cranelift

Commit Graph

Author	SHA1	Message	Date
Nick Fitzgerald	46782b18c2	`wasmtime`: Implement fast Wasm stack walking (#4431 ) * Always preserve frame pointers in Wasmtime This allows us to efficiently and simply capture Wasm stacks without maintaining and synchronizing any safety-critical side tables between the compiler and the runtime. * wasmtime: Implement fast Wasm stack walking Why do we want Wasm stack walking to be fast? Because we capture stacks whenever there is a trap and traps actually happen fairly frequently with short-lived programs and WASI's `exit`. Previously, we would rely on generating the system unwind info (e.g. `.eh_frame`) and using the system unwinder (via the `backtrace`crate) to walk the full stack and filter out any non-Wasm stack frames. This can, unfortunately, be slow for two primary reasons: 1. The system unwinder is doing `O(all-kinds-of-frames)` work rather than `O(wasm-frames)` work. 2. System unwind info and the system unwinder need to be much more general than a purpose-built stack walker for Wasm needs to be. It has to handle any kind of stack frame that any compiler might emit where as our Wasm frames are emitted by Cranelift and always have frame pointers. This translates into implementation complexity and general overhead. There can also be unnecessary-for-our-use-cases global synchronization and locks involved, further slowing down stack walking in the presence of multiple threads trying to capture stacks in parallel. This commit introduces a purpose-built stack walker for traversing just our Wasm frames. To find all the sequences of Wasm-to-Wasm stack frames, and ignore non-Wasm stack frames, we keep a linked list of `(entry stack pointer, exit frame pointer)` pairs. This linked list is maintained via Wasm-to-host and host-to-Wasm trampolines. Within a sequence of Wasm-to-Wasm calls, we can use frame pointers (which Cranelift preserves) to find the next older Wasm frame on the stack, and we keep doing this until we reach the entry stack pointer, meaning that the next older frame will be a host frame. The trampolines need to avoid a couple stumbling blocks. First, they need to be compiled ahead of time, since we may not have access to a compiler at runtime (e.g. if the `cranelift` feature is disabled) but still want to be able to call functions that have already been compiled and get stack traces for those functions. Usually this means we would compile the appropriate trampolines inside `Module::new` and the compiled module object would hold the trampolines. However, we also need to support calling host functions that are wrapped into `wasmtime::Func`s and there doesn't exist any ahead-of-time compiled module object to hold the appropriate trampolines: ```rust // Define a host function. let func_type = wasmtime::FuncType::new( vec![wasmtime::ValType::I32], vec![wasmtime::ValType::I32], ); let func = Func::new(&mut store, func_type, \|_, params, results\| { // ... Ok(()) }); // Call that host function. let mut results = vec![wasmtime::Val::I32(0)]; func.call(&[wasmtime::Val::I32(0)], &mut results)?; ``` Therefore, we define one host-to-Wasm trampoline and one Wasm-to-host trampoline in assembly that work for all Wasm and host function signatures. These trampolines are careful to only use volatile registers, avoid touching any register that is an argument in the calling convention ABI, and tail call to the target callee function. This allows forwarding any set of arguments and any returns to and from the callee, while also allowing us to maintain our linked list of Wasm stack and frame pointers before transferring control to the callee. These trampolines are not used in Wasm-to-Wasm calls, only when crossing the host-Wasm boundary, so they do not impose overhead on regular calls. (And if using one trampoline for all host-Wasm boundary crossing ever breaks branch prediction enough in the CPU to become any kind of bottleneck, we can do fun things like have multiple copies of the same trampoline and choose a random copy for each function, sharding the functions across branch predictor entries.) Finally, this commit also ends the use of a synthetic `Module` and allocating a stubbed out `VMContext` for host functions. Instead, we define a `VMHostFuncContext` with its own magic value, similar to `VMComponentContext`, specifically for host functions. <h2>Benchmarks</h2> <h3>Traps and Stack Traces</h3> Large improvements to taking stack traces on traps, ranging from shaving off 64% to 99.95% of the time it used to take. <details> ``` multi-threaded-traps/0 time: [2.5686 us 2.5808 us 2.5934 us] thrpt: [0.0000 elem/s 0.0000 elem/s 0.0000 elem/s] change: time: [-85.419% -85.153% -84.869%] (p = 0.00 < 0.05) thrpt: [+560.90% +573.56% +585.84%] Performance has improved. Found 8 outliers among 100 measurements (8.00%) 4 (4.00%) high mild 4 (4.00%) high severe multi-threaded-traps/1 time: [2.9021 us 2.9167 us 2.9322 us] thrpt: [341.04 Kelem/s 342.86 Kelem/s 344.58 Kelem/s] change: time: [-91.455% -91.294% -91.096%] (p = 0.00 < 0.05) thrpt: [+1023.1% +1048.6% +1070.3%] Performance has improved. Found 6 outliers among 100 measurements (6.00%) 1 (1.00%) high mild 5 (5.00%) high severe multi-threaded-traps/2 time: [2.9996 us 3.0145 us 3.0295 us] thrpt: [660.18 Kelem/s 663.47 Kelem/s 666.76 Kelem/s] change: time: [-94.040% -93.910% -93.762%] (p = 0.00 < 0.05) thrpt: [+1503.1% +1542.0% +1578.0%] Performance has improved. Found 5 outliers among 100 measurements (5.00%) 5 (5.00%) high severe multi-threaded-traps/4 time: [5.5768 us 5.6052 us 5.6364 us] thrpt: [709.68 Kelem/s 713.63 Kelem/s 717.25 Kelem/s] change: time: [-93.193% -93.121% -93.052%] (p = 0.00 < 0.05) thrpt: [+1339.2% +1353.6% +1369.1%] Performance has improved. multi-threaded-traps/8 time: [8.6408 us 9.1212 us 9.5438 us] thrpt: [838.24 Kelem/s 877.08 Kelem/s 925.84 Kelem/s] change: time: [-94.754% -94.473% -94.202%] (p = 0.00 < 0.05) thrpt: [+1624.7% +1709.2% +1806.1%] Performance has improved. multi-threaded-traps/16 time: [10.152 us 10.840 us 11.545 us] thrpt: [1.3858 Melem/s 1.4760 Melem/s 1.5761 Melem/s] change: time: [-97.042% -96.823% -96.577%] (p = 0.00 < 0.05) thrpt: [+2821.5% +3048.1% +3281.1%] Performance has improved. Found 1 outliers among 100 measurements (1.00%) 1 (1.00%) high mild many-modules-registered-traps/1 time: [2.6278 us 2.6361 us 2.6447 us] thrpt: [378.11 Kelem/s 379.35 Kelem/s 380.55 Kelem/s] change: time: [-85.311% -85.108% -84.909%] (p = 0.00 < 0.05) thrpt: [+562.65% +571.51% +580.76%] Performance has improved. Found 9 outliers among 100 measurements (9.00%) 3 (3.00%) high mild 6 (6.00%) high severe many-modules-registered-traps/8 time: [2.6294 us 2.6460 us 2.6623 us] thrpt: [3.0049 Melem/s 3.0235 Melem/s 3.0425 Melem/s] change: time: [-85.895% -85.485% -85.022%] (p = 0.00 < 0.05) thrpt: [+567.63% +588.95% +608.95%] Performance has improved. Found 8 outliers among 100 measurements (8.00%) 3 (3.00%) high mild 5 (5.00%) high severe many-modules-registered-traps/64 time: [2.6218 us 2.6329 us 2.6452 us] thrpt: [24.195 Melem/s 24.308 Melem/s 24.411 Melem/s] change: time: [-93.629% -93.551% -93.470%] (p = 0.00 < 0.05) thrpt: [+1431.4% +1450.6% +1469.5%] Performance has improved. Found 3 outliers among 100 measurements (3.00%) 3 (3.00%) high mild many-modules-registered-traps/512 time: [2.6569 us 2.6737 us 2.6923 us] thrpt: [190.17 Melem/s 191.50 Melem/s 192.71 Melem/s] change: time: [-99.277% -99.268% -99.260%] (p = 0.00 < 0.05) thrpt: [+13417% +13566% +13731%] Performance has improved. Found 4 outliers among 100 measurements (4.00%) 4 (4.00%) high mild many-modules-registered-traps/4096 time: [2.7258 us 2.7390 us 2.7535 us] thrpt: [1.4876 Gelem/s 1.4955 Gelem/s 1.5027 Gelem/s] change: time: [-99.956% -99.955% -99.955%] (p = 0.00 < 0.05) thrpt: [+221417% +223380% +224881%] Performance has improved. Found 2 outliers among 100 measurements (2.00%) 1 (1.00%) high mild 1 (1.00%) high severe many-stack-frames-traps/1 time: [1.4658 us 1.4719 us 1.4784 us] thrpt: [676.39 Kelem/s 679.38 Kelem/s 682.21 Kelem/s] change: time: [-90.368% -89.947% -89.586%] (p = 0.00 < 0.05) thrpt: [+860.23% +894.72% +938.21%] Performance has improved. Found 8 outliers among 100 measurements (8.00%) 5 (5.00%) high mild 3 (3.00%) high severe many-stack-frames-traps/8 time: [2.4772 us 2.4870 us 2.4973 us] thrpt: [3.2034 Melem/s 3.2167 Melem/s 3.2294 Melem/s] change: time: [-85.550% -85.370% -85.199%] (p = 0.00 < 0.05) thrpt: [+575.65% +583.51% +592.03%] Performance has improved. Found 8 outliers among 100 measurements (8.00%) 4 (4.00%) high mild 4 (4.00%) high severe many-stack-frames-traps/64 time: [10.109 us 10.171 us 10.236 us] thrpt: [6.2525 Melem/s 6.2925 Melem/s 6.3309 Melem/s] change: time: [-78.144% -77.797% -77.336%] (p = 0.00 < 0.05) thrpt: [+341.22% +350.38% +357.55%] Performance has improved. Found 7 outliers among 100 measurements (7.00%) 5 (5.00%) high mild 2 (2.00%) high severe many-stack-frames-traps/512 time: [126.16 us 126.54 us 126.96 us] thrpt: [4.0329 Melem/s 4.0461 Melem/s 4.0583 Melem/s] change: time: [-65.364% -64.933% -64.453%] (p = 0.00 < 0.05) thrpt: [+181.32% +185.17% +188.71%] Performance has improved. Found 4 outliers among 100 measurements (4.00%) 4 (4.00%) high severe ``` </details> <h3>Calls</h3> There is, however, a small regression in raw Wasm-to-host and host-to-Wasm call performance due the new trampolines. It seems to be on the order of about 2-10 nanoseconds per call, depending on the benchmark. I believe this regression is ultimately acceptable because 1. this overhead will be vastly dominated by whatever work a non-nop callee actually does, 2. we will need these trampolines, or something like them, when implementing the Wasm exceptions proposal to do things like translate Wasm's exceptions into Rust's `Result`s, 3. and because the performance improvements to trapping and capturing stack traces are of such a larger magnitude than this call regressions. <details> ``` sync/no-hook/host-to-wasm - typed - nop time: [28.683 ns 28.757 ns 28.844 ns] change: [+16.472% +17.183% +17.904%] (p = 0.00 < 0.05) Performance has regressed. Found 10 outliers among 100 measurements (10.00%) 1 (1.00%) low mild 4 (4.00%) high mild 5 (5.00%) high severe sync/no-hook/host-to-wasm - untyped - nop time: [42.515 ns 42.652 ns 42.841 ns] change: [+12.371% +14.614% +17.462%] (p = 0.00 < 0.05) Performance has regressed. Found 11 outliers among 100 measurements (11.00%) 1 (1.00%) high mild 10 (10.00%) high severe sync/no-hook/host-to-wasm - unchecked - nop time: [33.936 ns 34.052 ns 34.179 ns] change: [+25.478% +26.938% +28.369%] (p = 0.00 < 0.05) Performance has regressed. Found 9 outliers among 100 measurements (9.00%) 7 (7.00%) high mild 2 (2.00%) high severe sync/no-hook/host-to-wasm - typed - nop-params-and-results time: [34.290 ns 34.388 ns 34.502 ns] change: [+40.802% +42.706% +44.526%] (p = 0.00 < 0.05) Performance has regressed. Found 13 outliers among 100 measurements (13.00%) 5 (5.00%) high mild 8 (8.00%) high severe sync/no-hook/host-to-wasm - untyped - nop-params-and-results time: [62.546 ns 62.721 ns 62.919 ns] change: [+2.5014% +3.6319% +4.8078%] (p = 0.00 < 0.05) Performance has regressed. Found 12 outliers among 100 measurements (12.00%) 2 (2.00%) high mild 10 (10.00%) high severe sync/no-hook/host-to-wasm - unchecked - nop-params-and-results time: [42.609 ns 42.710 ns 42.831 ns] change: [+20.966% +22.282% +23.475%] (p = 0.00 < 0.05) Performance has regressed. Found 11 outliers among 100 measurements (11.00%) 4 (4.00%) high mild 7 (7.00%) high severe sync/hook-sync/host-to-wasm - typed - nop time: [29.546 ns 29.675 ns 29.818 ns] change: [+20.693% +21.794% +22.836%] (p = 0.00 < 0.05) Performance has regressed. Found 5 outliers among 100 measurements (5.00%) 3 (3.00%) high mild 2 (2.00%) high severe sync/hook-sync/host-to-wasm - untyped - nop time: [45.448 ns 45.699 ns 45.961 ns] change: [+17.204% +18.514% +19.590%] (p = 0.00 < 0.05) Performance has regressed. Found 14 outliers among 100 measurements (14.00%) 4 (4.00%) high mild 10 (10.00%) high severe sync/hook-sync/host-to-wasm - unchecked - nop time: [34.334 ns 34.437 ns 34.558 ns] change: [+23.225% +24.477% +25.886%] (p = 0.00 < 0.05) Performance has regressed. Found 12 outliers among 100 measurements (12.00%) 5 (5.00%) high mild 7 (7.00%) high severe sync/hook-sync/host-to-wasm - typed - nop-params-and-results time: [36.594 ns 36.763 ns 36.974 ns] change: [+41.967% +47.261% +52.086%] (p = 0.00 < 0.05) Performance has regressed. Found 12 outliers among 100 measurements (12.00%) 3 (3.00%) high mild 9 (9.00%) high severe sync/hook-sync/host-to-wasm - untyped - nop-params-and-results time: [63.541 ns 63.831 ns 64.194 ns] change: [-4.4337% -0.6855% +2.7134%] (p = 0.73 > 0.05) No change in performance detected. Found 8 outliers among 100 measurements (8.00%) 6 (6.00%) high mild 2 (2.00%) high severe sync/hook-sync/host-to-wasm - unchecked - nop-params-and-results time: [43.968 ns 44.169 ns 44.437 ns] change: [+18.772% +21.802% +24.623%] (p = 0.00 < 0.05) Performance has regressed. Found 15 outliers among 100 measurements (15.00%) 3 (3.00%) high mild 12 (12.00%) high severe async/no-hook/host-to-wasm - typed - nop time: [4.9612 us 4.9743 us 4.9889 us] change: [+9.9493% +11.911% +13.502%] (p = 0.00 < 0.05) Performance has regressed. Found 10 outliers among 100 measurements (10.00%) 6 (6.00%) high mild 4 (4.00%) high severe async/no-hook/host-to-wasm - untyped - nop time: [5.0030 us 5.0211 us 5.0439 us] change: [+10.841% +11.873% +12.977%] (p = 0.00 < 0.05) Performance has regressed. Found 10 outliers among 100 measurements (10.00%) 3 (3.00%) high mild 7 (7.00%) high severe async/no-hook/host-to-wasm - typed - nop-params-and-results time: [4.9273 us 4.9468 us 4.9700 us] change: [+4.7381% +6.8445% +8.8238%] (p = 0.00 < 0.05) Performance has regressed. Found 14 outliers among 100 measurements (14.00%) 5 (5.00%) high mild 9 (9.00%) high severe async/no-hook/host-to-wasm - untyped - nop-params-and-results time: [5.1151 us 5.1338 us 5.1555 us] change: [+9.5335% +11.290% +13.044%] (p = 0.00 < 0.05) Performance has regressed. Found 16 outliers among 100 measurements (16.00%) 3 (3.00%) high mild 13 (13.00%) high severe async/hook-sync/host-to-wasm - typed - nop time: [4.9330 us 4.9394 us 4.9467 us] change: [+10.046% +11.038% +12.035%] (p = 0.00 < 0.05) Performance has regressed. Found 12 outliers among 100 measurements (12.00%) 5 (5.00%) high mild 7 (7.00%) high severe async/hook-sync/host-to-wasm - untyped - nop time: [5.0073 us 5.0183 us 5.0310 us] change: [+9.3828% +10.565% +11.752%] (p = 0.00 < 0.05) Performance has regressed. Found 8 outliers among 100 measurements (8.00%) 3 (3.00%) high mild 5 (5.00%) high severe async/hook-sync/host-to-wasm - typed - nop-params-and-results time: [4.9610 us 4.9839 us 5.0097 us] change: [+9.0857% +11.513% +14.359%] (p = 0.00 < 0.05) Performance has regressed. Found 13 outliers among 100 measurements (13.00%) 7 (7.00%) high mild 6 (6.00%) high severe async/hook-sync/host-to-wasm - untyped - nop-params-and-results time: [5.0995 us 5.1272 us 5.1617 us] change: [+9.3600% +11.506% +13.809%] (p = 0.00 < 0.05) Performance has regressed. Found 10 outliers among 100 measurements (10.00%) 6 (6.00%) high mild 4 (4.00%) high severe async-pool/no-hook/host-to-wasm - typed - nop time: [2.4242 us 2.4316 us 2.4396 us] change: [+7.8756% +8.8803% +9.8346%] (p = 0.00 < 0.05) Performance has regressed. Found 8 outliers among 100 measurements (8.00%) 5 (5.00%) high mild 3 (3.00%) high severe async-pool/no-hook/host-to-wasm - untyped - nop time: [2.5102 us 2.5155 us 2.5210 us] change: [+12.130% +13.194% +14.270%] (p = 0.00 < 0.05) Performance has regressed. Found 12 outliers among 100 measurements (12.00%) 4 (4.00%) high mild 8 (8.00%) high severe async-pool/no-hook/host-to-wasm - typed - nop-params-and-results time: [2.4203 us 2.4310 us 2.4440 us] change: [+4.0380% +6.3623% +8.7534%] (p = 0.00 < 0.05) Performance has regressed. Found 14 outliers among 100 measurements (14.00%) 5 (5.00%) high mild 9 (9.00%) high severe async-pool/no-hook/host-to-wasm - untyped - nop-params-and-results time: [2.5501 us 2.5593 us 2.5700 us] change: [+8.8802% +10.976% +12.937%] (p = 0.00 < 0.05) Performance has regressed. Found 16 outliers among 100 measurements (16.00%) 5 (5.00%) high mild 11 (11.00%) high severe async-pool/hook-sync/host-to-wasm - typed - nop time: [2.4135 us 2.4190 us 2.4254 us] change: [+8.3640% +9.3774% +10.435%] (p = 0.00 < 0.05) Performance has regressed. Found 11 outliers among 100 measurements (11.00%) 6 (6.00%) high mild 5 (5.00%) high severe async-pool/hook-sync/host-to-wasm - untyped - nop time: [2.5172 us 2.5248 us 2.5357 us] change: [+11.543% +12.750% +13.982%] (p = 0.00 < 0.05) Performance has regressed. Found 8 outliers among 100 measurements (8.00%) 1 (1.00%) high mild 7 (7.00%) high severe async-pool/hook-sync/host-to-wasm - typed - nop-params-and-results time: [2.4214 us 2.4353 us 2.4532 us] change: [+1.5158% +5.0872% +8.6765%] (p = 0.00 < 0.05) Performance has regressed. Found 15 outliers among 100 measurements (15.00%) 2 (2.00%) high mild 13 (13.00%) high severe async-pool/hook-sync/host-to-wasm - untyped - nop-params-and-results time: [2.5499 us 2.5607 us 2.5748 us] change: [+10.146% +12.459% +14.919%] (p = 0.00 < 0.05) Performance has regressed. Found 18 outliers among 100 measurements (18.00%) 3 (3.00%) high mild 15 (15.00%) high severe sync/no-hook/wasm-to-host - nop - typed time: [6.6135 ns 6.6288 ns 6.6452 ns] change: [+37.927% +38.837% +39.869%] (p = 0.00 < 0.05) Performance has regressed. Found 7 outliers among 100 measurements (7.00%) 2 (2.00%) high mild 5 (5.00%) high severe sync/no-hook/wasm-to-host - nop-params-and-results - typed time: [15.930 ns 15.993 ns 16.067 ns] change: [+3.9583% +5.6286% +7.2430%] (p = 0.00 < 0.05) Performance has regressed. Found 12 outliers among 100 measurements (12.00%) 11 (11.00%) high mild 1 (1.00%) high severe sync/no-hook/wasm-to-host - nop - untyped time: [20.596 ns 20.640 ns 20.690 ns] change: [+4.3293% +5.2047% +6.0935%] (p = 0.00 < 0.05) Performance has regressed. Found 10 outliers among 100 measurements (10.00%) 5 (5.00%) high mild 5 (5.00%) high severe sync/no-hook/wasm-to-host - nop-params-and-results - untyped time: [42.659 ns 42.882 ns 43.159 ns] change: [-2.1466% -0.5079% +1.2554%] (p = 0.58 > 0.05) No change in performance detected. Found 15 outliers among 100 measurements (15.00%) 1 (1.00%) high mild 14 (14.00%) high severe sync/no-hook/wasm-to-host - nop - unchecked time: [10.671 ns 10.691 ns 10.713 ns] change: [+83.911% +87.620% +92.062%] (p = 0.00 < 0.05) Performance has regressed. Found 9 outliers among 100 measurements (9.00%) 2 (2.00%) high mild 7 (7.00%) high severe sync/no-hook/wasm-to-host - nop-params-and-results - unchecked time: [11.136 ns 11.190 ns 11.263 ns] change: [-29.719% -28.446% -27.029%] (p = 0.00 < 0.05) Performance has improved. Found 14 outliers among 100 measurements (14.00%) 4 (4.00%) high mild 10 (10.00%) high severe sync/hook-sync/wasm-to-host - nop - typed time: [6.7964 ns 6.8087 ns 6.8226 ns] change: [+21.531% +24.206% +27.331%] (p = 0.00 < 0.05) Performance has regressed. Found 14 outliers among 100 measurements (14.00%) 4 (4.00%) high mild 10 (10.00%) high severe sync/hook-sync/wasm-to-host - nop-params-and-results - typed time: [15.865 ns 15.921 ns 15.985 ns] change: [+4.8466% +6.3330% +7.8317%] (p = 0.00 < 0.05) Performance has regressed. Found 16 outliers among 100 measurements (16.00%) 3 (3.00%) high mild 13 (13.00%) high severe sync/hook-sync/wasm-to-host - nop - untyped time: [21.505 ns 21.587 ns 21.677 ns] change: [+8.0908% +9.1943% +10.254%] (p = 0.00 < 0.05) Performance has regressed. Found 8 outliers among 100 measurements (8.00%) 4 (4.00%) high mild 4 (4.00%) high severe sync/hook-sync/wasm-to-host - nop-params-and-results - untyped time: [44.018 ns 44.128 ns 44.261 ns] change: [-1.4671% -0.0458% +1.2443%] (p = 0.94 > 0.05) No change in performance detected. Found 14 outliers among 100 measurements (14.00%) 5 (5.00%) high mild 9 (9.00%) high severe sync/hook-sync/wasm-to-host - nop - unchecked time: [11.264 ns 11.326 ns 11.387 ns] change: [+80.225% +81.659% +83.068%] (p = 0.00 < 0.05) Performance has regressed. Found 6 outliers among 100 measurements (6.00%) 3 (3.00%) high mild 3 (3.00%) high severe sync/hook-sync/wasm-to-host - nop-params-and-results - unchecked time: [11.816 ns 11.865 ns 11.920 ns] change: [-29.152% -28.040% -26.957%] (p = 0.00 < 0.05) Performance has improved. Found 14 outliers among 100 measurements (14.00%) 8 (8.00%) high mild 6 (6.00%) high severe async/no-hook/wasm-to-host - nop - typed time: [6.6221 ns 6.6385 ns 6.6569 ns] change: [+43.618% +44.755% +45.965%] (p = 0.00 < 0.05) Performance has regressed. Found 13 outliers among 100 measurements (13.00%) 6 (6.00%) high mild 7 (7.00%) high severe async/no-hook/wasm-to-host - nop-params-and-results - typed time: [15.884 ns 15.929 ns 15.983 ns] change: [+3.5987% +5.2053% +6.7846%] (p = 0.00 < 0.05) Performance has regressed. Found 16 outliers among 100 measurements (16.00%) 3 (3.00%) high mild 13 (13.00%) high severe async/no-hook/wasm-to-host - nop - untyped time: [20.615 ns 20.702 ns 20.821 ns] change: [+6.9799% +8.1212% +9.2819%] (p = 0.00 < 0.05) Performance has regressed. Found 10 outliers among 100 measurements (10.00%) 2 (2.00%) high mild 8 (8.00%) high severe async/no-hook/wasm-to-host - nop-params-and-results - untyped time: [41.956 ns 42.207 ns 42.521 ns] change: [-4.3057% -2.7730% -1.2428%] (p = 0.00 < 0.05) Performance has improved. Found 14 outliers among 100 measurements (14.00%) 3 (3.00%) high mild 11 (11.00%) high severe async/no-hook/wasm-to-host - nop - unchecked time: [10.440 ns 10.474 ns 10.513 ns] change: [+83.959% +85.826% +87.541%] (p = 0.00 < 0.05) Performance has regressed. Found 11 outliers among 100 measurements (11.00%) 5 (5.00%) high mild 6 (6.00%) high severe async/no-hook/wasm-to-host - nop-params-and-results - unchecked time: [11.476 ns 11.512 ns 11.554 ns] change: [-29.857% -28.383% -26.978%] (p = 0.00 < 0.05) Performance has improved. Found 12 outliers among 100 measurements (12.00%) 1 (1.00%) low mild 6 (6.00%) high mild 5 (5.00%) high severe async/no-hook/wasm-to-host - nop - async-typed time: [26.427 ns 26.478 ns 26.532 ns] change: [+6.5730% +7.4676% +8.3983%] (p = 0.00 < 0.05) Performance has regressed. Found 9 outliers among 100 measurements (9.00%) 2 (2.00%) high mild 7 (7.00%) high severe async/no-hook/wasm-to-host - nop-params-and-results - async-typed time: [28.557 ns 28.693 ns 28.880 ns] change: [+1.9099% +3.7332% +5.9731%] (p = 0.00 < 0.05) Performance has regressed. Found 15 outliers among 100 measurements (15.00%) 1 (1.00%) high mild 14 (14.00%) high severe async/hook-sync/wasm-to-host - nop - typed time: [6.7488 ns 6.7630 ns 6.7784 ns] change: [+19.935% +22.080% +23.683%] (p = 0.00 < 0.05) Performance has regressed. Found 9 outliers among 100 measurements (9.00%) 4 (4.00%) high mild 5 (5.00%) high severe async/hook-sync/wasm-to-host - nop-params-and-results - typed time: [15.928 ns 16.031 ns 16.149 ns] change: [+5.5188% +6.9567% +8.3839%] (p = 0.00 < 0.05) Performance has regressed. Found 11 outliers among 100 measurements (11.00%) 9 (9.00%) high mild 2 (2.00%) high severe async/hook-sync/wasm-to-host - nop - untyped time: [21.930 ns 22.114 ns 22.296 ns] change: [+4.6674% +7.7588% +10.375%] (p = 0.00 < 0.05) Performance has regressed. Found 4 outliers among 100 measurements (4.00%) 3 (3.00%) high mild 1 (1.00%) high severe async/hook-sync/wasm-to-host - nop-params-and-results - untyped time: [42.684 ns 42.858 ns 43.081 ns] change: [-5.2957% -3.4693% -1.6217%] (p = 0.00 < 0.05) Performance has improved. Found 14 outliers among 100 measurements (14.00%) 2 (2.00%) high mild 12 (12.00%) high severe async/hook-sync/wasm-to-host - nop - unchecked time: [11.026 ns 11.053 ns 11.086 ns] change: [+70.751% +72.378% +73.961%] (p = 0.00 < 0.05) Performance has regressed. Found 10 outliers among 100 measurements (10.00%) 5 (5.00%) high mild 5 (5.00%) high severe async/hook-sync/wasm-to-host - nop-params-and-results - unchecked time: [11.840 ns 11.900 ns 11.982 ns] change: [-27.977% -26.584% -24.887%] (p = 0.00 < 0.05) Performance has improved. Found 18 outliers among 100 measurements (18.00%) 3 (3.00%) high mild 15 (15.00%) high severe async/hook-sync/wasm-to-host - nop - async-typed time: [27.601 ns 27.709 ns 27.882 ns] change: [+8.1781% +9.1102% +10.030%] (p = 0.00 < 0.05) Performance has regressed. Found 11 outliers among 100 measurements (11.00%) 2 (2.00%) low mild 3 (3.00%) high mild 6 (6.00%) high severe async/hook-sync/wasm-to-host - nop-params-and-results - async-typed time: [28.955 ns 29.174 ns 29.413 ns] change: [+1.1226% +3.0366% +5.1126%] (p = 0.00 < 0.05) Performance has regressed. Found 13 outliers among 100 measurements (13.00%) 7 (7.00%) high mild 6 (6.00%) high severe async-pool/no-hook/wasm-to-host - nop - typed time: [6.5626 ns 6.5733 ns 6.5851 ns] change: [+40.561% +42.307% +44.514%] (p = 0.00 < 0.05) Performance has regressed. Found 9 outliers among 100 measurements (9.00%) 5 (5.00%) high mild 4 (4.00%) high severe async-pool/no-hook/wasm-to-host - nop-params-and-results - typed time: [15.820 ns 15.886 ns 15.969 ns] change: [+4.1044% +5.7928% +7.7122%] (p = 0.00 < 0.05) Performance has regressed. Found 17 outliers among 100 measurements (17.00%) 4 (4.00%) high mild 13 (13.00%) high severe async-pool/no-hook/wasm-to-host - nop - untyped time: [20.481 ns 20.521 ns 20.566 ns] change: [+6.7962% +7.6950% +8.7612%] (p = 0.00 < 0.05) Performance has regressed. Found 11 outliers among 100 measurements (11.00%) 6 (6.00%) high mild 5 (5.00%) high severe async-pool/no-hook/wasm-to-host - nop-params-and-results - untyped time: [41.834 ns 41.998 ns 42.189 ns] change: [-3.8185% -2.2687% -0.7541%] (p = 0.01 < 0.05) Change within noise threshold. Found 13 outliers among 100 measurements (13.00%) 3 (3.00%) high mild 10 (10.00%) high severe async-pool/no-hook/wasm-to-host - nop - unchecked time: [10.353 ns 10.380 ns 10.414 ns] change: [+82.042% +84.591% +87.205%] (p = 0.00 < 0.05) Performance has regressed. Found 7 outliers among 100 measurements (7.00%) 4 (4.00%) high mild 3 (3.00%) high severe async-pool/no-hook/wasm-to-host - nop-params-and-results - unchecked time: [11.123 ns 11.168 ns 11.228 ns] change: [-30.813% -29.285% -27.874%] (p = 0.00 < 0.05) Performance has improved. Found 12 outliers among 100 measurements (12.00%) 11 (11.00%) high mild 1 (1.00%) high severe async-pool/no-hook/wasm-to-host - nop - async-typed time: [27.442 ns 27.528 ns 27.638 ns] change: [+7.5215% +9.9795% +12.266%] (p = 0.00 < 0.05) Performance has regressed. Found 18 outliers among 100 measurements (18.00%) 3 (3.00%) high mild 15 (15.00%) high severe async-pool/no-hook/wasm-to-host - nop-params-and-results - async-typed time: [29.014 ns 29.148 ns 29.312 ns] change: [+2.0227% +3.4722% +4.9047%] (p = 0.00 < 0.05) Performance has regressed. Found 7 outliers among 100 measurements (7.00%) 6 (6.00%) high mild 1 (1.00%) high severe async-pool/hook-sync/wasm-to-host - nop - typed time: [6.7916 ns 6.8116 ns 6.8325 ns] change: [+20.937% +22.050% +23.281%] (p = 0.00 < 0.05) Performance has regressed. Found 11 outliers among 100 measurements (11.00%) 5 (5.00%) high mild 6 (6.00%) high severe async-pool/hook-sync/wasm-to-host - nop-params-and-results - typed time: [15.917 ns 15.975 ns 16.051 ns] change: [+4.6404% +6.4217% +8.3075%] (p = 0.00 < 0.05) Performance has regressed. Found 16 outliers among 100 measurements (16.00%) 5 (5.00%) high mild 11 (11.00%) high severe async-pool/hook-sync/wasm-to-host - nop - untyped time: [21.558 ns 21.612 ns 21.679 ns] change: [+8.1158% +9.1409% +10.217%] (p = 0.00 < 0.05) Performance has regressed. Found 9 outliers among 100 measurements (9.00%) 2 (2.00%) high mild 7 (7.00%) high severe async-pool/hook-sync/wasm-to-host - nop-params-and-results - untyped time: [42.475 ns 42.614 ns 42.775 ns] change: [-6.3613% -4.4709% -2.7647%] (p = 0.00 < 0.05) Performance has improved. Found 18 outliers among 100 measurements (18.00%) 3 (3.00%) high mild 15 (15.00%) high severe async-pool/hook-sync/wasm-to-host - nop - unchecked time: [11.150 ns 11.195 ns 11.247 ns] change: [+74.424% +77.056% +79.811%] (p = 0.00 < 0.05) Performance has regressed. Found 14 outliers among 100 measurements (14.00%) 3 (3.00%) high mild 11 (11.00%) high severe async-pool/hook-sync/wasm-to-host - nop-params-and-results - unchecked time: [11.639 ns 11.695 ns 11.760 ns] change: [-30.212% -29.023% -27.954%] (p = 0.00 < 0.05) Performance has improved. Found 15 outliers among 100 measurements (15.00%) 7 (7.00%) high mild 8 (8.00%) high severe async-pool/hook-sync/wasm-to-host - nop - async-typed time: [27.480 ns 27.712 ns 27.984 ns] change: [+2.9764% +6.5061% +9.8914%] (p = 0.00 < 0.05) Performance has regressed. Found 8 outliers among 100 measurements (8.00%) 6 (6.00%) high mild 2 (2.00%) high severe async-pool/hook-sync/wasm-to-host - nop-params-and-results - async-typed time: [29.218 ns 29.380 ns 29.600 ns] change: [+5.2283% +7.7247% +10.822%] (p = 0.00 < 0.05) Performance has regressed. Found 16 outliers among 100 measurements (16.00%) 2 (2.00%) high mild 14 (14.00%) high severe ``` </details> * Add s390x support for frame pointer-based stack walking * wasmtime: Allow `Caller::get_export` to get all exports * fuzzing: Add a fuzz target to check that our stack traces are correct We generate Wasm modules that keep track of their own stack as they call and return between functions, and then we periodically check that if the host captures a backtrace, it matches what the Wasm module has recorded. * Remove VM offsets for `VMHostFuncContext` since it isn't used by JIT code * Add doc comment with stack walking implementation notes * Document the extra state that can be passed to `wasmtime_runtime::Backtrace` methods * Add extensive comments for stack walking function * Factor architecture-specific bits of stack walking out into modules * Initialize store-related fields in a vmctx to null when there is no store yet Rather than leaving them as uninitialized data. * Use `set_callee` instead of manually setting the vmctx field * Use a more informative compile error message for unsupported architectures * Document unsafety of `prepare_host_to_wasm_trampoline` * Use `bti c` instead of `hint #34` in inline aarch64 assembly * Remove outdated TODO comment * Remove setting of `last_wasm_exit_fp` in `set_jit_trap` This is no longer needed as the value is plumbed through to the backtrace code directly now. * Only set the stack limit once, in the face of re-entrancy into Wasm * Add comments for s390x-specific stack walking bits * Use the helper macro for all libcalls If we forget to use it, and then trigger a GC from the libcall, that means we could miss stack frames when walking the stack, fail to find live GC refs, and then get use after free bugs. Much less risky to always use the helper macro that takes care of all of that for us. * Use the `asm_sym!` macro in Wasm-to-libcall trampolines This macro handles the macOS-specific underscore prefix stuff for us. * wasmtime: add size and align to `externref` assertion error message * Extend the `stacks` fuzzer to have host frames in between Wasm frames This way we get one or more contiguous sequences of Wasm frames on the stack, instead of exactly one. * Add documentation for aarch64-specific backtrace helpers * Clarify that we only support little-endian aarch64 in trampoline comment * Use `.machine z13` in s390x assembly file Since apparently our CI machines have pretty old assemblers that don't have `.machine z14`. This should be fine though since these trampolines don't make use of anything that is introduced in z14. * Fix aarch64 build * Fix macOS build * Document the `asm_sym!` macro * Add windows support to the `wasmtime-asm-macros` crate * Add windows support to host<--->Wasm trampolines * Fix trap handler build on windows * Run `rustfmt` on s390x trampoline source file * Temporarily disable some assertions about a trap's backtrace in the component model tests Follow up to re-enable this and fix the associated issue: https://github.com/bytecodealliance/wasmtime/issues/4535 * Refactor libcall definitions with less macros This refactors the `libcall!` macro to use the `foreach_builtin_function!` macro to define all of the trampolines. Additionally the macro surrounding each libcall itself is no longer necessary and helps avoid too many macros. * Use `VMOpaqueContext::from_vm_host_func_context` in `VMHostFuncContext::new` * Move `backtrace` module to be submodule of `traphandlers` This avoids making some things `pub(crate)` in `traphandlers` that really shouldn't be. * Fix macOS aarch64 build * Use "i64" instead of "word" in aarch64-specific file * Save/restore entry SP and exit FP/return pointer in the face of panicking imported host functions Also clean up assertions surrounding our saved entry/exit registers. * Put "typed" vs "untyped" in the same position of call benchmark names Regardless if we are doing wasm-to-host or host-to-wasm * Fix stacks test case generator build for new `wasm-encoder` * Fix build for s390x * Expand libcalls in s390x asm * Disable more parts of component tests now that backtrace assertions are a bit tighter * Remove assertion that can maybe fail on s390x Co-authored-by: Ulrich Weigand <ulrich.weigand@de.ibm.com> Co-authored-by: Alex Crichton <alex@alexcrichton.com>	2 years ago
Alex Crichton	32979b2714	Implement flags in fused adapters (#4549 ) This implements the `flags` type for fused adapters and converting between modules. The main logic here is handling the variable size of flags in addition to the masking which happens to ignore unrelated bits when the values pass through the canonical ABI.	2 years ago
Alex Crichton	ce7bbef24d	Implement other variant-like types in adapter fusion (#4547 ) This commit fills out the adapter fusion compiler for the `union`, `enum`, `option,` and `result` types. The preexisting support for `variant` types was refactored slightly to be extensible to all of these other types and they all now call into the same common translation code.	2 years ago
