github.com/goplusjs/gopherjs@v1.2.6-0.20211206034512-f187917453b8/compiler/prelude/types.go

package prelude

const types = `
var $kindBool = 1;
var $kindInt = 2;
var $kindInt8 = 3;
var $kindInt16 = 4;
var $kindInt32 = 5;
var $kindInt64 = 6;
var $kindUint = 7;
var $kindUint8 = 8;
var $kindUint16 = 9;
var $kindUint32 = 10;
var $kindUint64 = 11;
var $kindUintptr = 12;
var $kindFloat32 = 13;
var $kindFloat64 = 14;
var $kindComplex64 = 15;
var $kindComplex128 = 16;
var $kindArray = 17;
var $kindChan = 18;
var $kindFunc = 19;
var $kindInterface = 20;
var $kindMap = 21;
var $kindPtr = 22;
var $kindSlice = 23;
var $kindString = 24;
var $kindStruct = 25;
var $kindUnsafePointer = 26;

var $methodSynthesizers = [];
var $addMethodSynthesizer = function(f) {
  if ($methodSynthesizers === null) {
    f();
    return;
  }
  $methodSynthesizers.push(f);
};
var $synthesizeMethods = function() {
  $methodSynthesizers.forEach(function(f) { f(); });
  $methodSynthesizers = null;
};

var $ifaceKeyFor = function(x) {
  if (x === $ifaceNil) {
    return 'nil';
  }
  var c = x.constructor;
  return c.string + '$' + c.keyFor(x.$val);
};

var $identity = function(x) { return x; };

var $typeIDCounter = 0;

var $idKey = function(x) {
  if (x.$id === undefined) {
    $idCounter++;
    x.$id = $idCounter;
  }
  return String(x.$id);
};

var $newType = function(size, kind, string, named, pkg, exported, constructor) {
  var typ;
  switch(kind) {
  case $kindBool:
  case $kindInt:
  case $kindInt8:
  case $kindInt16:
  case $kindInt32:
  case $kindUint:
  case $kindUint8:
  case $kindUint16:
  case $kindUint32:
  case $kindUintptr:
  case $kindUnsafePointer:
    typ = function(v) { this.$val = v; };
    typ.wrapped = true;
    typ.keyFor = $identity;
    break;

  case $kindString:
    typ = function(v) { this.$val = v; };
    typ.wrapped = true;
    typ.keyFor = function(x) { return "$" + x; };
    break;

  case $kindFloat32:
  case $kindFloat64:
    typ = function(v) { this.$val = v; };
    typ.wrapped = true;
    typ.keyFor = function(x) { return $floatKey(x); };
    break;

  case $kindInt64:
    typ = function(high, low) {
      this.$high = (high + Math.floor(Math.ceil(low) / 4294967296)) >> 0;
      this.$low = low >>> 0;
      this.$val = this;
    };
    typ.keyFor = function(x) { return x.$high + "$" + x.$low; };
    break;

  case $kindUint64:
    typ = function(high, low) {
      this.$high = (high + Math.floor(Math.ceil(low) / 4294967296)) >>> 0;
      this.$low = low >>> 0;
      this.$val = this;
    };
    typ.keyFor = function(x) { return x.$high + "$" + x.$low; };
    break;

  case $kindComplex64:
    typ = function(real, imag) {
      this.$real = $fround(real);
      this.$imag = $fround(imag);
      this.$val = this;
    };
    typ.keyFor = function(x) { return x.$real + "$" + x.$imag; };
    break;

  case $kindComplex128:
    typ = function(real, imag) {
      this.$real = real;
      this.$imag = imag;
      this.$val = this;
    };
    typ.keyFor = function(x) { return x.$real + "$" + x.$imag; };
    break;

