create vfs module guarded by flag for emscripten vfs behavior
cleanup warning fixes
wip
emscripten vfs wip
metadata for virtual file
make an fd an i32
fix the feature flag for llvm on emscripten
more wip
wip
add logging and fix one logical error
* fix(emscripten) Remove unused imports.
This patch removes unused imports reported by `rustc` as warnings.
* fix(emscripten) Allow unreachable patterns in `_clock_gettime`.
The compiler thinks `CLOCK_MONOTONIC_COARSE` is unreachable, which is
not always the case. Add an attribute to allow unreachable patterns to
remove the warning.
* fix(emscripten) Rename unused variables.
This patch renames various unused variables by appending an underscore
to them.
* fix(emscripten) Declare `table` as immutable.
The `table` variable in `EmscriptenGlobals::new` was declared as
mutable, but it's never mutated.
* fix(emscripten) Remove an unnecessary `unsafe` block.
* fix(emscripten) Remove duplicate definition of `SO_NOSIGPIPE`.
The `SO_NOSIGPIPE` constant is defined in `syscalls/mod.rs` and
`syscalls/unix.rs`. It's never used in the first case. We can safely
remove it in this file, and keep it in `unix.rs`.
* fix(emscripten) `read_string_from_wasm` is used only on Windows.
Mark `read_string_from_wasm` as possible deadcode, since it's used
only on Windows.
* fix(emscripten) Remove `DYNAMICTOP_PTR_DIFF`, `stacktop`, `stack_max`,
`dynamic_base` and `dynamic_ptr`.
Four functions and one constant are used together but never used
inside or outside this file. They are deadcode.
* fix(emscripten) Remove `infinity` and `nan` fields of `EmscriptenGlobalsData`.
Those fields are never used.
* fix(emscripten) Allow non snake case in `emscripten_target.rs`.
Many functions in this file don't follow the snake case style for Rust
function names. The reason is that we want the names to match the
emscripten symbol names; even if a mapping is done in `lib.rs`, it's
easier to get the same names.
* fix(emscripten) Rename `STATIC_TOP` to `static_top`.
This variable is not a constant.
