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11.4 kBJavaScriptView Raw
1import { debugAssert as assert } from './assert';
2export function isHandle(value) {
3 return value >= 0;
4}
5export function isNonPrimitiveHandle(value) {
6 return value > 3
7 /* ENCODED_UNDEFINED_HANDLE */
8 ;
9}
10export function constants() {
11 for (var _len = arguments.length, values = new Array(_len), _key = 0; _key < _len; _key++) {
12 values[_key] = arguments[_key];
13 }
14
15 return [false, true, null, undefined].concat(values);
16}
17export function isSmallInt(value) {
18 return value % 1 === 0 && value <= 536870911
19 /* MAX_INT */
20 && value >= -536870912
21 /* MIN_INT */
22 ;
23}
24export function encodeNegative(num) {
25 if (false
26 /* LOCAL_DEBUG */
27 ) {
28 assert(num % 1 === 0 && num >= -536870912
29 /* MIN_INT */
30 && num < 0, "Could not encode negative: " + num);
31 }
32
33 return num & -536870913
34 /* SIGN_BIT */
35 ;
36}
37export function decodeNegative(num) {
38 if (false
39 /* LOCAL_DEBUG */
40 ) {
41 assert(num % 1 === 0 && num < ~536870911
42 /* MAX_INT */
43 && num >= -1073741824
44 /* MIN_SMI */
45 , "Could not decode negative: " + num);
46 }
47
48 return num | ~-536870913
49 /* SIGN_BIT */
50 ;
51}
52export function encodePositive(num) {
53 if (false
54 /* LOCAL_DEBUG */
55 ) {
56 assert(num % 1 === 0 && num >= 0 && num <= 536870911
57 /* MAX_INT */
58 , "Could not encode positive: " + num);
59 }
60
61 return ~num;
62}
63export function decodePositive(num) {
64 if (false
65 /* LOCAL_DEBUG */
66 ) {
67 assert(num % 1 === 0 && num <= 0 && num >= ~536870911
68 /* MAX_INT */
69 , "Could not decode positive: " + num);
70 }
71
72 return ~num;
73}
74export function encodeHandle(num) {
75 if (false
76 /* LOCAL_DEBUG */
77 ) {
78 assert(num % 1 === 0 && num >= 0 && num <= 1073741823
79 /* MAX_SMI */
80 , "Could not encode handle: " + num);
81 }
82
83 return num;
84}
85export function decodeHandle(num) {
86 if (false
87 /* LOCAL_DEBUG */
88 ) {
89 assert(num % 1 === 0 && num <= 1073741823
90 /* MAX_SMI */
91 && num >= 0, "Could not decode handle: " + num);
92 }
93
94 return num;
95}
96export function encodeImmediate(num) {
97 num |= 0;
98 return num < 0 ? encodeNegative(num) : encodePositive(num);
99}
100export function decodeImmediate(num) {
101 num |= 0;
102 return num > -536870913
103 /* SIGN_BIT */
104 ? decodePositive(num) : decodeNegative(num);
105} // Warm
106
107[1, 2, 3].forEach(function (x) {
108 return decodeHandle(encodeHandle(x));
109});
110[1, -1].forEach(function (x) {
111 return decodeImmediate(encodeImmediate(x));
112});
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Positives are\n  higher numbers (-1, -2, -3, etc), negatives are lower.\n\n  We only encode immediates for two reasons:\n\n  1. To transfer over the wire, so they're smaller in general\n  2. When pushing values onto the stack from the low level/inner VM, which may\n     be converted into WASM one day.\n\n  This allows the low-level VM to always use SMIs, and to minimize using JS\n  values via handles for things like the stack pointer and frame pointer.\n  Externally, most code pushes values as JS values, except when being pulled\n  from the append byte code where it was already encoded.