forked from OSchip/llvm-project
1688 lines
68 KiB
C++
1688 lines
68 KiB
C++
//===--- SemaInit.cpp - Semantic Analysis for Initializers ----------------===//
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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 semantic analysis for initializers. The main entry
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// point is Sema::CheckInitList(), but all of the work is performed
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// within the InitListChecker class.
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//
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// This file also implements Sema::CheckInitializerTypes.
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//
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//===----------------------------------------------------------------------===//
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#include "Sema.h"
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#include "clang/Parse/Designator.h"
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#include "clang/AST/ASTContext.h"
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#include "clang/AST/ExprObjC.h"
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#include <map>
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using namespace clang;
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//===----------------------------------------------------------------------===//
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// Sema Initialization Checking
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//===----------------------------------------------------------------------===//
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static Expr *IsStringInit(Expr *Init, QualType DeclType, ASTContext &Context) {
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const ArrayType *AT = Context.getAsArrayType(DeclType);
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if (!AT) return 0;
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// See if this is a string literal or @encode.
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Init = Init->IgnoreParens();
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// Handle @encode, which is a narrow string.
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if (isa<ObjCEncodeExpr>(Init) && AT->getElementType()->isCharType())
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return Init;
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// Otherwise we can only handle string literals.
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StringLiteral *SL = dyn_cast<StringLiteral>(Init);
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if (SL == 0) return 0;
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// char array can be initialized with a narrow string.
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// Only allow char x[] = "foo"; not char x[] = L"foo";
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if (!SL->isWide())
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return AT->getElementType()->isCharType() ? Init : 0;
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// wchar_t array can be initialized with a wide string: C99 6.7.8p15:
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// "An array with element type compatible with wchar_t may be initialized by a
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// wide string literal, optionally enclosed in braces."
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if (Context.typesAreCompatible(Context.getWCharType(), AT->getElementType()))
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// Only allow wchar_t x[] = L"foo"; not wchar_t x[] = "foo";
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return Init;
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return 0;
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}
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static bool CheckSingleInitializer(Expr *&Init, QualType DeclType,
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bool DirectInit, Sema &S) {
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// Get the type before calling CheckSingleAssignmentConstraints(), since
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// it can promote the expression.
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QualType InitType = Init->getType();
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if (S.getLangOptions().CPlusPlus) {
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// FIXME: I dislike this error message. A lot.
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if (S.PerformImplicitConversion(Init, DeclType, "initializing", DirectInit))
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return S.Diag(Init->getSourceRange().getBegin(),
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diag::err_typecheck_convert_incompatible)
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<< DeclType << Init->getType() << "initializing"
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<< Init->getSourceRange();
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return false;
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}
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Sema::AssignConvertType ConvTy =
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S.CheckSingleAssignmentConstraints(DeclType, Init);
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return S.DiagnoseAssignmentResult(ConvTy, Init->getLocStart(), DeclType,
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InitType, Init, "initializing");
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}
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static void CheckStringInit(Expr *Str, QualType &DeclT, Sema &S) {
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// Get the length of the string as parsed.
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uint64_t StrLength =
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cast<ConstantArrayType>(Str->getType())->getSize().getZExtValue();
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const ArrayType *AT = S.Context.getAsArrayType(DeclT);
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if (const IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(AT)) {
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// C99 6.7.8p14. We have an array of character type with unknown size
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// being initialized to a string literal.
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llvm::APSInt ConstVal(32);
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ConstVal = StrLength;
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// Return a new array type (C99 6.7.8p22).
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DeclT = S.Context.getConstantArrayType(IAT->getElementType(), ConstVal,
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ArrayType::Normal, 0);
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return;
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}
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const ConstantArrayType *CAT = cast<ConstantArrayType>(AT);
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// C99 6.7.8p14. We have an array of character type with known size. However,
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// the size may be smaller or larger than the string we are initializing.
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// FIXME: Avoid truncation for 64-bit length strings.
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if (StrLength-1 > CAT->getSize().getZExtValue())
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S.Diag(Str->getSourceRange().getBegin(),
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diag::warn_initializer_string_for_char_array_too_long)
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<< Str->getSourceRange();
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// Set the type to the actual size that we are initializing. If we have
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// something like:
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// char x[1] = "foo";
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// then this will set the string literal's type to char[1].
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Str->setType(DeclT);
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}
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bool Sema::CheckInitializerTypes(Expr *&Init, QualType &DeclType,
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SourceLocation InitLoc,
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DeclarationName InitEntity,
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bool DirectInit) {
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if (DeclType->isDependentType() || Init->isTypeDependent())
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return false;
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// C++ [dcl.init.ref]p1:
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// A variable declared to be a T& or T&&, that is "reference to type T"
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// (8.3.2), shall be initialized by an object, or function, of
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// type T or by an object that can be converted into a T.
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if (DeclType->isReferenceType())
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return CheckReferenceInit(Init, DeclType, 0, false, DirectInit);
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// C99 6.7.8p3: The type of the entity to be initialized shall be an array
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// of unknown size ("[]") or an object type that is not a variable array type.
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if (const VariableArrayType *VAT = Context.getAsVariableArrayType(DeclType))
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return Diag(InitLoc, diag::err_variable_object_no_init)
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<< VAT->getSizeExpr()->getSourceRange();
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InitListExpr *InitList = dyn_cast<InitListExpr>(Init);
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if (!InitList) {
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// FIXME: Handle wide strings
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if (Expr *Str = IsStringInit(Init, DeclType, Context)) {
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CheckStringInit(Str, DeclType, *this);
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return false;
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}
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// C++ [dcl.init]p14:
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// -- If the destination type is a (possibly cv-qualified) class
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// type:
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if (getLangOptions().CPlusPlus && DeclType->isRecordType()) {
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QualType DeclTypeC = Context.getCanonicalType(DeclType);
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QualType InitTypeC = Context.getCanonicalType(Init->getType());
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// -- If the initialization is direct-initialization, or if it is
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// copy-initialization where the cv-unqualified version of the
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// source type is the same class as, or a derived class of, the
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// class of the destination, constructors are considered.
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if ((DeclTypeC.getUnqualifiedType() == InitTypeC.getUnqualifiedType()) ||
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IsDerivedFrom(InitTypeC, DeclTypeC)) {
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CXXConstructorDecl *Constructor
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= PerformInitializationByConstructor(DeclType, &Init, 1,
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InitLoc, Init->getSourceRange(),
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InitEntity,
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DirectInit? IK_Direct : IK_Copy);
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return Constructor == 0;
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}
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// -- Otherwise (i.e., for the remaining copy-initialization
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// cases), user-defined conversion sequences that can
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// convert from the source type to the destination type or
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// (when a conversion function is used) to a derived class
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// thereof are enumerated as described in 13.3.1.4, and the
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// best one is chosen through overload resolution
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// (13.3). If the conversion cannot be done or is
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// ambiguous, the initialization is ill-formed. The
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// function selected is called with the initializer
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// expression as its argument; if the function is a
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// constructor, the call initializes a temporary of the
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// destination type.
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// FIXME: We're pretending to do copy elision here; return to
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// this when we have ASTs for such things.
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if (!PerformImplicitConversion(Init, DeclType, "initializing"))
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return false;
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if (InitEntity)
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return Diag(InitLoc, diag::err_cannot_initialize_decl)
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<< InitEntity << (int)(Init->isLvalue(Context) == Expr::LV_Valid)
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<< Init->getType() << Init->getSourceRange();
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else
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return Diag(InitLoc, diag::err_cannot_initialize_decl_noname)
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<< DeclType << (int)(Init->isLvalue(Context) == Expr::LV_Valid)
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<< Init->getType() << Init->getSourceRange();
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}
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// C99 6.7.8p16.
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if (DeclType->isArrayType())
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return Diag(Init->getLocStart(), diag::err_array_init_list_required)
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<< Init->getSourceRange();
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return CheckSingleInitializer(Init, DeclType, DirectInit, *this);
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}
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bool hadError = CheckInitList(InitList, DeclType);
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Init = InitList;
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return hadError;
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}
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//===----------------------------------------------------------------------===//
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// Semantic checking for initializer lists.
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//===----------------------------------------------------------------------===//
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/// @brief Semantic checking for initializer lists.
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///
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/// The InitListChecker class contains a set of routines that each
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/// handle the initialization of a certain kind of entity, e.g.,
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/// arrays, vectors, struct/union types, scalars, etc. The
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/// InitListChecker itself performs a recursive walk of the subobject
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/// structure of the type to be initialized, while stepping through
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/// the initializer list one element at a time. The IList and Index
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/// parameters to each of the Check* routines contain the active
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/// (syntactic) initializer list and the index into that initializer
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/// list that represents the current initializer. Each routine is
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/// responsible for moving that Index forward as it consumes elements.
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///
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/// Each Check* routine also has a StructuredList/StructuredIndex
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/// arguments, which contains the current the "structured" (semantic)
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/// initializer list and the index into that initializer list where we
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/// are copying initializers as we map them over to the semantic
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/// list. Once we have completed our recursive walk of the subobject
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/// structure, we will have constructed a full semantic initializer
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/// list.
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///
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/// C99 designators cause changes in the initializer list traversal,
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/// because they make the initialization "jump" into a specific
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/// subobject and then continue the initialization from that
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/// point. CheckDesignatedInitializer() recursively steps into the
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/// designated subobject and manages backing out the recursion to
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/// initialize the subobjects after the one designated.
