diff options
Diffstat (limited to 'src/runtime/panic.go')
| -rw-r--r-- | src/runtime/panic.go | 39 |
1 files changed, 32 insertions, 7 deletions
diff --git a/src/runtime/panic.go b/src/runtime/panic.go index e4cc7bfb31..2e6f7af2ce 100644 --- a/src/runtime/panic.go +++ b/src/runtime/panic.go @@ -986,6 +986,15 @@ func sync_throw(s string) { throw(s) } +//go:linkname sync_fatal sync.fatal +func sync_fatal(s string) { + fatal(s) +} + +// throw triggers a fatal error that dumps a stack trace and exits. +// +// throw should be used for runtime-internal fatal errors where Go itself, +// rather than user code, may be at fault for the failure. //go:nosplit func throw(s string) { // Everything throw does should be recursively nosplit so it @@ -993,12 +1002,23 @@ func throw(s string) { systemstack(func() { print("fatal error: ", s, "\n") }) - gp := getg() - if gp.m.throwing == 0 { - gp.m.throwing = 1 - } + + fatalthrow() +} + +// fatal triggers a fatal error that dumps a stack trace and exits. +// +// fatal is equivalent to throw, but is used when user code is expected to be +// at fault for the failure, such as racing map writes. +//go:nosplit +func fatal(s string) { + // Everything fatal does should be recursively nosplit so it + // can be called even when it's unsafe to grow the stack. + systemstack(func() { + print("fatal error: ", s, "\n") + }) + fatalthrow() - *(*int)(nil) = 0 // not reached } // runningPanicDefers is non-zero while running deferred functions for panic. @@ -1047,8 +1067,13 @@ func fatalthrow() { pc := getcallerpc() sp := getcallersp() gp := getg() - // Switch to the system stack to avoid any stack growth, which - // may make things worse if the runtime is in a bad state. + + if gp.m.throwing == 0 { + gp.m.throwing = 1 + } + + // Switch to the system stack to avoid any stack growth, which may make + // things worse if the runtime is in a bad state. systemstack(func() { startpanic_m() |