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Merge remote-tracking branch 'refs/remotes/mishoo/master'

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This commit is contained in:
pborunda 2017-02-25 16:21:43 -07:00
commit 77042d50ba
6 changed files with 84 additions and 71 deletions
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46
lib/ast.js
View File

@ -145,12 +145,13 @@ var AST_SimpleStatement = DEFNODE("SimpleStatement", "body", {
}, AST_Statement);
function walk_body(node, visitor) {
if (node.body instanceof AST_Statement) {
node.body._walk(visitor);
var body = node.body;
if (body instanceof AST_Statement) {
body._walk(visitor);
}
else for (var i = 0, len = body.length; i < len; i++) {
body[i]._walk(visitor);
}
else node.body.forEach(function(stat){
stat._walk(visitor);
});
};
var AST_Block = DEFNODE("Block", "body", {
@ -371,9 +372,10 @@ var AST_Lambda = DEFNODE("Lambda", "name argnames uses_arguments", {
_walk: function(visitor) {
return visitor._visit(this, function(){
if (this.name) this.name._walk(visitor);
this.argnames.forEach(function(arg){
arg._walk(visitor);
});
var argnames = this.argnames;
for (var i = 0, len = argnames.length; i < len; i++) {
argnames[i]._walk(visitor);
}
walk_body(this, visitor);
});
}
@ -533,9 +535,10 @@ var AST_Definitions = DEFNODE("Definitions", "definitions", {
},
_walk: function(visitor) {
return visitor._visit(this, function(){
this.definitions.forEach(function(def){
def._walk(visitor);
});
var definitions = this.definitions;
for (var i = 0, len = definitions.length; i < len; i++) {
definitions[i]._walk(visitor);
}
});
}
}, AST_Statement);
@ -573,9 +576,10 @@ var AST_Call = DEFNODE("Call", "expression args", {
_walk: function(visitor) {
return visitor._visit(this, function(){
this.expression._walk(visitor);
this.args.forEach(function(arg){
arg._walk(visitor);
});
var args = this.args;
for (var i = 0, len = args.length; i < len; i++) {
args[i]._walk(visitor);
}
});
}
});
@ -742,9 +746,10 @@ var AST_Array = DEFNODE("Array", "elements", {
},
_walk: function(visitor) {
return visitor._visit(this, function(){
this.elements.forEach(function(el){
el._walk(visitor);
});
var elements = this.elements;
for (var i = 0, len = elements.length; i < len; i++) {
elements[i]._walk(visitor);
}
});
}
});
@ -756,9 +761,10 @@ var AST_Object = DEFNODE("Object", "properties", {
},
_walk: function(visitor) {
return visitor._visit(this, function(){
this.properties.forEach(function(prop){
prop._walk(visitor);
});
var properties = this.properties;
for (var i = 0, len = properties.length; i < len; i++) {
properties[i]._walk(visitor);
}
});
}
});

