* wasmtime: Implement `global.{get,set}` for externref globals
We use libcalls to implement these -- unlike `table.{get,set}`, for which we
create inline JIT fast paths -- because no known toolchain actually uses
externref globals.
Part of #929
* wasmtime: Enable `{extern,func}ref` globals in the API
These instructions have fast, inline JIT paths for the common cases, and only
call out to host VM functions for the slow paths. This required some changes to
`cranelift-wasm`'s `FuncEnvironment`: instead of taking a `FuncCursor` to insert
an instruction sequence within the current basic block,
`FuncEnvironment::translate_table_{get,set}` now take a `&mut FunctionBuilder`
so that they can create whole new basic blocks. This is necessary for
implementing GC read/write barriers that involve branching (e.g. checking for
null, or whether a store buffer is at capacity).
Furthermore, it required that the `load`, `load_complex`, and `store`
instructions handle loading and storing through an `r{32,64}` rather than just
`i{32,64}` addresses. This involved making `r{32,64}` types acceptable
instantiations of the `iAddr` type variable, plus a few new instruction
encodings.
Part of #929
`funcref`s are implemented as `NonNull<VMCallerCheckedAnyfunc>`.
This should be more efficient than using a `VMExternRef` that points at a
`VMCallerCheckedAnyfunc` because it gets rid of an indirection, dynamic
allocation, and some reference counting.
Note that the null function reference is *NOT* a null pointer; it is a
`VMCallerCheckedAnyfunc` that has a null `func_ptr` member.
Part of #929
* Enable the spec::simd::simd_align test for AArch64
Copyright (c) 2020, Arm Limited.
* Disable static memory under QEMU on CI
This commit disables the usage of "static" memory on CI and instead
forces all memories to be "dynamic" meaning that they reserve much
smaller chunks of memory. This causes the QEMU process's memory to
drastically drop (10GiB -> 600MiB) and should allow us to keep enabling
tests without hitting the OOM killer on CI.
Closes#1871 (includes that)
Closes#1893
* Fix typo
Co-authored-by: Anton Kirilov <anton.kirilov@arm.com>
This is enough to get an `externref -> externref` identity function
passing.
However, `externref`s that are dropped by compiled Wasm code are (safely)
leaked. Follow up work will leverage cranelift's stack maps to resolve this
issue.
* Ensure GlobalSet on vectors are cast to Cranelift's I8X16 type
This is a fix related to the decision to use Cranelift's I8X16 type to represent Wasm's V128--it requires casting to maintain type correctness. See https://github.com/bytecodealliance/wasmtime/issues/1147.
* Enable SIMD spec test: simd_lane.wast
* Implement trap info in Lightbeam
* Start using wasm-reader instead of wasmparser for parsing operators
* Update to use wasm-reader, some reductions in allocation, support source location tracking for traps, start to support multi-value
The only thing that still needs to be supported for multi-value is stack returns, but we need to make it compatible with Cranelift.
* Error when running out of registers (although we'd hope it should be impossible) instead of panicking
* WIP: Update Lightbeam to work with latest Wasmtime
* WIP: Update Lightbeam to use current wasmtime
* WIP: Migrate to new system for builtin functions
* WIP: Update Lightbeam to work with latest Wasmtime
* Remove multi_mut
* Format
* Fix some bugs around arguments, add debuginfo offset tracking
* Complete integration with new Wasmtime
* Remove commented code
* Fix formatting
* Fix warnings, remove unused dependencies
* Fix `iter` if there are too many elements, fix compilation for latest wasmtime
* Fix float arguments on stack
* Remove wasm-reader and trap info work
* Allocate stack space _before_ passing arguments, fail if we can't zero a xmm reg
* Fix stack argument offset calculation
* Fix stack arguments in Lightbeam
* Re-add WASI because it somehow got removed during rebase
* Workaround for apparent `type_alias_impl_trait`-related bug in rustdoc
* Fix breakages caused by rebase, remove module offset info as it is unrelated to wasmtime integration PR and was broken by rebase
* Add TODO comment explaining `lightbeam::ModuleContext` trait
