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jsifier.js
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jsifier.js
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//"use strict";
// Convert analyzed data to javascript. Everything has already been calculated
// before this stage, which just does the final conversion to JavaScript.
// Handy sets
var STRUCT_LIST = set('struct', 'list');
var UNDERSCORE_OPENPARENS = set('_', '(');
var RELOOP_IGNORED_LASTS = set('return', 'unreachable', 'resume');
// JSifier
function JSify(data, functionsOnly, givenFunctions) {
var mainPass = !functionsOnly;
if (mainPass) {
var shellFile = SHELL_FILE ? SHELL_FILE : (BUILD_AS_SHARED_LIB ? 'shell_sharedlib.js' : 'shell.js');
if (phase == 'pre') {
// We will start to print out the data, but must do so carefully - we are
// dealing with potentially *huge* strings. Convenient replacements and
// manipulations may create in-memory copies, and we may OOM.
//
// Final shape that will be created:
// shell
// (body)
// preamble
// runtime
// generated code
// postamble
// global_vars
//
// First, we print out everything until the generated code. Then the
// functions will print themselves out as they are parsed. Finally, we
// will call finalCombiner in the main pass, to print out everything
// else. This lets us not hold any strings in memory, we simply print
// things out as they are ready.
var shellParts = read(shellFile).split('{{BODY}}');
print(shellParts[0]);
var preFile = BUILD_AS_SHARED_LIB ? 'preamble_sharedlib.js' : 'preamble.js';
var pre = processMacros(preprocess(read(preFile).replace('{{RUNTIME}}', getRuntime())));
print(pre);
Functions.implementedFunctions = set(data.unparsedFunctions.map(function(func) { return func.ident }));
}
}
// Does simple 'macro' substitution, using Django-like syntax,
// {{{ code }}} will be replaced with |eval(code)|.
function processMacros(text) {
return text.replace(/{{{[^}]+}}}/g, function(str) {
str = str.substr(3, str.length-6);
return eval(str).toString();
});
}
var substrate = new Substrate('JSifyer');
if (mainPass) {
// Handle unparsed types TODO: Batch them
analyzer(intertyper(data.unparsedTypess[0].lines, true), true);
data.unparsedTypess = null;
// Add additional necessary items for the main pass. We can now do this since types are parsed (types can be used through
// generateStructInfo in library.js)
LibraryManager.load();
if (phase == 'pre') {
var libFuncsToInclude;
if (INCLUDE_FULL_LIBRARY) {
assert(!BUILD_AS_SHARED_LIB, 'Cannot have both INCLUDE_FULL_LIBRARY and BUILD_AS_SHARED_LIB set.')
libFuncsToInclude = [];
for (var key in LibraryManager.library) {
if (!key.match(/__(deps|postset|inline)$/)) {
libFuncsToInclude.push(key);
}
}
} else {
libFuncsToInclude = DEFAULT_LIBRARY_FUNCS_TO_INCLUDE;
}
libFuncsToInclude.forEach(function(ident) {
data.functionStubs.push({
intertype: 'functionStub',
ident: '_' + ident
});
});
}
}
// Functions
Functions.currExternalFunctions = !mainPass ? givenFunctions.currExternalFunctions : {};
data.functionStubs.forEach(function(func) {
// Don't overwrite stubs that have more info.
if (!Functions.currExternalFunctions.hasOwnProperty(func.ident) ||
!Functions.currExternalFunctions[func.ident].numParams === undefined) {
Functions.currExternalFunctions[func.ident] = {
hasVarArgs: func.hasVarArgs,
numParams: func.params && func.params.length
};
}
});
if (phase == 'funcs') { // pre has function shells, just to defined implementedFunctions
var MAX_BATCH_FUNC_LINES = 1000;
while (data.unparsedFunctions.length > 0) {
var currFuncLines = [];
var currBaseLineNums = [];
while (currFuncLines.length == 0 ||
(data.unparsedFunctions.length > 0 && currFuncLines.length + data.unparsedFunctions[0].lines.length <= MAX_BATCH_FUNC_LINES)) {
currBaseLineNums.push([currFuncLines.length, data.unparsedFunctions[0].lineNum-1]);
currFuncLines = currFuncLines.concat(data.unparsedFunctions[0].lines); // for first one, assign, do not concat?
data.unparsedFunctions.shift();
}
dprint('unparsedFunctions','====================\n// Processing function batch of ' + currBaseLineNums.length +
' functions, ' + currFuncLines.length + ' lines, functions left: ' + data.unparsedFunctions.length);
if (DEBUG_MEMORY) MemoryDebugger.tick('pre-func');
JSify(analyzer(intertyper(currFuncLines, true, currBaseLineNums), true), true, Functions);
if (DEBUG_MEMORY) MemoryDebugger.tick('post-func');
}
currFuncLines = currBaseLineNums = null; // Do not hold on to anything from inside that loop (JS function scoping..)
