|
|
ExprResult Value;
|
|
|
|
bool ForEach = false;
|
|
StmtResult FirstPart;
|
|
bool SecondPartIsInvalid = false;
|
|
FullExprArg SecondPart(Actions);
|
|
ExprResult Collection;
|
|
FullExprArg ThirdPart(Actions);
|
|
Decl *SecondVar = 0;
|
|
|
|
if (Tok.is(tok::code_completion)) {
|
|
Actions.CodeCompleteOrdinaryName(getCurScope(),
|
|
C99orCXXorObjC? Sema::PCC_ForInit
|
|
: Sema::PCC_Expression);
|
|
ConsumeCodeCompletionToken();
|
|
}
|
|
|
|
// Parse the first part of the for specifier.
|
|
if (Tok.is(tok::semi)) { // for (;
|
|
// no first part, eat the ';'.
|
|
ConsumeToken();
|
|
} else if (isSimpleDeclaration()) { // for (int X = 4;
|
|
// Parse declaration, which eats the ';'.
|
|
if (!C99orCXXorObjC) // Use of C99-style for loops in C90 mode?
|
|
Diag(Tok, diag::ext_c99_variable_decl_in_for_loop);
|
|
|
|
ParsedAttributesWithRange attrs;
|
|
MaybeParseCXX0XAttributes(attrs);
|
|
|
|
SourceLocation DeclStart = Tok.getLocation(), DeclEnd;
|
|
StmtVector Stmts(Actions);
|
|
DeclGroupPtrTy DG = ParseSimpleDeclaration(Stmts, Declarator::ForContext,
|
|
DeclEnd, attrs, false);
|
|
FirstPart = Actions.ActOnDeclStmt(DG, DeclStart, Tok.getLocation());
|
|
|
|
if (Tok.is(tok::semi)) { // for (int x = 4;
|
|
ConsumeToken();
|
|
} else if ((ForEach = isTokIdentifier_in())) {
|
|
Actions.ActOnForEachDeclStmt(DG);
|
|
// ObjC: for (id x in expr)
|
|
ConsumeToken(); // consume 'in'
|
|
|
|
if (Tok.is(tok::code_completion)) {
|
|
Actions.CodeCompleteObjCForCollection(getCurScope(), DG);
|
|
ConsumeCodeCompletionToken();
|
|
}
|
|
Collection = ParseExpression();
|
|
} else {
|
|
Diag(Tok, diag::err_expected_semi_for);
|
|
SkipUntil(tok::semi);
|
|
}
|
|
} else {
|
|
Value = ParseExpression();
|
|
|
|
ForEach = isTokIdentifier_in();
|
|
|
|
// Turn the expression into a stmt.
|
|
if (!Value.isInvalid()) {
|
|
if (ForEach)
|
|
FirstPart = Actions.ActOnForEachLValueExpr(Value.get());
|
|
else
|
|
FirstPart = Actions.ActOnExprStmt(Actions.MakeFullExpr(Value.get()));
|
|
}
|
|
|
|
if (Tok.is(tok::semi)) {
|
|
ConsumeToken();
|
|
} else if (ForEach) {
|
|
ConsumeToken(); // consume 'in'
|
|
|
|
if (Tok.is(tok::code_completion)) {
|
|
Actions.CodeCompleteObjCForCollection(getCurScope(), DeclGroupPtrTy());
|
|
ConsumeCodeCompletionToken();
|
|
}
|
|
Collection = ParseExpression();
|
|
} else {
|
|
if (!Value.isInvalid()) Diag(Tok, diag::err_expected_semi_for);
|
|
SkipUntil(tok::semi);
|
|
}
|
|
}
|
|
if (!ForEach) {
|
|
assert(!SecondPart.get() && "Shouldn't have a second expression yet.");
|
|
// Parse the second part of the for specifier.
|
|
if (Tok.is(tok::semi)) { // for (...;;
|
|
// no second part.
|
|
} else {
|
|
ExprResult Second;
|
|
if (getLang().CPlusPlus)
|
|
ParseCXXCondition(Second, SecondVar, ForLoc, true);
|
|
else {
|
|
Second = ParseExpression();
|
|
if (!Second.isInvalid())
|
|
Second = Actions.ActOnBooleanCondition(getCurScope(), ForLoc,
|
|
Second.get());
|
|
}
|
|
SecondPartIsInvalid = Second.isInvalid();
|
|
SecondPart = Actions.MakeFullExpr(Second.get());
|
|
}
|
|
|
|
if (Tok.is(tok::semi)) {
|
|
ConsumeToken();
|
|
} else {
|
|
if (!SecondPartIsInvalid || SecondVar)
|
|
Diag(Tok, diag::err_expected_semi_for);
|
|
SkipUntil(tok::semi);
|
|
}
|
|
|
|
// Parse the third part of the for specifier.
