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When printing Binaryen IR, we previously generated names for unnamed heap types
based on their structure. This was useful for seeing the structure of simple
types at a glance without having to separately go look up their definitions, but
it also had two problems:
1. The same name could be generated for multiple types. The generated names did
not take into account rec group structure or finality, so types that differed
only in these properties would have the same name. Also, generated type names
were limited in length, so very large types that shared only some structure
could also end up with the same names. Using the same name for multiple types
produces incorrect and unparsable output.
2. The generated names were not useful beyond the most trivial examples. Even
with length limits, names for nontrivial types were extremely long and visually
noisy, which made reading disassembled real-world code more challenging.
Fix these problems by emitting simple indexed names for unnamed heap types
instead. This regresses readability for very simple examples, but the trade off
is worth it.
This change also reduces the number of type printing systems we have by one.
Previously we had the system in Print.cpp, but we had another, more general and
extensible system in wasm-type-printing.h and wasm-type.cpp as well. Remove the
old type printing system from Print.cpp and replace it with a much smaller use
of the new system. This requires significant refactoring of Print.cpp so that
PrintExpressionContents object now holds a reference to a parent
PrintSExpression object that holds the type name state.
This diff is very large because almost every test output changed slightly. To
minimize the diff and ease review, change the type printer in wasm-type.cpp to
behave the same as the old type printer in Print.cpp except for the differences
in name generation. These changes will be reverted in much smaller PRs in the
future to generally improve how types are printed.
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All top-level Module elements are identified and referred to by Name, but for
historical reasons element and data segments were referred to by index instead.
Fix this inconsistency by using Names to refer to segments from expressions that
use them. Also parse and print segment names like we do for other elements.
The C API is partially converted to use names instead of indices, but there are
still many functions that refer to data segments by index. Finishing the
conversion can be done in the future once it becomes necessary.
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This is no longer needed by emscripten as of:
https://github.com/emscripten-core/emscripten/pull/16529
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* Updating wasm.h/cpp for DataSegments
* Updating wasm-binary.h/cpp for DataSegments
* Removed link from Memory to DataSegments and updated module-utils, Metrics and wasm-traversal
* checking isPassive when copying data segments to know whether to construct the data segment with an offset or not
* Removing memory member var from DataSegment class as there is only one memory rn. Updated wasm-validator.cpp
* Updated wasm-interpreter
* First look at updating Passes
* Updated wasm-s-parser
* Updated files in src/ir
* Updating tools files
* Last pass on src files before building
* added visitDataSegment
* Fixing build errors
* Data segments need a name
* fixing var name
* ran clang-format
* Ensuring a name on DataSegment
* Ensuring more datasegments have names
* Adding explicit name support
* Fix fuzzing name
* Outputting data name in wasm binary only if explicit
* Checking temp dataSegments vector to validateBinary because it's the one with the segments before we processNames
* Pass on when data segment names are explicitly set
* Ran auto_update_tests.py and check.py, success all around
* Removed an errant semi-colon and corrected a counter. Everything still passes
* Linting
* Fixing processing memory names after parsed from binary
* Updating the test from the last fix
* Correcting error comment
* Impl kripken@ comments
* Impl tlively@ comments
* Updated tests that remove data print when == 0
* Ran clang format
* Impl tlively@ comments
* Ran clang-format
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See https://github.com/emscripten-core/emscripten/pull/15855
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As found in #3682, the current implementation of type ordering is not correct,
and although the immediate issue would be easy to fix, I don't think the current
intended comparison algorithm is correct in the first place. Rather than try to
switch to using a correct algorithm (which I am not sure I know how to
implement, although I have an idea) this PR removes Type ordering entirely. In
places that used Type ordering with std::set or std::map because they require
deterministic iteration order, this PR uses InsertOrdered{Set,Map} instead.
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Turns out just removing the mangling wasn't enough for
emscripten to support both before and after versions.
See https://github.com/WebAssembly/binaryen/pull/3785
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See https://github.com/emscripten-core/emscripten/issues/13893
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See https://github.com/emscripten-core/emscripten/pull/13847
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Emscripten no longer needs this information as of
https://github.com/emscripten-core/emscripten/pull/12643.
This also removes the need to export __data_end.
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The use of these passes was removed on the emscripten side
in https://github.com/emscripten-core/emscripten/pull/12536.
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These days we always export the table, except in the
case of dynamic linking, and even then we use the name
`__indirect_function_table`.
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The s-parser was assigning numbers names per-type where as
the binaryn reader was using the global import count as the
number to append.
This change switches to use per-element count which I think
it preferable as it increases the stability of the auto-generated
names. e.g. memory is now always named `$mimport0`.
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Implements the parts of the Extended Name Section Proposal that are trivially applicable to Binaryen, in particular table, memory and global names. Does not yet implement label, type, elem and data names.
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Doing it this way happens to re-order the __assign_got_entries
function in the module, but its otherwise NFC.
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To avoid the conditional trailing comma.
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This list is identical to the export list no there is no need to
output this twice.
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`BinaryIndexes` was only used in two places (Print.cpp and
wasm-binary.h), so it didn't seem to be a great fit for
module-utils.h. This change moves it to wasm-binary.h and removes its
usage in Print.cpp. This means that function indexes are no longer
printed, but those were of limited utility and were the source of
annoying noise when updating tests, anyway.
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Weak symbols and interposition etc. mean that we should not
replace an fp$ call with a symbol from the module itself if there
is a chance there is another symbol that would have overridden it.
In side modules this risk exists and so this PR makes us stop
doing that. In main modules it is ok because they are loaded
first and so any symbol they provide will "win" over others anyhow.
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Now that we update the dylink section properly, we can
do the same optimization in side modules as in main ones:
if the module provides a function, don't call an $fp method
during startup, instead add it to the table ourselves and use
the relative offset to the table base.
Fix an issue when the table has no segments initially: the
code just added an offset of 0, but that's not right. Instead,
an a __table_base import and use that as the offset. As
this is ABI-specific I did it on wasm-emscripten-finalize,
leaving TableUtils to just assert on having a singleton
segment.
Add a test of a wasm file with a dylink section to the lld tests.
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