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llvm-project/clang/lib/Parse/ParseStmt.cpp
Douglas Gregor 7bab5ff8e7 Eliminate CXXConditionDeclExpr with extreme prejudice. 
All statements that involve conditions can now hold on to a separate
condition declaration (a VarDecl), and will use a DeclRefExpr
referring to that VarDecl for the condition expression. ForStmts now
have such a VarDecl (I'd missed those in previous commits).

Also, since this change reworks the Action interface for
if/while/switch/for, use FullExprArg for the full expressions in those
expressions, to ensure that we're emitting

Note that we are (still) not generating the right cleanups for
condition variables in for statements. That will be a follow-on
commit.

llvm-svn: 89817
2009-11-25 00:27:52 +00:00

1515 lines
51 KiB
C++
Raw Blame History

//===--- ParseStmt.cpp - Statement and Block Parser -----------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the Statement and Block portions of the Parser
// interface.
//
//===----------------------------------------------------------------------===//
#include "clang/Parse/Parser.h"
#include "ExtensionRAIIObject.h"
#include "clang/Parse/DeclSpec.h"
#include "clang/Parse/Scope.h"
#include "clang/Basic/Diagnostic.h"
#include "clang/Basic/PrettyStackTrace.h"
#include "clang/Basic/SourceManager.h"
using namespace clang;
//===----------------------------------------------------------------------===//
// C99 6.8: Statements and Blocks.
//===----------------------------------------------------------------------===//
/// ParseStatementOrDeclaration - Read 'statement' or 'declaration'.
/// StatementOrDeclaration:
/// statement
/// declaration
///
/// statement:
/// labeled-statement
/// compound-statement
/// expression-statement
/// selection-statement
/// iteration-statement
/// jump-statement
/// [C++] declaration-statement
/// [C++] try-block
/// [OBC] objc-throw-statement
/// [OBC] objc-try-catch-statement
/// [OBC] objc-synchronized-statement
/// [GNU] asm-statement
/// [OMP] openmp-construct [TODO]
///
/// labeled-statement:
/// identifier ':' statement
/// 'case' constant-expression ':' statement
/// 'default' ':' statement
///
/// selection-statement:
/// if-statement
/// switch-statement
///
/// iteration-statement:
/// while-statement
/// do-statement
/// for-statement
///
/// expression-statement:
/// expression[opt] ';'
///
/// jump-statement:
/// 'goto' identifier ';'
/// 'continue' ';'
/// 'break' ';'
/// 'return' expression[opt] ';'
/// [GNU] 'goto' '*' expression ';'
///
/// [OBC] objc-throw-statement:
/// [OBC] '@' 'throw' expression ';'
/// [OBC] '@' 'throw' ';'
///
Parser::OwningStmtResult
Parser::ParseStatementOrDeclaration(bool OnlyStatement) {
const char *SemiError = 0;
OwningStmtResult Res(Actions);
CXX0XAttributeList Attr;
if (getLang().CPlusPlus0x && isCXX0XAttributeSpecifier())
Attr = ParseCXX0XAttributes();
// Cases in this switch statement should fall through if the parser expects
// the token to end in a semicolon (in which case SemiError should be set),
// or they directly 'return;' if not.
tok::TokenKind Kind = Tok.getKind();
SourceLocation AtLoc;
switch (Kind) {
case tok::at: // May be a @try or @throw statement
{
AtLoc = ConsumeToken(); // consume @
return ParseObjCAtStatement(AtLoc);
}
case tok::code_completion:
Actions.CodeCompleteOrdinaryName(CurScope);
ConsumeToken();
return ParseStatementOrDeclaration(OnlyStatement);
case tok::identifier:
if (NextToken().is(tok::colon)) { // C99 6.8.1: labeled-statement
// identifier ':' statement
return ParseLabeledStatement(Attr.AttrList);
}
// PASS THROUGH.
