It seems redundant to store this information twice. None of the
locations where this bit is checked care about the distinction.
Differential Revision: https://reviews.llvm.org/D43250
llvm-svn: 325046
This is similar to _end (See https://linux.die.net/man/3/edata for more)
but using our own unique name since our use cases will most likely be
different and we want to keep our options open WRT to memory layout.
This change will allow is to remove the DataSize from the linking
metadata section which is currently being used by emscripten to derive
the end of the data.
Differential Revision: https://reviews.llvm.org/D42867
llvm-svn: 324443
Group all synthetic symbols in the in single struct to match
the ELF linker.
This change is part of a larger change to add more linker
symbols such as `_end` and `_edata`.
Differential Revision: https://reviews.llvm.org/D42866
llvm-svn: 324157
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
In this initial version we only GC symbols with `hidden` visibility since
other symbols we export to the embedder.
We could potentially modify this the future and only use symbols
explicitly passed via `--export` as GC roots.
This version of the code only does GC of data and code. GC for the
types section is coming soon.
Differential Revision: https://reviews.llvm.org/D42511
llvm-svn: 323842
Summary:
Rather than explicit Function or InputSegment points store a
pointer to the base class (InputChunk) and use llvm dynamic
casts when we need a subtype.
This change is useful for add the upcoming gc-section support
wants to deal with all input chunks.
Subscribers: aheejin, llvm-commits
Differential Revision: https://reviews.llvm.org/D42625
llvm-svn: 323621
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
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
This was added to mimic ELF, but maintaining it has cost
and we currently don't have any use for it outside of the
test code.
Differential Revision: https://reviews.llvm.org/D42324
llvm-svn: 323154
Its much easier to export it via setHidden(false), now that
that is a thing.
As a side effect the start function is not longer always exports first
(becuase its being exported just like all the other function).
Differential Revision: https://reviews.llvm.org/D42321
llvm-svn: 323025
We need these import since relocations are generated against them.
Patch by Nicholas Wilson!
Differential Revision: https://reviews.llvm.org/D42305
llvm-svn: 322990
This solves the problem that --emit-relocs needs the stack-pointer
to be exported, in order to write out any relocations that reference
the __stack_pointer symbol by its symbol index.
Patch by Nicholas Wilson!
Differential Revision: https://reviews.llvm.org/D42237
llvm-svn: 322911
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
This is an immutable exported global representing
the start of the heap area. It is a page aligned.
Differential Revision: https://reviews.llvm.org/D42030
llvm-svn: 322609
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
Even though a function can have multiple names in the
linking standards (i.e. due to aliases), there can only
be one name for a given function in the NAME section.
Differential Revision: https://reviews.llvm.org/D41975
llvm-svn: 322383
The code section is now written out one function
at a time rather than all the functions in a given
objects being serialized at once.
This change lays the groundwork for supporting
--gc-sections.
Differential Revision: https://reviews.llvm.org/D41315
llvm-svn: 322138
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
This change add support for init functions in the linking
section, but only in -r/--relocatable mode.
Differential Revision: https://reviews.llvm.org/D41375
llvm-svn: 321088
This is a preparetory change for function gc which also
requires relocations to be copied in ranges like this.
Differential Revision: https://reviews.llvm.org/D41313
llvm-svn: 320948
Since imports are undefined symbols we know we can
find all of them my looking at the symbol table alone.
(i.e. imports cannot be have local binding).
This will be strictly faster and also allows us
to to remove a method from Symbol class
Differential Revision: https://reviews.llvm.org/D41304
llvm-svn: 320847
Create the indirect function table based on symbols rather
than just duplicating the input entries. This has the
effect of de-duplicating the table.
This is a followup to the equivalent change made for globals:
https://reviews.llvm.org/D40859
Partially based on a patch by Nicholas Wilson:
https://reviews.llvm.org/D40845
Differential Revision: https://reviews.llvm.org/D40989
llvm-svn: 320428
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 is part of larger change to add synthetic symbols
for section start/end points and init/fini_array:
https://reviews.llvm.org/D40760
Allows synthetic global symbols to have an explicitly set
virtual address.
Differential Revision: https://reviews.llvm.org/D40843
llvm-svn: 319813
This is a small change I split of from a larger one
that simplifies the condition that need to be checked
when decided if we need to emit relocation and all the
things they depend on (symbols, etc).
Differential Revision: https://reviews.llvm.org/D40825
llvm-svn: 319789
Sam Clegg