|
|
if (Tok.isNot(tok::r_paren)) { // for (...;...;)
|
|
ExprResult Third = ParseExpression();
|
|
ThirdPart = Actions.MakeFullExpr(Third.take());
|
|
}
|
|
}
|
|
// Match the ')'.
|
|
SourceLocation RParenLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc);
|
|
|
|
// C99 6.8.5p5 - In C99, the body of the if statement is a scope, even if
|
|
// there is no compound stmt. C90 does not have this clause. We only do this
|
|
// if the body isn't a compound statement to avoid push/pop in common cases.
|
|
//
|
|
// C++ 6.5p2:
|
|
// The substatement in an iteration-statement implicitly defines a local scope
|
|
// which is entered and exited each time through the loop.
|
|
//
|
|
// See comments in ParseIfStatement for why we create a scope for
|
|
// for-init-statement/condition and a new scope for substatement in C++.
|
|
//
|
|
ParseScope InnerScope(this, Scope::DeclScope,
|
|
C99orCXXorObjC && Tok.isNot(tok::l_brace));
|
|
|
|
// Read the body statement.
|
|
StmtResult Body(ParseStatement());
|
|
|
|
// Pop the body scope if needed.
|
|
InnerScope.Exit();
|
|
|
|
// Leave the for-scope.
|
|
ForScope.Exit();
|
|
|
|
if (Body.isInvalid())
|
|
return StmtError();
|
|
|
|
if (!ForEach)
|
|
return Actions.ActOnForStmt(ForLoc, LParenLoc, FirstPart.take(), SecondPart,
|
|
SecondVar, ThirdPart, RParenLoc, Body.take());
|
|
|
|
// FIXME: It isn't clear how to communicate the late destruction of
|
|
// C++ temporaries used to create the collection.
|
|
return Actions.ActOnObjCForCollectionStmt(ForLoc, LParenLoc, FirstPart.take(),
|
|
Collection.take(), RParenLoc,
|
|
Body.take());
|
|
}
|
|
|
|
/// ParseGotoStatement
|
|
/// jump-statement:
|
|
/// 'goto' identifier ';'
|
|
/// [GNU] 'goto' '*' expression ';'
|
|
///
|
|
/// Note: this lets the caller parse the end ';'.
|
|
///
|
|
StmtResult Parser::ParseGotoStatement(ParsedAttributes &attrs) {
|
|
// FIXME: Use attributes?
|
|
|
|
assert(Tok.is(tok::kw_goto) && "Not a goto stmt!");
|
|
SourceLocation GotoLoc = ConsumeToken(); // eat the 'goto'.
|
|
|
|
StmtResult Res;
|
|
if (Tok.is(tok::identifier)) {
|
|
Res = Actions.ActOnGotoStmt(GotoLoc, Tok.getLocation(),
|
|
Tok.getIdentifierInfo());
|
|
ConsumeToken();
|
|
} else if (Tok.is(tok::star)) {
|
|
// GNU indirect goto extension.
|
|
Diag(Tok, diag::ext_gnu_indirect_goto);
|
|
SourceLocation StarLoc = ConsumeToken();
|
|
ExprResult R(ParseExpression());
|
|
if (R.isInvalid()) { // Skip to the semicolon, but don't consume it.
|
|
SkipUntil(tok::semi, false, true);
|
|
return StmtError();
|
|
}
|
|
Res = Actions.ActOnIndirectGotoStmt(GotoLoc, StarLoc, R.take());
|
|
} else {
|
|
Diag(Tok, diag::err_expected_ident);
|
|
return StmtError();
|
|
}
|
|
|
|
return move(Res);
|
|
}
|
|
|
|
/// ParseContinueStatement
|
|
/// jump-statement:
|
|
/// 'continue' ';'
|
|
///
|
|
/// Note: this lets the caller parse the end ';'.
|
|
///
|
|
StmtResult Parser::ParseContinueStatement(ParsedAttributes &attrs) {
|
|
// FIXME: Use attributes?