Alex Crichton	e1148e43be	Implement `char` type in adapter fusion (#4544 ) This commit implements the translation of `char` which validates that it's in the valid range of unicode scalar values. The precise validation here is lifted from LLVM in the hopes that it's probably better than whatever I would concoct by hand.	2 years ago
Alex Crichton	174b60dcf7	Add `.wast` support for invoking components (#4526 ) This commit builds on bytecodealliance/wasm-tools#690 to add support to testing of the component model to execute functions when running `.wast` files. This support is all built on #4442 as functions are invoked through a "dynamic" API. Right now the testing and integration is fairly crude but I'm hoping that we can try to improve it over time as necessary. For now this should provide a hopefully more convenient syntax for unit tests and the like.	2 years ago
Alex Crichton	285bc5ce24	Implement variant translation in fused adapters (#4534 ) * Implement variant translation in fused adapters This commit implements the most general case of variants for fused adapter trampolines. Additionally a number of other primitive types are filled out here to assist with testing variants. The implementation internally was relatively straightforward given the shape of variants, but there's room for future optimization as necessary especially around converting locals to various types. This commit also introduces a "one off" fuzzer for adapters to ensure that the generated adapter is valid. I hope to extend this fuzz generator as more types are implemented to assist in various corner cases that might arise. For now the fuzzer simply tests that the output wasm module is valid, not that it actually executes correctly. I hope to integrate with a fuzzer along the lines of #4307 one day to test the run-time-correctness of the generated adapters as well, at which point this fuzzer would become obsolete. Finally this commit also fixes an issue with `u8` translation where upper bits weren't zero'd out and were passed raw across modules. Instead smaller-than-32 types now all mask out their upper bits and do sign-extension as appropriate for unsigned/signed variants. * Fuzz memory64 in the new trampoline fuzzer Currently memory64 isn't supported elsewhere in the component model implementation of Wasmtime but the trampoline compiler seems as good a place as any to ensure that it at least works in isolation. This plumbs through fuzz input into a `memory64` boolean which gets fed into compilation. Some miscellaneous bugs were fixed as a result to ensure that memory64 trampolines all validate correctly. * Tweak manifest for doc build	2 years ago
Alex Crichton	1321c234e5	Remove dependency on `more-asserts` (#4408 ) * Remove dependency on `more-asserts` In my recent adventures to do a bit of gardening on our dependencies I noticed that there's a new major version for the `more-asserts` crate. Instead of updating to this though I've opted to instead remove the dependency since I don't think we heavily lean on this crate and otherwise one-off prints are probably sufficient to avoid the need for pulling in a whole crate for this. * Remove exemption for `more-asserts`	2 years ago
Alex Crichton	97894bc65e	Add initial support for fused adapter trampolines (#4501 ) * Add initial support for fused adapter trampolines This commit lands a significant new piece of functionality to Wasmtime's implementation of the component model in the form of the implementation of fused adapter trampolines. Internally within a component core wasm modules can communicate with each other by having their exports `canon lift`'d to get `canon lower`'d into a different component. This signifies that two components are communicating through a statically known interface via the canonical ABI at this time. Previously Wasmtime was able to identify that this communication was happening but it simply panicked with `unimplemented!` upon seeing it. This commit is the beginning of filling out this panic location with an actual implementation. The implementation route chosen here for fused adapters is to use a WebAssembly module itself for the implementation. This means that, at compile time of a component, Wasmtime is generating core WebAssembly modules which then get recursively compiled within Wasmtime as well. The choice to use WebAssembly itself as the implementation of fused adapters stems from a few motivations: * This does not represent a significant increase in the "trusted compiler base" of Wasmtime. Getting the Wasm -> CLIF translation correct once is hard enough much less for an entirely different IR to CLIF. By generating WebAssembly no new interactions with Cranelift are added which drastically reduces the possibilities for mistakes. * Using WebAssembly means that component adapters are insulated from miscompilations and mistakes. If something goes wrong it's defined well within the WebAssembly specification how it goes wrong and what happens as a result. This means that the "blast zone" for a wrong adapter is the component instance but not the entire host itself. Accesses to linear memory are guaranteed to be in-bounds and otherwise handled via well-defined traps. * A fully-finished fused adapter compiler is expected to be a significant and quite complex component of Wasmtime. Functionality along these lines is expected to be needed for Web-based polyfills of the component model and by using core WebAssembly it provides the opportunity to share code between Wasmtime and these polyfills for the component model. * Finally the runtime implementation of managing WebAssembly modules is already implemented and quite easy to integrate with, so representing fused adapters with WebAssembly results in very little extra support necessary for the runtime implementation of instantiating and managing a component. The compiler added in this commit is dubbed Wasmtime's Fused Adapter Compiler of Trampolines (FACT) because who doesn't like deriving a name from an acronym. Currently the trampoline compiler is limited in its support for interface types and only supports a few primitives. I plan on filing future PRs to flesh out the support here for all the variants of `InterfaceType`. For now this PR is primarily focused on all of the other infrastructure for the addition of a trampoline compiler. With the choice to use core WebAssembly to implement fused adapters it means that adapters need to be inserted into a module. Unfortunately adapters cannot all go into a single WebAssembly module because adapters themselves have dependencies which may be provided transitively through instances that were instantiated with other adapters. This means that a significant chunk of this PR (`adapt.rs`) is dedicated to determining precisely which adapters go into precisely which adapter modules. This partitioning process attempts to make large modules wherever it can to cut down on core wasm instantiations but is likely not optimal as it's just a simple heuristic today. With all of this added together it's now possible to start writing `.wast` tests that internally have adapted modules communicating with one another. A `fused.wast` test suite was added as part of this PR which is the beginning of tests for the support of the fused adapter compiler added in this PR. Currently this is primarily testing some various topologies of adapters along with direct/indirect modes. This will grow many more tests over time as more types are supported. Overall I'm not 100% satisfied with the testing story of this PR. When a test fails it's very difficult to debug since everything is written in the text format of WebAssembly meaning there's no "conveniences" to print out the state of the world when things go wrong and easily debug. I think this will become even more apparent as more tests are written for more types in subsequent PRs. At this time though I know of no better alternative other than leaning pretty heavily on fuzz-testing to ensure this is all exercised. Fix an unused field warning * Fix tests in `wasmtime-runtime` * Add some more tests for compiled trampolines * Remap exports when injecting adapters The exports of a component were accidentally left unmapped which meant that they indexed the instance indexes pre-adapter module insertion. * Fix typo * Rebase conflicts	2 years ago
Peter Huene	80bd650bab	Components: ignore type exports (for now). (#4488 ) * Components: ignore type exports (for now). This commit updates component translation to ignore type exports for now. Components generated with `wit-component` contain type exports to give names to types used within the component's functions based on the component's wit definition. The intention is to allow bindings to be generated with meaningful names directly from a component. In the future, type exports (and imports) may be used for more than this purpose to support things like resource types. This commit effectively ignores type exports when translating the component as they are not useful to executing a component at this time. Closes #4415. * Code review feedback.	2 years ago
Alex Crichton	3032e3fcfb	Track type information during component translation (#4448 ) This commit augments the current translation phase of components with extra machinery to track the type information of component items such as instances, components, and functions. The end goal of this commit is to enable the `Lower` instruction to know the type of the component function being lowered. Currently during the inlining pass where component fusion is detected the type of the lifted function is known, but to implement fusion entirely the type of the lowered function must be known. Note that these two types are expected to be different to allow for the subtyping rules specified by the component model. For now nothing is actually done with this information other than noting its presence in the face of a lifted-then-lowered function. My hope though was to split this out for a separate review to avoid making a future component-adapter-compiler-containing-PR too large.	2 years ago
Alex Crichton	9ae060a12a	Update some dependency versions used by Wasmtime (#4405 ) No major motivation here, mostly just dependency gardening.	2 years ago
Alex Crichton	038383dc42	Implement support for outer core type aliases (#4385 ) Fill in the gaps of the implementation left after #4380.	2 years ago
Nick Fitzgerald	7000b0a4cf	wasmtime: Add criterion micro benchmarks for traps (#4398 ) * wasmtime: Rename host->wasm trampolines As we introduce new types of trampolines, having clear names for our existing trampolines will be helpful. * Fix typo in docs for `VMCOMPONENT_MAGIC` * wasmtime: Add criterion micro benchmarks for traps	2 years ago
Alex Crichton	41ba851a95	Bump versions of wasm-tools crates (#4380 ) * Bump versions of wasm-tools crates Note that this leaves new features in the component model, outer type aliases for core wasm types, unimplemented for now. * Move to crates.io-based versions of tools	2 years ago
Alex Crichton	76a2545a7f	Implement nested instance exports for components (#4364 ) This commit adds support to Wasmtime for components which themselves export instances. The support here adds new APIs for how instance exports are accessed in the embedding API. For now this is mostly just a first-pass where the API is somewhat confusing and has a lot of lifetimes. I'm hoping that over time we can figure out how to simplify this but for now it should at least be expressive enough for exploring the exports of an instance.	2 years ago
