[tablegen] !strconcat accepts more than two arguments but this wasn't documented or tested.

Summary:
* Updated the documentation
* Added a test for >2 arguments
* Added a check for the lexical concatenation
* Made the existing test a bit stricter.

Reviewers: t.p.northover

Reviewed By: t.p.northover

Subscribers: t.p.northover, llvm-commits

Differential Revision: http://reviews.llvm.org/D3485

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207865 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 13 insertions, 1 deletions

diff --git a/test/TableGen/strconcat.td b/test/TableGen/strconcat.td
index dfb1a94d82..f5d7512fd6 100644
--- a/test/TableGen/strconcat.td
+++ b/test/TableGen/strconcat.td
@@ -1,9 +1,21 @@
 // RUN: llvm-tblgen %s | FileCheck %s
 
-// CHECK: fufoo
+// CHECK: class Y<string Y:S = ?> {
+// CHECK:   string T = !strconcat(Y:S, "foo");
+// CHECK:   string T2 = !strconcat(Y:S, !strconcat("foo", !strconcat(Y:S, "bar")));
+// CHECK:   string S = "foobar";
+// CHECK: }
+
+// CHECK: def Z {
+// CHECK:   string T = "fufoo";
+// CHECK:   string T2 = "fufoofubar";
+// CHECK:   string S = "foobar";
+// CHECK: }
 
 class Y<string S> {
   string T = !strconcat(S, "foo");
+  // More than two arguments is equivalent to nested calls
+  string T2 = !strconcat(S, "foo", S, "bar");
 
   // String values concatenate lexically, as in C.
   string S = "foo" "bar";