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enhance hoist_props & reduce_vars (#5183)

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closes #5182
This commit is contained in:
Alex Lam S.L
2021-11-22 16:31:10 +00:00
committed by GitHub
parent 1e3ca4c6f7
commit 3ee1b0d00d
3 changed files with 65 additions and 22 deletions
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22
lib/compress.js
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@@ -703,6 +703,7 @@ merge(Compressor.prototype, {
if (depth > 1 && !(value && value.is_constant_expression(scope))) depth = 1;
if (!d.escaped.depth || d.escaped.depth > depth) d.escaped.depth = depth;
if (d.scope.resolve() !== scope.resolve()) d.escaped.cross_scope = true;
if (d.fixed) d.fixed.escaped = d.escaped;
return;
} else if (value_in_use(node, parent)) {
mark_escaped(tw, d, scope, parent, parent, level + 1, depth);
@@ -720,6 +721,7 @@ merge(Compressor.prototype, {
if (parent instanceof AST_SimpleStatement) return;
if (parent instanceof AST_Unary && !unary_side_effects[parent.operator]) return;
d.direct_access = true;
if (d.fixed) d.fixed.direct_access = true;
}
function mark_assignment_to_arguments(node) {
@@ -1000,9 +1002,9 @@ merge(Compressor.prototype, {
d.single_use = false;
}
tw.loop_ids[d.id] = tw.in_loop;
mark_escaped(tw, d, sym.scope, node, right, 0, 1);
sym.fixed = d.fixed = fixed;
sym.fixed.assigns = [ node ];
mark_escaped(tw, d, sym.scope, node, right, 0, 1);
}
});
}
@@ -7678,6 +7680,7 @@ merge(Compressor.prototype, {
right: prop.value,
}));
});
defs.value = node.right;
defs_by_id[node.left.definition().id] = defs;
self.body.splice(self.body.indexOf(this.stack[1]) + 1, 0, make_node(AST_Var, node, {
definitions: decls,
@@ -7690,12 +7693,16 @@ merge(Compressor.prototype, {
descend(node, this);
var defs = new Dictionary();
var var_defs = [];
var decl = node.clone();
decl.value = node.name instanceof AST_SymbolConst ? make_node(AST_Number, node, { value: 0 }) : null;
var_defs.push(decl);
node.value.properties.forEach(function(prop) {
var_defs.push(make_node(AST_VarDef, node, {
name: make_sym(node.name.CTOR, node.name, prop.key),
value: prop.value,
}));
});
defs.value = node.value;
defs_by_id[node.name.definition().id] = defs;
return List.splice(var_defs);
}
@@ -7711,6 +7718,7 @@ merge(Compressor.prototype, {
if (!(node.expression instanceof AST_SymbolRef)) return;
var defs = defs_by_id[node.expression.definition().id];
if (!defs) return;
if (node.expression.fixed_value() !== defs.value) return;
var def = defs.get(node.get_property());
var sym = make_node(AST_SymbolRef, node, {
name: def.name,
@@ -7721,7 +7729,9 @@ merge(Compressor.prototype, {
return sym;
}
if (node instanceof AST_SymbolRef) {
if (!(node.definition().id in defs_by_id)) return;
var defs = defs_by_id[node.definition().id];
if (!defs) return;
if (node.fixed_value() !== defs.value) return;
return make_node(AST_Object, node, { properties: [] });
}
}));
@@ -7730,18 +7740,16 @@ merge(Compressor.prototype, {
if (!(sym instanceof AST_Symbol)) return;
var def = sym.definition();
if (def.assignments != count) return;
if (def.direct_access) return;
if (def.escaped.depth == 1) return;
if (def.references.length - def.replaced == count) return;
if (def.single_use) return;
if (top_retain(def)) return;
if (sym.fixed_value() !== right) return;
var fixed = sym.fixed || def.fixed;
if (fixed.direct_access) return;
if (fixed.escaped && fixed.escaped.depth == 1) return;
return right instanceof AST_Object
&& right.properties.length > 0
&& all(right.properties, can_hoist_property)
&& all(def.references, function(ref) {
return ref.fixed_value() === right;
})
&& can_drop_symbol(sym, compressor);
}
});