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Migrate back to std:: stylistically (#554)

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* Migrate back to `std::` stylistically

This commit moves away from idioms such as `alloc::` and `core::` as
imports of standard data structures and types. Instead it migrates all
crates to uniformly use `std::` for importing standard data structures
and types. This also removes the `std` and `core` features from all
crates to and removes any conditional checking for `feature = "std"`

All of this support was previously added in #407 in an effort to make
wasmtime/cranelift "`no_std` compatible". Unfortunately though this
change comes at a cost:

* The usage of `alloc` and `core` isn't idiomatic. Especially trying to
  dual between types like `HashMap` from `std` as well as from
  `hashbrown` causes imports to be surprising in some cases.
* Unfortunately there was no CI check that crates were `no_std`, so none
  of them actually were. Many crates still imported from `std` or
  depended on crates that used `std`.

It's important to note, however, that **this does not mean that wasmtime
will not run in embedded environments**. The style of the code today and
idioms aren't ready in Rust to support this degree of multiplexing and
makes it somewhat difficult to keep up with the style of `wasmtime`.
Instead it's intended that embedded runtime support will be added as
necessary. Currently only `std` is necessary to build `wasmtime`, and
platforms that natively need to execute `wasmtime` will need to use a
Rust target that supports `std`. Note though that not all of `std` needs
to be supported, but instead much of it could be configured off to
return errors, and `wasmtime` would be configured to gracefully handle
errors.

The goal of this PR is to move `wasmtime` back to idiomatic usage of
features/`std`/imports/etc and help development in the short-term.
Long-term when platform concerns arise (if any) they can be addressed by
moving back to `no_std` crates (but fixing the issues mentioned above)
or ensuring that the target in Rust has `std` available.

* Start filling out platform support doc
This commit is contained in:
Alex Crichton
2019-11-19 00:04:06 -06:00
committed by Dan Gohman
parent c423a1c2f0
commit 39e57e3e9a
99 changed files with 271 additions and 444 deletions
Download Patch File Download Diff File Expand all files Collapse all files

111
crates/wasi-c/src/wasm32.rs
View File

@@ -108,7 +108,7 @@ fn bindgen_test_layout_fsid_t() {
concat!("Alignment of ", stringify!(fsid_t))
);
assert_eq!(
unsafe { &(*(::core::ptr::null::<fsid_t>())).__val as *const _ as usize },
unsafe { &(*(std::ptr::null::<fsid_t>())).__val as *const _ as usize },
0usize,
concat!(
"Offset of field: ",
@@ -167,7 +167,7 @@ fn bindgen_test_layout_wasi_dirent_t() {
concat!("Size of: ", stringify!(__wasi_dirent_t))
);
assert_eq!(
unsafe { &(*(::core::ptr::null::<__wasi_dirent_t>())).d_next as *const _ as usize },
