[FileCheck] Annotate input dump (4/7)

This patch implements input annotations for diagnostics that report
unexpected matches for CHECK-NOT.  Like wrong-line matches for
CHECK-NEXT, CHECK-SAME, and CHECK-EMPTY, these annotations mark match
ranges using red `!~~` to indicate bad matches that are errors.

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 bad match, such as:
           - CHECK-NEXT on same line as previous match (error)
           - CHECK-NOT found (error)
  - X~~    marks search range when no match is found, such as:
           - CHECK-NEXT not found (error)
  - ?      marks fuzzy match when no match is found
  - colors error, fuzzy match

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

$ FileCheck -v -dump-input=always check3 < input3 |& sed -n '/^<<<</,$p'
<<<<<<
       1: abc foobar def
not:2         !~~~~~     error: no match expected
>>>>>>

$ cat check3
CHECK:     abc
CHECK-NOT: foobar
CHECK:     def

$ cat input3
abc foobar def
```

Reviewed By: george.karpenkov, probinson

Differential Revision: https://reviews.llvm.org/D53896

llvm-svn: 349421

1 files changed, 47 insertions, 0 deletions

diff --git a/llvm/test/FileCheck/dump-input-annotations.txt b/llvm/test/FileCheck/dump-input-annotations.txt
index d225ed2bd14..c808fb2c6d4 100644
--- a/llvm/test/FileCheck/dump-input-annotations.txt
+++ b/llvm/test/FileCheck/dump-input-annotations.txt
@@ -235,6 +235,53 @@
 ; EMP2-NOT:    {{.}}
 
 ;--------------------------------------------------
+; CHECK-NOT
+;--------------------------------------------------
+
+; No match (success) and unexpected match (error).
+
+; RUN: echo 'hello' > %t.in
+; RUN: echo 'world' >> %t.in
+; RUN: echo 'again' >> %t.in
+
+; RUN: echo 'CHECK-NOT: goodbye' > %t.chk
+; RUN: echo 'CHECK-NOT: world' >> %t.chk
+
+; RUN: not FileCheck -dump-input=always -input-file %t.in %t.chk 2>&1 \
+; RUN: | FileCheck -match-full-lines %s -check-prefix=NOT
+; RUN: not FileCheck -dump-input=always -input-file %t.in %t.chk -v 2>&1 \
+; RUN: | FileCheck -match-full-lines %s -check-prefixes=NOT,NOT-V
+; RUN: not FileCheck -dump-input=always -input-file %t.in %t.chk -vv 2>&1 \
+; RUN: | FileCheck -match-full-lines %s -check-prefixes=NOT,NOT-V,NOT-VV
+
+; NOT:         <<<<<<
+; NOT-NEXT:           1: hello
+; NOT-NEXT:           2: world
+; NOT-NEXT:    not:2     !~~~~ error: no match expected
+; NOT-NEXT:           3: again
+; NOT-NEXT:    >>>>>>
+; NOT-NOT:     {{.}}
+
+; Again, but with a CHECK instead of EOF as search range end.
+
+; RUN: echo 'CHECK: ain' >> %t.chk
+
+; RUN: not FileCheck -dump-input=always -input-file %t.in %t.chk 2>&1 \
+; RUN: | FileCheck -match-full-lines %s -check-prefix=NOT2
+; RUN: not FileCheck -dump-input=always -input-file %t.in %t.chk -v 2>&1 \
+; RUN: | FileCheck -match-full-lines %s -check-prefixes=NOT2,NOT2-V
+; RUN: not FileCheck -dump-input=always -input-file %t.in %t.chk -vv 2>&1 \
+; RUN: | FileCheck -match-full-lines %s -check-prefixes=NOT2,NOT2-V,NOT2-VV
+
+; NOT2:         <<<<<<
+; NOT2-NEXT:             1: hello
+; NOT2-NEXT:             2: world
+; NOT2-NEXT:    not:2       !~~~~ error: no match expected
+; NOT2-NEXT:             3: again
+; NOT2-NEXT:    >>>>>>
+; NOT2-NOT:     {{.}}
+
+;--------------------------------------------------
 ; CHECK-DAG
 ;--------------------------------------------------