default: {
if ((getLang().CPlusPlus || !OnlyStatement) && isDeclarationStatement()) {
SourceLocation DeclStart = Tok.getLocation(), DeclEnd;
DeclGroupPtrTy Decl = ParseDeclaration(Declarator::BlockContext, DeclEnd,
Attr);
return Actions.ActOnDeclStmt(Decl, DeclStart, DeclEnd);
}
if (Tok.is(tok::r_brace)) {
Diag(Tok, diag::err_expected_statement);
return StmtError();
}
// FIXME: Use the attributes
// expression[opt] ';'
OwningExprResult Expr(ParseExpression());
if (Expr.isInvalid()) {
// If the expression is invalid, skip ahead to the next semicolon. Not
// doing this opens us up to the possibility of infinite loops if
// ParseExpression does not consume any tokens.
SkipUntil(tok::semi);
return StmtError();
}
// Otherwise, eat the semicolon.
ExpectAndConsume(tok::semi, diag::err_expected_semi_after_expr);
return Actions.ActOnExprStmt(Actions.FullExpr(Expr));
}
case tok::kw_case: // C99 6.8.1: labeled-statement
return ParseCaseStatement(Attr.AttrList);
case tok::kw_default: // C99 6.8.1: labeled-statement
return ParseDefaultStatement(Attr.AttrList);
case tok::l_brace: // C99 6.8.2: compound-statement
return ParseCompoundStatement(Attr.AttrList);
case tok::semi: // C99 6.8.3p3: expression[opt] ';'
return Actions.ActOnNullStmt(ConsumeToken());
case tok::kw_if: // C99 6.8.4.1: if-statement
return ParseIfStatement(Attr.AttrList);
case tok::kw_switch: // C99 6.8.4.2: switch-statement
return ParseSwitchStatement(Attr.AttrList);
case tok::kw_while: // C99 6.8.5.1: while-statement
return ParseWhileStatement(Attr.AttrList);
case tok::kw_do: // C99 6.8.5.2: do-statement
Res = ParseDoStatement(Attr.AttrList);
SemiError = "do/while";
break;
case tok::kw_for: // C99 6.8.5.3: for-statement
return ParseForStatement(Attr.AttrList);
case tok::kw_goto: // C99 6.8.6.1: goto-statement
Res = ParseGotoStatement(Attr.AttrList);
SemiError = "goto";
break;
case tok::kw_continue: // C99 6.8.6.2: continue-statement
Res = ParseContinueStatement(Attr.AttrList);
SemiError = "continue";
break;
case tok::kw_break: // C99 6.8.6.3: break-statement
Res = ParseBreakStatement(Attr.AttrList);
SemiError = "break";
break;
case tok::kw_return: // C99 6.8.6.4: return-statement
Res = ParseReturnStatement(Attr.AttrList);
SemiError = "return";
break;
case tok::kw_asm: {
if (Attr.HasAttr)
Diag(Attr.Range.getBegin(), diag::err_attributes_not_allowed)
<< Attr.Range;
bool msAsm = false;
Res = ParseAsmStatement(msAsm);
if (msAsm) return move(Res);
SemiError = "asm";
break;
}
case tok::kw_try: // C++ 15: try-block
return ParseCXXTryBlock(Attr.AttrList);
}
// If we reached this code, the statement must end in a semicolon.
if (Tok.is(tok::semi)) {
ConsumeToken();
} else if (!Res.isInvalid()) {
// If the result was valid, then we do want to diagnose this. Use
// ExpectAndConsume to emit the diagnostic, even though we know it won't
// succeed.
ExpectAndConsume(tok::semi, diag::err_expected_semi_after_stmt, SemiError);
// Skip until we see a } or ;, but don't eat it.
SkipUntil(tok::r_brace, true, true);
}
return move(Res);
}
/// ParseLabeledStatement - We have an identifier and a ':' after it.
///
/// labeled-statement:
/// identifier ':' statement
/// [GNU] identifier ':' attributes[opt] statement
///
Parser::OwningStmtResult Parser::ParseLabeledStatement(AttributeList *Attr) {
assert(Tok.is(tok::identifier) && Tok.getIdentifierInfo() &&
"Not an identifier!");
Token IdentTok = Tok; // Save the whole token.
