Allowing individual targets to determine whether a given calling convention is allowed or ignored with warning. This allows for correct name mangling for x64 targets on Windows, which in turn allows for linking against the Win32 APIs.

Fixes PR13782

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@165015 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 26 insertions, 0 deletions

diff --git a/lib/Basic/Targets.cpp b/lib/Basic/Targets.cpp
index 201913774c..6469c46574 100644
--- a/lib/Basic/Targets.cpp
+++ b/lib/Basic/Targets.cpp
@@ -1673,6 +1673,19 @@ public:
     }
     llvm_unreachable("Unhandled CPU kind");
   }
+
+  virtual CallingConvCheckResult checkCallingConvention(CallingConv CC) const {
+    // We accept all non-ARM calling conventions
+    return (CC == CC_X86ThisCall ||
+            CC == CC_X86FastCall ||
+            CC == CC_X86StdCall || 
+            CC == CC_C || 
+            CC == CC_X86Pascal) ? CCCR_OK : CCCR_Warning;
+  }
+
+  virtual CallingConv getDefaultCallingConv() const {
+    return CC_C;
+  }
 };
 
 void X86TargetInfo::getDefaultFeatures(llvm::StringMap<bool> &Features) const {
@@ -2708,6 +2721,15 @@ public:
     if (RegNo == 1) return 1;
     return -1;
   }
+
+  virtual CallingConvCheckResult checkCallingConvention(CallingConv CC) const {
+    return TargetInfo::checkCallingConvention(CC);
+  }
+
+  virtual CallingConv getDefaultCallingConv() const {
+    return CC_Default;
+  }
+
 };
 } // end anonymous namespace
 
@@ -3167,6 +3189,10 @@ public:
     // FIXME: Is this really right?
     return "";
   }
+
+  virtual CallingConvCheckResult checkCallingConvention(CallingConv CC) const {
+    return (CC == CC_AAPCS || CC == CC_AAPCS_VFP) ? CCCR_OK : CCCR_Warning;
+  }
 };
 
 const char * const ARMTargetInfo::GCCRegNames[] = {