Patch to issue error when target of MacOS and iOS
does not support large load/store of atomic objects.
// rdar://13973577
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@182781 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/AST/ASTContext.cpp b/lib/AST/ASTContext.cpp
index f5e4b42..946d3df 100644
--- a/lib/AST/ASTContext.cpp
+++ b/lib/AST/ASTContext.cpp
@@ -8030,3 +8030,17 @@
"ParmIndices lacks entry set by ParmVarDecl");
return I->second;
}
+
+bool ASTContext::AtomicUsesUnsupportedLibcall(const AtomicExpr *E) const {
+ const llvm::Triple &T = getTargetInfo().getTriple();
+ if (!T.isOSDarwin())
+ return false;
+
+ QualType AtomicTy = E->getPtr()->getType()->getPointeeType();
+ CharUnits sizeChars = getTypeSizeInChars(AtomicTy);
+ uint64_t Size = sizeChars.getQuantity();
+ CharUnits alignChars = getTypeAlignInChars(AtomicTy);
+ unsigned Align = alignChars.getQuantity();
+ unsigned MaxInlineWidthInBits = getTargetInfo().getMaxAtomicInlineWidth();
+ return (Size != Align || toBits(sizeChars) > MaxInlineWidthInBits);
+}
diff --git a/lib/Sema/SemaChecking.cpp b/lib/Sema/SemaChecking.cpp
index cdc546c..da24667 100644
--- a/lib/Sema/SemaChecking.cpp
+++ b/lib/Sema/SemaChecking.cpp
@@ -908,10 +908,18 @@
SubExprs.push_back(TheCall->getArg(3)); // Weak
break;
}
+
+ AtomicExpr *AE = new (Context) AtomicExpr(TheCall->getCallee()->getLocStart(),
+ SubExprs, ResultType, Op,
+ TheCall->getRParenLoc());
+
+ if ((Op == AtomicExpr::AO__c11_atomic_load ||
+ (Op == AtomicExpr::AO__c11_atomic_store)) &&
+ Context.AtomicUsesUnsupportedLibcall(AE))
+ Diag(AE->getLocStart(), diag::err_atomic_load_store_uses_lib) <<
+ ((Op == AtomicExpr::AO__c11_atomic_load) ? 0 : 1);
- return Owned(new (Context) AtomicExpr(TheCall->getCallee()->getLocStart(),
- SubExprs, ResultType, Op,
- TheCall->getRParenLoc()));
+ return Owned(AE);
}