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wasmtime: Implement table.get and table.set

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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
This commit is contained in:
Nick Fitzgerald
2020-06-23 10:43:08 -07:00
parent 959e424c81
commit 8c5f59c0cf
20 changed files with 894 additions and 76 deletions
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22
build.rs
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@@ -205,18 +205,20 @@ fn ignore(testsuite: &str, testname: &str, strategy: &str) -> bool {
("simd", "simd_i16x8_arith2") => return true,
("simd", "simd_i8x16_arith2") => return true,
("reference_types", "table_copy_on_imported_tables")
| ("reference_types", "externref_id_function")
| ("reference_types", "table_size")
| ("reference_types", "simple_ref_is_null")
| ("reference_types", "table_grow_with_funcref") => {
// TODO(#1886): Ignore if this isn't x64, because Cranelift only
// supports reference types on x64.
return env::var("CARGO_CFG_TARGET_ARCH").unwrap() != "x86_64";
// Still working on implementing these. See #929.
("reference_types", "global")
| ("reference_types", "linking")
| ("reference_types", "ref_func")
| ("reference_types", "ref_null")
| ("reference_types", "table_fill") => {
return true;
}
// Still working on implementing these. See #929.
("reference_types", _) => return true,
// TODO(#1886): Ignore reference types tests if this isn't x64,
// because Cranelift only supports reference types on x64.
("reference_types", _) => {
return env::var("CARGO_CFG_TARGET_ARCH").unwrap() != "x86_64";
}
_ => {}
},