ConsumeToken(); // eat the identifier.
assert(Tok.is(tok::colon) && "Not a label!");
// identifier ':' statement
SourceLocation ColonLoc = ConsumeToken();
// Read label attributes, if present.
if (Tok.is(tok::kw___attribute))
Attr = addAttributeLists(Attr, ParseGNUAttributes());
OwningStmtResult SubStmt(ParseStatement());
// Broken substmt shouldn't prevent the label from being added to the AST.
if (SubStmt.isInvalid())
SubStmt = Actions.ActOnNullStmt(ColonLoc);
return Actions.ActOnLabelStmt(IdentTok.getLocation(),
IdentTok.getIdentifierInfo(),
ColonLoc, move(SubStmt));
}
/// ParseCaseStatement
/// labeled-statement:
/// 'case' constant-expression ':' statement
/// [GNU] 'case' constant-expression '...' constant-expression ':' statement
///
Parser::OwningStmtResult Parser::ParseCaseStatement(AttributeList *Attr) {
assert(Tok.is(tok::kw_case) && "Not a case stmt!");
// FIXME: Use attributes?
// It is very very common for code to contain many case statements recursively
// nested, as in (but usually without indentation):
// case 1:
// case 2:
// case 3:
// case 4:
// case 5: etc.
//
// Parsing this naively works, but is both inefficient and can cause us to run
// out of stack space in our recursive descent parser. As a special case,
// flatten this recursion into an iterative loop. This is complex and gross,
// but all the grossness is constrained to ParseCaseStatement (and some
// wierdness in the actions), so this is just local grossness :).
// TopLevelCase - This is the highest level we have parsed. 'case 1' in the
// example above.
OwningStmtResult TopLevelCase(Actions, true);
// DeepestParsedCaseStmt - This is the deepest statement we have parsed, which
// gets updated each time a new case is parsed, and whose body is unset so
// far. When parsing 'case 4', this is the 'case 3' node.
StmtTy *DeepestParsedCaseStmt = 0;
// While we have case statements, eat and stack them.
do {
SourceLocation CaseLoc = ConsumeToken(); // eat the 'case'.
if (Tok.is(tok::code_completion)) {
Actions.CodeCompleteCase(CurScope);
ConsumeToken();
}
OwningExprResult LHS(ParseConstantExpression());
if (LHS.isInvalid()) {
SkipUntil(tok::colon);
return StmtError();
}
// GNU case range extension.
SourceLocation DotDotDotLoc;
OwningExprResult RHS(Actions);
if (Tok.is(tok::ellipsis)) {
Diag(Tok, diag::ext_gnu_case_range);
DotDotDotLoc = ConsumeToken();
RHS = ParseConstantExpression();
if (RHS.isInvalid()) {
SkipUntil(tok::colon);
return StmtError();
}
}
if (Tok.isNot(tok::colon)) {
Diag(Tok, diag::err_expected_colon_after) << "'case'";
SkipUntil(tok::colon);
return StmtError();
}
SourceLocation ColonLoc = ConsumeToken();
OwningStmtResult Case =
Actions.ActOnCaseStmt(CaseLoc, move(LHS), DotDotDotLoc,
move(RHS), ColonLoc);
// If we had a sema error parsing this case, then just ignore it and
// continue parsing the sub-stmt.
if (Case.isInvalid()) {
if (TopLevelCase.isInvalid()) // No parsed case stmts.
return ParseStatement();
// Otherwise, just don't add it as a nested case.
} else {
// If this is the first case statement we parsed, it becomes TopLevelCase.
// Otherwise we link it into the current chain.
StmtTy *NextDeepest = Case.get();
if (TopLevelCase.isInvalid())
TopLevelCase = move(Case);
else
Actions.ActOnCaseStmtBody(DeepestParsedCaseStmt, move(Case));
DeepestParsedCaseStmt = NextDeepest;
}
// Handle all case statements.
