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Lorenzo Cogotti
2021-06-07 16:55:13 +02:00
commit b0ef4dd774
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lonetix/bgp/vm_optab.h Normal file
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// SPDX-License-Identifier: LGPL-3.0-or-later
/**
* \file bgp/vm_optab.h
*
* Computed goto table for GNUC optimized BGP VM execution loop.
*
* \copyright The DoubleFourteen Code Forge (C) All Rights Reserved
* \author Lorenzo Cogotti
*
* File defines a GNUC-specific computed goto table.
*
* It can be used as an alternative to a regular switch to
* accelerate the BGP filtering engine execution loop (Bgp_VmExec()).
*
* Constraints:
* - Array length: 256 (8-bit OPCODE width)
* - Label address MUST follow the convention EX_<OPCODE NAME> (e.g. EX_NOP, EX_EXCT)
* - Any unused OPCODE MUST be set to EX_SIGILL
*
* Operations on the computed goto table are defined in: bgp/vm_gccdef.h
*
* \see [GCC Documentation](https://gcc.gnu.org/onlinedocs/gcc/Labels-as-Values.html)
*
* \warning KEEP TABLE IN SYNC WITH OPCODES IN: bgp/vm.h
*/
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wpedantic"
#pragma GCC diagnostic ignored "-Woverride-init"
static void *const bgp_vmOpTab[256] = {
// Following clears everything else in the array to SIGILL,
// 8 instructions per line (256 &&EX_SIGILL)
&&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL,
&&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL,
&&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL,
&&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL,
&&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL,
&&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL,
&&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL,
&&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL,
&&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL,
&&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL,
&&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL,
&&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL,
&&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL,
&&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL,
&&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL,
&&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL,
&&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL,
&&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL,
&&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL,
&&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL,
&&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL,
&&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL,
&&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL,
&&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL,
&&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL,
&&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL,
&&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL,
&&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL,
&&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL,
&&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL,
&&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL,
&&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL, &&EX_SIGILL,
// Following initializes valid OPCODEs
[BGP_VMOP_NOP] = &&EX_NOP,
[BGP_VMOP_LOAD] = &&EX_LOAD,
[BGP_VMOP_LOADU] = &&EX_LOADU,
[BGP_VMOP_LOADN] = &&EX_LOADN,
[BGP_VMOP_LOADK] = &&EX_LOADK,
[BGP_VMOP_CALL] = &&EX_CALL,
[BGP_VMOP_BLK] = &&EX_BLK,
[BGP_VMOP_ENDBLK] = &&EX_ENDBLK,
[BGP_VMOP_TAG] = &&EX_TAG,
[BGP_VMOP_NOT] = &&EX_NOT,
[BGP_VMOP_CFAIL] = &&EX_CFAIL,
[BGP_VMOP_CPASS] = &&EX_CPASS,
[BGP_VMOP_JZ] = &&EX_JZ,
[BGP_VMOP_JNZ] = &&EX_JNZ,
[BGP_VMOP_CHKT] = &&EX_CHKT,
[BGP_VMOP_CHKA] = &&EX_CHKA,
[BGP_VMOP_EXCT] = &&EX_EXCT,
[BGP_VMOP_SUPN] = &&EX_SUPN,
[BGP_VMOP_SUBN] = &&EX_SUBN,
[BGP_VMOP_RELT] = &&EX_RELT,
[BGP_VMOP_ASMTCH] = &&EX_ASMTCH,
[BGP_VMOP_FASMTC] = &&EX_FASMTC,
[BGP_VMOP_COMTCH] = &&EX_COMTCH,
[BGP_VMOP_ACOMTC] = &&EX_ACOMTC,
[BGP_VMOP_END] = &&EX_END
};
#pragma GCC diagnostic pop