instead of always being relative to CARGO_MANIFEST_DIR, each use site is
responsible for either putting that variable or another one (set by a
build.rs) at the start of witx paths.
The fundamental problem is that the target distance of jump-like operations may change in the DWARF expression translation process. Intervening DW_OP_deref will expand to about 10 bytes, for example.
So the jumps must be relocated. We approach this task by inserting artificial LandingPad markers (new CompiledExpressionParts constructors) into the parsed vector at actual Jump targets.
LandingPads are identified by JumpTargetMarker tokens which are generated on the fly.
Additionally we now parse the Jump instructions. These also get their corresponding JumpTargetMarker token.
We bail in two situations:
frame_base is too complicated (i.e. itself contains Jump)
some jump distance in the original expression is fishy.
No point in resorting to LEB128 encoding for such constants,
using the native `u32` is faster and more compact.
Adds `write_u32` method to facilitate this.
This commit extracts the two implementations of `Compiler` into two
separate crates, `wasmtime-cranelfit` and `wasmtime-lightbeam`. The
`wasmtime-jit` crate then depends on these two and instantiates them
appropriately. The goal here is to start reducing the weight of the
`wasmtime-environ` crate, which currently serves as a common set of
types between all `wasmtime-*` crates. Long-term I'd like to remove the
dependency on Cranelift from `wasmtime-environ`, but that's going to
take a lot more work.
In the meantime I figure it's a good way to get started by separating
out the lightbeam/cranelift function compilers from the
`wasmtime-environ` crate. We can continue to iterate on moving things
out in the future, too.
tracing is already the dep that wiggle uses.
I used tracing structured arguments wherever I could, but I skipped over
it in all of the snapshot_0 code, because I'm going to delete that code
and replace it with wiggle-based stuff real soon.
Although the string description for `TableOutOfBounds` isn't quite
matching what this error case is, it's a bit more descriptive than
`HeapOutOfBounds` anyway.
We've enabled bulk memory and reference types by default now which means
that wasmtime in its default settings no longer passes the spec test
suite (due to changes in error messages in initialization), so when
we're running the spec test fuzzer be sure to disable reference types
and bulk memory since that's required to pass.
This commit removes all import resolution handling from the
`wasmtime-jit` crate, instead moving the logic to the `wasmtime` crate.
Previously `wasmtime-jit` had a generic `Resolver` trait and would do
all the import type matching itself, but with the upcoming
module-linking implementation this is going to get much trickier.
The goal of this commit is to centralize all meaty "preparation" logic
for instantiation into one location, probably the `wasmtime` crate
itself. Instantiation will soon involve recursive instantiation and
management of alias definitions as well. Having everything in one
location, especially with access to `Store` so we can persist
instances for safety, will be quite convenient.
Additionally the `Resolver` trait isn't really necessary any more since
imports are, at the lowest level, provided as a list rather than a map
of some kind. More generic resolution functionality is provided via
`Linker` or user layers on top of `Instance::new` itself. This makes
matching up provided items to expected imports much easier as well.
Overall this is largely just moving code around, but most of the code
in the previous `resolve_imports` phase can be deleted since a lot of it
is handled by surrounding pieces of `wasmtime` as well.
This commit moves all of the caching support that currently lives in
`wasmtime-environ` into a `wasmtime-cache` crate and makes it optional. The
goal here is to slim down the `wasmtime-environ` crate and clearly separate
boundaries where caching is a standalone and optional feature, not intertwined
with other crates.
Provide automatic translation to opcodes from DW_OP_* identifiers. They are looked up from gimli.
Since DW_OP_WASM_location is not contained in gimli yet, we take care of manually translating it.
Currently spectest fuzzing indexes into a compile-time-created array of
strings which is the list of input files, but the order of this array is
dependent on the filesystem that we're reading from. This means that
inputs from oss-fuzz may not be easily reproducible locally because
files could be read in different orders, so indexes could be distinct.
This commit instead reads the directory paths, then sorts them, then
includes them for testing. That way fuzz inputs at a specific commit
should be consistent.
This was added long ago at this point to assist with caching, but
caching has moved to a different level such that this wonky second level
of a `Module` isn't necessary. This commit removes the `ModuleLocal`
type to simplify accessors and generally make it easier to work with.
