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improve compress (#3814)

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- avoid identifier overflow through consecutive API calls
- simplify `reduce_vars`
- enhance `unsafe` `evaluate`
This commit is contained in:
Alex Lam S.L
2020-04-23 23:50:53 +01:00
committed by GitHub
parent 99cf3a38c5
commit 3ee13cae02
3 changed files with 43 additions and 22 deletions
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29
lib/scope.js
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@@ -43,23 +43,21 @@
"use strict";
function SymbolDef(scope, orig, init) {
function SymbolDef(id, scope, orig, init) {
this.eliminated = 0;
this.global = false;
this.id = id;
this.init = init;
this.lambda = orig instanceof AST_SymbolLambda;
this.mangled_name = null;
this.name = orig.name;
this.orig = [ orig ];
this.init = init;
this.eliminated = 0;
this.scope = scope;
this.references = [];
this.replaced = 0;
this.global = false;
this.mangled_name = null;
this.scope = scope;
this.undeclared = false;
this.id = SymbolDef.next_id++;
this.lambda = orig instanceof AST_SymbolLambda;
}
SymbolDef.next_id = 1;
SymbolDef.prototype = {
unmangleable: function(options) {
return this.global && !options.toplevel
@@ -151,6 +149,7 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(options) {
scope.def_variable(node).defun = defun;
}
});
self.next_def_id = 0;
self.walk(tw);
// pass 2: find back references and eval
@@ -240,12 +239,18 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(options) {
}
});
AST_Scope.DEFMETHOD("make_def", function(orig, init) {
var top = this;
while (top.parent_scope) top = top.parent_scope;
return new SymbolDef(++top.next_def_id, this, orig, init);
});
AST_Toplevel.DEFMETHOD("def_global", function(node) {
var globals = this.globals, name = node.name;
if (globals.has(name)) {
return globals.get(name);
} else {
var g = new SymbolDef(this, node);
var g = this.make_def(node);
g.undeclared = true;
g.global = true;
globals.set(name, g);
@@ -310,7 +315,7 @@ AST_Scope.DEFMETHOD("def_variable", function(symbol, init) {
def.orig.push(symbol);
if (def.init instanceof AST_Function) def.init = init;
} else {
def = new SymbolDef(this, symbol, init);
def = this.make_def(symbol, init);
this.variables.set(symbol.name, def);
def.global = !this.parent_scope;
}