[FileCheck] Annotate input dump (7/7)

This patch implements annotations for diagnostics reporting CHECK-NOT
failed matches.  These diagnostics are enabled by -vv.  As for
diagnostics reporting failed matches for other directives, these
annotations mark the search ranges using `X~~`.  The difference here
is that failed matches for CHECK-NOT are successes not errors, so they
are green not red when colors are enabled.

For example:

```
$ FileCheck -dump-input=help
The following description was requested by -dump-input=help to
explain the input annotations printed by -dump-input=always and
-dump-input=fail:

  - L:     labels line number L of the input file
  - T:L    labels the only match result for a pattern of type T from line L of
           the check file
  - T:L'N  labels the Nth match result for a pattern of type T from line L of
           the check file
  - ^~~    marks good match (reported if -v)
  - !~~    marks bad match, such as:
           - CHECK-NEXT on same line as previous match (error)
           - CHECK-NOT found (error)
           - CHECK-DAG overlapping match (discarded, reported if -vv)
  - X~~    marks search range when no match is found, such as:
           - CHECK-NEXT not found (error)
           - CHECK-NOT not found (success, reported if -vv)
           - CHECK-DAG not found after discarded matches (error)
  - ?      marks fuzzy match when no match is found
  - colors success, error, fuzzy match, discarded match, unmatched input

If you are not seeing color above or in input dumps, try: -color

$ FileCheck -vv -dump-input=always check5 < input5 |& sed -n '/^<<<</,$p'
<<<<<<
         1: abcdef
check:1     ^~~
not:2          X~~
         2: ghijkl
not:2       ~~~
check:3        ^~~
         3: mnopqr
not:4       X~~~~~
         4: stuvwx
not:4       ~~~~~~
         5:
eof:4       ^
>>>>>>

$ cat check5
CHECK: abc
CHECK-NOT: foobar
CHECK: jkl
CHECK-NOT: foobar

$ cat input5
abcdef
ghijkl
mnopqr
stuvwx
```

Reviewed By: george.karpenkov, probinson

Differential Revision: https://reviews.llvm.org/D53899

llvm-svn: 349424

1 files changed, 3 insertions, 2 deletions

diff --git a/llvm/utils/FileCheck/FileCheck.cpp b/llvm/utils/FileCheck/FileCheck.cpp
index cde9bb95706..6f4cf31ec83 100644
--- a/llvm/utils/FileCheck/FileCheck.cpp
+++ b/llvm/utils/FileCheck/FileCheck.cpp
@@ -153,12 +153,12 @@ static MarkerStyle GetMarker(FileCheckDiag::MatchType MatchTy) {
   case FileCheckDiag::MatchDiscard:
     return MarkerStyle('!', raw_ostream::CYAN,
                        "discard: overlaps earlier match");
+  case FileCheckDiag::MatchNoneAndExcluded:
+    return MarkerStyle('X', raw_ostream::GREEN);
   case FileCheckDiag::MatchNoneButExpected:
     return MarkerStyle('X', raw_ostream::RED, "error: no match found");
   case FileCheckDiag::MatchFuzzy:
     return MarkerStyle('?', raw_ostream::MAGENTA, "possible intended match");
-  case FileCheckDiag::MatchTypeCount:
-    llvm_unreachable_internal("unexpected match type");
   }
   llvm_unreachable_internal("unexpected match type");
 }
@@ -200,6 +200,7 @@ static void DumpInputAnnotationHelp(raw_ostream &OS) {
   WithColor(OS, raw_ostream::SAVEDCOLOR, true) << "X~~";
   OS << "    marks search range when no match is found, such as:\n"
      << "           - CHECK-NEXT not found (error)\n"
+     << "           - CHECK-NOT not found (success, reported if -vv)\n"
      << "           - CHECK-DAG not found after discarded matches (error)\n"
      << "  - ";
   WithColor(OS, raw_ostream::SAVEDCOLOR, true) << "?";