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littledan
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Mar 4, 2018
See comments in WebAssembly#24: * Throw an error when constructing shared memory without maximum. * Lazily create a new SharedArrayBuffer and freeze it after grow.
eqrion
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Sep 18, 2019
alexcrichton
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Nov 18, 2019
This change adds a variable shuffle instruction to SIMD proposal. When indices are out of range, the result is specified as 0 for each lane. This matches hardware behavior on ARM and RISCV architectures. On x86_64 and MIPS, the hardware provides instructions that can select 0 when the high bit is set to 1 (x86_64) or any of the two high bits are set to 1 (MIPS). On these architectures, the backend is expected to emit a pair of instructions, saturating add (saturate(x + (128 - 16)) for x86_64) and permute, to emulate the proposed behavior. To distinguish variable shuffles with immediate shuffles, existing v8x16.shuffle instruction is renamed to v8x16.shuffle2_imm to be explicit about the fact that it shuffles two vectors with an immediate argument. This naming scheme allows for adding variants like v8x16.shuffle2 and v8x16.shuffle1_imm in the future. Fixes WebAssembly#68. Contributes to WebAssembly#24. Fixes WebAssembly#11.
alexcrichton
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Nov 19, 2019
Update Explainer strawman text format to conform to Custom Annotation Syntax
ErikMcClure
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Jun 15, 2020
This also fixes nearby cross-references. Fixes WebAssembly#24.
dhil
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Mar 9, 2023
This commit refactors the file `cont.wast` such that it no longer uses `let` and `func.bind`. We change the type of `spawn` such that it is parameterised by a continuation type rather than a function type, and then we replace every use of `func.bind` by a corresponding `cont.bind`.
backes
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Jul 12, 2023
dhil
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Oct 3, 2023
Fix duplicated 'add's in README.md
dhil
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Feb 12, 2024
Merge with WebAssembly/main
rossberg
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Sep 4, 2024
rossberg
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Sep 11, 2025
* Initial commit
* Initial setup and overview
* Update proposal
* Adopts builtin modules approach
* Adds section of polyfilling
* Adds section on feature detection
* Adds cast/test builtins
* Adds future extension ideas for
- binding memory
- utf8/wtf8
- evolving the type signatures
* Address review feedback
* Rename concatenate to concat
* Editorial changes
- Eliminate usage of 'builtin module' in description. This is not essential to the proposal and
causes confusion around a similarly named JS proposal, which had different goals.
- Clarify some minor points.
- Make JS-API changes to WebIDL comprehensive.
- Reword feature detection section to actually propose change to WebAssembly.validate method
* Tighten up definitions of function builtins
- Function builtin behaviors is defined using 'create a host function'
- Clarify behavior around monkey patching using standard language
- Clarify edge cases around nullability
- Clarify edge cases around unsigned/signed integers
- Restrict 'substring' behavior to normal cases
- Use wasm helpers for when wasm instructions are needed
* Rework support for WTF-8
The existing WTF-8 operation in this proposal violated one of the goals of the
proposal: "don't create substantial new functionality" by introducing WTF-8
transcoding support to the web platform without prior precedent. The WTF-8
operation is removed because of this.
The naming for WTF-16 operations is reworked to refer to 'charCodes' instead
as that is what the JS String interface uses.
We could support UTF-8 transcoding by referring to the TextEncoder/TextDecoder
interfaces, so this commit adds support for that.
* Review comments
* Update substring range checking
* Fix mutability of array i8
Fixes #19.
* Add streaming-related functions
Fixes #19
* Clarify behavior of flags and function names
Fixes #17.
* Fix link to type-imports prposal in js-string-builtins/Overview.md
* Clarify feature detection scheme
Explain that users should validate modules that deliberately produce link errors to test for support for particular builtins.
* Add test for js-string-builtins
This commit adds a basic suite of tests for the js-string-builtins.
This is done by defining a polyfill module matching the overview,
and then comparing the host provided builtins against the polyfill
on representative inputs.
* Fix type signature of 'concat'
Fixes #24.
* Add section on string constants, including Struct.from
* Rework to use imported string constants idea
* Fixup typos
* Add missing start parameter to measureStringAsUTF8 overview
* Update Overview.md
* Many small improvements
- Syntax highlighting
- Added links
- Code font
- Consistency
- Grammer fixes
* Update proposals/js-string-builtins/Overview.md
* Fix nullability for string constants
* Expand section on string constants
* Revert unintentional change to builtins field
* Add note about empty imports object
* Initial outline of builtin support
* Expand specification of builtins
* Remove unneeded modification to embedding spec
* Initial string constants support
* Fix module constructor to handle options
* Don't freeze internal instantiation of builtins and string constants
* Move UTF-8 support to a future proposal
* Remove DS_Store
* Remove DS_Store
* Mark up options appropriately
* Make UnwrapString an abstract-op and use it to implement cast
* Consistently use "steps" instead of "algorithm" for builtins
* Add test
* Add stubs for the rest of the operations
* Add fromCharCode
* Switch to using the Call abstract op, and add fromCodePoint
* Add length
* Add charCodeAt and codePointAt
* Add concat
* Add substring
* Use angle quotes appropriately
* Add basic support for fromCharCodeArray
Needs more detail to properly integrate with GC array ops.
* Make fromCharCodeArray slightly less formal
This avoids having to refer to actual Wasm instructions,
since after all this is a host function.
* Add intoCharCodeArray
* Add equals and compare
* Review fixes for builtin steps
* Tweak wording for trapping in builtins
* Fix spec to separate builtin name used for imports and compile options
* Add note about patching the String builtins
* Add more tests
* Don't validate that every builtin set option is valid
* Fix null-handling for `equals` in test and polyfill
Equals specifically allows null inputs. Update the JS API tests
and the polyfill to match.
* Editorial: replace Type AO with new ECMA-262 type test convention
* actually remove Type
* support per-component polyfill fallbacks
* spec rework
* typo
* Editorial: Align with Web IDL specification
* [js-api] Fix incorrect return statement in 'validate builtin set names'
* [js-api] Remove copy-pasted if statements
* Revert changes to conf and README to prepare for merging
* [tests] Remove tentative from js-string tests
* Expand JS builtin functypes
* Add change history entry
* [js-api] Improve formatting
---------
Co-authored-by: Deepti Gandluri <dtig@users.noreply.github.com>
Co-authored-by: Martin Kustermann <kustermann@google.com>
Co-authored-by: Thomas Lively <tlively@google.com>
Co-authored-by: Ömer Sinan Ağacan <omeragacan@gmail.com>
Co-authored-by: Thomas Steiner <tomac@google.com>
Co-authored-by: Adam Klein <adamk@chromium.org>
Co-authored-by: Michael Ficarra <m.ficarra@f5.com>
Co-authored-by: Guy Bedford <guybedford@gmail.com>
Co-authored-by: autokagami <saschanaz+autokagami@outlook.com>
CharlieTap
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Sep 25, 2025
…istings Add Rust toolchain under implementation status
stevenfontanella
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Nov 12, 2025
spec:
WebAssembly@bcb6a41b
threads:
WebAssembly/threads@50680261
simd:
WebAssembly/simd@68d23f85
annotations:
WebAssembly/annotations@318622f0
This change was automatically generated by `update-testsuite.sh`
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