Fix the mono calling convention on arm64+linux.

vargaz · lewurm · commit 37e14bd72e6c · 2018-11-08T07:12:42.000+01:00
diff --git a/lib/Target/AArch64/AArch64CallingConvention.td b/lib/Target/AArch64/AArch64CallingConvention.td
@@ -262,3 +262,12 @@ def CC_AArch64_Mono_DarwinPCS : CallingConv<[
 
   CCDelegateTo<CC_AArch64_DarwinPCS>
 ]>;
+
+def CC_AArch64_Mono_AAPCS : CallingConv<[
+
+  // Mono marks the parameter it wants to pass in this non-abi register with
+  // the 'inreg' attribute.
+  CCIfInReg<CCAssignToReg<[X15]>>,
+
+  CCDelegateTo<CC_AArch64_AAPCS>
+]>;
diff --git a/lib/Target/AArch64/AArch64ISelLowering.cpp b/lib/Target/AArch64/AArch64ISelLowering.cpp
@@ -1796,7 +1796,12 @@ CCAssignFn *AArch64TargetLowering::CCAssignFnForCall(CallingConv::ID CC,
       return CC_AArch64_AAPCS;
     return IsVarArg ? CC_AArch64_DarwinPCS_VarArg : CC_AArch64_DarwinPCS;
   case CallingConv::Mono:
-    return CC_AArch64_Mono_DarwinPCS;
+      if (Subtarget->isTargetDarwin())
+          return CC_AArch64_Mono_DarwinPCS;
+      else if (Subtarget->isTargetWindows())
+          report_fatal_error("Unsupported calling convention.");
+      else
+          return CC_AArch64_Mono_AAPCS;
   }
 }
 

Original file line number	Diff line number	Diff line change
`@@ -1796,7 +1796,12 @@ CCAssignFn *AArch64TargetLowering::CCAssignFnForCall(CallingConv::ID CC,`
`1796`	`1796`	`return CC_AArch64_AAPCS;`
`1797`	`1797`	`return IsVarArg ? CC_AArch64_DarwinPCS_VarArg : CC_AArch64_DarwinPCS;`
`1798`	`1798`	`case CallingConv::Mono:`
`1799`		`- return CC_AArch64_Mono_DarwinPCS;`
	`1799`	`+ if (Subtarget->isTargetDarwin())`
	`1800`	`+ return CC_AArch64_Mono_DarwinPCS;`
	`1801`	`+ else if (Subtarget->isTargetWindows())`
	`1802`	`+ report_fatal_error("Unsupported calling convention.");`
	`1803`	`+ else`
	`1804`	`+ return CC_AArch64_Mono_AAPCS;`
`1800`	`1805`	`}`
`1801`	`1806`	`}`
`1802`	`1807`