  case $kindArray:
    typ = function(v) { this.$val = v; };
    typ.wrapped = true;
    typ.ptr = $newType(4, $kindPtr, "*" + string, false, "", false, function(array) {
      this.$get = function() { return array; };
      this.$set = function(v) { typ.copy(this, v); };
      this.$val = array;
    });
    typ.init = function(elem, len) {
      typ.elem = elem;
      typ.len = len;
      typ.comparable = elem.comparable;
      typ.keyFor = function(x) {
        return Array.prototype.join.call($mapArray(x, function(e) {
          return String(elem.keyFor(e)).replace(/\\/g, "\\\\").replace(/\$/g, "\\$");
        }), "$");
      };
      typ.copy = function(dst, src) {
        $copyArray(dst, src, 0, 0, src.length, elem);
      };
      typ.ptr.init(typ);
      Object.defineProperty(typ.ptr.nil, "nilCheck", { get: $throwNilPointerError });
    };
    break;

  case $kindChan:
    typ = function(v) { this.$val = v; };
    typ.wrapped = true;
    typ.keyFor = $idKey;
    typ.init = function(elem, sendOnly, recvOnly) {
      typ.elem = elem;
      typ.sendOnly = sendOnly;
      typ.recvOnly = recvOnly;
    };
    break;

  case $kindFunc:
    typ = function(v) { this.$val = v; };
    typ.wrapped = true;
    typ.init = function(params, results, variadic) {
      typ.params = params;
      typ.results = results;
      typ.variadic = variadic;
      typ.comparable = false;
    };
    break;

  case $kindInterface:
    typ = { implementedBy: {}, missingMethodFor: {} };
    typ.keyFor = $ifaceKeyFor;
    typ.init = function(methods) {
      typ.methods = methods;
      methods.forEach(function(m) {
        $ifaceNil[m.prop] = $throwNilPointerError;
      });
    };
    break;

  case $kindMap:
    typ = function(v) { this.$val = v; };
    typ.wrapped = true;
    typ.init = function(key, elem) {
      typ.key = key;
      typ.elem = elem;
      typ.comparable = false;
    };
    break;

  case $kindPtr:
    typ = constructor || function(getter, setter, target) {
      this.$get = getter;
      this.$set = setter;
      this.$target = target;
      this.$val = this;
    };
    typ.keyFor = $idKey;
    typ.init = function(elem) {
      typ.elem = elem;
      typ.wrapped = (elem.kind === $kindArray);
      typ.nil = new typ($throwNilPointerError, $throwNilPointerError);
    };
    break;

  case $kindSlice:
    typ = function(array) {
      if (array.constructor !== typ.nativeArray) {
        array = new typ.nativeArray(array);
      }
      this.$array = array;
      this.$offset = 0;
      this.$length = array.length;
      this.$capacity = array.length;
      this.$val = this;
    };
    typ.init = function(elem) {
      typ.elem = elem;
      typ.comparable = false;
      typ.nativeArray = $nativeArray(elem.kind);
      typ.nil = new typ([]);
    };
    break;

  case $kindStruct:
    typ = function(v) { this.$val = v; };
    typ.wrapped = true;
    typ.ptr = $newType(4, $kindPtr, "*" + string, false, pkg, exported, constructor);
    typ.ptr.elem = typ;
    typ.ptr.prototype.$get = function() { return this; };
    typ.ptr.prototype.$set = function(v) { typ.copy(this, v); };
    typ.init = function(pkgPath, fields) {
      typ.pkgPath = pkgPath;
      typ.fields = fields;
      fields.forEach(function(f) {
        if (!f.typ.comparable) {
          typ.comparable = false;
        }
      });
      typ.keyFor = function(x) {
        var val = x.$val;
        return $mapArray(fields, function(f) {
          return String(f.typ.keyFor(val[f.prop])).replace(/\\/g, "\\\\").replace(/\$/g, "\\$");
        }).join("$");
      };
      typ.copy = function(dst, src) {
        for (var i = 0; i < fields.length; i++) {
          var f = fields[i];
          switch (f.typ.kind) {
          case $kindArray:
          case $kindStruct:
            f.typ.copy(dst[f.prop], src[f.prop]);
            continue;
          default:
            dst[f.prop] = src[f.prop];
            continue;
          }
        }
      };
      /* nil value */
      var properties = {};
      fields.forEach(function(f) {
        properties[f.prop] = { get: $throwNilPointerError, set: $throwNilPointerError };
      });
      typ.ptr.nil = Object.create(constructor.prototype, properties);
      typ.ptr.nil.$val = typ.ptr.nil;
      /* methods for embedded fields */
      $addMethodSynthesizer(function() {
        var synthesizeMethod = function(target, m, f) {
          if (target.prototype[m.prop] !== undefined) { return; }
          target.prototype[m.prop] = function() {
            var v = this.$val[f.prop];
            if (f.typ === $jsObjectPtr) {
              v = new $jsObjectPtr(v);
            }
            if (v.$val === undefined) {
              v = new f.typ(v);
            }
            return v[m.prop].apply(v, arguments);
          };
        };
        fields.forEach(function(f) {
          if (f.embedded) {
            $methodSet(f.typ).forEach(function(m) {
              synthesizeMethod(typ, m, f);
              synthesizeMethod(typ.ptr, m, f);
            });
            $methodSet($ptrType(f.typ)).forEach(function(m) {
              synthesizeMethod(typ.ptr, m, f);
            });
          }
        });
      });
    };
    break;

