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- discard statements with no side effects (unsafe? could be)
- safer hoist_vars (needs some revamping of scope/mangling)
This commit is contained in:
Mihai Bazon
2012-09-11 13:15:55 +03:00
parent 1579c0fb97
commit da407d46c6
4 changed files with 110 additions and 31 deletions
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16
lib/scope.js
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@@ -50,7 +50,8 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(){
// times on the same tree.
// pass 1: setup scope chaining and handle definitions
var scope = this.parent_scope;
var self = this;
var scope = self.parent_scope = null;
var labels = {};
var tw = new TreeWalker(function(node, descend){
if (node instanceof AST_Scope) {
@@ -110,7 +111,7 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(){
node.reference(sym);
}
});
this.walk(tw);
self.walk(tw);
// pass 2: find back references and eval
var func = null;
@@ -137,7 +138,7 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(){
}
}
});
this.walk(tw);
self.walk(tw);
});
AST_Scope.DEFMETHOD("init_scope_vars", function(){
@@ -364,6 +365,14 @@ AST_Toplevel.DEFMETHOD("compute_char_frequency", function(){
var tw = new TreeWalker(function(node){
if (node instanceof AST_Constant)
base54.consider(node.print_to_string());
else if (node instanceof AST_Return)
base54.consider("return");
else if (node instanceof AST_Throw)
base54.consider("throw");
else if (node instanceof AST_Continue)
base54.consider("continue");
else if (node instanceof AST_Break)
base54.consider("break");
else if (node instanceof AST_Debugger)
base54.consider("debugger");
else if (node instanceof AST_Directive)
@@ -420,7 +429,6 @@ AST_Toplevel.DEFMETHOD("compute_char_frequency", function(){
base54.consider(node.property);
});
this.walk(tw);
base54.sort();
});
var base54 = (function() {