googleprojectzero / googleprojectzero/fuzzilli

Unhandled node type SwitchStatement

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Description

node parser.js ../../Protobuf/ast.proto code.js output.ast.proto

code.js:

switch (x) {};

Switch statements do not yet seem to be supported on rev d386a838.

<repo>/Sources/Fuzzilli/Compiler/Parser/parser.js:324
                throw "Unhandled node type " + node.type;
                ^
Unhandled node type SwitchStatement
Thrown at:
    at visitStatement (<repo>/Sources/Fuzzilli/Compiler/Parser/parser.js:324:17)
    at visitProgram (<repo>/Sources/Fuzzilli/Compiler/Parser/parser.js:51:37)
    at parse (<repo>/Sources/Fuzzilli/Compiler/Parser/parser.js:561:12)
    at <repo>/Sources/Fuzzilli/Compiler/Parser/parser.js:570:15
    at finish (<repo>/Sources/Fuzzilli/Compiler/Parser/node_modules/protobufjs/src/root.js:105:9)
    at process (<repo>/Sources/Fuzzilli/Compiler/Parser/node_modules/protobufjs/src/root.js:143:13)
    at <repo>/Sources/Fuzzilli/Compiler/Parser/node_modules/protobufjs/src/root.js:195:17
    at fetchReadFileCallback (<repo>/Sources/Fuzzilli/Compiler/Parser/node_modules/@protobufjs/fetch/index.js:51:19)
    at readFileAfterClose (node:internal/fs/read/context:68:3)

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First steps

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  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start with Sources/Fuzzilli/Compiler/Parser/parser.js, especially visitStatement at line 324, and reproduce the failure with the shown parser.js command and code.js input. Trace how nearby statement types are handled, then verify that a SwitchStatement no longer raises the unhandled-node error and that the generated output is accepted.

Written by the indexing model from the issue text.

Assessment

Tech stack
javascript, node.js
Domain
compilers
Issue type
Bug
Difficulty
3/5
Estimated time
1-2 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
45/100

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