wasm Backend Link Options

Configurable Options

• The exports option is used to specify the function names exported by the wasm backend.

  For example, in the following configuration, the hello function from the current package is exported as the hello function in the wasm module, and the foo function is exported as the bar function in the wasm module. In the wasm host, the hello and bar functions can be called to invoke the hello and foo functions from the current package.

  {
    "link": {
      "wasm": {
        "exports": [
          "hello",
          "foo:bar"
        ]
      }
    }
  }
  

• The heap-start-address option is used to specify the starting address of the linear memory that can be used when compiling to the wasm backend.

  For example, the following configuration sets the starting address of the linear memory to 1024.

  {
    "link": {
      "wasm": {
        "heap-start-address": 1024
      }
    }
  }
  

• The import-memory option is used to specify the linear memory imported by the wasm module.

  For example, the following configuration specifies that the linear memory imported by the wasm module is the memory variable from the env module.

  {
    "link": {
      "wasm": {
        "import-memory": {
          "module": "env",
          "name": "memory"
        }
      }
    }
  }
  

• The export-memory-name option is used to specify the name of the linear memory exported by the wasm module.

  {
    "link": {
      "wasm": {
        "export-memory-name": "memory"
      }
    }
  }