forked from OSchip/llvm-project
604 lines
22 KiB
ReStructuredText
604 lines
22 KiB
ReStructuredText
FileCheck - Flexible pattern matching file verifier
|
|
===================================================
|
|
|
|
SYNOPSIS
|
|
--------
|
|
|
|
:program:`FileCheck` *match-filename* [*--check-prefix=XXX*] [*--strict-whitespace*]
|
|
|
|
DESCRIPTION
|
|
-----------
|
|
|
|
:program:`FileCheck` reads two files (one from standard input, and one
|
|
specified on the command line) and uses one to verify the other. This
|
|
behavior is particularly useful for the testsuite, which wants to verify that
|
|
the output of some tool (e.g. :program:`llc`) contains the expected information
|
|
(for example, a movsd from esp or whatever is interesting). This is similar to
|
|
using :program:`grep`, but it is optimized for matching multiple different
|
|
inputs in one file in a specific order.
|
|
|
|
The ``match-filename`` file specifies the file that contains the patterns to
|
|
match. The file to verify is read from standard input unless the
|
|
:option:`--input-file` option is used.
|
|
|
|
OPTIONS
|
|
-------
|
|
|
|
Options are parsed from the environment variable ``FILECHECK_OPTS``
|
|
and from the command line.
|
|
|
|
.. option:: -help
|
|
|
|
Print a summary of command line options.
|
|
|
|
.. option:: --check-prefix prefix
|
|
|
|
FileCheck searches the contents of ``match-filename`` for patterns to
|
|
match. By default, these patterns are prefixed with "``CHECK:``".
|
|
If you'd like to use a different prefix (e.g. because the same input
|
|
file is checking multiple different tool or options), the
|
|
:option:`--check-prefix` argument allows you to specify one or more
|
|
prefixes to match. Multiple prefixes are useful for tests which might
|
|
change for different run options, but most lines remain the same.
|
|
|
|
.. option:: --check-prefixes prefix1,prefix2,...
|
|
|
|
An alias of :option:`--check-prefix` that allows multiple prefixes to be
|
|
specified as a comma separated list.
|
|
|
|
.. option:: --input-file filename
|
|
|
|
File to check (defaults to stdin).
|
|
|
|
.. option:: --match-full-lines
|
|
|
|
By default, FileCheck allows matches of anywhere on a line. This
|
|
option will require all positive matches to cover an entire
|
|
line. Leading and trailing whitespace is ignored, unless
|
|
:option:`--strict-whitespace` is also specified. (Note: negative
|
|
matches from ``CHECK-NOT`` are not affected by this option!)
|
|
|
|
Passing this option is equivalent to inserting ``{{^ *}}`` or
|
|
``{{^}}`` before, and ``{{ *$}}`` or ``{{$}}`` after every positive
|
|
check pattern.
|
|
|
|
.. option:: --strict-whitespace
|
|
|
|
By default, FileCheck canonicalizes input horizontal whitespace (spaces and
|
|
tabs) which causes it to ignore these differences (a space will match a tab).
|
|
The :option:`--strict-whitespace` argument disables this behavior. End-of-line
|
|
sequences are canonicalized to UNIX-style ``\n`` in all modes.
|
|
|
|
.. option:: --implicit-check-not check-pattern
|
|
|
|
Adds implicit negative checks for the specified patterns between positive
|
|
checks. The option allows writing stricter tests without stuffing them with
|
|
``CHECK-NOT``\ s.
|
|
|
|
For example, "``--implicit-check-not warning:``" can be useful when testing
|
|
diagnostic messages from tools that don't have an option similar to ``clang
|
|
-verify``. With this option FileCheck will verify that input does not contain
|
|
warnings not covered by any ``CHECK:`` patterns.
|
|
|
|
.. option:: --dump-input <mode>
|
|
|
|
Dump input to stderr, adding annotations representing currently enabled
|
|
diagnostics. Do this either 'always', on 'fail', or 'never'. Specify 'help'
|
|
to explain the dump format and quit.
|
|
|
|
.. option:: --dump-input-on-failure
|
|
|
|
When the check fails, dump all of the original input. This option is
|
|
deprecated in favor of `--dump-input=fail`.
|
|
|
|
.. option:: --enable-var-scope
|
|
|
|
Enables scope for regex variables.
|
|
|
|
Variables with names that start with ``$`` are considered global and
|
|
remain set throughout the file.
