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collapse_vars: fix bug in repeated var defs of same name

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This commit is contained in:
kzc 2016-01-27 18:35:49 -05:00
parent 3eb9101918
commit e0961f7b03
2 changed files with 42 additions and 3 deletions
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15
lib/compress.js
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@ -255,16 +255,25 @@ merge(Compressor.prototype, {
var var_defs = prev_stat.definitions;
if (var_defs == null) continue;
// Scan variable definitions from right to left.
var var_names_seen = {};
var side_effects_encountered = false;
var lvalues_encountered = false;
var lvalues = {};
// Scan variable definitions from right to left.
for (var var_defs_index = var_defs.length; --var_defs_index >= 0;) {
// Obtain var declaration and var name with basic sanity check.
var var_decl = var_defs[var_defs_index];
if (var_decl.value == null) continue;
if (var_decl.value == null) break;
var var_name = var_decl.name.name;
if (!var_name || !var_name.length) break;
// Bail if we've seen a var definition of same name before.
if (var_name in var_names_seen) break;
var_names_seen[var_name] = true;
// Only interested in cases with just one reference to the variable.
var var_name = var_decl.name.name;
var def = self.find_variable && self.find_variable(var_name);
if (!def || !def.references || def.references.length !== 1 || var_name == "arguments") {
side_effects_encountered = true;

30
test/compress/collapse_vars.js
View File

@ -1087,3 +1087,33 @@ collapse_vars_short_circuit: {
}
}
collapse_vars_repeat_of_same_var_name: {
options = {
collapse_vars:true, sequences:true, properties:true, dead_code:true, conditionals:true,
comparisons:true, evaluate:true, booleans:true, loops:true, unused:true, hoist_funs:true,
keep_fargs:true, if_return:true, join_vars:true, cascade:true, side_effects:true
}
input: {
(function(x){
var a = "GOOD" + x, e = "BAD", k = "?", e = a;
console.log(e + k);
})("!"),
(function(x){
var a = "GOOD" + x, e = "BAD" + x, k = "?", e = a;
console.log(e + k);
})("!");
}
expect: {
(function(x){
var a = "GOOD" + x, e = "BAD", e = a;
console.log(e + "?");
})("!"),
(function(x){
var a = "GOOD" + x, e = "BAD" + x, e = a;
console.log(e + "?");
})("!");
}
}