FileCheck: Document CHECK-SAME, follow-up to r230612

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@231379 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/docs/CommandGuide/FileCheck.rst b/docs/CommandGuide/FileCheck.rst
index af01503792e85da4cd0699737fa77a423b4f78af..72db660fb5ef97eb1a343b761050058089bf5a27 100644 (file)
--- a/docs/CommandGuide/FileCheck.rst
+++ b/docs/CommandGuide/FileCheck.rst
@@ -185,6 +185,31 @@ For example, something like this works as you'd expect:
 newline between it and the previous directive.  A "``CHECK-NEXT:``" cannot be
 the first directive in a file.
 
+The "CHECK-SAME:" directive
+~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Sometimes you want to match lines and would like to verify that matches happen
+on the same line as the previous match.  In this case, you can use "``CHECK:``"
+and "``CHECK-SAME:``" directives to specify this.  If you specified a custom
+check prefix, just use "``<PREFIX>-SAME:``".
+
+"``CHECK-SAME:``" is particularly powerful in conjunction with "``CHECK-NOT:``"
+(described below).
+
+For example, the following works like you'd expect:
+
+.. code-block:: llvm
+
+   !0 = !MDLocation(line: 5, scope: !1, inlinedAt: !2)
+
+   ; CHECK:       !MDLocation(line: 5,
+   ; CHECK-NOT:               column:
+   ; CHECK-SAME:              scope: ![[SCOPE:[0-9]+]]
+
+"``CHECK-SAME:``" directives reject the input if there are any newlines between
+it and the previous directive.  A "``CHECK-SAME:``" cannot be the first
+directive in a file.
+
 The "CHECK-NOT:" directive
 ~~~~~~~~~~~~~~~~~~~~~~~~~~