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enhance evaluate, functions & inline (#3931)

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This commit is contained in:
Alex Lam S.L
2020-05-29 00:05:47 +01:00
committed by GitHub
parent d47ea77811
commit 6a5c63e1e3
4 changed files with 135 additions and 43 deletions
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98
lib/compress.js
View File

@@ -450,6 +450,11 @@ merge(Compressor.prototype, {
tw.safe_ids[def.id] = safe;
}
function push_ref(def, ref) {
def.references.push(ref);
def.last_ref = ref;
}
function add_assign(tw, def, node) {
if (def.fixed === false) return;
tw.assigns.add(def.id, node);
@@ -550,7 +555,7 @@ merge(Compressor.prototype, {
if (!(node instanceof AST_Symbol)) return;
var d = node.definition();
if (!d) return;
if (node instanceof AST_SymbolRef) d.references.push(node);
if (node instanceof AST_SymbolRef) push_ref(d, node);
d.fixed = false;
});
def(AST_Accessor, function(tw, descend, compressor) {
@@ -588,7 +593,7 @@ merge(Compressor.prototype, {
});
};
if (!safe) return;
d.references.push(sym);
push_ref(d, sym);
mark(tw, d, false);
node.right.walk(tw);
mark(tw, d, true);
@@ -784,7 +789,7 @@ merge(Compressor.prototype, {
def(AST_SymbolRef, function(tw, descend, compressor) {
if (this.fixed) delete this.fixed;
var d = this.definition();
d.references.push(this);
push_ref(d, this);
if (d.references.length == 1
&& !d.fixed
&& d.orig[0] instanceof AST_SymbolDefun) {
@@ -886,7 +891,7 @@ merge(Compressor.prototype, {
});
};
if (!safe) return;
d.references.push(exp);
push_ref(d, exp);
mark(tw, d, true);
add_assign(tw, d, node);
return true;
@@ -3280,12 +3285,30 @@ merge(Compressor.prototype, {
return this.value;
});
def(AST_Assign, function(compressor, ignore_side_effects, cached, depth) {
if (!ignore_side_effects) return this;
if (this.operator != "=") return this;
var node = this.right;
var lhs = this.left;
if (!ignore_side_effects) {
if (!(lhs instanceof AST_SymbolRef)) return this;
if (!HOP(lhs, "_eval") && !lhs.fixed) return this;
var def = lhs.definition();
if (def.undeclared) return this;
if (def.last_ref !== lhs) return this;
if (def.single_use == "m") return this;
}
var op = this.operator;
var node;
if (HOP(lhs, "_eval") || !lhs.fixed) {
node = op == "=" ? this.right : make_node(AST_Binary, this, {
operator: op.slice(0, -1),
left: lhs,
right: this.right,
});
} else {
node = lhs;
}
var value = node._eval(compressor, ignore_side_effects, cached, depth);
modified(this.left);
return value === node ? this : value;
if (value === node) return this;
modified(lhs);
return value;
});
def(AST_Sequence, function(compressor, ignore_side_effects, cached, depth) {
if (!ignore_side_effects) return this;
@@ -3377,8 +3400,7 @@ merge(Compressor.prototype, {
case "++":
case "--":
if (!(e instanceof AST_SymbolRef)) return this;
var refs = e.definition().references;
if (!ignore_side_effects && refs[refs.length - 1] !== e) return this;
if (!ignore_side_effects && e.definition().last_ref !== e) return this;
if (HOP(e, "_eval")) v = +(op[0] + 1) + +v;
modified(e);
return v;
@@ -3388,11 +3410,11 @@ merge(Compressor.prototype, {
def(AST_UnaryPostfix, function(compressor, ignore_side_effects, cached, depth) {
var e = this.expression;
if (!e.fixed) return this;
var refs = e.definition().references;
if (!ignore_side_effects && refs[refs.length - 1] !== e) return this;
if (!ignore_side_effects && e.definition().last_ref !== e) return this;
var v = e._eval(compressor, ignore_side_effects, cached, depth + 1);
if (v === e) return this;
modified(e);
return v === e ? this : +v;
return v;
});
var non_converting_binary = makePredicate("&& || === !==");
def(AST_Binary, function(compressor, ignore_side_effects, cached, depth) {
@@ -4385,13 +4407,11 @@ merge(Compressor.prototype, {
var defun = make_node(AST_Defun, def, def.value);
defun.name = make_node(AST_SymbolDefun, def.name, def.name);
var name_def = def.name.scope.resolve().def_function(defun.name);
if (old_def) def.value.walk(new TreeWalker(function(node) {
if (node instanceof AST_SymbolRef && node.definition() === old_def) {
node.name = name_def.name;
node.thedef = name_def;
node.reference({});
}
}));
if (old_def) old_def.references.forEach(function(node) {
node.name = name_def.name;
node.thedef = name_def;
node.reference({});
});
body.push(defun);
} else {
if (var_defs.length > 1 && sym.orig.indexOf(def.name) > sym.eliminated) {
@@ -6242,17 +6262,19 @@ merge(Compressor.prototype, {
&& !fn.uses_arguments
&& !fn.pinned()
&& !(fn.name && fn instanceof AST_Function)
&& (exp === fn
|| !recursive_ref(compressor, def = exp.definition()) && fn.is_constant_expression(exp.scope))
&& (exp === fn || !recursive_ref(compressor, def = exp.definition())
&& fn.is_constant_expression(compressor.find_parent(AST_Scope)))
&& (value = can_flatten_body(stat))
&& !fn.contains_this()) {
var replacing = exp === fn || compressor.option("unused") && def.references.length - def.replaced == 1;
if (can_substitute_directly()) {
var args = self.args.slice();
var refs = [];
args.push(value.clone(true).transform(new TreeTransformer(function(node) {
if (node instanceof AST_SymbolRef) {
var def = node.definition();
if (fn.variables.get(node.name) !== def) {
if (exp !== fn) def.references.push(node);
refs.push(node);
return node;
}
var index = resolve_index(def);
@@ -6267,11 +6289,17 @@ merge(Compressor.prototype, {
return arg;
})).optimize(compressor);
node = maintain_this_binding(compressor, compressor.parent(), compressor.self(), node);
if (best_of(compressor, self, node) === node) return node;
if (replacing || best_of(compressor, self, node) === node) {
refs.forEach(function(ref) {
var def = ref.definition();
def.references.push(ref);
if (replacing) def.replaced++;
});
return node;
}
}
var scope, in_loop, level = -1;
if ((exp === fn || compressor.option("unused") && def.references.length - def.replaced == 1)
&& can_inject_symbols()) {
if (replacing && can_inject_symbols()) {
fn._squeezed = true;
if (exp !== fn) fn.parent_scope = exp.scope;
var node = make_sequence(self, flatten_fn()).optimize(compressor);
@@ -6360,7 +6388,7 @@ merge(Compressor.prototype, {
var begin;
var in_order = [];
var side_effects = false;
value.walk(new TreeWalker(function(node) {
value.walk(new TreeWalker(function(node, descend) {
if (abort) return true;
if (node instanceof AST_Binary && lazy_op[node.operator]
|| node instanceof AST_Conditional) {
@@ -6386,7 +6414,11 @@ merge(Compressor.prototype, {
}
return;
}
if (node.has_side_effects(compressor)) side_effects = true;
if (node.has_side_effects(compressor)) {
descend();
side_effects = true;
return true;
}
}));
if (abort) return;
var end = self.args.length;
@@ -6395,8 +6427,8 @@ merge(Compressor.prototype, {
while (end-- > begin && fn.argnames[end] === in_order.pop());
end++;
}
var scope = side_effects && compressor.find_parent(AST_Scope);
return end <= begin || all(self.args.slice(begin, end), side_effects ? function(funarg) {
var scope = side_effects && !in_order && compressor.find_parent(AST_Scope);
return end <= begin || all(self.args.slice(begin, end), scope ? function(funarg) {
return funarg.is_constant_expression(scope);
} : function(funarg) {
return !funarg.has_side_effects(compressor);
@@ -6685,7 +6717,7 @@ merge(Compressor.prototype, {
var seq = lift_sequence_in_expression(self, compressor);
if (seq !== self) return seq.optimize(compressor);
}
return self;
return try_evaluate(compressor, self);
});
var SIGN_OPS = makePredicate("+ -");
@@ -7832,7 +7864,7 @@ merge(Compressor.prototype, {
expression: self.left
});
}
return self;
return try_evaluate(compressor, self);
function in_try(level, node) {
var right = self.right;

