From 001f83a296a53aefc9d7395148a2eb8eca9ab479 Mon Sep 17 00:00:00 2001
From: Frits van Bommel <fvbommel@wxs.nl>
Date: Thu, 26 Feb 2009 15:23:52 +0100
Subject: [PATCH] Don't crash if we don't know what ABI to use. Assume some
 defaults instead.

---
 gen/abi.cpp | 31 ++++++++++++++++++++++++++++++-
 1 file changed, 30 insertions(+), 1 deletion(-)

diff --git a/gen/abi.cpp b/gen/abi.cpp
index 5bb09323..d62ebcd9 100644
--- a/gen/abi.cpp
+++ b/gen/abi.cpp
@@ -6,6 +6,7 @@
 #include "gen/llvmhelpers.h"
 #include "gen/tollvm.h"
 #include "gen/abi.h"
+#include "gen/logger.h"
 
 //////////////////////////////////////////////////////////////////////////////
 //////////////////////////////////////////////////////////////////////////////
@@ -205,6 +206,33 @@ struct X86_64TargetABI : TargetABI
     }
 };
 
+//////////////////////////////////////////////////////////////////////////////
+//////////////////////////////////////////////////////////////////////////////
+///////////////////         Unknown targets         //////////////////////////
+//////////////////////////////////////////////////////////////////////////////
+//////////////////////////////////////////////////////////////////////////////
+
+// Some reasonable defaults for when we don't know what ABI to use.
+struct UnknownTargetABI : TargetABI
+{
+    UnknownTargetABI()
+    {
+        // Don't push anything into retOps, assume defaults will be fine.
+    }
+
+    bool returnInArg(Type* t)
+    {
+        Type* rt = t->toBasetype();
+        return (rt->ty == Tstruct);
+    }
+
+    bool passByRef(Type* t)
+    {
+        t = t->toBasetype();
+        return (t->ty == Tstruct || t->ty == Tsarray);
+    }
+};
+
 //////////////////////////////////////////////////////////////////////////////
 //////////////////////////////////////////////////////////////////////////////
 //////////////////////////////////////////////////////////////////////////////
@@ -220,6 +248,7 @@ TargetABI * TargetABI::getTarget()
     case ARCHx86_64:
         return new X86_64TargetABI;
     default:
-        return NULL;
+        Logger::cout() << "WARNING: Unknown ABI, guessing...\n";
+        return new UnknownTargetABI;
     }
 }