v3.10.1

- fix related issues in `global_defs`, `ie8` & `reduce_vars`

lib/ast.js

@@ -120,6 +120,20 @@ var AST_Node = DEFNODE("Node", "start end", {
             ctor.prototype._validate.call(this);
         } while (ctor = ctor.BASE);
     },
+    validate_ast: function() {
+        var marker = {};
+        this.walk(new TreeWalker(function(node) {
+            if (node.validate_visited === marker) {
+                throw new Error(string_template("cannot reuse {type} from [{file}:{line},{col}]", {
+                    type: "AST_" + node.TYPE,
+                    file: node.start.file,
+                    line: node.start.line,
+                    col: node.start.col,
+                }));
+            }
+            node.validate_visited = marker;
+        }));
+    },
 }, null);
 
 (AST_Node.log_function = function(fn, verbose) {

lib/compress.js

@@ -587,7 +587,10 @@ merge(Compressor.prototype, {
             d.assignments++;
             var fixed = d.fixed;
             var value = eq ? node.right : node;
-            if (is_modified(compressor, tw, node, value, 0)) return;
+            if (is_modified(compressor, tw, node, value, 0)) {
+                d.fixed = false;
+                return;
+            }
             var safe = eq || safe_to_read(tw, d);
             node.right.walk(tw);
             if (safe && safe_to_assign(tw, d)) {
@@ -600,6 +603,7 @@ merge(Compressor.prototype, {
                         return node.right;
                     };
                 } else {
+                    if (d.single_use) d.single_use = false;
                     sym.fixed = d.fixed = function() {
                         return make_node(AST_Binary, node, {
                             operator: node.operator.slice(0, -1),
@@ -896,6 +900,7 @@ merge(Compressor.prototype, {
             if (safe_to_read(tw, d) && safe_to_assign(tw, d)) {
                 push_ref(d, exp);
                 mark(tw, d);
+                if (d.single_use) d.single_use = false;
                 d.fixed = function() {
                     return make_node(AST_Binary, node, {
                         operator: node.operator.slice(0, -1),
@@ -1197,7 +1202,9 @@ merge(Compressor.prototype, {
         function find_loop_scope_try() {
             var node = compressor.self(), level = 0;
             do {
-                if (node instanceof AST_Catch || node instanceof AST_Finally) {
+                if (node instanceof AST_Catch) {
+                    if (!compressor.parent(level).bfinally) level++;
+                } else if (node instanceof AST_Finally) {
                     level++;
                 } else if (node instanceof AST_IterationStatement) {
                     in_loop = true;
@@ -3065,7 +3072,7 @@ merge(Compressor.prototype, {
 
     (function(def) {
         function to_node(value, orig) {
-            if (value instanceof AST_Node) return make_node(value.CTOR, orig, value);
+            if (value instanceof AST_Node) return value.clone(true);
             if (Array.isArray(value)) return make_node(AST_Array, orig, {
                 elements: value.map(function(value) {
                     return to_node(value, orig);
@@ -4454,8 +4461,18 @@ merge(Compressor.prototype, {
                     var sym = def.name.definition();
                     if (!drop_vars || sym.id in in_use_ids) {
                         if (def.value && indexOf_assign(sym, def) < 0) {
-                            def.value = def.value.drop_side_effect_free(compressor);
-                            if (def.value) def.value.tail_node().write_only = false;
+                            var write_only = def.value.write_only;
+                            var value = def.value.drop_side_effect_free(compressor);
+                            if (def.value !== value) {
+                                def.value = value && make_sequence(def.value, [
+                                    value,
+                                    make_node(AST_Number, def.value, {
+                                        value: 0
+                                    }),
+                                ]);
+                            } else if (def.value.write_only !== write_only) {
+                                def.value.write_only = write_only;
+                            }
                         }
                         var old_def, var_defs = var_defs_by_id.get(sym.id);
                         if (!def.value) {
@@ -5063,6 +5080,7 @@ merge(Compressor.prototype, {
             }
         }));
         self.transform(new TreeTransformer(function(node, descend) {
+            if (node instanceof AST_Binary) return replace("right");
             if (node instanceof AST_PropAccess) {
                 if (!(node.expression instanceof AST_SymbolRef)) return;
                 var defs = defs_by_id[node.expression.definition().id];
@@ -5078,10 +5096,15 @@ merge(Compressor.prototype, {
             }
             if (node instanceof AST_Unary) {
                 if (unary_side_effects[node.operator]) return;
-                if (!(node.expression instanceof AST_SymbolRef)) return;
-                if (!(node.expression.definition().id in defs_by_id)) return;
+                return replace("expression");
+            }
+
+            function replace(prop) {
+                var sym = node[prop];
+                if (!(sym instanceof AST_SymbolRef)) return;
+                if (!(sym.definition().id in defs_by_id)) return;
                 var opt = node.clone();
-                opt.expression = make_node(AST_Object, node, {
+                opt[prop] = make_node(AST_Object, sym, {
                     properties: []
                 });
                 return opt;
@@ -5303,10 +5326,7 @@ merge(Compressor.prototype, {
             return make_sequence(this, [ expression, property ]);
         });
         def(AST_SymbolRef, function(compressor) {
-            if (!this.is_declared(compressor)) return this;
-            var def = this.definition();
-            if (member(this, def.references)) def.replaced++;
-            return null;
+            return this.is_declared(compressor) ? null : this;
         });
         def(AST_This, return_null);
         def(AST_Unary, function(compressor, first_in_statement) {
@@ -5314,10 +5334,7 @@ merge(Compressor.prototype, {
                 this.write_only = !this.expression.has_side_effects(compressor);
                 return this;
             }
-            if (this.operator == "typeof" && this.expression instanceof AST_SymbolRef) {
-                this.expression.definition().replaced++;
-                return null;
-            }
+            if (this.operator == "typeof" && this.expression instanceof AST_SymbolRef) return null;
             var expression = this.expression.drop_side_effect_free(compressor, first_in_statement);
             if (first_in_statement && expression && is_iife_call(expression)) {
                 if (expression === this.expression && this.operator == "!") return this;
@@ -6415,16 +6432,11 @@ merge(Compressor.prototype, {
 
