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Merge branch 'master' into harmony-v3.3.6

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This commit is contained in:
alexlamsl
2018-01-13 13:53:31 +08:00
parent 1eb15f46f1 460218a3f8
commit 0f2be1456c
13 changed files with 636 additions and 164 deletions
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167
lib/compress.js
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@@ -489,8 +489,9 @@ merge(Compressor.prototype, {
if (node instanceof AST_SymbolRef) d.references.push(node);
d.fixed = false;
});
def(AST_Accessor, function(tw, descend) {
def(AST_Accessor, function(tw, descend, compressor) {
push(tw);
reset_variables(tw, compressor, this);
descend();
pop(tw);
return true;
@@ -947,6 +948,7 @@ merge(Compressor.prototype, {
}
function tighten_body(statements, compressor) {
var scope = compressor.find_parent(AST_Scope).get_defun_scope();
var CHANGED, max_iter = 10;
do {
CHANGED = false;
@@ -978,7 +980,6 @@ merge(Compressor.prototype, {
// Will not attempt to collapse assignments into or past code blocks
// which are not sequentially executed, e.g. loops and conditionals.
function collapse(statements, compressor) {
var scope = compressor.find_parent(AST_Scope).get_defun_scope();
if (scope.uses_eval || scope.uses_with) return statements;
var args;
var candidates = [];
@@ -1640,7 +1641,7 @@ merge(Compressor.prototype, {
function next_index(i) {
for (var j = i + 1, len = statements.length; j < len; j++) {
var stat = statements[j];
if (!(stat instanceof AST_Definitions && declarations_only(stat))) {
if (!(stat instanceof AST_Var && declarations_only(stat))) {
break;
}
}
@@ -1650,7 +1651,7 @@ merge(Compressor.prototype, {
function prev_index(i) {
for (var j = i; --j >= 0;) {
var stat = statements[j];
if (!(stat instanceof AST_Definitions && declarations_only(stat))) {
if (!(stat instanceof AST_Var && declarations_only(stat))) {
break;
}
}
@@ -1813,6 +1814,41 @@ merge(Compressor.prototype, {
statements.length = n;
}
function join_object_assignments(defn, body) {
if (!(defn instanceof AST_Definitions)) return;
var def = defn.definitions[defn.definitions.length - 1];
if (!(def.value instanceof AST_Object)) return;
var exprs;
if (body instanceof AST_Assign) {
exprs = [ body ];
} else if (body instanceof AST_Sequence) {
exprs = body.expressions.slice();
}
if (!exprs) return;
var trimmed = false;
do {
var node = exprs[0];
if (!(node instanceof AST_Assign)) break;
if (!(node.left instanceof AST_PropAccess)) break;
var sym = node.left.expression;
if (!(sym instanceof AST_SymbolRef)) break;
if (def.name.name != sym.name) break;
if (!node.right.is_constant_expression(scope)) break;
var prop = node.left.property;
if (prop instanceof AST_Node) {
prop = prop.evaluate(compressor);
}
if (prop instanceof AST_Node) break;
def.value.properties.push(make_node(AST_ObjectKeyVal, node, {
key: prop,
value: node.right
}));
exprs.shift();
trimmed = true;
} while (exprs.length);
return trimmed && exprs;
}
function join_consecutive_vars(statements, compressor) {
var defs;
for (var i = 0, j = -1, len = statements.length; i < len; i++) {
@@ -1845,6 +1881,14 @@ merge(Compressor.prototype, {
} else {
statements[++j] = stat;
}
} else if (stat instanceof AST_SimpleStatement) {
var exprs = join_object_assignments(prev, stat.body);
if (exprs) {
CHANGED = true;
if (!exprs.length) continue;
stat.body = make_sequence(stat.body, exprs);
}
statements[++j] = stat;
} else {
statements[++j] = stat;
}
@@ -2952,7 +2996,7 @@ merge(Compressor.prototype, {
var node_def = def.name.definition();;
initializations.add(node_def.id, def.value);
if (def.name.fixed_value() === def.value) {
fixed_ids[node_def.id] = true;
fixed_ids[node_def.id] = def;
}
}
if (def.value.has_side_effects(compressor)) {
@@ -2988,9 +3032,7 @@ merge(Compressor.prototype, {
var def = sym.definition();
var in_use = def.id in in_use_ids;
if (node instanceof AST_Assign) {
if (!in_use
|| def.id in fixed_ids
&& node.left.fixed_value() !== node.right) {
if (!in_use || def.id in fixed_ids && fixed_ids[def.id] !== node) {
return maintain_this_binding(parent, node, node.right.transform(tt));
}
} else if (!in_use) return make_node(AST_Number, node, {
@@ -3059,25 +3101,29 @@ merge(Compressor.prototype, {
var sym = def.name.definition();
if (drop_block && sym.global) return tail.push(def);
if (!(drop_vars || drop_block) || sym.id in in_use_ids) {
if (def.value && sym.id in fixed_ids && fixed_ids[sym.id] !== def) {
def.value = def.value.drop_side_effect_free(compressor);
}
if (def.name instanceof AST_SymbolVar) {
var var_defs = var_defs_by_id.get(sym.id);
if (var_defs.length > 1 && (!def.value || sym.orig.indexOf(def.name) > sym.eliminated)) {
compressor.warn("Dropping duplicated definition of variable {name} [{file}:{line},{col}]", template(def.name));
