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Copy pathparseTools.js
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2644 lines (2457 loc) · 97.4 KB
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//"use strict";
// Various tools for parsing LLVM. Utilities of various sorts, that are
// specific to Emscripten (and hence not in utility.js).
// Does simple 'macro' substitution, using Django-like syntax,
// {{{ code }}} will be replaced with |eval(code)|.
// NOTE: Be careful with that ret check. If ret is |0|, |ret ? ret.toString() : ''| would result in ''!
function processMacros(text) {
return text.replace(/{{{([^}]|}(?!}))+}}}/g, function(str) {
str = str.substr(3, str.length-6);
var ret = eval(str);
return ret !== null ? ret.toString() : '';
});
}
// Simple #if/else/endif preprocessing for a file. Checks if the
// ident checked is true in our global.
function preprocess(text) {
var lines = text.split('\n');
var ret = '';
var showStack = [];
for (var i = 0; i < lines.length; i++) {
var line = lines[i];
if (line[line.length-1] == '\r') {
line = line.substr(0, line.length-1); // Windows will have '\r' left over from splitting over '\r\n'
}
if (!line[0] || line[0] != '#') {
if (showStack.indexOf(false) == -1) {
ret += line + '\n';
}
} else {
if (line[1] && line[1] == 'i') { // if
var parts = line.split(' ');
var ident = parts[1];
var op = parts[2];
var value = parts[3];
if (op) {
if (op === '==') {
showStack.push(ident in this && this[ident] == value);
} else if (op === '!=') {
showStack.push(!(ident in this && this[ident] == value));
} else {
error('unsupported preprecessor op ' + op);
}
} else {
showStack.push(ident in this && this[ident] > 0);
}
} else if (line[2] && line[2] == 'l') { // else
showStack.push(!showStack.pop());
} else if (line[2] && line[2] == 'n') { // endif
showStack.pop();
} else {
throw "Unclear preprocessor command: " + line;
}
}
}
assert(showStack.length == 0);
return ret;
}
function addPointing(type) { return type + '*' }
function removePointing(type, num) {
if (num === 0) return type;
assert(type.substr(type.length-(num ? num : 1)).replace(/\*/g, '') === ''); //, 'Error in removePointing with ' + [type, num, type.substr(type.length-(num ? num : 1))]);
return type.substr(0, type.length-(num ? num : 1));
}
function pointingLevels(type) {
if (!type) return 0;
var ret = 0;
var len1 = type.length - 1;
while (type[len1-ret] && type[len1-ret] === '*') {
ret++;
}
return ret;
}
function removeAllPointing(type) {
return removePointing(type, pointingLevels(type));
}
function toNiceIdent(ident) {
assert(ident);
if (parseFloat(ident) == ident) return ident;
if (ident == 'null') return '0'; // see parseNumerical
if (ident == 'undef') return '0';
return ident.replace('%', '$').replace(/["&\\ \.@:<>,\*\[\]\(\)-]/g, '_');
}
// Kind of a hack. In some cases we have strings that we do not want
// to |toNiceIdent|, as they are the output of previous processing. We
// should refactor everything into an object, with an explicit flag
// saying what has been |toNiceIdent|ed. Until then, this will detect
// simple idents that are in need of |toNiceIdent|ation. Or, we should
// ensure that processed strings never start with %,@, e.g. by always
// enclosing them in ().
function toNiceIdentCarefully(ident) {
if (ident[0] == '%' || ident[0] == '@') ident = toNiceIdent(ident);
return ident;
}
// Returns true if ident is a niceIdent (see toNiceIdent). If loose
// is true, then also allow () and spaces.
