[PATCH] D46550: Support Swift calling convention for PPC64 targets

[Bob Wilson via Phabricator via cfe-commits]

bob.wilson created this revision.
bob.wilson added a reviewer: aschwaighofer.
Herald added subscribers: kbarton, nemanjai, mcrosier.

This adds basic support for the Swift calling convention with PPC64 targets.
Patch provided by Atul Sowani in bug report #37223


Repository:
  rC Clang

https://reviews.llvm.org/D46550

Files:
  lib/Basic/Targets/PPC.h
  lib/CodeGen/TargetInfo.cpp


Index: lib/CodeGen/TargetInfo.cpp
===================================================================
--- lib/CodeGen/TargetInfo.cpp
+++ lib/CodeGen/TargetInfo.cpp
@@ -4287,7 +4287,7 @@
 
 namespace {
 /// PPC64_SVR4_ABIInfo - The 64-bit PowerPC ELF (SVR4) ABI information.
-class PPC64_SVR4_ABIInfo : public ABIInfo {
+class PPC64_SVR4_ABIInfo : public SwiftABIInfo {
 public:
   enum ABIKind {
     ELFv1 = 0,
@@ -4331,7 +4331,7 @@
 public:
   PPC64_SVR4_ABIInfo(CodeGen::CodeGenTypes &CGT, ABIKind Kind, bool HasQPX,
                      bool SoftFloatABI)
-      : ABIInfo(CGT), Kind(Kind), HasQPX(HasQPX),
+      : SwiftABIInfo(CGT), Kind(Kind), HasQPX(HasQPX),
         IsSoftFloatABI(SoftFloatABI) {}
 
   bool isPromotableTypeForABI(QualType Ty) const;
@@ -4374,6 +4374,15 @@
 
   Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
                     QualType Ty) const override;
+
+  bool shouldPassIndirectlyForSwift(ArrayRef<llvm::Type*> scalars,
+                                    bool asReturnValue) const override {
+    return occupiesMoreThan(CGT, scalars, /*total*/ 4);
+  }
+
+  bool isSwiftErrorInRegister() const override {
+    return false;
+  }
 };
 
 class PPC64_SVR4_TargetCodeGenInfo : public TargetCodeGenInfo {
Index: lib/Basic/Targets/PPC.h
===================================================================
--- lib/Basic/Targets/PPC.h
+++ lib/Basic/Targets/PPC.h
@@ -335,6 +335,15 @@
     }
     return false;
   }
+
+  CallingConvCheckResult checkCallingConvention(CallingConv CC) const override {
+    switch (CC) {
+    case CC_Swift:
+      return CCCR_OK;
+    default:
+      return CCCR_Warning;
+    }
+  }
 };
 
 class LLVM_LIBRARY_VISIBILITY DarwinPPC32TargetInfo


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