{"record":{"id":"d8cb8745f577f3e0","repo":"MuntashirAkon/AppManager","slug":"parsererrors-syntax-errors-during-parsing-and-or-lexing","errorCode":null,"errorMessage":"{parserErrors} syntax errors during parsing and/or lexing.","messagePattern":"(.+?) syntax errors during parsing and/or lexing\\.","errorType":"exception","errorClass":"IOException","httpStatus":null,"severity":"error","filePath":"app/src/main/java/io/github/muntashirakon/AppManager/dex/DexUtils.java","lineNumber":124,"sourceCode":"            throws IOException, RecognitionException {\n        try (StringReader sr = new StringReader(smaliContents)) {\n            return toClassDef(sr, apiLevel);\n        }\n    }\n\n    @NonNull\n    public static ClassDef toClassDef(@NonNull Reader smaliReader, int apiLevel)\n            throws IOException, RecognitionException {\n        Opcodes opcodes = apiLevel < 0 ? Opcodes.getDefault() : Opcodes.forApi(apiLevel);\n        smaliFlexLexer lexer = new smaliFlexLexer(smaliReader, opcodes.api);\n        CommonTokenStream tokens = new CommonTokenStream(lexer);\n        smaliParser parser = new smaliParser(tokens);\n        parser.setVerboseErrors(false);\n        parser.setAllowOdex(false);\n        parser.setApiLevel(opcodes.api);\n        smaliParser.smali_file_return result = parser.smali_file();\n        if (parser.getNumberOfSyntaxErrors() > 0 || lexer.getNumberOfSyntaxErrors() > 0) {\n            throw new IOException((parser.getNumberOfSyntaxErrors() + lexer.getNumberOfSyntaxErrors())\n                    + \" syntax errors during parsing and/or lexing.\");\n        }\n\n        CommonTree t = result.getTree();\n        CommonTreeNodeStream treeStream = new CommonTreeNodeStream(t);\n        treeStream.setTokenStream(tokens);\n\n        DexBuilder dexBuilder = new DexBuilder(opcodes);\n        smaliTreeWalker dexGen = new smaliTreeWalker(treeStream);\n        dexGen.setApiLevel(opcodes.api);\n        dexGen.setVerboseErrors(false);\n        dexGen.setDexBuilder(dexBuilder);\n        ClassDef classDef = dexGen.smali_file();\n\n        if (dexGen.getNumberOfSyntaxErrors() > 0) {\n            throw new IOException(dexGen.getNumberOfSyntaxErrors() + \" syntax errors during dex creation\");\n        }\n","sourceCodeStart":106,"sourceCodeEnd":142,"githubUrl":"https://github.com/MuntashirAkon/AppManager/blob/0152f468fc9463ee02dc2ca83f6fe4989a2c4ca5/app/src/main/java/io/github/muntashirakon/AppManager/dex/DexUtils.java#L106-L142","documentation":"DexUtils.toClassDef() first disassembles the target DEX to smali, then re-parses the smali text with the smaliParser (ANTLR-based). If the lexer or parser reports any syntax errors, the method throws this IOException so the failure surfaces as a plain message instead of half-built output. It means the smali input itself is malformed — the parser could not turn the text back into a syntax tree.","triggerScenarios":"Calling DexUtils.toClassDef() with smali text that contains invalid opcodes/registers/directives, smali produced by a disassembler at a mismatched API level (parser.setApiLevel(opcodes.api)), odex-only syntax when setAllowOdex(false), or corrupted round-tripped smali files.","commonSituations":"Reassembling DEX files after editing smali by hand; disassembling an app built for a newer API level than the Opcodes used for parsing; feeding odex/quickened bytecode-derived smali into a dex path; merge tools mangling smali syntax.","solutions":["Check the reported error count and enable verbose parser errors (parser.setVerboseErrors(true)) or run smali/baksmali standalone to get line-level diagnostics, then fix the smali syntax at the reported lines","Match the API level: pass Opcodes for the correct API (or the APK's minSdk) so opcodes and directives are recognized","Ensure the smali came from a compatible disassembly (baksmali) and wasn't truncated or hand-edited with invalid registers/directives","If the input was odex, either enable odex support (setAllowOdex(true)) with deodex tools or de-odex the file before conversion"],"exampleFix":"// before\nsmaliParser parser = new smaliParser(tokens);\nparser.setVerboseErrors(false);\nparser.setApiLevel(opcodes.api);\nsmaliParser.smali_file_return result = parser.smali_file();\n// after\nsmaliParser parser = new smaliParser(tokens);\nparser.setVerboseErrors(true); // get line/column details on failure\nparser.setApiLevel(Opcodes.forApi(29)); // match the API the smali targets\nsmaliParser.smali_file_return result = parser.smali_file();","handlingStrategy":"try-catch","validationCode":"if (smali == null || smali.trim().isEmpty() || !smali.contains(\".class \")) throw new IllegalArgumentException(\"Invalid smali input\");","typeGuard":"boolean isPlausibleSmali(String s) { return s != null && s.contains(\".class \") && s.contains(\".super \"); }","tryCatchPattern":"try { ClassDef def = DexUtils.toClassDef(smali, opcodes, dexBuilder); } catch (IOException e) { if (e.getMessage().contains(\"syntax errors\")) { /* log smali source, fix syntax or report to user */ } else throw e; }","preventionTips":["Always generate smali with baksmali at the matching API level instead of hand-writing it","Enable verboseErrors(true) in diagnostics builds to capture line numbers","Pin Opcodes to the APK's target/min SDK API level","Run the standalone smali assembler in CI to catch syntax regressions"],"tags":["android","dex","smali","parsing"],"backgroundTag":"schema-validation-failed","analyzedSha":"0152f468fc9463ee02dc2ca83f6fe4989a2c4ca5","analyzedAt":"2026-09-12T14:03:37.243Z","contentChangedAt":"2026-09-12T14:03:37.243Z","schemaVersion":2},"datasetVersion":"2026-09-14T11:17:12.474Z"}