v8/test/mjsunit/compiler/fast-api-calls-wasm.js

// Copyright 2022 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: --turbo-fast-api-calls --expose-fast-api

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

assertThrows(() => d8.test.FastCAPI());
const fast_c_api = new d8.test.FastCAPI();

function buildWasm(name, sig, body) {
  const builder = new WasmModuleBuilder();
  const add_all_no_options = builder.addImport(
    'fast_c_api',
    'add_all_no_options',
    makeSig(
      [kWasmI32, kWasmI32, kWasmI32, kWasmI64, kWasmI64, kWasmF32, kWasmF64],
      [kWasmF64],
    ),
  );
  const add_all_no_options_mismatch = builder.addImport(
    'fast_c_api',
    'add_all_no_options',
    makeSig(
      [kWasmI32, kWasmI32, kWasmI32, kWasmI64, kWasmF32, kWasmI64, kWasmF64],
      [kWasmF64],
    ),
  );
  const add_all_nested_bound = builder.addImport(
    'fast_c_api',
    'add_all_nested_bound',
    makeSig(
      [kWasmI32, kWasmI32, kWasmI32, kWasmI64, kWasmI64, kWasmF32, kWasmF64],
      [kWasmF64],
    ),
  );
  builder
    .addFunction(name, sig)
    .addBody(body({
      add_all_no_options,
      add_all_no_options_mismatch,
      add_all_nested_bound,
    }))
    .exportFunc();
  const x = {};
  const module = builder.instantiate({
    fast_c_api: {
      add_all_no_options: fast_c_api.add_all_no_options.bind(fast_c_api),
      add_all_no_options_mismatch: fast_c_api.add_all_no_options.bind(fast_c_api),
      add_all_nested_bound: fast_c_api.add_all_no_options
        .bind(fast_c_api)
        .bind(x),
    },
  });
  return module.exports[name];
}

// ----------- add_all -----------
// `add_all` has the following signature:
// double add_all(bool /*should_fallback*/, int32_t, uint32_t,
//   int64_t, uint64_t, float, double)

const max_safe_float = 2**24 - 1;
const add_all_result = -42 + 45 + Number.MIN_SAFE_INTEGER + Number.MAX_SAFE_INTEGER +
  max_safe_float * 0.5 + Math.PI;

const add_all_wasm = buildWasm(
  'add_all_wasm', makeSig([], [kWasmF64]),
  ({ add_all_no_options }) => [
    ...wasmI32Const(0),
    ...wasmI32Const(-42),
    ...wasmI32Const(45),
    kExprI64Const, 0x81, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x70, // Number.MIN_SAFE_INTEGER
    kExprI64Const, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x0F, // Number.MAX_SAFE_INTEGER
    ...wasmF32Const(max_safe_float * 0.5),
    ...wasmF64Const(Math.PI),
    kExprCallFunction, add_all_no_options,
    kExprReturn,
  ],
);

if (fast_c_api.supports_fp_params) {
  // Test wasm hits fast path.
  fast_c_api.reset_counts();
  assertEquals(add_all_result, add_all_wasm());
  assertEquals(1, fast_c_api.fast_call_count());
  assertEquals(0, fast_c_api.slow_call_count());
} else {
  // Test wasm hits slow path.
  fast_c_api.reset_counts();
  assertEquals(add_all_result, add_all_wasm());
  assertEquals(0, fast_c_api.fast_call_count());
  assertEquals(1, fast_c_api.slow_call_count());
}

// ----------- Test add_all signature mismatch -----------

const add_all_mismatch_wasm = buildWasm(
  'add_all_mismatch_wasm', makeSig([], [kWasmF64]),
  ({ add_all_no_options_mismatch }) => [
    ...wasmI32Const(0),
    ...wasmI32Const(45),
    ...wasmI32Const(-42),
    kExprI64Const, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x0F, // Number.MAX_SAFE_INTEGER
    ...wasmF32Const(max_safe_float * 0.5),
    kExprI64Const, 0x81, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x70, // Number.MIN_SAFE_INTEGER
    ...wasmF64Const(Math.PI),
    kExprCallFunction, add_all_no_options_mismatch,
    kExprReturn,
  ],
);

// Test that wasm takes slow path.
fast_c_api.reset_counts();
add_all_mismatch_wasm();
assertEquals(0, fast_c_api.fast_call_count());
assertEquals(1, fast_c_api.slow_call_count());

// ----------- Test add_all nested bound function -----------

const add_all_nested_bound_wasm = buildWasm(
  'add_all_nested_bound_wasm', makeSig([], [kWasmF64]),
  ({ add_all_nested_bound }) => [
    ...wasmI32Const(0),
    ...wasmI32Const(-42),
    ...wasmI32Const(45),
    kExprI64Const, 0x81, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x70, // Number.MIN_SAFE_INTEGER
    kExprI64Const, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x0F, // Number.MAX_SAFE_INTEGER
    ...wasmF32Const(max_safe_float * 0.5),
    ...wasmF64Const(Math.PI),
    kExprCallFunction, add_all_nested_bound,
    kExprReturn,
  ],
);

// Test wasm hits slow path.
fast_c_api.reset_counts();
assertEquals(add_all_result, add_all_nested_bound_wasm());
assertEquals(0, fast_c_api.fast_call_count());
assertEquals(1, fast_c_api.slow_call_count());