[dev.cc] runtime: convert signal handlers from C to Go

This code overused macros and could not be
converted automatically. Instead a new sigctxt
type had to be defined for each os/arch combination,
with a common (implicit) interface used by the
arch-specific signal handler code.

[This CL is part of the removal of C code from package runtime.
See golang.org/s/dev.cc for an overview.]

LGTM=r
R=r
CC=austin, dvyukov, golang-codereviews, iant, khr
https://golang.org/cl/168500044

1 files changed, 45 insertions, 0 deletions

diff --git a/src/runtime/signal_darwin.go b/src/runtime/signal_darwin.go
new file mode 100644
index 0000000000..122648bc33
--- /dev/null
+++ b/src/runtime/signal_darwin.go
@@ -0,0 +1,45 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package runtime
+
+type sigTabT struct {
+	flags int32
+	name  string
+}
+
+var sigtable = [...]sigTabT{
+	/* 0 */ {0, "SIGNONE: no trap"},
+	/* 1 */ {_SigNotify + _SigKill, "SIGHUP: terminal line hangup"},
+	/* 2 */ {_SigNotify + _SigKill, "SIGINT: interrupt"},
+	/* 3 */ {_SigNotify + _SigThrow, "SIGQUIT: quit"},
+	/* 4 */ {_SigThrow, "SIGILL: illegal instruction"},
+	/* 5 */ {_SigThrow, "SIGTRAP: trace trap"},
+	/* 6 */ {_SigNotify + _SigThrow, "SIGABRT: abort"},
+	/* 7 */ {_SigThrow, "SIGEMT: emulate instruction executed"},
+	/* 8 */ {_SigPanic, "SIGFPE: floating-point exception"},
+	/* 9 */ {0, "SIGKILL: kill"},
+	/* 10 */ {_SigPanic, "SIGBUS: bus error"},
+	/* 11 */ {_SigPanic, "SIGSEGV: segmentation violation"},
+	/* 12 */ {_SigThrow, "SIGSYS: bad system call"},
+	/* 13 */ {_SigNotify, "SIGPIPE: write to broken pipe"},
+	/* 14 */ {_SigNotify, "SIGALRM: alarm clock"},
+	/* 15 */ {_SigNotify + _SigKill, "SIGTERM: termination"},
+	/* 16 */ {_SigNotify, "SIGURG: urgent condition on socket"},
+	/* 17 */ {0, "SIGSTOP: stop"},
+	/* 18 */ {_SigNotify + _SigDefault, "SIGTSTP: keyboard stop"},
+	/* 19 */ {0, "SIGCONT: continue after stop"},
+	/* 20 */ {_SigNotify, "SIGCHLD: child status has changed"},
+	/* 21 */ {_SigNotify + _SigDefault, "SIGTTIN: background read from tty"},
+	/* 22 */ {_SigNotify + _SigDefault, "SIGTTOU: background write to tty"},
+	/* 23 */ {_SigNotify, "SIGIO: i/o now possible"},
+	/* 24 */ {_SigNotify, "SIGXCPU: cpu limit exceeded"},
+	/* 25 */ {_SigNotify, "SIGXFSZ: file size limit exceeded"},
+	/* 26 */ {_SigNotify, "SIGVTALRM: virtual alarm clock"},
+	/* 27 */ {_SigNotify, "SIGPROF: profiling alarm clock"},
+	/* 28 */ {_SigNotify, "SIGWINCH: window size change"},
+	/* 29 */ {_SigNotify, "SIGINFO: status request from keyboard"},
+	/* 30 */ {_SigNotify, "SIGUSR1: user-defined signal 1"},
+	/* 31 */ {_SigNotify, "SIGUSR2: user-defined signal 2"},
+}