\n\n  Logically, this is because the low level VM doesn't really care about these\n  higher level values. For instance, the result of a userland helper may be a\n  number, or a boolean, or undefined/null, but it's extra work to figure that\n  out and push it correctly, vs. just pushing the value as a JS value with a\n  handle.\n\n  Note: The details could change here in the future, this is just the current\n  strategy.\n*/\n\nexport const enum ImmediateConstants {\n  MAX_SMI = 2 ** 30 - 1,\n  MIN_SMI = ~MAX_SMI,\n  SIGN_BIT = ~(2 ** 29),\n  MAX_INT = ~SIGN_BIT - 1,\n  MIN_INT = ~MAX_INT,\n\n  FALSE_HANDLE = 0,\n  TRUE_HANDLE = 1,\n  NULL_HANDLE = 2,\n  UNDEFINED_HANDLE = 3,\n\n  ENCODED_FALSE_HANDLE = FALSE_HANDLE,\n  ENCODED_TRUE_HANDLE = TRUE_HANDLE,\n  ENCODED_NULL_HANDLE = NULL_HANDLE,\n  ENCODED_UNDEFINED_HANDLE = UNDEFINED_HANDLE,\n}\n\nexport function isHandle(value: number) {\n  return value >= 0;\n}\n\nexport function isNonPrimitiveHandle(value: number) {\n  return value > ImmediateConstants.ENCODED_UNDEFINED_HANDLE;\n}\n\nexport function constants(...values: unknown[]): unknown[] {\n  return [false, true, null, undefined, ...values];\n}\n\nexport function isSmallInt(value: number) {\n  return (\n    value % 1 === 0 && value <= ImmediateConstants.MAX_INT && value >= ImmediateConstants.MIN_INT\n  );\n}\n\nexport function encodeNegative(num: number) {\n  if (LOCAL_DEBUG) {\n    assert(\n      num % 1 === 0 && num >= ImmediateConstants.MIN_INT && num < 0,\n      `Could not encode negative: ${num}`\n    );\n  }\n\n  return num & ImmediateConstants.SIGN_BIT;\n}\n\nexport function decodeNegative(num: number) {\n  if (LOCAL_DEBUG) {\n    assert(\n      num % 1 === 0 && num < ~ImmediateConstants.MAX_INT && num >= ImmediateConstants.MIN_SMI,\n      `Could not decode negative: ${num}`\n    );\n  }\n\n  return num | ~ImmediateConstants.SIGN_BIT;\n}\n\nexport function encodePositive(num: number) {\n  if (LOCAL_DEBUG) {\n    assert(\n      num % 1 === 0 && num >= 0 && num <= ImmediateConstants.MAX_INT,\n      `Could not encode positive: ${num}`\n    );\n  }\n\n  return ~num;\n}\n\nexport function decodePositive(num: number) {\n  if (LOCAL_DEBUG) {\n    assert(\n      num % 1 === 0 && num <= 0 && num >= ~ImmediateConstants.MAX_INT,\n      `Could not decode positive: ${num}`\n    );\n  }\n\n  return ~num;\n}\n\nexport function encodeHandle(num: number) {\n  if (LOCAL_DEBUG) {\n    assert(\n      num % 1 === 0 && num >= 0 && num <= ImmediateConstants.MAX_SMI,\n      `Could not encode handle: ${num}`\n    );\n  }\n\n  return num;\n}\n\nexport function decodeHandle(num: number) {\n  if (LOCAL_DEBUG) {\n    assert(\n      num % 1 === 0 && num <= ImmediateConstants.MAX_SMI && num >= 0,\n      `Could not decode handle: ${num}`\n    );\n  }\n\n  return num;\n}\n\nexport function encodeImmediate(num: number) {\n  num |= 0;\n  return num < 0 ? encodeNegative(num) : encodePositive(num);\n}\n\nexport function decodeImmediate(num: number) {\n  num |= 0;\n  return num > ImmediateConstants.SIGN_BIT ? decodePositive(num) : decodeNegative(num);\n}\n\n// Warm\n[1, 2, 3].forEach((x) => decodeHandle(encodeHandle(x)));\n[1, -1].forEach((x) => decodeImmediate(encodeImmediate(x)));\n"],"sourceRoot":""}
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