From: Arnold Schwaighofer <aschwaighofer@apple.com>
Date: Thu, 1 Dec 2016 18:07:38 +0000 (+0000)
Subject: swiftcc: Add an api to query whether a target ABI stores swifterror in a register
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=5af66e97a414a1975bd277905c4b98fe74a345ce;p=clang

swiftcc: Add an api to query whether a target ABI stores swifterror in a register

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@288394 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/include/clang/CodeGen/SwiftCallingConv.h b/include/clang/CodeGen/SwiftCallingConv.h
index dd0ae2f1d6..23db43e673 100644
--- a/include/clang/CodeGen/SwiftCallingConv.h
+++ b/include/clang/CodeGen/SwiftCallingConv.h
@@ -160,6 +160,9 @@ ABIArgInfo classifyArgumentType(CodeGenModule &CGM, CanQualType type);
 /// private interface for Clang.
 void computeABIInfo(CodeGenModule &CGM, CGFunctionInfo &FI);
 
+/// Is swifterror lowered to a register by the target ABI.
+bool isSwiftErrorLoweredInRegister(CodeGenModule &CGM);
+
 } // end namespace swiftcall
 } // end namespace CodeGen
 } // end namespace clang
diff --git a/lib/CodeGen/ABIInfo.h b/lib/CodeGen/ABIInfo.h
index 530a7ef560..ac31dfdaf3 100644
--- a/lib/CodeGen/ABIInfo.h
+++ b/lib/CodeGen/ABIInfo.h
@@ -142,6 +142,8 @@ namespace swiftcall {
                                            llvm::Type *eltTy,
                                            unsigned elts) const;
 
+    virtual bool isSwiftErrorInRegister() const = 0;
+
     static bool classof(const ABIInfo *info) {
       return info->supportsSwift();
     }
diff --git a/lib/CodeGen/SwiftCallingConv.cpp b/lib/CodeGen/SwiftCallingConv.cpp
index 1629c44365..0bfe30a32c 100644
--- a/lib/CodeGen/SwiftCallingConv.cpp
+++ b/lib/CodeGen/SwiftCallingConv.cpp
@@ -828,3 +828,8 @@ void swiftcall::computeABIInfo(CodeGenModule &CGM, CGFunctionInfo &FI) {
     argInfo.info = classifyArgumentType(CGM, argInfo.type);
   }
 }
+
+// Is swifterror lowered to a register by the target ABI.
+bool swiftcall::isSwiftErrorLoweredInRegister(CodeGenModule &CGM) {
+  return getSwiftABIInfo(CGM).isSwiftErrorInRegister();
+}
diff --git a/lib/CodeGen/TargetInfo.cpp b/lib/CodeGen/TargetInfo.cpp
index caac27b965..e4f7d99bef 100644
--- a/lib/CodeGen/TargetInfo.cpp
+++ b/lib/CodeGen/TargetInfo.cpp
@@ -958,6 +958,11 @@ public:
     // scalar registers.
     return occupiesMoreThan(CGT, scalars, /*total*/ 3);
   }  
+
+  bool isSwiftErrorInRegister() const override {
+    // x86-32 lowering does not support passing swifterror in a register.
+    return false;
+  }
 };
 
 class X86_32TargetCodeGenInfo : public TargetCodeGenInfo {
@@ -2012,6 +2017,9 @@ public:
                                     bool asReturnValue) const override {
     return occupiesMoreThan(CGT, scalars, /*total*/ 4);
   }  
+  bool isSwiftErrorInRegister() const override {
+    return true;
+  }
 };
 
 /// WinX86_64ABIInfo - The Windows X86_64 ABI information.
@@ -2043,6 +2051,10 @@ public:
     return occupiesMoreThan(CGT, scalars, /*total*/ 4);
   }
 
+  bool isSwiftErrorInRegister() const override {
+    return true;
+  }
+
 private:
   ABIArgInfo classify(QualType Ty, unsigned &FreeSSERegs,
                       bool IsReturnType) const;
@@ -4628,6 +4640,9 @@ private:
                                     bool asReturnValue) const override {
     return occupiesMoreThan(CGT, scalars, /*total*/ 4);
   }
+  bool isSwiftErrorInRegister() const override {
+    return true;
+  }
 };
 
 class AArch64TargetCodeGenInfo : public TargetCodeGenInfo {
@@ -5181,6 +5196,9 @@ private:
                                     bool asReturnValue) const override {
     return occupiesMoreThan(CGT, scalars, /*total*/ 4);
   }
+  bool isSwiftErrorInRegister() const override {
+    return true;
+  }
 };
 
 class ARMTargetCodeGenInfo : public TargetCodeGenInfo {
@@ -5949,6 +5967,9 @@ public:
                                     bool asReturnValue) const override {
     return occupiesMoreThan(CGT, scalars, /*total*/ 4);
   }
+  bool isSwiftErrorInRegister() const override {
+    return true;
+  }
 };
 
 class SystemZTargetCodeGenInfo : public TargetCodeGenInfo {