|
|
|
|
All other variables get undefined after each encountered ``CHECK-LABEL``.
|
|
|
|
.. option:: -D<VAR=VALUE>
|
|
|
|
Sets a filecheck variable ``VAR`` with value ``VALUE`` that can be used in
|
|
``CHECK:`` lines.
|
|
|
|
.. option:: -version
|
|
|
|
Show the version number of this program.
|
|
|
|
.. option:: -v
|
|
|
|
Print directive pattern matches.
|
|
|
|
.. option:: -vv
|
|
|
|
Print information helpful in diagnosing internal FileCheck issues, such as
|
|
discarded overlapping ``CHECK-DAG:`` matches, implicit EOF pattern matches,
|
|
and ``CHECK-NOT:`` patterns that do not have matches. Implies ``-v``.
|
|
|
|
.. option:: --allow-deprecated-dag-overlap
|
|
|
|
Enable overlapping among matches in a group of consecutive ``CHECK-DAG:``
|
|
directives. This option is deprecated and is only provided for convenience
|
|
as old tests are migrated to the new non-overlapping ``CHECK-DAG:``
|
|
implementation.
|
|
|
|
.. option:: --color
|
|
|
|
Use colors in output (autodetected by default).
|
|
|
|
EXIT STATUS
|
|
-----------
|
|
|
|
If :program:`FileCheck` verifies that the file matches the expected contents,
|
|
it exits with 0. Otherwise, if not, or if an error occurs, it will exit with a
|
|
non-zero value.
|
|
|
|
TUTORIAL
|
|
--------
|
|
|
|
FileCheck is typically used from LLVM regression tests, being invoked on the RUN
|
|
line of the test. A simple example of using FileCheck from a RUN line looks
|
|
like this:
|
|
|
|
.. code-block:: llvm
|
|
|
|
; RUN: llvm-as < %s | llc -march=x86-64 | FileCheck %s
|
|
|
|
This syntax says to pipe the current file ("``%s``") into ``llvm-as``, pipe
|
|
that into ``llc``, then pipe the output of ``llc`` into ``FileCheck``. This
|
|
means that FileCheck will be verifying its standard input (the llc output)
|
|
against the filename argument specified (the original ``.ll`` file specified by
|
|
"``%s``"). To see how this works, let's look at the rest of the ``.ll`` file
|
|
(after the RUN line):
|
|
|
|
.. code-block:: llvm
|
|
|
|
define void @sub1(i32* %p, i32 %v) {
|
|
entry:
|
|
; CHECK: sub1:
|
|
; CHECK: subl
|
|
%0 = tail call i32 @llvm.atomic.load.sub.i32.p0i32(i32* %p, i32 %v)
|
|
ret void
|
|
}
|
|
|
|
define void @inc4(i64* %p) {
|
|
entry:
|
|
; CHECK: inc4:
|
|
; CHECK: incq
|
|
%0 = tail call i64 @llvm.atomic.load.add.i64.p0i64(i64* %p, i64 1)
|
|
ret void
|
|
}
|
|
|
|
Here you can see some "``CHECK:``" lines specified in comments. Now you can
|
|
see how the file is piped into ``llvm-as``, then ``llc``, and the machine code
|
|
output is what we are verifying. FileCheck checks the machine code output to
|
|
verify that it matches what the "``CHECK:``" lines specify.
|
|
|
|
The syntax of the "``CHECK:``" lines is very simple: they are fixed strings that
|
|
must occur in order. FileCheck defaults to ignoring horizontal whitespace
|
|
differences (e.g. a space is allowed to match a tab) but otherwise, the contents
|
|
of the "``CHECK:``" line is required to match some thing in the test file exactly.
|
|
|
|
One nice thing about FileCheck (compared to grep) is that it allows merging
|
|
test cases together into logical groups. For example, because the test above
|
|
is checking for the "``sub1:``" and "``inc4:``" labels, it will not match
|
|
unless there is a "``subl``" in between those labels. If it existed somewhere
|
|
else in the file, that would not count: "``grep subl``" matches if "``subl``"
|
|
exists anywhere in the file.
