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relax collapse_vars on AST_Exit (#2855)

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First introduced in #1862 to stop assignments to migrate beyond `return` or `throw`. Since then `collapse_vars` has been improved to handle various side-effect-related corner cases.
This commit is contained in:
Alex Lam S.L
2018-01-31 23:49:59 +08:00
committed by GitHub
parent 541e6011af
commit 2a4c68be4f
2 changed files with 83 additions and 1 deletions
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1
lib/compress.js
View File

@@ -1044,7 +1044,6 @@ merge(Compressor.prototype, {
// but are otherwise not safe to scan into or beyond them.
var sym;
if (node instanceof AST_Call
|| node instanceof AST_Exit
|| node instanceof AST_PropAccess
&& (side_effects || node.expression.may_throw_on_access(compressor))
|| node instanceof AST_SymbolRef

83
test/compress/collapse_vars.js
View File

@@ -4107,3 +4107,86 @@ unsafe_builtin: {
}
expect_stdout: "1 4"
}
return_1: {
options = {
collapse_vars: true,
unused: true,
}
input: {
var log = console.log;
function f(b, c) {
var a = c;
if (b) return b;
log(a);
}
f(false, 1);
f(true, 2);
}
expect: {
var log = console.log;
function f(b, c) {
if (b) return b;
log(c);
}
f(false, 1);
f(true, 2);
}
expect_stdout: "1"
}
return_2: {
options = {
collapse_vars: true,
unused: true,
}
input: {
var log = console.log;
function f(b, c) {
var a = c();
if (b) return b;
log(a);
}
f(false, function() { return 1 });
f(true, function() { return 2 });
}
expect: {
var log = console.log;
function f(b, c) {
var a = c();
if (b) return b;
log(a);
}
f(false, function() { return 1 });
f(true, function() { return 2 });
}
expect_stdout: "1"
}
return_3: {
options = {
collapse_vars: true,
unused: true,
}
input: {
var log = console.log;
function f(b, c) {
var a = b <<= c;
if (b) return b;
log(a);
}
f(false, 1);
f(true, 2);
}
expect: {
var log = console.log;
function f(b, c) {
var a = b <<= c;
if (b) return b;
log(a);
}
f(false, 1);
f(true, 2);
}
expect_stdout: "0"
}