@glimmer/util/dist/commonjs/es2017/lib/immediate.js

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.isHandle = isHandle;
exports.isNonPrimitiveHandle = isNonPrimitiveHandle;
exports.constants = constants;
exports.isSmallInt = isSmallInt;
exports.encodeNegative = encodeNegative;
exports.decodeNegative = decodeNegative;
exports.encodePositive = encodePositive;
exports.decodePositive = decodePositive;
exports.encodeHandle = encodeHandle;
exports.decodeHandle = decodeHandle;
exports.encodeImmediate = encodeImmediate;
exports.decodeImmediate = decodeImmediate;

var _assert = require("./assert");

function isHandle(value) {
  return value >= 0;
}

function isNonPrimitiveHandle(value) {
  return value > 3
  /* ENCODED_UNDEFINED_HANDLE */
  ;
}

function constants(...values) {
  return [false, true, null, undefined, ...values];
}

function isSmallInt(value) {
  return value % 1 === 0 && value <= 536870911
  /* MAX_INT */
  && value >= -536870912
  /* MIN_INT */
  ;
}

function encodeNegative(num) {
  if (false
  /* LOCAL_DEBUG */
  ) {
      (0, _assert.debugAssert)(num % 1 === 0 && num >= -536870912
      /* MIN_INT */
      && num < 0, `Could not encode negative: ${num}`);
    }

  return num & -536870913
  /* SIGN_BIT */
  ;
}

function decodeNegative(num) {
  if (false
  /* LOCAL_DEBUG */
  ) {
      (0, _assert.debugAssert)(num % 1 === 0 && num < ~536870911
      /* MAX_INT */
      && num >= -1073741824
      /* MIN_SMI */
      , `Could not decode negative: ${num}`);
    }

  return num | ~-536870913
  /* SIGN_BIT */
  ;
}

function encodePositive(num) {
  if (false
  /* LOCAL_DEBUG */
  ) {
      (0, _assert.debugAssert)(num % 1 === 0 && num >= 0 && num <= 536870911
      /* MAX_INT */
      , `Could not encode positive: ${num}`);
    }

  return ~num;
}

function decodePositive(num) {
  if (false
  /* LOCAL_DEBUG */
  ) {
      (0, _assert.debugAssert)(num % 1 === 0 && num <= 0 && num >= ~536870911
      /* MAX_INT */
      , `Could not decode positive: ${num}`);
    }

  return ~num;
}

function encodeHandle(num) {
  if (false
  /* LOCAL_DEBUG */
  ) {
      (0, _assert.debugAssert)(num % 1 === 0 && num >= 0 && num <= 1073741823
      /* MAX_SMI */
      , `Could not encode handle: ${num}`);
    }

  return num;
}

function decodeHandle(num) {
  if (false
  /* LOCAL_DEBUG */
  ) {
      (0, _assert.debugAssert)(num % 1 === 0 && num <= 1073741823
      /* MAX_SMI */
      && num >= 0, `Could not decode handle: ${num}`);
    }

  return num;
}

function encodeImmediate(num) {
  num |= 0;
  return num < 0 ? encodeNegative(num) : encodePositive(num);
}

function decodeImmediate(num) {
  num |= 0;
  return num > -536870913
  /* SIGN_BIT */
  ? decodePositive(num) : decodeNegative(num);
} // Warm


[1, 2, 3].forEach(x => decodeHandle(encodeHandle(x)));
[1, -1].forEach(x => decodeImmediate(encodeImmediate(x)));
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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":""}