runtime: copy signal code from Go 1.7 runtime

    
    Add a little shell script to auto-generate runtime.sigtable from the
    known signal names.
    
    Force the main package to always import the runtime package.  Otherwise
    some runtime package global variables may never be initialized.
    
    Set the syscallsp and syscallpc fields of g when entering a syscall, so
    that the runtime package knows when a g is executing a syscall.
    
    Fix runtime.funcPC to avoid dead store elimination of the interface
    value when the function is inlined.
    
    Reviewed-on: https://go-review.googlesource.com/33025

From-SVN: r242060

1 files changed, 98 insertions, 0 deletions

diff --git a/libgo/mksigtab.sh b/libgo/mksigtab.sh
new file mode 100644
index 00000000000..d33b7e2ff0b
--- /dev/null
+++ b/libgo/mksigtab.sh
@@ -0,0 +1,98 @@
+#!/bin/sh
+
+# Copyright 2016 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.
+
+# Create sigtab.go from gen-sysinfo.go.
+
+# This shell scripts creates the sigtab.go file, which maps signals to
+# their dispositions.  We generate a file so that we can build a
+# composite literal that only refers to signals that are defined on
+# this system.
+
+# This script simply writes to standard output.
+
+set -e
+
+echo '// Generated by mksigtab.sh.  Do not edit.'
+echo
+echo 'package runtime'
+echo
+echo 'var sigtable = [...]sigTabT{'
+
+# Handle signals valid on all Unix systems.
+
+echo '	0:          {0, "SIGNONE: no trap"},'
+echo '	_SIGHUP:    {_SigNotify + _SigKill, "SIGHUP: terminal line hangup"},'
+echo '	_SIGINT:    {_SigNotify + _SigKill, "SIGINT: interrupt"},'
+echo '	_SIGQUIT:   {_SigNotify + _SigThrow, "SIGQUIT: quit"},'
+echo '	_SIGILL:    {_SigThrow + _SigUnblock, "SIGILL: illegal instruction"},'
+echo '	_SIGTRAP:   {_SigThrow + _SigUnblock, "SIGTRAP: trace trap"},'
+echo '	_SIGABRT:   {_SigNotify + _SigThrow, "SIGABRT: abort"},'
+echo '	_SIGBUS:    {_SigPanic + _SigUnblock, "SIGBUS: bus error"},'
+echo '	_SIGFPE:    {_SigPanic + _SigUnblock, "SIGFPE: floating-point exception"},'
+echo '	_SIGKILL:   {0, "SIGKILL: kill"},'
+echo '	_SIGUSR1:   {_SigNotify, "SIGUSR1: user-defined signal 1"},'
+echo '	_SIGSEGV:   {_SigPanic + _SigUnblock, "SIGSEGV: segmentation violation"},'
+echo '	_SIGUSR2:   {_SigNotify, "SIGUSR2: user-defined signal 2"},'
+echo '	_SIGPIPE:   {_SigNotify, "SIGPIPE: write to broken pipe"},'
+echo '	_SIGALRM:   {_SigNotify, "SIGALRM: alarm clock"},'
+echo '	_SIGTERM:   {_SigNotify + _SigKill, "SIGTERM: termination"},'
+echo '	_SIGCHLD:   {_SigNotify + _SigUnblock, "SIGCHLD: child status has changed"},'
+echo '	_SIGCONT:   {_SigNotify + _SigDefault, "SIGCONT: continue"},'
+echo '	_SIGSTOP:   {0, "SIGSTOP: stop"},'
+echo '	_SIGTSTP:   {_SigNotify + _SigDefault, "SIGTSTP: keyboard stop"},'
+echo '	_SIGTTIN:   {_SigNotify + _SigDefault, "SIGTTIN: background read from tty"},'
+echo '	_SIGTTOU:   {_SigNotify + _SigDefault, "SIGTTOU: background write to tty"},'
+echo '	_SIGURG:    {_SigNotify, "SIGURG: urgent condition on socket"},'
+echo '	_SIGXCPU:   {_SigNotify, "SIGXCPU: cpu limit exceeded"},'
+echo '	_SIGXFSZ:   {_SigNotify, "SIGXFSZ: file size limit exceeded"},'
+echo '	_SIGVTALRM: {_SigNotify, "SIGVTALRM: virtual alarm clock"},'
+echo '	_SIGPROF:   {_SigNotify + _SigUnblock, "SIGPROF: profiling alarm clock"},'
+echo '	_SIGWINCH:  {_SigNotify, "SIGWINCH: window size change"},'
+echo '	_SIGSYS:    {_SigThrow, "SIGSYS: bad system call"},'
+
+# Handle signals that are not supported on all systems.
+
+checksig() {
+    if grep 'const $1 = ' gen-sysinfo.go >/dev/null 2>&1; then
+	echo "	$1: $2,"
+    fi
+}
+
+checksig _SIGSTKFLT ' {_SigThrow + _SigUnblock, "SIGSTKFLT: stack fault"}'
+checksig _SIGIO '     {_SigNotify, "SIGIO: i/o now possible"}'
+checksig _SIGPWR '    {_SigNotify, "SIGPWR: power failure restart"}'
+checksig _SIGEMT '    {_SigThrow, "SIGEMT: emulate instruction executed"}'
+checksig _SIGINFO '   {_SigNotify, "SIGINFO: status request from keyboard"}'
+checksig _SIGTHR '    {_SigNotify, "SIGTHR: reserved"}'
+checksig _SIGPOLL '   {_SigNotify, "SIGPOLL: pollable event occurred"}'
+checksig _SIGWAITING '{_SigNotify, "SIGWAITING: reserved signal no longer used by"}'
+checksig _SIGLWP '    {_SigNotify, "SIGLWP: reserved signal no longer used by"}'
+checksig _SIGFREEZE ' {_SigNotify, "SIGFREEZE: special signal used by CPR"}'
+checksig _SIGTHAW '   {_SigNotify, "SIGTHAW: special signal used by CPR"}'
+checksig _SIGCANCEL ' {_SigSetStack + _SigUnblock, "SIGCANCEL: reserved signal for thread cancellation"}'
+checksig _SIGXRES '   {_SigNotify, "SIGXRES: resource control exceeded"}'
+checksig _SIGJVM1 '   {_SigNotify, "SIGJVM1: reserved signal for Java Virtual Machine"}'
+checksig _SIGJVM2 '   {_SigNotify, "SIGJVM2: reserved signal for Java Virtual Machine"}'
+
+# Special handling of signals 32 and 33 on GNU/Linux systems,
+# because they are special to glibc.
+if test "${GOOS}" = "linux"; then
+    echo '	32: {_SigSetStack + _SigUnblock, "signal 32"}, /* SIGCANCEL; see issue 6997 */'
+    echo '	33: {_SigSetStack + _SigUnblock, "signal 33"}, /* SIGSETXID; see issues 3871, 9400, 12498 */'
+fi
+
+nsig=`grep 'const _*NSIG = [0-9]*$' gen-sysinfo.go | sed -e 's/.* = \([0-9]*\)/\1/'`
+i=1
+while test "$i" -lt "$nsig"; do
+    if ! grep "const _SIG.* = $i" gen-sysinfo.go >/dev/null 2>&1; then
+	if test "${GOOS}" != "linux" || test "$i" -ne 32 -a "$i" -ne 33; then
+	    echo "	$i: {_SigNotify, \"signal $i\"},"
+	fi
+    fi
+    i=`expr "$i" + 1`
+done
+
+echo '}'