unsafe { &(*(std::ptr::null::<__wasi_dirent_t>())).d_next as *const _ as usize },
0usize,
concat!(
"Offset of field: ",
@@ -177,7 +177,7 @@ fn bindgen_test_layout_wasi_dirent_t() {
)
);
assert_eq!(
unsafe { &(*(::core::ptr::null::<__wasi_dirent_t>())).d_ino as *const _ as usize },
unsafe { &(*(std::ptr::null::<__wasi_dirent_t>())).d_ino as *const _ as usize },
8usize,
concat!(
"Offset of field: ",
@@ -187,7 +187,7 @@ fn bindgen_test_layout_wasi_dirent_t() {
)
);
assert_eq!(
unsafe { &(*(::core::ptr::null::<__wasi_dirent_t>())).d_namlen as *const _ as usize },
unsafe { &(*(std::ptr::null::<__wasi_dirent_t>())).d_namlen as *const _ as usize },
16usize,
concat!(
"Offset of field: ",
@@ -197,7 +197,7 @@ fn bindgen_test_layout_wasi_dirent_t() {
)
);
assert_eq!(
unsafe { &(*(::core::ptr::null::<__wasi_dirent_t>())).d_type as *const _ as usize },
unsafe { &(*(std::ptr::null::<__wasi_dirent_t>())).d_type as *const _ as usize },
20usize,
concat!(
"Offset of field: ",
@@ -249,7 +249,7 @@ fn bindgen_test_layout___wasi_event_t___wasi_event_u___wasi_event_u_fd_readwrite
);
assert_eq!(
unsafe {
&(*(::core::ptr::null::<__wasi_event_t___wasi_event_u___wasi_event_u_fd_readwrite_t>()))
&(*(std::ptr::null::<__wasi_event_t___wasi_event_u___wasi_event_u_fd_readwrite_t>()))
.nbytes as *const _ as usize
},
0usize,
@@ -262,7 +262,7 @@ fn bindgen_test_layout___wasi_event_t___wasi_event_u___wasi_event_u_fd_readwrite
);
assert_eq!(
unsafe {
&(*(::core::ptr::null::<__wasi_event_t___wasi_event_u___wasi_event_u_fd_readwrite_t>()))
&(*(std::ptr::null::<__wasi_event_t___wasi_event_u___wasi_event_u_fd_readwrite_t>()))
.flags as *const _ as usize
},
8usize,
@@ -288,7 +288,7 @@ fn bindgen_test_layout___wasi_event_t___wasi_event_u() {
);
assert_eq!(
unsafe {
&(*(::core::ptr::null::<__wasi_event_t___wasi_event_u>())).fd_readwrite as *const _
&(*(std::ptr::null::<__wasi_event_t___wasi_event_u>())).fd_readwrite as *const _
as usize
},
0usize,
@@ -313,7 +313,7 @@ fn bindgen_test_layout___wasi_event_t() {
concat!("Alignment of ", stringify!(__wasi_event_t))
);
assert_eq!(
unsafe { &(*(::core::ptr::null::<__wasi_event_t>())).userdata as *const _ as usize },
unsafe { &(*(std::ptr::null::<__wasi_event_t>())).userdata as *const _ as usize },
0usize,
concat!(
"Offset of field: ",
@@ -323,7 +323,7 @@ fn bindgen_test_layout___wasi_event_t() {
)
);
assert_eq!(
unsafe { &(*(::core::ptr::null::<__wasi_event_t>())).error as *const _ as usize },
unsafe { &(*(std::ptr::null::<__wasi_event_t>())).error as *const _ as usize },
8usize,
concat!(
"Offset of field: ",
@@ -333,7 +333,7 @@ fn bindgen_test_layout___wasi_event_t() {
)
);
assert_eq!(
unsafe { &(*(::core::ptr::null::<__wasi_event_t>())).type_ as *const _ as usize },
unsafe { &(*(std::ptr::null::<__wasi_event_t>())).type_ as *const _ as usize },
10usize,
concat!(
"Offset of field: ",
@@ -343,7 +343,7 @@ fn bindgen_test_layout___wasi_event_t() {
)
);
assert_eq!(
unsafe { &(*(::core::ptr::null::<__wasi_event_t>())).u as *const _ as usize },
