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runtime.js
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74 lines (62 loc) · 1.8 KB
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/**
* @license
* Copyright 2010 The Emscripten Authors
* SPDX-License-Identifier: MIT
*/
//"use strict";
var Compiletime = {
isPointerType: isPointerType,
isStructType: isStructType,
isNumberType: function(type) {
return type in Compiletime.INT_TYPES || type in Compiletime.FLOAT_TYPES;
},
INT_TYPES: set('i1', 'i8', 'i16', 'i32', 'i64'),
FLOAT_TYPES: set('float', 'double'),
};
// code used both at compile time and runtime is defined here, then put on
// the Runtime object for compile time and support.js for the generated code
function getNativeTypeSize(type) {
switch (type) {
case 'i1': case 'i8': return 1;
case 'i16': return 2;
case 'i32': return 4;
case 'i64': return 8;
case 'float': return 4;
case 'double': return 8;
default: {
if (type[type.length-1] === '*') {
return 4; // A pointer
} else if (type[0] === 'i') {
var bits = Number(type.substr(1));
assert(bits % 8 === 0, 'getNativeTypeSize invalid bits ' + bits + ', type ' + type);
return bits / 8;
} else {
return 0;
}
}
}
}
function alignMemory(size, factor) {
if (!factor) factor = STACK_ALIGN; // stack alignment (16-byte) by default
return Math.ceil(size / factor) * factor;
}
var Runtime = {
getNativeTypeSize: getNativeTypeSize,
//! Returns the size of a structure field, as C/C++ would have it (in 32-bit,
//! for now).
//! @param type The type, by name.
getNativeFieldSize: function(type) {
return Math.max(getNativeTypeSize(type), Runtime.QUANTUM_SIZE);
},
POINTER_SIZE: 4,
QUANTUM_SIZE: 4,
};
// Additional runtime elements, that need preprocessing
// "Process info" for syscalls is static and cannot change, so define it using
// some fixed values
var PROCINFO = {
ppid: 1,
pid: 42,
sid: 42,
pgid: 42
};