|
|
|
|
SourceLocation ContinueLoc = ConsumeToken(); // eat the 'continue'.
|
|
return Actions.ActOnContinueStmt(ContinueLoc, getCurScope());
|
|
}
|
|
|
|
/// ParseBreakStatement
|
|
/// jump-statement:
|
|
/// 'break' ';'
|
|
///
|
|
/// Note: this lets the caller parse the end ';'.
|
|
///
|
|
StmtResult Parser::ParseBreakStatement(ParsedAttributes &attrs) {
|
|
// FIXME: Use attributes?
|
|
|
|
SourceLocation BreakLoc = ConsumeToken(); // eat the 'break'.
|
|
return Actions.ActOnBreakStmt(BreakLoc, getCurScope());
|
|
}
|
|
|
|
/// ParseReturnStatement
|
|
/// jump-statement:
|
|
/// 'return' expression[opt] ';'
|
|
StmtResult Parser::ParseReturnStatement(ParsedAttributes &attrs) {
|
|
// FIXME: Use attributes?
|
|
|
|
assert(Tok.is(tok::kw_return) && "Not a return stmt!");
|
|
SourceLocation ReturnLoc = ConsumeToken(); // eat the 'return'.
|
|
|
|
ExprResult R;
|
|
if (Tok.isNot(tok::semi)) {
|
|
if (Tok.is(tok::code_completion)) {
|
|
Actions.CodeCompleteReturn(getCurScope());
|
|
ConsumeCodeCompletionToken();
|
|
SkipUntil(tok::semi, false, true);
|
|
return StmtError();
|
|
}
|
|
|
|
R = ParseExpression();
|
|
if (R.isInvalid()) { // Skip to the semicolon, but don't consume it.
|
|
SkipUntil(tok::semi, false, true);
|
|
return StmtError();
|
|
}
|
|
}
|
|
return Actions.ActOnReturnStmt(ReturnLoc, R.take());
|
|
}
|
|
|
|
/// FuzzyParseMicrosoftAsmStatement. When -fms-extensions is enabled, this
|
|
/// routine is called to skip/ignore tokens that comprise the MS asm statement.
|
|
StmtResult Parser::FuzzyParseMicrosoftAsmStatement(SourceLocation AsmLoc) {
|
|
SourceLocation EndLoc;
|
|
if (Tok.is(tok::l_brace)) {
|
|
unsigned short savedBraceCount = BraceCount;
|
|
do {
|
|
EndLoc = Tok.getLocation();
|
|
ConsumeAnyToken();
|
|
} while (BraceCount > savedBraceCount && Tok.isNot(tok::eof));
|
|
} else {
|
|
// From the MS website: If used without braces, the __asm keyword means
|
|
// that the rest of the line is an assembly-language statement.
|
|
SourceManager &SrcMgr = PP.getSourceManager();
|
|
SourceLocation TokLoc = Tok.getLocation();
|
|
unsigned LineNo = SrcMgr.getInstantiationLineNumber(TokLoc);
|
|
do {
|
|
EndLoc = TokLoc;
|
|
ConsumeAnyToken();
|
|
TokLoc = Tok.getLocation();
|
|
} while ((SrcMgr.getInstantiationLineNumber(TokLoc) == LineNo) &&
|
|
Tok.isNot(tok::r_brace) && Tok.isNot(tok::semi) &&
|
|
Tok.isNot(tok::eof));
|
|
}
|
|
Token t;
|
|
t.setKind(tok::string_literal);
|
|
t.setLiteralData("\"/*FIXME: not done*/\"");
|
|
t.clearFlag(Token::NeedsCleaning);
|
|
t.setLength(21);
|
|
ExprResult AsmString(Actions.ActOnStringLiteral(&t, 1));
|
|
ExprVector Constraints(Actions);
|
|
ExprVector Exprs(Actions);
|
|
ExprVector Clobbers(Actions);
|
|
return Actions.ActOnAsmStmt(AsmLoc, true, true, 0, 0, 0,
|
|
move_arg(Constraints), move_arg(Exprs),
|
|
AsmString.take(), move_arg(Clobbers),
|
|
EndLoc, true);
|
|
}
|
|
|
|
/// ParseAsmStatement - Parse a GNU extended asm statement.
