• Inphi's avatar
    cannon: Fix GC emulation of Go programs (#11704) · 7ff5e6ed
    Inphi authored
    * cannon: Fix GC emulation of Go programs
    
    Improves Linux/MIPS32 emulation for Go programs that utilize the garbage
    collector and goroutine scheduling.
    
    This adds support for the following syscalls:
    
    - getpid - used by the go scheduler
    - clock_gettime - used by the go scheduler and for GC assists and to properly emulate
      time related operations such as `time.Sleep`.
    
    Note on GC assists:
    
    The Go GC relies on `clock_gettime` for GC "assists", whereby a mutator can perform a little bit
    of GC without waiting for the scheduler to do so.
    A monotonic clock (runtime.nanotime) is used to compute the current goroutine's compute budget.
    By modeling a MIPS32 CPU that runs at some clock speed (ex: 10 MHz), we can provide a consistent
    emulation of monotonic time needed by the Go runtime.
    All other clock_gettime flags are handled as unimplemented syscalls.
    
    * fix unsupported syscalls test
    
    * fix some review comments
    
    * address review comments
    
    * update snapshots
    
    * fuzz invalid memory proof
    
    * reduce test runtime
    
    * tweak realtime emulation
    
    * reduce test runtime
    
    * set a high timeout for heavy fuzz tests
    
    * simplify fuzz
    
    * fix heavy tests
    7ff5e6ed
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