compiler, runtime: Use function descriptors.

This changes the representation of a Go value of function type
from being a pointer to function code (like a C function
pointer) to being a pointer to a struct.  The first field of
the struct points to the function code.  The remaining fields,
if any, are the addresses of variables referenced in enclosing
functions.  For each call to a function, the address of the
function descriptor is passed as the last argument.

This lets us avoid generating trampolines, and removes the use
of writable/executable sections of the heap.

From-SVN: r200181

1 files changed, 1 insertions, 2 deletions

diff --git a/libgo/runtime/malloc.h b/libgo/runtime/malloc.h
index a820774..7ebb762 100644
--- a/libgo/runtime/malloc.h
+++ b/libgo/runtime/malloc.h
@@ -485,7 +485,7 @@ void	runtime_helpgc(int32 nproc);
 void	runtime_gchelper(void);
 
 struct __go_func_type;
-bool	runtime_getfinalizer(void *p, bool del, void (**fn)(void*), const struct __go_func_type **ft);
+bool	runtime_getfinalizer(void *p, bool del, FuncVal **fn, const struct __go_func_type **ft);
 void	runtime_walkfintab(void (*fn)(void*), void (*scan)(Obj));
 
 enum
@@ -505,4 +505,3 @@ void	runtime_gc_itab_ptr(Eface*);
 void	runtime_memorydump(void);
 
 void	runtime_time_scan(void (*)(Obj));
-void	runtime_trampoline_scan(void (*)(Obj));