  default:
    $panic(new $String("invalid kind: " + kind));
  }

  switch (kind) {
  case $kindBool:
  case $kindMap:
    typ.zero = function() { return false; };
    break;

  case $kindInt:
  case $kindInt8:
  case $kindInt16:
  case $kindInt32:
  case $kindUint:
  case $kindUint8 :
  case $kindUint16:
  case $kindUint32:
  case $kindUintptr:
  case $kindUnsafePointer:
  case $kindFloat32:
  case $kindFloat64:
    typ.zero = function() { return 0; };
    break;

  case $kindString:
    typ.zero = function() { return ""; };
    break;

  case $kindInt64:
  case $kindUint64:
  case $kindComplex64:
  case $kindComplex128:
    var zero = new typ(0, 0);
    typ.zero = function() { return zero; };
    break;

  case $kindPtr:
  case $kindSlice:
    typ.zero = function() { return typ.nil; };
    break;

  case $kindChan:
    typ.zero = function() { return $chanNil; };
    break;

  case $kindFunc:
    typ.zero = function() { return $throwNilPointerError; };
    break;

  case $kindInterface:
    typ.zero = function() { return $ifaceNil; };
    break;

  case $kindArray:
    typ.zero = function() {
      var arrayClass = $nativeArray(typ.elem.kind);
      if (arrayClass !== Array) {
        return new arrayClass(typ.len);
      }
      var array = new Array(typ.len);
      for (var i = 0; i < typ.len; i++) {
        array[i] = typ.elem.zero();
      }
      return array;
    };
    break;

  case $kindStruct:
    typ.zero = function() { return new typ.ptr(); };
    break;

  default:
    $panic(new $String("invalid kind: " + kind));
  }

  typ.id = $typeIDCounter;
  $typeIDCounter++;
  typ.size = size;
  typ.kind = kind;
  typ.string = string;
  typ.named = named;
  typ.pkg = pkg;
  typ.exported = exported;
  typ.methods = [];
  typ.methodSetCache = null;
  typ.comparable = true;
  return typ;
};

var $methodSet = function(typ) {
  if (typ.methodSetCache !== null) {
    return typ.methodSetCache;
  }
  var base = {};

  var isPtr = (typ.kind === $kindPtr);
  if (isPtr && typ.elem.kind === $kindInterface) {
    typ.methodSetCache = [];
    return [];
  }

  var current = [{typ: isPtr ? typ.elem : typ, indirect: isPtr}];

  var seen = {};

  while (current.length > 0) {
    var next = [];
    var mset = [];

    current.forEach(function(e) {
      if (seen[e.typ.string]) {
        return;
      }
      seen[e.typ.string] = true;

      if (e.typ.named) {
        mset = mset.concat(e.typ.methods);
        if (e.indirect) {
          mset = mset.concat($ptrType(e.typ).methods);
        }
      }