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namespace {
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class InitListChecker {
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Sema &SemaRef;
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bool hadError;
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std::map<InitListExpr *, InitListExpr *> SyntacticToSemantic;
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InitListExpr *FullyStructuredList;
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void CheckImplicitInitList(InitListExpr *ParentIList, QualType T,
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unsigned &Index, InitListExpr *StructuredList,
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unsigned &StructuredIndex,
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bool TopLevelObject = false);
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void CheckExplicitInitList(InitListExpr *IList, QualType &T,
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unsigned &Index, InitListExpr *StructuredList,
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unsigned &StructuredIndex,
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bool TopLevelObject = false);
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void CheckListElementTypes(InitListExpr *IList, QualType &DeclType,
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bool SubobjectIsDesignatorContext,
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unsigned &Index,
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InitListExpr *StructuredList,
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unsigned &StructuredIndex,
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bool TopLevelObject = false);
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void CheckSubElementType(InitListExpr *IList, QualType ElemType,
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unsigned &Index,
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InitListExpr *StructuredList,
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unsigned &StructuredIndex);
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void CheckScalarType(InitListExpr *IList, QualType DeclType,
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unsigned &Index,
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InitListExpr *StructuredList,
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unsigned &StructuredIndex);
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void CheckReferenceType(InitListExpr *IList, QualType DeclType,
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unsigned &Index,
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InitListExpr *StructuredList,
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unsigned &StructuredIndex);
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void CheckVectorType(InitListExpr *IList, QualType DeclType, unsigned &Index,
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InitListExpr *StructuredList,
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unsigned &StructuredIndex);
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void CheckStructUnionTypes(InitListExpr *IList, QualType DeclType,
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RecordDecl::field_iterator Field,
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bool SubobjectIsDesignatorContext, unsigned &Index,
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InitListExpr *StructuredList,
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unsigned &StructuredIndex,
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bool TopLevelObject = false);
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void CheckArrayType(InitListExpr *IList, QualType &DeclType,
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llvm::APSInt elementIndex,
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bool SubobjectIsDesignatorContext, unsigned &Index,
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InitListExpr *StructuredList,
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unsigned &StructuredIndex);
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bool CheckDesignatedInitializer(InitListExpr *IList, DesignatedInitExpr *DIE,
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DesignatedInitExpr::designators_iterator D,
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QualType &CurrentObjectType,
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RecordDecl::field_iterator *NextField,
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llvm::APSInt *NextElementIndex,
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unsigned &Index,
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InitListExpr *StructuredList,
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unsigned &StructuredIndex,
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bool FinishSubobjectInit,
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bool TopLevelObject);
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InitListExpr *getStructuredSubobjectInit(InitListExpr *IList, unsigned Index,
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QualType CurrentObjectType,
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InitListExpr *StructuredList,
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unsigned StructuredIndex,
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SourceRange InitRange);
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void UpdateStructuredListElement(InitListExpr *StructuredList,
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unsigned &StructuredIndex,
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Expr *expr);
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int numArrayElements(QualType DeclType);
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int numStructUnionElements(QualType DeclType);
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void FillInValueInitializations(InitListExpr *ILE);
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public:
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InitListChecker(Sema &S, InitListExpr *IL, QualType &T);
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bool HadError() { return hadError; }
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// @brief Retrieves the fully-structured initializer list used for
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// semantic analysis and code generation.
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InitListExpr *getFullyStructuredList() const { return FullyStructuredList; }
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};
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} // end anonymous namespace
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/// Recursively replaces NULL values within the given initializer list
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/// with expressions that perform value-initialization of the
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/// appropriate type.
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void InitListChecker::FillInValueInitializations(InitListExpr *ILE) {
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assert((ILE->getType() != SemaRef.Context.VoidTy) &&
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"Should not have void type");
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SourceLocation Loc = ILE->getSourceRange().getBegin();
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if (ILE->getSyntacticForm())
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Loc = ILE->getSyntacticForm()->getSourceRange().getBegin();
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if (const RecordType *RType = ILE->getType()->getAsRecordType()) {
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unsigned Init = 0, NumInits = ILE->getNumInits();
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for (RecordDecl::field_iterator Field = RType->getDecl()->field_begin(),
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FieldEnd = RType->getDecl()->field_end();
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Field != FieldEnd; ++Field) {
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if (Field->isUnnamedBitfield())
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continue;
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if (Init >= NumInits || !ILE->getInit(Init)) {
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if (Field->getType()->isReferenceType()) {
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// C++ [dcl.init.aggr]p9:
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// If an incomplete or empty initializer-list leaves a
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// member of reference type uninitialized, the program is
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// ill-formed.
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SemaRef.Diag(Loc, diag::err_init_reference_member_uninitialized)
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<< Field->getType()
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<< ILE->getSyntacticForm()->getSourceRange();
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SemaRef.Diag(Field->getLocation(),
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diag::note_uninit_reference_member);
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hadError = true;
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return;
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} else if (SemaRef.CheckValueInitialization(Field->getType(), Loc)) {
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hadError = true;
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return;
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}
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// FIXME: If value-initialization involves calling a
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// constructor, should we make that call explicit in the
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// representation (even when it means extending the
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// initializer list)?
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if (Init < NumInits && !hadError)
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ILE->setInit(Init,
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new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()));
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} else if (InitListExpr *InnerILE
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= dyn_cast<InitListExpr>(ILE->getInit(Init)))
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FillInValueInitializations(InnerILE);
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++Init;
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// Only look at the first initialization of a union.
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if (RType->getDecl()->isUnion())
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break;
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}
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return;
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}
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QualType ElementType;
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unsigned NumInits = ILE->getNumInits();
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unsigned NumElements = NumInits;
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if (const ArrayType *AType = SemaRef.Context.getAsArrayType(ILE->getType())) {
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ElementType = AType->getElementType();
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if (const ConstantArrayType *CAType = dyn_cast<ConstantArrayType>(AType))
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NumElements = CAType->getSize().getZExtValue();
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} else if (const VectorType *VType = ILE->getType()->getAsVectorType()) {
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ElementType = VType->getElementType();
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NumElements = VType->getNumElements();
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} else
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ElementType = ILE->getType();
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for (unsigned Init = 0; Init != NumElements; ++Init) {
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if (Init >= NumInits || !ILE->getInit(Init)) {
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if (SemaRef.CheckValueInitialization(ElementType, Loc)) {
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hadError = true;
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return;
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}
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// FIXME: If value-initialization involves calling a
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// constructor, should we make that call explicit in the
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// representation (even when it means extending the
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// initializer list)?
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if (Init < NumInits && !hadError)
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ILE->setInit(Init,
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new (SemaRef.Context) ImplicitValueInitExpr(ElementType));
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}
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else if (InitListExpr *InnerILE =dyn_cast<InitListExpr>(ILE->getInit(Init)))
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FillInValueInitializations(InnerILE);
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}
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}
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InitListChecker::InitListChecker(Sema &S, InitListExpr *IL, QualType &T)
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: SemaRef(S) {
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hadError = false;
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unsigned newIndex = 0;
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unsigned newStructuredIndex = 0;
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FullyStructuredList
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= getStructuredSubobjectInit(IL, newIndex, T, 0, 0, IL->getSourceRange());
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CheckExplicitInitList(IL, T, newIndex, FullyStructuredList, newStructuredIndex,
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/*TopLevelObject=*/true);
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if (!hadError)
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FillInValueInitializations(FullyStructuredList);
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}
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int InitListChecker::numArrayElements(QualType DeclType) {
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// FIXME: use a proper constant
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int maxElements = 0x7FFFFFFF;
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if (const ConstantArrayType *CAT =
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SemaRef.Context.getAsConstantArrayType(DeclType)) {
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maxElements = static_cast<int>(CAT->getSize().getZExtValue());
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}
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return maxElements;
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}
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int InitListChecker::numStructUnionElements(QualType DeclType) {
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RecordDecl *structDecl = DeclType->getAsRecordType()->getDecl();
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int InitializableMembers = 0;
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for (RecordDecl::field_iterator Field = structDecl->field_begin(),
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FieldEnd = structDecl->field_end();
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Field != FieldEnd; ++Field) {
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if ((*Field)->getIdentifier() || !(*Field)->isBitField())
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++InitializableMembers;
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}
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if (structDecl->isUnion())
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return std::min(InitializableMembers, 1);
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return InitializableMembers - structDecl->hasFlexibleArrayMember();
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}
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void InitListChecker::CheckImplicitInitList(InitListExpr *ParentIList,
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QualType T, unsigned &Index,
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InitListExpr *StructuredList,
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unsigned &StructuredIndex,
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bool TopLevelObject) {
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int maxElements = 0;
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if (T->isArrayType())
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maxElements = numArrayElements(T);
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else if (T->isStructureType() || T->isUnionType())
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maxElements = numStructUnionElements(T);
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else if (T->isVectorType())
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maxElements = T->getAsVectorType()->getNumElements();
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else
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assert(0 && "CheckImplicitInitList(): Illegal type");
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if (maxElements == 0) {
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SemaRef.Diag(ParentIList->getInit(Index)->getLocStart(),
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diag::err_implicit_empty_initializer);
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++Index;
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hadError = true;
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return;
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}
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// Build a structured initializer list corresponding to this subobject.
