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fix corner case in dead_code (#5642)

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fixes #5641
This commit is contained in:
Alex Lam S.L
2022-09-03 23:18:25 +01:00
committed by GitHub
parent e012f046bc
commit 78f354beb8
2 changed files with 42 additions and 7 deletions
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24
lib/compress.js
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@@ -12706,13 +12706,23 @@ Compressor.prototype.compress = function(node) {
return try_evaluate(compressor, self);
function is_tail(node, parent) {
if (parent instanceof AST_Binary) {
return parent.right === node || parent.right.is_constant_expression(scope);
if (parent instanceof AST_Binary) switch (node) {
case parent.left:
return parent.right.is_constant_expression(scope);
case parent.right:
return true;
default:
return false;
}
if (parent instanceof AST_Conditional) {
return parent.condition !== node
|| parent.consequent.is_constant_expression(scope)
&& parent.alternative.is_constant_expression(scope);
if (parent instanceof AST_Conditional) switch (node) {
case parent.condition:
return parent.consequent.is_constant_expression(scope)
&& parent.alternative.is_constant_expression(scope);
case parent.consequent:
case parent.alternative:
return true;
default:
return false;
}
if (parent instanceof AST_Sequence) {
var exprs = parent.expressions;
@@ -12723,7 +12733,7 @@ Compressor.prototype.compress = function(node) {
}
return true;
}
if (parent instanceof AST_UnaryPrefix) return true;
return parent instanceof AST_UnaryPrefix;
}
function is_tail_block(stat, parent) {