unsafe { &(*(std::ptr::null::<__wasi_event_t>())).u as *const _ as usize },
16usize,
concat!(
"Offset of field: ",
@@ -389,7 +389,7 @@ fn bindgen_test_layout___wasi_prestat_t___wasi_prestat_u___wasi_prestat_u_dir_t(
);
assert_eq!(
unsafe {
&(*(::core::ptr::null::<__wasi_prestat_t___wasi_prestat_u___wasi_prestat_u_dir_t>()))
&(*(std::ptr::null::<__wasi_prestat_t___wasi_prestat_u___wasi_prestat_u_dir_t>()))
.pr_name_len as *const _ as usize
},
0usize,
@@ -418,7 +418,7 @@ fn bindgen_test_layout___wasi_prestat_t___wasi_prestat_u() {
);
assert_eq!(
unsafe {
&(*(::core::ptr::null::<__wasi_prestat_t___wasi_prestat_u>())).dir as *const _ as usize
&(*(std::ptr::null::<__wasi_prestat_t___wasi_prestat_u>())).dir as *const _ as usize
},
0usize,
concat!(
@@ -442,7 +442,7 @@ fn bindgen_test_layout___wasi_prestat_t() {
concat!("Alignment of ", stringify!(__wasi_prestat_t))
);
assert_eq!(
unsafe { &(*(::core::ptr::null::<__wasi_prestat_t>())).pr_type as *const _ as usize },
unsafe { &(*(std::ptr::null::<__wasi_prestat_t>())).pr_type as *const _ as usize },
0usize,
concat!(
"Offset of field: ",
@@ -452,7 +452,7 @@ fn bindgen_test_layout___wasi_prestat_t() {
)
);
assert_eq!(
unsafe { &(*(::core::ptr::null::<__wasi_prestat_t>())).u as *const _ as usize },
unsafe { &(*(std::ptr::null::<__wasi_prestat_t>())).u as *const _ as usize },
4usize,
concat!(
"Offset of field: ",
@@ -489,8 +489,8 @@ fn bindgen_test_layout_wasi_event_t__bindgen_ty_1__bindgen_ty_1() {
);
assert_eq!(
unsafe {
&(*(::core::ptr::null::<__wasi_event_t__bindgen_ty_1__bindgen_ty_1>())).nbytes
as *const _ as usize
&(*(std::ptr::null::<__wasi_event_t__bindgen_ty_1__bindgen_ty_1>())).nbytes as *const _
as usize
},
0usize,
concat!(
@@ -502,8 +502,8 @@ fn bindgen_test_layout_wasi_event_t__bindgen_ty_1__bindgen_ty_1() {
);
assert_eq!(
unsafe {
&(*(::core::ptr::null::<__wasi_event_t__bindgen_ty_1__bindgen_ty_1>())).flags
as *const _ as usize
&(*(std::ptr::null::<__wasi_event_t__bindgen_ty_1__bindgen_ty_1>())).flags as *const _
as usize
},
8usize,
concat!(
@@ -541,8 +541,8 @@ fn bindgen_test_layout_wasi_event_t__bindgen_ty_1__bindgen_ty_2() {
);
assert_eq!(
unsafe {
&(*(::core::ptr::null::<__wasi_event_t__bindgen_ty_1__bindgen_ty_2>())).signal
as *const _ as usize
&(*(std::ptr::null::<__wasi_event_t__bindgen_ty_1__bindgen_ty_2>())).signal as *const _
as usize
},
0usize,
concat!(
@@ -554,7 +554,7 @@ fn bindgen_test_layout_wasi_event_t__bindgen_ty_1__bindgen_ty_2() {
);
assert_eq!(
unsafe {
&(*(::core::ptr::null::<__wasi_event_t__bindgen_ty_1__bindgen_ty_2>())).exitcode
&(*(std::ptr::null::<__wasi_event_t__bindgen_ty_1__bindgen_ty_2>())).exitcode
as *const _ as usize
},
4usize,
@@ -576,8 +576,7 @@ fn bindgen_test_layout_wasi_event_t__bindgen_ty_1() {
);
assert_eq!(
unsafe {
&(*(::core::ptr::null::<__wasi_event_t__bindgen_ty_1>())).fd_readwrite as *const _
as usize
&(*(std::ptr::null::<__wasi_event_t__bindgen_ty_1>())).fd_readwrite as *const _ as usize
},
0usize,
concat!(
@@ -596,7 +595,7 @@ fn bindgen_test_layout_wasi_event_t() {