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InitListExpr *StructuredSubobjectInitList
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= getStructuredSubobjectInit(ParentIList, Index, T, StructuredList,
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StructuredIndex,
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|
SourceRange(ParentIList->getInit(Index)->getSourceRange().getBegin(),
|
|
ParentIList->getSourceRange().getEnd()));
|
|
unsigned StructuredSubobjectInitIndex = 0;
|
|
|
|
// Check the element types and build the structural subobject.
|
|
unsigned StartIndex = Index;
|
|
CheckListElementTypes(ParentIList, T, false, Index,
|
|
StructuredSubobjectInitList,
|
|
StructuredSubobjectInitIndex,
|
|
TopLevelObject);
|
|
unsigned EndIndex = (Index == StartIndex? StartIndex : Index - 1);
|
|
StructuredSubobjectInitList->setType(T);
|
|
|
|
// Update the structured sub-object initializer so that it's ending
|
|
// range corresponds with the end of the last initializer it used.
|
|
if (EndIndex < ParentIList->getNumInits()) {
|
|
SourceLocation EndLoc
|
|
= ParentIList->getInit(EndIndex)->getSourceRange().getEnd();
|
|
StructuredSubobjectInitList->setRBraceLoc(EndLoc);
|
|
}
|
|
}
|
|
|
|
void InitListChecker::CheckExplicitInitList(InitListExpr *IList, QualType &T,
|
|
unsigned &Index,
|
|
InitListExpr *StructuredList,
|
|
unsigned &StructuredIndex,
|
|
bool TopLevelObject) {
|
|
assert(IList->isExplicit() && "Illegal Implicit InitListExpr");
|
|
SyntacticToSemantic[IList] = StructuredList;
|
|
StructuredList->setSyntacticForm(IList);
|
|
CheckListElementTypes(IList, T, true, Index, StructuredList,
|
|
StructuredIndex, TopLevelObject);
|
|
IList->setType(T);
|
|
StructuredList->setType(T);
|
|
if (hadError)
|
|
return;
|
|
|
|
if (Index < IList->getNumInits()) {
|
|
// We have leftover initializers
|
|
if (IList->getNumInits() > 0 &&
|
|
IsStringInit(IList->getInit(Index), T, SemaRef.Context)) {
|
|
unsigned DK = diag::warn_excess_initializers_in_char_array_initializer;
|
|
if (SemaRef.getLangOptions().CPlusPlus)
|
|
DK = diag::err_excess_initializers_in_char_array_initializer;
|
|
// Special-case
|
|
SemaRef.Diag(IList->getInit(Index)->getLocStart(), DK)
|
|
<< IList->getInit(Index)->getSourceRange();
|
|
hadError = true;
|
|
} else if (!T->isIncompleteType()) {
|
|
// Don't complain for incomplete types, since we'll get an error
|
|
// elsewhere
|
|
QualType CurrentObjectType = StructuredList->getType();
|
|
int initKind =
|
|
CurrentObjectType->isArrayType()? 0 :
|
|
CurrentObjectType->isVectorType()? 1 :
|
|
CurrentObjectType->isScalarType()? 2 :
|
|
CurrentObjectType->isUnionType()? 3 :
|
|
4;
|
|
|
|
unsigned DK = diag::warn_excess_initializers;
|
|
if (SemaRef.getLangOptions().CPlusPlus)
|
|
DK = diag::err_excess_initializers;
|
|
|
|
SemaRef.Diag(IList->getInit(Index)->getLocStart(), DK)
|
|
<< initKind << IList->getInit(Index)->getSourceRange();
|
|
}
|
|
}
|
|
|
|
if (T->isScalarType())
|
|
SemaRef.Diag(IList->getLocStart(), diag::warn_braces_around_scalar_init)
|
|
<< IList->getSourceRange();
|
|
}
|
|
|
|
void InitListChecker::CheckListElementTypes(InitListExpr *IList,
|
|
QualType &DeclType,
|
|
bool SubobjectIsDesignatorContext,
|
|
unsigned &Index,
|
|
InitListExpr *StructuredList,
|
|
unsigned &StructuredIndex,
|
|
bool TopLevelObject) {
|
|
if (DeclType->isScalarType()) {
|
|
CheckScalarType(IList, DeclType, Index, StructuredList, StructuredIndex);
|
|
} else if (DeclType->isVectorType()) {
|
|
CheckVectorType(IList, DeclType, Index, StructuredList, StructuredIndex);
|
|
} else if (DeclType->isAggregateType()) {
|
|
if (DeclType->isRecordType()) {
|
|
RecordDecl *RD = DeclType->getAsRecordType()->getDecl();
|
|
CheckStructUnionTypes(IList, DeclType, RD->field_begin(),
|
|
SubobjectIsDesignatorContext, Index,
|
|
StructuredList, StructuredIndex,
|
|
TopLevelObject);
|
|
} else if (DeclType->isArrayType()) {
|
|
llvm::APSInt Zero(
|
|
SemaRef.Context.getTypeSize(SemaRef.Context.getSizeType()),
|
|
false);
|
|
CheckArrayType(IList, DeclType, Zero, SubobjectIsDesignatorContext, Index,
|
|
StructuredList, StructuredIndex);
|
|
}
|
|
else
|
|
assert(0 && "Aggregate that isn't a structure or array?!");
|
|
} else if (DeclType->isVoidType() || DeclType->isFunctionType()) {
|
|
// This type is invalid, issue a diagnostic.
|
|
++Index;
|
|
SemaRef.Diag(IList->getLocStart(), diag::err_illegal_initializer_type)
|
|
<< DeclType;
|
|
hadError = true;
|
|
} else if (DeclType->isRecordType()) {
|
|
// C++ [dcl.init]p14:
|
|
// [...] If the class is an aggregate (8.5.1), and the initializer
|
|
// is a brace-enclosed list, see 8.5.1.
|
|
//
|
|
// Note: 8.5.1 is handled below; here, we diagnose the case where
|
|
// we have an initializer list and a destination type that is not
|
|
// an aggregate.
|
|
// FIXME: In C++0x, this is yet another form of initialization.
|
|
SemaRef.Diag(IList->getLocStart(), diag::err_init_non_aggr_init_list)
|
|
<< DeclType << IList->getSourceRange();
|
|
hadError = true;
|
|
} else if (DeclType->isReferenceType()) {
|
|
CheckReferenceType(IList, DeclType, Index, StructuredList, StructuredIndex);
|
|
} else {
|
|
// In C, all types are either scalars or aggregates, but
|
|
// additional handling is needed here for C++ (and possibly others?).
|
|
assert(0 && "Unsupported initializer type");
|
|
}
|
|
}
|
|
|
|
void InitListChecker::CheckSubElementType(InitListExpr *IList,
|
|
QualType ElemType,
|
|
unsigned &Index,
|
|
InitListExpr *StructuredList,
|
|
unsigned &StructuredIndex) {
|
|
Expr *expr = IList->getInit(Index);
|
|
if (InitListExpr *SubInitList = dyn_cast<InitListExpr>(expr)) {
|
|
unsigned newIndex = 0;
|
|
unsigned newStructuredIndex = 0;
|
|
InitListExpr *newStructuredList
|
|
= getStructuredSubobjectInit(IList, Index, ElemType,
|
|
StructuredList, StructuredIndex,
|
|
SubInitList->getSourceRange());
|
|
CheckExplicitInitList(SubInitList, ElemType, newIndex,
|
|
newStructuredList, newStructuredIndex);
|
|
++StructuredIndex;
|
|
++Index;
|
|
} else if (Expr *Str = IsStringInit(expr, ElemType, SemaRef.Context)) {
|
|
CheckStringInit(Str, ElemType, SemaRef);
|
|
UpdateStructuredListElement(StructuredList, StructuredIndex, Str);
|
|
++Index;
|
|
} else if (ElemType->isScalarType()) {
|
|
CheckScalarType(IList, ElemType, Index, StructuredList, StructuredIndex);
|
|
} else if (ElemType->isReferenceType()) {
|
|
CheckReferenceType(IList, ElemType, Index, StructuredList, StructuredIndex);
|
|
} else {
|
|
if (SemaRef.getLangOptions().CPlusPlus) {
|
|
// C++ [dcl.init.aggr]p12:
|
|
// All implicit type conversions (clause 4) are considered when
|
|
// initializing the aggregate member with an ini- tializer from
|
|
// an initializer-list. If the initializer can initialize a
|
|
// member, the member is initialized. [...]
|
|
ImplicitConversionSequence ICS
|
|
= SemaRef.TryCopyInitialization(expr, ElemType);
|
|
if (ICS.ConversionKind != ImplicitConversionSequence::BadConversion) {
|
|
if (SemaRef.PerformImplicitConversion(expr, ElemType, ICS,
|
|
"initializing"))
|
|
hadError = true;
|
|
UpdateStructuredListElement(StructuredList, StructuredIndex, expr);
|
|
++Index;
|
|
return;
|
|
}
|
|
|
|
// Fall through for subaggregate initialization
|
|
} else {
|
|
// C99 6.7.8p13:
|
|
//
|
|
// The initializer for a structure or union object that has
|
|
// automatic storage duration shall be either an initializer
|
|
// list as described below, or a single expression that has
|
|
// compatible structure or union type. In the latter case, the
|
|
// initial value of the object, including unnamed members, is
|
|
// that of the expression.
