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/*
Title: run_time.h
Copyright (c) 2000-7
Cambridge University Technical Services Limited
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef _RUNTIME_H_DEFINED
#define _RUNTIME_H_DEFINED 1
#include "globals.h" // PolyWord, PolyObject etc
#include "noreturn.h"
class SaveVecEntry;
typedef SaveVecEntry *Handle;
class TaskData;
// Exceptions thrown by C++ code. Indicates that the caller should not return normally.
// They can be thrown in one of two different situations:
// 1. The IO function needs to raise an ML exception
// 2. The IO function needs to retry the call. There may have been a process switch.
enum EXCEPTION_REASON {
EXC_EXCEPTION,
EXC_RETRY
};
class IOException {
public:
IOException(enum EXCEPTION_REASON reason):
m_reason(reason)
{ }
enum EXCEPTION_REASON m_reason;
};
// This exception is used in the exporter and sharedata code. It is
// converted into an ML exception at the outer level.
class MemoryException {
public:
MemoryException() {}
};
// A request to kill the thread raises this exception.
class KillException {
public:
KillException() {}
};
/* storage allocation functions */
extern PolyObject *alloc(TaskData *taskData, POLYUNSIGNED words, unsigned flags = 0);
extern Handle alloc_and_save(TaskData *taskData, POLYUNSIGNED words, unsigned flags = 0);
extern Handle ex_tracec(TaskData *taskData, Handle exc_data, Handle handler_handle);
/* exceptions and interrupts */
NORETURNFN(extern void raise_exception(TaskData *taskData, int id, Handle arg));
NORETURNFN(extern void raise_exception0(TaskData *taskData, int id));
NORETURNFN(extern void raise_exception_string(TaskData *taskData, int id, const char *str));
NORETURNFN(extern void raise_syscall(TaskData *taskData, const char *errmsg, int err));
NORETURNFN(extern void raise_fail(TaskData *taskData, const char *errmsg));
Handle create_syscall_exception(TaskData *taskData, const char *errmsg, int err);
typedef void (*InterruptFunc)(int signum);
extern void register_interrupt_proc(InterruptFunc int_proc);
extern void re_init_run_time_system(void);
extern void init_run_time_system(void);
extern Handle EnterPolyCode(TaskData *taskData);
extern void give_stack_trace(TaskData *taskData, PolyWord *stackPtr, PolyWord *finish);
extern void uninit_run_time_system(void);
Handle make_exn(TaskData *taskData, int id, Handle arg);
extern bool trace_allowed;
extern void add_word_to_io_area(unsigned sysop, PolyWord val);
extern Handle CodeSegmentFlags(TaskData *taskData, Handle flags_handle, Handle addr_handle);
// Check to see that there is space in the stack. May GC and may raise a C++ exception.
extern void CheckAndGrowStack(TaskData *mdTaskData, PolyWord *lower_limit);
#endif /* _RUNTIME_H_DEFINED */
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