} while (Tok.is(tok::kw_case));
assert(!TopLevelCase.isInvalid() && "Should have parsed at least one case!");
// If we found a non-case statement, start by parsing it.
OwningStmtResult SubStmt(Actions);
if (Tok.isNot(tok::r_brace)) {
SubStmt = ParseStatement();
} else {
// Nicely diagnose the common error "switch (X) { case 4: }", which is
// not valid.
// FIXME: add insertion hint.
Diag(Tok, diag::err_label_end_of_compound_statement);
SubStmt = true;
}
// Broken sub-stmt shouldn't prevent forming the case statement properly.
if (SubStmt.isInvalid())
SubStmt = Actions.ActOnNullStmt(SourceLocation());
// Install the body into the most deeply-nested case.
Actions.ActOnCaseStmtBody(DeepestParsedCaseStmt, move(SubStmt));
// Return the top level parsed statement tree.
return move(TopLevelCase);
}
/// ParseDefaultStatement
/// labeled-statement:
/// 'default' ':' statement
/// Note that this does not parse the 'statement' at the end.
///
Parser::OwningStmtResult Parser::ParseDefaultStatement(AttributeList *Attr) {
//FIXME: Use attributes?
assert(Tok.is(tok::kw_default) && "Not a default stmt!");
SourceLocation DefaultLoc = ConsumeToken(); // eat the 'default'.
if (Tok.isNot(tok::colon)) {
Diag(Tok, diag::err_expected_colon_after) << "'default'";
SkipUntil(tok::colon);
return StmtError();
}
SourceLocation ColonLoc = ConsumeToken();
// Diagnose the common error "switch (X) {... default: }", which is not valid.
if (Tok.is(tok::r_brace)) {
Diag(Tok, diag::err_label_end_of_compound_statement);
return StmtError();
}
OwningStmtResult SubStmt(ParseStatement());
if (SubStmt.isInvalid())
return StmtError();
return Actions.ActOnDefaultStmt(DefaultLoc, ColonLoc,
move(SubStmt), CurScope);
}
/// ParseCompoundStatement - Parse a "{}" block.
///
/// compound-statement: [C99 6.8.2]
/// { block-item-list[opt] }
/// [GNU] { label-declarations block-item-list } [TODO]
///
/// block-item-list:
/// block-item
/// block-item-list block-item
///
/// block-item:
/// declaration
/// [GNU] '__extension__' declaration
/// statement
/// [OMP] openmp-directive [TODO]
///
/// [GNU] label-declarations:
/// [GNU] label-declaration
/// [GNU] label-declarations label-declaration
///
/// [GNU] label-declaration:
/// [GNU] '__label__' identifier-list ';'
///
/// [OMP] openmp-directive: [TODO]
/// [OMP] barrier-directive
/// [OMP] flush-directive
///
Parser::OwningStmtResult Parser::ParseCompoundStatement(AttributeList *Attr,
bool isStmtExpr) {
//FIXME: Use attributes?
assert(Tok.is(tok::l_brace) && "Not a compount stmt!");
// Enter a scope to hold everything within the compound stmt. Compound
// statements can always hold declarations.
ParseScope CompoundScope(this, Scope::DeclScope);
// Parse the statements in the body.
return ParseCompoundStatementBody(isStmtExpr);
}
/// ParseCompoundStatementBody - Parse a sequence of statements and invoke the
/// ActOnCompoundStmt action. This expects the '{' to be the current token, and
/// consume the '}' at the end of the block. It does not manipulate the scope
/// stack.
Parser::OwningStmtResult Parser::ParseCompoundStatementBody(bool isStmtExpr) {
PrettyStackTraceLoc CrashInfo(PP.getSourceManager(),
Tok.getLocation(),
"in compound statement ('{}')");
SourceLocation LBraceLoc = ConsumeBrace(); // eat the '{'.