|
|
QualType ExprType = SemaRef.Context.getCanonicalType(expr->getType());
|
|
QualType ElemTypeCanon = SemaRef.Context.getCanonicalType(ElemType);
|
|
if (SemaRef.Context.typesAreCompatible(ExprType.getUnqualifiedType(),
|
|
ElemTypeCanon.getUnqualifiedType())) {
|
|
UpdateStructuredListElement(StructuredList, StructuredIndex, expr);
|
|
++Index;
|
|
return;
|
|
}
|
|
|
|
// Fall through for subaggregate initialization
|
|
}
|
|
|
|
// C++ [dcl.init.aggr]p12:
|
|
//
|
|
// [...] Otherwise, if the member is itself a non-empty
|
|
// subaggregate, brace elision is assumed and the initializer is
|
|
// considered for the initialization of the first member of
|
|
// the subaggregate.
|
|
if (ElemType->isAggregateType() || ElemType->isVectorType()) {
|
|
CheckImplicitInitList(IList, ElemType, Index, StructuredList,
|
|
StructuredIndex);
|
|
++StructuredIndex;
|
|
} else {
|
|
// We cannot initialize this element, so let
|
|
// PerformCopyInitialization produce the appropriate diagnostic.
|
|
SemaRef.PerformCopyInitialization(expr, ElemType, "initializing");
|
|
hadError = true;
|
|
++Index;
|
|
++StructuredIndex;
|
|
}
|
|
}
|
|
}
|
|
|
|
void InitListChecker::CheckScalarType(InitListExpr *IList, QualType DeclType,
|
|
unsigned &Index,
|
|
InitListExpr *StructuredList,
|
|
unsigned &StructuredIndex) {
|
|
if (Index < IList->getNumInits()) {
|
|
Expr *expr = IList->getInit(Index);
|
|
if (isa<InitListExpr>(expr)) {
|
|
SemaRef.Diag(IList->getLocStart(),
|
|
diag::err_many_braces_around_scalar_init)
|
|
<< IList->getSourceRange();
|
|
hadError = true;
|
|
++Index;
|
|
++StructuredIndex;
|
|
return;
|
|
} else if (isa<DesignatedInitExpr>(expr)) {
|
|
SemaRef.Diag(expr->getSourceRange().getBegin(),
|
|
diag::err_designator_for_scalar_init)
|
|
<< DeclType << expr->getSourceRange();
|
|
hadError = true;
|
|
++Index;
|
|
++StructuredIndex;
|
|
return;
|
|
}
|
|
|
|
Expr *savExpr = expr; // Might be promoted by CheckSingleInitializer.
|
|
if (CheckSingleInitializer(expr, DeclType, false, SemaRef))
|
|
hadError = true; // types weren't compatible.
|
|
else if (savExpr != expr) {
|
|
// The type was promoted, update initializer list.
|
|
IList->setInit(Index, expr);
|
|
}
|
|
if (hadError)
|
|
++StructuredIndex;
|
|
else
|
|
UpdateStructuredListElement(StructuredList, StructuredIndex, expr);
|
|
++Index;
|
|
} else {
|
|
SemaRef.Diag(IList->getLocStart(), diag::err_empty_scalar_initializer)
|
|
<< IList->getSourceRange();
|
|
hadError = true;
|
|
++Index;
|
|
++StructuredIndex;
|
|
return;
|
|
}
|
|
}
|
|
|
|
void InitListChecker::CheckReferenceType(InitListExpr *IList, QualType DeclType,
|
|
unsigned &Index,
|
|
InitListExpr *StructuredList,
|
|
unsigned &StructuredIndex) {
|
|
if (Index < IList->getNumInits()) {
|
|
Expr *expr = IList->getInit(Index);
|
|
if (isa<InitListExpr>(expr)) {
|
|
SemaRef.Diag(IList->getLocStart(), diag::err_init_non_aggr_init_list)
|
|
<< DeclType << IList->getSourceRange();
|
|
hadError = true;
|
|
++Index;
|
|
++StructuredIndex;
|
|
return;
|
|
}
|
|
|
|
Expr *savExpr = expr; // Might be promoted by CheckSingleInitializer.
|
|
if (SemaRef.CheckReferenceInit(expr, DeclType))
|
|
hadError = true;
|
|
else if (savExpr != expr) {
|
|
// The type was promoted, update initializer list.
|
|
IList->setInit(Index, expr);
|
|
}
|
|
if (hadError)
|
|
++StructuredIndex;
|
|
else
|
|
UpdateStructuredListElement(StructuredList, StructuredIndex, expr);
|
|
++Index;
|
|
} else {
|
|
// FIXME: It would be wonderful if we could point at the actual
|
|
// member. In general, it would be useful to pass location
|
|
// information down the stack, so that we know the location (or
|
|
// decl) of the "current object" being initialized.
|
|
SemaRef.Diag(IList->getLocStart(),
|
|
diag::err_init_reference_member_uninitialized)
|
|
<< DeclType
|
|
<< IList->getSourceRange();
|
|
hadError = true;
|
|
++Index;
|
|
++StructuredIndex;
|
|
return;
|
|
}
|
|
}
|
|
|
|
void InitListChecker::CheckVectorType(InitListExpr *IList, QualType DeclType,
|
|
unsigned &Index,
|
|
InitListExpr *StructuredList,
|
|
unsigned &StructuredIndex) {
|
|
if (Index < IList->getNumInits()) {
|
|
const VectorType *VT = DeclType->getAsVectorType();
|
|
int maxElements = VT->getNumElements();
|
|
QualType elementType = VT->getElementType();
|
|
|
|
for (int i = 0; i < maxElements; ++i) {
|
|
// Don't attempt to go past the end of the init list
|
|
if (Index >= IList->getNumInits())
|
|
break;
|
|
CheckSubElementType(IList, elementType, Index,
|
|
StructuredList, StructuredIndex);
|
|
}
|
|
}
|
|
}
|
|
|
|
void InitListChecker::CheckArrayType(InitListExpr *IList, QualType &DeclType,
|
|
llvm::APSInt elementIndex,
|
|
bool SubobjectIsDesignatorContext,
|
|
unsigned &Index,
|
|
InitListExpr *StructuredList,
|
|
unsigned &StructuredIndex) {
|
|
// Check for the special-case of initializing an array with a string.
|
|
if (Index < IList->getNumInits()) {
|
|
if (Expr *Str = IsStringInit(IList->getInit(Index), DeclType,
|
|
SemaRef.Context)) {
|
|
CheckStringInit(Str, DeclType, SemaRef);
|
|
// We place the string literal directly into the resulting
|
|
// initializer list. This is the only place where the structure
|
|
// of the structured initializer list doesn't match exactly,
|
|
// because doing so would involve allocating one character
|
|
// constant for each string.
|
|
UpdateStructuredListElement(StructuredList, StructuredIndex, Str);
|
|
StructuredList->resizeInits(SemaRef.Context, StructuredIndex);
|
|
++Index;
|
|
return;
|
|
}
|
|
}
|
|
if (const VariableArrayType *VAT =
|
|
SemaRef.Context.getAsVariableArrayType(DeclType)) {
|
|
// Check for VLAs; in standard C it would be possible to check this
|
|
// earlier, but I don't know where clang accepts VLAs (gcc accepts
|
|
// them in all sorts of strange places).
|
|
SemaRef.Diag(VAT->getSizeExpr()->getLocStart(),
|
|
diag::err_variable_object_no_init)
|
|
<< VAT->getSizeExpr()->getSourceRange();
|
|
hadError = true;
|
|
++Index;
|
|
++StructuredIndex;
|
|
return;
|
|
}
|
|
|
|
// We might know the maximum number of elements in advance.
|
|
llvm::APSInt maxElements(elementIndex.getBitWidth(),
|
|
elementIndex.isUnsigned());
|
|
bool maxElementsKnown = false;
|
|
if (const ConstantArrayType *CAT =
|
|
SemaRef.Context.getAsConstantArrayType(DeclType)) {
|
|
maxElements = CAT->getSize();
|
|
elementIndex.extOrTrunc(maxElements.getBitWidth());
|
|
elementIndex.setIsUnsigned(maxElements.isUnsigned());
|
|
maxElementsKnown = true;
|
|
}
|
|
|
|
QualType elementType = SemaRef.Context.getAsArrayType(DeclType)
|
|
->getElementType();
|
|
while (Index < IList->getNumInits()) {
|
|
Expr *Init = IList->getInit(Index);
|
|
if (DesignatedInitExpr *DIE = dyn_cast<DesignatedInitExpr>(Init)) {
|
|
// If we're not the subobject that matches up with the '{' for
|
|
// the designator, we shouldn't be handling the
|
|
// designator. Return immediately.
|
|
if (!SubobjectIsDesignatorContext)
|
|
return;
|
|
|
|
// Handle this designated initializer. elementIndex will be
|
|
// updated to be the next array element we'll initialize.
