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Merge branch 'master' into harmony-v3.0.20

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This commit is contained in:
alexlamsl
2017-06-25 16:02:46 +08:00
parent 49f3de8397 8b4dcd8f3e
commit 11afa816e3
25 changed files with 472 additions and 257 deletions
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76
lib/compress.js
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@@ -126,15 +126,13 @@ function Compressor(options, false_by_default) {
};
}
var toplevel = this.options["toplevel"];
if (typeof toplevel == "string") {
this.toplevel.funcs = /funcs/.test(toplevel);
this.toplevel.vars = /vars/.test(toplevel);
} else {
this.toplevel = toplevel ? function(def) {
return !def.export;
} : return_false;
this.toplevel.funcs = this.toplevel.vars = toplevel;
}
this.toplevel = typeof toplevel == "string" ? {
funcs: /funcs/.test(toplevel),
vars: /vars/.test(toplevel)
} : {
funcs: toplevel,
vars: toplevel
};
var sequences = this.options["sequences"];
this.sequences_limit = sequences == 1 ? 800 : sequences | 0;
this.warnings_produced = {};
@@ -143,12 +141,12 @@ function Compressor(options, false_by_default) {
Compressor.prototype = new TreeTransformer;
merge(Compressor.prototype, {
option: function(key) { return this.options[key] },
toplevel: function(def) {
if (def.export) return false;
for (var i = 0, len = def.orig.length; i < len; i++)
exposed: function(def) {
if (def.export) return true;
if (def.global) for (var i = 0, len = def.orig.length; i < len; i++)
if (!this.toplevel[def.orig[i] instanceof AST_SymbolDefun ? "funcs" : "vars"])
return false;
return true;
return true;
return false;
},
compress: function(node) {
if (this.option("expression")) {
@@ -284,11 +282,11 @@ merge(Compressor.prototype, {
var reduce_vars = rescan && compressor.option("reduce_vars");
var safe_ids = Object.create(null);
var suppressor = new TreeWalker(function(node) {
if (node instanceof AST_Symbol) {
var d = node.definition();
if (node instanceof AST_SymbolRef) d.references.push(node);
d.fixed = false;
}
if (!(node instanceof AST_Symbol)) return;
var d = node.definition();
if (!d) return;
if (node instanceof AST_SymbolRef) d.references.push(node);
d.fixed = false;
});
var tw = new TreeWalker(function(node, descend) {
node._squeezed = false;
@@ -356,7 +354,7 @@ merge(Compressor.prototype, {
}
if (node instanceof AST_Defun) {
var d = node.name.definition();
if (d.global && !compressor.toplevel(d) || safe_to_read(d)) {
if (compressor.exposed(d) || safe_to_read(d)) {
d.fixed = false;
} else {
d.fixed = node;
@@ -531,7 +529,7 @@ merge(Compressor.prototype, {
def.escaped = false;
if (def.scope.uses_eval) {
def.fixed = false;
} else if (!def.global || def.orig[0] instanceof AST_SymbolConst || compressor.toplevel(def)) {
} else if (def.orig[0] instanceof AST_SymbolConst || !compressor.exposed(def)) {
def.fixed = undefined;
} else {
def.fixed = false;
@@ -561,8 +559,25 @@ merge(Compressor.prototype, {
return fixed();
});
AST_SymbolRef.DEFMETHOD("is_immutable", function() {
var orig = this.definition().orig;
return orig.length == 1 && orig[0] instanceof AST_SymbolLambda;
});
function is_lhs_read_only(lhs) {
return lhs instanceof AST_SymbolRef && lhs.definition().orig[0] instanceof AST_SymbolLambda;
if (lhs instanceof AST_SymbolRef) return lhs.definition().orig[0] instanceof AST_SymbolLambda;
if (lhs instanceof AST_PropAccess) {
lhs = lhs.expression;
if (lhs instanceof AST_SymbolRef) {
if (lhs.is_immutable()) return false;
lhs = lhs.fixed_value();
}
if (!lhs) return true;
if (lhs instanceof AST_RegExp) return false;
if (lhs instanceof AST_Constant) return true;
return is_lhs_read_only(lhs);
}
return false;
}
function is_ref_of(ref, type) {
@@ -783,7 +798,7 @@ merge(Compressor.prototype, {
}
if (candidate instanceof AST_VarDef) {
var def = candidate.name.definition();
if (def.references.length == 1 && (!def.global || compressor.toplevel(def))) {
if (def.references.length == 1 && !compressor.exposed(def)) {
return maintain_this_binding(parent, node, candidate.value);
}
return make_node(AST_Assign, candidate, {
@@ -845,7 +860,7 @@ merge(Compressor.prototype, {
if (expr instanceof AST_VarDef && expr.name instanceof AST_SymbolDeclaration) {
var def = expr.name.definition();
if (def.orig.length > 1
|| def.references.length == 1 && (!def.global || compressor.toplevel(def))) {
|| def.references.length == 1 && !compressor.exposed(def)) {
return make_node(AST_SymbolRef, expr.name, expr.name);
}
} else {
@@ -1334,6 +1349,7 @@ merge(Compressor.prototype, {
def(AST_SymbolRef, function(pure_getters) {
if (this.is_undefined) return true;
if (!is_strict(pure_getters)) return false;
if (this.is_immutable()) return false;
var fixed = this.fixed_value();
return !fixed || fixed._throw_on_access(pure_getters);
});
@@ -3270,7 +3286,9 @@ merge(Compressor.prototype, {
var comp = new Compressor(compressor.options);
ast = ast.transform(comp);
ast.figure_out_scope(mangle);
ast.mangle_names();
base54.reset();
ast.compute_char_frequency(mangle);
ast.mangle_names(mangle);
var fun;
ast.walk(new TreeWalker(function(node) {
if (fun) return true;
@@ -3525,6 +3543,8 @@ merge(Compressor.prototype, {
|| cdr instanceof AST_PropAccess
|| cdr instanceof AST_Unary && !unary_side_effects(cdr.operator)) {
field = "expression";
} else if (cdr instanceof AST_Conditional) {
field = "condition";
} else {
expressions[++i] = expressions[j];
break;
@@ -4059,7 +4079,7 @@ merge(Compressor.prototype, {
var d = self.definition();
var fixed = self.fixed_value();
if (fixed instanceof AST_Defun) {
d.fixed = fixed = make_node(AST_Function, fixed, fixed).clone(true);
d.fixed = fixed = make_node(AST_Function, fixed, fixed);
}
if (compressor.option("unused")
&& fixed instanceof AST_Function
@@ -4067,7 +4087,7 @@ merge(Compressor.prototype, {
&& !(d.scope.uses_arguments && d.orig[0] instanceof AST_SymbolFunarg)
&& !d.scope.uses_eval
&& compressor.find_parent(AST_Scope) === fixed.parent_scope) {
return fixed;
return fixed.clone(true);
}
if (compressor.option("evaluate") && fixed) {
if (d.should_replace === undefined) {
@@ -4090,7 +4110,7 @@ merge(Compressor.prototype, {
}
var name_length = d.name.length;
var overhead = 0;
if (compressor.option("unused") && (!d.global || compressor.toplevel(d))) {
if (compressor.option("unused") && !compressor.exposed(d)) {
overhead = (name_length + 2 + value_length) / d.references.length;
}
d.should_replace = value_length <= name_length + overhead ? fn : false;