// TODO: "__label__ X, Y, Z;" is the GNU "Local Label" extension. These are
// only allowed at the start of a compound stmt regardless of the language.
typedef StmtVector StmtsTy;
StmtsTy Stmts(Actions);
while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) {
OwningStmtResult R(Actions);
if (Tok.isNot(tok::kw___extension__)) {
R = ParseStatementOrDeclaration(false);
} else {
// __extension__ can start declarations and it can also be a unary
// operator for expressions. Consume multiple __extension__ markers here
// until we can determine which is which.
// FIXME: This loses extension expressions in the AST!
SourceLocation ExtLoc = ConsumeToken();
while (Tok.is(tok::kw___extension__))
ConsumeToken();
CXX0XAttributeList Attr;
if (getLang().CPlusPlus0x && isCXX0XAttributeSpecifier())
Attr = ParseCXX0XAttributes();
// If this is the start of a declaration, parse it as such.
if (isDeclarationStatement()) {
// __extension__ silences extension warnings in the subdeclaration.
// FIXME: Save the __extension__ on the decl as a node somehow?
ExtensionRAIIObject O(Diags);
SourceLocation DeclStart = Tok.getLocation(), DeclEnd;
DeclGroupPtrTy Res = ParseDeclaration(Declarator::BlockContext, DeclEnd,
Attr);
R = Actions.ActOnDeclStmt(Res, DeclStart, DeclEnd);
} else {
// Otherwise this was a unary __extension__ marker.
OwningExprResult 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.
ExpectAndConsume(tok::semi, diag::err_expected_semi_after_expr);
R = Actions.ActOnExprStmt(Actions.FullExpr(Res));
}
}
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);
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(OwningExprResult &ExprResult,
DeclPtrTy &DeclResult) {
bool ParseError = false;
SourceLocation LParenLoc = ConsumeParen();
if (getLang().CPlusPlus)
ParseError = ParseCXXCondition(ExprResult, DeclResult);
else {
ExprResult = ParseExpression();
DeclResult = DeclPtrTy();
}
// 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.get() && 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
///
Parser::OwningStmtResult Parser::ParseIfStatement(AttributeList *Attr) {
// 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.
OwningExprResult CondExp(Actions);
DeclPtrTy CondVar;
if (ParseParenExprOrCondition(CondExp, CondVar))
return StmtError();
FullExprArg FullCondExp(Actions.FullExpr(CondExp));
// 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();
OwningStmtResult ThenStmt(ParseStatement());
// Pop the 'if' scope if needed.
InnerScope.Exit();
// If it has an else, parse it.
SourceLocation ElseLoc;
SourceLocation ElseStmtLoc;
OwningStmtResult ElseStmt(Actions);
if (Tok.is(tok::kw_else)) {
ElseLoc = ConsumeToken();
// 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));
bool WithinElse = CurScope->isWithinElse();
CurScope->setWithinElse(true);
ElseStmtLoc = Tok.getLocation();
ElseStmt = ParseStatement();
CurScope->setWithinElse(WithinElse);
// 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.get())
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, move(ThenStmt),
ElseLoc, move(ElseStmt));
}
/// ParseSwitchStatement
/// switch-statement:
/// 'switch' '(' expression ')' statement
/// [C++] 'switch' '(' condition ')' statement
Parser::OwningStmtResult Parser::ParseSwitchStatement(AttributeList *Attr) {
// 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.
OwningExprResult Cond(Actions);
DeclPtrTy CondVar;
if (ParseParenExprOrCondition(Cond, CondVar))
return StmtError();
FullExprArg FullCond(Actions.FullExpr(Cond));
OwningStmtResult Switch(Actions);
if (!Cond.isInvalid() || CondVar.get())
Switch = Actions.ActOnStartOfSwitchStmt(FullCond, CondVar);
// 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.
OwningStmtResult Body(ParseStatement());
// Pop the body scope if needed.
InnerScope.Exit();
if (Body.isInvalid()) {
Body = Actions.ActOnNullStmt(Tok.getLocation());
// FIXME: Remove the case statement list from the Switch statement.
