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libstruct_indirect_api_spec.md

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libstruct_indirect API spec

Overview

The libstruct_indirect API is used to access WasmGC struct fields through index calculated during runtime. The API is designed to be used by ts2wasm-compiler to support interface type.

These APIs are used to emulate the behaviour of the proposed struct.get/set_indirect opcode, if these opcodes are accepted by the proposal and supported by runtime, the libstruct_indirect API will no longer be required.

Dependent status

These APIs are required by interface type, the absence of this set of APIs would prevent apps utilizing interface type from functioning correctly.

Module name

libstruct_indirect

API

  • struct_get_indirect_i32

    • Description
      • Get i32 field from WasmGC struct
    • Parameters
      • structref: the WasmGC struct
      • i32: field index
    • Return
      • i32: the field value

  • struct_get_indirect_i64

    • Description
      • Get i64 field from WasmGC struct
    • Parameters
      • structref: the WasmGC struct
      • i32: field index
    • Return
      • i64: the field value

  • struct_get_indirect_f32

    • Description
      • Get f32 field from WasmGC struct
    • Parameters
      • structref: the WasmGC struct
      • i32: field index
    • Return
      • f32: the field value

  • struct_get_indirect_f64

    • Description
      • Get f64 field from WasmGC struct
    • Parameters
      • structref: the WasmGC struct
      • i32: field index
    • Return
      • f64: the field value

  • struct_get_indirect_anyref

    • Description
      • Get anyref field from WasmGC struct
    • Parameters
      • structref: the WasmGC struct
      • i32: field index
    • Return
      • anyref: the field value

  • struct_get_indirect_funcref

    • Description
      • Get funcref field from WasmGC struct
    • Parameters
      • structref: the WasmGC struct
      • i32: field index
    • Return
      • funcref: the field value

  • struct_set_indirect_i32

    • Description
      • Set i32 field of WasmGC struct
    • Parameters
      • structref: the WasmGC struct
      • i32: field index
      • i32: field value

  • struct_set_indirect_i64

    • Description
      • Set i64 field of WasmGC struct
    • Parameters
      • structref: the WasmGC struct
      • i32: field index
      • i64: field value

  • struct_set_indirect_f32

    • Description
      • Set f32 field of WasmGC struct
    • Parameters
      • structref: the WasmGC struct
      • i32: field index
      • f32: field value

  • struct_set_indirect_f64

    • Description
      • Set f64 field of WasmGC struct
    • Parameters
      • structref: the WasmGC struct
      • i32: field index
      • f64: field value

  • struct_set_indirect_anyref

    • Description
      • Set anyref field of WasmGC struct
    • Parameters
      • structref: the WasmGC struct
      • i32: field index
      • anyref: field value

  • struct_set_indirect_funcref

    • Description
      • Set funcref field of WasmGC struct
    • Parameters
      • structref: the WasmGC struct
      • i32: field index
      • funcref: field value