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//===--- ParseInit.cpp - Initializer Parsing ------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements initializer parsing as specified by C99 6.7.8.
//
//===----------------------------------------------------------------------===//
#include "clang/Parse/Designator.h"
#include "clang/Parse/Parser.h"
#include "clang/Parse/ParseDiagnostic.h"
#include "llvm/ADT/SmallString.h"
using namespace clang;
/// MayBeDesignationStart - Return true if this token might be the start of a
/// designator. If we can tell it is impossible that it is a designator, return
/// false.
static bool MayBeDesignationStart(tok::TokenKind K, Preprocessor &PP) {
switch (K) {
default: return false;
case tok::period: // designator: '.' identifier
case tok::l_square: // designator: array-designator
return true;
case tok::identifier: // designation: identifier ':'
return PP.LookAhead(0).is(tok::colon);
}
}
/// ParseInitializerWithPotentialDesignator - Parse the 'initializer' production
/// checking to see if the token stream starts with a designator.
///
/// designation:
/// designator-list '='
/// [GNU] array-designator
/// [GNU] identifier ':'
///
/// designator-list:
/// designator
/// designator-list designator
///
/// designator:
/// array-designator
/// '.' identifier
///
/// array-designator:
/// '[' constant-expression ']'
/// [GNU] '[' constant-expression '...' constant-expression ']'
///
/// NOTE: [OBC] allows '[ objc-receiver objc-message-args ]' as an
/// initializer (because it is an expression). We need to consider this case
/// when parsing array designators.
///
Parser::OwningExprResult Parser::ParseInitializerWithPotentialDesignator() {
// If this is the old-style GNU extension:
// designation ::= identifier ':'
// Handle it as a field designator. Otherwise, this must be the start of a
// normal expression.
if (Tok.is(tok::identifier)) {
const IdentifierInfo *FieldName = Tok.getIdentifierInfo();
std::string NewSyntax(".");
NewSyntax += FieldName->getName();
NewSyntax += " = ";
SourceLocation NameLoc = ConsumeToken(); // Eat the identifier.
assert(Tok.is(tok::colon) && "MayBeDesignationStart not working properly!");
SourceLocation ColonLoc = ConsumeToken();
Diag(Tok, diag::ext_gnu_old_style_field_designator)
<< CodeModificationHint::CreateReplacement(SourceRange(NameLoc,
ColonLoc),
NewSyntax);
Designation D;
D.AddDesignator(Designator::getField(FieldName, SourceLocation(), NameLoc));
return Actions.ActOnDesignatedInitializer(D, ColonLoc, true,
ParseInitializer());
}
// Desig - This is initialized when we see our first designator. We may have
// an objc message send with no designator, so we don't want to create this
// eagerly.
Designation Desig;
// Parse each designator in the designator list until we find an initializer.
while (Tok.is(tok::period) || Tok.is(tok::l_square)) {
if (Tok.is(tok::period)) {
// designator: '.' identifier
SourceLocation DotLoc = ConsumeToken();
if (Tok.isNot(tok::identifier)) {
Diag(Tok.getLocation(), diag::err_expected_field_designator);
return ExprError();
}
Desig.AddDesignator(Designator::getField(Tok.getIdentifierInfo(), DotLoc,
Tok.getLocation()));
ConsumeToken(); // Eat the identifier.
continue;
}
// We must have either an array designator now or an objc message send.
assert(Tok.is(tok::l_square) && "Unexpected token!");
// Handle the two forms of array designator:
// array-designator: '[' constant-expression ']'
// array-designator: '[' constant-expression '...' constant-expression ']'
//
// Also, we have to handle the case where the expression after the
// designator an an objc message send: '[' objc-message-expr ']'.
// Interesting cases are:
// [foo bar] -> objc message send
// [foo] -> array designator
// [foo ... bar] -> array designator
// [4][foo bar] -> obsolete GNU designation with objc message send.
//
SourceLocation StartLoc = ConsumeBracket();
// If Objective-C is enabled and this is a typename or other identifier
// receiver, parse this as a message send expression.
if (getLang().ObjC1 && isTokObjCMessageIdentifierReceiver()) {
// If we have exactly one array designator, this used the GNU
// 'designation: array-designator' extension, otherwise there should be no
// designators at all!
if (Desig.getNumDesignators() == 1 &&
(Desig.getDesignator(0).isArrayDesignator() ||
Desig.getDesignator(0).isArrayRangeDesignator()))
Diag(StartLoc, diag::ext_gnu_missing_equal_designator);
else if (Desig.getNumDesignators() > 0)
Diag(Tok, diag::err_expected_equal_designator);
IdentifierInfo *Name = Tok.getIdentifierInfo();
SourceLocation NameLoc = ConsumeToken();
return ParseAssignmentExprWithObjCMessageExprStart(
StartLoc, NameLoc, Name, ExprArg(Actions));
}
// Note that we parse this as an assignment expression, not a constant
// expression (allowing *=, =, etc) to handle the objc case. Sema needs
// to validate that the expression is a constant.
