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enhance inline (#3760)

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This commit is contained in:
Alex Lam S.L
2020-04-05 03:42:23 +01:00
committed by GitHub
parent 80d9c44b22
commit 1b07f64057
5 changed files with 151 additions and 17 deletions
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27
lib/compress.js
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@@ -5813,12 +5813,24 @@ merge(Compressor.prototype, {
var is_func = fn instanceof AST_Lambda;
var stat = is_func && fn.first_statement();
var can_inline = compressor.option("inline") && !self.is_expr_pure(compressor);
if (exp === fn && can_inline && stat instanceof AST_Return) {
if (can_inline && stat instanceof AST_Return) {
var value = stat.value;
if (!value || value.is_constant_expression()) {
if (exp === fn && (!value || value.is_constant_expression())) {
var args = self.args.concat(value || make_node(AST_Undefined, self));
return make_sequence(self, args).optimize(compressor);
}
var funarg, pos;
if (value instanceof AST_SymbolRef
&& (funarg = resolve_funarg(value.definition().orig))
&& (pos = fn.argnames.indexOf(funarg)) >= 0
&& (pos >= self.args.length - 1 || all(self.args.slice(pos), function(funarg) {
return !funarg.has_side_effects(compressor);
}))) {
var args = self.args.slice();
args.push(args.splice(pos, 1)[0] || make_node(AST_Undefined, self));
var node = make_sequence(self, args).optimize(compressor);
return maintain_this_binding(compressor, compressor.parent(), compressor.self(), node);
}
}
if (is_func) {
var def, value, scope, in_loop, level = -1;
@@ -5837,7 +5849,8 @@ merge(Compressor.prototype, {
&& can_inject_symbols()) {
fn._squeezed = true;
if (exp !== fn) fn.parent_scope = exp.scope;
return make_sequence(self, flatten_fn()).optimize(compressor);
var node = make_sequence(self, flatten_fn()).optimize(compressor);
return maintain_this_binding(compressor, compressor.parent(), compressor.self(), node);
}
if (compressor.option("side_effects")
&& all(fn.body, is_empty)
@@ -5864,6 +5877,14 @@ merge(Compressor.prototype, {
}
return try_evaluate(compressor, self);
function resolve_funarg(orig) {
var funarg;
for (var i = 0; orig[i] instanceof AST_SymbolFunarg; i++) {
funarg = orig[i];
}
return funarg;
}
function return_value(stat) {
if (!stat) return make_node(AST_Undefined, self);
if (stat instanceof AST_Return) {