GHC.Cmm.DebugBlock

Debug information about a block of code. Ticks scope over nested blocks.

Extract debug data from a group of procedures. We will prefer source notes that come from the given module (presumably the module that we are currently compiling).

Sets position and unwind table fields in the debug block tree according to native generated code.

Converts debug blocks into a label map for easier lookups

Maps registers to expressions that yield their "old" values further up the stack. Most interesting for the stack pointer Sp, but might be useful to document saved registers, too. Note that a register's value will be Nothing when the register's previous value cannot be reconstructed.

A label associated with an UnwindTable

Expressions, used for unwind information

Conversion of Cmm expressions to unwind expressions. We check for unsupported operator usages and simplify the expression as far as possible.