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In some scenarios there may be lots of callings to AOT/JIT functions from the host embedder, which expects good performance for the calling process, while in the current implementation, runtime calls the wasm_runtime_invoke_native to prepare the array of registers and stacks for the invokeNative assemble code, and the latter then puts the elements in the array to physical registers and native stacks and calls the AOT/JIT function, there may be many data copying and handlings which impact the performance. This PR registers some quick AOT/JIT entries for some simple wasm signatures, and let runtime call the entry to directly invoke the AOT/JIT function instead of calling wasm_runtime_invoke_native, which speedups the calling process. We may extend the mechanism next to allow the developer to register his quick AOT/JIT entries to speedup the calling process of invoking the AOT/JIT functions for some specific signatures.
WebAssembly Micro Runtime
A Bytecode Alliance project
Build WAMR | Build AOT Compiler | Embed WAMR | Export Native API | Build Wasm Apps | Samples
WebAssembly Micro Runtime (WAMR) is a lightweight standalone WebAssembly (Wasm) runtime with small footprint, high performance and highly configurable features for applications cross from embedded, IoT, edge to Trusted Execution Environment (TEE), smart contract, cloud native and so on. It includes a few parts as below:
- VMcore: A set of runtime libraries for loading and running Wasm modules. It supports several execution modes including interpreter, Ahead-of-Time compilation(AoT) and Just-in-Time compilation (JIT). The WAMR supports two JIT tiers - Fast JIT, LLVM JIT, and dynamic tier-up from Fast JIT to LLVM JIT.
- iwasm: The executable binary built with WAMR VMcore supports WASI and command line interface.
- wamrc: The AOT compiler to compile Wasm file into AOT file
- Useful components and tools for building real solutions with WAMR vmcore:
- App-framework: A framework for supporting APIs for the Wasm applications
- App-manager: a framework for dynamical loading the Wasm module remotely
- WAMR-IDE: An experimental VSCode extension for developping WebAssembly applications with C/C++
Key features
- Full compliant to the W3C Wasm MVP
- Small runtime binary size (~85K for interpreter and ~50K for AOT) and low memory usage
- Near to native speed by AOT and JIT
- Self-implemented AOT module loader to enable AOT working on Linux, Windows, MacOS, Android, SGX and MCU systems
- Choices of Wasm application libc support: the built-in libc subset for the embedded environment or WASI for the standard libc
- The simple C APIs to embed WAMR into host environment, see how to integrate WAMR and the API list
- The mechanism to export native APIs to Wasm applications, see how to register native APIs
- Multiple modules as dependencies, ref to document and sample
- Multi-thread, pthread APIs and thread management, ref to document and sample
- wasi-threads, ref to document and sample
- Linux SGX (Intel Software Guard Extension) support, ref to document
- Source debugging support, ref to document
- XIP (Execution In Place) support, ref to document
- Berkeley/Posix Socket support, ref to document and sample
- Multi-tier JIT and Running mode control
- Language bindings: Go, Python
Wasm post-MVP features
- wasm-c-api, ref to document and sample
- 128-bit SIMD, ref to samples/workload
- Reference Types, ref to document and sample
- Non-trapping float-to-int conversions
- Sign-extension operators, Bulk memory operations
- Multi-value, Tail-call, Shared memory
Supported architectures and platforms
The WAMR VMcore supports the following architectures:
- X86-64, X86-32
- ARM, THUMB (ARMV7 Cortex-M7 and Cortex-A15 are tested)
- AArch64 (Cortex-A57 and Cortex-A53 are tested)
- RISCV64, RISCV32 (RISC-V LP64 and RISC-V LP64D are tested)
- XTENSA, MIPS, ARC
The following platforms are supported, click each link below for how to build iwasm on that platform. Refer to WAMR porting guide for how to port WAMR to a new platform.
- Linux, Linux SGX (Intel Software Guard Extension), MacOS, Android, Windows, Windows (MinGW)
- Zephyr, AliOS-Things, VxWorks, NuttX, RT-Thread, ESP-IDF
Getting started
- Build VM core and Build wamrc AOT compiler
- Build iwasm (mini product): Linux, SGX, MacOS and Windows
- Embed into C/C++, Embed into Python, Embed into Go
- Register native APIs for Wasm applications
- Build wamrc AOT compiler
- Build Wasm applications
- Port WAMR to a new platform
- VS Code development container
- Samples and Benchmarks
Performance and memory
- Blog: The WAMR memory model
- Blog: Understand WAMR heaps and stacks
- Blog: Introduction to WAMR running modes
- Memory usage tunning: the memory model and how to tune the memory usage
- Memory usage profiling: how to profile the memory usage
- Performance tunning: how to tune the performance
- Benchmarks: checkout these links for how to run the benchmarks: PolyBench, CoreMark, Sightglass, JetStream2
- Performance and footprint data: the performance and footprint data
Project Technical Steering Committee
The WAMR PTSC Charter governs the operations of the project TSC. The current TSC members:
- dongsheng28849455 - Dongsheng Yan, dongsheng.yan@sony.com
- loganek - Marcin Kolny, mkolny@amazon.co.uk
- lum1n0us - Liang He， liang.he@intel.com
- no1wudi Qi Huang, huangqi3@xiaomi.com
- qinxk-inter - Xiaokang Qin， xiaokang.qxk@antgroup.com
- ttrenner - Trenner, Thomas， trenner.thomas@siemens.com
- wei-tang - Wei Tang， tangwei.tang@antgroup.com
- wenyongh - Wenyong Huang， wenyong.huang@intel.com
- woodsmc - Woods, Chris， chris.woods@siemens.com
- xujuntwt95329 - Jun Xu， Jun1.Xu@intel.com
- xwang98 - Xin Wang， xin.wang@intel.com (chair)
- yamt - Takashi Yamamoto, yamamoto@midokura.com
License
WAMR uses the same license as LLVM: the Apache 2.0 license with the LLVM
exception. See the LICENSE file for details. This license allows you to freely
use, modify, distribute and sell your own products based on WAMR.
Any contributions you make will be under the same license.