         function return_value(stat) {
             if (!stat) return make_node(AST_Undefined, self);
-            if (stat instanceof AST_Return) {
-                if (!stat.value) return make_node(AST_Undefined, self);
-                return stat.value.clone(true);
-            }
-            if (stat instanceof AST_SimpleStatement) {
-                return make_node(AST_UnaryPrefix, stat, {
-                    operator: "void",
-                    expression: stat.body
-                });
-            }
+            if (stat instanceof AST_Return) return stat.value || make_node(AST_Undefined, self);
+            if (stat instanceof AST_SimpleStatement) return make_node(AST_UnaryPrefix, stat, {
+                operator: "void",
+                expression: stat.body
+            });
         }
 
         function can_flatten_body(stat) {
@@ -7630,6 +7642,8 @@ merge(Compressor.prototype, {
                         single_use = false;
                     } else if (recursive_ref(compressor, def)) {
                         single_use = false;
+                    } else if (compressor.option("ie8") && fixed.name && def !== fixed.name.definition()) {
+                        single_use = false;
                     } else if (def.scope !== self.scope || def.orig[0] instanceof AST_SymbolFunarg) {
                         single_use = fixed.is_constant_expression(self.scope);
                         if (single_use == "f") {
@@ -7638,8 +7652,6 @@ merge(Compressor.prototype, {
                                 scope.inlined = true;
                             } while (scope = scope.parent_scope);
                         }
-                    } else if (compressor.option("ie8") && fixed.name && def !== fixed.name.definition()) {
-                        single_use = false;
                     }
                     if (single_use) fixed.parent_scope = self.scope;
                 } else if (!fixed || !fixed.is_constant_expression()) {

lib/minify.js

@@ -178,13 +178,17 @@ function minify(files, options) {
             toplevel = toplevel[action](option);
             files[toplevel.start.file] = toplevel.print_to_string().replace(orig, "");
         });
+        if (options.validate) toplevel.validate_ast();
         if (timings) timings.rename = Date.now();
         if (options.rename) {
             toplevel.figure_out_scope(options.mangle);
             toplevel.expand_names(options.mangle);
         }
         if (timings) timings.compress = Date.now();
-        if (options.compress) toplevel = new Compressor(options.compress).compress(toplevel);
+        if (options.compress) {
+            toplevel = new Compressor(options.compress).compress(toplevel);
+            if (options.validate) toplevel.validate_ast();
+        }
         if (timings) timings.scope = Date.now();
         if (options.mangle) toplevel.figure_out_scope(options.mangle);
         if (timings) timings.mangle = Date.now();

lib/scope.js

@@ -230,6 +230,7 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(options) {
         } else {
             new_def = scope.def_variable(node);
         }
+        old_def.defun = new_def.scope;
         old_def.orig.concat(old_def.references).forEach(function(node) {
             node.thedef = new_def;
             node.reference(options);

