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/*===========================================================================
* Filename : gcroots.c
* About : SigScheme-dependent portable implementation of libgcroots
*
* Copyright (C) 2006 YAMAMOTO Kengo <yamaken AT bp.iij4u.or.jp>
* Copyright (c) 2007 SigScheme Project <uim AT freedesktop.org>
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of authors nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS
* IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
===========================================================================*/
#include <config.h>
#if HAVE_GETCONTEXT
#include <ucontext.h>
#else
#include <setjmp.h>
#endif
#include "sigscheme.h"
#include "gcroots.h"
/*=======================================
File Local Macro Definitions
=======================================*/
/*=======================================
File Local Type Definitions
=======================================*/
struct _GCROOTS_context {
void *stack_base;
GCROOTS_mark_proc mark;
scm_bool scan_entire_system_stack;
};
/*=======================================
Variable Definitions
=======================================*/
/*=======================================
File Local Function Declarations
=======================================*/
static void mark_internal(GCROOTS_context *ctx);
/*=======================================
Function Definitions
=======================================*/
SCM_EXPORT GCROOTS_context *
GCROOTS_init(GCROOTS_context_alloc_proc allocator, GCROOTS_mark_proc marker,
int scan_entire_system_stack)
{
GCROOTS_context *ctx;
SCM_ASSERT(allocator);
SCM_ASSERT(marker);
/* scan_entire_system_stack is not supported by this implementation */
SCM_ASSERT(!scan_entire_system_stack);
ctx = (*allocator)(sizeof(GCROOTS_context));
if (ctx) {
ctx->mark = marker;
ctx->scan_entire_system_stack = scan_entire_system_stack;
ctx->stack_base = NULL;
}
return ctx;
}
SCM_EXPORT void
GCROOTS_fin(GCROOTS_context *ctx)
{
/* Nothing to do for this implementation. Caller must free ctx. */
}
SCM_EXPORT void *
GCROOTS_call_with_gc_ready_stack(GCROOTS_context *ctx,
GCROOTS_user_proc proc, void *arg)
{
void *ret;
void *stack_top; /* approx */
volatile GCROOTS_user_proc anti_inline_proc;
if (!ctx->stack_base)
ctx->stack_base = &stack_top;
anti_inline_proc = proc;
ret = (*anti_inline_proc)(arg);
if (ctx->stack_base == &stack_top)
ctx->stack_base = NULL;
return ret;
}
SCM_EXPORT void
GCROOTS_mark(GCROOTS_context *ctx)
{
#if HAVE_GETCONTEXT
ucontext_t uctx;
#else
jmp_buf env;
#endif
void (*volatile anti_inline_mark_internal)(GCROOTS_context *);
if (ctx->stack_base) {
#if HAVE_GETCONTEXT
getcontext(&uctx);
#else
setjmp(env);
#endif
anti_inline_mark_internal = mark_internal;
(*anti_inline_mark_internal)(ctx);
}
}
static void
mark_internal(GCROOTS_context *ctx)
{
void *stack_top; /* approx */
(*ctx->mark)(ctx->stack_base, &stack_top, scm_false, scm_false);
}
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