================================================================================ wasm-split INFILES Split a module into a primary module and a secondary module, or instrument a module to gather a profile that can inform future splitting, or manage such profiles. Options that are only accepted in particular modes are marked with the accepted "[]" in their descriptions. ================================================================================ wasm-split options: ------------------- --split Split an input module into two output modules. The default mode. --multi-split Split an input module into an arbitrary number of output modules. --instrument Instrument an input module to allow it to generate a profile that can be used to guide splitting. --merge-profiles Merge multiple profiles for the same module into a single profile. --print-profile [print-profile] Print profile contents in a human-readable format. --profile [split] The profile to use to guide splitting. --keep-funcs [split] Comma-separated list of functions to keep in the primary module. The rest will be split out. Can be used alongside --profile and --split-funcs. You can also pass a file with one function per line by passing @filename. --split-funcs [split] Comma-separated list of functions to split out to the secondary module. The rest will be kept. Can be used alongside --profile and --keep-funcs. This takes precedence over other split options. You can also pass a file with one function per line by passing @filename. --manifest [multi-split] File describing the functions to be split into each module. Each section separated by a blank line begins with the base name of an output module, which is followed by a list of functions to place in that module, one per line. --out-prefix [multi-split] Prefix prepended to module names in the manifest file to create output file names. --primary-output,-o1 [split] Output file for the primary module. --secondary-output,-o2 [split] Output file for the secondary module. --symbolmap [split, multi-split] Write a symbol map file for each of the output modules. --no-placeholders [split, multi-split] Do not import placeholder functions. Calls to secondary functions will fail before the secondary module has been instantiated. --placeholdermap [split, multi-split] Write a file mapping placeholder indices to the function names. --import-namespace [split, multi-split, instrument] When provided as an option for module splitting, the namespace from which to import objects from the primary module into the secondary module. In instrument mode, refers to the namespace from which to import the secondary memory, if any. --placeholder-namespace-prefix [split, multi-split] The prefix for the namespaces from which to import placeholder functions into the primary module. The namespaces will be concatenations of the prefix and the module name. --placeholder-namespace [split, multi-split] The same as --placeholder-namespace-prefix. --export-prefix [split, multi-split] An identifying prefix to prepend to new export names created by module splitting. --profile-export [instrument] The export name of the function the embedder calls to write the profile into memory. Defaults to `__write_profile`. --in-memory [instrument] Store profile information in memory (starting at address 0 and taking one byte per function) rather than globals (the default) so that it can be shared between multiple threads. Users are responsible for ensuring that the module does not use the initial memory region for anything else. --in-secondary-memory [instrument] Store profile information in a separate memory, rather than in module main memory or globals (the default). With this option, users do not need to reserve the initial memory region for profile data and the data can be shared between multiple threads. --secondary-memory-name [instrument] The name of the secondary memory created to store profile information. --initial-table [split, instrument] A hack to ensure the split and instrumented modules have the same table size when using Emscripten's SPLIT_MODULE mode with dynamic linking. TODO: Figure out a more elegant solution for that use case and remove this. --emit-text,-S [split, multi-split, instrument] Emit text instead of binary for the output file or files. --debuginfo,-g [split, multi-split, instrument] Emit names section in wasm binary (or full debuginfo in wast) --strip-debug [split, multi-split, instrument] Strip debug info (including the names section) --traps-never-happen,-tnh [split, multi-split] Split under the helpful assumption that no trap is reached at runtime (from load, div/mod, etc.) --output,-o [instrument, merge-profiles, multi-split] Output file. --verbose,-v Verbose output mode. Prints the functions that