data.unparsedFunctions = null;
}
// Actors
// type
// FIXME: This is no longer used, we do not actually need to JSify on types. TODO: Remove this and related code
substrate.addActor('Type', {
processItem: function(item) {
var type = Types.types[item.name_];
var niceName = toNiceIdent(item.name_);
// We might export all of Types.types, cleaner that way, but do not want slowdowns in accessing flatteners
item.JS = 'var ' + niceName + '___SIZE = ' + Types.types[item.name_].flatSize + '; // ' + item.name_ + '\n';
if (type.needsFlattening && !type.flatFactor) {
item.JS += 'var ' + niceName + '___FLATTENER = ' + JSON.stringify(Types.types[item.name_].flatIndexes) + ';';
}
return [item];
}
});
function makeEmptyStruct(type) {
var ret = [];
var typeData = Types.types[type];
assertTrue(typeData);
for (var i = 0; i < typeData.flatSize; i++) {
ret.push(0);
}
return ret;
}
function alignStruct(values, type) {
var typeData = Types.types[type];
assertTrue(typeData);
var ret = new Array(typeData.flatSize);
var index = 0;
var i = 0;
while (i < values.length) {
// Pad until the right place
var padded = typeData.flatFactor ? typeData.flatFactor*i : typeData.flatIndexes[i];
while (index < padded) {
ret[index++] = 0;
}
// Add current value(s)
var currValue = values[i];
if (USE_TYPED_ARRAYS == 2 && typeData.fields[i] == 'i64') {
// 'flatten' out the 64-bit value into two 32-bit halves
var parts = parseI64Constant(currValue, true);
ret[index++] = parts[0];
ret[index++] = 0;
ret[index++] = 0;
ret[index++] = 0;
ret[index++] = parts[1];
ret[index++] = 0;
ret[index++] = 0;
ret[index++] = 0;
} else {
currValue = flatten(currValue);
if (typeof currValue == 'object') {
for (var j = 0; j < currValue.length; j++) {
ret[index++] = currValue[j];
}
} else {
ret[index++] = currValue;
}
}
i += 1;
}
while (index < typeData.flatSize) {
ret[index++] = 0;
}
return ret;
}
// Gets an entire constant expression
function makeConst(value, type, ident) {
// Gets an array of constant items, separated by ',' tokens
function handleSegments(tokens) {
// Handle a single segment (after comma separation)
function handleSegment(segment) {
var ret;
if (segment.intertype === 'value') {
ret = segment.ident;
} else if (segment.intertype === 'emptystruct') {
ret = makeEmptyStruct(segment.type);
} else if (segment.intertype in PARSABLE_LLVM_FUNCTIONS) {
ret = finalizeLLVMFunctionCall(segment);
} else if (segment.intertype in STRUCT_LIST) {
ret = alignStruct(handleSegments(segment.contents), segment.type);
} else if (segment.intertype === 'string') {
ret = parseLLVMString(segment.text); // + ' /* ' + text + '*/';
} else if (segment.intertype === 'blockaddress') {
ret = finalizeBlockAddress(segment);
} else {
throw 'Invalid segment: ' + dump(segment);
}
assert(segment.type, 'Missing type for constant segment!');
return makeGlobalUse(indexizeFunctions(ret, segment.type));
};
return tokens.map(handleSegment)
}
//dprint('jsifier const: ' + JSON.stringify(value) + ',' + type + '\n');
if (value.intertype in PARSABLE_LLVM_FUNCTIONS) {
return [finalizeLLVMFunctionCall(value)];
} else if (Runtime.isNumberType(type) || pointingLevels(type) >= 1) {
return makeGlobalUse(indexizeFunctions(parseNumerical(value.value), type));
} else if (value.intertype === 'emptystruct') {
return makeEmptyStruct(type);
} else if (value.intertype === 'string') {
return JSON.stringify(parseLLVMString(value.text)) +
' /* ' + value.text.substr(0, 20).replace(/[*<>]/g, '_') + ' */'; // make string safe for inclusion in comment
} else {
return alignStruct(handleSegments(value.contents), type);
}
}
function parseConst(value, type, ident) {
var constant = makeConst(value, type);
if (typeof constant === 'object') {
constant = flatten(constant).map(function(x) { return parseNumerical(x) })
}
return constant;
}
// globalVariable
substrate.addActor('GlobalVariable', {
processItem: function(item) {
function needsPostSet(value) {
return value[0] in UNDERSCORE_OPENPARENS || value.substr(0, 14) === 'CHECK_OVERFLOW'
|| value.substr(0, 6) === 'GLOBAL';
}
item.intertype = 'GlobalVariableStub';
assert(!item.lines); // FIXME remove this, after we are sure it isn't needed
var ret = [item];
if (item.ident == '_llvm_global_ctors') {
item.JS = '\n__ATINIT__ = __ATINIT__.concat([\n' +
item.ctors.map(function(ctor) { return ' { func: ' + toNiceIdent(ctor) + ' }' }).join(',\n') +
'\n]);\n';
return ret;
} else {
var constant = null;
var allocator = (BUILD_AS_SHARED_LIB && !item.external) ? 'ALLOC_NORMAL' : 'ALLOC_STATIC';
var index = null;
if (item.external && BUILD_AS_SHARED_LIB) {
// External variables in shared libraries should not be declared as
// they would shadow similarly-named globals in the parent.