function isNiceIdent(ident, loose) {
if (loose) {
return /^\(?[$_]+[\w$_\d ]*\)?$/.test(ident);
} else {
return /^[$_]+[\w$_\d]*$/.test(ident);
}
}
function isJSVar(ident) {
if (ident[0] === '(') {
if (ident[ident.length-1] !== ')') return false;
ident = ident.substr(1, ident.length-2);
}
return /^[$_]?[\w$_\d]* *$/.test(ident);
}
function isLocalVar(ident) {
return ident[0] === '$';
}
// Simple variables or numbers, or things already quoted, do not need to be quoted
function needsQuoting(ident) {
if (/^[-+]?[$_]?[\w$_\d]*$/.test(ident)) return false; // number or variable
if (ident[0] === '(' && ident[ident.length-1] === ')' && ident.indexOf('(', 1) < 0) return false; // already fully quoted
return true;
}
function isStructPointerType(type) {
// This test is necessary for clang - in llvm-gcc, we
// could check for %struct. The downside is that %1 can
// be either a variable or a structure, and we guess it is
// a struct, which can lead to |call i32 %5()| having
// |%5()| as a function call (like |i32 (i8*)| etc.). So
// we must check later on, in call(), where we have more
// context, to differentiate such cases.
// A similar thing happens in isStructType()
return !Runtime.isNumberType(type) && type[0] == '%';
}
function isPointerType(type) {
return type[type.length-1] == '*';
}
function isArrayType(type) {
return /^\[\d+\ x\ (.*)\]/.test(type);
}
function isStructType(type) {
if (isPointerType(type)) return false;
if (isArrayType(type)) return true;
if (/<?{ ?[^}]* ?}>?/.test(type)) return true; // { i32, i8 } etc. - anonymous struct types
// See comment in isStructPointerType()
return type[0] == '%';
}
function isStructuralType(type) {
return /^{ ?[^}]* ?}$/.test(type); // { i32, i8 } etc. - anonymous struct types
}
function getStructuralTypeParts(type) { // split { i32, i8 } etc. into parts
return type.replace(/[ {}]/g, '').split(',');
}
function getStructureTypeParts(type) {
if (isStructuralType(type)) {
return type.replace(/[ {}]/g, '').split(',');
} else {
var typeData = Types.types[type];
assert(typeData, type);
return typeData.fields;
}
}
function getStructuralTypePartBits(part) {
return Math.ceil((getBits(part) || 32)/32)*32; // simple 32-bit alignment. || 32 is for pointers
}
function isIntImplemented(type) {
return type[0] == 'i' || isPointerType(type);
}
// Note: works for iX types and structure types, not pointers (even though they are implemented as ints)
function getBits(type, allowPointers) {
if (allowPointers && isPointerType(type)) return 32;
if (!type) return 0;
if (type[0] == 'i') {
var left = type.substr(1);
if (!isNumber(left)) return 0;
return parseInt(left);
}
if (isStructuralType(type)) {
return sum(getStructuralTypeParts(type).map(getStructuralTypePartBits));
}
if (isStructType(type)) {
var typeData = Types.types[type];
if (typeData === undefined) return 0;
return typeData.flatSize*8;
}
return 0;
}
function getNumIntChunks(type) {
return Math.ceil(getBits(type, true)/32);
}
function isIdenticallyImplemented(type1, type2) {
var floats = +(type1 in Runtime.FLOAT_TYPES) + +(type2 in Runtime.FLOAT_TYPES);
if (floats == 2) return true;
if (floats == 1) return false;
return getNumIntChunks(type1) == getNumIntChunks(type2);
}
function isIllegalType(type) {
var bits = getBits(type);
return bits > 0 && (bits >= 64 || !isPowerOfTwo(bits));
}
function isVoidType(type) {
return type == 'void';
}
// Detects a function definition, ([...|type,[type,...]])
function isFunctionDef(token, out) {
var text = token.text;
var nonPointing = removeAllPointing(text);
if (nonPointing[0] != '(' || nonPointing.substr(-1) != ')')
return false;
if (nonPointing === '()') return true;
if (!token.tokens) return false;
var fail = false;
var segments = splitTokenList(token.tokens);
segments.forEach(function(segment) {
var subtext = segment[0].text;
fail = fail || segment.length > 1 || !(isType(subtext) || subtext == '...');
});
if (out) {
out.segments = segments;
out.numArgs = segments.length;
}
return !fail;
}
function isPossiblyFunctionType(type) {
// A quick but unreliable way to see if something is a function type. Yes is just 'maybe', no is definite.
