[RISCV] Add support for interrupt attribute
Summary:
Clang supports the GNU style ``__attribute__((interrupt))`` attribute on RISCV targets.
Permissible values for this parameter are user, supervisor, and machine.
If there is no parameter, then it defaults to machine.
Reference: https://gcc.gnu.org/onlinedocs/gcc/RISC-V-Function-Attributes.html
Based on initial patch by Zhaoshi Zheng.
Reviewers: asb, aaron.ballman
Reviewed By: asb, aaron.ballman
Subscribers: rkruppe, the_o, aaron.ballman, MartinMosbeck, brucehoult, rbar, johnrusso, simoncook, sabuasal, niosHD, kito-cheng, shiva0217, zzheng, edward-jones, mgrang, rogfer01, cfe-commits
Differential Revision: https://reviews.llvm.org/D48412
llvm-svn: 338045
diff --git a/clang/lib/CodeGen/TargetInfo.cpp b/clang/lib/CodeGen/TargetInfo.cpp
index 2078ea1..fa9b0a2 100644
--- a/clang/lib/CodeGen/TargetInfo.cpp
+++ b/clang/lib/CodeGen/TargetInfo.cpp
@@ -8971,6 +8971,27 @@
public:
RISCVTargetCodeGenInfo(CodeGen::CodeGenTypes &CGT, unsigned XLen)
: TargetCodeGenInfo(new RISCVABIInfo(CGT, XLen)) {}
+
+ void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV,
+ CodeGen::CodeGenModule &CGM) const override {
+ const auto *FD = dyn_cast_or_null<FunctionDecl>(D);
+ if (!FD) return;
+
+ const auto *Attr = FD->getAttr<RISCVInterruptAttr>();
+ if (!Attr)
+ return;
+
+ const char *Kind;
+ switch (Attr->getInterrupt()) {
+ case RISCVInterruptAttr::user: Kind = "user"; break;
+ case RISCVInterruptAttr::supervisor: Kind = "supervisor"; break;
+ case RISCVInterruptAttr::machine: Kind = "machine"; break;
+ }
+
+ auto *Fn = cast<llvm::Function>(GV);
+
+ Fn->addFnAttr("interrupt", Kind);
+ }
};
} // namespace