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enhance if_return (#3560)

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This commit is contained in:
Alex Lam S.L
2019-11-01 02:08:31 +08:00
committed by GitHub
parent 1e9b576ee9
commit 815eff1f7c
2 changed files with 47 additions and 12 deletions
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31
lib/compress.js
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@@ -1749,9 +1749,7 @@ merge(Compressor.prototype, {
if (stat instanceof AST_If) {
var ab = aborts(stat.body);
if (can_merge_flow(ab)) {
if (ab.label) {
remove(ab.label.thedef.references, ab);
}
if (ab.label) remove(ab.label.thedef.references, ab);
CHANGED = true;
stat = stat.clone();
stat.condition = stat.condition.negate(compressor);
@@ -1779,23 +1777,34 @@ merge(Compressor.prototype, {
}
}
var ab = aborts(stat.alternative);
if (can_merge_flow(ab)) {
if (ab.label) {
remove(ab.label.thedef.references, ab);
}
var alt = aborts(stat.alternative);
if (can_merge_flow(alt)) {
if (alt.label) remove(alt.label.thedef.references, alt);
CHANGED = true;
stat = stat.clone();
stat.body = make_node(AST_BlockStatement, stat.body, {
body: as_statement_array(stat.body).concat(extract_functions())
});
var body = as_statement_array_with_return(stat.alternative, ab);
var body = as_statement_array_with_return(stat.alternative, alt);
stat.alternative = make_node(AST_BlockStatement, stat.alternative, {
body: body
});
statements[i] = stat.transform(compressor);
continue;
}
if (compressor.option("typeofs")) {
if (ab && !alt) {
mark_locally_defined(stat.condition, null, make_node(AST_BlockStatement, self, {
body: statements.slice(i + 1)
}));
}
if (!ab && alt) {
mark_locally_defined(stat.condition, make_node(AST_BlockStatement, self, {
body: statements.slice(i + 1)
}));
}
}
}
if (stat instanceof AST_If && stat.body instanceof AST_Return) {
@@ -1940,9 +1949,7 @@ merge(Compressor.prototype, {
&& loop_body(lct) === self
|| stat instanceof AST_Continue
&& loop_body(lct) === self) {
if (stat.label) {
remove(stat.label.thedef.references, stat);
}
if (stat.label) remove(stat.label.thedef.references, stat);
} else {
statements[n++] = stat;
}