| // Copyright (C) 2017 Josh Wolfe. All rights reserved. |
| // This code is governed by the BSD license found in the LICENSE file. |
| |
| /*--- |
| description: Prefix decrement for references to BigInt values |
| esid: sec-prefix-decrement-operator-runtime-semantics-evaluation |
| info: | |
| 1. Let expr be the result of evaluating UnaryExpression. |
| 2. Let oldValue be ? ToNumeric(? GetValue(expr)). |
| 3. Let newValue be ? Type(oldvalue)::subtract(oldValue, Type(oldValue)::unit). |
| 4. Perform ? PutValue(expr, newValue). |
| 5. Return newValue. |
| features: [BigInt] |
| ---*/ |
| |
| var x = 1n; |
| assert.sameValue(--x, 0n, "var x = 1n; --x === 0n"); |
| assert.sameValue(x, 0n, "var x = 1n; --x; x === 0n"); |
| |
| var x = 0n; |
| assert.sameValue(--x, -1n, "var x = 0n; --x === -1n"); |
| assert.sameValue(x, -1n, "var x = 0n; --x; x === -1n"); |
| |
| var x = 123457n; |
| assert.sameValue(--x, 123456n, "var x = 123457n; --x === 123456n"); |
| assert.sameValue(x, 123456n, "var x = 123457n; --x; x === 123456n"); |
| |
| var x = -123456n; |
| assert.sameValue(--x, -123457n, "var x = -123456n; --x === -123457n"); |
| assert.sameValue(x, -123457n, "var x = -123456n; --x; x === -123457n"); |
| |
| var x = 0x1fffffffffffff01n; |
| assert.sameValue(--x, 0x1fffffffffffff00n, "var x = 0x1fffffffffffff01n; --x === 0x1fffffffffffff00n"); |
| assert.sameValue(x, 0x1fffffffffffff00n, "var x = 0x1fffffffffffff01n; --x; x === 0x1fffffffffffff00n"); |
| |
| var x = -0x1fffffffffffff00n; |
| assert.sameValue(--x, -0x1fffffffffffff01n, "var x = -0x1fffffffffffff00n; --x === -0x1fffffffffffff01n"); |
| assert.sameValue(x, -0x1fffffffffffff01n, "var x = -0x1fffffffffffff00n; --x; x === -0x1fffffffffffff01n"); |
| |
| var x = {y:1n}; |
| assert.sameValue(--x.y, 0n, "var x = {y:1n}; --x.y === 0n"); |
| assert.sameValue(x.y, 0n, "var x = {y:1n}; --x.y; x.y === 0n"); |
| |
| var x = {y:{z:1n}}; |
| assert.sameValue(--x.y.z, 0n, "var x = {y:{z:1n}}; --x.y.z === 0n"); |
| assert.sameValue(x.y.z, 0n, "var x = {y:{z:1n}}; --x.y.z; x.y.z === 0n"); |
| |
| var x = [1n]; |
| assert.sameValue(--x[0], 0n, "var x = [1n]; --x[0] === 0n"); |
| assert.sameValue(x[0], 0n, "var x = [1n]; --x[0]; x[0] === 0n"); |
| |
| var x = [null, [null, null, 1n]]; |
| assert.sameValue(--x[1][2], 0n, "var x = [null, [null, null, 1n]]; --x[1][2] === 0n"); |
| assert.sameValue(x[1][2], 0n, "var x = [null, [null, null, 1n]]; --x[1][2]; x[1][2] === 0n"); |
| |
| var x = {y:[1n]}; |
| assert.sameValue(--x.y[0], 0n, "var x = {y:[1n]}; --x.y[0] === 0n"); |
| assert.sameValue(x.y[0], 0n, "var x = {y:[1n]}; --x.y[0]; x.y[0] === 0n"); |
| |
| var x = [{z:1n}]; |
| assert.sameValue(--x[0].z, 0n, "var x = [{z:1n}]; --x[0].z === 0n"); |
| assert.sameValue(x[0].z, 0n, "var x = [{z:1n}]; --x[0].z; x[0].z === 0n"); |