64 lines
3.3 KiB
C
64 lines
3.3 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/alg/arraylist.internal.h"
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#include "libc/assert.h"
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#include "libc/bits/bits.h"
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#include "libc/calls/calls.h"
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#include "libc/mem/mem.h"
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#include "libc/nexgen32e/gc.internal.h"
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#include "libc/runtime/gc.h"
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#include "libc/runtime/runtime.h"
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forceinline bool PointerNotOwnedByParentStackFrame(struct StackFrame *frame,
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struct StackFrame *parent,
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void *ptr) {
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return !(((intptr_t)ptr > (intptr_t)frame) &&
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((intptr_t)ptr < (intptr_t)parent));
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}
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/**
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* Adds destructor to garbage shadow stack.
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*
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* @param frame is passed automatically by wrapper macro
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* @param fn takes one argument
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* @param arg is passed to fn(arg)
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* @return arg
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*/
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void __defer(struct StackFrame *frame, void *fn, void *arg) {
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struct StackFrame *frame2;
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/*
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* To avoid an API requiring dlmalloc dependency, say:
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* defer(free_s, &ptr_not_owned_by_current_frame)
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* Rather than:
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* defer(weak(free), ptr)
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*/
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if (!arg) return;
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frame2 = __builtin_frame_address(0);
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assert(frame2->next == frame);
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assert(PointerNotOwnedByParentStackFrame(frame2, frame, arg));
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if (append(&__garbage,
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(&(const struct Garbage){frame->next, (intptr_t)fn, (intptr_t)arg,
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frame->addr})) != -1) {
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atomic_store(&frame->addr, (intptr_t)&__gc);
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} else {
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abort();
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}
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}
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