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Ilya Yanok 451c1596be Make lambda symbols stable post a3abf1187e 
Commit a3abf1187e fixes some cases of
lambdas having unstable symbol names between compilation units by
using `generateIdWithLoc` to generate stable lambda names, however since
LOC doesn't uniquely identify a lambda instance (because templates,
mixins, static foreach and foreach unrolling), `generateIdWithLoc`
adds a counter, so there is still some instability going on.

`generateIdWithLoc` makes the name uniq per file+loc, by adding adding a
numeric suffix. But the order of instantiations might be different
across compilation units, so with this counting scheme we are back to
unstable names, so one module might have

`t!0.__lambda_LOC` and
`t!1.__lambda_LOC_1`

while another one has

`t!1.__lambda_LOC`

This is not a critical problem, but at very least the code gets
duplicated for no reason. I also have an example where it leads to
linking error, but since it's not a small one and fails to minimize
further, I suspect it's a result of interaction with some other bug.

The thing is we don't even need uniqueness for those lambdas inside
templates/mixins: their final names will have the instantiation prefix anyway.
But we can't also just disable this uniqueness check completely: `static
foreach` as well as unrollings of the normal `foreach` with lambdas in
the loop body will have several copies of a single lambda with the same
file+loc. So here we do want to keep making them unique. Fortunately, I
don't think a `foreach` could be iterated in different order in
different compilation units, so hopefully if we limit the counting to
this case only, it won't make symbols unstable.

To implement this idea, I've added an extra `parent` argument to
`generateIdWithLoc`: it works like using `parent ~ prefix` prefix, but
without adding `parent` to the final output.

Fixes since last review:
 1. Changed `fromStringz` to `toDString`
 2. Added a test to showcase the problem
2024-12-04 11:04:26 +01:00
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c11447.d Move dmd files into compiler/ 2022-07-09 18:53:07 +02:00
ccov2.c fix Issue 23629 - importC: Need to support code coverage analysis (#15913) 2023-12-16 13:11:35 -08:00
circularA.d Move dmd files into compiler/ 2022-07-09 18:53:07 +02:00
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freer.i fix Issue 23387 - ImportC: identical structs defined in two C files lead to duplicate .init symbol on macOS 2023-02-04 23:25:55 -08:00
gdb22905b.d Fix issue 22905 - gdb backtrace contains wrong location 2023-12-29 05:20:07 +08:00
gdb22905c.d Fix issue 22905 - gdb backtrace contains wrong location 2023-12-29 05:20:07 +08:00
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imp22624.c Move dmd files into compiler/ 2022-07-09 18:53:07 +02:00
imp23014.i fix Issue 23014 - importC: static thread-locals do not work (#15069) 2023-04-04 13:15:58 +03:00
imp23402a.c fix Issue 23402 - importc function definitions from includes can cause D name conflicts (#15101) 2023-04-13 12:17:15 -07:00
imp23402b.c fix Issue 23402 - importc function definitions from includes can cause D name conflicts (#15101) 2023-04-13 12:17:15 -07:00
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issue18919b.d Fix Bugzilla 24519 - compiler segfault on default argument with slice operator [] 2024-04-24 22:38:54 +08:00
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link11069z.d Deprecate 'in ref' to prepare for -preview=in (#14931) 2023-03-07 11:51:36 +02:00
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link13415a.d dmd: Deprecate 'in' parameters on non-extern(D,C++) functions (#14951) 2023-03-08 10:57:41 +02:00
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mainx23837.c fix Issue 23837 - importc fails to link on windows x86 but successes on x64 (#15126) 2023-04-26 11:39:57 +03:00
maker.i fix Issue 23387 - ImportC: identical structs defined in two C files lead to duplicate .init symbol on macOS 2023-02-04 23:25:55 -08:00
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standalone_b.d Add @standalone attribute for module constructors (#15537) 2023-12-22 11:03:03 -08:00
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test23722_2b.d Make lambda symbols stable post a3abf1187e 2024-12-04 11:04:26 +01:00
test23722b.d Fix 23722 - Lambdas are mangled incorrectly when using multiple compi… (#15343) 2024-11-27 12:03:16 +01:00
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