13
test/compress/collapse_vars.js
View File

@@ -62,7 +62,7 @@ collapse_vars_side_effects_1: {
expect: {
function f1() {
var s = "abcdef", i = 2;
console.log.bind(console)(s.charAt(i++), s.charAt(i++), s.charAt(i++), 7);
console.log.bind(console)(s.charAt(i++), s.charAt(i++), s.charAt(4), 7);
}
function f2() {
var s = "abcdef", i = 2;
@@ -74,13 +74,14 @@ collapse_vars_side_effects_1: {
log = console.log.bind(console),
x = s.charAt(i++),
y = s.charAt(i++);
log(x, s.charAt(i++), y, 7);
log(x, s.charAt(4), y, 7);
}
function f4() {
var i = 10,
x = i += 2,
y = i += 3;
console.log.bind(console)(x, i += 4, y, 19);
var i = 10;
i += 2,
i += 3,
i += 4;
console.log.bind(console)(12, 19, 15, 19);
}
f1(), f2(), f3(), f4();
}

59
test/compress/evaluate.js
View File

@@ -2485,3 +2485,62 @@ issue_3920: {
}
expect_stdout: "false"
}
inlined_increment_prefix: {
options = {
evaluate: true,
inline: true,
reduce_vars: true,
toplevel: true,
}
input: {
var a = 0;
(function() {
++a;
})();
console.log(a += 0);
}
expect: {
var a = 0;
void ++a;
console.log(a += 0);
}
expect_stdout: "1"
}
inlined_increment_postfix: {
options = {
evaluate: true,
inline: true,
reduce_vars: true,
toplevel: true,
}
input: {
var a = 0;
(function() {
a++;
})();
console.log(a += 0);
}
expect: {
var a = 0;
void a++;
console.log(a += 0);
}
expect_stdout: "1"
}
compound_assignment_to_property: {
options = {
evaluate: true,
unsafe: true,
}
input: {
1 + (0..p >>= 0) && console.log("PASS");
}
expect: {
1 + (0..p >>= 0),
console.log("PASS");
}
expect_stdout: "PASS"
}

8
test/compress/reduce_vars.js
View File

@@ -2724,8 +2724,8 @@ issue_1814_1: {
expect: {
!function() {
!function(a) {
console.log(a++, 42);
}(0);
console.log(0, 42);
}();
}();
}
expect_stdout: "0 42"
@@ -2751,8 +2751,8 @@ issue_1814_2: {
expect: {
!function() {
!function(a) {
console.log("321", a++);
}(0);
console.log("321", 0);
}();
}();
}
expect_stdout: "321 0"