package.json

@@ -3,7 +3,7 @@
   "description": "JavaScript parser, mangler/compressor and beautifier toolkit",
   "author": "Mihai Bazon <mihai.bazon@gmail.com> (http://lisperator.net/)",
   "license": "BSD-2-Clause",
-  "version": "3.10.0",
+  "version": "3.10.1",
   "engines": {
     "node": ">=0.8.0"
   },

test/compress.js

@@ -269,6 +269,7 @@ function test_case(test) {
         quote_style: 3,
     });
     try {
+        input.validate_ast();
         U.parse(input_code);
     } catch (ex) {
         log([
@@ -315,8 +316,8 @@ function test_case(test) {
             output = U.mangle_properties(output, test.mangle.properties);
         }
     }
-    output = make_code(output, output_options);
-    if (expect != output) {
+    var output_code = make_code(output, output_options);
+    if (expect != output_code) {
         log([
             "!!! failed",
             "---INPUT---",
@@ -329,14 +330,15 @@ function test_case(test) {
             "",
         ].join("\n"), {
             input: input_formatted,
-            output: output,
+            output: output_code,
             expected: expect
         });
         return false;
     }
     // expect == output
     try {
-        U.parse(output);
+        output.validate_ast();
+        U.parse(output_code);
     } catch (ex) {
         log([
             "!!! Test matched expected result but cannot parse output",
@@ -350,7 +352,7 @@ function test_case(test) {
             "",
         ].join("\n"), {
             input: input_formatted,
-            output: output,
+            output: output_code,
             error: ex,
         });
         return false;
@@ -409,7 +411,7 @@ function test_case(test) {
             });
             return false;
         }
-        actual = run_code(output, toplevel);
+        actual = run_code(output_code, toplevel);
         if (!sandbox.same_stdout(test.expect_stdout, actual)) {
             log([
                 "!!! failed",

test/compress/collapse_vars.js

@@ -8280,3 +8280,40 @@ issue_3976: {
     }
     expect_stdout: "PASS"
 }
+
+issue_4012: {
+    options = {
+        collapse_vars: true,
+        dead_code: true,
+        evaluate: true,
+    }
+    input: {
+        (function(a) {
+            try {
+                throw 2;
+            } catch (b) {
+                a = "PASS";
+                if (--b)
+                    return;
+                if (3);
+            } finally {
+                console.log(a);
+            }
+        })();
+    }
+    expect: {
+        (function(a) {
+            try {
+                throw 2;
+            } catch (b) {
+                a = "PASS";
+                if (--b)
+                    return;
+                if (3);
+            } finally {
+                console.log(a);
+            }
+        })();
+    }
+    expect_stdout: "PASS"
+}

test/compress/drop-unused.js

@@ -1729,7 +1729,7 @@ chained_3: {
     }
     expect: {
         console.log(function(a, b) {
-            var c = 2;
+            var c = b;
             b++;
             return c;
         }(0, 2));
@@ -2718,7 +2718,7 @@ issue_3962_1: {
                 0..toString();
             } while (0);
             if (c) console.log("PASS");
-        })((a--, 1));
+        }((a--, 1)), 0);
         void 0;
     }
     expect_stdout: "PASS"
@@ -2751,7 +2751,7 @@ issue_3962_2: {
                 0..toString();
             } while (0);
             if (c) console.log("PASS");
-        })((a--, 1));
+        }((a--, 1)), 0);
     }
     expect_stdout: "PASS"
 }
@@ -2789,3 +2789,62 @@ issue_3986: {
     }
     expect_stdout: "0"
 }
+
+issue_4017: {
+    options = {
+        pure_getters: "strict",
+        reduce_vars: true,
+        unused: true,
+    }
+    input: {
+        var a = 0;
+        console.log(function f() {
+            var b = c &= 0;
+            var c = a++ + (A = a);
+            var d = c && c[f];
+        }());
+    }
+    expect: {
+        var a = 0;
+        console.log(function() {
+            c &= 0;
+            var c = (a++, A = a, 0);
+        }());
+    }
+    expect_stdout: "undefined"
+}
+
+issue_4025: {
+    options = {
+        collapse_vars: true,
+        evaluate: true,
+        passes: 2,
+        reduce_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var a = 0, b = 0, c = 0, d = a++;
+        try {
+            var e = console.log(c), f = b;
+        } finally {
+            var d = b = 1, d = c + 1;
+            c = 0;
+        }
+        console.log(a, b, d);
+    }
+    expect: {
+        var d, c = 0;
+        try {
+            console.log(c);
+        } finally {
+            d = c + 1;
+            c = 0;
+        }
+        console.log(1, 1, d);
+    }
+    expect_stdout: [
+        "0",
+        "1 1 1",
+    ]
+}

