Summary:
This was always the intended behavior, but had not been
implemented. This ordering is important for Emscripten when generating
.mem files while compiling to JS, since only zeros at the end of
initialized memory can be dropped.
Fixes https://github.com/emscripten-core/emscripten/issues/8999
Reviewers: sbc100
Subscribers: dschuff, jgravelle-google, aheejin, sunfish, llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D67736
llvm-svn: 372284
Summary:
- `__wasm_init_memory` is now the WebAssembly start function instead
of being called from `__wasm_call_ctors` or called directly by the
runtime.
- Adds a new synthetic data symbol `__wasm_init_memory_flag` that is
atomically incremented from zero to one by the thread responsible
for initializing memory.
- All threads now unconditionally perform data.drop on all passive
segments.
- Removes --passive-segments and --active-segments flags and controls
segment type based on --shared-memory instead. The deleted flags
were only present to ameliorate the upgrade path in Emscripten.
Reviewers: sbc100, aheejin
Subscribers: dschuff, jgravelle-google, sunfish, jfb, llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D65783
llvm-svn: 370965
Summary:
`createSyntheticSymbols`, which creates `WasmSym::InitTLS`, is only called
when `!config->relocatable`, but this condition is not checked when calling
`createInitTLSFunction`.
This diff checks `!config->relocatable` before calling `createInitTLSFunction`.
Fixes https://github.com/emscripten-core/emscripten/issues/9155.
Reviewers: tlively, aheejin, kripken, sbc100
Subscribers: dschuff, jgravelle-google, sunfish, llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D65785
llvm-svn: 368078
Summary:
Rename MemoryIndex to InitFlags and implement logic for determining
data segment layout in ObjectYAML and MC. Also adds a "passive" flag
for the .section assembler directive although this cannot be assembled
yet because the assembler does not support data sections.
Reviewers: sbc100, aardappel, aheejin, dschuff
Subscribers: jgravelle-google, hiraditya, sunfish, rupprecht, llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D57938
llvm-svn: 354397
Update LLD test expectations for new symbol ordering introduced by
Differential D43685.
Differential Revision: https://reviews.llvm.org/D43875
llvm-svn: 326335
This means we don't need to write the linking metadata section
at all for executable (non-relocatable) output.
Differential Revision: https://reviews.llvm.org/D42869
llvm-svn: 326268
Invoking lld as ld.lld, ld.ld64, lld-link or wasm-ld is preferred
than invoking lld as lld and pass an -flavor option. We have "lld"
file mostly for historical reasons.
Differential Revision: https://reviews.llvm.org/D43407
llvm-svn: 325405
Don't include type signatures that are not referenced by
some relocation.
We don't include this in the -gc-sections settings since
we are always building the type section from scratch,
just like we do the table elements.
In the future we might want to unify the relocation
processing which is currently done once for gc-sections
and then again for building the sympathetic type and
table sections.
Differential Revision: https://reviews.llvm.org/D42747
llvm-svn: 323931
Previously llvm was using 0 as the first table index for wasm object
files but now that has switched to 1 we can have the output of lld
do the same and simplify the code.
Patch by Nicholas Wilson!
Differential Revision: https://reviews.llvm.org/D42096
llvm-svn: 323378
This is somewhat preferable since (in many cases) it allows llc
to be run directly on the .ll files without having to pass the
`-mtriple` argument.
Differential Revision: https://reviews.llvm.org/D42438
llvm-svn: 323299
TABLE relocations now store the function that is being refered
to indirectly.
See rL323165.
Also extend the call-indirect.ll a little.
Based on a patch by Nicholas Wilson!
llvm-svn: 323168
We need these import since relocations are generated against them.
Patch by Nicholas Wilson!
Differential Revision: https://reviews.llvm.org/D42305
llvm-svn: 322990
When writing relocatable files we were exporting for all globals
(including file-local syms), but not for functions. Oops. To be
consistent with non-relocatable output, all symbols (file-local
and global) should be exported. Any symbol targetted by further
relocations needs to be exported. The lack of local function
exports was just an omission, I think.
Second bug: Local symbol names can collide, causing an illegal
Wasm file to be generated! Oops again. This only previously affected
producing relocatable output from two files, where each had a global
with the same name. We need to "budge" the symbol names for locals
that are exported on relocatable output.
Third bug: LLD's relocatable output wasn't writing out any symbol
flags! Thus the local globals weren't being marked as local, and
the hidden flag was also stripped...
Added tests to exercise colliding local names with/without
relocatable flag
Patch by Nicholas Wilson!
Differential Revision: https://reviews.llvm.org/D42105
llvm-svn: 322908
Simplify generation of "names" section by simply iterating
over the DefinedFunctions array.
This even fixes some bugs, judging by the test changes required.
Some tests are asserting that functions are named multiple times,
other tests are asserting that the "names" section contains the
function's alias rather than its original name
Patch by Nicholas Wilson!
Differential Revision: https://reviews.llvm.org/D42076
llvm-svn: 322751
See https://bugs.llvm.org/show_bug.cgi?id=35533, and D40844
Things covered:
* Removing duplicate data segments (as determined by COMDATs emitted
by the frontend)
* Removing duplicate globals and functions in COMDATs
* Checking that each time a COMDAT is seen it has the same symbols
as at other times (ie it's a stronger check than simply giving all
the symbols in the COMDAT weak linkage)
Patch by Nicholas Wilson!
Differential Revision: https://reviews.llvm.org/D40845
llvm-svn: 322415
The addresses of undefined symbols that make it into the final
executable (i.e. weak references to non-existent symbols) should
resolve to zero.
Also, make sure to not include function in the indirect function
table if they are not included in the output.
Differential Revision: https://reviews.llvm.org/D41839
llvm-svn: 322045
Add test for weakly defined symbols with the same name
Improve test for call-indirect to include the same call in two
different objects. This lays the ground work to improve the
output via de-duplicating the indirect call table:
https://reviews.llvm.org/D40989
Also make all tests consistently pass -mtriple rather than
declaring in the sources.
Differential Revision: https://reviews.llvm.org/D41024
llvm-svn: 320172
This change cleans up the way wasm exports and globals
are generated, particualrly for -r/--relocatable where
globals need to be created and exported in order for
output relocations which reference them.
Remove the need for a per file GlobalIndexOffset and
instead set the output index for each symbol directly.
This simplifies the code in several places.
Differential Revision: https://reviews.llvm.org/D40859
llvm-svn: 320001
This linker backend is still a work in progress but is
enough to link simple programs including linking against
library archives.
Differential Revision: https://reviews.llvm.org/D34851
llvm-svn: 318539
Sam Clegg