wasmtime-publish	7c428bbd62	Bump Wasmtime to 0.40.0 (#4378 ) Co-authored-by: Wasmtime Publish <wasmtime-publish@users.noreply.github.com>	2 years ago
Alex Crichton	f0278c5db7	Implement `canon lower` of a `canon lift` function in the same component (#4347 ) * Implement `canon lower` of a `canon lift` function in the same component This commit implements the "degenerate" logic for implementing a function within a component that is lifted and then immediately lowered again. In this situation the lowered function will immediately generate a trap and doesn't need to implement anything else. The implementation in this commit is somewhat heavyweight but I think is probably justified moreso in future additions to the component model rather than what exactly is here right now. It's not expected that this "always trap" functionality will really be used all that often since it would generally mean a buggy component, but the functionality plumbed through here is hopefully going to be useful for implementing component-to-component adapter trampolines. Specifically this commit implements a strategy where the `canon.lower`'d function is generated by Cranelift and simply has a single trap instruction when called, doing nothing else. The main complexity comes from juggling around all the data associated with these functions, primarily plumbing through the traps into the `ModuleRegistry` to ensure that the global `is_wasm_trap_pc` function returns `true` and at runtime when we lookup information about the trap it's all readily available (e.g. translating the trapping pc to a `TrapCode`). * Fix non-component build * Fix some offset calculations * Only create one "always trap" per signature Use an internal map to deduplicate during compilation.	2 years ago
Alex Crichton	eef1758d19	Implement a first-class error for reexported component functions (#4348 ) Currently I don't know how we can reasonably implement this. Given all the signatures of how we call functions and how functions are called on the host there's no real feasible way that I know of to hook these two up "seamlessly". This means that a component which reexports an imported function can't be run in Wasmtime. One of the main reasons for this is that when calling a component function Wasmtime wants to lower arguments first and then have them lifted when the host is called. With a reexport though there's not actually anything to lower into so we'd sort of need something similar to a table on the side or maybe a linear memory and that seems like it'd get quite complicated quite quickly for not really all that much benefit. As-such for now this simply returns a first-class error (rather than the current panic) in situations like this.	2 years ago
Alex Crichton	c1b3962f7b	Implement lowered-then-lifted functions (#4327 ) * Implement lowered-then-lifted functions This commit is a few features bundled into one, culminating in the implementation of lowered-then-lifted functions for the component model. It's probably not going to be used all that often but this is possible within a valid component so Wasmtime needs to do something relatively reasonable. The main things implemented in this commit are: * Component instances are now assigned a `RuntimeComponentInstanceIndex` to differentiate each one. This will be used in the future to detect fusion (one instance lowering a function from another instance). For now it's used to allocate separate `VMComponentFlags` for each internal component instance. * The `CoreExport<FuncIndex>` of lowered functions was changed to a `CoreDef` since technically a lowered function can use another lowered function as the callee. This ended up being not too difficult to plumb through as everything else was already in place. * A need arose to compile host-to-wasm trampolines which weren't already present. Currently wasm in a component is always entered through a host-to-wasm trampoline but core wasm modules are the source of all the trampolines. In the case of a lowered-then-lifted function there may not actually be any core wasm modules, so component objects now contain necessary trampolines not otherwise provided by the core wasm objects. This feature required splitting a new function into the `Compiler` trait for creating a host-to-wasm trampoline. After doing this core wasm compilation was also updated to leverage this which further enabled compiling trampolines in parallel as opposed to the previous synchronous compilation. * Review comments	2 years ago
Alex Crichton	3339dd1f01	Implement the post-return attribute (#4297 ) This commit implements the `post-return` feature of the canonical ABI in the component model. This attribute is an optionally-specified function which is to be executed after the return value has been processed by the caller to optionally clean-up the return value. This enables, for example, returning an allocated string and the host then knows how to clean it up to prevent memory leaks in the original module. The API exposed in this PR changes the prior `TypedFunc::call` API in behavior but not in its signature. Previously the `TypedFunc::call` method would set the `may_enter` flag on the way out, but now that operation is deferred until a new `TypedFunc::post_return` method is called. This means that once a method on an instance is invoked then nothing else can be done on the instance until the `post_return` method is called. Note that the method must be called irrespective of whether the `post-return` canonical ABI option was specified or not. Internally wasm will be invoked if necessary. This is a pretty wonky and unergonomic API to work with. For now I couldn't think of a better alternative that improved on the ergonomics. In the theory that the raw Wasmtime bindings for a component may not be used all that heavily (instead `wit-bindgen` would largely be used) I'm hoping that this isn't too much of an issue in the future. cc #4185	2 years ago
Alex Crichton	651f40855f	Add support for nested components (#4285 ) * Add support for nested components This commit is an implementation of a number of features of the component model including: * Defining nested components * Outer aliases to components and modules * Instantiating nested components The implementation here is intended to be a foundational pillar of Wasmtime's component model support since recursion and nested components are the bread-and-butter of the component model. At a high level the intention for the component model implementation in Wasmtime has long been that the recursive nature of components is "erased" at compile time to something that's more optimized and efficient to process. This commit ended up exemplifying this quite well where the vast majority of the internal changes here are in the "compilation" phase of a component rather than the runtime instantiation phase. The support in the `wasmtime` crate, the runtime instantiation support, only had minor updates here while the internals of translation have seen heavy updates. The `translate` module was greatly refactored here in this commit. Previously it would, as a component is parsed, create a final `Component` to hand off to trampoline compilation and get persisted at runtime. Instead now it's a thin layer over `wasmparser` which simply records a list of `LocalInitializer` entries for how to instantiate the component and its index spaces are built. This internal representation of the instantiation of a component is pretty close to the binary format intentionally. Instead of performing dataflow legwork the `translate` phase of a component is now responsible for two primary tasks: 1. All components and modules are discovered within a component. They're assigned `Static{Component,Module}Index` depending on where they're found and a `{Module,}Translation` is prepared for each one. This "flattens" the recursive structure of the binary into an indexed list processable later. 2. The lexical scope of components is managed here to implement outer module and component aliases. This is a significant design implementation because when closing over an outer component or module that item may actually be imported or something like the result of a previous instantiation. This means that the capture of modules and components is both a lexical concern as well as a runtime concern. The handling of the "runtime" bits are handled in the next phase of compilation. The next and currently final phase of compilation is a new pass where much of the historical code in `translate.rs` has been moved to (but heavily refactored). The goal of compilation is to produce one "flat" list of initializers for a component (as happens prior to this PR) and to achieve this an "inliner" phase runs which runs through the instantiation process at compile time to produce a list of initializers. This `inline` module is the main addition as part of this PR and is now the workhorse for dataflow analysis and tracking what's actually referring to what. During the `inline` phase the local initializers recorded in the `translate` phase are processed, in sequence, to instantiate a component. Definitions of items are tracked to correspond to their root definition which allows seeing across instantiation argument boundaries and such. Handling "upvars" for component outer aliases is handled in the `inline` phase as well by creating state for a component whenever a component is defined as was recorded during the `translate` phase. Finally this phase is chiefly responsible for doing all string-based name resolution at compile time that it can. This means that at runtime no string maps will need to be consulted for item exports and such. The final result of inlining is a list of "global initializers" which is a flat list processed during instantiation time. These are almost identical to the initializers that were processed prior to this PR. There are certainly still more gaps of the component model to implement but this should be a major leg up in terms of functionality that Wasmtime implements. This commit, however leaves behind a "hole" which is not intended to be filled in at this time, namely importing and exporting components at the "root" level from and to the host. This is tracked and explained in more detail as part of #4283. cc #4185 as this completes a number of items there * Tweak code to work on stable without warning * Review comments	2 years ago
Pure White	258dc9de42	fix(wasmtime):`Config` methods should be idempotent (#4252 ) This commit refactored `Config` to use a seperate `CompilerConfig` field instead of operating on `CompilerBuilder` directly to make all its methods idempotent. Fixes #4189	2 years ago
Andrew Brown	0dcda643ea	runtime: vmoffsets must be checked in reverse order (#4253 ) When adding shared memory, memories owned by the module were added to a `owned_memories` array placed immediately after the `defined_memories` array. When checking the size of each array with `region_sizes`, the size of `defined_memories` and `owned_memories` were checked in this order. But `region_sizes` is iterating through the fields in the reverse order. This change reverses the field order to fix the associated fuzz bug.	2 years ago
