将 C++ 代码转换为 webassembly 的脚本不会终止

Question

我想将 CPP 文件编译为 Web 程序集。我在以下 link

中使用脚本

https://github.com/wasdk/wasmexplorer-service/tree/master/scripts

我在 Linux OS

中使用以下命令

../scripts/compile2.sh ../test.cpp "-fno-verbose-asm -03 -std=c++98" 2>&1

命令永远不会终止。我已经尝试了所有选项组合。任何人都可以在这方面指导我吗？或者任何其他方式将 C++ 代码转换为相应的 Web 汇编代码（帮我设计一个独立的应用程序）。

文件内容如下：

double fact(int i) {
  long long n = 1;
  for (;i > 0; i--) {
    n *= i;
  }
  return (double)n;
}

我的预期输出如下（来自https://mbebenita.github.io/WasmExplorer/）

(module
 (table 0 anyfunc)
 (memory [=11=] 1)
 (export "memory" (memory [=11=]))
 (export "_Z4facti" (func $_Z4facti))
 (func $_Z4facti (; 0 ;) (param [=11=] i32) (result f64)
  (local  i64)
  (local  i64)
  (block $label[=11=]
   (br_if $label[=11=]
    (i32.lt_s
     (get_local [=11=])
     (i32.const 1)
    )
   )
   (set_local 
    (i64.add
     (i64.extend_s/i32
      (get_local [=11=])
     )
     (i64.const 1)
    )
   )
   (set_local 
    (i64.const 1)
   )
   (loop $label
    (set_local 
     (i64.mul
      (get_local )
      (tee_local 
       (i64.add
        (get_local )
        (i64.const -1)
       )
      )
     )
    )
    (br_if $label
     (i64.gt_s
      (get_local )
      (i64.const 1)
     )
    )
   )
   (return
    (f64.convert_s/i64
     (get_local )
    )
   )
  )
  (f64.const 1)
 )
)

Answer 1

运行下面的代码适合我

/*
# run me with 'bash test.cpp'
clang++ [=10=] --target=wasm32-unknown-unknown-wasm -nostartfiles -nostdlib -Wl,--no-entry -Wl,--export-all -o test.wasm

exit 1
*/

extern "C" double fact(int i) {
  long long n = 1;
  for (;i > 0; i--) {
    n *= i;
  }
  return (double)n;
}

测试

<!DOCTYPE html>
<script type="module">
  async function init() {
    const { instance } = await WebAssembly.instantiateStreaming(fetch("./test.wasm"));
    console.log(instance.exports.fact(6));
  }
  init();
</script>

将 C++ 代码转换为 webassembly 的脚本不会终止

Script to transform C++ code to webassembly is not terminating

c++

webassembly