concat!("Size of: ", stringify!(__wasi_event_t))
);
assert_eq!(
unsafe { &(*(::core::ptr::null::<__wasi_event_t>())).userdata as *const _ as usize },
unsafe { &(*(std::ptr::null::<__wasi_event_t>())).userdata as *const _ as usize },
0usize,
concat!(
"Offset of field: ",
@@ -606,7 +605,7 @@ fn bindgen_test_layout_wasi_event_t() {
)
);
assert_eq!(
unsafe { &(*(::core::ptr::null::<__wasi_event_t>())).error as *const _ as usize },
unsafe { &(*(std::ptr::null::<__wasi_event_t>())).error as *const _ as usize },
8usize,
concat!(
"Offset of field: ",
@@ -616,7 +615,7 @@ fn bindgen_test_layout_wasi_event_t() {
)
);
assert_eq!(
unsafe { &(*(::core::ptr::null::<__wasi_event_t>())).type_ as *const _ as usize },
unsafe { &(*(std::ptr::null::<__wasi_event_t>())).type_ as *const _ as usize },
10usize,
concat!(
"Offset of field: ",
@@ -643,7 +642,7 @@ fn bindgen_test_layout_wasi_fdstat_t() {
concat!("Size of: ", stringify!(__wasi_fdstat_t))
);
assert_eq!(
unsafe { &(*(::core::ptr::null::<__wasi_fdstat_t>())).fs_filetype as *const _ as usize },
unsafe { &(*(std::ptr::null::<__wasi_fdstat_t>())).fs_filetype as *const _ as usize },
0usize,
concat!(
"Offset of field: ",
@@ -653,7 +652,7 @@ fn bindgen_test_layout_wasi_fdstat_t() {
)
);
assert_eq!(
unsafe { &(*(::core::ptr::null::<__wasi_fdstat_t>())).fs_flags as *const _ as usize },
unsafe { &(*(std::ptr::null::<__wasi_fdstat_t>())).fs_flags as *const _ as usize },
2usize,
concat!(
"Offset of field: ",
@@ -663,7 +662,7 @@ fn bindgen_test_layout_wasi_fdstat_t() {
)
);
assert_eq!(
unsafe { &(*(::core::ptr::null::<__wasi_fdstat_t>())).fs_rights_base as *const _ as usize },
unsafe { &(*(std::ptr::null::<__wasi_fdstat_t>())).fs_rights_base as *const _ as usize },
8usize,
concat!(
"Offset of field: ",
@@ -674,7 +673,7 @@ fn bindgen_test_layout_wasi_fdstat_t() {
);
assert_eq!(
unsafe {
&(*(::core::ptr::null::<__wasi_fdstat_t>())).fs_rights_inheriting as *const _ as usize
&(*(std::ptr::null::<__wasi_fdstat_t>())).fs_rights_inheriting as *const _ as usize
},
16usize,
concat!(
@@ -705,7 +704,7 @@ fn bindgen_test_layout_wasi_filestat_t() {
concat!("Size of: ", stringify!(__wasi_filestat_t))
);
assert_eq!(
unsafe { &(*(::core::ptr::null::<__wasi_filestat_t>())).st_dev as *const _ as usize },
unsafe { &(*(std::ptr::null::<__wasi_filestat_t>())).st_dev as *const _ as usize },
0usize,
concat!(
"Offset of field: ",
@@ -715,7 +714,7 @@ fn bindgen_test_layout_wasi_filestat_t() {
)
);
assert_eq!(
unsafe { &(*(::core::ptr::null::<__wasi_filestat_t>())).st_ino as *const _ as usize },
unsafe { &(*(std::ptr::null::<__wasi_filestat_t>())).st_ino as *const _ as usize },
8usize,
concat!(
"Offset of field: ",
@@ -725,7 +724,7 @@ fn bindgen_test_layout_wasi_filestat_t() {
)
);
assert_eq!(
unsafe { &(*(::core::ptr::null::<__wasi_filestat_t>())).st_filetype as *const _ as usize },
unsafe { &(*(std::ptr::null::<__wasi_filestat_t>())).st_filetype as *const _ as usize },
16usize,
concat!(
"Offset of field: ",