|
|
/// asm-statement:
|
|
/// gnu-asm-statement
|
|
/// ms-asm-statement
|
|
///
|
|
/// [GNU] gnu-asm-statement:
|
|
/// 'asm' type-qualifier[opt] '(' asm-argument ')' ';'
|
|
///
|
|
/// [GNU] asm-argument:
|
|
/// asm-string-literal
|
|
/// asm-string-literal ':' asm-operands[opt]
|
|
/// asm-string-literal ':' asm-operands[opt] ':' asm-operands[opt]
|
|
/// asm-string-literal ':' asm-operands[opt] ':' asm-operands[opt]
|
|
/// ':' asm-clobbers
|
|
///
|
|
/// [GNU] asm-clobbers:
|
|
/// asm-string-literal
|
|
/// asm-clobbers ',' asm-string-literal
|
|
///
|
|
/// [MS] ms-asm-statement:
|
|
/// '__asm' assembly-instruction ';'[opt]
|
|
/// '__asm' '{' assembly-instruction-list '}' ';'[opt]
|
|
///
|
|
/// [MS] assembly-instruction-list:
|
|
/// assembly-instruction ';'[opt]
|
|
/// assembly-instruction-list ';' assembly-instruction ';'[opt]
|
|
///
|
|
StmtResult Parser::ParseAsmStatement(bool &msAsm) {
|
|
assert(Tok.is(tok::kw_asm) && "Not an asm stmt");
|
|
SourceLocation AsmLoc = ConsumeToken();
|
|
|
|
if (getLang().Microsoft && Tok.isNot(tok::l_paren) && !isTypeQualifier()) {
|
|
msAsm = true;
|
|
return FuzzyParseMicrosoftAsmStatement(AsmLoc);
|
|
}
|
|
DeclSpec DS;
|
|
SourceLocation Loc = Tok.getLocation();
|
|
ParseTypeQualifierListOpt(DS, true, false);
|
|
|
|
// GNU asms accept, but warn, about type-qualifiers other than volatile.
|
|
if (DS.getTypeQualifiers() & DeclSpec::TQ_const)
|
|
Diag(Loc, diag::w_asm_qualifier_ignored) << "const";
|
|
if (DS.getTypeQualifiers() & DeclSpec::TQ_restrict)
|
|
Diag(Loc, diag::w_asm_qualifier_ignored) << "restrict";
|
|
|
|
// Remember if this was a volatile asm.
|
|
bool isVolatile = DS.getTypeQualifiers() & DeclSpec::TQ_volatile;
|
|
if (Tok.isNot(tok::l_paren)) {
|
|
Diag(Tok, diag::err_expected_lparen_after) << "asm";
|
|
SkipUntil(tok::r_paren);
|
|
return StmtError();
|
|
}
|
|
Loc = ConsumeParen();
|
|
|
|
ExprResult AsmString(ParseAsmStringLiteral());
|
|
if (AsmString.isInvalid())
|
|
return StmtError();
|
|
|
|
llvm::SmallVector<IdentifierInfo *, 4> Names;
|
|
ExprVector Constraints(Actions);
|
|
ExprVector Exprs(Actions);
|
|
ExprVector Clobbers(Actions);
|
|
|
|
if (Tok.is(tok::r_paren)) {
|
|
// We have a simple asm expression like 'asm("foo")'.
|
|
SourceLocation RParenLoc = ConsumeParen();
|
|
return Actions.ActOnAsmStmt(AsmLoc, /*isSimple*/ true, isVolatile,
|
|
/*NumOutputs*/ 0, /*NumInputs*/ 0, 0,
|
|
move_arg(Constraints), move_arg(Exprs),
|
|
AsmString.take(), move_arg(Clobbers),
|
|
RParenLoc);
|
|
}
|
|
|
|
// Parse Outputs, if present.
|
|
bool AteExtraColon = false;
|
|
if (Tok.is(tok::colon) || Tok.is(tok::coloncolon)) {
|
|
// In C++ mode, parse "::" like ": :".
|
|
AteExtraColon = Tok.is(tok::coloncolon);
|
|
ConsumeToken();
|
|
|
|
if (!AteExtraColon &&
|
|
ParseAsmOperandsOpt(Names, Constraints, Exprs))
|
|
return StmtError();
|
|
}
|
|
|
|
unsigned NumOutputs = Names.size();
|
|
|
|
// Parse Inputs, if present.
|
|
if (AteExtraColon ||
|
|
Tok.is(tok::colon) || Tok.is(tok::coloncolon)) {
|
|
// In C++ mode, parse "::" like ": :".