|
|
if (CheckDesignatedInitializer(IList, DIE, DIE->designators_begin(),
|
|
DeclType, 0, &elementIndex, Index,
|
|
StructuredList, StructuredIndex, true,
|
|
false)) {
|
|
hadError = true;
|
|
continue;
|
|
}
|
|
|
|
if (elementIndex.getBitWidth() > maxElements.getBitWidth())
|
|
maxElements.extend(elementIndex.getBitWidth());
|
|
else if (elementIndex.getBitWidth() < maxElements.getBitWidth())
|
|
elementIndex.extend(maxElements.getBitWidth());
|
|
elementIndex.setIsUnsigned(maxElements.isUnsigned());
|
|
|
|
// If the array is of incomplete type, keep track of the number of
|
|
// elements in the initializer.
|
|
if (!maxElementsKnown && elementIndex > maxElements)
|
|
maxElements = elementIndex;
|
|
|
|
continue;
|
|
}
|
|
|
|
// If we know the maximum number of elements, and we've already
|
|
// hit it, stop consuming elements in the initializer list.
|
|
if (maxElementsKnown && elementIndex == maxElements)
|
|
break;
|
|
|
|
// Check this element.
|
|
CheckSubElementType(IList, elementType, Index,
|
|
StructuredList, StructuredIndex);
|
|
++elementIndex;
|
|
|
|
// If the array is of incomplete type, keep track of the number of
|
|
// elements in the initializer.
|
|
if (!maxElementsKnown && elementIndex > maxElements)
|
|
maxElements = elementIndex;
|
|
}
|
|
if (DeclType->isIncompleteArrayType()) {
|
|
// If this is an incomplete array type, the actual type needs to
|
|
// be calculated here.
|
|
llvm::APSInt Zero(maxElements.getBitWidth(), maxElements.isUnsigned());
|
|
if (maxElements == Zero) {
|
|
// Sizing an array implicitly to zero is not allowed by ISO C,
|
|
// but is supported by GNU.
|
|
SemaRef.Diag(IList->getLocStart(),
|
|
diag::ext_typecheck_zero_array_size);
|
|
}
|
|
|
|
DeclType = SemaRef.Context.getConstantArrayType(elementType, maxElements,
|
|
ArrayType::Normal, 0);
|
|
}
|
|
}
|
|
|
|
void InitListChecker::CheckStructUnionTypes(InitListExpr *IList,
|
|
QualType DeclType,
|
|
RecordDecl::field_iterator Field,
|
|
bool SubobjectIsDesignatorContext,
|
|
unsigned &Index,
|
|
InitListExpr *StructuredList,
|
|
unsigned &StructuredIndex,
|
|
bool TopLevelObject) {
|
|
RecordDecl* structDecl = DeclType->getAsRecordType()->getDecl();
|
|
|
|
// If the record is invalid, some of it's members are invalid. To avoid
|
|
// confusion, we forgo checking the intializer for the entire record.
|
|
if (structDecl->isInvalidDecl()) {
|
|
hadError = true;
|
|
return;
|
|
}
|
|
|
|
if (DeclType->isUnionType() && IList->getNumInits() == 0) {
|
|
// Value-initialize the first named member of the union.
|
|
RecordDecl *RD = DeclType->getAsRecordType()->getDecl();
|
|
for (RecordDecl::field_iterator FieldEnd = RD->field_end();
|
|
Field != FieldEnd; ++Field) {
|
|
if (Field->getDeclName()) {
|
|
StructuredList->setInitializedFieldInUnion(*Field);
|
|
break;
|
|
}
|
|
}
|
|
return;
|
|
}
|
|
|
|
// If structDecl is a forward declaration, this loop won't do
|
|
// anything except look at designated initializers; That's okay,
|
|
// because an error should get printed out elsewhere. It might be
|
|
// worthwhile to skip over the rest of the initializer, though.
|
|
RecordDecl *RD = DeclType->getAsRecordType()->getDecl();
|
|
RecordDecl::field_iterator FieldEnd = RD->field_end();
|
|
bool InitializedSomething = false;
|
|
while (Index < IList->getNumInits()) {
|
|
Expr *Init = IList->getInit(Index);
|
|
|
|
if (DesignatedInitExpr *DIE = dyn_cast<DesignatedInitExpr>(Init)) {
|
|
// If we're not the subobject that matches up with the '{' for
|
|
// the designator, we shouldn't be handling the
|
|
// designator. Return immediately.
|
|
if (!SubobjectIsDesignatorContext)
|
|
return;
|
|
|
|
// Handle this designated initializer. Field will be updated to
|
|
// the next field that we'll be initializing.
|
|
if (CheckDesignatedInitializer(IList, DIE, DIE->designators_begin(),
|
|
DeclType, &Field, 0, Index,
|
|
StructuredList, StructuredIndex,
|
|
true, TopLevelObject))
|
|
hadError = true;
|
|
|
|
InitializedSomething = true;
|
|
continue;
|
|
}
|
|
|
|
if (Field == FieldEnd) {
|
|
// We've run out of fields. We're done.
|
|
break;
|
|
}
|
|
|
|
// We've already initialized a member of a union. We're done.
|
|
if (InitializedSomething && DeclType->isUnionType())
|
|
break;
|
|
|
|
// If we've hit the flexible array member at the end, we're done.
|
|
if (Field->getType()->isIncompleteArrayType())
|
|
break;
|
|
|
|
if (Field->isUnnamedBitfield()) {
|
|
// Don't initialize unnamed bitfields, e.g. "int : 20;"
|
|
++Field;
|
|
continue;
|
|
}
|
|
|
|
CheckSubElementType(IList, Field->getType(), Index,
|
|
StructuredList, StructuredIndex);
|
|
InitializedSomething = true;
|
|
|
|
if (DeclType->isUnionType()) {
|
|
// Initialize the first field within the union.
|
|
StructuredList->setInitializedFieldInUnion(*Field);
|
|
}
|
|
|
|
++Field;
|
|
}
|
|
|
|
if (Field == FieldEnd || !Field->getType()->isIncompleteArrayType() ||
|
|
Index >= IList->getNumInits())
|
|
return;
|
|
|
|
// Handle GNU flexible array initializers.
|
|
if (!TopLevelObject &&
|
|
(!isa<InitListExpr>(IList->getInit(Index)) ||
|
|
cast<InitListExpr>(IList->getInit(Index))->getNumInits() > 0)) {
|
|
SemaRef.Diag(IList->getInit(Index)->getSourceRange().getBegin(),
|
|
diag::err_flexible_array_init_nonempty)
|
|
<< IList->getInit(Index)->getSourceRange().getBegin();
|
|
SemaRef.Diag(Field->getLocation(), diag::note_flexible_array_member)
|
|
<< *Field;
|
|
hadError = true;
|
|
++Index;
|
|
return;
|
|
} else {
|
|
SemaRef.Diag(IList->getInit(Index)->getSourceRange().getBegin(),
|
|
diag::ext_flexible_array_init)
|
|
<< IList->getInit(Index)->getSourceRange().getBegin();
|
|
SemaRef.Diag(Field->getLocation(), diag::note_flexible_array_member)
|
|
<< *Field;
|
|
}
|
|
|
|
if (isa<InitListExpr>(IList->getInit(Index)))
|
|
CheckSubElementType(IList, Field->getType(), Index, StructuredList,
|
|
StructuredIndex);
|
|
else
|
|
CheckImplicitInitList(IList, Field->getType(), Index, StructuredList,
|
|
StructuredIndex);
|
|
}
|
|
|
|
/// @brief Check the well-formedness of a C99 designated initializer.
|
|
///
|
|
/// Determines whether the designated initializer @p DIE, which
|
|
/// resides at the given @p Index within the initializer list @p
|
|
/// IList, is well-formed for a current object of type @p DeclType
|
|
/// (C99 6.7.8). The actual subobject that this designator refers to
|
|
/// within the current subobject is returned in either
|
|
/// @p NextField or @p NextElementIndex (whichever is appropriate).
|
|
///
|
|
/// @param IList The initializer list in which this designated
|
|
/// initializer occurs.
|
|
///
|
|
/// @param DIE The designated initializer and its initialization
|
|
/// expression.
|
|
///
|
|
/// @param DeclType The type of the "current object" (C99 6.7.8p17),
|
|
/// into which the designation in @p DIE should refer.
|
|
///
|
|
/// @param NextField If non-NULL and the first designator in @p DIE is
|
|
/// a field, this will be set to the field declaration corresponding
|
|
/// to the field named by the designator.
|
|
///
|
|
/// @param NextElementIndex If non-NULL and the first designator in @p
|
|
/// DIE is an array designator or GNU array-range designator, this
|
|
/// will be set to the last index initialized by this designator.
|
|
///
|
|
/// @param Index Index into @p IList where the designated initializer
|
|
/// @p DIE occurs.
|
|
///
|
|
/// @param StructuredList The initializer list expression that
|
|
/// describes all of the subobject initializers in the order they'll
|
|
/// actually be initialized.
|
|
///
|
|
/// @returns true if there was an error, false otherwise.
|
|
bool
|
|
InitListChecker::CheckDesignatedInitializer(InitListExpr *IList,
|
|
DesignatedInitExpr *DIE,
|
|
DesignatedInitExpr::designators_iterator D,
|
|
QualType &CurrentObjectType,
|
|
RecordDecl::field_iterator *NextField,
|
|
llvm::APSInt *NextElementIndex,
|
|
unsigned &Index,
|
|
InitListExpr *StructuredList,
|
|
unsigned &StructuredIndex,
|
|
bool FinishSubobjectInit,
|
|
bool TopLevelObject) {
|
|
if (D == DIE->designators_end()) {
|
|
// Check the actual initialization for the designated object type.
