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Diffstat (limited to 'llvm/docs/CommandGuide/FileCheck.rst')
| -rw-r--r-- | llvm/docs/CommandGuide/FileCheck.rst | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/llvm/docs/CommandGuide/FileCheck.rst b/llvm/docs/CommandGuide/FileCheck.rst index 3e4c29f1572..a0ca1bfe52f 100644 --- a/llvm/docs/CommandGuide/FileCheck.rst +++ b/llvm/docs/CommandGuide/FileCheck.rst @@ -461,3 +461,22 @@ relative line number references, for example: // CHECK-NEXT: {{^ ;}} int a +Matching Newline Characters +~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +To match newline characters in regular expressions the character class +``[[:space:]]`` can be used. For example, the following pattern: + +.. code-block:: c++ + + // CHECK: DW_AT_location [DW_FORM_sec_offset] ([[DLOC:0x[0-9a-f]+]]){{[[:space:]].*}}"intd" + +matches output of the form (from llvm-dwarfdump): + +.. code-block:: llvm + + DW_AT_location [DW_FORM_sec_offset] (0x00000233) + DW_AT_name [DW_FORM_strp] ( .debug_str[0x000000c9] = "intd") + +letting us set the :program:`FileCheck` variable ``DLOC`` to the desired value +``0x00000233``, extracted from the line immediately preceding "``intd``". |