83
lib/compress.js
View File

@ -119,7 +119,7 @@ merge(Compressor.prototype, {
var passes = +this.options.passes || 1;
for (var pass = 0; pass < passes && pass < 3; ++pass) {
if (pass > 0 || this.option("reduce_vars"))
node.reset_opt_flags(this);
node.reset_opt_flags(this, true);
node = node.transform(this);
}
return node;
@ -178,28 +178,26 @@ merge(Compressor.prototype, {
return this.print_to_string() == node.print_to_string();
});
AST_Node.DEFMETHOD("reset_opt_flags", function(compressor){
var reduce_vars = compressor.option("reduce_vars");
AST_Node.DEFMETHOD("reset_opt_flags", function(compressor, rescan){
var reduce_vars = rescan && compressor.option("reduce_vars");
var unsafe = compressor.option("unsafe");
var tw = new TreeWalker(function(node){
if (reduce_vars && node instanceof AST_Scope) {
node.variables.each(function(def) {
delete def.modified;
});
}
if (node instanceof AST_SymbolRef) {
var d = node.definition();
if (d.init) {
delete d.init._evaluated;
if (reduce_vars) {
if (node instanceof AST_Toplevel) node.globals.each(reset_def);
if (node instanceof AST_Scope) node.variables.each(reset_def);
if (node instanceof AST_SymbolRef) {
var d = node.definition();
d.references.push(node);
if (!d.modified && (d.orig.length > 1 || isModified(node, 0))) {
d.modified = true;
}
}
if (reduce_vars && (d.orig.length > 1 || isModified(node, 0))) {
d.modified = true;
if (node instanceof AST_Call && node.expression instanceof AST_Function) {
node.expression.argnames.forEach(function(arg, i) {
arg.definition().init = node.args[i] || make_node(AST_Undefined, node);
});
}
}
if (reduce_vars && node instanceof AST_Call && node.expression instanceof AST_Function) {
node.expression.argnames.forEach(function(arg, i) {
arg.definition().init = node.args[i] || make_node(AST_Undefined, node);
});
}
if (!(node instanceof AST_Directive || node instanceof AST_Constant)) {
node._squeezed = false;
node._optimized = false;
@ -207,10 +205,18 @@ merge(Compressor.prototype, {
});
this.walk(tw);
function reset_def(def) {
def.modified = false;
def.references = [];
def.should_replace = undefined;
if (unsafe && def.init) {
def.init._evaluated = undefined;
}
}
function isModified(node, level) {
var parent = tw.parent(level);
if (parent instanceof AST_Unary && (parent.operator === "++" || parent.operator === "--")
|| parent instanceof AST_Assign && parent.left === node
if (isLHS(node, parent)
|| parent instanceof AST_Call && parent.expression === node) {
return true;
} else if (parent instanceof AST_PropAccess && parent.expression === node) {
@ -1255,7 +1261,7 @@ merge(Compressor.prototype, {
var d = this.definition();
if (compressor.option("reduce_vars") && !d.modified && d.init) {
if (compressor.option("unsafe")) {
if (!HOP(d.init, '_evaluated')) {
if (d.init._evaluated === undefined) {
d.init._evaluated = ev(d.init, compressor);
}
return d.init._evaluated;
@ -1906,7 +1912,7 @@ merge(Compressor.prototype, {
// returned if nothing changed.
function trim(nodes, compressor, first_in_statement) {
var ret = [], changed = false;
for (var i = 0, ii = nodes.length; i < ii; i++) {
for (var i = 0, len = nodes.length; i < len; i++) {
var node = nodes[i].drop_side_effect_free(compressor, first_in_statement);
changed |= node !== nodes[i];
if (node) {
@ -2404,9 +2410,6 @@ merge(Compressor.prototype, {
});
OPT(AST_Call, function(self, compressor){
self.args = self.args.map(function(arg) {
return arg.evaluate(compressor)[0];
});
if (compressor.option("unsafe")) {
var exp = self.expression;
if (exp instanceof AST_SymbolRef && exp.undeclared()) {
@ -3065,18 +3068,24 @@ merge(Compressor.prototype, {
return make_node(AST_Infinity, self).transform(compressor);
}
}
if (compressor.option("evaluate")
&& compressor.option("reduce_vars")
&& !isLHS(self, compressor.parent())) {
if (compressor.option("evaluate") && compressor.option("reduce_vars")) {
var d = self.definition();
if (d.constant && !d.modified && d.init && d.init.is_constant(compressor)) {
var original_as_string = self.print_to_string();
var const_node = make_node_from_constant(compressor, d.init.constant_value(compressor), self);
var const_node_as_string = const_node.print_to_string();
var per_const_overhead = d.global || !d.references.length ? 0
: (d.name.length + 2 + const_node_as_string.length) / d.references.length;
if (const_node_as_string.length <= original_as_string.length + per_const_overhead)
return const_node;
if (!d.modified && d.init) {
if (d.should_replace === undefined) {
var init = d.init.evaluate(compressor);
if (init.length > 1) {
var value = init[0].print_to_string().length;
var name = d.name.length;
var freq = d.references.length;
var overhead = d.global || !freq ? 0 : (name + 2 + value) / freq;
d.should_replace = value <= name + overhead ? init[0] : false;
} else {
d.should_replace = false;
}
}
if (d.should_replace) {
return d.should_replace;
}
}
}
return self;

2
lib/scope.js
View File

@ -51,7 +51,6 @@ function SymbolDef(scope, index, orig) {
this.global = false;
this.mangled_name = null;
this.undeclared = false;
this.constant = false;
this.index = index;
this.id = SymbolDef.next_id++;
};
@ -156,7 +155,6 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(options){
else if (node instanceof AST_SymbolVar
|| node instanceof AST_SymbolConst) {
var def = defun.def_variable(node);
def.constant = node instanceof AST_SymbolConst;
def.init = tw.parent().value;
}
else if (node instanceof AST_SymbolCatch) {

2
test/compress/evaluate.js
View File

@ -615,7 +615,7 @@ call_args: {
const a = 1;
console.log(1);
+function(a) {
return a;
return 1;
}(1);
}
}

16
test/compress/reduce_vars.js
View File

@ -134,8 +134,8 @@ modified: {
}
function f2() {
var b = 2, c = 3;
b = c;
var b = 2;
b = 3;
console.log(1 + b);
console.log(b + 3);
console.log(4);
@ -143,8 +143,8 @@ modified: {
}
function f3() {
var b = 2, c = 3;
b *= c;
var b = 2;
b *= 3;
console.log(1 + b);
console.log(b + 3);
console.log(4);
@ -236,7 +236,7 @@ unsafe_evaluate_object: {
function f0(){
var a = 1;
var b = {};
b[a] = 2;
b[1] = 2;
console.log(4);
}
@ -280,7 +280,7 @@ unsafe_evaluate_array: {
function f0(){
var a = 1;
var b = [];
b[a] = 2;
b[1] = 2;
console.log(4);
}
@ -373,8 +373,8 @@ passes: {
}
expect: {
function f() {
var b = 2, c = 3;
b = c;
var b = 2;
b = 3;
console.log(1 + b);
console.log(b + 3);
console.log(4);

6
test/mocha/comment_before_constant.js
View File

@ -7,7 +7,7 @@ describe("comment before constant", function() {
it("Should test comment before constant is retained and output after mangle.", function() {
var result = Uglify.minify(js, {
fromString: true,
compress: { collapse_vars: false },
compress: { collapse_vars: false, reduce_vars: false },
mangle: {},
output: { comments: true },
});
@ -17,9 +17,9 @@ describe("comment before constant", function() {
it("Should test code works when comments disabled.", function() {
var result = Uglify.minify(js, {
fromString: true,
compress: { collapse_vars: false },
compress: { collapse_vars: false, reduce_vars: false },
mangle: {},
output: {},
output: { comments: false },
});
assert.strictEqual(result.code, 'function f(){var n=!1;return n}');
});