Debugging

This part of the wiki collects all the information related to debugging GHC: that includes debugging the compiler itself, the libraries, the runtime system, the code generator, or the build system.

• Debugging the compiler itself. If you're debugging a compiler panic or some problem in GHC itself, then go to Debugging/Compiler

• Debugging a compiled program. If the compiled program crashes or panics, then go to Debugging/CompiledCode

• Performance debugging.
  • Debugging/TickyTicky: for debugging performance-related issues in compiled code. Typically for performance debugging of the Simplifier and Core-level optimisations.
  • Debugging/LowLevelProfiling: way to investigate low-level performance, typically for performance debugging of the code generator or RTS.

• Build failures. If you're trying to debug a build failure, then you probably want to look at
  • Building/Troubleshooting: Fixing common problems in a GHC build
  • Building/Modifying#Debugging: Debugging the build system