|
|
|
|
The FileCheck -check-prefix option
|
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
|
|
The FileCheck `-check-prefix` option allows multiple test
|
|
configurations to be driven from one `.ll` file. This is useful in many
|
|
circumstances, for example, testing different architectural variants with
|
|
:program:`llc`. Here's a simple example:
|
|
|
|
.. code-block:: llvm
|
|
|
|
; RUN: llvm-as < %s | llc -mtriple=i686-apple-darwin9 -mattr=sse41 \
|
|
; RUN: | FileCheck %s -check-prefix=X32
|
|
; RUN: llvm-as < %s | llc -mtriple=x86_64-apple-darwin9 -mattr=sse41 \
|
|
; RUN: | FileCheck %s -check-prefix=X64
|
|
|
|
define <4 x i32> @pinsrd_1(i32 %s, <4 x i32> %tmp) nounwind {
|
|
%tmp1 = insertelement <4 x i32>; %tmp, i32 %s, i32 1
|
|
ret <4 x i32> %tmp1
|
|
; X32: pinsrd_1:
|
|
; X32: pinsrd $1, 4(%esp), %xmm0
|
|
|
|
; X64: pinsrd_1:
|
|
; X64: pinsrd $1, %edi, %xmm0
|
|
}
|
|
|
|
In this case, we're testing that we get the expected code generation with
|
|
both 32-bit and 64-bit code generation.
|
|
|
|
The "CHECK-NEXT:" directive
|
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
|
|
Sometimes you want to match lines and would like to verify that matches
|
|
happen on exactly consecutive lines with no other lines in between them. In
|
|
this case, you can use "``CHECK:``" and "``CHECK-NEXT:``" directives to specify
|
|
this. If you specified a custom check prefix, just use "``<PREFIX>-NEXT:``".
|
|
For example, something like this works as you'd expect:
|
|
|
|
.. code-block:: llvm
|
|
|
|
define void @t2(<2 x double>* %r, <2 x double>* %A, double %B) {
|
|
%tmp3 = load <2 x double>* %A, align 16
|
|
%tmp7 = insertelement <2 x double> undef, double %B, i32 0
|
|
%tmp9 = shufflevector <2 x double> %tmp3,
|
|
<2 x double> %tmp7,
|
|
<2 x i32> < i32 0, i32 2 >
|
|
store <2 x double> %tmp9, <2 x double>* %r, align 16
|
|
ret void
|
|
|
|
; CHECK: t2:
|
|
; CHECK: movl 8(%esp), %eax
|
|
; CHECK-NEXT: movapd (%eax), %xmm0
|
|
; CHECK-NEXT: movhpd 12(%esp), %xmm0
|
|
; CHECK-NEXT: movl 4(%esp), %eax
|
|
; CHECK-NEXT: movapd %xmm0, (%eax)
|
|
; CHECK-NEXT: ret
|
|
}
|
|
|
|
"``CHECK-NEXT:``" directives reject the input unless there is exactly one
|
|
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 = !DILocation(line: 5, scope: !1, inlinedAt: !2)
|
|
|
|
; CHECK: !DILocation(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-EMPTY:" directive
|
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
|
|
If you need to check that the next line has nothing on it, not even whitespace,
|
|
you can use the "``CHECK-EMPTY:``" directive.
|
|
|
|
.. code-block:: llvm
|
|
|
|
declare void @foo()
|
|
|
|
declare void @bar()
|
|
; CHECK: foo
|
|
; CHECK-EMPTY:
|
|
; CHECK-NEXT: bar
|
|
|
|
Just like "``CHECK-NEXT:``" the directive will fail if there is more than one
|
|
newline before it finds the next blank line, and it cannot be the first
|
|
directive in a file.
|
|
|
|
The "CHECK-NOT:" directive
|
|
~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
|
|
The "``CHECK-NOT:``" directive is used to verify that a string doesn't occur
|
|
between two matches (or before the first match, or after the last match). For
|
|
example, to verify that a load is removed by a transformation, a test like this
|
|
can be used:
|
|
|
|
.. code-block:: llvm
|
|
|
|
define i8 @coerce_offset0(i32 %V, i32* %P) {
|
|
store i32 %V, i32* %P
|
|
|
|
%P2 = bitcast i32* %P to i8*
|
|
%P3 = getelementptr i8* %P2, i32 2
|
|
|
|
%A = load i8* %P3
|
|
ret i8 %A
|
|
; CHECK: @coerce_offset0
|
|
; CHECK-NOT: load
|
|
; CHECK: ret i8
|
|
}
|
|
|
|
The "CHECK-COUNT:" directive
|
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
|
|
If you need to match multiple lines with the same pattern over and over again
|
|
you can repeat a plain ``CHECK:`` as many times as needed. If that looks too
|
|
boring you can instead use a counted check "``CHECK-COUNT-<num>:``", where
|
|
``<num>`` is a positive decimal number. It will match the pattern exactly
|
|
``<num>`` times, no more and no less. If you specified a custom check prefix,
|
|
just use "``<PREFIX>-COUNT-<num>:``" for the same effect.