|
|
if (AteExtraColon)
|
|
AteExtraColon = false;
|
|
else {
|
|
AteExtraColon = Tok.is(tok::coloncolon);
|
|
ConsumeToken();
|
|
}
|
|
|
|
if (!AteExtraColon &&
|
|
ParseAsmOperandsOpt(Names, Constraints, Exprs))
|
|
return StmtError();
|
|
}
|
|
|
|
assert(Names.size() == Constraints.size() &&
|
|
Constraints.size() == Exprs.size() &&
|
|
"Input operand size mismatch!");
|
|
|
|
unsigned NumInputs = Names.size() - NumOutputs;
|
|
|
|
// Parse the clobbers, if present.
|
|
if (AteExtraColon || Tok.is(tok::colon)) {
|
|
if (!AteExtraColon)
|
|
ConsumeToken();
|
|
|
|
// Parse the asm-string list for clobbers if present.
|
|
if (Tok.isNot(tok::r_paren)) {
|
|
while (1) {
|
|
ExprResult Clobber(ParseAsmStringLiteral());
|
|
|
|
if (Clobber.isInvalid())
|
|
break;
|
|
|
|
Clobbers.push_back(Clobber.release());
|
|
|
|
if (Tok.isNot(tok::comma)) break;
|
|
ConsumeToken();
|
|
}
|
|
}
|
|
}
|
|
|
|
SourceLocation RParenLoc = MatchRHSPunctuation(tok::r_paren, Loc);
|
|
return Actions.ActOnAsmStmt(AsmLoc, false, isVolatile,
|
|
NumOutputs, NumInputs, Names.data(),
|
|
move_arg(Constraints), move_arg(Exprs),
|
|
AsmString.take(), move_arg(Clobbers),
|
|
RParenLoc);
|
|
}
|
|
|
|
/// ParseAsmOperands - Parse the asm-operands production as used by
|
|
/// asm-statement, assuming the leading ':' token was eaten.
|
|
///
|
|
/// [GNU] asm-operands:
|
|
/// asm-operand
|
|
/// asm-operands ',' asm-operand
|
|
///
|
|
/// [GNU] asm-operand:
|
|
/// asm-string-literal '(' expression ')'
|
|
/// '[' identifier ']' asm-string-literal '(' expression ')'
|
|
///
|
|
//
|
|
// FIXME: Avoid unnecessary std::string trashing.
|
|
bool Parser::ParseAsmOperandsOpt(llvm::SmallVectorImpl<IdentifierInfo *> &Names,
|
|
llvm::SmallVectorImpl<ExprTy *> &Constraints,
|
|
llvm::SmallVectorImpl<ExprTy *> &Exprs) {
|
|
// 'asm-operands' isn't present?
|
|
if (!isTokenStringLiteral() && Tok.isNot(tok::l_square))
|
|
return false;
|
|
|
|
while (1) {
|
|
// Read the [id] if present.
|
|
if (Tok.is(tok::l_square)) {
|
|
SourceLocation Loc = ConsumeBracket();
|
|
|
|
if (Tok.isNot(tok::identifier)) {
|
|
Diag(Tok, diag::err_expected_ident);
|
|
SkipUntil(tok::r_paren);
|
|
return true;
|
|
}
|
|
|
|
IdentifierInfo *II = Tok.getIdentifierInfo();
|
|
ConsumeToken();
|
|
|
|
Names.push_back(II);
|
|
MatchRHSPunctuation(tok::r_square, Loc);
|
|
} else
|
|
Names.push_back(0);
|
|
|
|
ExprResult Constraint(ParseAsmStringLiteral());
|
|
if (Constraint.isInvalid()) {
|
|
SkipUntil(tok::r_paren);
|
|
return true;
|
|
}
|
|
Constraints.push_back(Constraint.release());
|
|
|
|
if (Tok.isNot(tok::l_paren)) {
|
|
Diag(Tok, diag::err_expected_lparen_after) << "asm operand";
|
|
SkipUntil(tok::r_paren);
|
|
return true;
|
|
}
|
|
|
|
// Read the parenthesized expression.
|
|
SourceLocation OpenLoc = ConsumeParen();
|
|
ExprResult Res(ParseExpression());
|
|
MatchRHSPunctuation(tok::r_paren, OpenLoc);
|
|
if (Res.isInvalid()) {
|
|
SkipUntil(tok::r_paren);
|
|
return true;
|
|
}
|
|
Exprs.push_back(Res.release());
|
|
// Eat the comma and continue parsing if it exists.
