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improve reduce_vars and fix a bug

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- update modified flag between compress() passes
- support IIFE arguments
- fix corner case with multiple definitions

closes #1473
This commit is contained in:
alexlamsl
2017-02-18 19:19:55 +08:00
parent b8b133d91a
commit a0f4fd390a
3 changed files with 161 additions and 30 deletions
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26
lib/scope.js
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@@ -183,17 +183,6 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(options){
var func = null;
var globals = self.globals = new Dictionary();
var tw = new TreeWalker(function(node, descend){
function isModified(node, level) {
var parent = tw.parent(level);
if (parent instanceof AST_Unary && (parent.operator === "++" || parent.operator === "--")
|| parent instanceof AST_Assign && parent.left === node
|| parent instanceof AST_Call && parent.expression === node) {
return true;
} else if (parent instanceof AST_PropAccess && parent.expression === node) {
return isModified(parent, level + 1);
}
}
if (node instanceof AST_Lambda) {
var prev_func = func;
func = node;
@@ -217,21 +206,16 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(options){
node.scope.uses_arguments = true;
}
if (!sym) {
var g;
if (globals.has(name)) {
g = globals.get(name);
sym = globals.get(name);
} else {
g = new SymbolDef(self, globals.size(), node);
g.undeclared = true;
g.global = true;
globals.set(name, g);
sym = new SymbolDef(self, globals.size(), node);
sym.undeclared = true;
sym.global = true;
globals.set(name, sym);
}
sym = g;
}
node.thedef = sym;
if (isModified(node, 0)) {
sym.modified = true;
}
node.reference(options);
return true;
}