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/*
Title: machine_dep.h - exports signature for machine_dep.c
Copyright (c) 2000
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 _MACHINE_DEP_H
#define _MACHINE_DEP_H
#ifdef HAVE_SIGNAL_H
#include <signal.h>
#endif
#ifdef HAVE_UCONTEXT_H
#include <ucontext.h>
#endif
#ifdef HAVE_UCONTEXT_T
#define SIGNALCONTEXT ucontext_t
#elif defined(HAVE_STRUCT_SIGCONTEXT)
#define SIGNALCONTEXT struct sigcontext
#elif defined(HAVE_WINDOWS_H)
#include <windows.h>
#define SIGNALCONTEXT CONTEXT // This is the thread context.
#else
#define SIGNALCONTEXT void
#endif
class ScanAddress;
class TaskData;
class SaveVecEntry;
typedef SaveVecEntry *Handle;
class MDTaskData {
public:
virtual ~MDTaskData() {}
};
// Machine architecture values.
typedef enum {
MA_Interpreted = 0,
MA_I386,
MA_PPC,
MA_Sparc,
MA_X86_64
} Architectures;
// Machine-dependent module.
class MachineDependent {
public:
virtual ~MachineDependent() {} // Keep the compiler happy
// Create the machine-specific task data object.
virtual MDTaskData *CreateTaskData(void) = 0;
virtual unsigned InitialStackSize(void) { return 128; } // Initial size of a stack
// Must be > 40 (i.e. 2*min_stack_check) + base area in each stack frame
virtual void InitInterfaceVector(void) = 0;
virtual void ResetSignals(void) {}
/* ScanConstantsWithinCode - update addresses within a code segment.*/
virtual void ScanConstantsWithinCode(PolyObject *addr, PolyObject *oldAddr, POLYUNSIGNED length, ScanAddress *process) {}
void ScanConstantsWithinCode(PolyObject *addr, ScanAddress *process)
{ ScanConstantsWithinCode(addr, addr, addr->Length(), process); } // Common case
virtual int GetIOFunctionRegisterMask(int ioCall) = 0;
virtual void FlushInstructionCache(void *p, POLYUNSIGNED bytes) {}
virtual Architectures MachineArchitecture(void) = 0;
// This is machine-dependent but not always required. It is used in the code-generator.
virtual void SetCodeConstant(TaskData *taskData, Handle data, Handle constant, Handle offseth, Handle base) {}
virtual unsigned char *BuildCallback(TaskData *taskData, int cbEntryNo, Handle cResultType, int nArgsToRemove) { return 0; }
virtual void GetCallbackArg(void **args, void *argLoc, int nSize) {}
// Switch to Poly and return with the io function to call.
virtual int SwitchToPoly(TaskData *taskData) = 0;
virtual void SetForRetry(TaskData *taskData, int ioCall) = 0;
virtual void InterruptCode(TaskData *taskData) = 0;
virtual bool GetPCandSPFromContext(TaskData *taskData, SIGNALCONTEXT *context, PolyWord * &sp, POLYCODEPTR &pc) = 0;
// Initialise the stack for a new thread. Because this is called from the parent thread
// the task data object passed in is that of the parent.
virtual void InitStackFrame(TaskData *parentTaskData, Handle stack, Handle proc, Handle arg) = 0;
virtual void SetException(TaskData *taskData, poly_exn *exc) = 0;
// General RTS functions.
virtual void CallIO0(TaskData *taskData, Handle(*ioFun)(TaskData *)) = 0;
virtual void CallIO1(TaskData *taskData, Handle(*ioFun)(TaskData *, Handle)) = 0;
virtual void CallIO2(TaskData *taskData, Handle(*ioFun)(TaskData *, Handle, Handle)) = 0;
virtual void CallIO3(TaskData *taskData, Handle(*ioFun)(TaskData *, Handle, Handle, Handle)) = 0;
virtual void CallIO4(TaskData *taskData, Handle(*ioFun)(TaskData *, Handle, Handle, Handle, Handle)) = 0;
virtual void CallIO5(TaskData *taskData, Handle(*ioFun)(TaskData *, Handle, Handle, Handle, Handle, Handle)) = 0;
// These next two are sufficiently different that they need to be implemented
// as special cases.
virtual void SetExceptionTrace(TaskData *taskData) = 0;
virtual void CallCodeTupled(TaskData *taskData) = 0;
// This is used to get the argument to the callback_result function.
virtual Handle CallBackResult(TaskData *taskData) = 0;
// If a foreign function calls back to ML we need to set up the call to the
// ML callback function.
virtual void SetCallbackFunction(TaskData *taskData, Handle func, Handle args) {}
// Increment or decrement the first word of the object pointed to by the
// mutex argument and return the new value.
virtual Handle AtomicIncrement(TaskData *taskData, Handle mutexp);
virtual Handle AtomicDecrement(TaskData *taskData, Handle mutexp);
};
extern MachineDependent *machineDependent;
#endif /* _MACHINE_DEP_H */
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