|
|
Here is a simple example:
|
|
|
|
.. code-block:: text
|
|
|
|
Loop at depth 1
|
|
Loop at depth 1
|
|
Loop at depth 1
|
|
Loop at depth 1
|
|
Loop at depth 2
|
|
Loop at depth 3
|
|
|
|
; CHECK-COUNT-6: Loop at depth {{[0-9]+}}
|
|
; CHECK-NOT: Loop at depth {{[0-9]+}}
|
|
|
|
The "CHECK-DAG:" directive
|
|
~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
|
|
If it's necessary to match strings that don't occur in a strictly sequential
|
|
order, "``CHECK-DAG:``" could be used to verify them between two matches (or
|
|
before the first match, or after the last match). For example, clang emits
|
|
vtable globals in reverse order. Using ``CHECK-DAG:``, we can keep the checks
|
|
in the natural order:
|
|
|
|
.. code-block:: c++
|
|
|
|
// RUN: %clang_cc1 %s -emit-llvm -o - | FileCheck %s
|
|
|
|
struct Foo { virtual void method(); };
|
|
Foo f; // emit vtable
|
|
// CHECK-DAG: @_ZTV3Foo =
|
|
|
|
struct Bar { virtual void method(); };
|
|
Bar b;
|
|
// CHECK-DAG: @_ZTV3Bar =
|
|
|
|
``CHECK-NOT:`` directives could be mixed with ``CHECK-DAG:`` directives to
|
|
exclude strings between the surrounding ``CHECK-DAG:`` directives. As a result,
|
|
the surrounding ``CHECK-DAG:`` directives cannot be reordered, i.e. all
|
|
occurrences matching ``CHECK-DAG:`` before ``CHECK-NOT:`` must not fall behind
|
|
occurrences matching ``CHECK-DAG:`` after ``CHECK-NOT:``. For example,
|
|
|
|
.. code-block:: llvm
|
|
|
|
; CHECK-DAG: BEFORE
|
|
; CHECK-NOT: NOT
|
|
; CHECK-DAG: AFTER
|
|
|
|
This case will reject input strings where ``BEFORE`` occurs after ``AFTER``.
|
|
|
|
With captured variables, ``CHECK-DAG:`` is able to match valid topological
|
|
orderings of a DAG with edges from the definition of a variable to its use.
|
|
It's useful, e.g., when your test cases need to match different output
|
|
sequences from the instruction scheduler. For example,
|
|
|
|
.. code-block:: llvm
|
|
|
|
; CHECK-DAG: add [[REG1:r[0-9]+]], r1, r2
|
|
; CHECK-DAG: add [[REG2:r[0-9]+]], r3, r4
|
|
; CHECK: mul r5, [[REG1]], [[REG2]]
|
|
|
|
In this case, any order of that two ``add`` instructions will be allowed.
|
|
|
|
If you are defining `and` using variables in the same ``CHECK-DAG:`` block,
|
|
be aware that the definition rule can match `after` its use.
|
|
|
|
So, for instance, the code below will pass:
|
|
|
|
.. code-block:: text
|
|
|
|
; CHECK-DAG: vmov.32 [[REG2:d[0-9]+]][0]
|
|
; CHECK-DAG: vmov.32 [[REG2]][1]
|
|
vmov.32 d0[1]
|
|
vmov.32 d0[0]
|
|
|
|
While this other code, will not:
|
|
|
|
.. code-block:: text
|
|
|
|
; CHECK-DAG: vmov.32 [[REG2:d[0-9]+]][0]
|
|
; CHECK-DAG: vmov.32 [[REG2]][1]
|
|
vmov.32 d1[1]
|
|
vmov.32 d0[0]
|
|
|
|
While this can be very useful, it's also dangerous, because in the case of
|
|
register sequence, you must have a strong order (read before write, copy before
|
|
use, etc). If the definition your test is looking for doesn't match (because
|
|
of a bug in the compiler), it may match further away from the use, and mask
|
|
real bugs away.
|
|
|
|
In those cases, to enforce the order, use a non-DAG directive between DAG-blocks.
|
|
|
|
A ``CHECK-DAG:`` directive skips matches that overlap the matches of any
|
|
preceding ``CHECK-DAG:`` directives in the same ``CHECK-DAG:`` block. Not only
|
|
is this non-overlapping behavior consistent with other directives, but it's
|
|
also necessary to handle sets of non-unique strings or patterns. For example,
|
|
the following directives look for unordered log entries for two tasks in a
|
|
parallel program, such as the OpenMP runtime:
|
|
|
|
.. code-block:: text
|
|
|
|
// CHECK-DAG: [[THREAD_ID:[0-9]+]]: task_begin
|
|
// CHECK-DAG: [[THREAD_ID]]: task_end
|
|
//
|
|
// CHECK-DAG: [[THREAD_ID:[0-9]+]]: task_begin
|
|
// CHECK-DAG: [[THREAD_ID]]: task_end
|
|
|
|
The second pair of directives is guaranteed not to match the same log entries
|
|
as the first pair even though the patterns are identical and even if the text
|
|
of the log entries is identical because the thread ID manages to be reused.
|
|
|
|
The "CHECK-LABEL:" directive
|
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
|
|
Sometimes in a file containing multiple tests divided into logical blocks, one
|
|
or more ``CHECK:`` directives may inadvertently succeed by matching lines in a
|
|
later block. While an error will usually eventually be generated, the check
|
|
flagged as causing the error may not actually bear any relationship to the
|
|
actual source of the problem.
|
|
|
|
In order to produce better error messages in these cases, the "``CHECK-LABEL:``"
|
|
directive can be used. It is treated identically to a normal ``CHECK``
|
|
directive except that FileCheck makes an additional assumption that a line
|
|
matched by the directive cannot also be matched by any other check present in
|
|
``match-filename``; this is intended to be used for lines containing labels or
|
|
other unique identifiers. Conceptually, the presence of ``CHECK-LABEL`` divides
|
|
the input stream into separate blocks, each of which is processed independently,
|
|
preventing a ``CHECK:`` directive in one block matching a line in another block.
|
|
If ``--enable-var-scope`` is in effect, all local variables are cleared at the
|
|
beginning of the block.
|
|
|
|
For example,
|
|
|
|
.. code-block:: llvm
|
|
|
|
define %struct.C* @C_ctor_base(%struct.C* %this, i32 %x) {
|
|
entry:
|
|
; CHECK-LABEL: C_ctor_base:
|
|
; CHECK: mov [[SAVETHIS:r[0-9]+]], r0
|
|
; CHECK: bl A_ctor_base
|
|
; CHECK: mov r0, [[SAVETHIS]]
|
|
%0 = bitcast %struct.C* %this to %struct.A*
|
|
%call = tail call %struct.A* @A_ctor_base(%struct.A* %0)
|
|
%1 = bitcast %struct.C* %this to %struct.B*
|
|
%call2 = tail call %struct.B* @B_ctor_base(%struct.B* %1, i32 %x)
|
|
ret %struct.C* %this
|
|
}
|
|
|
|
define %struct.D* @D_ctor_base(%struct.D* %this, i32 %x) {
|
|
entry:
|
|
; CHECK-LABEL: D_ctor_base:
|
|
|
|
The use of ``CHECK-LABEL:`` directives in this case ensures that the three
|
|
``CHECK:`` directives only accept lines corresponding to the body of the
|
|
``@C_ctor_base`` function, even if the patterns match lines found later in
|
|
the file. Furthermore, if one of these three ``CHECK:`` directives fail,
|
|
FileCheck will recover by continuing to the next block, allowing multiple test
|
|
failures to be detected in a single invocation.
|
|
|
|
There is no requirement that ``CHECK-LABEL:`` directives contain strings that
|
|
correspond to actual syntactic labels in a source or output language: they must
|
|
simply uniquely match a single line in the file being verified.
|
|
|
|
``CHECK-LABEL:`` directives cannot contain variable definitions or uses.
|
|
|
|
FileCheck Pattern Matching Syntax
|
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
|
|
All FileCheck directives take a pattern to match.
|
|
For most uses of FileCheck, fixed string matching is perfectly sufficient. For
|
|
some things, a more flexible form of matching is desired. To support this,
|
|
FileCheck allows you to specify regular expressions in matching strings,
|
|
surrounded by double braces: ``{{yourregex}}``. FileCheck implements a POSIX
|
|
regular expression matcher; it supports Extended POSIX regular expressions
|
|
(ERE). Because we want to use fixed string matching for a majority of what we
|
|
do, FileCheck has been designed to support mixing and matching fixed string
|
|
matching with regular expressions. This allows you to write things like this:
|
|
|
|
.. code-block:: llvm
|
|
|
|
; CHECK: movhpd {{[0-9]+}}(%esp), {{%xmm[0-7]}}
|
|
|
|
In this case, any offset from the ESP register will be allowed, and any xmm
|
|
register will be allowed.
|
|
|
|
Because regular expressions are enclosed with double braces, they are
|
|
visually distinct, and you don't need to use escape characters within the double
|
|
braces like you would in C. In the rare case that you want to match double
|
|
braces explicitly from the input, you can use something ugly like
|
|
``{{[{][{]}}`` as your pattern.
|
|
|
|
FileCheck Variables
|
|
~~~~~~~~~~~~~~~~~~~
|
|
|
|
It is often useful to match a pattern and then verify that it occurs again
|
|
later in the file. For codegen tests, this can be useful to allow any register,
|
|
but verify that that register is used consistently later. To do this,
|
|
:program:`FileCheck` allows named variables to be defined and substituted into
|
|
patterns. Here is a simple example:
|
|
|
|
.. code-block:: llvm
|
|
|
|
; CHECK: test5:
|
|
; CHECK: notw [[REGISTER:%[a-z]+]]
|
|
; CHECK: andw {{.*}}[[REGISTER]]
|
|
|
|
The first check line matches a regex ``%[a-z]+`` and captures it into the
|
|
variable ``REGISTER``. The second line verifies that whatever is in
|
|
``REGISTER`` occurs later in the file after an "``andw``". :program:`FileCheck`
|
|
variable references are always contained in ``[[ ]]`` pairs, and their names can
|
|
be formed with the regex ``[a-zA-Z_][a-zA-Z0-9_]*``. If a colon follows the name,
|
|
then it is a definition of the variable; otherwise, it is a use.
|
|
|
|
:program:`FileCheck` variables can be defined multiple times, and uses always
|
|
get the latest value. Variables can also be used later on the same line they
|
|
were defined on. For example:
|
|
|
|
.. code-block:: llvm
|
|
|
|
; CHECK: op [[REG:r[0-9]+]], [[REG]]
|
|
|
|
Can be useful if you want the operands of ``op`` to be the same register,
|
|
and don't care exactly which register it is.
|
|
|
|
If ``--enable-var-scope`` is in effect, variables with names that
|
|
start with ``$`` are considered to be global. All others variables are
|
|
local. All local variables get undefined at the beginning of each
|
|
CHECK-LABEL block. Global variables are not affected by CHECK-LABEL.
|
|
This makes it easier to ensure that individual tests are not affected
|
|
by variables set in preceding tests.
|
|
|
|
FileCheck Expressions
|
|
~~~~~~~~~~~~~~~~~~~~~
|
|
|
|
Sometimes there's a need to verify output which refers line numbers of the
|
|
match file, e.g. when testing compiler diagnostics. This introduces a certain
|
|
fragility of the match file structure, as "``CHECK:``" lines contain absolute
|
|
line numbers in the same file, which have to be updated whenever line numbers
|
|
change due to text addition or deletion.
|
|
|
|
To support this case, FileCheck allows using ``[[@LINE]]``,
|
|
``[[@LINE+<offset>]]``, ``[[@LINE-<offset>]]`` expressions in patterns. These
|
|
expressions expand to a number of the line where a pattern is located (with an
|
|
optional integer offset).
|
|
|
|
This way match patterns can be put near the relevant test lines and include
|
|
relative line number references, for example:
|
|
|
|
.. code-block:: c++
|
|
|
|
// CHECK: test.cpp:[[@LINE+4]]:6: error: expected ';' after top level declarator
|
|
// CHECK-NEXT: {{^int a}}
|
|
// CHECK-NEXT: {{^ \^}}
|
|
// 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:: text
|
|
|
|
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``".
|