      switch (e.typ.kind) {
      case $kindStruct:
        e.typ.fields.forEach(function(f) {
          if (f.embedded) {
            var fTyp = f.typ;
            var fIsPtr = (fTyp.kind === $kindPtr);
            next.push({typ: fIsPtr ? fTyp.elem : fTyp, indirect: e.indirect || fIsPtr});
          }
        });
        break;

      case $kindInterface:
        mset = mset.concat(e.typ.methods);
        break;
      }
    });

    mset.forEach(function(m) {
      if (base[m.name] === undefined) {
        base[m.name] = m;
      }
    });

    current = next;
  }

  typ.methodSetCache = [];
  Object.keys(base).sort().forEach(function(name) {
    typ.methodSetCache.push(base[name]);
  });
  return typ.methodSetCache;
};

var $Bool          = $newType( 1, $kindBool,          "bool",           true, "", false, null);
var $Int           = $newType( 4, $kindInt,           "int",            true, "", false, null);
var $Int8          = $newType( 1, $kindInt8,          "int8",           true, "", false, null);
var $Int16         = $newType( 2, $kindInt16,         "int16",          true, "", false, null);
var $Int32         = $newType( 4, $kindInt32,         "int32",          true, "", false, null);
var $Int64         = $newType( 8, $kindInt64,         "int64",          true, "", false, null);
var $Uint          = $newType( 4, $kindUint,          "uint",           true, "", false, null);
var $Uint8         = $newType( 1, $kindUint8,         "uint8",          true, "", false, null);
var $Uint16        = $newType( 2, $kindUint16,        "uint16",         true, "", false, null);
var $Uint32        = $newType( 4, $kindUint32,        "uint32",         true, "", false, null);
var $Uint64        = $newType( 8, $kindUint64,        "uint64",         true, "", false, null);
var $Uintptr       = $newType( 4, $kindUintptr,       "uintptr",        true, "", false, null);
var $Float32       = $newType( 4, $kindFloat32,       "float32",        true, "", false, null);
var $Float64       = $newType( 8, $kindFloat64,       "float64",        true, "", false, null);
var $Complex64     = $newType( 8, $kindComplex64,     "complex64",      true, "", false, null);
var $Complex128    = $newType(16, $kindComplex128,    "complex128",     true, "", false, null);
var $String        = $newType( 8, $kindString,        "string",         true, "", false, null);
var $UnsafePointer = $newType( 4, $kindUnsafePointer, "unsafe.Pointer", true, "", false, null);

var $nativeArray = function(elemKind) {
  switch (elemKind) {
  case $kindInt:
    return Int32Array;
  case $kindInt8:
    return Int8Array;
  case $kindInt16:
    return Int16Array;
  case $kindInt32:
    return Int32Array;
  case $kindUint:
    return Uint32Array;
  case $kindUint8:
    return Uint8Array;
  case $kindUint16:
    return Uint16Array;
  case $kindUint32:
    return Uint32Array;
  case $kindUintptr:
    return Uint32Array;
  case $kindFloat32:
    return Float32Array;
  case $kindFloat64:
    return Float64Array;
  default:
    return Array;
  }
};
var $toNativeArray = function(elemKind, array) {
  var nativeArray = $nativeArray(elemKind);
  if (nativeArray === Array) {
    return array;
  }
  return new nativeArray(array);
};
var $arrayTypes = {};
var $arrayType = function(elem, len) {
  var typeKey = elem.id + "$" + len;
  var typ = $arrayTypes[typeKey];
  if (typ === undefined) {
    typ = $newType(elem.size*len, $kindArray, "[" + len + "]" + elem.string, false, "", false, null);
    $arrayTypes[typeKey] = typ;
    typ.init(elem, len);
  }
  return typ;
};