Alex Crichton	7d7ddceb17	Update wasm-tools crates (#4246 ) This commit updates the wasm-tools family of crates, notably pulling in the refactorings and updates from bytecodealliance/wasm-tools#621 for the latest iteration of the component model. This commit additionally updates all support for the component model for these changes, notably: * Many bits and pieces of type information was refactored. Many `FooTypeIndex` namings are now `TypeFooIndex`. Additionally there is now `TypeIndex` as well as `ComponentTypeIndex` for the two type index spaces in a component. * A number of new sections are now processed to handle the core and component variants. * Internal maps were split such as the `funcs` map into `component_funcs` and `funcs` (same for `instances`). * Canonical options are now processed individually instead of one bulk `into` definition. Overall this was not a major update to the internals of handling the component model in Wasmtime. Instead this was mostly a surface-level refactoring to make sure that everything lines up with the new binary format for components. * All text syntax used in tests was updated to the new syntax.	2 years ago
Andrew Brown	2b52f47b83	Add shared memories (#4187 ) * Add shared memories This change adds the ability to use shared memories in Wasmtime when the [threads proposal] is enabled. Shared memories are annotated as `shared` in the WebAssembly syntax, e.g., `(memory 1 1 shared)`, and are protected from concurrent access during `memory.size` and `memory.grow`. [threads proposal]: https://github.com/WebAssembly/threads/blob/master/proposals/threads/Overview.md In order to implement this in Wasmtime, there are two main cases to cover: - a program may simply create a shared memory and possibly export it; this means that Wasmtime itself must be able to create shared memories - a user may create a shared memory externally and pass it in as an import during instantiation; this is the case when the program contains code like `(import "env" "memory" (memory 1 1 shared))`--this case is handled by a new Wasmtime API type--`SharedMemory` Because of the first case, this change allows any of the current memory-creation mechanisms to work as-is. Wasmtime can still create either static or dynamic memories in either on-demand or pooling modes, and any of these memories can be considered shared. When shared, the `Memory` runtime container will lock appropriately during `memory.size` and `memory.grow` operations; since all memories use this container, it is an ideal place for implementing the locking once and once only. The second case is covered by the new `SharedMemory` structure. It uses the same `Mmap` allocation under the hood as non-shared memories, but allows the user to perform the allocation externally to Wasmtime and share the memory across threads (via an `Arc`). The pointer address to the actual memory is carefully wired through and owned by the `SharedMemory` structure itself. This means that there are differing views of where to access the pointer (i.e., `VMMemoryDefinition`): for owned memories (the default), the `VMMemoryDefinition` is stored directly by the `VMContext`; in the `SharedMemory` case, however, this `VMContext` must point to this separate structure. To ensure that the `VMContext` can always point to the correct `VMMemoryDefinition`, this change alters the `VMContext` structure. Since a `SharedMemory` owns its own `VMMemoryDefinition`, the `defined_memories` table in the `VMContext` becomes a sequence of pointers--in the shared memory case, they point to the `VMMemoryDefinition` owned by the `SharedMemory` and in the owned memory case (i.e., not shared) they point to `VMMemoryDefinition`s stored in a new table, `owned_memories`. This change adds an additional indirection (through the `mut VMMemoryDefinition` pointer) that could add overhead. Using an imported memory as a proxy, we measured a 1-3% overhead of this approach on the `pulldown-cmark` benchmark. To avoid this, Cranelift-generated code will special-case the owned memory access (i.e., load a pointer directly to the `owned_memories` entry) for `memory.size` so that only shared memories (and imported memories, as before) incur the indirection cost. review: remove thread feature check * review: swap wasmtime-types dependency for existing wasmtime-environ use * review: remove unused VMMemoryUnion * review: reword cross-engine error message * review: improve tests * review: refactor to separate prevent Memory <-> SharedMemory conversion * review: into_shared_memory -> as_shared_memory * review: remove commented out code * review: limit shared min/max to 32 bits * review: skip imported memories * review: imported memories are not owned * review: remove TODO * review: document unsafe send + sync * review: add limiter assertion * review: remove TODO * review: improve tests * review: fix doc test * fix: fixes based on discussion with Alex This changes several key parts: - adds memory indexes to imports and exports - makes `VMMemoryDefinition::current_length` an atomic usize * review: add `Extern::SharedMemory` * review: remove TODO * review: atomically load from VMMemoryDescription in JIT-generated code * review: add test probing the last available memory slot across threads * fix: move assertion to new location due to rebase * fix: doc link * fix: add TODOs to c-api * fix: broken doc link * fix: modify pooling allocator messages in tests * review: make owned_memory_index panic instead of returning an option * review: clarify calculation of num_owned_memories * review: move 'use' to top of file * review: change 'const [u8]' to 'mut [u8]' * review: remove TODO * review: avoid hard-coding memory index * review: remove 'preallocation' parameter from 'Memory::_new' * fix: component model memory length * review: check that shared memory plans are static * review: ignore growth limits for shared memory * review: improve atomic store comment * review: add FIXME for memory growth failure * review: add comment about absence of bounds-checked 'memory.size' * review: make 'current_length()' doc comment more precise * review: more comments related to memory.size non-determinism * review: make 'vmmemory' unreachable for shared memory * review: move code around * review: thread plan through to 'wrap()' * review: disallow shared memory allocation with the pooling allocator	2 years ago
wasmtime-publish	55946704cb	Bump Wasmtime to 0.39.0 (#4225 ) Co-authored-by: Wasmtime Publish <wasmtime-publish@users.noreply.github.com>	2 years ago
Alex Crichton	2af358dd9c	Add a `VMComponentContext` type and create it on instantiation (#4215 ) * Add a `VMComponentContext` type and create it on instantiation This commit fills out the `wasmtime-runtime` crate's support for `VMComponentContext` and creates it as part of the instantiation process. This moves a few maps that were temporarily allocated in an `InstanceData` into the `VMComponentContext` and additionally reads the canonical options data from there instead. This type still won't be used in its "full glory" until the lowering of host functions is completely implemented, however, which will be coming in a future commit. * Remove `DerefMut` implementation * Rebase conflicts	2 years ago
Alex Crichton	3ed6fae7b3	Add trampoline compilation support for lowered imports (#4206 ) * Add trampoline compilation support for lowered imports This commit adds support to the component model implementation for compiling trampolines suitable for calling host imports. Currently this is purely just the compilation side of things, modifying the wasmtime-cranelift crate and additionally filling out a new `VMComponentOffsets` type (similar to `VMOffsets`). The actual creation of a `VMComponentContext` is still not performed and will be a subsequent PR. Internally though some tests are actually possible with this where we at least assert that compilation of a component and creation of everything in-memory doesn't panic or trip any assertions, so some tests are added here for that as well. * Fix some test errors	2 years ago
Alex Crichton	b49c5c878e	Implement module imports into components (#4208 ) * Implement module imports into components As a step towards implementing function imports into a component this commit implements importing modules into a component. This fills out missing pieces of functionality such as exporting modules as well. The previous translation code had initial support for translating imported modules but some of the AST type information was restructured with feedback from this implementation, namely splitting the `InstantiateModule` initializer into separate upvar/import variants to clarify that the item orderings for imports are resolved differently at runtime. Much of this commit is also adding infrastructure for any imports at all into a component. For example a `Linker` type (analagous to `wasmtime::Linker`) was added here as well. For now this type is quite limited due to the inability to define host functions (it can only work with instances and instances-of-modules) but it's enough to start writing `.wast` tests which exercise lots of module-related functionality. Fix a warning	2 years ago
Alex Crichton	9f5f978baa	Fix double-counting imports in `VMOffsets` calculations (#4209 ) * Fix double-counting imports in `VMOffsets` calculations This fixes an oversight in the initial creation of `VMOffsets` for a module to avoid double-counting imported globals, tables, and memories for calculating the size of the `VMContext`. Prior to this PR imported items are accidentally also counted as defined items for sizing calculations meaning that when a memory is imported but not defined, for example, the `VMContext` will have a space for an inline `VMMemoryDefinition` when it doesn't need to. Auditing where all this relates to it appears that the only issue from this mistake is that `VMContext` is a bit larger than it would otherwise need to be. Extra slots are uninitialized memory but nothing in Wasmtime ever actually accesses the memory either, so it should be harmless to have extra space here. Nevertheless it seems better to shrink the size as much as possible to avoid wasting space where we can. * Fix tests	2 years ago
Alex Crichton	0cf0230432	Add dataflow processing to component translation for imports (#4205 ) This commit enhances the processing of components to track all the dataflow for the processing of `canon.lower`'d functions. At the same time this fills out a few other missing details to component processing such as aliasing from some kinds of component instances and similar. The major changes contained within this are the updates the `info` submodule which has the AST of component type information. This has been significantly refactored to prepare for representing lowered functions and implementing those. The major change is from an `Instantiation` list to an `Initializer` list which abstractly represents a few other initialization actions. This work is split off from my main work to implement component imports of host functions. This is incomplete in the sense that it doesn't actually finish everything necessary to define host functions and import them into components. Instead this is only the changes necessary at the translation layer (so far). Consequently this commit does not have tests and also namely doesn't actually include the `VMComponentContext` initialization and usage. The full body of work is still a bit too messy to PR just yet so I'm hoping that this is a slimmed-down-enough piece to adequately be reviewed.	2 years ago
