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avoid emitting try-block with no catch- & finally-blocks

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This commit is contained in:
alexlamsl 2017-03-30 02:17:29 +08:00
parent 2a2c6badd7
commit ff0c1116b6
3 changed files with 13 additions and 7 deletions
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5
lib/compress.js
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@ -2606,15 +2606,14 @@ merge(Compressor.prototype, {
OPT(AST_Try, function(self, compressor){ OPT(AST_Try, function(self, compressor){
self.body = tighten_body(self.body, compressor); self.body = tighten_body(self.body, compressor);
if (self.bcatch && all(self.bcatch.body, is_empty)) self.bcatch = null; if (self.bcatch && self.bfinally && all(self.bfinally.body, is_empty)) self.bfinally = null;
if (self.bfinally && all(self.bfinally.body, is_empty)) self.bfinally = null;
if (all(self.body, is_empty)) { if (all(self.body, is_empty)) {
var body = []; var body = [];
if (self.bcatch) extract_declarations_from_unreachable_code(compressor, self.bcatch, body); if (self.bcatch) extract_declarations_from_unreachable_code(compressor, self.bcatch, body);
if (self.bfinally) body = body.concat(self.bfinally.body); if (self.bfinally) body = body.concat(self.bfinally.body);
return body.length > 0 ? make_node(AST_BlockStatement, self, { return body.length > 0 ? make_node(AST_BlockStatement, self, {
body: body body: body
}) : make_node(AST_EmptyStatement, self); }).optimize(compressor) : make_node(AST_EmptyStatement, self);
} }
return self; return self;
}); });

10
test/compress/dead-code.js
View File

@ -234,7 +234,10 @@ try_catch_finally: {
console.log("PASS"); console.log("PASS");
} }
}(); }();
console.log(a); try {
console.log(a);
} finally {
}
} }
expect: { expect: {
var a = 1; var a = 1;
@ -243,7 +246,10 @@ try_catch_finally: {
a = 3; a = 3;
console.log("PASS"); console.log("PASS");
}(); }();
console.log(a); try {
console.log(a);
} finally {
}
} }
expect_stdout: [ expect_stdout: [
"PASS", "PASS",

5
test/compress/issue-1673.js
View File

@ -70,7 +70,7 @@ side_effects_finally: {
function f() { function f() {
function g() { function g() {
try { try {
if (f); x();
} catch (e) { } catch (e) {
} finally { } finally {
console.log("PASS"); console.log("PASS");
@ -84,7 +84,8 @@ side_effects_finally: {
function f() { function f() {
(function() { (function() {
try { try {
if (f); x();
} catch (e) {
} finally { } finally {
console.log("PASS"); console.log("PASS");
} }