var $chanType = function(elem, sendOnly, recvOnly) {
  var string = (recvOnly ? "<-" : "") + "chan" + (sendOnly ? "<- " : " ")
  if (!sendOnly && !recvOnly && (elem.string[0] == "<")) {
    string += "(" + elem.string + ")";
  } else {
    string += elem.string;
  }
  var field = sendOnly ? "SendChan" : (recvOnly ? "RecvChan" : "Chan");
  var typ = elem[field];
  if (typ === undefined) {
    typ = $newType(4, $kindChan, string, false, "", false, null);
    elem[field] = typ;
    typ.init(elem, sendOnly, recvOnly);
  }
  return typ;
};
var $Chan = function(elem, capacity) {
  if (capacity < 0 || capacity > 2147483647) {
    $throwRuntimeError("makechan: size out of range");
  }
  this.$elem = elem;
  this.$capacity = capacity;
  this.$buffer = [];
  this.$sendQueue = [];
  this.$recvQueue = [];
  this.$closed = false;
};
var $chanNil = new $Chan(null, 0);
$chanNil.$sendQueue = $chanNil.$recvQueue = { length: 0, push: function() {}, shift: function() { return undefined; }, indexOf: function() { return -1; } };

var $funcTypes = {};
var $funcType = function(params, results, variadic) {
  var typeKey = $mapArray(params, function(p) { return p.id; }).join(",") + "$" + $mapArray(results, function(r) { return r.id; }).join(",") + "$" + variadic;
  var typ = $funcTypes[typeKey];
  if (typ === undefined) {
    var paramTypes = $mapArray(params, function(p) { return p.string; });
    if (variadic) {
      paramTypes[paramTypes.length - 1] = "..." + paramTypes[paramTypes.length - 1].substr(2);
    }
    var string = "func(" + paramTypes.join(", ") + ")";
    if (results.length === 1) {
      string += " " + results[0].string;
    } else if (results.length > 1) {
      string += " (" + $mapArray(results, function(r) { return r.string; }).join(", ") + ")";
    }
    typ = $newType(4, $kindFunc, string, false, "", false, null);
    $funcTypes[typeKey] = typ;
    typ.init(params, results, variadic);
  }
  return typ;
};

var $interfaceTypes = {};
var $interfaceType = function(methods) {
  var typeKey = $mapArray(methods, function(m) { return m.pkg + "," + m.name + "," + m.typ.id; }).join("$");
  var typ = $interfaceTypes[typeKey];
  if (typ === undefined) {
    var string = "interface {}";
    if (methods.length !== 0) {
      string = "interface { " + $mapArray(methods, function(m) {
        return (m.pkg !== "" ? m.pkg + "." : "") + m.name + m.typ.string.substr(4);
      }).join("; ") + " }";
    }
    typ = $newType(8, $kindInterface, string, false, "", false, null);
    $interfaceTypes[typeKey] = typ;
    typ.init(methods);
  }
  return typ;
};
var $emptyInterface = $interfaceType([]);
var $ifaceNil = {};
var $error = $newType(8, $kindInterface, "error", true, "", false, null);
$error.init([{prop: "Error", name: "Error", pkg: "", typ: $funcType([], [$String], false)}]);

var $mapTypes = {};
var $mapType = function(key, elem) {
  var typeKey = key.id + "$" + elem.id;
  var typ = $mapTypes[typeKey];
  if (typ === undefined) {
    typ = $newType(4, $kindMap, "map[" + key.string + "]" + elem.string, false, "", false, null);
    $mapTypes[typeKey] = typ;
    typ.init(key, elem);
  }
  return typ;
};
var $makeMap = function(keyForFunc, entries) {
  var m = {};
  for (var i = 0; i < entries.length; i++) {
    var e = entries[i];
    m[keyForFunc(e.k)] = e;
  }
  return m;
};

var $ptrType = function(elem) {
  var typ = elem.ptr;
  if (typ === undefined) {
    typ = $newType(4, $kindPtr, "*" + elem.string, false, "", elem.exported, null);
    elem.ptr = typ;
    typ.init(elem);
  }
  return typ;
};

var $newDataPointer = function(data, constructor) {
  if (constructor.elem.kind === $kindStruct) {
    return data;
  }
  return new constructor(function() { return data; }, function(v) { data = v; });
};

