diff options
Diffstat (limited to 'src/runtime/symtab.go')
| -rw-r--r-- | src/runtime/symtab.go | 49 |
1 files changed, 36 insertions, 13 deletions
diff --git a/src/runtime/symtab.go b/src/runtime/symtab.go index 7667f23f1d..00f802aaa7 100644 --- a/src/runtime/symtab.go +++ b/src/runtime/symtab.go @@ -308,30 +308,53 @@ type funcID uint8 const ( funcID_normal funcID = iota // not a special function - funcID_runtime_main + funcID_asmcgocall + funcID_asyncPreempt + funcID_cgocallback + funcID_debugCallV1 + funcID_externalthreadhandler + funcID_gcBgMarkWorker funcID_goexit + funcID_gogo + funcID_gopanic + funcID_handleAsyncEvent funcID_jmpdefer funcID_mcall funcID_morestack funcID_mstart + funcID_panicwrap funcID_rt0_go - funcID_asmcgocall - funcID_sigpanic funcID_runfinq - funcID_gcBgMarkWorker - funcID_systemstack_switch + funcID_runtime_main + funcID_sigpanic funcID_systemstack - funcID_cgocallback - funcID_gogo - funcID_externalthreadhandler - funcID_debugCallV1 - funcID_gopanic - funcID_panicwrap - funcID_handleAsyncEvent - funcID_asyncPreempt + funcID_systemstack_switch funcID_wrapper // any autogenerated code (hash/eq algorithms, method wrappers, etc.) ) +// A FuncFlag holds bits about a function. +// This list must match the list in cmd/internal/objabi/funcid.go. +type funcFlag uint8 + +const ( + // TOPFRAME indicates a function that appears at the top of its stack. + // The traceback routine stop at such a function and consider that a + // successful, complete traversal of the stack. + // Examples of TOPFRAME functions include goexit, which appears + // at the top of a user goroutine stack, and mstart, which appears + // at the top of a system goroutine stack. + funcFlag_TOPFRAME funcFlag = 1 << iota + + // SPWRITE indicates a function that writes an arbitrary value to SP + // (any write other than adding or subtracting a constant amount). + // The traceback routines cannot encode such changes into the + // pcsp tables, so the function traceback cannot safely unwind past + // SPWRITE functions. Stopping at an SPWRITE function is considered + // to be an incomplete unwinding of the stack. In certain contexts + // (in particular garbage collector stack scans) that is a fatal error. + funcFlag_SPWRITE +) + // pcHeader holds data used by the pclntab lookups. type pcHeader struct { magic uint32 // 0xFFFFFFFA |