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//===--- Designator.h - Initialization Designator ---------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file defines interfaces used to represent designators (a la
// C99 designated initializers) during parsing.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CLANG_SEMA_DESIGNATOR_H
#define LLVM_CLANG_SEMA_DESIGNATOR_H
#include "clang/Basic/SourceLocation.h"
#include "llvm/ADT/SmallVector.h"
namespace clang {
class Expr;
class IdentifierInfo;
class Sema;
/// Designator - A designator in a C99 designated initializer.
///
/// This class is a discriminated union which holds the various
/// different sorts of designators possible. A Designation is an array of
/// these. An example of a designator are things like this:
/// [8] .field [47] // C99 designation: 3 designators
/// [8 ... 47] field: // GNU extensions: 2 designators
/// These occur in initializers, e.g.:
/// int a[10] = {2, 4, [8]=9, 10};
///
class Designator {
public:
enum DesignatorKind {
FieldDesignator, ArrayDesignator, ArrayRangeDesignator
};
private:
DesignatorKind Kind;
struct FieldDesignatorInfo {
const IdentifierInfo *II;
unsigned DotLoc;
unsigned NameLoc;
};
struct ArrayDesignatorInfo {
Expr *Index;
unsigned LBracketLoc;
mutable unsigned RBracketLoc;
};
struct ArrayRangeDesignatorInfo {
Expr *Start, *End;
unsigned LBracketLoc, EllipsisLoc;
mutable unsigned RBracketLoc;
};
union {
FieldDesignatorInfo FieldInfo;
ArrayDesignatorInfo ArrayInfo;
ArrayRangeDesignatorInfo ArrayRangeInfo;
};
public:
DesignatorKind getKind() const { return Kind; }
bool isFieldDesignator() const { return Kind == FieldDesignator; }
bool isArrayDesignator() const { return Kind == ArrayDesignator; }
bool isArrayRangeDesignator() const { return Kind == ArrayRangeDesignator; }
const IdentifierInfo *getField() const {
assert(isFieldDesignator() && "Invalid accessor");
return FieldInfo.II;
}
SourceLocation getDotLoc() const {
assert(isFieldDesignator() && "Invalid accessor");
return SourceLocation::getFromRawEncoding(FieldInfo.DotLoc);
}
SourceLocation getFieldLoc() const {
assert(isFieldDesignator() && "Invalid accessor");
return SourceLocation::getFromRawEncoding(FieldInfo.NameLoc);
}
Expr *getArrayIndex() const {
assert(isArrayDesignator() && "Invalid accessor");
return ArrayInfo.Index;
}
Expr *getArrayRangeStart() const {
assert(isArrayRangeDesignator() && "Invalid accessor");
return ArrayRangeInfo.Start;
}
Expr *getArrayRangeEnd() const {
assert(isArrayRangeDesignator() && "Invalid accessor");
return ArrayRangeInfo.End;
}
SourceLocation getLBracketLoc() const {
assert((isArrayDesignator() || isArrayRangeDesignator()) &&
"Invalid accessor");
if (isArrayDesignator())
return SourceLocation::getFromRawEncoding(ArrayInfo.LBracketLoc);
else
return SourceLocation::getFromRawEncoding(ArrayRangeInfo.LBracketLoc);
}
SourceLocation getRBracketLoc() const {
assert((isArrayDesignator() || isArrayRangeDesignator()) &&
"Invalid accessor");
if (isArrayDesignator())
return SourceLocation::getFromRawEncoding(ArrayInfo.RBracketLoc);
else
return SourceLocation::getFromRawEncoding(ArrayRangeInfo.RBracketLoc);
}
SourceLocation getEllipsisLoc() const {
assert(isArrayRangeDesignator() && "Invalid accessor");
return SourceLocation::getFromRawEncoding(ArrayRangeInfo.EllipsisLoc);
}
static Designator getField(const IdentifierInfo *II, SourceLocation DotLoc,
SourceLocation NameLoc) {
Designator D;
D.Kind = FieldDesignator;
D.FieldInfo.II = II;
D.FieldInfo.DotLoc = DotLoc.getRawEncoding();
D.FieldInfo.NameLoc = NameLoc.getRawEncoding();
return D;
}
static Designator getArray(Expr *Index,
SourceLocation LBracketLoc) {
Designator D;
D.Kind = ArrayDesignator;
D.ArrayInfo.Index = Index;
D.ArrayInfo.LBracketLoc = LBracketLoc.getRawEncoding();
D.ArrayInfo.RBracketLoc = 0;
return D;
}
static Designator getArrayRange(Expr *Start,
Expr *End,
SourceLocation LBracketLoc,
SourceLocation EllipsisLoc) {
Designator D;
D.Kind = ArrayRangeDesignator;
D.ArrayRangeInfo.Start = Start;
D.ArrayRangeInfo.End = End;
D.ArrayRangeInfo.LBracketLoc = LBracketLoc.getRawEncoding();
D.ArrayRangeInfo.EllipsisLoc = EllipsisLoc.getRawEncoding();
D.ArrayRangeInfo.RBracketLoc = 0;
return D;
}
void setRBracketLoc(SourceLocation RBracketLoc) const {
assert((isArrayDesignator() || isArrayRangeDesignator()) &&
"Invalid accessor");
if (isArrayDesignator())
ArrayInfo.RBracketLoc = RBracketLoc.getRawEncoding();
else
ArrayRangeInfo.RBracketLoc = RBracketLoc.getRawEncoding();
}
/// ClearExprs - Null out any expression references, which prevents
/// them from being 'delete'd later.
void ClearExprs(Sema &Actions) {}
/// FreeExprs - Release any unclaimed memory for the expressions in
/// this designator.
void FreeExprs(Sema &Actions) {}
};
/// Designation - Represent a full designation, which is a sequence of
/// designators. This class is mostly a helper for InitListDesignations.
class Designation {
/// Designators - The actual designators for this initializer.
SmallVector<Designator, 2> Designators;
public:
/// AddDesignator - Add a designator to the end of this list.
void AddDesignator(Designator D) {
Designators.push_back(D);
}
bool empty() const { return Designators.empty(); }
unsigned getNumDesignators() const { return Designators.size(); }
const Designator &getDesignator(unsigned Idx) const {
assert(Idx < Designators.size());
return Designators[Idx];
}
/// ClearExprs - Null out any expression references, which prevents them from
/// being 'delete'd later.
void ClearExprs(Sema &Actions) {}
/// FreeExprs - Release any unclaimed memory for the expressions in this
/// designation.
void FreeExprs(Sema &Actions) {}
};
} // end namespace clang
#endif
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