Merge pull request #838 from cpunion/unsafe-fix

fix unsafe

ssa/datastruct.go

@@ -124,7 +124,9 @@ func (b Builder) SliceData(x Expr) Expr {
 		log.Printf("SliceData %v\n", x.impl)
 	}
 	ptr := llvm.CreateExtractValue(b.impl, x.impl, 0)
-	return Expr{ptr, b.Prog.VoidPtr()}
+	ty := x.Type.RawType()
+	tySlice := ty.Underlying().(*types.Slice)
+	return Expr{ptr, b.Prog.Pointer(b.Prog.rawType(tySlice.Elem()))}
 }
 
 // SliceLen returns the length of a slice.

ssa/expr.go

@@ -1182,6 +1182,8 @@ func (b Builder) BuiltinCall(fn string, args ...Expr) (ret Expr) {
 		if len(args) > 0 {
 			return b.compareSelect(token.GTR, args[0], args[1:]...)
 		}
+	case "Add":
+		return b.Advance(args[0], args[1])
 	}
 	panic("todo: " + fn)
 }