<div><div dir="auto">Back to the original proposal, my biggest concern is that a single inline test could generate many FileCheck invocations. This could cause measurable performance impact on the test suite. Have you considered this?</div></div><div dir="auto"><br></div><div dir="auto">Another possible solution is what i mentioned earlier, basically to expose a debugger object model. This would allow you to accomplish what you want without FileCheck, while simultaneously being making many other types of tests easier to write at the same time. On the other hand, it’s a larger effort to create this system, but I think long term it would pay back enormously (it’s even useful as a general purpose debugger feature, not limited to testing)</div><div><br><div class="gmail_quote"><div dir="ltr">On Tue, Aug 14, 2018 at 5:31 PM Vedant Kumar via lldb-dev <<a href="mailto:lldb-dev@lists.llvm.org">lldb-dev@lists.llvm.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word;line-break:after-white-space">Hello,<div><br></div><div>I'd like to make FileCheck available within lldb inline tests, in addition to existing helpers like 'runCmd' and 'expect'.</div><div><br></div><div>My motivation is that several tests I'm working on can't be made as rigorous as they need to be without FileCheck-style checks. In particular, the 'matching', 'substrs', and 'patterns' arguments to runCmd/expect don't allow me to verify the ordering of checked input, to be stringent about line numbers, or to capture & reuse snippets of text from the input stream.</div><div><br></div><div>I'd curious to know if anyone else is interested or would be willing to review this (<a href="https://reviews.llvm.org/D50751" target="_blank">https://reviews.llvm.org/D50751</a>).</div><div><br></div><div>Here's an example of an inline test which benefits from FileCheck-style checking. This test is trying to check that certain frames appear in a backtrace when stopped inside of the "sink" function. Notice that without FileCheck, it's not possible to verify the order in which frames are printed, and that dealing with line numbers would be cumbersome.</div><div><br></div><div>```</div><div>--- a/lldb/packages/Python/lldbsuite/test/functionalities/tail_call_frames/unambiguous_sequence/main.cpp<br>+++ b/lldb/packages/Python/lldbsuite/test/functionalities/tail_call_frames/unambiguous_sequence/main.cpp<br>@@ -9,16 +9,21 @@<br> <br> volatile int x;<br> <br>+// CHECK: frame #0: {{.*}}sink() at main.cpp:[[@LINE+2]] [opt]<br> void __attribute__((noinline)) sink() {<br>- x++; //% self.expect("bt", substrs = ['main', 'func1', 'func2', 'func3', 'sink'])<br>+ x++; //% self.filecheck("bt", "main.cpp")<br> }<br> <br>+// CHECK-NEXT: frame #1: {{.*}}func3() {{.*}}[opt] [artificial]<br> void __attribute__((noinline)) func3() { sink(); /* tail */ }<br> <br>+// CHECK-NEXT: frame #2: {{.*}}func2() at main.cpp:[[@LINE+1]] [opt]<br> void __attribute__((disable_tail_calls, noinline)) func2() { func3(); /* regular */ }<br> <br>+// CHECK-NEXT: frame #3: {{.*}}func1() {{.*}}[opt] [artificial]<br> void __attribute__((noinline)) func1() { func2(); /* tail */ }<br> <br>+// CHECK-NEXT: frame #4: {{.*}}main at main.cpp:[[@LINE+2]] [opt]<br> int __attribute__((disable_tail_calls)) main() {<br> func1(); /* regular */<br> return 0;</div><div>```</div><div><br></div><div>For reference, here's the output of the "bt" command:</div><div><br></div><div>```</div><div>runCmd: bt<br>output: * thread #1, queue = 'com.apple.main-thread', stop reason = breakpoint 1.1<br> * frame #0: 0x000000010c6a6f64 a.out`sink() at main.cpp:14 [opt]<br> frame #1: 0x000000010c6a6f70 a.out`func3() at main.cpp:15 [opt] [artificial]<br> frame #2: 0x000000010c6a6f89 a.out`func2() at main.cpp:21 [opt]<br> frame #3: 0x000000010c6a6f90 a.out`func1() at main.cpp:21 [opt] [artificial]<br> frame #4: 0x000000010c6a6fa9 a.out`main at main.cpp:28 [opt]<br></div><div>```</div><div><br></div><div>thanks,</div><div>vedant</div></div>_______________________________________________<br>
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