Add support for "type safety" attributes that allow checking that 'void *'
function arguments and arguments for variadic functions are of a particular
type which is determined by some other argument to the same function call.
Usecases include:
* MPI library implementations, where these attributes enable checking that
buffer type matches the passed MPI_Datatype;
* for HDF5 library there is a similar usecase as MPI;
* checking types of variadic functions' arguments for functions like
fcntl() and ioctl().
llvm-svn: 162067
diff --git a/clang/lib/Sema/SemaDecl.cpp b/clang/lib/Sema/SemaDecl.cpp
index 01b2f2c..75b8095 100644
--- a/clang/lib/Sema/SemaDecl.cpp
+++ b/clang/lib/Sema/SemaDecl.cpp
@@ -7031,6 +7031,42 @@
Sema::FinalizeDeclaration(Decl *ThisDecl) {
// Note that we are no longer parsing the initializer for this declaration.
ParsingInitForAutoVars.erase(ThisDecl);
+
+ // Now we have parsed the initializer and can update the table of magic
+ // tag values.
+ if (ThisDecl && ThisDecl->hasAttr<TypeTagForDatatypeAttr>()) {
+ const VarDecl *VD = dyn_cast<VarDecl>(ThisDecl);
+ if (VD && VD->getType()->isIntegralOrEnumerationType()) {
+ for (specific_attr_iterator<TypeTagForDatatypeAttr>
+ I = ThisDecl->specific_attr_begin<TypeTagForDatatypeAttr>(),
+ E = ThisDecl->specific_attr_end<TypeTagForDatatypeAttr>();
+ I != E; ++I) {
+ const Expr *MagicValueExpr = VD->getInit();
+ if (!MagicValueExpr) {
+ continue;
+ }
+ llvm::APSInt MagicValueInt;
+ if (!MagicValueExpr->isIntegerConstantExpr(MagicValueInt, Context)) {
+ Diag(I->getRange().getBegin(),
+ diag::err_type_tag_for_datatype_not_ice)
+ << LangOpts.CPlusPlus << MagicValueExpr->getSourceRange();
+ continue;
+ }
+ if (MagicValueInt.getActiveBits() > 64) {
+ Diag(I->getRange().getBegin(),
+ diag::err_type_tag_for_datatype_too_large)
+ << LangOpts.CPlusPlus << MagicValueExpr->getSourceRange();
+ continue;
+ }
+ uint64_t MagicValue = MagicValueInt.getZExtValue();
+ RegisterTypeTagForDatatype(I->getArgumentKind(),
+ MagicValue,
+ I->getMatchingCType(),
+ I->getLayoutCompatible(),
+ I->getMustBeNull());
+ }
+ }
+ }
}
Sema::DeclGroupPtrTy