Alex Crichton	f638b390b6	Refactor some internals of wasmtime-cranelift (#4202 ) * Split `wasm_to_host_trampoline` into pieces In the upcoming component model supoprt for imports my plan is to reuse some of these pieces but not the entirety of the current `wasm_to_host_trampoline`. In an effort to make that diff smaller this commit splits up the function preemptively into pieces to get reused later. * Delete unused `for_each_libcall` macros Came across this when working in the object support for cranelift. * Refactor some object creation details This commit refactors some of the internals around creating an object file in the wasmtime-cranelift integration. The old `ObjectBuilder` is now named `ModuleTextBuilder` and is only used to create the text section rather than other sections too. This helps maintain the invariant that the unwind information section is placed directly after the text section without having an odd API for doing this. Additionally the unwind information creation is moved externally from the `ModuleTextBuilder` to a standalone structure. This separate structure is currently in use in the component model work I'm doing although I may change that to using the `ModuleTextBuilder` instead. In any case it seemed nice to encapsulate all of the unwinding information into one standalone structure. Finally, the insertion of native debug information has been refactored to happen in a new `append_dwarf` method to keep all the dwarf-related stuff together in one place as much as possible. * Fix a doctest * Fix a typo	2 years ago
Alex Crichton	2a4851ad2b	Change some `VMContext` pointers to `()` pointers (#4190 ) * Change some `VMContext` pointers to `()` pointers This commit is motivated by my work on the component model implementation for imported functions. Currently all context pointers in wasm are `mut VMContext` but with the component model my plan is to make some pointers instead along the lines of `mut VMComponentContext`. In doing this though one worry I have is breaking what has otherwise been a core invariant of Wasmtime for quite some time, subtly introducing bugs by accident. To help assuage my worry I've opted here to erase knowledge of `mut VMContext` where possible. Instead where applicable a context pointer is simply known as `mut ()` and the embedder doesn't actually know anything about this context beyond the value of the pointer. This will help prevent Wasmtime from accidentally ever trying to interpret this context pointer as an actual `VMContext` when it might instead be a `VMComponentContext`. Overall this was a pretty smooth transition. The main change here is that the `VMTrampoline` (now sporting more docs) has its first argument changed to `mut ()`. The second argument, the caller context, is still configured as `mut VMContext` though because all functions are always called from wasm still. Eventually for component-to-component calls I think we'll probably "fake" the second argument as the same as the first argument, losing track of the original caller, as an intentional way of isolating components from each other. Along the way there are a few host locations which do actually assume that the first argument is indeed a `VMContext`. These are valid assumptions that are upheld from a correct implementation, but I opted to add a "magic" field to `VMContext` to assert this in debug mode. This new "magic" field is inintialized during normal vmcontext initialization and it's checked whenever a `VMContext` is reinterpreted as an `Instance` (but only in debug mode). My hope here is to catch any future accidental mistakes, if ever. * Use a VMOpaqueContext wrapper * Fix typos	2 years ago
Alex Crichton	140b83597b	components: Implement the ability to call component exports (#4039 ) * components: Implement the ability to call component exports This commit is an implementation of the typed method of calling component exports. This is intended to represent the most efficient way of calling a component in Wasmtime, similar to what `TypedFunc` represents today for core wasm. Internally this contains all the traits and implementations necessary to invoke component exports with any type signature (e.g. arbitrary parameters and/or results). The expectation is that for results we'll reuse all of this infrastructure except in reverse (arguments and results will be swapped when defining imports). Some features of this implementation are: * Arbitrary type hierarchies are supported * The Rust-standard `Option`, `Result`, `String`, `Vec<T>`, and tuple types all map down to the corresponding type in the component model. * Basic utf-16 string support is implemented as proof-of-concept to show what handling might look like. This will need further testing and benchmarking. * Arguments can be behind "smart pointers", so for example `&Rc<Arc<[u8]>>` corresponds to `list<u8>` in interface types. * Bulk copies from linear memory never happen unless explicitly instructed to do so. The goal of this commit is to create the ability to actually invoke wasm components. This represents what is expected to be the performance threshold for these calls where it ideally should be optimal how WebAssembly is invoked. One major missing piece of this is a `#[derive]` of some sort to generate Rust types for arbitrary `.wit` types such as custom records, variants, flags, unions, etc. The current trait impls for tuples and `Result<T, E>` are expected to have fleshed out most of what such a derive would look like. There are some downsides and missing pieces to this commit and method of calling components, however, such as: Passing `&[u8]` to WebAssembly is currently not optimal. Ideally this compiles down to a `memcpy`-equivalent somewhere but that currently doesn't happen due to all the bounds checks of copying data into memory. I have been unsuccessful so far at getting these bounds checks to be removed. * There is no finalization at this time (the "post return" functionality in the canonical ABI). Implementing this should be relatively straightforward but at this time requires `wasmparser` changes to catch up with the current canonical ABI. * There is no guarantee that results of a wasm function will be validated. As results are consumed they are validated but this means that if function returns an invalid string which the host doesn't look at then no trap will be generated. This is probably not the intended semantics of hosts in the component model. * At this time there's no support for memory64 memories, just a bunch of `FIXME`s to get around to. It's expected that this won't be too onerous, however. Some extra care will need to ensure that the various methods related to size/alignment all optimize to the same thing they do today (e.g. constants). * The return value of a typed component function is either `T` or `Value<T>`, and it depends on the ABI details of `T` and whether it takes up more than one return value slot or not. This is an ABI-implementation detail which is being forced through to the API layer which is pretty unfortunate. For example if you say the return value of a function is `(u8, u32)` then it's a runtime type-checking error. I don't know of a great way to solve this at this time. Overall I'm feeling optimistic about this trajectory of implementing value lifting/lowering in Wasmtime. While there are a number of downsides none seem completely insurmountable. There's naturally still a good deal of work with the component model but this should be a significant step up towards implementing and testing the component model. * Review comments * Write tests for calling functions This commit adds a new test file for actually executing functions and testing their results. This is not written as a `.wast` test yet since it's not 100% clear if that's the best way to do that for now (given that dynamic signatures aren't supported yet). The tests themselves could all largely be translated to `.wast` testing in the future, though, if supported. Along the way a number of minor issues were fixed with lowerings with the bugs exposed here. * Fix an endian mistake * Fix a typo and the `memory.fill` instruction	2 years ago
Alex Crichton	fcf6208750	Initial skeleton of some component model processing (#4005 ) * Initial skeleton of some component model processing This commit is the first of what will likely be many to implement the component model proposal in Wasmtime. This will be structured as a series of incremental commits, most of which haven't been written yet. My hope is to make this incremental and over time to make this easier to review and easier to test each step in isolation. Here much of the skeleton of how components are going to work in Wasmtime is sketched out. This is not a complete implementation of the component model so it's not all that useful yet, but some things you can do are: * Process the type section into a representation amenable for working with in Wasmtime. * Process the module section and register core wasm modules. * Process the instance section for core wasm modules. * Process core wasm module imports. * Process core wasm instance aliasing. * Ability to compile a component with core wasm embedded. * Ability to instantiate a component with no imports. * Ability to get functions from this component. This is already starting to diverge from the previous module linking representation where a `Component` will try to avoid unnecessary metadata about the component and instead internally only have the bare minimum necessary to instantiate the module. My hope is we can avoid constructing most of the index spaces during instantiation only for it to all ge thrown away. Additionally I'm predicting that we'll need to see through processing where possible to know how to generate adapters and where they are fused. At this time you can't actually call a component's functions, and that's the next PR that I would like to make. * Add tests for the component model support This commit uses the recently updated wasm-tools crates to add tests for the component model added in the previous commit. This involved updating the `wasmtime-wast` crate for component-model changes. Currently the component support there is quite primitive, but enough to at least instantiate components and verify the internals of Wasmtime are all working correctly. Additionally some simple tests for the embedding API have also been added.	3 years ago
Alex Crichton	89ccc56e46	Update the wasm-tools family of crates (#4165 ) * Update the wasm-tools family of crates This commit updates these crates as used by Wasmtime for the recently published versions to pull in changes necessary to support the component model. I've split this out from #4005 to make it clear what's impacted here and #4005 can simply rebase on top of this to pick up the necessary changes. * More test fixes	3 years ago
Alex Crichton	ccf834b473	Fix an issue where massive memory images are created (#4112 ) This commit fixes an issue introduced in #4046 where the checks for ensuring that the memory initialization image for a module was constrained in its size failed to trigger and a very small module could produce an arbitrarily large memory image. The bug in question was that if a module only had empty data segments at arbitrarily small and large addresses then the loop which checks whether or not the image is allowed was skipped entirely since it was seen that the memory had no data size. The fix here is to skip segments that are empty to ensure that if the validation loop is skipped then no data segments will be processed to create the image (and the module won't end up having an image in the end).	3 years ago