|
|
bool prevHadError = hadError;
|
|
|
|
// Temporarily remove the designator expression from the
|
|
// initializer list that the child calls see, so that we don't try
|
|
// to re-process the designator.
|
|
unsigned OldIndex = Index;
|
|
IList->setInit(OldIndex, DIE->getInit());
|
|
|
|
CheckSubElementType(IList, CurrentObjectType, Index,
|
|
StructuredList, StructuredIndex);
|
|
|
|
// Restore the designated initializer expression in the syntactic
|
|
// form of the initializer list.
|
|
if (IList->getInit(OldIndex) != DIE->getInit())
|
|
DIE->setInit(IList->getInit(OldIndex));
|
|
IList->setInit(OldIndex, DIE);
|
|
|
|
return hadError && !prevHadError;
|
|
}
|
|
|
|
bool IsFirstDesignator = (D == DIE->designators_begin());
|
|
assert((IsFirstDesignator || StructuredList) &&
|
|
"Need a non-designated initializer list to start from");
|
|
|
|
// Determine the structural initializer list that corresponds to the
|
|
// current subobject.
|
|
StructuredList = IsFirstDesignator? SyntacticToSemantic[IList]
|
|
: getStructuredSubobjectInit(IList, Index, CurrentObjectType,
|
|
StructuredList, StructuredIndex,
|
|
SourceRange(D->getStartLocation(),
|
|
DIE->getSourceRange().getEnd()));
|
|
assert(StructuredList && "Expected a structured initializer list");
|
|
|
|
if (D->isFieldDesignator()) {
|
|
// C99 6.7.8p7:
|
|
//
|
|
// If a designator has the form
|
|
//
|
|
// . identifier
|
|
//
|
|
// then the current object (defined below) shall have
|
|
// structure or union type and the identifier shall be the
|
|
// name of a member of that type.
|
|
const RecordType *RT = CurrentObjectType->getAsRecordType();
|
|
if (!RT) {
|
|
SourceLocation Loc = D->getDotLoc();
|
|
if (Loc.isInvalid())
|
|
Loc = D->getFieldLoc();
|
|
SemaRef.Diag(Loc, diag::err_field_designator_non_aggr)
|
|
<< SemaRef.getLangOptions().CPlusPlus << CurrentObjectType;
|
|
++Index;
|
|
return true;
|
|
}
|
|
|
|
// Note: we perform a linear search of the fields here, despite
|
|
// the fact that we have a faster lookup method, because we always
|
|
// need to compute the field's index.
|
|
IdentifierInfo *FieldName = D->getFieldName();
|
|
unsigned FieldIndex = 0;
|
|
RecordDecl::field_iterator Field = RT->getDecl()->field_begin(),
|
|
FieldEnd = RT->getDecl()->field_end();
|
|
for (; Field != FieldEnd; ++Field) {
|
|
if (Field->isUnnamedBitfield())
|
|
continue;
|
|
|
|
if (Field->getIdentifier() == FieldName)
|
|
break;
|
|
|
|
++FieldIndex;
|
|
}
|
|
|
|
if (Field == FieldEnd) {
|
|
// We did not find the field we're looking for. Produce a
|
|
// suitable diagnostic and return a failure.
|
|
DeclContext::lookup_result Lookup = RT->getDecl()->lookup(FieldName);
|
|
if (Lookup.first == Lookup.second) {
|
|
// Name lookup didn't find anything.
|
|
SemaRef.Diag(D->getFieldLoc(), diag::err_field_designator_unknown)
|
|
<< FieldName << CurrentObjectType;
|
|
} else {
|
|
// Name lookup found something, but it wasn't a field.
|
|
SemaRef.Diag(D->getFieldLoc(), diag::err_field_designator_nonfield)
|
|
<< FieldName;
|
|
SemaRef.Diag((*Lookup.first)->getLocation(),
|
|
diag::note_field_designator_found);
|
|
}
|
|
|
|
++Index;
|
|
return true;
|
|
} else if (cast<RecordDecl>((*Field)->getDeclContext())
|
|
->isAnonymousStructOrUnion()) {
|
|
SemaRef.Diag(D->getFieldLoc(), diag::err_field_designator_anon_class)
|
|
<< FieldName
|
|
<< (cast<RecordDecl>((*Field)->getDeclContext())->isUnion()? 2 :
|
|
(int)SemaRef.getLangOptions().CPlusPlus);
|
|
SemaRef.Diag((*Field)->getLocation(), diag::note_field_designator_found);
|
|
++Index;
|
|
return true;
|
|
}
|
|
|
|
// All of the fields of a union are located at the same place in
|
|
// the initializer list.
|
|
if (RT->getDecl()->isUnion()) {
|
|
FieldIndex = 0;
|
|
StructuredList->setInitializedFieldInUnion(*Field);
|
|
}
|
|
|
|
// Update the designator with the field declaration.
|
|
D->setField(*Field);
|
|
|
|
// Make sure that our non-designated initializer list has space
|
|
// for a subobject corresponding to this field.
|
|
if (FieldIndex >= StructuredList->getNumInits())
|
|
StructuredList->resizeInits(SemaRef.Context, FieldIndex + 1);
|
|
|
|
// This designator names a flexible array member.
|
|
if (Field->getType()->isIncompleteArrayType()) {
|
|
bool Invalid = false;
|
|
DesignatedInitExpr::designators_iterator NextD = D;
|
|
++NextD;
|
|
if (NextD != DIE->designators_end()) {
|
|
// We can't designate an object within the flexible array
|
|
// member (because GCC doesn't allow it).
|
|
SemaRef.Diag(NextD->getStartLocation(),
|
|
diag::err_designator_into_flexible_array_member)
|
|
<< SourceRange(NextD->getStartLocation(),
|
|
DIE->getSourceRange().getEnd());
|
|
SemaRef.Diag(Field->getLocation(), diag::note_flexible_array_member)
|
|
<< *Field;
|
|
Invalid = true;
|
|
}
|
|
|
|
if (!hadError && !isa<InitListExpr>(DIE->getInit())) {
|
|
// The initializer is not an initializer list.
|
|
SemaRef.Diag(DIE->getInit()->getSourceRange().getBegin(),
|
|
diag::err_flexible_array_init_needs_braces)
|
|
<< DIE->getInit()->getSourceRange();
|
|
SemaRef.Diag(Field->getLocation(), diag::note_flexible_array_member)
|
|
<< *Field;
|
|
Invalid = true;
|
|
}
|
|
|
|
// Handle GNU flexible array initializers.
|
|
if (!Invalid && !TopLevelObject &&
|
|
cast<InitListExpr>(DIE->getInit())->getNumInits() > 0) {
|
|
SemaRef.Diag(DIE->getSourceRange().getBegin(),
|
|
diag::err_flexible_array_init_nonempty)
|
|
<< DIE->getSourceRange().getBegin();
|
|
SemaRef.Diag(Field->getLocation(), diag::note_flexible_array_member)
|
|
<< *Field;
|
|
Invalid = true;
|
|
}
|
|
|
|
if (Invalid) {
|
|
++Index;
|
|
return true;
|
|
}
|
|
|
|
// Initialize the array.
|
|
bool prevHadError = hadError;
|
|
unsigned newStructuredIndex = FieldIndex;
|
|
unsigned OldIndex = Index;
|
|
IList->setInit(Index, DIE->getInit());
|
|
CheckSubElementType(IList, Field->getType(), Index,
|
|
StructuredList, newStructuredIndex);
|
|
IList->setInit(OldIndex, DIE);
|
|
if (hadError && !prevHadError) {
|
|
++Field;
|
|
++FieldIndex;
|
|
if (NextField)
|
|
*NextField = Field;
|
|
StructuredIndex = FieldIndex;
|
|
return true;
|
|
}
|
|
} else {
|
|
// Recurse to check later designated subobjects.
|
|
QualType FieldType = (*Field)->getType();
|
|
unsigned newStructuredIndex = FieldIndex;
|
|
if (CheckDesignatedInitializer(IList, DIE, ++D, FieldType, 0, 0, Index,
|
|
StructuredList, newStructuredIndex,
|
|
true, false))
|
|
return true;
|
|
}
|
|
|
|
// Find the position of the next field to be initialized in this
|
|
// subobject.
|
|
++Field;
|
|
++FieldIndex;
|
|
|
|
// If this the first designator, our caller will continue checking
|
|
// the rest of this struct/class/union subobject.
|
|
if (IsFirstDesignator) {
|
|
if (NextField)
|
|
*NextField = Field;
|
|
StructuredIndex = FieldIndex;
|
|
return false;
|
|
}
|
|
|
|
if (!FinishSubobjectInit)
|
|
return false;
|
|
|
|
// Check the remaining fields within this class/struct/union subobject.
|
|
bool prevHadError = hadError;
|
|
CheckStructUnionTypes(IList, CurrentObjectType, Field, false, Index,
|
|
StructuredList, FieldIndex);
|
|
return hadError && !prevHadError;
|
|
}
|
|
|
|
// C99 6.7.8p6:
|
|
//
|
|
// If a designator has the form
|
|
//
|
|
// [ constant-expression ]
|
|
//
|
|
// then the current object (defined below) shall have array
|
|
// type and the expression shall be an integer constant
|
|
// expression. If the array is of unknown size, any
|
|
// nonnegative value is valid.
