gc: implement panic and recover
R=ken2, r, ken3
CC=golang-dev
https://golang.org/cl/831042
diff --git a/src/pkg/runtime/runtime.h b/src/pkg/runtime/runtime.h
index a0c0dd7..adb8311 100644
--- a/src/pkg/runtime/runtime.h
+++ b/src/pkg/runtime/runtime.h
@@ -62,6 +62,7 @@
typedef struct Eface Eface;
typedef struct Type Type;
typedef struct Defer Defer;
+typedef struct Panic Panic;
typedef struct hash Hmap;
typedef struct Hchan Hchan;
typedef struct Complex64 Complex64;
@@ -98,6 +99,7 @@
Gwaiting,
Gmoribund,
Gdead,
+ Grecovery,
};
enum
{
@@ -176,7 +178,8 @@
byte* stackguard; // cannot move - also known to linker, libmach, libcgo
byte* stackbase; // cannot move - also known to libmach, libcgo
Defer* defer;
- Gobuf sched; // cannot move - also known to libmach
+ Panic* panic;
+ Gobuf sched;
byte* stack0;
byte* entry; // initial function
G* alllink; // on allg
@@ -186,6 +189,7 @@
uint32 selgen; // valid sudog pointer
G* schedlink;
bool readyonstop;
+ bool ispanic;
M* m; // for debuggers, but offset not hard-coded
M* lockedm;
void (*cgofn)(void*); // for cgo/ffi
@@ -240,6 +244,7 @@
// function call, which uses an off-stack argument frame.
uint8* fp;
bool free; // call stackfree for this frame?
+ bool panic; // is this frame the top of a panic?
};
struct Alg
{
@@ -311,12 +316,24 @@
{
int32 siz;
byte* sp;
+ byte* pc;
byte* fn;
Defer* link;
byte args[8]; // padded to actual size
};
/*
+ * panics
+ */
+struct Panic
+{
+ Eface arg; // argument to panic
+ byte* stackbase; // g->stackbase in panic
+ Panic* link; // link to earlier panic
+ bool recovered; // whether this panic is over
+};
+
+/*
* external data
*/
extern Alg algarray[Amax];
@@ -400,6 +417,7 @@
void free(void *v);
void addfinalizer(void*, void(*fn)(void*), int32);
void walkfintab(void (*fn)(void*));
+void runpanic(Panic*);
void exit(int32);
void breakpoint(void);