|
|
if (Tok.isNot(tok::comma)) return false;
|
|
ConsumeToken();
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
Decl *Parser::ParseFunctionStatementBody(Decl *Decl) {
|
|
assert(Tok.is(tok::l_brace));
|
|
SourceLocation LBraceLoc = Tok.getLocation();
|
|
|
|
if (PP.isCodeCompletionEnabled())
|
|
if (trySkippingFunctionBodyForCodeCompletion())
|
|
return Actions.ActOnFinishFunctionBody(Decl, 0);
|
|
|
|
PrettyDeclStackTraceEntry CrashInfo(Actions, Decl, LBraceLoc,
|
|
"parsing function body");
|
|
|
|
// Do not enter a scope for the brace, as the arguments are in the same scope
|
|
// (the function body) as the body itself. Instead, just read the statement
|
|
// list and put it into a CompoundStmt for safe keeping.
|
|
StmtResult FnBody(ParseCompoundStatementBody());
|
|
|
|
// If the function body could not be parsed, make a bogus compoundstmt.
|
|
if (FnBody.isInvalid())
|
|
FnBody = Actions.ActOnCompoundStmt(LBraceLoc, LBraceLoc,
|
|
MultiStmtArg(Actions), false);
|
|
|
|
return Actions.ActOnFinishFunctionBody(Decl, FnBody.take());
|
|
}
|
|
|
|
/// ParseFunctionTryBlock - Parse a C++ function-try-block.
|
|
///
|
|
/// function-try-block:
|
|
/// 'try' ctor-initializer[opt] compound-statement handler-seq
|
|
///
|
|
Decl *Parser::ParseFunctionTryBlock(Decl *Decl) {
|
|
assert(Tok.is(tok::kw_try) && "Expected 'try'");
|
|
SourceLocation TryLoc = ConsumeToken();
|
|
|
|
PrettyDeclStackTraceEntry CrashInfo(Actions, Decl, TryLoc,
|
|
"parsing function try block");
|
|
|
|
// Constructor initializer list?
|
|
if (Tok.is(tok::colon))
|
|
ParseConstructorInitializer(Decl);
|
|
|
|
if (PP.isCodeCompletionEnabled())
|
|
if (trySkippingFunctionBodyForCodeCompletion())
|
|
return Actions.ActOnFinishFunctionBody(Decl, 0);
|
|
|
|
SourceLocation LBraceLoc = Tok.getLocation();
|
|
StmtResult FnBody(ParseCXXTryBlockCommon(TryLoc));
|
|
// If we failed to parse the try-catch, we just give the function an empty
|
|
// compound statement as the body.
|
|
if (FnBody.isInvalid())
|
|
FnBody = Actions.ActOnCompoundStmt(LBraceLoc, LBraceLoc,
|
|
MultiStmtArg(Actions), false);
|
|
|
|
return Actions.ActOnFinishFunctionBody(Decl, FnBody.take());
|
|
}
|
|
|
|
bool Parser::trySkippingFunctionBodyForCodeCompletion() {
|
|
assert(Tok.is(tok::l_brace));
|
|
assert(PP.isCodeCompletionEnabled() &&
|
|
"Should only be called when in code-completion mode");
|
|
|
|
// We're in code-completion mode. Skip parsing for all function bodies unless
|
|
// the body contains the code-completion point.
|
|
TentativeParsingAction PA(*this);
|
|
ConsumeBrace();
|
|
if (SkipUntil(tok::r_brace, /*StopAtSemi=*/false, /*DontConsume=*/false,
|
|
/*StopAtCodeCompletion=*/true)) {
|
|
PA.Commit();
|
|
return true;
|
|
}
|
|
|
|
PA.Revert();
|
|
return false;
|
|
}
|
|
|
|
/// ParseCXXTryBlock - Parse a C++ try-block.
|
|
///
|
|
/// try-block:
|
|
/// 'try' compound-statement handler-seq
|
|
///
|
|
StmtResult Parser::ParseCXXTryBlock(ParsedAttributes &attrs) {
|
|
// FIXME: Add attributes?
|
|
|
|
assert(Tok.is(tok::kw_try) && "Expected 'try'");
|
|
|
|
SourceLocation TryLoc = ConsumeToken();
|
|
return ParseCXXTryBlockCommon(TryLoc);
|
|
}
|
|
|
|
/// ParseCXXTryBlockCommon - Parse the common part of try-block and
|
|
/// function-try-block.
