wasi-libc

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Author SHA1 Message Date

Author	SHA1	Message	Date
Dan Gohman	446cb3f1aa	Wasi snapshot preview1 (#140 ) * Make __wasi_linkcount_t a uint64_t (#134) Refs: https://github.com/WebAssembly/WASI/pull/127 * Generate the WASI interface from witx. This replaces the hand-maintained <wasi/core.h> header with a <wasi/api.h> generated from witx. Most of the churn here is caused by upstream WASI renamings; hopefully in the future ABI updates will be less noisy.	2019-11-21 20:06:00 -08:00
Dan Gohman	cf366c06d1	Optimize lseek in the `tell` case. `lseek(x, 0, SEEK_CUR)` has no effect other than to return the current file offset. The patch here uses a macro with `__builtin_constant_p` to recognize this case and rewrite it to a library call that uses `fd_tell` rather than `fd_seek`, so that programs that don't need actual seeking don't end up importing `fd_seek`. This is also the first usage of `__wasi_fd_tell` in WASI libc, so this adds it to undefined-symbols.txt.	2019-04-30 16:19:05 -07:00

Dan Gohman

446cb3f1aa

Wasi snapshot preview1 (#140 )

* Make __wasi_linkcount_t a uint64_t (#134)

Refs: https://github.com/WebAssembly/WASI/pull/127

* Generate the WASI interface from witx.

This replaces the hand-maintained <wasi/core.h> header with a
<wasi/api.h> generated from witx.

Most of the churn here is caused by upstream WASI renamings; hopefully
in the future ABI updates will be less noisy.

2019-11-21 20:06:00 -08:00

Dan Gohman

cf366c06d1

Optimize lseek in the tell case.

`lseek(x, 0, SEEK_CUR)` has no effect other than to return the current
file offset. The patch here uses a macro with `__builtin_constant_p` to
recognize this case and rewrite it to a library call that uses `fd_tell`
rather than `fd_seek`, so that programs that don't need actual seeking
don't end up importing `fd_seek`.

This is also the first usage of `__wasi_fd_tell` in WASI libc, so this
adds it to undefined-symbols.txt.

2019-04-30 16:19:05 -07:00

2 Commits