{"record":{"id":"a7be505d44d8a9ad","repo":"skylot/jadx","slug":"error-generate-insn","errorCode":null,"errorMessage":"Error generate insn: ","messagePattern":"Error generate insn: ","errorType":"exception","errorClass":"CodegenException","httpStatus":null,"severity":"error","filePath":"jadx-core/src/main/java/jadx/core/codegen/InsnGen.java","lineNumber":310,"sourceCode":"\t\t\t\t\t\tcode.add(\"// \");\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t\tRegisterArg resArg = insn.getResult();\n\t\t\t\tif (resArg != null) {\n\t\t\t\t\tSSAVar var = resArg.getSVar();\n\t\t\t\t\tif (var == null || var.getUseCount() != 0 || insn.getType() != InsnType.CONSTRUCTOR) {\n\t\t\t\t\t\tassignVar(code, insn);\n\t\t\t\t\t\tcode.add(\" = \");\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t\tmakeInsnBody(code, insn, EMPTY_FLAGS);\n\t\t\t\tif (flag != Flags.INLINE) {\n\t\t\t\t\tcode.add(';');\n\t\t\t\t\tCodeGenUtils.addCodeComments(code, mth, insn);\n\t\t\t\t}\n\t\t\t}\n\t\t} catch (Exception e) {\n\t\t\tthrow new CodegenException(mth, \"Error generate insn: \" + insn, e);\n\t\t}\n\t}\n\n\tprivate void makeInsnBody(ICodeWriter code, InsnNode insn, Set<Flags> state) throws CodegenException {\n\t\tswitch (insn.getType()) {\n\t\t\tcase CONST_STR:\n\t\t\t\tString str = ((ConstStringNode) insn).getString();\n\t\t\t\tcode.add(mth.root().getStringUtils().unescapeString(str));\n\t\t\t\tbreak;\n\n\t\t\tcase CONST_CLASS:\n\t\t\t\tArgType clsType = ((ConstClassNode) insn).getClsType();\n\t\t\t\tuseType(code, clsType);\n\t\t\t\tcode.add(\".class\");\n\t\t\t\tbreak;\n\n\t\t\tcase CONST:\n\t\t\t\tLiteralArg arg = (LiteralArg) insn.getArg(0);","sourceCodeStart":292,"sourceCodeEnd":328,"githubUrl":"https://github.com/skylot/jadx/blob/e738a26571d02919f01df40de93bc9a44dee4e18/jadx-core/src/main/java/jadx/core/codegen/InsnGen.java#L292-L328","documentation":"Thrown by InsnGen.makeInsn() as a CodegenException wrapping any exception that occurs during instruction rendering (makeInsnBody, assignVar, addCodeComments, etc.). It annotates the exception with the method and the specific instruction that failed, making it the primary diagnostic entry point for instruction-level codegen failures. This exception is then caught higher up by ClassGen.addMethod() which may log it as a method error or escalate it.","triggerScenarios":"Any uncaught exception while generating code for a single instruction — null pointer on an unattached arg, unsupported instruction variant, type resolution failure, etc. The wrapped cause provides the specific failure.","commonSituations":"Obfuscated or unusual bytecode patterns that exercise untested codegen paths. jadx version regressions in instruction processing. Nearly every instruction-level codegen failure funnels through here.","solutions":["Check the cause exception of the CodegenException — it identifies the exact failure point.","Report the instruction and method to jadx with the stack trace.","Try fallback decompilation mode or skip the class."],"exampleFix":null,"handlingStrategy":"try-catch","validationCode":null,"typeGuard":null,"tryCatchPattern":"// This is already caught by ClassGen.addMethod(); to handle it at a higher level:\ntry {\n    insnGen.makeInsn(insn, code);\n} catch (CodegenException e) {\n    if (e.getMessage().startsWith(\"Error generate insn\")) {\n        mth.addError(\"Instruction generation failed: \" + insn, e.getCause());\n        code.startLine(\"// jadx: instruction generation failed: \" + insn.getType());\n        // Continue with next instruction instead of aborting the method\n    } else {\n        throw e;\n    }\n}","preventionTips":["Always inspect the cause of the CodegenException for the root failure.","Process at the method level so one bad instruction doesn't abort the entire class.","Report the instruction and method to jadx with the full cause chain."],"tags":["codegen","instruction","catch-all","decompiler-bug"],"backgroundTag":null,"analyzedSha":"e738a26571d02919f01df40de93bc9a44dee4e18","analyzedAt":"2026-08-14T00:10:24.238Z","schemaVersion":2},"datasetVersion":"2026-08-14T05:17:29.042Z"}