{"id":55147,"date":"2020-01-13T00:00:00","date_gmt":"2020-01-12T21:00:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/pervyj-vypusk-wasm3-bystrogo-interpretatora-webassembly"},"modified":"2020-02-18T14:03:13","modified_gmt":"2020-02-18T11:03:13","slug":"pervyj-vypusk-wasm3-bystrogo-interpretatora-webassembly","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pt\/blog\/news\/pervyj-vypusk-wasm3-bystrogo-interpretatora-webassembly","title":{"rendered":"Primeira vers\u00e3o do wasm3, um interpretador r\u00e1pido de WebAssembly","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Dispon\u00edvel<\/a><\/noindex> o primeiro epis\u00f3dio wasm3<\/a><\/noindex>, um interpretador de c\u00f3digo intermedi\u00e1rio WebAssembly muito r\u00e1pido, principalmente projetado para executar aplicativos WebAssembly em microcontroladores e plataformas que n\u00e3o t\u00eam implementa\u00e7\u00e3o JIT para WebAssembly, que possuem mem\u00f3ria insuficiente para executar JIT ou que n\u00e3o permitem a cria\u00e7\u00e3o de p\u00e1ginas de mem\u00f3ria execut\u00e1veis necess\u00e1rias para a implementa\u00e7\u00e3o JIT. O c\u00f3digo do projeto \u00e9 escrito em C e \u00e9 distribu\u00eddo<\/a><\/noindex> sob a licen\u00e7a MIT.<\/p>\n

Wasm3 passa testes<\/a><\/noindex> na compatibilidade com a especifica\u00e7\u00e3o WebAssembly 1.0 e pode ser usado para executar muitos aplicativos WASI, fornecendo desempenho apenas 4-5 vezes inferior aos motores JIT (liftoff<\/a><\/noindex>, cranelift<\/a><\/noindex>) e 11,5 vezes inferior \u00e0 execu\u00e7\u00e3o de c\u00f3digo nativo. Comparado com outros interpretadores WebAssembly (wac<\/a><\/noindex>, life<\/a><\/noindex>, wasm-micro-runtime<\/a><\/noindex>), wasm3 foi at\u00e9 15,8 vezes mais r\u00e1pido.<\/p>\n

Para operar, wasm3 necessita de 64Kb de mem\u00f3ria para c\u00f3digo e 10Kb de RAM, permitindo que o projeto execute aplicativos compilados em WebAssembly em microcontroladores<\/a><\/noindex>, como Arduino MKR*, Arduino Due, Particle Photon, ESP8266, ESP32, Air602 (W600), nRF52, nRF51 Blue Pill (STM32F103C8T6), MXChip AZ3166 (EMW3166),
\nMaix (K210), HiFive1 (E310), Fomu (ICE40UP5K) e ATmega1284, assim como em placas e computadores baseados em arquiteturas x86, x64, ARM, MIPS, RISC-V e Xtensa. Os sistemas operacionais suportados incluem Linux (incluindo roteadores baseados em OpenWRT), Windows, macOS, Android e iOS. Tamb\u00e9m \u00e9 poss\u00edvel compilar wasm3 em c\u00f3digo intermedi\u00e1rio WebAssembly para executar o interpretador no navegador ou para execu\u00e7\u00e3o interna (self-hosting).<\/p>\n

O alto desempenho \u00e9 alcan\u00e7ado atrav\u00e9s do uso de t\u00e9cnicas no interpretador Massey Meta Machine<\/a><\/noindex> (M3), onde a tradu\u00e7\u00e3o antecipada de bytecode em opera\u00e7\u00f5es mais eficientes \u00e9 realizada para reduzir a sobrecarga da decodifica\u00e7\u00e3o, gerando c\u00f3digo de m\u00e1quina pseudo e transformando o modelo de execu\u00e7\u00e3o da m\u00e1quina virtual de pilha em uma abordagem de registrador mais eficiente. As opera\u00e7\u00f5es em M3 s\u00e3o fun\u00e7\u00f5es C, cujos argumentos s\u00e3o os registradores da m\u00e1quina virtual, que podem ser refletidos nos registradores da CPU. Sequ\u00eancias frequentes de opera\u00e7\u00f5es para otimiza\u00e7\u00e3o s\u00e3o transformadas em opera\u00e7\u00f5es resumidas.<\/p>\n

Adicionalmente, pode-se destacar resultados da pesquisa<\/a><\/noindex> dissemina\u00e7\u00e3o
\nWebAssembly na Web. Ap\u00f3s analisar 948 mil dos sites mais populares segundo o ranking da Alexa, os pesquisadores descobriram que o WebAssembly \u00e9 utilizado em 1639 sites (0,17%), ou seja, em 1 a cada 600 sites. No total, foram identificados 1950 m\u00f3dulos WebAssembly em sites, dos quais 150 s\u00e3o \u00fanicos. Ao examinar a \u00e1rea de aplica\u00e7\u00e3o do WebAssembly, foram feitas conclus\u00f5es preocupantes \u2014 em mais de 50% dos casos, o WebAssembly foi usado para fins maliciosos, como minera\u00e7\u00e3o de criptomoedas (55,7%) e oculta\u00e7\u00e3o de c\u00f3digo de scripts maliciosos (0,2%). Entre as aplica\u00e7\u00f5es leg\u00edtimas do WebAssembly, destacam-se a execu\u00e7\u00e3o de bibliotecas (38,8%), a cria\u00e7\u00e3o de jogos (3,5%) e a execu\u00e7\u00e3o de c\u00f3digo personalizado, n\u00e3o escrito em JavaScript (0,9%). Em 14,9% dos casos, o WebAssembly foi utilizado para an\u00e1lise do ambiente para identifica\u00e7\u00e3o do usu\u00e1rio (fingerprinting).
\n

\"Primeira<\/center><\/p>\n

<\/a><\/noindex><\/p>\n

Fonte: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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