}
SwitchScope.Exit();
if (Cond.isInvalid() && !CondVar.get())
return StmtError();
return Actions.ActOnFinishSwitchStmt(SwitchLoc, move(Switch), move(Body));
}
/// ParseWhileStatement
/// while-statement: [C99 6.8.5.1]
/// 'while' '(' expression ')' statement
/// [C++] 'while' '(' condition ')' statement
Parser::OwningStmtResult Parser::ParseWhileStatement(AttributeList *Attr) {
// 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.
OwningExprResult Cond(Actions);
DeclPtrTy CondVar;
if (ParseParenExprOrCondition(Cond, CondVar))
return StmtError();
FullExprArg FullCond(Actions.FullExpr(Cond));
// 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.
OwningStmtResult Body(ParseStatement());
// Pop the body scope if needed.
InnerScope.Exit();
WhileScope.Exit();
if ((Cond.isInvalid() && !CondVar.get()) || Body.isInvalid())
return StmtError();
return Actions.ActOnWhileStmt(WhileLoc, FullCond, CondVar, move(Body));
}
/// ParseDoStatement
/// do-statement: [C99 6.8.5.2]
/// 'do' statement 'while' '(' expression ')' ';'
/// Note: this lets the caller parse the end ';'.
Parser::OwningStmtResult Parser::ParseDoStatement(AttributeList *Attr) {
// 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.
OwningStmtResult 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();
OwningExprResult Cond = ParseExpression();
SourceLocation RPLoc = MatchRHSPunctuation(tok::r_paren, LPLoc);
DoScope.Exit();
if (Cond.isInvalid() || Body.isInvalid())
return StmtError();
return Actions.ActOnDoStmt(DoLoc, move(Body), WhileLoc, LPLoc,
move(Cond), 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
///
Parser::OwningStmtResult Parser::ParseForStatement(AttributeList *Attr) {
// 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();
OwningExprResult Value(Actions);
bool ForEach = false;
OwningStmtResult FirstPart(Actions);
OwningExprResult SecondPart(Actions), ThirdPart(Actions);
DeclPtrTy SecondVar;
if (Tok.is(tok::code_completion)) {
Actions.CodeCompleteOrdinaryName(CurScope);
ConsumeToken();
}
// 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);
AttributeList *AttrList = 0;
if (getLang().CPlusPlus0x && isCXX0XAttributeSpecifier())
AttrList = ParseCXX0XAttributes().AttrList;
SourceLocation DeclStart = Tok.getLocation(), DeclEnd;
DeclGroupPtrTy DG = ParseSimpleDeclaration(Declarator::ForContext, DeclEnd,
AttrList);
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'
SecondPart = ParseExpression();
} else {
Diag(Tok, diag::err_expected_semi_for);
SkipUntil(tok::semi);
}
} else {
Value = ParseExpression();
// Turn the expression into a stmt.
if (!Value.isInvalid())
FirstPart = Actions.ActOnExprStmt(Actions.FullExpr(Value));
if (Tok.is(tok::semi)) {
ConsumeToken();
} else if ((ForEach = isTokIdentifier_in())) {
ConsumeToken(); // consume 'in'
SecondPart = 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 {
if (getLang().CPlusPlus)
ParseCXXCondition(SecondPart, SecondVar);
else
SecondPart = ParseExpression();
}
if (Tok.is(tok::semi)) {
ConsumeToken();
} else {
if (!SecondPart.isInvalid() || SecondVar.get())
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 (...;...;)
ThirdPart = ParseExpression();
}
// 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.
OwningStmtResult 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, move(FirstPart),
Actions.FullExpr(SecondPart), SecondVar,
Actions.FullExpr(ThirdPart), RParenLoc,
move(Body));
return Actions.ActOnObjCForCollectionStmt(ForLoc, LParenLoc,
move(FirstPart),
move(SecondPart),
RParenLoc, move(Body));
}
/// ParseGotoStatement
/// jump-statement:
/// 'goto' identifier ';'
/// [GNU] 'goto' '*' expression ';'
///
/// Note: this lets the caller parse the end ';'.