var $indexPtr = function(array, index, constructor) {
  array.$ptr = array.$ptr || {};
  return array.$ptr[index] || (array.$ptr[index] = new constructor(function() { return array[index]; }, function(v) { array[index] = v; }));
};

var $sliceType = function(elem) {
  var typ = elem.slice;
  if (typ === undefined) {
    typ = $newType(12, $kindSlice, "[]" + elem.string, false, "", false, null);
    elem.slice = typ;
    typ.init(elem);
  }
  return typ;
};
var $makeSlice = function(typ, length, capacity) {
  capacity = capacity || length;
  if (length < 0 || length > 2147483647) {
    $throwRuntimeError("makeslice: len out of range");
  }
  if (capacity < 0 || capacity < length || capacity > 2147483647) {
    $throwRuntimeError("makeslice: cap out of range");
  }
  var array = new typ.nativeArray(capacity);
  if (typ.nativeArray === Array) {
    for (var i = 0; i < capacity; i++) {
      array[i] = typ.elem.zero();
    }
  }
  var slice = new typ(array);
  slice.$length = length;
  return slice;
};

var $structTypes = {};
var $structType = function(pkgPath, fields) {
  var typeKey = $mapArray(fields, function(f) { return f.name + "," + f.typ.id + "," + f.tag; }).join("$");
  var typ = $structTypes[typeKey];
  if (typ === undefined) {
    var string = "struct { " + $mapArray(fields, function(f) {
    var str = f.typ.string + (f.tag !== "" ? (" \"" + f.tag.replace(/\\/g, "\\\\").replace(/"/g, "\\\"") + "\"") : "");
    if (f.embedded) {
      return str
    }
    return f.name + " " + str
    }).join("; ") + " }";
    if (fields.length === 0) {
      string = "struct {}";
    }
    typ = $newType(0, $kindStruct, string, false, "", false, function() {
      this.$val = this;
      for (var i = 0; i < fields.length; i++) {
        var f = fields[i];
        var arg = arguments[i];
        this[f.prop] = arg !== undefined ? arg : f.typ.zero();
      }
    });
    $structTypes[typeKey] = typ;
    typ.init(pkgPath, fields);
  }
  return typ;
};

var $assertType = function(value, type, returnTuple) {
  var isInterface = (type.kind === $kindInterface), ok, missingMethod = "";
  if (value === $ifaceNil) {
    ok = false;
  } else if (!isInterface) {
    ok = value.constructor === type;
  } else {
    var valueTypeString = value.constructor.string;
    ok = type.implementedBy[valueTypeString];
    if (ok === undefined) {
      ok = true;
      var valueMethodSet = $methodSet(value.constructor);
      var interfaceMethods = type.methods;
      for (var i = 0; i < interfaceMethods.length; i++) {
        var tm = interfaceMethods[i];
        var found = false;
        for (var j = 0; j < valueMethodSet.length; j++) {
          var vm = valueMethodSet[j];
          if (vm.name === tm.name && vm.pkg === tm.pkg && vm.typ === tm.typ) {
            found = true;
            break;
          }
        }
        if (!found) {
          ok = false;
          type.missingMethodFor[valueTypeString] = tm.name;
          break;
        }
      }
      type.implementedBy[valueTypeString] = ok;
    }
    if (!ok) {
      missingMethod = type.missingMethodFor[valueTypeString];
    }
  }

  if (!ok) {
    if (returnTuple) {
      return [type.zero(), false];
    }
    $panic(new $packages["runtime"].TypeAssertionError.ptr(
      $packages["runtime"]._type.ptr.nil,
      (value === $ifaceNil ? $packages["runtime"]._type.ptr.nil : new $packages["runtime"]._type.ptr(value.constructor.string)),
      new $packages["runtime"]._type.ptr(type.string),
      missingMethod));
  }

  if (!isInterface) {
    value = value.$val;
  }
  if (type === $jsObjectPtr) {
    value = value.object;
  }
  return returnTuple ? [value, true] : value;
};
`