reverse-skills-max: initial public release (restored, redacted, hardened)

vendor-new/xbsReverseSkill/ast-deobfuscation/scripts/patterns/reese84-heavy-pass.js

@@ -0,0 +1,66 @@
+const { runPatternPass } = require("./shared-pattern-pass");
+const { inlineStringMethodCalls, traverse, t } = require("./pattern-utils");
+
+function pruneUnusedTopLevel(ast) {
+  let changed = false;
+
+  traverse(ast, {
+    Program(path) {
+      path.get("body").forEach((stmtPath) => {
+        if (stmtPath.isVariableDeclaration()) {
+          const removable = [];
+          stmtPath.get("declarations").forEach((declPath) => {
+            if (!declPath.get("id").isIdentifier()) {
+              return;
+            }
+            const binding = declPath.scope.getBinding(declPath.node.id.name);
+            if (binding && !binding.referenced) {
+              removable.push(declPath);
+            }
+          });
+          if (removable.length === stmtPath.node.declarations.length && removable.length > 0) {
+            stmtPath.remove();
+            changed = true;
+          } else if (removable.length > 0) {
+            removable.forEach((declPath) => declPath.remove());
+            changed = true;
+          }
+        } else if (stmtPath.isFunctionDeclaration() && stmtPath.node.id) {
+          const binding = stmtPath.scope.getBinding(stmtPath.node.id.name);
+          if (binding && !binding.referenced) {
+            stmtPath.remove();
+            changed = true;
+          }
+        }
+      });
+    }
+  });
+
+  return changed;
+}
+
+function reese84HeavyPass(ast) {
+  let changed = false;
+  if (inlineStringMethodCalls(ast)) {
+    changed = true;
+  }
+  traverse(ast, {
+    BinaryExpression: {
+      exit(path) {
+        if (path.get("left").isStringLiteral() && path.get("right").isStringLiteral()) {
+          const evaluated = path.evaluate();
+          if (evaluated.confident) {
+            path.replaceWith(t.valueToNode(evaluated.value));
+            changed = true;
+          }
+        }
+      }
+    }
+  });
+  if (pruneUnusedTopLevel(ast)) {
+    changed = true;
+  }
+  return { ast, changed };
+}
+
+runPatternPass(reese84HeavyPass);