item.JS = '';
} else {
item.JS = makeGlobalDef(item.ident);
}
if (item.external) {
// Import external global variables from the library if available.
var shortident = item.ident.slice(1);
if (LibraryManager.library[shortident] &&
LibraryManager.library[shortident].length &&
!BUILD_AS_SHARED_LIB) {
var val = LibraryManager.library[shortident];
var padding;
if (Runtime.isNumberType(item.type) || isPointerType(item.type)) {
padding = [item.type].concat(zeros(Runtime.getNativeFieldSize(item.type)-1));
} else {
padding = makeEmptyStruct(item.type);
}
var padded = val.concat(padding.slice(val.length));
var js = item.ident + '=' + makePointer(JSON.stringify(padded), null, allocator, item.type, index) + ';'
if (LibraryManager.library[shortident + '__postset']) {
js += '\n' + LibraryManager.library[shortident + '__postset'];
}
ret.push({
intertype: 'GlobalVariablePostSet',
JS: js
});
}
return ret;
} else {
if (!NAMED_GLOBALS && isIndexableGlobal(item.ident)) {
index = makeGlobalUse(item.ident); // index !== null indicates we are indexing this
allocator = 'ALLOC_NONE';
}
constant = parseConst(item.value, item.type, item.ident);
if (typeof constant === 'string' && constant[0] != '[') {
constant = [constant]; // A single item. We may need a postset for it.
}
if (typeof constant === 'object') {
// This is a flattened object. We need to find its idents, so they can be assigned to later
constant.forEach(function(value, i) {
if (needsPostSet(value)) { // ident, or expression containing an ident
ret.push({
intertype: 'GlobalVariablePostSet',
JS: makeSetValue(makeGlobalUse(item.ident), i, value, 'i32', false, true) + ';' // ignore=true, since e.g. rtti and statics cause lots of safe_heap errors
});
constant[i] = '0';
}
});
constant = '[' + constant.join(', ') + ']';
}
// NOTE: This is the only place that could potentially create static
// allocations in a shared library.
constant = makePointer(constant, null, allocator, item.type, index);
var js;
js = (index !== null ? '' : item.ident + '=') + constant + ';'; // \n Module.print("' + item.ident + ' :" + ' + makeGlobalUse(item.ident) + ');';
// Special case: class vtables. We make sure they are null-terminated, to allow easy runtime operations
if (item.ident.substr(0, 5) == '__ZTV') {
if (index !== null) {
index = getFastValue(index, '+', Runtime.alignMemory(calcAllocatedSize(Variables.globals[item.ident].type)));
}
js += '\n' + makePointer('[0]', null, allocator, ['void*'], index) + ';';
}
if (EXPORT_ALL || (item.ident in EXPORTED_GLOBALS)) {
js += '\nModule["' + item.ident + '"] = ' + item.ident + ';';
}
if (BUILD_AS_SHARED_LIB == 2 && !item.private_) {
// TODO: make the assert conditional on ASSERTIONS
js += 'if (globalScope) { assert(!globalScope["' + item.ident + '"]); globalScope["' + item.ident + '"] = ' + item.ident + ' }';
}
return ret.concat({
intertype: 'GlobalVariable',
JS: js,
});
}
}
}
});
// alias
substrate.addActor('Alias', {
processItem: function(item) {
item.intertype = 'GlobalVariableStub';
var ret = [item];
item.JS = 'var ' + item.ident + ';';
// Set the actual value in a postset, since it may be a global variable. We also order by dependencies there
var value = Variables.globals[item.ident].resolvedAlias = finalizeLLVMParameter(item.value);
var fix = '';
if (BUILD_AS_SHARED_LIB == 2 && !item.private_) {
var target = item.ident;
if (isFunctionType(item.type)) {
target = item.value.ident; // the other side does not know this is an alias/function table index. So make it the alias target.
var varData = Variables.globals[target];
assert(!varData, 'multi-level aliasing does not work yet in shared lib 2 exports');
}
fix = '\nif (globalScope) { assert(!globalScope["' + item.ident + '"]); globalScope["' + item.ident + '"] = ' + target + ' }'
}
ret.push({
intertype: 'GlobalVariablePostSet',
ident: item.ident,
dependencies: set([value]),
JS: item.ident + ' = ' + value + ';' + fix
});
return ret;
}
});
var addedLibraryItems = {};
// functionStub
substrate.addActor('FunctionStub', {
processItem: function(item) {
function addFromLibrary(ident) {
if (ident in addedLibraryItems) return '';
addedLibraryItems[ident] = true;
// dependencies can be JS functions, which we just run
if (typeof ident == 'function') return ident();
// Don't replace implemented functions with library ones (which can happen when we add dependencies).