///
Parser::OwningStmtResult Parser::ParseGotoStatement(AttributeList *Attr) {
// FIXME: Use attributes?
assert(Tok.is(tok::kw_goto) && "Not a goto stmt!");
SourceLocation GotoLoc = ConsumeToken(); // eat the 'goto'.
OwningStmtResult Res(Actions);
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();
OwningExprResult 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, move(R));
} else {
Diag(Tok, diag::err_expected_ident);
return StmtError();
}
return move(Res);
}
/// ParseContinueStatement
/// jump-statement:
/// 'continue' ';'
///
/// Note: this lets the caller parse the end ';'.
///
Parser::OwningStmtResult Parser::ParseContinueStatement(AttributeList *Attr) {
// FIXME: Use attributes?
SourceLocation ContinueLoc = ConsumeToken(); // eat the 'continue'.
return Actions.ActOnContinueStmt(ContinueLoc, CurScope);
}
/// ParseBreakStatement
/// jump-statement:
/// 'break' ';'
///
/// Note: this lets the caller parse the end ';'.
///
Parser::OwningStmtResult Parser::ParseBreakStatement(AttributeList *Attr) {
// FIXME: Use attributes?
SourceLocation BreakLoc = ConsumeToken(); // eat the 'break'.
return Actions.ActOnBreakStmt(BreakLoc, CurScope);
}
/// ParseReturnStatement
/// jump-statement:
/// 'return' expression[opt] ';'
Parser::OwningStmtResult Parser::ParseReturnStatement(AttributeList *Attr) {
// FIXME: Use attributes?
assert(Tok.is(tok::kw_return) && "Not a return stmt!");
SourceLocation ReturnLoc = ConsumeToken(); // eat the 'return'.
OwningExprResult R(Actions);
if (Tok.isNot(tok::semi)) {
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, move(R));
}
/// FuzzyParseMicrosoftAsmStatement. When -fms-extensions is enabled, this
/// routine is called to skip/ignore tokens that comprise the MS asm statement.
Parser::OwningStmtResult Parser::FuzzyParseMicrosoftAsmStatement() {
if (Tok.is(tok::l_brace)) {
unsigned short savedBraceCount = BraceCount;
do {
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 {
ConsumeAnyToken();
TokLoc = Tok.getLocation();
} while ((SrcMgr.getInstantiationLineNumber(TokLoc) == LineNo) &&
Tok.isNot(tok::r_brace) && Tok.isNot(tok::semi) &&
Tok.isNot(tok::eof));
}
return Actions.ActOnNullStmt(Tok.getLocation());
}
/// 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]
///
Parser::OwningStmtResult 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();
}
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;
bool isSimple = false;
if (Tok.isNot(tok::l_paren)) {
Diag(Tok, diag::err_expected_lparen_after) << "asm";
SkipUntil(tok::r_paren);
return StmtError();
}
Loc = ConsumeParen();
OwningExprResult AsmString(ParseAsmStringLiteral());
if (AsmString.isInvalid())
return StmtError();
llvm::SmallVector<std::string, 4> Names;
ExprVector Constraints(Actions);
ExprVector Exprs(Actions);
ExprVector Clobbers(Actions);
unsigned NumInputs = 0, NumOutputs = 0;
SourceLocation RParenLoc;
if (Tok.is(tok::r_paren)) {
// We have a simple asm expression
isSimple = true;
RParenLoc = ConsumeParen();
} else {
// Parse Outputs, if present.
if (ParseAsmOperandsOpt(Names, Constraints, Exprs))
return StmtError();
NumOutputs = Names.size();
// Parse Inputs, if present.
if (ParseAsmOperandsOpt(Names, Constraints, Exprs))
return StmtError();
assert(Names.size() == Constraints.size() &&
Constraints.size() == Exprs.size()
&& "Input operand size mismatch!");
NumInputs = Names.size() - NumOutputs;
// Parse the clobbers, if present.
if (Tok.is(tok::colon)) {
ConsumeToken();
// Parse the asm-string list for clobbers.