var len = type.length;
return type[len-2] == ')' && type[len-1] == '*';
}
function isFunctionType(type, out) {
if (!isPossiblyFunctionType(type)) return false;
type = type.substr(0, type.length-1); // remove final '*'
var firstOpen = type.indexOf('(');
if (firstOpen <= 0) return false;
type = type.replace(/"[^"]+"/g, '".."');
var lastOpen = type.lastIndexOf('(');
var returnType;
if (firstOpen == lastOpen) {
returnType = getReturnType(type);
if (!isType(returnType)) return false;
} else {
returnType = 'i8*'; // some pointer type, no point in analyzing further
}
if (out) out.returnType = returnType;
// find ( that starts the arguments
var depth = 0, i = type.length-1, argText = null;
while (i >= 0) {
var curr = type[i];
if (curr == ')') depth++;
else if (curr == '(') {
depth--;
if (depth == 0) {
argText = type.substr(i);
break;
}
}
i--;
}
assert(argText);
return isFunctionDef({ text: argText, tokens: tokenize(argText.substr(1, argText.length-2)) }, out);
}
function getReturnType(type) {
if (pointingLevels(type) > 1) return '*'; // the type of a call can be either the return value, or the entire function. ** or more means it is a return value
var lastOpen = type.lastIndexOf('(');
if (lastOpen > 0) {
return type.substr(0, lastOpen-1);
}
return type;
}
var isTypeCache = {}; // quite hot, optimize as much as possible
function isType(type) {
if (type in isTypeCache) return isTypeCache[type];
var ret = isPointerType(type) || isVoidType(type) || Runtime.isNumberType(type) || isStructType(type) || isFunctionType(type);
isTypeCache[type] = ret;
return ret;
}
function isVarArgsFunctionType(type) {
// assumes this is known to be a function type already
var varArgsSuffix = '...)*';
return type.substr(-varArgsSuffix.length) == varArgsSuffix;
}
function getNumLegalizedVars(type) { // how many legalized variables are needed to represent this type
if (type in Runtime.FLOAT_TYPES) return 1;
return Math.max(getNumIntChunks(type), 1);
}
function countNormalArgs(type, out, legalized) {
out = out || {};
if (!isFunctionType(type, out)) return -1;
var ret = 0;
if (out.segments) {
for (var i = 0; i < out.segments.length; i++) {
ret += legalized ? getNumLegalizedVars(out.segments[i][0].text) : 1;
}
}
if (isVarArgsFunctionType(type)) ret--;
return ret;
}
function getVectorBaseType(type) {
Types.usesSIMD = true;
switch (type) {
case '<2 x float>':
case '<4 x float>': return 'float';
case '<2 x i32>':
case '<4 x i32>': return 'uint';
default: throw 'unknown vector type ' + type;
}
}
function addIdent(token) {
token.ident = token.text;
return token;
}
function combineTokens(tokens) {
var ret = {
lineNum: tokens[0].lineNum,
text: '',
tokens: []
};
tokens.forEach(function(token) {
ret.text += token.text;
ret.tokens.push(token);
});
return ret;
}
function compareTokens(a, b) {
var aId = a.__uid__;
var bId = b.__uid__;
a.__uid__ = 0;
b.__uid__ = 0;
var ret = JSON.stringify(a) == JSON.stringify(b);
a.__uid__ = aId;
b.__uid__ = bId;
return ret;
}
function getTokenIndexByText(tokens, text) {
var i = 0;
while (tokens[i] && tokens[i].text != text) i++;
return i;
}
function findTokenText(item, text) {
return findTokenTextAfter(item, text, 0);
}
function findTokenTextAfter(item, text, startAt) {
for (var i = startAt; i < item.tokens.length; i++) {
if (item.tokens[i].text == text) return i;
}
return -1;
}
var SPLIT_TOKEN_LIST_SPLITTERS = set(',', 'to'); // 'to' can separate parameters as well...
