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support limited ufuzz testing for export (#4693)

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fixes #4692
This commit is contained in:
Alex Lam S.L
2021-02-26 20:56:34 +00:00
committed by GitHub
parent ac26993b5a
commit ba4a771bbc
7 changed files with 166 additions and 47 deletions
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10
lib/ast.js
View File

@@ -1176,15 +1176,7 @@ var AST_ExportDefault = DEFNODE("ExportDefault", "body", {
});
},
_validate: function() {
if (this.body instanceof AST_Class && this.body.name) {
if (!(this.body instanceof AST_DefClass)) {
throw new Error("body must be AST_DefClass when named");
}
} else if (this.body instanceof AST_Lambda && this.body.name) {
if (!(this.body instanceof AST_LambdaDefinition)) {
throw new Error("body must be AST_LambdaDefinition when named");
}
} else {
if (!(this.body instanceof AST_DefClass || this.body instanceof AST_LambdaDefinition)) {
must_be_expression(this, "body");
}
},

12
lib/compress.js
View File

@@ -940,6 +940,8 @@ merge(Compressor.prototype, {
});
if (!node.name) return;
var d = node.name.definition();
var parent = tw.parent();
if (parent instanceof AST_ExportDeclaration || parent instanceof AST_ExportDefault) d.single_use = false;
if (safe_to_assign(tw, d, true)) {
mark(tw, d);
tw.loop_ids[d.id] = tw.in_loop;
@@ -6709,6 +6711,7 @@ merge(Compressor.prototype, {
var var_decl = 0;
self.walk(new TreeWalker(function(node) {
if (var_decl > 1) return true;
if (node instanceof AST_ExportDeclaration) return true;
if (node instanceof AST_Scope && node !== self) return true;
if (node instanceof AST_Var) {
var_decl++;
@@ -6728,12 +6731,15 @@ merge(Compressor.prototype, {
dirs.push(node);
return make_node(AST_EmptyStatement, node);
}
if (hoist_funs && node instanceof AST_Defun
&& (tt.parent() === self || !compressor.has_directive("use strict"))) {
if (node instanceof AST_Defun) {
if (!hoist_funs) return node;
if (tt.parent() !== self && compressor.has_directive("use strict")) return node;
hoisted.push(node);
return make_node(AST_EmptyStatement, node);
}
if (hoist_vars && node instanceof AST_Var) {
if (node instanceof AST_Var) {
if (!hoist_vars) return node;
if (tt.parent() instanceof AST_ExportDeclaration) return node;
if (!all(node.definitions, function(defn) {
var sym = defn.name;
return sym instanceof AST_SymbolVar

19
lib/output.js
View File

@@ -664,7 +664,9 @@ function OutputStream(options) {
function needs_parens_function(output) {
if (!output.has_parens() && first_in_statement(output)) return true;
var p = output.parent();
// export default (function() {})()
// export default (function foo() {});
if (this.name && p instanceof AST_ExportDefault) return true;
// export default (function() {})(foo);
if (p && p.TYPE == "Call" && output.parent(1) instanceof AST_ExportDefault) return true;
if (output.option("webkit") && p instanceof AST_PropAccess && p.expression === this) return true;
if (output.option("wrap_iife") && p instanceof AST_Call && p.expression === this) return true;
@@ -725,6 +727,8 @@ function OutputStream(options) {
// { [(1, 2)]: foo } = bar
// { 1: (2, foo) } = bar
|| p instanceof AST_DestructuredKeyVal
// export default (foo, bar)
|| p instanceof AST_ExportDefault
// for (foo of (bar, baz));
|| p instanceof AST_ForOf
// { [(1, 2)]: 3 }[2] ---> 3
@@ -1032,9 +1036,16 @@ function OutputStream(options) {
output.space();
output.print("default");
output.space();
this.body.print(output);
if (this.body instanceof AST_Class) return;
if (this.body instanceof AST_Lambda && !is_arrow(this.body)) return;
var body = this.body;
body.print(output);
if (body instanceof AST_ClassExpression) {
if (!body.name) return;
}
if (body instanceof AST_DefClass) return;
if (body instanceof AST_LambdaDefinition) return;
if (body instanceof AST_LambdaExpression) {
if (!body.name && !is_arrow(body)) return;
}
output.semicolon();
});
DEFPRINT(AST_ExportForeign, function(output) {