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fix corner case in reduce_vars (#3667)

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fixes #3666
This commit is contained in:
Alex Lam S.L
2020-01-03 19:28:47 +08:00
committed by GitHub
parent 746f5f6c62
commit fdc10086da
2 changed files with 50 additions and 15 deletions
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34
lib/compress.js
View File

@@ -6797,24 +6797,28 @@ merge(Compressor.prototype, {
var def = self.definition();
var fixed = self.fixed_value();
var single_use = def.single_use && !(parent instanceof AST_Call && parent.is_expr_pure(compressor));
if (single_use && fixed instanceof AST_Lambda) {
if (def.scope !== self.scope
&& (!compressor.option("reduce_funcs") || def.escaped.depth == 1 || fixed.inlined)) {
single_use = false;
} else if (recursive_ref(compressor, def)) {
single_use = false;
} else if (def.scope !== self.scope || def.orig[0] instanceof AST_SymbolFunarg) {
single_use = fixed.is_constant_expression(self.scope);
if (single_use == "f") {
var scope = self.scope;
do if (scope instanceof AST_Defun || scope instanceof AST_Function) {
scope.inlined = true;
} while (scope = scope.parent_scope);
if (single_use) {
if (fixed instanceof AST_Lambda) {
if (def.scope !== self.scope
&& (!compressor.option("reduce_funcs") || def.escaped.depth == 1 || fixed.inlined)) {
single_use = false;
} else if (recursive_ref(compressor, def)) {
single_use = false;
} else if (def.scope !== self.scope || def.orig[0] instanceof AST_SymbolFunarg) {
single_use = fixed.is_constant_expression(self.scope);
if (single_use == "f") {
var scope = self.scope;
do if (scope instanceof AST_Defun || scope instanceof AST_Function) {
scope.inlined = true;
} while (scope = scope.parent_scope);
}
}
if (single_use) fixed.parent_scope = self.scope;
} else if (!fixed || !fixed.is_constant_expression()) {
single_use = false;
}
if (single_use) fixed.parent_scope = self.scope;
}
if (single_use && fixed) {
if (single_use) {
def.single_use = false;
fixed._squeezed = true;
fixed.single_use = true;

31
test/compress/reduce_vars.js
View File

@@ -6847,3 +6847,34 @@ issue_3631_2: {
}
expect_stdout: "undefined"
}
issue_3666: {
options = {
collapse_vars: true,
passes: 2,
reduce_vars: true,
toplevel: true,
unused: true,
}
input: {
try {
var a = "FAIL";
} finally {
for (;!a;)
var c = a++;
var a = "PASS", b = c = "PASS";
}
console.log(a, b);
}
expect: {
try {
var a = "FAIL";
} finally {
for (;!a;)
a++;
var b = a = "PASS";
}
console.log(a, b);
}
expect_stdout: "PASS PASS"
}