if (def.value) {
side_effects.push(make_node(AST_Assign, def, {
var assign = make_node(AST_Assign, def, {
operator: "=",
left: make_node(AST_SymbolRef, def.name, def.name),
right: def.value
}).transform(tt));
});
if (fixed_ids[sym.id] === def) {
fixed_ids[sym.id] = assign;
}
side_effects.push(assign.transform(tt));
}
remove(var_defs, def);
sym.eliminated++;
return;
}
}
if (def.value && sym.id in fixed_ids && def.name.fixed_value() !== def.value) {
def.value = def.value.drop_side_effect_free(compressor);
}
if (def.value) {
if (side_effects.length > 0) {
if (tail.length > 0) {
@@ -3196,7 +3242,7 @@ merge(Compressor.prototype, {
if (node instanceof AST_Assign) {
node.right.walk(tw);
if (node.left.fixed_value() === node.right) {
fixed_ids[node_def.id] = true;
fixed_ids[node_def.id] = node;
}
}
return true;
@@ -3648,23 +3694,28 @@ merge(Compressor.prototype, {
});
function if_break_in_loop(self, compressor) {
function drop_it(rest) {
rest = as_statement_array(rest);
if (self.body instanceof AST_BlockStatement) {
self.body = self.body.clone();
self.body.body = rest.concat(self.body.body.slice(1));
self.body = self.body.transform(compressor);
} else {
self.body = make_node(AST_BlockStatement, self.body, {
body: rest
}).transform(compressor);
}
if_break_in_loop(self, compressor);
}
var first = self.body instanceof AST_BlockStatement ? self.body.body[0] : self.body;
if (compressor.option("dead_code") && is_break(first)) {
var body = [];
if (self.init instanceof AST_Statement) {
body.push(self.init);
} else if (self.init) {
body.push(make_node(AST_SimpleStatement, self.init, {
body: self.init
}));
}
if (self.condition) {
body.push(make_node(AST_SimpleStatement, self.condition, {
body: self.condition
}));
}
extract_declarations_from_unreachable_code(compressor, self.body, body);
return make_node(AST_BlockStatement, self, {
body: body
});
}
if (first instanceof AST_If) {
if (first.body instanceof AST_Break
&& compressor.loopcontrol_target(first.body) === compressor.self()) {
if (is_break(first.body)) {
if (self.condition) {
self.condition = make_node(AST_Binary, self.condition, {
left: self.condition,
@@ -3675,9 +3726,7 @@ merge(Compressor.prototype, {
self.condition = first.condition.negate(compressor);
}
drop_it(first.alternative);
}
else if (first.alternative instanceof AST_Break
&& compressor.loopcontrol_target(first.alternative) === compressor.self()) {
} else if (is_break(first.alternative)) {
if (self.condition) {
self.condition = make_node(AST_Binary, self.condition, {
left: self.condition,
@@ -3690,7 +3739,27 @@ merge(Compressor.prototype, {
drop_it(first.body);
}
}
};
return self;
function is_break(node) {
return node instanceof AST_Break
&& compressor.loopcontrol_target(node) === compressor.self();
}
function drop_it(rest) {
rest = as_statement_array(rest);
if (self.body instanceof AST_BlockStatement) {
self.body = self.body.clone();
self.body.body = rest.concat(self.body.body.slice(1));
self.body = self.body.transform(compressor);
} else {
self.body = make_node(AST_BlockStatement, self.body, {
body: rest
}).transform(compressor);
}
self = if_break_in_loop(self, compressor);
}
}
OPT(AST_For, function(self, compressor){
if (!compressor.option("loops")) return self;
@@ -3726,8 +3795,7 @@ merge(Compressor.prototype, {
}
}
}
if_break_in_loop(self, compressor);
return self;
return if_break_in_loop(self, compressor);
});
OPT(AST_If, function(self, compressor){
@@ -3983,9 +4051,20 @@ merge(Compressor.prototype, {
OPT(AST_Try, function(self, compressor){
tighten_body(self.body, compressor);
if (self.bcatch && self.bfinally && all(self.bfinally.body, is_empty)) self.bfinally = null;
if (all(self.body, is_empty)) {
if (compressor.option("dead_code") && all(self.body, is_empty)) {
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);
body.forEach(function(stat) {
if (!(stat instanceof AST_Definitions)) return;
stat.definitions.forEach(function(var_def) {
var def = var_def.name.definition().redefined();
if (!def) return;
var_def.name = var_def.name.clone();
var_def.name.thedef = def;
});
});
}
if (self.bfinally) body = body.concat(self.bfinally.body);
return make_node(AST_BlockStatement, self, {
body: body
@@ -5576,6 +5655,20 @@ merge(Compressor.prototype, {
consequent
]).optimize(compressor);
}
// x ? y || z : z --> x && y || z
if (consequent instanceof AST_Binary
&& consequent.operator == "||"
&& consequent.right.equivalent_to(alternative)) {
return make_node(AST_Binary, self, {
operator: "||",
left: make_node(AST_Binary, self, {
operator: "&&",
left: self.condition,
right: consequent.left
}),
right: alternative
}).optimize(compressor);
}
var in_bool = compressor.in_boolean_context();
if (is_true(self.consequent)) {
if (is_false(self.alternative)) {