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/*
* tclExecute.h --
*
* This file contains the compiler-dependent macros that determine the
* instruction-threading method used by tclExecute.c
*
* See the file "license.terms" for information on usage and redistribution
* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
* RCS: @(#) $Id: tclExecute.h,v 1.1.2.2 2001/07/13 21:25:00 msofer Exp $
*/
/*
* An instruction-threading method has to define the following macros:
*
* . _CASE_DECLS declarations of special variables required
* . CHECK_OPCODES 0/1, if the opcodes have to be checked before RT
* . _CASE_START start of the block containing instructions
* . _CASE(instruction) the labelling method for instruction start
* . NEXT_INSTR the jump to the next instruction
* . _CASE_END end of the block containing instructions
*
*
* Currently three different methods are implemented:
*
* 1. SWITCH produces standard C code valid for any compiler;
* jumps from the end of an instruction to the switch
* statement, from there to the next instruction after
* performing a bounds check
* 2. GCC uses a gcc extension to jump directly from the end
* of an instruction to the start of the next one, using
* a jump table and the "labels as values" extension
* 3. MSVC directs msvc to omit checking the bounds of the switch
*/
#define SWITCH 0
#define GCC 1
#define MSVC 2
/*
* Choose the threading method according to the compiler being used; if
* TCL_BYTECODE_DEBUG is set, fallback to SWITCH for any compiler
*/
#ifdef __GNUC__
#define JUMP_version GCC
#elif defined( _MSC_VER ) && ( _MSC_VER >= 1200 ) && defined( _MSC_EXTENSIONS )
/* msvc with extensions */
#define JUMP_version MSVC
#else /* standard C output */
#define JUMP_version SWITCH
#endif /* choice of method */
#ifdef TCL_BYTECODE_DEBUG
# undef JUMP_version
# define JUMP_version SWITCH
# define INIT_TRACE_CHECK \
if (tclTraceExec == 3) {\
fprintf(stdout, "%2d: %2d ", iPtr->numLevels, tosPtr - eePtr->stackPtr);\
TclPrintInstruction(codePtr, pc);\
fflush(stdout);\
}
#else /* not debugging */
# define INIT_TRACE_CHECK
#endif /* debugging code */
/*
* Define the macros for the different threading methods
*/
/**** SWITCH ****/
#if JUMP_version == SWITCH
#define _CASE_DECLS
#define CHECK_OPCODES 0
# define _CASE_START \
instructions_start: \
INIT_TRACE_CHECK \
switch (*pc) {
#define _CASE(instruction) case instruction
#define NEXT_INSTR goto instructions_start
#define _CASE_END \
default: \
panic("TclExecuteByteCode: unrecognized opCode %u", *pc);\
} /* end of switch on opCode */
#endif /* SWITCH methods */
/**** MSVC ****/
#if JUMP_version == MSVC
#define _CASE_DECLS
#define CHECK_OPCODES 1
#define _CASE_START \
instructions_start: \
switch (*pc) {
#define _CASE(instruction) case instruction
#define NEXT_INSTR goto instructions_start
#define _CASE_END \
default: \
__assume(0); /* do not check bounds of switch! */ \
} /* end of switch on opCode */
#endif /* MSVC methods */
/**** GCC ****/
#if JUMP_version == GCC
#define _CASE_DECLS \
