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fix corner cases related to AST_Hole (#3994)

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This commit is contained in:
Alex Lam S.L
2020-06-13 15:24:57 +01:00
committed by GitHub
parent 3188db7b90
commit 9e881407bd
3 changed files with 60 additions and 37 deletions
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16
lib/compress.js
View File

@@ -3369,9 +3369,10 @@ merge(Compressor.prototype, {
var elements = [];
for (var i = 0; i < this.elements.length; i++) {
var element = this.elements[i];
if (element instanceof AST_Hole) continue;
var value = element._eval(compressor, ignore_side_effects, cached, depth);
if (element === value) return this;
elements.push(value);
elements[i] = value;
}
return elements;
}
@@ -8446,7 +8447,8 @@ merge(Compressor.prototype, {
var elements = expr.elements;
var retValue = elements[index];
if (safe_to_flatten(retValue, compressor)) {
var flatten = true;
var is_hole = retValue instanceof AST_Hole;
var flatten = !is_hole;
var values = [];
for (var i = elements.length; --i > index;) {
var value = elements[i].drop_side_effect_free(compressor);
@@ -8455,12 +8457,16 @@ merge(Compressor.prototype, {
if (flatten && value.has_side_effects(compressor)) flatten = false;
}
}
retValue = retValue instanceof AST_Hole ? make_node(AST_Undefined, retValue) : retValue;
if (!flatten) values.unshift(retValue);
while (--i >= 0) {
var value = elements[i].drop_side_effect_free(compressor);
if (value) values.unshift(value);
else index--;
if (value) {
values.unshift(value);
} else if (is_hole) {
values.unshift(make_node(AST_Hole, elements[i]));
} else {
index--;
}
}
if (flatten) {
values.push(retValue);

61
test/compress/evaluate.js
View File

@@ -558,34 +558,45 @@ unsafe_array: {
unsafe: true,
}
input: {
console.log(
[1, , 3][1],
[1, 2, 3, a] + 1,
[1, 2, 3, 4] + 1,
[1, 2, 3, a][0] + 1,
[1, 2, 3, 4][0] + 1,
[1, 2, 3, 4][6 - 5] + 1,
[1, , 3, 4][6 - 5] + 1,
[[1, 2], [3, 4]][0] + 1,
[[1, 2], [3, 4]][6 - 5][1] + 1,
[[1, 2], , [3, 4]][6 - 5][1] + 1
);
var a = "PASS";
Array.prototype[1] = a;
console.log([1, , 3][1]);
console.log([1, 2, 3, a] + 1);
console.log([1, 2, 3, 4] + 1);
console.log([1, 2, 3, a][0] + 1);
console.log([1, 2, 3, 4][0] + 1);
console.log([1, 2, 3, 4][6 - 5] + 1);
console.log([1, , 3, 4][6 - 5] + 1);
console.log([[1, 2], [3, 4]][0] + 1);
console.log([[1, 2], [3, 4]][6 - 5][1] + 1);
console.log([[1, 2], , [3, 4]][6 - 5][1] + 1);
}
expect: {
console.log(
void 0,
[1, 2, 3, a] + 1,
"1,2,3,41",
[1, 2, 3, a][0] + 1,
2,
3,
NaN,
"1,21",
5,
(void 0)[1] + 1
);
var a = "PASS";
Array.prototype[1] = a;
console.log([1, , 3][1]);
console.log([1, 2, 3, a] + 1);
console.log("1,2,3,41");
console.log([1, 2, 3, a][0] + 1);
console.log(2);
console.log(3);
console.log([1, , 3, 4][1] + 1);
console.log("1,21");
console.log(5);
console.log([[1, 2], , [3, 4]][1][1] + 1);
}
expect_stdout: true
expect_stdout: [
"PASS",
"1,2,3,PASS1",
"1,2,3,41",
"2",
"2",
"3",
"PASS1",
"1,21",
"5",
"A1",
]
}
unsafe_string: {

20
test/compress/properties.js
View File

@@ -1046,16 +1046,22 @@ array_hole: {
side_effects: true,
}
input: {
console.log(
[ 1, 2, , 3][1],
[ 1, 2, , 3][2],
[ 1, 2, , 3][3]
);
Array.prototype[2] = "PASS";
console.log([ 1, 2, , 3 ][1]);
console.log([ 1, 2, , 3 ][2]);
console.log([ 1, 2, , 3 ][3]);
}
expect: {
console.log(2, void 0, 3);
Array.prototype[2] = "PASS";
console.log(2);
console.log([ , , , ][2]);
console.log(3);
}
expect_stdout: "2 undefined 3"
expect_stdout: [
"2",
"PASS",
"3",
]
}
new_this: {