while (1) {
OwningExprResult Clobber(ParseAsmStringLiteral());
if (Clobber.isInvalid())
break;
Clobbers.push_back(Clobber.release());
if (Tok.isNot(tok::comma)) break;
ConsumeToken();
}
}
RParenLoc = MatchRHSPunctuation(tok::r_paren, Loc);
}
return Actions.ActOnAsmStmt(AsmLoc, isSimple, isVolatile,
NumOutputs, NumInputs, Names.data(),
move_arg(Constraints), move_arg(Exprs),
move(AsmString), move_arg(Clobbers),
RParenLoc);
}
/// ParseAsmOperands - Parse the asm-operands production as used by
/// asm-statement. We also parse a leading ':' token. If the leading colon is
/// not present, we do not parse anything.
///
/// [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<std::string> &Names,
llvm::SmallVectorImpl<ExprTy*> &Constraints,
llvm::SmallVectorImpl<ExprTy*> &Exprs) {
// Only do anything if this operand is present.
if (Tok.isNot(tok::colon)) return false;
ConsumeToken();
// '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->getName());
MatchRHSPunctuation(tok::r_square, Loc);
} else
Names.push_back(std::string());
OwningExprResult 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();
OwningExprResult 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;
}
Parser::DeclPtrTy Parser::ParseFunctionStatementBody(DeclPtrTy Decl) {
assert(Tok.is(tok::l_brace));
SourceLocation LBraceLoc = Tok.getLocation();
PrettyStackTraceActionsDecl CrashInfo(Decl, LBraceLoc, Actions,
PP.getSourceManager(),
"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.
OwningStmtResult 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, move(FnBody));
}
/// ParseFunctionTryBlock - Parse a C++ function-try-block.
///
/// function-try-block:
/// 'try' ctor-initializer[opt] compound-statement handler-seq
///
Parser::DeclPtrTy Parser::ParseFunctionTryBlock(DeclPtrTy Decl) {
assert(Tok.is(tok::kw_try) && "Expected 'try'");
SourceLocation TryLoc = ConsumeToken();
PrettyStackTraceActionsDecl CrashInfo(Decl, TryLoc, Actions,
PP.getSourceManager(),
"parsing function try block");
// Constructor initializer list?
if (Tok.is(tok::colon))
ParseConstructorInitializer(Decl);
SourceLocation LBraceLoc = Tok.getLocation();
OwningStmtResult 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, move(FnBody));
}
/// ParseCXXTryBlock - Parse a C++ try-block.
///
/// try-block:
/// 'try' compound-statement handler-seq
///
Parser::OwningStmtResult Parser::ParseCXXTryBlock(AttributeList* Attr) {
// 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]
///
Parser::OwningStmtResult 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?
OwningStmtResult TryBlock(ParseCompoundStatement(0));
if (TryBlock.isInvalid())
return move(TryBlock);
StmtVector Handlers(Actions);
if (getLang().CPlusPlus0x && isCXX0XAttributeSpecifier()) {
CXX0XAttributeList Attr = ParseCXX0XAttributes();
Diag(Attr.Range.getBegin(), diag::err_attributes_not_allowed)
<< Attr.Range;
}
if (Tok.isNot(tok::kw_catch))
return StmtError(Diag(Tok, diag::err_expected_catch));
while (Tok.is(tok::kw_catch)) {
OwningStmtResult 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, move(TryBlock), 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
/// '...'
///
Parser::OwningStmtResult 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.
DeclPtrTy ExceptionDecl;
if (Tok.isNot(tok::ellipsis)) {
DeclSpec DS;
if (ParseCXXTypeSpecifierSeq(DS))
return StmtError();
Declarator ExDecl(DS, Declarator::CXXCatchContext);
ParseDeclarator(ExDecl);
ExceptionDecl = Actions.ActOnExceptionDeclarator(CurScope, 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?
OwningStmtResult Block(ParseCompoundStatement(0));
if (Block.isInvalid())
return move(Block);
return Actions.ActOnCXXCatchBlock(CatchLoc, ExceptionDecl, move(Block));
}
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