[Nasm-bugs] [Bug 3392893] New: Empty %rep block in mmacro causes an assertion failure panic

[noreply-nasm at dev.nasm.us]

https://bugzilla.nasm.us/show_bug.cgi?id=3392893

            Bug ID: 3392893
           Summary: Empty %rep block in mmacro causes an assertion failure
                    panic
           Product: NASM
           Version: 2.17 (development)
          Hardware: All
                OS: All
            Status: OPEN
          Severity: annoyance
          Priority: Medium
         Component: Assembler
          Assignee: nobody at nasm.us
          Reporter: pushbx at ulukai.org
                CC: chang.seok.bae at intel.com, gorcunov at gmail.com,
                    hpa at zytor.com, nasm-bugs at nasm.us
     Obtained from: Built from git using configure

In this test the "nasm" executable is as patched in
https://bugzilla.nasm.us/show_bug.cgi?id=3392892

The "orignasm" executable is
https://github.com/netwide-assembler/nasm/commit/a916e4127b2eaa3bf40bddf3de9b0ceefc0d98a4

The bug is trivial to avoid as even a blank line between the %rep and %endrep
is enough to avoid the panic. Any other content also seems to work.


test/20230720.2$ cat test1.asm
%macro mmac 0
%rep 1

%endrep
%endmacro

mmac
test/20230720.2$ cat test2.asm
%macro mmac 0
%rep 1
%endrep
%endmacro

mmac
test/20230720.2$ orignasm -v
NASM version 2.17rc0 compiled on Jul 20 2023
test/20230720.2$ orignasm test1.asm
test/20230720.2$ orignasm test2.asm
panic: test2.asm:6: assertion fm == istk->mstk.mstk failed at
asm/preproc.c:7568
test/20230720.2$ nasm -v
NASM version 2.17rc0 compiled on Jul 20 2023
test/20230720.2$ nasm test1.asm
test/20230720.2$ nasm test2.asm
panic: test2.asm:6: assertion fm == istk->mstk.mstk failed at
asm/preproc.c:7568
test/20230720.2$

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