|
|
///
|
|
/// try-block:
|
|
/// 'try' compound-statement handler-seq
|
|
///
|
|
/// function-try-block:
|
|
/// 'try' ctor-initializer[opt] compound-statement handler-seq
|
|
///
|
|
/// handler-seq:
|
|
/// handler handler-seq[opt]
|
|
///
|
|
StmtResult Parser::ParseCXXTryBlockCommon(SourceLocation TryLoc) {
|
|
if (Tok.isNot(tok::l_brace))
|
|
return StmtError(Diag(Tok, diag::err_expected_lbrace));
|
|
// FIXME: Possible draft standard bug: attribute-specifier should be allowed?
|
|
ParsedAttributesWithRange attrs;
|
|
StmtResult TryBlock(ParseCompoundStatement(attrs));
|
|
if (TryBlock.isInvalid())
|
|
return move(TryBlock);
|
|
|
|
StmtVector Handlers(Actions);
|
|
MaybeParseCXX0XAttributes(attrs);
|
|
ProhibitAttributes(attrs);
|
|
|
|
if (Tok.isNot(tok::kw_catch))
|
|
return StmtError(Diag(Tok, diag::err_expected_catch));
|
|
while (Tok.is(tok::kw_catch)) {
|
|
StmtResult Handler(ParseCXXCatchBlock());
|
|
if (!Handler.isInvalid())
|
|
Handlers.push_back(Handler.release());
|
|
}
|
|
// Don't bother creating the full statement if we don't have any usable
|
|
// handlers.
|
|
if (Handlers.empty())
|
|
return StmtError();
|
|
|
|
return Actions.ActOnCXXTryBlock(TryLoc, TryBlock.take(), move_arg(Handlers));
|
|
}
|
|
|
|
/// ParseCXXCatchBlock - Parse a C++ catch block, called handler in the standard
|
|
///
|
|
/// handler:
|
|
/// 'catch' '(' exception-declaration ')' compound-statement
|
|
///
|
|
/// exception-declaration:
|
|
/// type-specifier-seq declarator
|
|
/// type-specifier-seq abstract-declarator
|
|
/// type-specifier-seq
|
|
/// '...'
|
|
///
|
|
StmtResult Parser::ParseCXXCatchBlock() {
|
|
assert(Tok.is(tok::kw_catch) && "Expected 'catch'");
|
|
|
|
SourceLocation CatchLoc = ConsumeToken();
|
|
|
|
SourceLocation LParenLoc = Tok.getLocation();
|
|
if (ExpectAndConsume(tok::l_paren, diag::err_expected_lparen))
|
|
return StmtError();
|
|
|
|
// C++ 3.3.2p3:
|
|
// The name in a catch exception-declaration is local to the handler and
|
|
// shall not be redeclared in the outermost block of the handler.
|
|
ParseScope CatchScope(this, Scope::DeclScope | Scope::ControlScope);
|
|
|
|
// exception-declaration is equivalent to '...' or a parameter-declaration
|
|
// without default arguments.
|
|
Decl *ExceptionDecl = 0;
|
|
if (Tok.isNot(tok::ellipsis)) {
|
|
DeclSpec DS;
|
|
if (ParseCXXTypeSpecifierSeq(DS))
|
|
return StmtError();
|
|
Declarator ExDecl(DS, Declarator::CXXCatchContext);
|
|
ParseDeclarator(ExDecl);
|
|
ExceptionDecl = Actions.ActOnExceptionDeclarator(getCurScope(), ExDecl);
|
|
} else
|
|
ConsumeToken();
|
|
|
|
if (MatchRHSPunctuation(tok::r_paren, LParenLoc).isInvalid())
|
|
return StmtError();
|
|
|
|
if (Tok.isNot(tok::l_brace))
|
|
return StmtError(Diag(Tok, diag::err_expected_lbrace));
|
|
|
|
// FIXME: Possible draft standard bug: attribute-specifier should be allowed?
|
|
ParsedAttributes attrs;
|
|
StmtResult Block(ParseCompoundStatement(attrs));
|
|
if (Block.isInvalid())
|
|
return move(Block);
|
|
|
|
return Actions.ActOnCXXCatchBlock(CatchLoc, ExceptionDecl, Block.take());
|
|
}
|