// Splits a list of tokens separated by commas. For example, a list of arguments in a function call
function splitTokenList(tokens) {
if (tokens.length == 0) return [];
if (!tokens.slice) tokens = tokens.tokens;
var ret = [];
var seg = [];
for (var i = 0; i < tokens.length; i++) {
var token = tokens[i];
if (token.text in SPLIT_TOKEN_LIST_SPLITTERS) {
ret.push(seg);
seg = [];
} else if (token.text == ';') {
ret.push(seg);
return ret;
} else {
seg.push(token);
}
}
if (seg.length) ret.push(seg);
return ret;
}
function parseParamTokens(params) {
if (params.length === 0) return [];
var ret = [];
var anonymousIndex = 0;
while (params.length > 0) {
var i = 0;
while (i < params.length && params[i].text != ',') i++;
var segment = params.slice(0, i);
params = params.slice(i+1);
segment = cleanSegment(segment);
var byVal = 0;
if (segment[1] && segment[1].text === 'byval') {
// handle 'byval' and 'byval align X'. We store the alignment in 'byVal'
byVal = QUANTUM_SIZE;
segment.splice(1, 1);
if (segment[1] && segment[1].text === 'nocapture') {
segment.splice(1, 1);
}
if (segment[1] && segment[1].text === 'align') {
assert(isNumber(segment[2].text));
byVal = parseInt(segment[2].text);
segment.splice(1, 2);
}
}
if (segment[1] && segment[1].text === 'nocapture') {
segment.splice(1, 1);
}
if (segment.length == 1) {
if (segment[0].text == '...') {
ret.push({
intertype: 'varargs',
type: 'i8*',
ident: 'varrp' // the conventional name we have for this
});
} else {
// Clang sometimes has a parameter with just a type,
// no name... the name is implied to be %{the index}
ret.push({
intertype: 'value',
type: segment[0].text,
ident: toNiceIdent('%') + anonymousIndex
});
Types.needAnalysis[ret[ret.length-1].type] = 0;
anonymousIndex ++;
}
} else if (segment[1].text in PARSABLE_LLVM_FUNCTIONS) {
ret.push(parseLLVMFunctionCall(segment));
} else if (segment[1].text === 'blockaddress') {
ret.push(parseBlockAddress(segment));
} else if (segment[1].type && segment[1].type == '{') {
ret.push(parseLLVMSegment(segment));
} else {
if (segment[2] && segment[2].text == 'to') { // part of bitcast params
segment = segment.slice(0, 2);
}
while (segment.length > 2) {
segment[0].text += segment[1].text;
segment.splice(1, 1); // TODO: merge tokens nicely
}
ret.push({
intertype: 'value',
type: segment[0].text,
ident: toNiceIdent(parseNumerical(segment[1].text, segment[0].text))
});
Types.needAnalysis[removeAllPointing(ret[ret.length-1].type)] = 0;
}
ret[ret.length-1].byVal = byVal;
}
return ret;
}
function hasVarArgs(params) {
for (var i = 0; i < params.length; i++) {
if (params[i].intertype == 'varargs') {
return true;
}
}
return false;
}
var UNINDEXABLE_GLOBALS = set(
'_llvm_global_ctors' // special-cased
);
function isIndexableGlobal(ident) {
if (!(ident in Variables.globals)) return false;
if (ident in UNINDEXABLE_GLOBALS) {
Variables.globals[ident].unIndexable = true;
return false;
}
var data = Variables.globals[ident];
return !data.alias && !data.external;
}
function isBSS(item) {
if (!USE_BSS) {
return false;
}
if (item.external) return false; // externals are typically implemented in a JS library, and must be accessed by name, explicitly
// return true if a global is uninitialized or initialized to 0
return (item.value && item.value.intertype === 'emptystruct') ||
(item.value && item.value.value !== undefined && item.value.value === '0');
}
function makeGlobalDef(ident) {
if (!NAMED_GLOBALS && isIndexableGlobal(ident)) return '';
return 'var ' + ident + ';';
}
function makeGlobalUse(ident) {
if (!NAMED_GLOBALS && isIndexableGlobal(ident)) {
var index = Variables.indexedGlobals[ident];
if (index === undefined) {
// we are accessing this before we index globals, likely from the library. mark as unindexable
UNINDEXABLE_GLOBALS[ident] = 1;
return ident;
}
var ret = (Runtime.GLOBAL_BASE + index).toString();
if (SIDE_MODULE) ret = '(H_BASE+' + ret + ')';
return ret;
}
return ident;
}
function sortGlobals(globals) {
var ks = keys(globals);
ks.sort();
var inv = invertArray(ks);
return values(globals).sort(function(a, b) {
// sort globals based on if they need to be explicitly initialized or not (moving
// values that don't need to be to the end of the array). if equal, sort by name.