OwningExprResult Idx(ParseAssignmentExpression());
if (Idx.isInvalid()) {
SkipUntil(tok::r_square);
return move(Idx);
}
// Given an expression, we could either have a designator (if the next
// tokens are '...' or ']' or an objc message send. If this is an objc
// message send, handle it now. An objc-message send is the start of
// an assignment-expression production.
if (getLang().ObjC1 && Tok.isNot(tok::ellipsis) &&
Tok.isNot(tok::r_square)) {
// If we have exactly one array designator, this used the GNU
// 'designation: array-designator' extension, otherwise there should be no
// designators at all!
if (Desig.getNumDesignators() == 1 &&
(Desig.getDesignator(0).isArrayDesignator() ||
Desig.getDesignator(0).isArrayRangeDesignator()))
Diag(StartLoc, diag::ext_gnu_missing_equal_designator);
else if (Desig.getNumDesignators() > 0)
Diag(Tok, diag::err_expected_equal_designator);
return ParseAssignmentExprWithObjCMessageExprStart(StartLoc,
SourceLocation(),
0, move(Idx));
}
// If this is a normal array designator, remember it.
if (Tok.isNot(tok::ellipsis)) {
Desig.AddDesignator(Designator::getArray(Idx.release(), StartLoc));
} else {
// Handle the gnu array range extension.
Diag(Tok, diag::ext_gnu_array_range);
SourceLocation EllipsisLoc = ConsumeToken();
OwningExprResult RHS(ParseConstantExpression());
if (RHS.isInvalid()) {
SkipUntil(tok::r_square);
return move(RHS);
}
Desig.AddDesignator(Designator::getArrayRange(Idx.release(),
RHS.release(),
StartLoc, EllipsisLoc));
}
SourceLocation EndLoc = MatchRHSPunctuation(tok::r_square, StartLoc);
Desig.getDesignator(Desig.getNumDesignators() - 1).setRBracketLoc(EndLoc);
}
// Okay, we're done with the designator sequence. We know that there must be
// at least one designator, because the only case we can get into this method
// without a designator is when we have an objc message send. That case is
// handled and returned from above.
assert(!Desig.empty() && "Designator is empty?");
// Handle a normal designator sequence end, which is an equal.
if (Tok.is(tok::equal)) {
SourceLocation EqualLoc = ConsumeToken();
return Actions.ActOnDesignatedInitializer(Desig, EqualLoc, false,
ParseInitializer());
}
// We read some number of designators and found something that isn't an = or
// an initializer. If we have exactly one array designator, this
// is the GNU 'designation: array-designator' extension. Otherwise, it is a
// parse error.
if (Desig.getNumDesignators() == 1 &&
(Desig.getDesignator(0).isArrayDesignator() ||
Desig.getDesignator(0).isArrayRangeDesignator())) {
Diag(Tok, diag::ext_gnu_missing_equal_designator)
<< CodeModificationHint::CreateInsertion(Tok.getLocation(), "= ");
return Actions.ActOnDesignatedInitializer(Desig, Tok.getLocation(),
true, ParseInitializer());
}
Diag(Tok, diag::err_expected_equal_designator);
return ExprError();
}
/// ParseBraceInitializer - Called when parsing an initializer that has a
/// leading open brace.
///
/// initializer: [C99 6.7.8]
/// '{' initializer-list '}'
/// '{' initializer-list ',' '}'
/// [GNU] '{' '}'
///
/// initializer-list:
/// designation[opt] initializer
/// initializer-list ',' designation[opt] initializer
///
Parser::OwningExprResult Parser::ParseBraceInitializer() {
SourceLocation LBraceLoc = ConsumeBrace();
/// InitExprs - This is the actual list of expressions contained in the
/// initializer.
ExprVector InitExprs(Actions);
if (Tok.is(tok::r_brace)) {
// Empty initializers are a C++ feature and a GNU extension to C.
if (!getLang().CPlusPlus)
Diag(LBraceLoc, diag::ext_gnu_empty_initializer);
// Match the '}'.
return Actions.ActOnInitList(LBraceLoc, Action::MultiExprArg(Actions),
ConsumeBrace());
}
bool InitExprsOk = true;
while (1) {
// Parse: designation[opt] initializer
// If we know that this cannot be a designation, just parse the nested
// initializer directly.
OwningExprResult SubElt(Actions);
if (MayBeDesignationStart(Tok.getKind(), PP))
SubElt = ParseInitializerWithPotentialDesignator();
else
SubElt = ParseInitializer();
// If we couldn't parse the subelement, bail out.
if (!SubElt.isInvalid()) {
InitExprs.push_back(SubElt.release());
} else {
InitExprsOk = false;
// We have two ways to try to recover from this error: if the code looks
// gramatically ok (i.e. we have a comma coming up) try to continue
// parsing the rest of the initializer. This allows us to emit
// diagnostics for later elements that we find. If we don't see a comma,
// assume there is a parse error, and just skip to recover.
// FIXME: This comment doesn't sound right. If there is a r_brace
// immediately, it can't be an error, since there is no other way of
// leaving this loop except through this if.
if (Tok.isNot(tok::comma)) {
SkipUntil(tok::r_brace, false, true);
break;
}
}
// If we don't have a comma continued list, we're done.
if (Tok.isNot(tok::comma)) break;
// TODO: save comma locations if some client cares.
ConsumeToken();
// Handle trailing comma.
if (Tok.is(tok::r_brace)) break;
}
if (InitExprsOk && Tok.is(tok::r_brace))
return Actions.ActOnInitList(LBraceLoc, move_arg(InitExprs),
ConsumeBrace());
// Match the '}'.
MatchRHSPunctuation(tok::r_brace, LBraceLoc);
return ExprError(); // an error occurred.
}