// Note: We don't return the dependencies here. Be careful not to end up where this matters
if (('_' + ident) in Functions.implementedFunctions) return '';
var snippet = LibraryManager.library[ident];
var redirectedIdent = null;
var deps = LibraryManager.library[ident + '__deps'] || [];
var isFunction = false;
if (typeof snippet === 'string') {
if (LibraryManager.library[snippet]) {
// Redirection for aliases. We include the parent, and at runtime make ourselves equal to it.
// This avoid having duplicate functions with identical content.
redirectedIdent = snippet;
deps.push(snippet);
snippet = '_' + snippet;
}
} else if (typeof snippet === 'object') {
snippet = stringifyWithFunctions(snippet);
} else if (typeof snippet === 'function') {
isFunction = true;
snippet = snippet.toString();
assert(snippet.indexOf('XXX missing C define') == -1,
'Trying to include a library function with missing C defines: ' + ident + ' | ' + snippet);
// name the function; overwrite if it's already named
snippet = snippet.replace(/function(?:\s+([^(]+))?\s*\(/, 'function _' + ident + '(');
if (LIBRARY_DEBUG) {
snippet = snippet.replace('{', '{ var ret = (function() { if (Runtime.debug) Module.print("[library call:' + ident + ': " + Array.prototype.slice.call(arguments).map(Runtime.prettyPrint) + "]"); ');
snippet = snippet.substr(0, snippet.length-1) + '}).apply(this, arguments); if (Runtime.debug && typeof ret !== "undefined") Module.print(" [ return:" + Runtime.prettyPrint(ret)); return ret; }';
}
}
var postsetId = ident + '__postset';
var postset = LibraryManager.library[postsetId];
if (postset && !addedLibraryItems[postsetId]) {
addedLibraryItems[postsetId] = true;
ret.push({
intertype: 'GlobalVariablePostSet',
JS: postset
});
}
if (redirectedIdent) {
deps = deps.concat(LibraryManager.library[redirectedIdent + '__deps'] || []);
}
// $ident's are special, we do not prefix them with a '_'.
if (ident[0] === '$') {
ident = ident.substr(1);
} else {
ident = '_' + ident;
}
var text = (deps ? '\n' + deps.map(addFromLibrary).filter(function(x) { return x != '' }).join('\n') : '');
text += isFunction ? snippet : 'var ' + ident + '=' + snippet + ';';
if (EXPORT_ALL || (ident in EXPORTED_FUNCTIONS)) {
text += '\nModule["' + ident + '"] = ' + ident + ';';
}
return text;
}
var ret = [item];
if (IGNORED_FUNCTIONS.indexOf(item.ident) >= 0) return null;
var shortident = item.ident.substr(1);
if (BUILD_AS_SHARED_LIB) {
// Shared libraries reuse the runtime of their parents.
item.JS = '';
} else if (LibraryManager.library.hasOwnProperty(shortident)) {
item.JS = addFromLibrary(shortident);
} else {
item.JS = 'var ' + item.ident + '; // stub for ' + item.ident;
if (WARN_ON_UNDEFINED_SYMBOLS) {
warn('Unresolved symbol: ' + item.ident);
}
}
return ret;
}
});
// function splitter
substrate.addActor('FunctionSplitter', {
processItem: function(item) {
var ret = [item];
item.splitItems = 0;
item.labels.forEach(function(label) {
label.lines.forEach(function(line) {
line.func = item.ident;
line.funcData = item; // TODO: remove all these, access it globally
line.parentLabel = label.ident;
ret.push(line);
item.splitItems ++;
});
});
this.forwardItems(ret, 'FuncLineTriager');
}
});
// function for filtering functions for label debugging
if (LABEL_FUNCTION_FILTERS.length > 0) {
var LABEL_FUNCTION_FILTER_SET = set(LABEL_FUNCTION_FILTERS);
var functionNameFilterTest = function(ident) {
return (ident in LABEL_FUNCTION_FILTER_SET);
};
} else {
// no filters are specified, all function names are printed
var functionNameFilterTest = function(ident) {
return true;
}
}
// function reconstructor & post-JS optimizer
substrate.addActor('FunctionReconstructor', {
funcs: {},
seen: {},
processItem: function(item) {
if (this.seen[item.__uid__]) return null;
if (item.intertype == 'function') {
this.funcs[item.ident] = item;
item.relines = {};
this.seen[item.__uid__] = true;
return null;
}
var line = item;
var func = this.funcs[line.func];
if (!func) return null;
// Re-insert our line
this.seen[item.__uid__] = true;
var label = func.labels.filter(function(label) { return label.ident == line.parentLabel })[0];
label.lines = label.lines.map(function(line2) {
return (line2.lineNum !== line.lineNum) ? line2 : line;
});
func.splitItems --;
// OLD delete line.funcData; // clean up
if (func.splitItems > 0) return null;
// We have this function all reconstructed, go and finalize it's JS!