return (Number(isBSS(a)) - Number(isBSS(b))) ||
(inv[b.ident] - inv[a.ident]);
});
}
function finalizeParam(param) {
if (param.intertype in PARSABLE_LLVM_FUNCTIONS) {
return finalizeLLVMFunctionCall(param);
} else if (param.intertype === 'blockaddress') {
return finalizeBlockAddress(param);
} else if (param.intertype === 'jsvalue') {
return param.ident;
} else {
if (param.type == 'i64' && USE_TYPED_ARRAYS == 2) {
return parseI64Constant(param.ident);
}
var ret = toNiceIdent(param.ident);
if (ret in Variables.globals) {
ret = makeGlobalUse(ret);
}
return ret;
}
}
// Segment ==> Parameter
function parseLLVMSegment(segment) {
var type;
if (segment.length == 1) {
if (isType(segment[0].text)) {
Types.needAnalysis[segment[0].text] = 0;
return {
intertype: 'type',
ident: toNiceIdent(segment[0].text),
type: segment[0].text
};
} else {
return {
intertype: 'value',
ident: toNiceIdent(segment[0].text),
type: 'i32'
};
}
} else if (segment[1].type && segment[1].type == '{') {
type = segment[0].text;
Types.needAnalysis[type] = 0;
return {
intertype: 'structvalue',
params: splitTokenList(segment[1].tokens).map(parseLLVMSegment),
type: type
};
} else if (segment[0].text in PARSABLE_LLVM_FUNCTIONS) {
return parseLLVMFunctionCall([{text: '?'}].concat(segment));
} else if (segment[1].text in PARSABLE_LLVM_FUNCTIONS) {
return parseLLVMFunctionCall(segment);
} else if (segment[1].text === 'blockaddress') {
return parseBlockAddress(segment);
} else {
type = segment[0].text;
if (type[type.length-1] === '>' && segment[1].text[0] === '<') {
// vector literal
return {
intertype: 'vector',
idents: splitTokenList(segment[1].tokens).map(function(pair) {
return pair[1].text;
}),
type: type
};
}
Types.needAnalysis[type] = 0;
return {
intertype: 'value',
ident: toNiceIdent(segment[1].text),
type: type
};
}
}
function cleanSegment(segment) {
while (segment.length >= 2 && ['noalias', 'sret', 'nocapture', 'nest', 'zeroext', 'signext'].indexOf(segment[1].text) != -1) {
segment.splice(1, 1);
}
return segment;
}
var MATHOPS = set(['add', 'sub', 'sdiv', 'udiv', 'mul', 'icmp', 'zext', 'urem', 'srem', 'fadd', 'fsub', 'fmul', 'fdiv', 'fcmp', 'frem', 'uitofp', 'sitofp', 'fpext', 'fptrunc', 'fptoui', 'fptosi', 'trunc', 'sext', 'select', 'shl', 'shr', 'ashl', 'ashr', 'lshr', 'lshl', 'xor', 'or', 'and', 'ptrtoint', 'inttoptr']);
var PARSABLE_LLVM_FUNCTIONS = set('getelementptr', 'bitcast');
mergeInto(PARSABLE_LLVM_FUNCTIONS, MATHOPS);
// Parses a function call of form
// TYPE functionname MODIFIERS (...)
// e.g.