@@ -735,7 +734,7 @@ fn bindgen_test_layout_wasi_filestat_t() {
)
);
assert_eq!(
unsafe { &(*(::core::ptr::null::<__wasi_filestat_t>())).st_nlink as *const _ as usize },
unsafe { &(*(std::ptr::null::<__wasi_filestat_t>())).st_nlink as *const _ as usize },
20usize,
concat!(
"Offset of field: ",
@@ -745,7 +744,7 @@ fn bindgen_test_layout_wasi_filestat_t() {
)
);
assert_eq!(
unsafe { &(*(::core::ptr::null::<__wasi_filestat_t>())).st_size as *const _ as usize },
unsafe { &(*(std::ptr::null::<__wasi_filestat_t>())).st_size as *const _ as usize },
24usize,
concat!(
"Offset of field: ",
@@ -755,7 +754,7 @@ fn bindgen_test_layout_wasi_filestat_t() {
)
);
assert_eq!(
unsafe { &(*(::core::ptr::null::<__wasi_filestat_t>())).st_atim as *const _ as usize },
unsafe { &(*(std::ptr::null::<__wasi_filestat_t>())).st_atim as *const _ as usize },
32usize,
concat!(
"Offset of field: ",
@@ -765,7 +764,7 @@ fn bindgen_test_layout_wasi_filestat_t() {
)
);
assert_eq!(
unsafe { &(*(::core::ptr::null::<__wasi_filestat_t>())).st_mtim as *const _ as usize },
unsafe { &(*(std::ptr::null::<__wasi_filestat_t>())).st_mtim as *const _ as usize },
40usize,
concat!(
"Offset of field: ",
@@ -775,7 +774,7 @@ fn bindgen_test_layout_wasi_filestat_t() {
)
);
assert_eq!(
unsafe { &(*(::core::ptr::null::<__wasi_filestat_t>())).st_ctim as *const _ as usize },
unsafe { &(*(std::ptr::null::<__wasi_filestat_t>())).st_ctim as *const _ as usize },
48usize,
concat!(
"Offset of field: ",
@@ -804,7 +803,7 @@ fn bindgen_test_layout_wasi_ciovec_t() {
concat!("Alignment of ", stringify!(__wasi_ciovec_t))
);
assert_eq!(
unsafe { &(*(::core::ptr::null::<__wasi_ciovec_t>())).buf as *const _ as usize },
unsafe { &(*(std::ptr::null::<__wasi_ciovec_t>())).buf as *const _ as usize },
0usize,
concat!(
"Offset of field: ",
@@ -814,7 +813,7 @@ fn bindgen_test_layout_wasi_ciovec_t() {
)
);
assert_eq!(
unsafe { &(*(::core::ptr::null::<__wasi_ciovec_t>())).buf_len as *const _ as usize },
unsafe { &(*(std::ptr::null::<__wasi_ciovec_t>())).buf_len as *const _ as usize },
4usize,
concat!(
"Offset of field: ",
@@ -843,7 +842,7 @@ fn bindgen_test_layout_wasi_iovec_t() {
concat!("Alignment of ", stringify!(__wasi_iovec_t))
);
assert_eq!(
unsafe { &(*(::core::ptr::null::<__wasi_iovec_t>())).buf as *const _ as usize },
unsafe { &(*(std::ptr::null::<__wasi_iovec_t>())).buf as *const _ as usize },
0usize,
concat!(
"Offset of field: ",
@@ -853,7 +852,7 @@ fn bindgen_test_layout_wasi_iovec_t() {
)
);
assert_eq!(
unsafe { &(*(::core::ptr::null::<__wasi_iovec_t>())).buf_len as *const _ as usize },
unsafe { &(*(std::ptr::null::<__wasi_iovec_t>())).buf_len as *const _ as usize },
4usize,
concat!(
"Offset of field: ",
@@ -914,7 +913,7 @@ fn bindgen_test_layout___wasi_subscription_t___wasi_subscription_u___wasi_subscr
);
assert_eq!(
unsafe {
&(*(::core::ptr::null::<
&(*(std::ptr::null::<
__wasi_subscription_t___wasi_subscription_u___wasi_subscription_u_clock_t,
>()))
.identifier as *const _ as usize
