Cobhan FFI

Cobhan FFI is a proof of concept system for enabling shared code to be written in Rust or Go and consumed from all major languages/platforms in a safe and effective way, using easy helper functions to manage any unsafe data marshaling.

Types

• Supported types
  • int32 - 32bit signed integer
  • int64 - 64bit signed integer
  • float64 - double precision 64bit IEEE 754 floating point
  • Cobhan buffer - length delimited 8bit buffer (no null delimiters)
    • utf-8 encoded string
    • JSON
    • binary data
• Cobhan buffer details
  • Callers provide the output buffer allocation and capacity
  • Called functions can transparently return larger values via temporary files
  • Modern tmpfs is entirely memory backed
• Return values
  • Functions that return scalar values can return the value directly
    • Functions can use special case and return maximum positive or maximum negative or zero values to represent error or overflow conditions
    • Functions can allow scalar values to wrap
    • Functions should document their overflow / underflow behavior