// i32* getelementptr inbounds (...)
function parseLLVMFunctionCall(segment) {
segment = segment.slice(0);
segment = cleanSegment(segment);
// Remove additional modifiers
var variant = null;
if (!segment[2] || !segment[2].tokens) {
variant = segment.splice(2, 1)[0];
if (variant && variant.text) variant = variant.text; // needed for mathops
}
assertTrue(['inreg', 'byval'].indexOf(segment[1].text) == -1);
assert(segment[1].text in PARSABLE_LLVM_FUNCTIONS);
while (!segment[2].tokens) {
segment.splice(2, 1); // Remove modifiers
if (!segment[2]) throw 'Invalid segment!';
}
var intertype = segment[1].text;
var type = segment[0].text;
if (type === '?') {
if (intertype === 'getelementptr') {
type = '*'; // a pointer, we can easily say, this is
} else if (segment[2].tokens.slice(-2)[0].text === 'to') {
type = segment[2].tokens.slice(-1)[0].text;
}
}
var ret = {
intertype: intertype,
variant: variant,
type: type,
params: parseParamTokens(segment[2].tokens)
};
Types.needAnalysis[ret.type] = 0;
ret.ident = toNiceIdent(ret.params[0].ident || 'NOIDENT');
return ret;
}
// Gets an array of tokens, we parse out the first
// 'ident' - either a simple ident of one token, or
// an LLVM internal function that generates an ident.
// We shift out of the array list the tokens that
// we ate.
function eatLLVMIdent(tokens) {
var ret;
if (tokens[0].text in PARSABLE_LLVM_FUNCTIONS) {
var item = parseLLVMFunctionCall([{text: '?'}].concat(tokens.slice(0,2))); // TODO: Handle more cases, return a full object, process it later
if (item.intertype == 'bitcast') checkBitcast(item);
ret = item.ident;
tokens.shift();
tokens.shift();
} else {
ret = tokens[0].text;
tokens.shift();
}
return ret;
}
function cleanOutTokens(filterOut, tokens, indexes) {
if (typeof indexes !== 'object') indexes = [indexes];
for (var i = indexes.length-1; i >=0; i--) {
var index = indexes[i];
while (index < tokens.length && tokens[index].text in filterOut) {
tokens.splice(index, 1);
}
}
}
function _IntToHex(x) {
assert(x >= 0 && x <= 15);
if (x <= 9) {
return String.fromCharCode('0'.charCodeAt(0) + x);
} else {
return String.fromCharCode('A'.charCodeAt(0) + x - 10);
}
}
function IEEEUnHex(stringy) {
stringy = stringy.substr(2); // leading '0x';
if (stringy.replace(/0/g, '') === '') return 0;
while (stringy.length < 16) stringy = '0' + stringy;
if (FAKE_X86_FP80 && stringy.length > 16) {
stringy = stringy.substr(stringy.length-16, 16);
assert(TARGET_X86, 'must only see >64 bit floats in x86, as fp80s');
warnOnce('.ll contains floating-point values with more than 64 bits. Faking values for them. If they are used, this will almost certainly break horribly!');
}
assert(stringy.length === 16, 'Can only unhex 16-digit double numbers, nothing platform-specific'); // |long double| can cause x86_fp80 which causes this
var top = eval('0x' + stringy[0]);
var neg = !!(top & 8); // sign
if (neg) {
stringy = _IntToHex(top & ~8) + stringy.substr(1);
}
var a = eval('0x' + stringy.substr(0, 8)); // top half
var b = eval('0x' + stringy.substr(8)); // bottom half
var e = a >> ((52 - 32) & 0x7ff); // exponent
a = a & 0xfffff;
if (e === 0x7ff) {
if (a == 0 && b == 0) {
return neg ? '-Infinity' : 'Infinity';
} else {
return 'NaN';
}
}
e -= 1023; // offset
var absolute = ((((a | 0x100000) * 1.0) / Math.pow(2,52-32)) * Math.pow(2, e)) + (((b * 1.0) / Math.pow(2, 52)) * Math.pow(2, e));
return (absolute * (neg ? -1 : 1)).toString();
}
// Given an expression like (VALUE=VALUE*2,VALUE<10?VALUE:t+1) , this will
// replace VALUE with value. If value is not a simple identifier of a variable,
// value will be replaced with tempVar.
function makeInlineCalculation(expression, value, tempVar) {
if (!isNiceIdent(value, true)) {
expression = tempVar + '=' + value + ',' + expression;
value = tempVar;
}
return '(' + expression.replace(/VALUE/g, value) + ')';
}
// Makes a proper runtime value for a 64-bit value from low and high i32s. low and high are assumed to be unsigned.