if (IGNORED_FUNCTIONS.indexOf(func.ident) >= 0) return null;
func.JS = '\n';
var paramIdents = func.params.map(function(param) {
return (param.intertype == 'varargs') ? null : toNiceIdent(param.ident);
}).filter(function(param) { return param != null; })
if (CLOSURE_ANNOTATIONS) {
func.JS += '/**\n';
paramIdents.forEach(function(param) {
func.JS += ' * @param {number} ' + param + '\n';
});
func.JS += ' * @return {number}\n'
func.JS += ' */\n';
}
if (PRINT_SPLIT_FILE_MARKER) {
func.JS += '\n//FUNCTION_BEGIN_MARKER\n'
var associatedSourceFile = "NO_SOURCE";
}
func.JS += 'function ' + func.ident + '(' + paramIdents.join(', ') + ') {\n';
if (PROFILE) {
func.JS += ' if (PROFILING) { '
+ 'var __parentProfilingNode__ = PROFILING_NODE; PROFILING_NODE = PROFILING_NODE.children["' + func.ident + '"]; '
+ 'if (!PROFILING_NODE) __parentProfilingNode__.children["' + func.ident + '"] = PROFILING_NODE = { time: 0, children: {}, calls: 0 };'
+ 'PROFILING_NODE.calls++; '
+ 'var __profilingStartTime__ = Date.now() '
+ '}\n';
}
// Prepare the stack, if we need one. If we have other stack allocations, force the stack to be set up.
func.JS += ' ' + RuntimeGenerator.stackEnter(func.initialStack, func.otherStackAllocations) + ';\n';
// Make copies of by-value params
// XXX It is not clear we actually need this. While without this we fail, it does look like
// Clang normally does the copy itself, in the calling function. We only need this code
// when Clang optimizes the code and passes the original, not the copy, to the other
// function. But Clang still copies, the copy is just unused! Need to figure out if that
// is caused by our running just some optimizations (the safe ones), or if its a bug
// in Clang, or a bug in our understanding of the IR.
func.params.forEach(function(param) {
if (param.byVal) {
var type = removePointing(param.type);
var typeInfo = Types.types[type];
func.JS += ' var tempParam = ' + param.ident + '; ' + param.ident + ' = ' + RuntimeGenerator.stackAlloc(typeInfo.flatSize) + ';' +
makeCopyValues(param.ident, 'tempParam', typeInfo.flatSize, 'null', null, param.byVal) + ';\n';
}
});
if (LABEL_DEBUG && functionNameFilterTest(func.ident)) func.JS += " Module.print(INDENT + ' Entering: " + func.ident + ": ' + Array.prototype.slice.call(arguments)); INDENT += ' ';\n";
if (true) { // TODO: optimize away when not needed
if (CLOSURE_ANNOTATIONS) func.JS += '/** @type {number} */';
func.JS += ' var label;\n';
}
// Walk function blocks and generate JS
function walkBlock(block, indent) {
if (!block) return '';
dprint('relooping', 'walking block: ' + block.type + ',' + block.entries + ' : ' + block.labels.length);
function getLabelLines(label, indent, relooping) {
if (!label) return '';
var ret = '';
if ((LABEL_DEBUG >= 2) && functionNameFilterTest(func.ident)) {
ret += indent + "Module.print(INDENT + '" + func.ident + ":" + label.ident + "');\n";
}
if (EXECUTION_TIMEOUT > 0) {
ret += indent + 'if (Date.now() - START_TIME >= ' + (EXECUTION_TIMEOUT*1000) + ') throw "Timed out!" + (new Error().stack);\n';
}
if (PRINT_SPLIT_FILE_MARKER && Debugging.on && Debugging.getAssociatedSourceFile(line.lineNum)) {
// Overwrite the associated source file for every line. The last line should contain the source file associated to
// the return value/address of outer most block (the marked function).
associatedSourceFile = Debugging.getAssociatedSourceFile(line.lineNum);
}
// for special labels we care about (for phi), mark that we visited them
var i = 0;
return ret + label.lines.map(function(line) {
var JS = line.JS;
if (relooping && i == label.lines.length-1) {
if (line.intertype == 'branch' || line.intertype == 'switch') {
JS = ''; // just branching operations - done in the relooper, so nothing need be done here
} else if (line.intertype == 'invoke') {
JS = line.reloopingJS; // invokes have code that is not rendered in the relooper (the call inside a try-catch)
}
}
i++;
return JS + (Debugging.on ? Debugging.getComment(line.lineNum) : '');
})
.join('\n')
.split('\n') // some lines include line breaks
.map(function(line) { return indent + line })
.join('\n');
}
var ret = '';
if (!RELOOP || func.forceEmulated) { // TODO: also if just 1 label?
if (block.labels.length > 1) {
if (block.entries.length == 1) {
ret += indent + 'label = ' + getLabelId(block.entries[0]) + '; ' + (SHOW_LABELS ? '/* ' + getOriginalLabelId(block.entries[0]) + ' */' : '') + '\n';
} // otherwise, should have been set before!
