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/*
FALCON - The Falcon Programming Language.
FILE: pcode.cpp
Utilities to manage the Falcon Virtual Machine pseudo code.
-------------------------------------------------------------------
Author: Giancarlo Niccolai
Begin: Fri, 24 Jul 2009 19:42:40 +0200
-------------------------------------------------------------------
(C) Copyright 2009: the FALCON developers (see list in AUTHORS file)
See LICENSE file for licensing details.
*/
#include <falcon/pcode.h>
#include <falcon/common.h>
#include <falcon/module.h>
#include <falcon/symbol.h>
namespace Falcon {
void PCODE::convertEndianity( uint32 paramType, byte* targetArea, bool into )
{
switch( paramType )
{
case P_PARAM_INT32:
case P_PARAM_STRID:
case P_PARAM_LBIND:
case P_PARAM_GLOBID:
case P_PARAM_LOCID:
case P_PARAM_PARID:
case P_PARAM_NTD32:
*reinterpret_cast<int32 *>(targetArea) = endianInt32(*reinterpret_cast<int32 *>(targetArea) );
break;
case P_PARAM_INT64:
case P_PARAM_NTD64:
{
// high part - low part
if(into)
{
// load from our straight int
uint64 value64 = loadInt64( targetArea );
// endianize each subpart, and invert their position.
*reinterpret_cast<uint32 *>(targetArea+sizeof(uint32)) = endianInt32((uint32)(value64 >> 32));
*reinterpret_cast<uint32 *>(targetArea) = (uint32) endianInt32((uint32)(value64 & 0xFFFFFFFF));
}
else {
// load from different endianity
uint64 value64 = grabInt64( targetArea );
*reinterpret_cast<uint32 *>(targetArea) = (uint32)(value64 >> 32);
*reinterpret_cast<uint32 *>(targetArea+sizeof(uint32)) = (uint32) value64;
}
}
break;
case P_PARAM_NUM:
{
union t_unumeric {
struct t_integer {
uint32 high;
uint32 low;
} integer;
numeric number;
} unumeric;
unumeric.number = grabNum( targetArea );
// high part - low part
*reinterpret_cast<uint32 *>(targetArea) = unumeric.integer.high;
*reinterpret_cast<uint32 *>(targetArea+sizeof(uint32)) = unumeric.integer.low;
}
break;
}
}
uint32 PCODE::advanceParam( uint32 paramType )
{
uint32 offset;
switch( paramType )
{
case P_PARAM_NIL:
case P_PARAM_NOTUSED:
case P_PARAM_TRUE:
case P_PARAM_FALSE:
case P_PARAM_REGA:
case P_PARAM_REGB:
case P_PARAM_REGS1:
case P_PARAM_FSELF:
case P_PARAM_REGL1:
case P_PARAM_REGL2:
offset = 0;
break;
case P_PARAM_NUM:
case P_PARAM_INT64:
case P_PARAM_NTD64:
offset = 8;
break;
default:
offset = 4;
}
return offset;
}
void PCODE::deendianize( byte* code, uint32 codeSize, bool into )
{
uint32 iPos =0;
byte opcode;
while( iPos < codeSize )
{
opcode = code[ iPos ];
uint32 iStart = iPos;
// get the options
iPos += 4;
if( code[ iStart + 1 ] != 0 )
{
convertEndianity( code[ iStart + 1 ], code + iPos, into );
iPos += advanceParam( code[iStart + 1] );
if( code[ iStart + 2 ] != 0 )
{
convertEndianity( code[iStart + 2], code + iPos );
iPos += advanceParam( code[iStart + 2] );
if( code[ iStart + 3 ] != 0 )
{
convertEndianity( code[iStart + 3], code + iPos );
iPos += advanceParam( code[iStart + 3] );
}
}
}
// if the operation is a switch, it's handled a bit specially.
if ( opcode == P_SWCH || opcode == P_SELE )
{
// get the switch table (aready de-endianized in the above step)
iPos -= sizeof(int64);
uint16 sw_int, sw_rng, sw_str, sw_obj;
uint64 value64;
if ( into )
{
// we have just destroyed our int64 switch value, which must be inverted
value64 = grabInt64( code+iPos );
}
else {
// we have just correctly decoded our integer from the stream.
value64 = loadInt64( code + iPos );
}
sw_int = (int16) (value64 >> 48);
sw_rng = (int16) ((value64 >> 32) & 0xFFFF);
sw_str = (int16) ((value64 >> 16) & 0xFFFF);
sw_obj = (int16) (value64 & 0xFFFF);
iPos += sizeof( uint64 );
// Endianize the nil landing
*reinterpret_cast<uint32 *>(code+iPos) = endianInt32( *reinterpret_cast<uint32 *>(code+iPos) );
iPos += sizeof( uint32 );
// endianize the integer table
while( sw_int > 0 )
{
if( into )
{
// the int64 value
uint64 value64 = loadInt64( code+iPos );
// high part - low part
*reinterpret_cast<uint32 *>(code+iPos+sizeof(uint32)) = endianInt32((uint32)(value64 >> 32));
*reinterpret_cast<uint32 *>(code+iPos) = endianInt32((uint32) value64);
}
else {
uint64 value64 = grabInt64( code+iPos );
*reinterpret_cast<uint32 *>(code+iPos) = (uint32)(value64 >> 32);
*reinterpret_cast<uint32 *>(code+iPos+sizeof(uint32)) = (uint32) value64;
}
iPos += sizeof( int64 );
// and the landing
*reinterpret_cast<int32 *>(code+iPos) = endianInt32( *reinterpret_cast<int32 *>(code+iPos) );
iPos += sizeof( int32 );
--sw_int;
}
// endianize the range table
while( sw_rng > 0 )
{
// the int32 value -- start
*reinterpret_cast<int32 *>(code+iPos) = endianInt32( *reinterpret_cast<int32 *>(code+iPos) );
iPos += sizeof( int32 );
// the int32 value -- end
*reinterpret_cast<int32 *>(code+iPos) = endianInt32( *reinterpret_cast<int32 *>(code+iPos) );
iPos += sizeof( int32 );
// and the landing
*reinterpret_cast<int32 *>(code+iPos) = endianInt32( *reinterpret_cast<int32 *>(code+iPos) );
iPos += sizeof( int32 );
--sw_rng;
}
// endianize the string table
while( sw_str > 0 )
{
// the int32 string index
*reinterpret_cast<int32 *>(code+iPos) = endianInt32( *reinterpret_cast<int32 *>(code+iPos) );
iPos += sizeof( int32 );
// and the landing
*reinterpret_cast<int32 *>(code+iPos) = endianInt32( *reinterpret_cast<int32 *>(code+iPos) );
iPos += sizeof( int32 );
--sw_str;
}
// endianize the object table
while( sw_obj > 0 )
{
// the int32 symbol index
*reinterpret_cast<int32 *>(code+iPos) = endianInt32( *reinterpret_cast<int32 *>(code+iPos) );
iPos += sizeof( int32 );
// and the landing
*reinterpret_cast<int32 *>(code+iPos) = endianInt32( *reinterpret_cast<int32 *>(code+iPos) );
iPos += sizeof( int32 );
--sw_obj;
}
}
}
}
}
/* end of pcode.cpp */
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