19d4baed57
PR go/60406 runtime: Check callers in can_recover if return address doesn't match. Also use __builtin_extract_return_address and tighten up the checks in FFI code. Fixes PR 60406. From-SVN: r216003
86 lines
2.0 KiB
C
86 lines
2.0 KiB
C
/* go-defer.c -- manage the defer stack.
|
|
|
|
Copyright 2009 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. */
|
|
|
|
#include <stddef.h>
|
|
|
|
#include "runtime.h"
|
|
#include "go-alloc.h"
|
|
#include "go-panic.h"
|
|
#include "go-defer.h"
|
|
|
|
/* This function is called each time we need to defer a call. */
|
|
|
|
void
|
|
__go_defer (_Bool *frame, void (*pfn) (void *), void *arg)
|
|
{
|
|
G *g;
|
|
struct __go_defer_stack *n;
|
|
|
|
g = runtime_g ();
|
|
n = runtime_newdefer ();
|
|
n->__next = g->defer;
|
|
n->__frame = frame;
|
|
n->__panic = g->panic;
|
|
n->__pfn = pfn;
|
|
n->__arg = arg;
|
|
n->__retaddr = NULL;
|
|
n->__makefunc_can_recover = 0;
|
|
n->__special = 0;
|
|
g->defer = n;
|
|
}
|
|
|
|
/* This function is called when we want to undefer the stack. */
|
|
|
|
void
|
|
__go_undefer (_Bool *frame)
|
|
{
|
|
G *g;
|
|
|
|
g = runtime_g ();
|
|
while (g->defer != NULL && g->defer->__frame == frame)
|
|
{
|
|
struct __go_defer_stack *d;
|
|
void (*pfn) (void *);
|
|
|
|
d = g->defer;
|
|
pfn = d->__pfn;
|
|
d->__pfn = NULL;
|
|
|
|
if (pfn != NULL)
|
|
(*pfn) (d->__arg);
|
|
|
|
g->defer = d->__next;
|
|
|
|
/* This may be called by a cgo callback routine to defer the
|
|
call to syscall.CgocallBackDone, in which case we will not
|
|
have a memory context. Don't try to free anything in that
|
|
case--the GC will release it later. */
|
|
if (runtime_m () != NULL)
|
|
runtime_freedefer (d);
|
|
|
|
/* Since we are executing a defer function here, we know we are
|
|
returning from the calling function. If the calling
|
|
function, or one of its callees, paniced, then the defer
|
|
functions would be executed by __go_panic. */
|
|
*frame = 1;
|
|
}
|
|
}
|
|
|
|
/* This function is called to record the address to which the deferred
|
|
function returns. This may in turn be checked by __go_can_recover.
|
|
The frontend relies on this function returning false. */
|
|
|
|
_Bool
|
|
__go_set_defer_retaddr (void *retaddr)
|
|
{
|
|
G *g;
|
|
|
|
g = runtime_g ();
|
|
if (g->defer != NULL)
|
|
g->defer->__retaddr = __builtin_extract_return_addr (retaddr);
|
|
return 0;
|
|
}
|