if (func.setjmpTable) {
var setjmpTable = {};
ret += indent + 'var mySetjmpIds = {};\n';
ret += indent + 'var setjmpTable = {';
func.setjmpTable.forEach(function(triple) { // original label, label we created for right after the setjmp, variable setjmp result goes into
ret += '"' + getLabelId(triple[0]) + '": ' + 'function(value) { label = ' + getLabelId(triple[1]) + '; ' + triple[2] + ' = value },';
});
ret += 'dummy: 0';
ret += '};\n';
}
ret += indent + 'while(1) ';
if (func.setjmpTable) {
ret += 'try { ';
}
ret += 'switch(label) {\n';
ret += block.labels.map(function(label) {
return indent + ' case ' + getLabelId(label.ident) + ': ' + (SHOW_LABELS ? '// ' + getOriginalLabelId(label.ident) : '') + '\n'
+ getLabelLines(label, indent + ' ');
}).join('\n');
ret += '\n' + indent + ' default: assert(0, "bad label: " + label);\n' + indent + '}';
if (func.setjmpTable) {
ret += ' } catch(e) { if (!e.longjmp || !(e.id in mySetjmpIds)) throw(e); setjmpTable[setjmpLabels[e.id]](e.value) }';
}
} else {
ret += (SHOW_LABELS ? indent + '/* ' + block.entries[0] + ' */' : '') + '\n' + getLabelLines(block.labels[0], indent);
}
ret += '\n';
} else {
// Reloop multiple blocks using the compiled relooper
//Relooper.setDebug(1);
Relooper.init();
var blockMap = {};
// add blocks
for (var i = 0; i < block.labels.length; i++) {
var label = block.labels[i];
var content = getLabelLines(label, '', true);
//printErr(func.ident + ' : ' + label.ident + ' : ' + content + '\n');
blockMap[label.ident] = Relooper.addBlock(content);
}
// add branchings
function relevant(x) { return x && x.length > 2 ? x : 0 } // ignores ';' which valueJS and label*JS can be if empty
for (var i = 0; i < block.labels.length; i++) {
var label = block.labels[i];
var ident = label.ident;
var last = label.lines[label.lines.length-1];
//printErr('zz last ' + dump(last));
if (last.intertype == 'branch') {
if (last.label) { // 1 target
Relooper.addBranch(blockMap[ident], blockMap[last.label], 0, relevant(last.labelJS));
} else { // 2 targets
Relooper.addBranch(blockMap[ident], blockMap[last.labelTrue], last.valueJS, relevant(last.labelTrueJS));
Relooper.addBranch(blockMap[ident], blockMap[last.labelFalse], 0, relevant(last.labelFalseJS));
}
} else if (last.intertype == 'switch') {
last.groupedLabels.forEach(function(switchLabel) {
Relooper.addBranch(blockMap[ident], blockMap[switchLabel.label], switchLabel.value, relevant(switchLabel.labelJS));
});
Relooper.addBranch(blockMap[ident], blockMap[last.defaultLabel], 0, relevant(last.defaultLabelJS));
} else if (last.intertype == 'invoke') {
Relooper.addBranch(blockMap[ident], blockMap[last.toLabel], '!__THREW__', relevant(last.toLabelJS));
Relooper.addBranch(blockMap[ident], blockMap[last.unwindLabel], 0, relevant(last.unwindLabelJS));
} else if (last.intertype in RELOOP_IGNORED_LASTS) {
} else {
throw 'unknown reloop last line: ' + last.intertype;
}
}
ret += Relooper.render(blockMap[block.entries[0]]);
}
return ret;
}
func.JS += walkBlock(func.block, ' ');
// Finalize function
if (LABEL_DEBUG && functionNameFilterTest(func.ident)) func.JS += " INDENT = INDENT.substr(0, INDENT.length-2);\n";
// Add an unneeded return, needed for strict mode to not throw warnings in some cases.
// If we are not relooping, then switches make it unimportant to have this (and, we lack hasReturn anyhow)
if (RELOOP && func.lines.length > 0 && func.labels.filter(function(label) { return label.hasReturn }).length > 0) {
func.JS += ' return' + (func.returnType !== 'void' ? ' null' : '') + ';\n';
}
func.JS += '}\n';
if (PRINT_SPLIT_FILE_MARKER) {
func.JS += '\n//FUNCTION_END_MARKER_OF_SOURCE_FILE_' + associatedSourceFile + '\n';
}
if (EXPORT_ALL || (func.ident in EXPORTED_FUNCTIONS)) {
func.JS += 'Module["' + func.ident + '"] = ' + func.ident + ';';
}
if (INLINING_LIMIT && func.lines.length >= INLINING_LIMIT) {
func.JS += func.ident + '["X"]=1;';
}
if (BUILD_AS_SHARED_LIB == 2) {
// TODO: make the assert conditional on ASSERTIONS
func.JS += 'if (globalScope) { assert(!globalScope["' + func.ident + '"]); globalScope["' + func.ident + '"] = ' + func.ident + ' }';
}
func.JS = func.JS.replace(/\n *;/g, '\n'); // remove unneeded lines
return func;
}
});
function getVarData(funcData, ident) {
var local = funcData.variables[ident];
if (local) return local;
var global = Variables.globals[ident];
return global || null;
}
function getVarImpl(funcData, ident) {
if (ident === 'null' || isNumber(ident)) return VAR_NATIVIZED; // like nativized, in that we have the actual value right here
var data = getVarData(funcData, ident);
assert(data, 'What variable is this? |' + ident + '|');
return data.impl;
}
substrate.addActor('FuncLineTriager', {
processItem: function(item) {
if (item.intertype == 'function') {
this.forwardItem(item, 'FunctionReconstructor'); // XXX not really needed
} else if (item.JS) {
this.forwardItem(item, 'FunctionReconstructor'); // XXX not really needed
} else {
this.forwardItem(item, 'Intertype:' + item.intertype);
}
}
});
// An interitem that has |assignTo| is an assign to that item. They call this function which
// generates the actual assignment.
