Implement ARM GNU-style interrupt attribute
This attribute allows users to use a modified C or C++ function as an ARM
exception-handling function and, with care, to successfully return control to
user-space after the issue has been dealt with.
rdar://problem/14207019
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@191769 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/TargetAttributesSema.cpp b/lib/Sema/TargetAttributesSema.cpp
index 7db0b24..45067de 100644
--- a/lib/Sema/TargetAttributesSema.cpp
+++ b/lib/Sema/TargetAttributesSema.cpp
@@ -26,6 +26,50 @@
return false;
}
+static void HandleARMInterruptAttr(Decl *d,
+ const AttributeList &Attr, Sema &S) {
+ // Check the attribute arguments.
+ if (Attr.getNumArgs() > 1) {
+ S.Diag(Attr.getLoc(), diag::err_attribute_too_many_arguments)
+ << 1;
+ return;
+ }
+
+ StringRef Str;
+ SourceLocation ArgLoc;
+
+ if (Attr.getNumArgs() == 0)
+ Str = "";
+ else if (!S.checkStringLiteralArgumentAttr(Attr, 0, Str, &ArgLoc))
+ return;
+
+ ARMInterruptAttr::InterruptType Kind;
+ if (!ARMInterruptAttr::ConvertStrToInterruptType(Str, Kind)) {
+ S.Diag(Attr.getLoc(), diag::warn_attribute_type_not_supported)
+ << Attr.getName() << Str << ArgLoc;
+ return;
+ }
+
+ unsigned Index = Attr.getAttributeSpellingListIndex();
+ d->addAttr(::new (S.Context)
+ ARMInterruptAttr(Attr.getLoc(), S.Context, Kind, Index));
+}
+
+namespace {
+ class ARMAttributesSema : public TargetAttributesSema {
+ public:
+ ARMAttributesSema() { }
+ bool ProcessDeclAttribute(Scope *scope, Decl *D,
+ const AttributeList &Attr, Sema &S) const {
+ if (Attr.getName()->getName() == "interrupt") {
+ HandleARMInterruptAttr(D, Attr, S);
+ return true;
+ }
+ return false;
+ }
+ };
+}
+
static void HandleMSP430InterruptAttr(Decl *d,
const AttributeList &Attr, Sema &S) {
// Check the attribute arguments.
@@ -292,6 +336,9 @@
const llvm::Triple &Triple(Context.getTargetInfo().getTriple());
switch (Triple.getArch()) {
+ case llvm::Triple::arm:
+ case llvm::Triple::thumb:
+ return *(TheTargetAttributesSema = new ARMAttributesSema);
case llvm::Triple::msp430:
return *(TheTargetAttributesSema = new MSP430AttributesSema);
case llvm::Triple::x86: