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280 lines
10 KiB
ReStructuredText
280 lines
10 KiB
ReStructuredText
FileCheck - Flexible pattern matching file verifier
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===================================================
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SYNOPSIS
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--------
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:program:`FileCheck` *match-filename* [*--check-prefix=XXX*] [*--strict-whitespace*]
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DESCRIPTION
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-----------
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:program:`FileCheck` reads two files (one from standard input, and one
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specified on the command line) and uses one to verify the other. This
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behavior is particularly useful for the testsuite, which wants to verify that
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the output of some tool (e.g. :program:`llc`) contains the expected information
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(for example, a movsd from esp or whatever is interesting). This is similar to
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using :program:`grep`, but it is optimized for matching multiple different
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inputs in one file in a specific order.
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The ``match-filename`` file specifies the file that contains the patterns to
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match. The file to verify is always read from standard input.
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OPTIONS
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-------
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.. option:: -help
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Print a summary of command line options.
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.. option:: --check-prefix prefix
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FileCheck searches the contents of ``match-filename`` for patterns to match.
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By default, these patterns are prefixed with "``CHECK:``". If you'd like to
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use a different prefix (e.g. because the same input file is checking multiple
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different tool or options), the :option:`--check-prefix` argument allows you
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to specify a specific prefix to match.
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.. option:: --input-file filename
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File to check (defaults to stdin).
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.. option:: --strict-whitespace
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By default, FileCheck canonicalizes input horizontal whitespace (spaces and
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tabs) which causes it to ignore these differences (a space will match a tab).
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The :option:`--strict-whitespace` argument disables this behavior. End-of-line
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sequences are canonicalized to UNIX-style '\n' in all modes.
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.. option:: -version
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Show the version number of this program.
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EXIT STATUS
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-----------
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If :program:`FileCheck` verifies that the file matches the expected contents,
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it exits with 0. Otherwise, if not, or if an error occurs, it will exit with a
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non-zero value.
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TUTORIAL
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--------
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FileCheck is typically used from LLVM regression tests, being invoked on the RUN
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line of the test. A simple example of using FileCheck from a RUN line looks
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like this:
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.. code-block:: llvm
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; RUN: llvm-as < %s | llc -march=x86-64 | FileCheck %s
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This syntax says to pipe the current file ("``%s``") into ``llvm-as``, pipe
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that into ``llc``, then pipe the output of ``llc`` into ``FileCheck``. This
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means that FileCheck will be verifying its standard input (the llc output)
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against the filename argument specified (the original ``.ll`` file specified by
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"``%s``"). To see how this works, let's look at the rest of the ``.ll`` file
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(after the RUN line):
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.. code-block:: llvm
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define void @sub1(i32* %p, i32 %v) {
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entry:
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; CHECK: sub1:
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; CHECK: subl
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%0 = tail call i32 @llvm.atomic.load.sub.i32.p0i32(i32* %p, i32 %v)
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ret void
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}
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define void @inc4(i64* %p) {
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entry:
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; CHECK: inc4:
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; CHECK: incq
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%0 = tail call i64 @llvm.atomic.load.add.i64.p0i64(i64* %p, i64 1)
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ret void
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}
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Here you can see some "``CHECK:``" lines specified in comments. Now you can
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see how the file is piped into ``llvm-as``, then ``llc``, and the machine code
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output is what we are verifying. FileCheck checks the machine code output to
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verify that it matches what the "``CHECK:``" lines specify.
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The syntax of the "``CHECK:``" lines is very simple: they are fixed strings that
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must occur in order. FileCheck defaults to ignoring horizontal whitespace
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differences (e.g. a space is allowed to match a tab) but otherwise, the contents
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of the "``CHECK:``" line is required to match some thing in the test file exactly.
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One nice thing about FileCheck (compared to grep) is that it allows merging
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test cases together into logical groups. For example, because the test above
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is checking for the "``sub1:``" and "``inc4:``" labels, it will not match
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unless there is a "``subl``" in between those labels. If it existed somewhere
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else in the file, that would not count: "``grep subl``" matches if "``subl``"
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exists anywhere in the file.
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The FileCheck -check-prefix option
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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The FileCheck :option:`-check-prefix` option allows multiple test
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configurations to be driven from one `.ll` file. This is useful in many
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circumstances, for example, testing different architectural variants with
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:program:`llc`. Here's a simple example:
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.. code-block:: llvm
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; RUN: llvm-as < %s | llc -mtriple=i686-apple-darwin9 -mattr=sse41 \
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; RUN: | FileCheck %s -check-prefix=X32
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; RUN: llvm-as < %s | llc -mtriple=x86_64-apple-darwin9 -mattr=sse41 \
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; RUN: | FileCheck %s -check-prefix=X64
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define <4 x i32> @pinsrd_1(i32 %s, <4 x i32> %tmp) nounwind {
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%tmp1 = insertelement <4 x i32>; %tmp, i32 %s, i32 1
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ret <4 x i32> %tmp1
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; X32: pinsrd_1:
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; X32: pinsrd $1, 4(%esp), %xmm0
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; X64: pinsrd_1:
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; X64: pinsrd $1, %edi, %xmm0
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}
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In this case, we're testing that we get the expected code generation with
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both 32-bit and 64-bit code generation.
