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n-api: add more int64_t tests
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* Updated tests for `Number` and `int32_t`
* Added new tests for `int64_t`
* Updated N-API `int64_t` behavior to return zero for all non-finite
  numbers
* Clarified the documentation for these calls.

Backport-PR-URL: #19265
PR-URL: #19402
Refs: nodejs/node-chakracore#500
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
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@kfarnung @MylesBorins
kfarnung authored and MylesBorins committed May 1, 2018
1 parent 8b3ef46 commit 07a6770
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Showing 3 changed files with 125 additions and 48 deletions.
27 changes: 20 additions & 7 deletions doc/api/n-api.md
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Original file line number Diff line number Diff line change
Expand Up @@ -1808,13 +1808,17 @@ napi_status napi_get_value_int32(napi_env env,
- `[out] result`: C int32 primitive equivalent of the given JavaScript Number.

Returns `napi_ok` if the API succeeded. If a non-number `napi_value`
is passed in `napi_number_expected .
is passed in `napi_number_expected`.

This API returns the C int32 primitive equivalent
of the given JavaScript Number. If the number exceeds the range of the
32 bit integer, then the result is truncated to the equivalent of the
bottom 32 bits. This can result in a large positive number becoming
a negative number if the value is > 2^31 -1.
of the given JavaScript Number.

If the number exceeds the range of the 32 bit integer, then the result is
truncated to the equivalent of the bottom 32 bits. This can result in a large
positive number becoming a negative number if the value is > 2^31 -1.

Non-finite number values (NaN, positive infinity, or negative infinity) set the
result to zero.

#### napi_get_value_int64
<!-- YAML
Expand All @@ -1833,8 +1837,17 @@ napi_status napi_get_value_int64(napi_env env,
Returns `napi_ok` if the API succeeded. If a non-number `napi_value`
is passed in it returns `napi_number_expected`.

This API returns the C int64 primitive equivalent of the given
JavaScript Number.
This API returns the C int64 primitive equivalent of the given JavaScript
Number.

Number values outside the range of
[`Number.MIN_SAFE_INTEGER`](https://tc39.github.io/ecma262/#sec-number.min_safe_integer)
-(2^53 - 1) -
[`Number.MAX_SAFE_INTEGER`](https://tc39.github.io/ecma262/#sec-number.max_safe_integer)
(2^53 - 1) will lose precision.

Non-finite number values (NaN, positive infinity, or negative infinity) set the
result to zero.

#### napi_get_value_string_latin1
<!-- YAML
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11 changes: 6 additions & 5 deletions src/node_api.cc
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Expand Up @@ -2197,15 +2197,16 @@ napi_status napi_get_value_int64(napi_env env,

RETURN_STATUS_IF_FALSE(env, val->IsNumber(), napi_number_expected);

// v8::Value::IntegerValue() converts NaN to INT64_MIN, inconsistent with
// v8::Value::Int32Value() that converts NaN to 0. So special-case NaN here.
// v8::Value::IntegerValue() converts NaN, +Inf, and -Inf to INT64_MIN,
// inconsistent with v8::Value::Int32Value() which converts those values to 0.
// Special-case all non-finite values to match that behavior.
double doubleValue = val.As<v8::Number>()->Value();
if (std::isnan(doubleValue)) {
*result = 0;
} else {
if (std::isfinite(doubleValue)) {
// Empty context: https://github.com/nodejs/node/issues/14379
v8::Local<v8::Context> context;
*result = val->IntegerValue(context).FromJust();
} else {
*result = 0;
}

return napi_clear_last_error(env);
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135 changes: 99 additions & 36 deletions test/addons-napi/test_number/test.js
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Expand Up @@ -5,50 +5,113 @@ const test_number = require(`./build/${common.buildType}/test_number`);


// testing api calls for number
assert.strictEqual(0, test_number.Test(0));
assert.strictEqual(1, test_number.Test(1));
assert.strictEqual(-1, test_number.Test(-1));
assert.strictEqual(100, test_number.Test(100));
assert.strictEqual(2121, test_number.Test(2121));
assert.strictEqual(-1233, test_number.Test(-1233));
assert.strictEqual(986583, test_number.Test(986583));
assert.strictEqual(-976675, test_number.Test(-976675));
function testNumber(num) {
assert.strictEqual(num, test_number.Test(num));
}

const num1 = 98765432213456789876546896323445679887645323232436587988766545658;
assert.strictEqual(num1, test_number.Test(num1));
testNumber(0);
testNumber(-0);
testNumber(1);
testNumber(-1);
testNumber(100);
testNumber(2121);
testNumber(-1233);
testNumber(986583);
testNumber(-976675);

const num2 = -4350987086545760976737453646576078997096876957864353245245769809;
assert.strictEqual(num2, test_number.Test(num2));
testNumber(
98765432213456789876546896323445679887645323232436587988766545658);
testNumber(
-4350987086545760976737453646576078997096876957864353245245769809);
testNumber(Number.MIN_SAFE_INTEGER);
testNumber(Number.MAX_SAFE_INTEGER);
testNumber(Number.MAX_SAFE_INTEGER + 10);