function makeI64(low, high) {
high = high || '0';
if (USE_TYPED_ARRAYS == 2) {
return '[' + makeSignOp(low, 'i32', 'un', 1, 1) + ',' + makeSignOp(high, 'i32', 'un', 1, 1) + ']';
} else {
if (high) return RuntimeGenerator.makeBigInt(low, high);
return low;
}
}
// XXX Make all i64 parts signed
// Splits a number (an integer in a double, possibly > 32 bits) into an USE_TYPED_ARRAYS == 2 i64 value.
// Will suffer from rounding. mergeI64 does the opposite.
function splitI64(value, floatConversion) {
// general idea:
//
// $1$0 = ~~$d >>> 0;
// $1$1 = Math_abs($d) >= 1 ? (
// $d > 0 ? Math.min(Math_floor(($d)/ 4294967296.0), 4294967295.0)
// : Math_ceil(Math.min(-4294967296.0, $d - $1$0)/ 4294967296.0)
// ) : 0;
//
// We need to min on positive values here, since our input might be a double, and large values are rounded, so they can
// be slightly higher than expected. And if we get 4294967296, that will turn into a 0 if put into a
// HEAP32 or |0'd, etc.
//
// For negatives, we need to ensure a -1 if the value is overall negative, even if not significant negative component
var lowInput = legalizedI64s ? value : 'VALUE';
if (floatConversion && ASM_JS) lowInput = asmFloatToInt(lowInput);
var low = lowInput + '>>>0';
var high = makeInlineCalculation(
asmCoercion('Math_abs(VALUE)', 'double') + ' >= ' + asmEnsureFloat('1', 'double') + ' ? ' +
'(VALUE > ' + asmEnsureFloat('0', 'double') + ' ? ' +
asmCoercion('Math_min(' + asmCoercion('Math_floor((VALUE)/' + asmEnsureFloat(4294967296, 'float') + ')', 'double') + ', ' + asmEnsureFloat(4294967295, 'float') + ')', 'i32') + '>>>0' +
' : ' + asmFloatToInt(asmCoercion('Math_ceil((VALUE - +((' + asmFloatToInt('VALUE') + ')>>>0))/' + asmEnsureFloat(4294967296, 'float') + ')', 'double')) + '>>>0' +
')' +
' : 0',
value,
'tempDouble'
);
if (legalizedI64s) {
return [low, high];
} else {
return makeI64(low, high);
}
}
function mergeI64(value, unsigned) {
assert(USE_TYPED_ARRAYS == 2);
if (legalizedI64s) {
return RuntimeGenerator.makeBigInt(value + '$0', value + '$1', unsigned);
} else {
return makeInlineCalculation(RuntimeGenerator.makeBigInt('VALUE[0]', 'VALUE[1]', unsigned), value, 'tempI64');
}
}
// Takes an i64 value and changes it into the [low, high] form used in i64 mode 1. In that
// mode, this is a no-op
function ensureI64_1(value) {
if (USE_TYPED_ARRAYS == 2) return value;
return splitI64(value, 1);
}
function makeCopyI64(value) {
assert(USE_TYPED_ARRAYS == 2);
return value + '.slice(0)';
}
// Given a string representation of an integer of arbitrary size, return it
// split up into 32-bit chunks
function parseArbitraryInt(str, bits) {
// We parse the string into a vector of digits, base 10. This is convenient to work on.