test/compress/functions.js

@@ -4747,3 +4747,34 @@ issue_3929: {
     }
     expect_stdout: "function"
 }
+
+issue_4006: {
+    options = {
+        dead_code: true,
+        evaluate: true,
+        inline: true,
+        keep_fargs: "strict",
+        reduce_vars: true,
+        sequences: true,
+        side_effects: true,
+        unused: true,
+    }
+    input: {
+        var a = 0;
+        (function() {
+            (function(b, c) {
+                for (var k in console.log(c), 0)
+                    return b += 0;
+            })(0, --a);
+            return a ? 0 : --a;
+        })();
+    }
+    expect: {
+        var a = 0;
+        (function(c) {
+            for (var k in console.log(c), 0)
+                return;
+        })(--a), a || --a;
+    }
+    expect_stdout: "-1"
+}

test/compress/global_defs.js

@@ -12,6 +12,20 @@ must_replace: {
     }
 }
 
+repeated_nodes: {
+    options = {
+        global_defs: {
+            "@N": "rand()",
+        },
+    }
+    input: {
+        console.log(N, N);
+    }
+    expect: {
+        console.log(rand(), rand());
+    }
+}
+
 keyword: {
     options = {
         global_defs: {

test/compress/hoist_props.js

@@ -1016,3 +1016,28 @@ issue_3945_2: {
     }
     expect_stdout: "undefined"
 }
+
+issue_4023: {
+    options = {
+        comparisons: true,
+        hoist_props: true,
+        inline: true,
+        reduce_vars: true,
+        toplevel: true,
+        typeofs: true,
+        unused: true,
+    }
+    input: {
+        function f() {
+            var a = function() {
+                return { p: 0 };
+            }();
+            return console.log("undefined" != typeof a);
+        }
+        f();
+    }
+    expect: {
+        console.log(void 0 !== {});
+    }
+    expect_stdout: "true"
+}

test/compress/ie8.js

@@ -2544,12 +2544,12 @@ issue_3999: {
     expect: {
         (function() {
             (function f() {
-                for (var c = 0; c < 2; c++)
+                for (var o = 0; o < 2; o++)
                     try {
                         f[0];
                     } catch (f) {
                         var f = 0;
-                        console.log(c);
+                        console.log(o);
                     }
             })();
         })(typeof f);
@@ -2593,3 +2593,124 @@ issue_4001: {
     }
     expect_stdout: "undefined"
 }
+
+issue_4015: {
+    rename = true
+    mangle = {
+        ie8: true,
+        toplevel: true,
+    }
+    input: {
+        var n, a = 0, b;
+        function f() {
+            try {
+                throw 0;
+            } catch (b) {
+                (function g() {
+                    (function b() {
+                        a++;
+                    })();
+                })();
+            }
+        }
+        f();
+        console.log(a);
+    }
+    expect: {
+        var n, o = 0, c;
+        function t() {
+            try {
+                throw 0;
+            } catch (c) {
+                (function n() {
+                    (function c() {
+                        o++;
+                    })();
+                })();
+            }
+        }
+        t();
+        console.log(o);
+    }
+    expect_stdout: "1"
+}
+
+issue_4019: {
+    options = {
+        reduce_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    mangle = {
+        ie8: true,
+        toplevel: true,
+    }
+    input: {
+        var a = function() {
+            try {
+                console.log("FAIL");
+            } catch (b) {}
+        }, a = (console.log(a.length), ++a);
+    }
+    expect: {
+        var o = function() {
+            try {
+                console.log("FAIL");
+            } catch (o) {}
+        }, o = (console.log(o.length), ++o);
+    }
+    expect_stdout: "0"
+}
+
+issue_4028: {
+    options = {
+        reduce_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    mangle = {
+        ie8: true,
+    }
+    input: {
+        function a() {
+            try {
+                A;
+            } catch (e) {}
+        }
+        var b = a += a;
+        console.log(typeof b);
+    }
+    expect: {
+        function a() {
+            try {
+                A;
+            } catch (a) {}
+        }
+        var b = a += a;
+        console.log(typeof b);
+    }
+    expect_stdout: "string"
+}
+
+issue_2737: {
+    options = {
+        ie8: true,
+        reduce_vars: true,
+        unused: true,
+    }
+    input: {
+        (function(a) {
+            a();
+        })(function f() {
+            console.log(typeof f);
+        });
+    }
+    expect: {
+        (function(a) {
+            a();
+        })(function f() {
+            console.log(typeof f);
+        });
+    }
+    expect_stdout: "function"
+}