|
|
//
|
|
// Additionally, cope with the GNU extension that permits
|
|
// designators of the form
|
|
//
|
|
// [ constant-expression ... constant-expression ]
|
|
const ArrayType *AT = SemaRef.Context.getAsArrayType(CurrentObjectType);
|
|
if (!AT) {
|
|
SemaRef.Diag(D->getLBracketLoc(), diag::err_array_designator_non_array)
|
|
<< CurrentObjectType;
|
|
++Index;
|
|
return true;
|
|
}
|
|
|
|
Expr *IndexExpr = 0;
|
|
llvm::APSInt DesignatedStartIndex, DesignatedEndIndex;
|
|
if (D->isArrayDesignator()) {
|
|
IndexExpr = DIE->getArrayIndex(*D);
|
|
|
|
bool ConstExpr
|
|
= IndexExpr->isIntegerConstantExpr(DesignatedStartIndex, SemaRef.Context);
|
|
assert(ConstExpr && "Expression must be constant"); (void)ConstExpr;
|
|
|
|
DesignatedEndIndex = DesignatedStartIndex;
|
|
} else {
|
|
assert(D->isArrayRangeDesignator() && "Need array-range designator");
|
|
|
|
bool StartConstExpr
|
|
= DIE->getArrayRangeStart(*D)->isIntegerConstantExpr(DesignatedStartIndex,
|
|
SemaRef.Context);
|
|
assert(StartConstExpr && "Expression must be constant"); (void)StartConstExpr;
|
|
|
|
bool EndConstExpr
|
|
= DIE->getArrayRangeEnd(*D)->isIntegerConstantExpr(DesignatedEndIndex,
|
|
SemaRef.Context);
|
|
assert(EndConstExpr && "Expression must be constant"); (void)EndConstExpr;
|
|
|
|
IndexExpr = DIE->getArrayRangeEnd(*D);
|
|
|
|
if (DesignatedStartIndex.getZExtValue() != DesignatedEndIndex.getZExtValue())
|
|
FullyStructuredList->sawArrayRangeDesignator();
|
|
}
|
|
|
|
if (isa<ConstantArrayType>(AT)) {
|
|
llvm::APSInt MaxElements(cast<ConstantArrayType>(AT)->getSize(), false);
|
|
DesignatedStartIndex.extOrTrunc(MaxElements.getBitWidth());
|
|
DesignatedStartIndex.setIsUnsigned(MaxElements.isUnsigned());
|
|
DesignatedEndIndex.extOrTrunc(MaxElements.getBitWidth());
|
|
DesignatedEndIndex.setIsUnsigned(MaxElements.isUnsigned());
|
|
if (DesignatedEndIndex >= MaxElements) {
|
|
SemaRef.Diag(IndexExpr->getSourceRange().getBegin(),
|
|
diag::err_array_designator_too_large)
|
|
<< DesignatedEndIndex.toString(10) << MaxElements.toString(10)
|
|
<< IndexExpr->getSourceRange();
|
|
++Index;
|
|
return true;
|
|
}
|
|
} else {
|
|
// Make sure the bit-widths and signedness match.
|
|
if (DesignatedStartIndex.getBitWidth() > DesignatedEndIndex.getBitWidth())
|
|
DesignatedEndIndex.extend(DesignatedStartIndex.getBitWidth());
|
|
else if (DesignatedStartIndex.getBitWidth() < DesignatedEndIndex.getBitWidth())
|
|
DesignatedStartIndex.extend(DesignatedEndIndex.getBitWidth());
|
|
DesignatedStartIndex.setIsUnsigned(true);
|
|
DesignatedEndIndex.setIsUnsigned(true);
|
|
}
|
|
|
|
// Make sure that our non-designated initializer list has space
|
|
// for a subobject corresponding to this array element.
|
|
if (DesignatedEndIndex.getZExtValue() >= StructuredList->getNumInits())
|
|
StructuredList->resizeInits(SemaRef.Context,
|
|
DesignatedEndIndex.getZExtValue() + 1);
|
|
|
|
// Repeatedly perform subobject initializations in the range
|
|
// [DesignatedStartIndex, DesignatedEndIndex].
|
|
|
|
// Move to the next designator
|
|
unsigned ElementIndex = DesignatedStartIndex.getZExtValue();
|
|
unsigned OldIndex = Index;
|
|
++D;
|
|
while (DesignatedStartIndex <= DesignatedEndIndex) {
|
|
// Recurse to check later designated subobjects.
|
|
QualType ElementType = AT->getElementType();
|
|
Index = OldIndex;
|
|
if (CheckDesignatedInitializer(IList, DIE, D, ElementType, 0, 0, Index,
|
|
StructuredList, ElementIndex,
|
|
(DesignatedStartIndex == DesignatedEndIndex),
|
|
false))
|
|
return true;
|
|
|
|
// Move to the next index in the array that we'll be initializing.
|
|
++DesignatedStartIndex;
|
|
ElementIndex = DesignatedStartIndex.getZExtValue();
|
|
}
|
|
|
|
// If this the first designator, our caller will continue checking
|
|
// the rest of this array subobject.
|
|
if (IsFirstDesignator) {
|
|
if (NextElementIndex)
|
|
*NextElementIndex = DesignatedStartIndex;
|
|
StructuredIndex = ElementIndex;
|
|
return false;
|
|
}
|
|
|
|
if (!FinishSubobjectInit)
|
|
return false;
|
|
|
|
// Check the remaining elements within this array subobject.
|
|
bool prevHadError = hadError;
|
|
CheckArrayType(IList, CurrentObjectType, DesignatedStartIndex, false, Index,
|
|
StructuredList, ElementIndex);
|
|
return hadError && !prevHadError;
|
|
}
|
|
|
|
// Get the structured initializer list for a subobject of type
|
|
// @p CurrentObjectType.
|
|
InitListExpr *
|
|
InitListChecker::getStructuredSubobjectInit(InitListExpr *IList, unsigned Index,
|
|
QualType CurrentObjectType,
|
|
InitListExpr *StructuredList,
|
|
unsigned StructuredIndex,
|
|
SourceRange InitRange) {
|
|
Expr *ExistingInit = 0;
|
|
if (!StructuredList)
|
|
ExistingInit = SyntacticToSemantic[IList];
|
|
else if (StructuredIndex < StructuredList->getNumInits())
|
|
ExistingInit = StructuredList->getInit(StructuredIndex);
|
|
|
|
if (InitListExpr *Result = dyn_cast_or_null<InitListExpr>(ExistingInit))
|
|
return Result;
|
|
|
|
if (ExistingInit) {
|
|
// We are creating an initializer list that initializes the
|
|
// subobjects of the current object, but there was already an
|
|
// initialization that completely initialized the current
|
|
// subobject, e.g., by a compound literal:
|
|
//
|
|
// struct X { int a, b; };
|
|
// struct X xs[] = { [0] = (struct X) { 1, 2 }, [0].b = 3 };
|
|
//
|
|
// Here, xs[0].a == 0 and xs[0].b == 3, since the second,
|
|
// designated initializer re-initializes the whole
|
|
// subobject [0], overwriting previous initializers.
|
|
SemaRef.Diag(InitRange.getBegin(),
|
|
diag::warn_subobject_initializer_overrides)
|
|
<< InitRange;
|
|
SemaRef.Diag(ExistingInit->getSourceRange().getBegin(),
|
|
diag::note_previous_initializer)
|
|
<< /*FIXME:has side effects=*/0
|
|
<< ExistingInit->getSourceRange();
|
|
}
|
|
|
|
InitListExpr *Result
|
|
= new (SemaRef.Context) InitListExpr(InitRange.getBegin(), 0, 0,
|
|
InitRange.getEnd());
|
|
|
|
Result->setType(CurrentObjectType);
|
|
|
|
// Pre-allocate storage for the structured initializer list.
|
|
unsigned NumElements = 0;
|
|
unsigned NumInits = 0;
|
|
if (!StructuredList)
|
|
NumInits = IList->getNumInits();
|
|
else if (Index < IList->getNumInits()) {
|
|
if (InitListExpr *SubList = dyn_cast<InitListExpr>(IList->getInit(Index)))
|
|
NumInits = SubList->getNumInits();
|
|
}
|
|
|
|
if (const ArrayType *AType
|
|
= SemaRef.Context.getAsArrayType(CurrentObjectType)) {
|
|
if (const ConstantArrayType *CAType = dyn_cast<ConstantArrayType>(AType)) {
|
|
NumElements = CAType->getSize().getZExtValue();
|
|
// Simple heuristic so that we don't allocate a very large
|
|
// initializer with many empty entries at the end.
|
|
if (NumInits && NumElements > NumInits)
|
|
NumElements = 0;
|
|
}
|
|
} else if (const VectorType *VType = CurrentObjectType->getAsVectorType())
|
|
NumElements = VType->getNumElements();
|
|
else if (const RecordType *RType = CurrentObjectType->getAsRecordType()) {
|
|
RecordDecl *RDecl = RType->getDecl();
|
|
if (RDecl->isUnion())
|
|
NumElements = 1;
|
|
else
|
|
NumElements = std::distance(RDecl->field_begin(), RDecl->field_end());
|
|
}
|
|
|
|
if (NumElements < NumInits)
|
|
NumElements = IList->getNumInits();
|
|
|
|
Result->reserveInits(NumElements);
|
|
|
|
// Link this new initializer list into the structured initializer
|
|
// lists.