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The "CHECK-NEXT:" directive
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~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Sometimes you want to match lines and would like to verify that matches
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happen on exactly consecutive lines with no other lines in between them. In
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this case, you can use "``CHECK:``" and "``CHECK-NEXT:``" directives to specify
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this. If you specified a custom check prefix, just use "``<PREFIX>-NEXT:``".
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For example, something like this works as you'd expect:
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.. code-block:: llvm
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define void @t2(<2 x double>* %r, <2 x double>* %A, double %B) {
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%tmp3 = load <2 x double>* %A, align 16
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%tmp7 = insertelement <2 x double> undef, double %B, i32 0
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%tmp9 = shufflevector <2 x double> %tmp3,
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<2 x double> %tmp7,
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<2 x i32> < i32 0, i32 2 >
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store <2 x double> %tmp9, <2 x double>* %r, align 16
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ret void
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; CHECK: t2:
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; CHECK: movl 8(%esp), %eax
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; CHECK-NEXT: movapd (%eax), %xmm0
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; CHECK-NEXT: movhpd 12(%esp), %xmm0
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; CHECK-NEXT: movl 4(%esp), %eax
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; CHECK-NEXT: movapd %xmm0, (%eax)
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; CHECK-NEXT: ret
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}
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"``CHECK-NEXT:``" directives reject the input unless there is exactly one
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newline between it and the previous directive. A "``CHECK-NEXT:``" cannot be
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the first directive in a file.
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The "CHECK-NOT:" directive
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~~~~~~~~~~~~~~~~~~~~~~~~~~
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The "``CHECK-NOT:``" directive is used to verify that a string doesn't occur
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between two matches (or before the first match, or after the last match). For
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example, to verify that a load is removed by a transformation, a test like this
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can be used:
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.. code-block:: llvm
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define i8 @coerce_offset0(i32 %V, i32* %P) {
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store i32 %V, i32* %P
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%P2 = bitcast i32* %P to i8*
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%P3 = getelementptr i8* %P2, i32 2
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%A = load i8* %P3
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ret i8 %A
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; CHECK: @coerce_offset0
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; CHECK-NOT: load
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; CHECK: ret i8
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}
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FileCheck Pattern Matching Syntax
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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The "``CHECK:``" and "``CHECK-NOT:``" directives both take a pattern to match.
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For most uses of FileCheck, fixed string matching is perfectly sufficient. For
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some things, a more flexible form of matching is desired. To support this,
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FileCheck allows you to specify regular expressions in matching strings,
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surrounded by double braces: ``{{yourregex}}``. Because we want to use fixed
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string matching for a majority of what we do, FileCheck has been designed to
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support mixing and matching fixed string matching with regular expressions.
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This allows you to write things like this:
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.. code-block:: llvm
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; CHECK: movhpd {{[0-9]+}}(%esp), {{%xmm[0-7]}}
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In this case, any offset from the ESP register will be allowed, and any xmm
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register will be allowed.
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Because regular expressions are enclosed with double braces, they are
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visually distinct, and you don't need to use escape characters within the double
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braces like you would in C. In the rare case that you want to match double
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braces explicitly from the input, you can use something ugly like
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``{{[{][{]}}`` as your pattern.
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FileCheck Variables
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~~~~~~~~~~~~~~~~~~~
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It is often useful to match a pattern and then verify that it occurs again
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later in the file. For codegen tests, this can be useful to allow any register,
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but verify that that register is used consistently later. To do this,
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:program:`FileCheck` allows named variables to be defined and substituted into
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patterns. Here is a simple example:
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.. code-block:: llvm
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; CHECK: test5:
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; CHECK: notw [[REGISTER:%[a-z]+]]
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; CHECK: andw {{.*}}[[REGISTER]]
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The first check line matches a regex ``%[a-z]+`` and captures it into the
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variable ``REGISTER``. The second line verifies that whatever is in
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``REGISTER`` occurs later in the file after an "``andw``". :program:`FileCheck`
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variable references are always contained in ``[[ ]]`` pairs, and their names can
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be formed with the regex ``[a-zA-Z][a-zA-Z0-9]*``. If a colon follows the name,
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then it is a definition of the variable; otherwise, it is a use.
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:program:`FileCheck` variables can be defined multiple times, and uses always
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get the latest value. Variables can also be used later on the same line they
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were defined on. For example:
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.. code-block:: llvm
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; CHECK: op [[REG:r[0-9]+]], [[REG]]
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Can be useful if you want the operands of ``op`` to be the same register,
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and don't care exactly which register it is.
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FileCheck Expressions
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~~~~~~~~~~~~~~~~~~~~~
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Sometimes there's a need to verify output which refers line numbers of the
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match file, e.g. when testing compiler diagnostics. This introduces a certain
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fragility of the match file structure, as "``CHECK:``" lines contain absolute
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line numbers in the same file, which have to be updated whenever line numbers
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change due to text addition or deletion.
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To support this case, FileCheck allows using ``[[@LINE]]``,
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``[[@LINE+<offset>]]``, ``[[@LINE-<offset>]]`` expressions in patterns. These
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expressions expand to a number of the line where a pattern is located (with an
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optional integer offset).
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This way match patterns can be put near the relevant test lines and include
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relative line number references, for example:
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.. code-block:: c++
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// CHECK: test.cpp:[[@LINE+4]]:6: error: expected ';' after top level declarator
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// CHECK-NEXT: {{^int a}}
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// CHECK-NEXT: {{^ \^}}
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// CHECK-NEXT: {{^ ;}}
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int a
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