@@ -929,7 +928,7 @@ fn bindgen_test_layout___wasi_subscription_t___wasi_subscription_u___wasi_subscr
);
assert_eq!(
unsafe {
&(*(::core::ptr::null::<
&(*(std::ptr::null::<
__wasi_subscription_t___wasi_subscription_u___wasi_subscription_u_clock_t,
>()))
.clock_id as *const _ as usize
@@ -944,7 +943,7 @@ fn bindgen_test_layout___wasi_subscription_t___wasi_subscription_u___wasi_subscr
);
assert_eq!(
unsafe {
&(*(::core::ptr::null::<
&(*(std::ptr::null::<
__wasi_subscription_t___wasi_subscription_u___wasi_subscription_u_clock_t,
>()))
.timeout as *const _ as usize
@@ -959,7 +958,7 @@ fn bindgen_test_layout___wasi_subscription_t___wasi_subscription_u___wasi_subscr
);
assert_eq!(
unsafe {
&(*(::core::ptr::null::<
&(*(std::ptr::null::<
__wasi_subscription_t___wasi_subscription_u___wasi_subscription_u_clock_t,
>()))
.precision as *const _ as usize
@@ -974,7 +973,7 @@ fn bindgen_test_layout___wasi_subscription_t___wasi_subscription_u___wasi_subscr
);
assert_eq!(
unsafe {
&(*(::core::ptr::null::<
&(*(std::ptr::null::<
__wasi_subscription_t___wasi_subscription_u___wasi_subscription_u_clock_t,
>()))
.flags as *const _ as usize
@@ -1022,7 +1021,7 @@ fn bindgen_test_layout___wasi_subscription_t___wasi_subscription_u___wasi_subscr
);
assert_eq!(
unsafe {
&(*(::core::ptr::null::<
&(*(std::ptr::null::<
__wasi_subscription_t___wasi_subscription_u___wasi_subscription_u_fd_readwrite_t,
>()))
.fd as *const _ as usize
@@ -1058,8 +1057,8 @@ fn bindgen_test_layout___wasi_subscription_t___wasi_subscription_u() {
);
assert_eq!(
unsafe {
&(*(::core::ptr::null::<__wasi_subscription_t___wasi_subscription_u>())).clock
as *const _ as usize
&(*(std::ptr::null::<__wasi_subscription_t___wasi_subscription_u>())).clock as *const _
as usize
},
0usize,
concat!(
@@ -1071,7 +1070,7 @@ fn bindgen_test_layout___wasi_subscription_t___wasi_subscription_u() {
);
assert_eq!(
unsafe {
&(*(::core::ptr::null::<__wasi_subscription_t___wasi_subscription_u>())).fd_readwrite
&(*(std::ptr::null::<__wasi_subscription_t___wasi_subscription_u>())).fd_readwrite
as *const _ as usize
},
0usize,
@@ -1096,7 +1095,7 @@ fn bindgen_test_layout___wasi_subscription_t() {
concat!("Alignment of ", stringify!(__wasi_subscription_t))
);
assert_eq!(
unsafe { &(*(::core::ptr::null::<__wasi_subscription_t>())).userdata as *const _ as usize },
unsafe { &(*(std::ptr::null::<__wasi_subscription_t>())).userdata as *const _ as usize },
0usize,
concat!(
"Offset of field: ",
@@ -1106,7 +1105,7 @@ fn bindgen_test_layout___wasi_subscription_t() {
)
);
assert_eq!(
unsafe { &(*(::core::ptr::null::<__wasi_subscription_t>())).type_ as *const _ as usize },
unsafe { &(*(std::ptr::null::<__wasi_subscription_t>())).type_ as *const _ as usize },
8usize,
concat!(
"Offset of field: ",
@@ -1116,7 +1115,7 @@ fn bindgen_test_layout___wasi_subscription_t() {
)
);
assert_eq!(
unsafe { &(*(::core::ptr::null::<__wasi_subscription_t>())).u as *const _ as usize },
unsafe { &(*(std::ptr::null::<__wasi_subscription_t>())).u as *const _ as usize },
16usize,
concat!(
"Offset of field: ",