will be kept and split out when splitting a module. Tool options: ------------- --mvp-features,-mvp Disable all non-MVP features --all-features,-all Enable all features --detect-features (deprecated - this flag does nothing) --quiet,-q Emit less verbose output and hide trivial warnings. --experimental-poppy Parse wast files as Poppy IR for testing purposes. --emit-module-names Emit module names, even if not emitting the rest of the names section. --enable-sign-ext Enable sign extension operations --disable-sign-ext Disable sign extension operations --enable-threads Enable atomic operations --disable-threads Disable atomic operations --enable-mutable-globals Enable mutable globals --disable-mutable-globals Disable mutable globals --enable-nontrapping-float-to-int Enable nontrapping float-to-int operations --disable-nontrapping-float-to-int Disable nontrapping float-to-int operations --enable-simd Enable SIMD operations and types --disable-simd Disable SIMD operations and types --enable-bulk-memory Enable bulk memory operations --disable-bulk-memory Disable bulk memory operations --enable-bulk-memory-opt Enable memory.copy and memory.fill --disable-bulk-memory-opt Disable memory.copy and memory.fill --enable-call-indirect-overlong Enable LEB encoding of call-indirect (Ignored for compatibility as it has no effect on Binaryen) --disable-call-indirect-overlong Disable LEB encoding of call-indirect (Ignored for compatibility as it has no effect on Binaryen) --enable-exception-handling Enable exception handling operations --disable-exception-handling Disable exception handling operations --enable-tail-call Enable tail call operations --disable-tail-call Disable tail call operations --enable-reference-types Enable reference types --disable-reference-types Disable reference types --enable-multivalue Enable multivalue functions --disable-multivalue Disable multivalue functions --enable-gc Enable garbage collection --disable-gc Disable garbage collection --enable-memory64 Enable memory64 --disable-memory64 Disable memory64 --enable-relaxed-simd Enable relaxed SIMD --disable-relaxed-simd Disable relaxed SIMD --enable-extended-const Enable extended const expressions --disable-extended-const Disable extended const expressions --enable-strings Enable strings --disable-strings Disable strings --enable-multimemory Enable multimemory --disable-multimemory Disable multimemory --enable-stack-switching Enable stack switching --disable-stack-switching Disable stack switching --enable-shared-everything Enable shared-everything threads --disable-shared-everything Disable shared-everything threads --enable-fp16 Enable float 16 operations --disable-fp16 Disable float 16 operations --enable-custom-descriptors Enable custom descriptors (RTTs) and exact references --disable-custom-descriptors Disable custom descriptors (RTTs) and exact references --enable-multibyte Enable multibyte array loads and stores --disable-multibyte Disable multibyte array loads and stores --enable-acquire-release-atomics Enable acquire/release atomic memory operations --disable-acquire-release-atomics Disable acquire/release atomic memory operations --enable-custom-page-sizes Enable custom page sizes --disable-custom-page-sizes Disable custom page sizes --enable-wide-arithmetic Enable wide arithmetic --disable-wide-arithmetic Disable wide arithmetic --enable-compact-imports Enable compact import section --disable-compact-imports Disable compact import section --enable-relaxed-atomics Enable relaxed atomic memory operations --disable-relaxed-atomics Disable relaxed atomic memory operations --enable-typed-function-references Deprecated compatibility flag --disable-typed-function-references Deprecated compatibility flag --no-validation,-n Disables validation, assumes inputs are correct --pass-arg,-pa An argument passed along to optimization passes being run. Must be in the form KEY@VALUE. If KEY is the name of a pass then it applies to the closest instance of that pass before us. If KEY is not the name of a pass then it is a global option that applies to all pass instances that read it. --closed-world,-cw Assume code outside of the module does not inspect or interact with GC and function references, even if they are passed out. The outside may hold on to them and pass them back in, but not inspect their contents or call them. --preserve-type-order Preserve the order of types from the input (useful for debugging and testing) --generate-stack-ir generate StackIR during writing --optimize-stack-ir optimize StackIR during writing --print-stack-ir print StackIR during writing General options: ---------------- --version Output version information and exit --help,-h Show this help message and exit --debug,-d Print debug information to stderr