path: root/src/jsifier.js

// Convert analyzed data to javascript. Everything has already been calculated
// before this stage, which just does the final conversion to JavaScript.

// Main function
function JSify(data, functionsOnly, givenFunctions, givenGlobalVariables) {
  var mainPass = !functionsOnly;

  // Add additional necessary items for the main pass
  if (mainPass) {
    LibraryManager.load();
    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)$/)) {
          libFuncsToInclude.push(key);
        }
      }
    } else {
      libFuncsToInclude = ['memset', 'malloc', 'free'];
    }
    libFuncsToInclude.forEach(function(ident) {
      data.functionStubs.push({
        intertype: 'functionStub',
        ident: '_' + 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();
    });
  }

  substrate = new Substrate('JSifyer');

  var GLOBAL_VARIABLES = !mainPass ? givenGlobalVariables : data.globalVariables;

  Functions.currFunctions = !mainPass ? givenFunctions.currFunctions : {};
  Functions.currExternalFunctions = !mainPass ? givenFunctions.currExternalFunctions : {};

  // Now that first-pass analysis has completed (so we have basic types, etc.), we can get around to handling unparsedFunctions
  (!mainPass ? data.functions : data.unparsedFunctions.concat(data.functions)).forEach(function(func) {
    // Save just what we need, to save memory
    Functions.currFunctions[func.ident] = {
      hasVarArgs: func.hasVarArgs,
      numParams: func.params.length,
      labelIds: func.labelIds // TODO: We need this for globals, but perhaps we can calculate them early and free this
   };
  });

  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
      };
    }
  });

  for (var i = 0; i < data.unparsedFunctions.length; i++) {
    var func = data.unparsedFunctions[i];
    dprint('unparsedFunctions', '====================\n// Processing |' + func.ident + '|, ' + i + '/' + data.unparsedFunctions.length);
    //var t = Date.now();
    func.JS = JSify(analyzer(intertyper(func.lines, true, func.lineNum-1)), true, Functions, GLOBAL_VARIABLES);
    //t = (Date.now()-t)/1000;
    //dprint('unparsedFunctions', 'unparsedFunction took ' + t + ' seconds.');
    delete func.lines; // clean up memory as much as possible
  }

  if (data.unparsedFunctions.length > 0) {
    // We are now doing the final JS generation
    dprint('unparsedFunctions', '== Completed unparsedFunctions ==\n');

    // Save some memory, before the final heavy lifting
    //Functions.currFunctions = null;
    //Functions.currExternalFunctions = null;
    //Debugging.clear();
  }

  // Actors

  // type
  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 = [];
    var i = 0,</