static const void *jumpTable[] = _JUMP_TABLE;
#define CHECK_OPCODES 1
#define _CASE_START NEXT_INSTR;
#define _CASE(instruction) _CASE_ ## instruction
#define NEXT_INSTR goto *jumpTable[*pc]
#define _CASE_END /* end of switch on opCode */
/* _CASE_DECLS uses the following jump table
* IT HAS TO BE IN THE CORRECT ORDER, of course */
#define _JUMP_TABLE {\
&&_CASE(INST_DONE),\
&&_CASE(INST_PUSH1),\
&&_CASE(INST_PUSH4),\
&&_CASE(INST_POP),\
&&_CASE(INST_DUP),\
&&_CASE(INST_CONCAT1),\
&&_CASE(INST_INVOKE_STK1),\
&&_CASE(INST_INVOKE_STK4),\
&&_CASE(INST_EVAL_STK),\
&&_CASE(INST_EXPR_STK),\
&&_CASE(INST_LOAD_SCALAR1),\
&&_CASE(INST_LOAD_SCALAR4),\
&&_CASE(INST_LOAD_SCALAR_STK),\
&&_CASE(INST_LOAD_ARRAY1),\
&&_CASE(INST_LOAD_ARRAY4),\
&&_CASE(INST_LOAD_ARRAY_STK),\
&&_CASE(INST_LOAD_STK),\
&&_CASE(INST_STORE_SCALAR1),\
&&_CASE(INST_STORE_SCALAR4),\
&&_CASE(INST_STORE_SCALAR_STK),\
&&_CASE(INST_STORE_ARRAY1),\
&&_CASE(INST_STORE_ARRAY4),\
&&_CASE(INST_STORE_ARRAY_STK),\
&&_CASE(INST_STORE_STK),\
&&_CASE(INST_INCR_SCALAR1),\
&&_CASE(INST_INCR_SCALAR_STK),\
&&_CASE(INST_INCR_ARRAY1),\
&&_CASE(INST_INCR_ARRAY_STK),\
&&_CASE(INST_INCR_STK),\
&&_CASE(INST_INCR_SCALAR1_IMM),\
&&_CASE(INST_INCR_SCALAR_STK_IMM),\
&&_CASE(INST_INCR_ARRAY1_IMM),\
&&_CASE(INST_INCR_ARRAY_STK_IMM),\
&&_CASE(INST_INCR_STK_IMM),\
&&_CASE(INST_JUMP1),\
&&_CASE(INST_JUMP4),\
&&_CASE(INST_JUMP_TRUE1),\
&&_CASE(INST_JUMP_TRUE4),\
&&_CASE(INST_JUMP_FALSE1),\
&&_CASE(INST_JUMP_FALSE4),\
&&_CASE(INST_LOR),\
&&_CASE(INST_LAND),\
&&_CASE(INST_BITOR),\
&&_CASE(INST_BITXOR),\
&&_CASE(INST_BITAND),\
&&_CASE(INST_EQ),\
&&_CASE(INST_NEQ),\
&&_CASE(INST_LT),\
&&_CASE(INST_GT),\
&&_CASE(INST_LE),\
&&_CASE(INST_GE),\
&&_CASE(INST_LSHIFT),\
&&_CASE(INST_RSHIFT),\
&&_CASE(INST_ADD),\
&&_CASE(INST_SUB),\
&&_CASE(INST_MULT),\
&&_CASE(INST_DIV),\
&&_CASE(INST_MOD),\
&&_CASE(INST_UPLUS),\
&&_CASE(INST_UMINUS),\
&&_CASE(INST_BITNOT),\
&&_CASE(INST_LNOT),\
&&_CASE(INST_CALL_BUILTIN_FUNC1),\
&&_CASE(INST_CALL_FUNC1),\
&&_CASE(INST_TRY_CVT_TO_NUMERIC),\
&&_CASE(INST_BREAK),\
&&_CASE(INST_CONTINUE),\
&&_CASE(INST_FOREACH_START4),\
&&_CASE(INST_FOREACH_STEP4),\
&&_CASE(INST_BEGIN_CATCH4),\
&&_CASE(INST_END_CATCH),\
&&_CASE(INST_PUSH_RESULT),\
&&_CASE(INST_PUSH_RETURN_CODE),\
&&_CASE(INST_STR_EQ),\
&&_CASE(INST_STR_NEQ),\
&&_CASE(INST_STR_CMP),\
&&_CASE(INST_STR_LEN),\
&&_CASE(INST_STR_INDEX),\
&&_CASE(INST_STR_MATCH),\
&&_CASE(INST_LIST),\
&&_CASE(INST_LIST_INDEX),\
&&_CASE(INST_LIST_LENGTH),\
&&_CASE(INST_APPEND_SCALAR1),\
&&_CASE(INST_APPEND_SCALAR4),\
&&_CASE(INST_APPEND_ARRAY1),\
&&_CASE(INST_APPEND_ARRAY4),\
&&_CASE(INST_APPEND_ARRAY_STK),\
&&_CASE(INST_APPEND_STK),\
&&_CASE(INST_LAPPEND_SCALAR1),\
&&_CASE(INST_LAPPEND_SCALAR4),\
&&_CASE(INST_LAPPEND_ARRAY1),\
&&_CASE(INST_LAPPEND_ARRAY4),\
&&_CASE(INST_LAPPEND_ARRAY_STK),\
&&_CASE(INST_LAPPEND_STK)\
}
#endif /* GCC methods */
/* End of method definitions */
#undef SWITCH
#undef GCC
#undef MSVC
#undef JUMP_version
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