v8/test/mjsunit/wasm/reference-tables.js

// Copyright 2020 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// Flags: --experimental-wasm-typed-funcref

load('test/mjsunit/wasm/wasm-module-builder.js');

(function TestTables() {
  var exporting_instance = (function() {
    var builder = new WasmModuleBuilder();
    var binary_type = builder.addType(kSig_i_ii);

    builder.addFunction('addition', kSig_i_ii)
        .addBody([kExprLocalGet, 0, kExprLocalGet, 1, kExprI32Add])
        .exportFunc();

    builder.addFunction('succ', kSig_i_i)
        .addBody([kExprLocalGet, 0, kExprI32Const, 1, kExprI32Add])
        .exportFunc();

    builder.addTable(wasmOptRefType(binary_type), 1, 100).exportAs('table');

    return builder.instantiate({});
  })();

  // Wrong type for imported table.
  assertThrows(() => {
    var builder = new WasmModuleBuilder();
    var unary_type = builder.addType(kSig_i_i);
    builder.addImportedTable(
        'imports', 'table', 1, 100, wasmOptRefType(unary_type));
    builder.instantiate({imports: {table: exporting_instance.exports.table}})
  }, WebAssembly.LinkError, /imported table does not match the expected type/)

  // Type for imported table must match exactly.
  assertThrows(() => {
    var builder = new WasmModuleBuilder();
    builder.addImportedTable('imports', 'table', 1, 100, kWasmFuncRef);
    builder.instantiate({imports: {table: exporting_instance.exports.table}})
  }, WebAssembly.LinkError, /imported table does not match the expected type/)

  var instance = (function() {
    var builder = new WasmModuleBuilder();

    var unary_type = builder.addType(kSig_i_i);
    var binary_type = builder.addType(kSig_i_ii);

    builder.addImportedTable(
        'imports', 'table', 1, 100, wasmOptRefType(binary_type));

    var table =
        builder.addTable(wasmOptRefType(unary_type), 10).exportAs('table');
    builder.addTable(kWasmFuncRef, 1).exportAs('generic_table');

    builder
        .addFunction(
            'table_test', makeSig([wasmRefType(unary_type)], [kWasmI32]))
        // Set table[0] to input function, then retrieve it and call it.
        .addBody([
          kExprI32Const, 0, kExprLocalGet, 0, kExprTableSet, table.index,
          kExprI32Const, 42, kExprI32Const, 0, kExprTableGet, table.index,
          kExprCallRef
        ])
        .exportFunc();

    // Same, but with table[1] and call_indirect
    builder
        .addFunction(
            'table_indirect_test',
            makeSig([wasmRefType(unary_type)], [kWasmI32]))
        .addBody([
          kExprI32Const, 1, kExprLocalGet, 0, kExprTableSet, table.index,
          kExprI32Const, 42, kExprI32Const, 0, kExprCallIndirect, unary_type,
          table.index
        ])
        .exportFunc();

    // Instantiate with a table of the correct type.
    return builder.instantiate(
        {imports: {table: exporting_instance.exports.table}});
  })();

  // This module is valid.
  assertTrue(!!instance);

  // The correct function reference is preserved when setting it to and getting
  // it back from a table.
  assertEquals(
      43, instance.exports.table_test(exporting_instance.exports.succ));
  // Same for call indirect (the indirect call tables are also set correctly).
  assertEquals(
      43,
      instance.exports.table_indirect_test(exporting_instance.exports.succ));

  // Setting from JS API respects types.
  instance.exports.generic_table.set(0, exporting_instance.exports.succ);
  instance.exports.table.set(0, exporting_instance.exports.succ);
  assertThrows(
      () => instance.exports.table.set(0, exporting_instance.exports.addition),
      TypeError,
      /Argument 1 must be null or a WebAssembly function of type compatible to/);
})();

(function TestNonNullableTables() {
  var builder = new WasmModuleBuilder();

  var binary_type = builder.addType(kSig_i_ii);

  var addition = builder.addFunction('addition', kSig_i_ii).addBody([
    kExprLocalGet, 0, kExprLocalGet, 1, kExprI32Add
  ]);
  var subtraction =
      builder.addFunction('subtraction', kSig_i_ii)
          .addBody([kExprLocalGet, 0, kExprLocalGet, 1, kExprI32Sub])
          .exportFunc();

  var table = builder.addTable(wasmRefType(binary_type), 3, 3,
                               WasmInitExpr.RefFunc(addition.index));

  builder.addFunction('init', kSig_v_v)
      .addBody([
        kExprI32Const, 1, kExprRefFunc, subtraction.index, kExprTableSet,
        table.index
      ])
      .exportFunc();

  // (index, arg1, arg2) -> table[index](arg1, arg2)
  builder.addFunction('table_test', kSig_i_iii)
      .addBody([
        kExprLocalGet, 1, kExprLocalGet, 2, kExprLocalGet, 0, kExprCallIndirect,
        binary_type, table.index
      ])
      .exportFunc();

  var instance = builder.instantiate({});

  assertTrue(!!instance);

  instance.exports.init();
  assertEquals(44, instance.exports.table_test(0, 33, 11));
  assertEquals(22, instance.exports.table_test(1, 33, 11));
})();