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    Length: 6367 (0x18df)
    Types: TextFile
    Names: »interpret.h«

└─⟦a0efdde77⟧ Bits:30001252 EUUGD11 Tape, 1987 Spring Conference Helsinki
    └─⟦this⟧ »EUUGD11/gnu-31mar87/scheme/microcode/interpret.h« 

TextFile

/* Emacs, -*-C-*-an't you guess? */

/****************************************************************
*                                                               *
*                         Copyright (c) 1986                    *
*               Massachusetts Institute of Technology           *
*                                                               *
* This material was developed by the Scheme project at the      *
* Massachusetts Institute of Technology, Department of          *
* Electrical Engineering and Computer Science.  Permission to   *
* copy this software, to redistribute it, and to use it for any *
* purpose is granted, subject to the following restrictions and *
* understandings.                                               *
*                                                               *
* 1. Any copy made of this software must include this copyright *
* notice in full.                                               *
*                                                               *
* 2. Users of this software agree to make their best efforts (a)*
* to return to the MIT Scheme project any improvements or       *
* extensions that they make, so that these may be included in   *
* future releases; and (b) to inform MIT of noteworthy uses of  *
* this software.                                                *
*                                                               *
* 3.  All materials developed as a consequence of the use of    *
* this software shall duly acknowledge such use, in accordance  *
* with the usual standards of acknowledging credit in academic  *
* research.                                                     *
*                                                               *
* 4. MIT has made no warrantee or representation that the       *
* operation of this software will be error-free, and MIT is     *
* under no obligation to provide any services, by way of        *
* maintenance, update, or otherwise.                            *
*                                                               *
* 5.  In conjunction with products arising from the use of this *
* material, there shall be no use of the name of the            *
* Massachusetts Institute of Technology nor of any adaptation   *
* thereof in any advertising, promotional, or sales literature  *
* without prior written consent from MIT in each case.          *
*                                                               *
****************************************************************/
\f


/* File: INTERPRET.H
 *
 * Macros used by the interpreter but not expected for utilities.
 *
 */
\f


                     /********************/
                     /* OPEN CODED RACKS */
                     /********************/

#ifndef ENABLE_DEBUGGING_TOOLS
#ifdef In_Main_Interpreter
#define Using_Registers
#endif
#endif

#ifdef Using_Registers
#define Val		Reg_Val
#define Stack_Pointer	Reg_Stack_Pointer
#define Expression	Reg_Expression
#else
#define Val		Ext_Val
#define Stack_Pointer	Ext_Stack_Pointer
#define Expression	Ext_Expression
#endif

#define Stack_Check(P)	if ((P) <= Stack_Guard)			\
			{ if ((P) <= Free_Constant)		\
			    Microcode_Termination(TERM_STACK_OVERFLOW);	\
			  Request_GC();				\
			  User_Vector_Set(Fixed_Objects,Stack_Overflow,TRUTH);\
			}

#ifdef ENABLE_DEBUGGING_TOOLS
#define Will_Push(N)	{ Pointer *End_Stack;			\
			  End_Stack = Stack_Pointer - (N);	\
			  Stack_Check(End_Stack)
#define Pushed()	  if (Stack_Pointer < End_Stack)	\
			    Microcode_Termination(TERM_BAD_STACK);	\
			}
#else
#define Will_Push(N)	Stack_Check(Stack_Pointer - (N))
#define Pushed()	/* No op */
#endif

#define Push(P)		*--Stack_Pointer = (P)
#define Pop()		*Stack_Pointer++
#define Top_Of_Stack()	*Stack_Pointer
#define Pop_Frame()	Stack_Pointer += *Stack_Pointer+1
#define Pop_Primitive_Frame(NArgs)      Stack_Pointer += NArgs
/* Pop_Frame assumes that the environemnt length has type code 0 */

/* Racks operations continue on the next page */
\f


/* Rack operations, continued */

/* Fetch from register */

#define Fetch_Expression()	Expression
#define Fetch_Env()		Env
#define Fetch_Return()		Return

/* Store into register */

#define Store_Expression(P)	Expression = (P)
#define Store_Env(P)		Env = (P)
#define Store_Return(P)		Return = \
                                 Make_Non_Pointer(TC_RETURN_CODE, (P))

/* Save register on stack */
                                
#define Save_Cont()	{ Push(Expression);\
			  Push(Return);\
			  Cont_Print();\
			}

#define Cont_Print()	if (Cont_Debug)\
                          { Print_Return(CONT_PRINT_RETURN_MESSAGE);\
                            Print_Expression(Fetch_Expression(),\
			                     CONT_PRINT_EXPR_MESSAGE);\
                            CRLF();\
                          }\

/* Racks operations continue on the next page */
\f


/* Rack operations, continued */

#define Save_Env()		Push(Env)

/* Restore register from stack */

#define Restore_Cont()	{ Return = Pop();\
			  Expression = Pop();\
                          if (Cont_Debug)\
                          { Print_Return(RESTORE_CONT_RETURN_MESSAGE);\
                            Print_Expression(Fetch_Expression(),\
                                             RESTORE_CONT_EXPR_MESSAGE);\
                            CRLF();\
                          }\
                        }
#define Restore_Env()		Env = Pop()
#define Restore_Then_Save_Env()	Env = Top_Of_Stack()

/* Move from register to static storage and back */

#ifdef Using_Registers
#define Import_Val()		Reg_Val = Ext_Val

#define Import_Registers_Except_Val()	\
				{ Reg_Expression    = Ext_Expression;\
				  Reg_Stack_Pointer = Ext_Stack_Pointer;\
                                }

#define Import_Registers()	\
				{ Import_Registers_Except_Val();\
				  Import_Val();\
				}

#define Export_Registers()	{ Ext_Val           = Reg_Val;\
				  Ext_Expression    = Reg_Expression;\
				  Ext_Stack_Pointer = Reg_Stack_Pointer;\
                                }
#else
#define Import_Val()
#define Import_Registers()
#define Import_Registers_Except_Val()
#define Export_Registers()
#endif

#define Stop_Trapping()	\
	{ Trapping = false;\
          if (Return_Hook_Address != NULL)\
            *Return_Hook_Address = Old_Return_Code;\
          Return_Hook_Address = NULL;\
        }