assert(bits > 0); // NB: we don't check that the value in str can fit in this amount of bits
function str2vec(s) { // index 0 is the highest value
var ret = [];
for (var i = 0; i < s.length; i++) {
ret.push(s.charCodeAt(i) - '0'.charCodeAt(0));
}
return ret;
}
function divide2(v) { // v /= 2
for (var i = v.length-1; i >= 0; i--) {
var d = v[i];
var r = d % 2;
d = Math.floor(d/2);
v[i] = d;
if (r) {
assert(i+1 < v.length);
var d2 = v[i+1];
d2 += 5;
if (d2 >= 10) {
v[i] = d+1;
d2 -= 10;
}
v[i+1] = d2;
}
}
}
function mul2(v) { // v *= 2
for (var i = v.length-1; i >= 0; i--) {
var d = v[i]*2;
r = d >= 10;
v[i] = d%10;
var j = i-1;
if (r) {
if (j < 0) {
v.unshift(1);
break;
}
v[j] += 0.5; // will be multiplied
}
}
}
function subtract(v, w) { // v -= w. we assume v >= w
while (v.length > w.length) w.splice(0, 0, 0);
for (var i = 0; i < v.length; i++) {
v[i] -= w[i];
if (v[i] < 0) {
v[i] += 10;
// find something to take from
var j = i-1;
while (v[j] == 0) {
v[j] = 9;
j--;
assert(j >= 0);
}
v[j]--;
}
}
}
function isZero(v) {
for (var i = 0; i < v.length; i++) {
if (v[i] > 0) return false;
}
return true;
}
var v;
if (str[0] == '-') {
// twos-complement is needed
str = str.substr(1);
v = str2vec('1');
for (var i = 0; i < bits; i++) {
mul2(v);
}
subtract(v, str2vec(str));
} else {
v = str2vec(str);
}
var bitsv = [];
while (!isZero(v)) {
bitsv.push((v[v.length-1] % 2 != 0)+0);
v[v.length-1] = v[v.length-1] & 0xfe;
divide2(v);
}
var ret = zeros(Math.ceil(bits/32));
for (var i = 0; i < bitsv.length; i++) {
ret[Math.floor(i/32)] += bitsv[i]*Math.pow(2, i % 32);
}
return ret;
}
function parseI64Constant(str, legalized) {
if (!isNumber(str)) {
// This is a variable. Copy it, so we do not modify the original
return legalizedI64s ? str : makeCopyI64(str);
}
var parsed = parseArbitraryInt(str, 64);
if (legalizedI64s || legalized) return parsed;
return '[' + parsed[0] + ',' + parsed[1] + ']';
}
function parseNumerical(value, type) {
if ((!type || type === 'double' || type === 'float') && /^0x/.test(value)) {
// Hexadecimal double value, as the llvm docs say,
// "The one non-intuitive notation for constants is the hexadecimal form of floating point constants."
value = IEEEUnHex(value);
} else if (USE_TYPED_ARRAYS == 2 && isIllegalType(type)) {
return value; // do not parseFloat etc., that can lead to loss of precision
} else if (value === 'null') {
// NULL *is* 0, in C/C++. No JS null! (null == 0 is false, etc.)
value = '0';
} else if (value === 'true') {
return '1';
} else if (value === 'false') {
return '0';
}
if (isNumber(value)) {
var ret = parseFloat(value); // will change e.g. 5.000000e+01 to 50
if (type === 'double' || type === 'float') {
if (value[0] === '-' && ret === 0) return '-.0'; // fix negative 0, toString makes it 0
if (!RUNNING_JS_OPTS) ret = asmEnsureFloat(ret, type);
}
return ret.toString();
} else {
return value;
}
}
// \0Dsometext is really '\r', then sometext
// This function returns an array of int values
function parseLLVMString(str) {
var ret = [];
var i = 0;
while (i < str.length) {
var chr = str.charCodeAt(i);
if (chr !== 92) { // 92 === '//'.charCodeAt(0)
ret.push(chr);
i++;
} else {
ret.push(parseInt(str[i+1]+str[i+2], '16'));
i += 3;
}
}
return ret;
}
function getLabelIds(labels) {
return labels.map(function(label) { return label.ident });
}
function cleanLabel(label) {
if (label[0] == 'B') {
return label.substr(5);
} else {
return label;
}
}
function getOldLabel(label) {
var parts = label.split('|');
return parts[parts.length-1];
}
function calcAllocatedSize(type) {
if (pointingLevels(type) == 0 && isStructType(type)) {
return Types.types[type].flatSize; // makeEmptyStruct(item.allocatedType).length;
} else {
return Runtime.getNativeTypeSize(type); // We can really get away with '1', though, at least on the stack...