Merge pull request #710 from visualfc/sigsegv

[wip] runtime: signal SIGSEGV

c/signal/signal.go

@@ -0,0 +1,32 @@
+package signal
+
+import (
+	"unsafe"
+
+	"github.com/goplus/llgo/c"
+)
+import "C"
+
+const (
+	LLGoPackage = "link"
+)
+
+//llgo:type C
+type SignalHandler func(c.Int)
+
+//llgo:type C
+type sigactiont struct {
+	handler SignalHandler
+	tramp   unsafe.Pointer
+	mask    c.Int
+	flags   c.Int
+}
+
+//go:linkname sigaction C.sigaction
+func sigaction(sig c.Int, act, old *sigactiont) c.Int
+
+func Signal(sig c.Int, hanlder SignalHandler) c.Int {
+	var act sigactiont
+	act.handler = hanlder
+	return sigaction(sig, &act, nil)
+}

cl/_testgo/sigsegv/in.go

@@ -0,0 +1,24 @@
+package main
+
+type T struct {
+	s int
+}
+
+func f() *T {
+	return nil
+}
+
+func init() {
+	println("init")
+	defer func() {
+		r := recover()
+		if e, ok := r.(error); ok {
+			println("recover", e.Error())
+		}
+	}()
+	println(f().s)
+}
+
+func main() {
+	println("main")
+}

cl/_testgo/sigsegv/out.ll

@@ -0,0 +1 @@
+;

internal/runtime/z_rt.go

@@ -21,6 +21,8 @@ import (
 
 	"github.com/goplus/llgo/c"
 	"github.com/goplus/llgo/c/pthread"
+	"github.com/goplus/llgo/c/signal"
+	"github.com/goplus/llgo/c/syscall"
 )
 
 // -----------------------------------------------------------------------------
@@ -116,4 +118,16 @@ const MaxZero = 1024
 
 var ZeroVal [MaxZero]byte
 
+func init() {
+	signal.Signal(c.Int(syscall.SIGSEGV), func(v c.Int) {
+		switch syscall.Signal(v) {
+		case syscall.SIGSEGV:
+			panic(errorString("invalid memory address or nil pointer dereference"))
+		default:
+			var buf [20]byte
+			panic(errorString("unexpected signal value: " + string(itoa(buf[:], uint64(v)))))
+		}
+	})
+}
+
 // -----------------------------------------------------------------------------