const num3 = Number.MAX_SAFE_INTEGER;
assert.strictEqual(num3, test_number.Test(num3));
testNumber(Number.MIN_VALUE);
testNumber(Number.MAX_VALUE);
testNumber(Number.MAX_VALUE + 10);

const num4 = Number.MAX_SAFE_INTEGER + 10;
assert.strictEqual(num4, test_number.Test(num4));
testNumber(Number.POSITIVE_INFINITY);
testNumber(Number.NEGATIVE_INFINITY);
assert(Object.is(NaN, test_number.Test(NaN)));

const num5 = Number.MAX_VALUE;
assert.strictEqual(num5, test_number.Test(num5));
// validate documented behavior when value is retrieved as 32-bit integer with
// `napi_get_value_int32`
function testInt32(input, expected = input) {
assert.strictEqual(expected, test_number.TestInt32Truncation(input));
}

const num6 = Number.MAX_VALUE + 10;
assert.strictEqual(num6, test_number.Test(num6));
// Test zero
testInt32(0.0, 0);
testInt32(-0.0, 0);

const num7 = Number.POSITIVE_INFINITY;
assert.strictEqual(num7, test_number.Test(num7));
// Test min/max int32 range
testInt32(-Math.pow(2, 31));
testInt32(Math.pow(2, 31) - 1);

const num8 = Number.NEGATIVE_INFINITY;
assert.strictEqual(num8, test_number.Test(num8));
// Test overflow scenarios
testInt32(4294967297, 1);
testInt32(4294967296, 0);
testInt32(4294967295, -1);
testInt32(4294967296 * 5 + 3, 3);

// Test min/max safe integer range
testInt32(Number.MIN_SAFE_INTEGER, 1);
testInt32(Number.MAX_SAFE_INTEGER, -1);

// validate documented behaviour when value is retrieved
// as 32 bit integer with napi_get_value_int32
assert.strictEqual(1, test_number.TestInt32Truncation(4294967297));
assert.strictEqual(0, test_number.TestInt32Truncation(4294967296));
assert.strictEqual(-1, test_number.TestInt32Truncation(4294967295));
assert.strictEqual(3, test_number.TestInt32Truncation(4294967296 * 5 + 3));
// Test within int64_t range (with precision loss)
testInt32(-Math.pow(2, 63) + (Math.pow(2, 9) + 1), 1024);
testInt32(Math.pow(2, 63) - (Math.pow(2, 9) + 1), -1024);

// validate that the boundaries of safe integer can be passed through
// successfully
assert.strictEqual(Number.MAX_SAFE_INTEGER,
test_number.TestInt64Truncation(Number.MAX_SAFE_INTEGER));
assert.strictEqual(Number.MIN_SAFE_INTEGER,
test_number.TestInt64Truncation(Number.MIN_SAFE_INTEGER));
// Test min/max double value
testInt32(-Number.MIN_VALUE, 0);
testInt32(Number.MIN_VALUE, 0);
testInt32(-Number.MAX_VALUE, 0);
testInt32(Number.MAX_VALUE, 0);

// Test outside int64_t range
testInt32(-Math.pow(2, 63) + (Math.pow(2, 9)), 0);
testInt32(Math.pow(2, 63) - (Math.pow(2, 9)), 0);

// Test non-finite numbers
testInt32(Number.POSITIVE_INFINITY, 0);
testInt32(Number.NEGATIVE_INFINITY, 0);
testInt32(Number.NaN, 0);

// validate documented behavior when value is retrieved as 64-bit integer with
// `napi_get_value_int64`
function testInt64(input, expected = input) {
assert.strictEqual(expected, test_number.TestInt64Truncation(input));
}

// Both V8 and ChakraCore return a sentinel value of `0x8000000000000000` when
// the conversion goes out of range, but V8 treats it as unsigned in some cases.
const RANGEERROR_POSITIVE = Math.pow(2, 63);
const RANGEERROR_NEGATIVE = -Math.pow(2, 63);

// Test zero
testInt64(0.0, 0);
testInt64(-0.0, 0);

// Test min/max safe integer range
testInt64(Number.MIN_SAFE_INTEGER);
testInt64(Number.MAX_SAFE_INTEGER);

// Test within int64_t range (with precision loss)
testInt64(-Math.pow(2, 63) + (Math.pow(2, 9) + 1));
testInt64(Math.pow(2, 63) - (Math.pow(2, 9) + 1));

// Test min/max double value
testInt64(-Number.MIN_VALUE, 0);
testInt64(Number.MIN_VALUE, 0);
testInt64(-Number.MAX_VALUE, RANGEERROR_NEGATIVE);
testInt64(Number.MAX_VALUE, RANGEERROR_POSITIVE);

// Test outside int64_t range
testInt64(-Math.pow(2, 63) + (Math.pow(2, 9)), RANGEERROR_NEGATIVE);
testInt64(Math.pow(2, 63) - (Math.pow(2, 9)), RANGEERROR_POSITIVE);

// Test non-finite numbers
testInt64(Number.POSITIVE_INFINITY, 0);
testInt64(Number.NEGATIVE_INFINITY, 0);
testInt64(Number.NaN, 0);

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