[Pkg-javascript-commits] [uglifyjs] 78/228: collapse assignment with adjacent subsequent usage (#1553)
Jonas Smedegaard
dr at jones.dk
Sat Apr 15 14:25:18 UTC 2017
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js pushed a commit to branch master
in repository uglifyjs.
commit 35a849dc48adf4a7318481f0ff540375ec0e43b2
Author: Alex Lam S.L <alexlamsl at gmail.com>
Date: Sun Mar 5 14:56:14 2017 +0800
collapse assignment with adjacent subsequent usage (#1553)
- consolidate `cascade` optimisations
- support ++/-- postfixes
- remove redundant optimisation identified in #1460
fixes #368
---
lib/compress.js | 43 +++++++++++++++++++++++++++----------------
test/compress/issue-368.js | 41 +++++++++++++++++++++++++++++++++++++++++
2 files changed, 68 insertions(+), 16 deletions(-)
diff --git a/lib/compress.js b/lib/compress.js
index 1a54c75..f1409d9 100644
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -607,10 +607,7 @@ merge(Compressor.prototype, {
return statements;
function is_lvalue(node, parent) {
- return node instanceof AST_SymbolRef && (
- (parent instanceof AST_Assign && node === parent.left)
- || (parent instanceof AST_Unary && parent.expression === node
- && (parent.operator == "++" || parent.operator == "--")));
+ return node instanceof AST_SymbolRef && isLHS(node, parent);
}
function replace_var(node, parent, is_constant) {
if (is_lvalue(node, parent)) return node;
@@ -1152,7 +1149,7 @@ merge(Compressor.prototype, {
});
function isLHS(node, parent) {
- return parent instanceof AST_Unary && (parent.operator === "++" || parent.operator === "--")
+ return parent instanceof AST_Unary && (parent.operator == "++" || parent.operator == "--")
|| parent instanceof AST_Assign && parent.left === node;
}
@@ -2832,21 +2829,35 @@ merge(Compressor.prototype, {
self.car = self.car.drop_side_effect_free(compressor, first_in_statement(compressor));
if (!self.car) return maintain_this_binding(compressor.parent(), self, self.cdr);
if (compressor.option("cascade")) {
+ var left;
if (self.car instanceof AST_Assign
&& !self.car.left.has_side_effects(compressor)) {
- if (self.car.left.equivalent_to(self.cdr)) {
- return self.car;
- }
- if (self.cdr instanceof AST_Call
- && self.cdr.expression.equivalent_to(self.car.left)) {
- self.cdr.expression = self.car;
- return self.cdr;
+ left = self.car.left;
+ } else if (self.car instanceof AST_UnaryPostfix
+ && (self.car.operator == "++" || self.car.operator == "--")) {
+ left = self.car.expression;
+ }
+ if (left) {
+ var parent, field;
+ var cdr = self.cdr;
+ while (true) {
+ if (cdr.equivalent_to(left)) {
+ if (parent) {
+ parent[field] = self.car;
+ return self.cdr;
+ }
+ return self.car;
+ }
+ if (cdr instanceof AST_Binary && !(cdr instanceof AST_Assign)) {
+ field = cdr.left.is_constant() ? "right" : "left";
+ } else if (cdr instanceof AST_Call
+ || cdr instanceof AST_Unary && cdr.operator != "++" && cdr.operator != "--") {
+ field = "expression";
+ } else break;
+ parent = cdr;
+ cdr = cdr[field];
}
}
- if (!self.car.has_side_effects(compressor)
- && self.car.equivalent_to(self.cdr)) {
- return self.car;
- }
}
if (is_undefined(self.cdr)) {
return make_node(AST_UnaryPrefix, self, {
diff --git a/test/compress/issue-368.js b/test/compress/issue-368.js
new file mode 100644
index 0000000..8c41a89
--- /dev/null
+++ b/test/compress/issue-368.js
@@ -0,0 +1,41 @@
+collapse: {
+ options = {
+ cascade: true,
+ sequences: true,
+ side_effects: true,
+ unused: true,
+ }
+ input: {
+ function f1() {
+ var a;
+ a = typeof b === 'function' ? b() : b;
+ return a !== undefined && c();
+ }
+ function f2(b) {
+ var a;
+ b = c();
+ a = typeof b === 'function' ? b() : b;
+ return 'stirng' == typeof a && d();
+ }
+ function f3(c) {
+ var a;
+ a = b(a / 2);
+ if (a < 0) {
+ c++;
+ return c / 2;
+ }
+ }
+ }
+ expect: {
+ function f1() {
+ return void 0 !== ('function' === typeof b ? b() : b) && c();
+ }
+ function f2(b) {
+ return b = c(), 'stirng' == typeof ('function' === typeof b ? b() : b) && d();
+ }
+ function f3(c) {
+ var a;
+ if ((a = b(a / 2)) < 0) return c++ / 2;
+ }
+ }
+}
--
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