windows: implement exception handling
R=rsc, brainman
CC=golang-dev
https://golang.org/cl/4079041
diff --git a/src/pkg/runtime/proc.c b/src/pkg/runtime/proc.c
index 09c7a1d..5eb466e 100644
--- a/src/pkg/runtime/proc.c
+++ b/src/pkg/runtime/proc.c
@@ -733,6 +733,14 @@
*/
enum
{
+#ifdef __WINDOWS__
+ // need enough room in guard area for exception handler.
+ // use larger stacks to compensate for larger stack guard.
+ StackSmall = 256,
+ StackGuard = 2048,
+ StackBig = 8192,
+ StackExtra = StackGuard,
+#else
// byte offset of stack guard (g->stackguard) above bottom of stack.
StackGuard = 256,
@@ -745,6 +753,10 @@
// the frame is allocated) is assumed not to be much bigger
// than this amount. it may not be used efficiently if it is.
StackBig = 4096,
+
+ // extra room over frame size when allocating a stack.
+ StackExtra = 1024,
+#endif
};
void
@@ -812,7 +824,7 @@
framesize += argsize;
if(framesize < StackBig)
framesize = StackBig;
- framesize += 1024; // room for more functions, Stktop.
+ framesize += StackExtra; // room for more functions, Stktop.
stk = runtime·stackalloc(framesize);
top = (Stktop*)(stk+framesize-sizeof(*top));
free = true;
@@ -915,7 +927,7 @@
if(newg->stackguard - StackGuard != newg->stack0)
runtime·throw("invalid stack in newg");
} else {
- newg = runtime·malg(4096);
+ newg = runtime·malg(StackBig);
newg->status = Gwaiting;
newg->alllink = runtime·allg;
runtime·allg = newg;