function makeAssign(item) {
var valueJS = item.JS;
item.JS = '';
if (CLOSURE_ANNOTATIONS) item.JS += '/** @type {number} */ ';
item.JS += (item.overrideSSA ? '' : 'var ') + toNiceIdent(item.assignTo);
var value = parseNumerical(valueJS);
var impl = getVarImpl(item.funcData, item.assignTo);
switch (impl) {
case VAR_NATIVE: {
break;
}
case VAR_NATIVIZED: {
// SSA, so this must be the alloca. No need for a value
if (!item.overrideSSA) value = '';
break;
}
case VAR_EMULATED: {
break;
}
default: throw 'zz unknown impl: ' + impl;
}
if (value && value != ';') {
item.JS += '=' + value;
}
if (item.JS[item.JS.length-1] != ';') {
item.JS += ';';
}
}
// Function lines
function makeFuncLineActor(intertype, func) {
return substrate.addActor('Intertype:' + intertype, {
processItem: function(item) {
item.JS = func(item);
if (!item.JS) throw "No JS generated for " + dump(item);
if (item.assignTo) {
makeAssign(item);
if (!item.JS) throw "No assign JS generated for " + dump(item);
}
this.forwardItem(item, 'FunctionReconstructor');
}
});
}
makeFuncLineActor('value', function(item) {
return item.ident;
});
makeFuncLineActor('noop', function(item) {
return ';';
});
makeFuncLineActor('var', function(item) { // assigns into phis become simple vars
return 'var ' + item.ident + ';';
});
makeFuncLineActor('store', function(item) {
var value = finalizeLLVMParameter(item.value);
if (pointingLevels(item.pointerType) == 1) {
value = parseNumerical(value, item.valueType);
}
var impl = VAR_EMULATED;
if (item.pointer.intertype == 'value') {
impl = getVarImpl(item.funcData, item.ident);
}
switch (impl) {
case VAR_NATIVIZED:
if (isNumber(item.ident)) {
// Direct write to a memory address; this may be an intentional segfault, if not, it is a bug in the source
return 'throw "fault on write to ' + item.ident + '";';
}
return item.ident + '=' + value + ';'; // We have the actual value here
break;
case VAR_EMULATED:
if (item.pointer.intertype == 'value') {
return makeSetValue(makeGlobalUse(item.ident), 0, value, item.valueType, 0, 0, item.align) + ';';
} else {
return makeSetValue(0, finalizeLLVMParameter(item.pointer), value, item.valueType, 0, 0, item.align) + ';';
}
break;
default:
throw 'unknown [store] impl: ' + impl;
}
return null;
});
makeFuncLineActor('deleted', function(item) { return ';' });
function getOriginalLabelId(label) {
var funcData = Framework.currItem.funcData;
var labelIdsInverse = funcData.labelIdsInverse;
return labelIdsInverse[label];
}
function getLabelId(label) {
return label;
}
function makeBranch(label, lastLabel, labelIsVariable) { // lastLabel is deprecated
var pre = '';
if (label[0] == 'B') {
assert(!labelIsVariable, 'Cannot handle branches to variables with special branching options');
var parts = label.split('|');
var trueLabel = parts[1] || '';
var oldLabel = parts[2] || '';
var labelSetting = oldLabel ? 'label = ' + getLabelId(oldLabel) + ';' +
(SHOW_LABELS ? ' /* to: ' + getOriginalLabelId(cleanLabel(oldLabel)) + ' */' : '') : ''; // TODO: optimize away the setting
if (label[1] == 'R') {
if (label[2] == 'N') { // BRNOL: break, no label setting
labelSetting = '';
}
return pre + labelSetting + 'break ' + trueLabel + ';';
} else if (label[1] == 'C') { // CONT
if (label[2] == 'N') { // BCNOL: continue, no label setting
labelSetting = '';
}
return pre + labelSetting + 'continue ' + trueLabel + ';';
} else if (label[1] == 'N') { // NOPP
return pre + ';'; // Returning no text might confuse this parser
} else if (label[1] == 'J') { // JSET
return pre + labelSetting + ';';
} else {
throw 'Invalid B-op in branch: ' + trueLabel + ',' + oldLabel;
}
} else {
if (!labelIsVariable) label = getLabelId(label);
return pre + 'label = ' + label + ';' + (SHOW_LABELS ? ' /* to: ' + getOriginalLabelId(cleanLabel(label)) + ' */' : '') + ' break;';
}
}
function calcPhiSets(item) {
if (!item.phi) return null;
var phiSets = {};
item.dependent.params.forEach(function(param) {
if (!phiSets[param.targetLabel]) phiSets[param.targetLabel] = [];
phiSets[param.targetLabel].push(param);
param.valueJS = finalizeLLVMParameter(param.value);
});
return phiSets;
}
function getPhiSetsForLabel(phiSets, label) {
if (!phiSets) return '';
label = getOldLabel(label);
if (!phiSets[label]) return '';
var labelSets = phiSets[label];
// FIXME: Many of the |var |s here are not needed, but without them we get slowdowns with closure compiler. TODO: remove this workaround.