wasmtime-publish	9a6854456d	Bump Wasmtime to 0.38.0 (#4103 ) Co-authored-by: Wasmtime Publish <wasmtime-publish@users.noreply.github.com>	3 years ago
Alex Crichton	7fdc616368	Remove the `Paged` memory initialization variant (#4046 ) * Remove the `Paged` memory initialization variant This commit simplifies the `MemoryInitialization` enum by removing the `Paged` variant. The `Paged` variant was originally added for uffd, but that support has now been removed in #4040. This is no longer necessary but is still used as an intermediate step of becoming a `Static` variant of initialized memory (which copy-on-write uses). As a result this commit largely modifies the static initialization of memory steps and folds the two methods together. * Apply suggestions from code review Co-authored-by: Peter Huene <peter@huene.dev> Co-authored-by: Peter Huene <peter@huene.dev>	3 years ago
Alex Crichton	871a9d93f2	Update some dependencies in `Cargo.lock` (#4081 ) * Run a `cargo update` over our dependencies This'll notably fix a `cargo audit` error where we have a pinned version of the `regex` crate which has a CVE assigned to it. * Update to `object` and `hashbrown` crates Prune some duplicate versions showing up from the previous `cargo update`	3 years ago
Alex Crichton	d147802d51	Update wasm-tools crates (#3997 ) * Update wasm-tools crates This commit updates the wasm-tools family of crates as used in Wasmtime. Notably this brings in the update which removes module linking support as well as a number of internal refactorings around names and such within wasmparser itself. This updates all of the wasm translation support which binds to wasmparser as appropriate. Other crates all had API-compatible changes for at least what Wasmtime used so no further changes were necessary beyond updating version requirements. * Update a test expectation	3 years ago
wasmtime-publish	78a595ac88	Bump Wasmtime to 0.37.0 (#3994 ) Co-authored-by: Wasmtime Publish <wasmtime-publish@users.noreply.github.com>	3 years ago
Alex Crichton	7b5176baea	Upgrade all crates to the Rust 2021 edition (#3991 ) * Upgrade all crates to the Rust 2021 edition I've personally started using the new format strings for things like `panic!("some message {foo}")` or similar and have been upgrading crates on a case-by-case basis, but I think it probably makes more sense to go ahead and blanket upgrade everything so 2021 features are always available. * Fix compile of the C API * Fix a warning * Fix another warning	3 years ago
Alex Crichton	c89dc55108	Add a two-week delay to Wasmtime's release process (#3955 ) * Bump to 0.36.0 * Add a two-week delay to Wasmtime's release process This commit is a proposal to update Wasmtime's release process with a two-week delay from branching a release until it's actually officially released. We've had two issues lately that came up which led to this proposal: * In #3915 it was realized that changes just before the 0.35.0 release weren't enough for an embedding use case, but the PR didn't meet the expectations for a full patch release. * At Fastly we were about to start rolling out a new version of Wasmtime when over the weekend the fuzz bug #3951 was found. This led to the desire internally to have a "must have been fuzzed for this long" period of time for Wasmtime changes which we felt were better reflected in the release process itself rather than something about Fastly's own integration with Wasmtime. This commit updates the automation for releases to unconditionally create a `release-X.Y.Z` branch on the 5th of every month. The actual release from this branch is then performed on the 20th of every month, roughly two weeks later. This should provide a period of time to ensure that all changes in a release are fuzzed for at least two weeks and avoid any further surprises. This should also help with any last-minute changes made just before a release if they need tweaking since backporting to a not-yet-released branch is much easier. Overall there are some new properties about Wasmtime with this proposal as well: * The `main` branch will always have a section in `RELEASES.md` which is listed as "Unreleased" for us to fill out. * The `main` branch will always be a version ahead of the latest release. For example it will be bump pre-emptively as part of the release process on the 5th where if `release-2.0.0` was created then the `main` branch will have 3.0.0 Wasmtime. * Dates for major versions are automatically updated in the `RELEASES.md` notes. The associated documentation for our release process is updated and the various scripts should all be updated now as well with this commit. * Add notes on a security patch * Clarify security fixes shouldn't be previewed early on CI	3 years ago
Alex Crichton	453feb6f82	Remove some dead code (#3970 ) This commit removes methods that are never used between crates or trait impls like `Clone` which may have been used one day but are no longer used.	3 years ago
Alex Crichton	d1d10dc8da	Refactor the `TypeTables` type (#3971 ) * Remove duplicate `TypeTables` type This was once needed historically but it is no longer needed. * Make the internals of `TypeTables` private Instead of reaching internally for the `wasm_signatures` map an `Index` implementation now exists to indirect accesses through the type of the index being accessed. For the component model this table of types will grow a number of other tables and this'll assist in consuming sites not having to worry so much about which map they're reaching into.	3 years ago
Alex Crichton	76b82910c9	Remove the module linking implementation in Wasmtime (#3958 ) * Remove the module linking implementation in Wasmtime This commit removes the experimental implementation of the module linking WebAssembly proposal from Wasmtime. The module linking is no longer intended for core WebAssembly but is instead incorporated into the component model now at this point. This means that very large parts of Wasmtime's implementation of module linking are no longer applicable and would change greatly with an implementation of the component model. The main purpose of this is to remove Wasmtime's reliance on the support for module-linking in `wasmparser` and tooling crates. With this reliance removed we can move over to the `component-model` branch of `wasmparser` and use the updated support for the component model. Additionally given the trajectory of the component model proposal the embedding API of Wasmtime will not look like what it looks like today for WebAssembly. For example the core wasm `Instance` will not change and instead a `Component` is likely to be added instead. Some more rationale for this is in #3941, but the basic idea is that I feel that it's not going to be viable to develop support for the component model on a non-`main` branch of Wasmtime. Additionaly I don't think it's viable, for the same reasons as `wasm-tools`, to support the old module linking proposal and the new component model at the same time. This commit takes a moment to not only delete the existing module linking implementation but some abstractions are also simplified. For example module serialization is a bit simpler that there's only one module. Additionally instantiation is much simpler since the only initializer we have to deal with are imports and nothing else. Closes #3941 * Fix doc link * Update comments	3 years ago
Alex Crichton	c22033bf93	Delete historical interruptable support in Wasmtime (#3925 ) * Delete historical interruptable support in Wasmtime This commit removes the `Config::interruptable` configuration along with the `InterruptHandle` type from the `wasmtime` crate. The original support for adding interruption to WebAssembly was added pretty early on in the history of Wasmtime when there was no other method to prevent an infinite loop from the host. Nowadays, however, there are alternative methods for interruption such as fuel or epoch-based interruption. One of the major downsides of `Config::interruptable` is that even when it's not enabled it forces an atomic swap to happen when entering WebAssembly code. This technically could be a non-atomic swap if the configuration option isn't enabled but that produces even more branch-y code on entry into WebAssembly which is already something we try to optimize. Calling into WebAssembly is on the order of a dozens of nanoseconds at this time and an atomic swap, even uncontended, can add up to 5ns on some platforms. The main goal of this PR is to remove this atomic swap on entry into WebAssembly. This is done by removing the `Config::interruptable` field entirely, moving all existing consumers to epochs instead which are suitable for the same purposes. This means that the stack overflow check is no longer entangled with the interruption check and perhaps one day we could continue to optimize that further as well. Some consequences of this change are: * Epochs are now the only method of remote-thread interruption. * There are no more Wasmtime traps that produces the `Interrupted` trap code, although we may wish to move future traps to this so I left it in place. * The C API support for interrupt handles was also removed and bindings for epoch methods were added. * Function-entry checks for interruption are a tiny bit less efficient since one check is performed for the stack limit and a second is performed for the epoch as opposed to the `Config::interruptable` style of bundling the stack limit and the interrupt check in one. It's expected though that this is likely to not really be measurable. * The old `VMInterrupts` structure is renamed to `VMRuntimeLimits`.	3 years ago
Alex Crichton	2f4419cc6c	Implement runtime checks for compilation settings (#3899 ) * Implement runtime checks for compilation settings This commit fills out a few FIXME annotations by implementing run-time checks that when a `Module` is created it has compatible codegen settings for the current host (as `Module` is proof of "this code can run"). This is done by implementing new `Engine`-level methods which validate compiler settings. These settings are validated on `Module::new` as well as when loading serialized modules. Settings are split into two categories, one for "shared" top-level settings and one for ISA-specific settings. Both categories now have allow-lists hardcoded into `Engine` which indicate the acceptable values for each setting (if applicable). ISA-specific settings are checked with the Rust standard library's `std::is_x86_feature_detected!` macro. Other macros for other platforms are not stable at this time but can be added here if necessary. Closes #3897 * Fix fall-through logic to actually be correct * Use a `OnceCell`, not an `AtomicBool` * Fix some broken tests	3 years ago
wasmtime-publish	9137b4a50e	Bump Wasmtime to 0.35.0 (#3885 ) [automatically-tag-and-release-this-commit] Co-authored-by: Wasmtime Publish <wasmtime-publish@users.noreply.github.com>	3 years ago

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349 Commits (release-6.0.0)