1 files changed, 44 insertions, 0 deletions
diff --git a/llvm/lib/Target/SystemZ/SystemZCallingConv.h b/llvm/lib/Target/SystemZ/SystemZCallingConv.h
index 71605ac1126..8b8146762b6 100644
--- a/llvm/lib/Target/SystemZ/SystemZCallingConv.h
+++ b/llvm/lib/Target/SystemZ/SystemZCallingConv.h
@@ -10,6 +10,9 @@
 #ifndef LLVM_LIB_TARGET_SYSTEMZ_SYSTEMZCALLINGCONV_H
 #define LLVM_LIB_TARGET_SYSTEMZ_SYSTEMZCALLINGCONV_H
 
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/CodeGen/CallingConvLower.h"
+
 namespace llvm {
 namespace SystemZ {
   const unsigned NumArgGPRs = 5;
@@ -18,6 +21,47 @@ namespace SystemZ {
   const unsigned NumArgFPRs = 4;
   extern const unsigned ArgFPRs[NumArgFPRs];
 } // end namespace SystemZ
+
+class SystemZCCState : public CCState {
+private:
+  /// Records whether the value was a fixed argument.
+  /// See ISD::OutputArg::IsFixed.
+  SmallVector<bool, 4> ArgIsFixed;
+
+public:
+  SystemZCCState(CallingConv::ID CC, bool isVarArg, MachineFunction &MF,
+                 SmallVectorImpl<CCValAssign> &locs, LLVMContext &C)
+      : CCState(CC, isVarArg, MF, locs, C) {}
+
+  void AnalyzeFormalArguments(const SmallVectorImpl<ISD::InputArg> &Ins,
+                              CCAssignFn Fn) {
+    // Formal arguments are always fixed.
+    ArgIsFixed.clear();
+    for (unsigned i = 0; i < Ins.size(); ++i)
+      ArgIsFixed.push_back(true);
+
+    CCState::AnalyzeFormalArguments(Ins, Fn);
+  }
+
+  void AnalyzeCallOperands(const SmallVectorImpl<ISD::OutputArg> &Outs,
+                           CCAssignFn Fn) {
+    // Record whether the call operand was a fixed argument.
+    ArgIsFixed.clear();
+    for (unsigned i = 0; i < Outs.size(); ++i)
+      ArgIsFixed.push_back(Outs[i].IsFixed);
+
+    CCState::AnalyzeCallOperands(Outs, Fn);
+  }
+
+  // This version of AnalyzeCallOperands in the base class is not usable
+  // since we must provide a means of accessing ISD::OutputArg::IsFixed.
+  void AnalyzeCallOperands(const SmallVectorImpl<MVT> &Outs,
+                           SmallVectorImpl<ISD::ArgFlagsTy> &Flags,
+                           CCAssignFn Fn) = delete;
+
+  bool IsFixed(unsigned ValNo) { return ArgIsFixed[ValNo]; }
+};
+
 } // end namespace llvm
 
 #endif