if (labelSets.length == 1) {
return 'var ' + labelSets[0].ident + ' = ' + labelSets[0].valueJS + ';';
}
// TODO: eliminate unneeded sets (to undefined etc.)
var deps = {}; // for each ident we will set, which others it depends on
var valueJSes = {};
labelSets.forEach(function(labelSet) {
deps[labelSet.ident] = {};
valueJSes[labelSet.ident] = labelSet.valueJS;
});
labelSets.forEach(function(labelSet) {
walkInterdata(labelSet.value, function mark(item) {
if (item.intertype == 'value' && item.ident in deps && labelSet.ident != item.ident) {
deps[labelSet.ident][item.ident] = true;
}
});
});
var pre = '', post = '', idents;
mainLoop: while ((idents = keys(deps)).length > 0) {
var remove = function(ident) {
for (var i = 0; i < idents.length; i++) {
delete deps[idents[i]][ident];
}
delete deps[ident];
}
for (var i = 0; i < idents.length; i++) {
if (keys(deps[idents[i]]).length == 0) {
pre = 'var ' + idents[i] + ' = ' + valueJSes[idents[i]] + ';' + pre;
remove(idents[i]);
continue mainLoop;
}
}
// If we got here, we have circular dependencies, and must break at least one.
pre = 'var ' + idents[0] + '$phi = ' + valueJSes[idents[0]] + ';' + pre;
post += 'var ' + idents[0] + ' = ' + idents[0] + '$phi;';
remove(idents[0]);
}
return pre + post;
/* // Safe, unoptimized copying
var ret = '';
for (var i = 0; i < labelSets.length-1; i++) {
ret += 'var ' + labelSets[i].ident + '$phi = ' + labelSets[i].valueJS + ';';
}
ret += labelSets[labelSets.length-1].ident + ' = ' + labelSets[labelSets.length-1].valueJS + ';';
for (var i = 0; i < labelSets.length-1; i++) {
ret += labelSets[i].ident + ' = ' + labelSets[i].ident + '$phi;';
}
return ret;
*/
}
makeFuncLineActor('branch', function(item) {
var phiSets = calcPhiSets(item);
if (!item.value) {
return (item.labelJS = getPhiSetsForLabel(phiSets, item.label)) + makeBranch(item.label, item.currLabelId);
} else {
var condition = item.valueJS = finalizeLLVMParameter(item.value);
var labelTrue = (item.labelTrueJS = getPhiSetsForLabel(phiSets, item.labelTrue)) + makeBranch(item.labelTrue, item.currLabelId);
var labelFalse = (item.labelFalseJS = getPhiSetsForLabel(phiSets, item.labelFalse)) + makeBranch(item.labelFalse, item.currLabelId);
if (labelTrue == ';' && labelFalse == ';') return ';';
var head = 'if (' + condition + ') { ';
var head2 = 'if (!(' + condition + ')) { ';
var else_ = ' } else { ';
var tail = ' }';
if (labelTrue == ';') {
return head2 + labelFalse + tail;
} else if (labelFalse == ';') {
return head + labelTrue + tail;
} else {
return head + labelTrue + else_ + labelFalse + tail;
}
}
});
makeFuncLineActor('switch', function(item) {
// TODO: Find a case where switch is important, and benchmark that. var SWITCH_IN_SWITCH = 1;
var phiSets = calcPhiSets(item);
// Consolidate checks that go to the same label. This is important because it makes the relooper simpler and faster.
var targetLabels = {}; // for each target label, the list of values going to it
var switchLabelMap = {};
item.switchLabels.forEach(function(switchLabel) {
switchLabelMap[switchLabel.label] = switchLabel;
if (!targetLabels[switchLabel.label]) {
targetLabels[switchLabel.label] = [];
}
targetLabels[switchLabel.label].push(switchLabel.value);
});
var ret = '';
var first = true;
var signedIdent = makeSignOp(item.ident, item.type, 're'); // we need to standardize for purpose of comparison
if (RELOOP) {