|
|
if (StructuredList)
|
|
StructuredList->updateInit(StructuredIndex, Result);
|
|
else {
|
|
Result->setSyntacticForm(IList);
|
|
SyntacticToSemantic[IList] = Result;
|
|
}
|
|
|
|
return Result;
|
|
}
|
|
|
|
/// Update the initializer at index @p StructuredIndex within the
|
|
/// structured initializer list to the value @p expr.
|
|
void InitListChecker::UpdateStructuredListElement(InitListExpr *StructuredList,
|
|
unsigned &StructuredIndex,
|
|
Expr *expr) {
|
|
// No structured initializer list to update
|
|
if (!StructuredList)
|
|
return;
|
|
|
|
if (Expr *PrevInit = StructuredList->updateInit(StructuredIndex, expr)) {
|
|
// This initializer overwrites a previous initializer. Warn.
|
|
SemaRef.Diag(expr->getSourceRange().getBegin(),
|
|
diag::warn_initializer_overrides)
|
|
<< expr->getSourceRange();
|
|
SemaRef.Diag(PrevInit->getSourceRange().getBegin(),
|
|
diag::note_previous_initializer)
|
|
<< /*FIXME:has side effects=*/0
|
|
<< PrevInit->getSourceRange();
|
|
}
|
|
|
|
++StructuredIndex;
|
|
}
|
|
|
|
/// Check that the given Index expression is a valid array designator
|
|
/// value. This is essentailly just a wrapper around
|
|
/// Expr::isIntegerConstantExpr that also checks for negative values
|
|
/// and produces a reasonable diagnostic if there is a
|
|
/// failure. Returns true if there was an error, false otherwise. If
|
|
/// everything went okay, Value will receive the value of the constant
|
|
/// expression.
|
|
static bool
|
|
CheckArrayDesignatorExpr(Sema &Self, Expr *Index, llvm::APSInt &Value) {
|
|
SourceLocation Loc = Index->getSourceRange().getBegin();
|
|
|
|
// Make sure this is an integer constant expression.
|
|
if (!Index->isIntegerConstantExpr(Value, Self.Context, &Loc))
|
|
return Self.Diag(Loc, diag::err_array_designator_nonconstant)
|
|
<< Index->getSourceRange();
|
|
|
|
// Make sure this constant expression is non-negative.
|
|
llvm::APSInt Zero(llvm::APSInt::getNullValue(Value.getBitWidth()),
|
|
Value.isUnsigned());
|
|
if (Value < Zero)
|
|
return Self.Diag(Loc, diag::err_array_designator_negative)
|
|
<< Value.toString(10) << Index->getSourceRange();
|
|
|
|
Value.setIsUnsigned(true);
|
|
return false;
|
|
}
|
|
|
|
Sema::OwningExprResult Sema::ActOnDesignatedInitializer(Designation &Desig,
|
|
SourceLocation Loc,
|
|
bool UsedColonSyntax,
|
|
OwningExprResult Init) {
|
|
typedef DesignatedInitExpr::Designator ASTDesignator;
|
|
|
|
bool Invalid = false;
|
|
llvm::SmallVector<ASTDesignator, 32> Designators;
|
|
llvm::SmallVector<Expr *, 32> InitExpressions;
|
|
|
|
// Build designators and check array designator expressions.
|
|
for (unsigned Idx = 0; Idx < Desig.getNumDesignators(); ++Idx) {
|
|
const Designator &D = Desig.getDesignator(Idx);
|
|
switch (D.getKind()) {
|
|
case Designator::FieldDesignator:
|
|
Designators.push_back(ASTDesignator(D.getField(), D.getDotLoc(),
|
|
D.getFieldLoc()));
|
|
break;
|
|
|
|
case Designator::ArrayDesignator: {
|
|
Expr *Index = static_cast<Expr *>(D.getArrayIndex());
|
|
llvm::APSInt IndexValue;
|
|
if (CheckArrayDesignatorExpr(*this, Index, IndexValue))
|
|
Invalid = true;
|
|
else {
|
|
Designators.push_back(ASTDesignator(InitExpressions.size(),
|
|
D.getLBracketLoc(),
|
|
D.getRBracketLoc()));
|
|
InitExpressions.push_back(Index);
|
|
}
|
|
break;
|
|
}
|
|
|
|
case Designator::ArrayRangeDesignator: {
|
|
Expr *StartIndex = static_cast<Expr *>(D.getArrayRangeStart());
|
|
Expr *EndIndex = static_cast<Expr *>(D.getArrayRangeEnd());
|
|
llvm::APSInt StartValue;
|
|
llvm::APSInt EndValue;
|
|
if (CheckArrayDesignatorExpr(*this, StartIndex, StartValue) ||
|
|
CheckArrayDesignatorExpr(*this, EndIndex, EndValue))
|
|
Invalid = true;
|
|
else {
|
|
// Make sure we're comparing values with the same bit width.
|
|
if (StartValue.getBitWidth() > EndValue.getBitWidth())
|
|
EndValue.extend(StartValue.getBitWidth());
|
|
else if (StartValue.getBitWidth() < EndValue.getBitWidth())
|
|
StartValue.extend(EndValue.getBitWidth());
|
|
|
|
if (EndValue < StartValue) {
|
|
Diag(D.getEllipsisLoc(), diag::err_array_designator_empty_range)
|
|
<< StartValue.toString(10) << EndValue.toString(10)
|
|
<< StartIndex->getSourceRange() << EndIndex->getSourceRange();
|
|
Invalid = true;
|
|
} else {
|
|
Designators.push_back(ASTDesignator(InitExpressions.size(),
|
|
D.getLBracketLoc(),
|
|
D.getEllipsisLoc(),
|
|
D.getRBracketLoc()));
|
|
InitExpressions.push_back(StartIndex);
|
|
InitExpressions.push_back(EndIndex);
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (Invalid || Init.isInvalid())
|
|
return ExprError();
|
|
|
|
// Clear out the expressions within the designation.
|
|
Desig.ClearExprs(*this);
|
|
|
|
DesignatedInitExpr *DIE
|
|
= DesignatedInitExpr::Create(Context, &Designators[0], Designators.size(),
|
|
&InitExpressions[0], InitExpressions.size(),
|
|
Loc, UsedColonSyntax,
|
|
static_cast<Expr *>(Init.release()));
|
|
return Owned(DIE);
|
|
}
|
|
|
|
bool Sema::CheckInitList(InitListExpr *&InitList, QualType &DeclType) {
|
|
InitListChecker CheckInitList(*this, InitList, DeclType);
|
|
if (!CheckInitList.HadError())
|
|
InitList = CheckInitList.getFullyStructuredList();
|
|
|
|
return CheckInitList.HadError();
|
|
}
|
|
|
|
/// \brief Diagnose any semantic errors with value-initialization of
|
|
/// the given type.
|
|
///
|
|
/// Value-initialization effectively zero-initializes any types
|
|
/// without user-declared constructors, and calls the default
|
|
/// constructor for a for any type that has a user-declared
|
|
/// constructor (C++ [dcl.init]p5). Value-initialization can fail when
|
|
/// a type with a user-declared constructor does not have an
|
|
/// accessible, non-deleted default constructor. In C, everything can
|
|
/// be value-initialized, which corresponds to C's notion of
|
|
/// initializing objects with static storage duration when no
|
|
/// initializer is provided for that object.
|
|
///
|
|
/// \returns true if there was an error, false otherwise.
|
|
bool Sema::CheckValueInitialization(QualType Type, SourceLocation Loc) {
|
|
// C++ [dcl.init]p5:
|
|
//
|
|
// To value-initialize an object of type T means:
|
|
|
|
// -- if T is an array type, then each element is value-initialized;
|
|
if (const ArrayType *AT = Context.getAsArrayType(Type))
|
|
return CheckValueInitialization(AT->getElementType(), Loc);
|
|
|
|
if (const RecordType *RT = Type->getAsRecordType()) {
|
|
if (CXXRecordDecl *ClassDecl = dyn_cast<CXXRecordDecl>(RT->getDecl())) {
|
|
// -- if T is a class type (clause 9) with a user-declared
|
|
// constructor (12.1), then the default constructor for T is
|
|
// called (and the initialization is ill-formed if T has no
|
|
// accessible default constructor);
|
|
if (ClassDecl->hasUserDeclaredConstructor())
|
|
// FIXME: Eventually, we'll need to put the constructor decl
|
|
// into the AST.
|
|
return PerformInitializationByConstructor(Type, 0, 0, Loc,
|
|
SourceRange(Loc),
|
|
DeclarationName(),
|
|
IK_Direct);
|
|
}
|
|
}
|
|
|
|
if (Type->isReferenceType()) {
|
|
// C++ [dcl.init]p5:
|
|
// [...] A program that calls for default-initialization or
|
|
// value-initialization of an entity of reference type is
|
|
// ill-formed. [...]
|
|
// FIXME: Once we have code that goes through this path, add an
|
|
// actual diagnostic :)
|
|
}
|
|
|
|
return false;
|
|
}
|