test/compress/reduce_vars.js

@@ -7383,3 +7383,26 @@ issue_3974: {
     }
     expect_stdout: "PASS"
 }
+
+issue_4030: {
+    options = {
+        collapse_vars: true,
+        evaluate: true,
+        reduce_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var a;
+        {
+            delete (a = "PASS");
+            A = "PASS";
+        }
+        console.log(A);
+    }
+    expect: {
+        A = "PASS";
+        console.log("PASS");
+    }
+    expect_stdout: "PASS"
+}

test/compress/side_effects.js

@@ -298,7 +298,7 @@ operator_in: {
     expect_stdout: "PASS"
 }
 
-issue_3983: {
+issue_3983_1: {
     options = {
         collapse_vars: true,
         conditionals: true,
@@ -323,7 +323,71 @@ issue_3983: {
     }
     expect: {
         var a = "PASS";
+        g();
+        function g() {}
         console.log(a);
     }
     expect_stdout: "PASS"
 }
+
+issue_3983_2: {
+    options = {
+        collapse_vars: true,
+        conditionals: true,
+        evaluate: true,
+        inline: true,
+        passes: 2,
+        reduce_vars: true,
+        side_effects: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var a = "PASS";
+        function f() {
+            g && g();
+        }
+        f();
+        function g() {
+            0 ? a : 0;
+        }
+        var b = a;
+        console.log(a);
+    }
+    expect: {
+        console.log("PASS");
+    }
+    expect_stdout: "PASS"
+}
+
+issue_4008: {
+    options = {
+        collapse_vars: true,
+        evaluate: true,
+        inline: true,
+        pure_getters: "strict",
+        reduce_vars: true,
+        side_effects: true,
+        toplevel: true,
+    }
+    input: {
+        var a = "PASS";
+        function f(b, b) {
+            console.log(b);
+        }
+        f && f(a && a[a]);
+        console.log(a);
+    }
+    expect: {
+        var a = "PASS";
+        function f(b, b) {
+            console.log(b);
+        }
+        f(a[a]);
+        console.log(a);
+    }
+    expect_stdout: [
+        "undefined",
+        "PASS",
+    ]
+}

test/ufuzz/index.js

@@ -197,6 +197,7 @@ BINARY_OPS = BINARY_OPS.concat(BINARY_OPS);
 BINARY_OPS = BINARY_OPS.concat(BINARY_OPS);
 BINARY_OPS = BINARY_OPS.concat(BINARY_OPS);
 BINARY_OPS = BINARY_OPS.concat(BINARY_OPS);
+BINARY_OPS = BINARY_OPS.concat(BINARY_OPS);
 BINARY_OPS.push(" in ");
 
 var ASSIGNMENTS = [
@@ -1136,18 +1137,6 @@ function log(options) {
         errorln(original_result);
         errorln("uglified result:");
         errorln(uglify_result);
-        errorln("//-------------------------------------------------------------");
-        var reduced = reduce_test(original_code, JSON.parse(options), {
-            verbose: false,
-        }).code;
-        if (reduced) {
-            errorln();
-            errorln("// reduced test case (output will differ)");
-            errorln();
-            errorln(reduced);
-            errorln();
-            errorln("//-------------------------------------------------------------");
-        }
     } else {
         errorln("// !!! uglify failed !!!");
         errorln(uglify_code);
@@ -1158,6 +1147,20 @@ function log(options) {
             errorln(original_result);
         }
     }
+    errorln("//-------------------------------------------------------------");
+    var reduce_options = JSON.parse(options);
+    reduce_options.validate = true;
+    var reduced = reduce_test(original_code, reduce_options, {
+        verbose: false,
+    }).code;
+    if (reduced) {
+        errorln();
+        errorln("// reduced test case (output will differ)");
+        errorln();
+        errorln(reduced);
+        errorln();
+        errorln("//-------------------------------------------------------------");
+    }
     errorln("minify(options):");
     errorln(JSON.stringify(JSON.parse(options), null, 2));
     errorln();
@@ -1231,7 +1234,7 @@ function patch_try_catch(orig, toplevel) {
             if (typeof result != "object" || typeof result.name != "string" || typeof result.message != "string") {
                 if (!stack.filled && match[1]) stack.push({
                     code: code,
-                    index: index,
+                    index: index && index - 1,
                     offset: offset,
                     tries: JSON.parse(JSON.stringify(tries)),
                 });