Add support for __attribute__((hot)) and __attribute__((cold)).
Currently cold functions are marked with the "optsize" attribute in CodeGen
so they are always optimized for size. The hot attribute is just ignored,
LLVM doesn't have a way to express hotness at the moment.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@156723 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/SemaDeclAttr.cpp b/lib/Sema/SemaDeclAttr.cpp
index de0e2d9..7c290f7 100644
--- a/lib/Sema/SemaDeclAttr.cpp
+++ b/lib/Sema/SemaDeclAttr.cpp
@@ -1294,6 +1294,46 @@
Str->getString()));
}
+static void handleColdAttr(Sema &S, Decl *D, const AttributeList &Attr) {
+ // Check the attribute arguments.
+ if (!checkAttributeNumArgs(S, Attr, 0))
+ return;
+
+ if (!isa<FunctionDecl>(D)) {
+ S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
+ << Attr.getName() << ExpectedFunction;
+ return;
+ }
+
+ if (D->hasAttr<HotAttr>()) {
+ S.Diag(Attr.getLoc(), diag::err_attributes_are_not_compatible)
+ << Attr.getName() << "hot";
+ return;
+ }
+
+ D->addAttr(::new (S.Context) ColdAttr(Attr.getRange(), S.Context));
+}
+
+static void handleHotAttr(Sema &S, Decl *D, const AttributeList &Attr) {
+ // Check the attribute arguments.
+ if (!checkAttributeNumArgs(S, Attr, 0))
+ return;
+
+ if (!isa<FunctionDecl>(D)) {
+ S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
+ << Attr.getName() << ExpectedFunction;
+ return;
+ }
+
+ if (D->hasAttr<ColdAttr>()) {
+ S.Diag(Attr.getLoc(), diag::err_attributes_are_not_compatible)
+ << Attr.getName() << "cold";
+ return;
+ }
+
+ D->addAttr(::new (S.Context) HotAttr(Attr.getRange(), S.Context));
+}
+
static void handleNakedAttr(Sema &S, Decl *D, const AttributeList &Attr) {
// Check the attribute arguments.
if (!checkAttributeNumArgs(S, Attr, 0))
@@ -3825,6 +3865,8 @@
case AttributeList::AT_ownership_takes:
case AttributeList::AT_ownership_holds:
handleOwnershipAttr (S, D, Attr); break;
+ case AttributeList::AT_cold: handleColdAttr (S, D, Attr); break;
+ case AttributeList::AT_hot: handleHotAttr (S, D, Attr); break;
case AttributeList::AT_naked: handleNakedAttr (S, D, Attr); break;
case AttributeList::AT_noreturn: handleNoReturnAttr (S, D, Attr); break;
case AttributeList::AT_nothrow: handleNothrowAttr (S, D, Attr); break;