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/* Copyright (c) 2003-2005 MySQL AB
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA */
#ifndef NDB_INTERPRETER_HPP
#define NDB_INTERPRETER_HPP
#include <ndb_types.h>
class Interpreter {
public:
inline static Uint32 mod4(Uint32 len){
return len + ((4 - (len & 3)) & 3);
}
/**
* General Mnemonic format
*
* i = Instruction - 5 Bits ( 0 - 5 ) max 63
* x = Register 1 - 3 Bits ( 6 - 8 ) max 7
* y = Register 2 - 3 Bits ( 9 -11 ) max 7
* b = Branch offset (only branches)
*
* 1111111111222222222233
* 01234567890123456789012345678901
* iiiiiixxxyyy bbbbbbbbbbbbbbbb
*
*
*/
/**
* Instructions
*/
STATIC_CONST( READ_ATTR_INTO_REG = 1 );
STATIC_CONST( WRITE_ATTR_FROM_REG = 2 );
STATIC_CONST( LOAD_CONST_NULL = 3 );
STATIC_CONST( LOAD_CONST16 = 4 );
STATIC_CONST( LOAD_CONST32 = 5 );
STATIC_CONST( LOAD_CONST64 = 6 );
STATIC_CONST( ADD_REG_REG = 7 );
STATIC_CONST( SUB_REG_REG = 8 );
STATIC_CONST( BRANCH = 9 );
STATIC_CONST( BRANCH_REG_EQ_NULL = 10 );
STATIC_CONST( BRANCH_REG_NE_NULL = 11 );
STATIC_CONST( BRANCH_EQ_REG_REG = 12 );
STATIC_CONST( BRANCH_NE_REG_REG = 13 );
STATIC_CONST( BRANCH_LT_REG_REG = 14 );
STATIC_CONST( BRANCH_LE_REG_REG = 15 );
STATIC_CONST( BRANCH_GT_REG_REG = 16 );
STATIC_CONST( BRANCH_GE_REG_REG = 17 );
STATIC_CONST( EXIT_OK = 18 );
STATIC_CONST( EXIT_REFUSE = 19 );
STATIC_CONST( CALL = 20 );
STATIC_CONST( RETURN = 21 );
STATIC_CONST( EXIT_OK_LAST = 22 );
STATIC_CONST( BRANCH_ATTR_OP_ARG = 23 );
STATIC_CONST( BRANCH_ATTR_EQ_NULL = 24 );
STATIC_CONST( BRANCH_ATTR_NE_NULL = 25 );
/**
* Macros for creating code
*/
static Uint32 Read(Uint32 AttrId, Uint32 Register);
static Uint32 Write(Uint32 AttrId, Uint32 Register);
static Uint32 LoadNull(Uint32 Register);
static Uint32 LoadConst16(Uint32 Register, Uint32 Value);
static Uint32 LoadConst32(Uint32 Register); // Value in next word
static Uint32 LoadConst64(Uint32 Register); // Value in next 2 words
static Uint32 Add(Uint32 DstReg, Uint32 SrcReg1, Uint32 SrcReg2);
static Uint32 Sub(Uint32 DstReg, Uint32 SrcReg1, Uint32 SrcReg2);
static Uint32 Branch(Uint32 Inst, Uint32 Reg1, Uint32 Reg2);
static Uint32 ExitOK();
/**
* Branch string
*
* i = Instruction - 5 Bits ( 0 - 5 ) max 63
* a = Attribute id
* l = Length of string
* b = Branch offset
* t = branch type
* d = Array length diff
* v = Varchar flag
* p = No-blank-padding flag for char compare
*
* 1111111111222222222233
* 01234567890123456789012345678901
* iiiiii ddvtttpbbbbbbbbbbbbbbbb
* aaaaaaaaaaaaaaaallllllllllllllll
* -string.... -
*/
enum UnaryCondition {
IS_NULL = 0,
IS_NOT_NULL = 1
};
enum BinaryCondition {
EQ = 0,
NE = 1,
LT = 2,
LE = 3,
GT = 4,
GE = 5,
LIKE = 6,
NOT_LIKE = 7
};
static Uint32 BranchCol(BinaryCondition cond,
Uint32 arrayLengthDiff, Uint32 varchar, bool nopad);
static Uint32 BranchCol_2(Uint32 AttrId);
static Uint32 BranchCol_2(Uint32 AttrId, Uint32 Len);
static Uint32 getBinaryCondition(Uint32 op1);
static Uint32 getArrayLengthDiff(Uint32 op1);
static Uint32 isVarchar(Uint32 op1);
static Uint32 isNopad(Uint32 op1);
static Uint32 getBranchCol_AttrId(Uint32 op2);
static Uint32 getBranchCol_Len(Uint32 op2);
/**
* Macros for decoding code
*/
static Uint32 getOpCode(Uint32 op);
static Uint32 getReg1(Uint32 op);
static Uint32 getReg2(Uint32 op);
static Uint32 getReg3(Uint32 op);
};
inline
Uint32
Interpreter::Read(Uint32 AttrId, Uint32 Register){
return (AttrId << 16) + (Register << 6) + READ_ATTR_INTO_REG;
}
inline
Uint32
Interpreter::Write(Uint32 AttrId, Uint32 Register){
return (AttrId << 16) + (Register << 6) + WRITE_ATTR_FROM_REG;
}
inline
Uint32
Interpreter::LoadConst16(Uint32 Register, Uint32 Value){
return (Value << 16) + (Register << 6) + LOAD_CONST16;
}
inline
Uint32
Interpreter::LoadConst32(Uint32 Register){
return (Register << 6) + LOAD_CONST32;
}
inline
Uint32
Interpreter::LoadConst64(Uint32 Register){
return (Register << 6) + LOAD_CONST64;
}
inline
Uint32
Interpreter::Add(Uint32 Dcoleg, Uint32 SrcReg1, Uint32 SrcReg2){
return (SrcReg1 << 6) + (SrcReg2 << 9) + (Dcoleg << 16) + ADD_REG_REG;
}
inline
Uint32
Interpreter::Sub(Uint32 Dcoleg, Uint32 SrcReg1, Uint32 SrcReg2){
return (SrcReg1 << 6) + (SrcReg2 << 9) + (Dcoleg << 16) + SUB_REG_REG;
}
inline
Uint32
Interpreter::Branch(Uint32 Inst, Uint32 Reg1, Uint32 Reg2){
return (Reg1 << 9) + (Reg2 << 6) + Inst;
}
inline
Uint32
Interpreter::BranchCol(BinaryCondition cond,
Uint32 arrayLengthDiff,
Uint32 varchar, bool nopad){
//ndbout_c("BranchCol: cond=%d diff=%u varchar=%u nopad=%d",
//cond, arrayLengthDiff, varchar, nopad);
return
BRANCH_ATTR_OP_ARG +
(arrayLengthDiff << 9) +
(varchar << 11) +
(cond << 12) +
(nopad << 15);
}
inline
Uint32
Interpreter::BranchCol_2(Uint32 AttrId, Uint32 Len){
return (AttrId << 16) + Len;
}
inline
Uint32
Interpreter::BranchCol_2(Uint32 AttrId){
return (AttrId << 16);
}
inline
Uint32
Interpreter::getBinaryCondition(Uint32 op){
return (op >> 12) & 0x7;
}
inline
Uint32
Interpreter::getArrayLengthDiff(Uint32 op){
return (op >> 9) & 0x3;
}
inline
Uint32
Interpreter::isVarchar(Uint32 op){
return (op >> 11) & 1;
}
inline
Uint32
Interpreter::isNopad(Uint32 op){
return (op >> 15) & 1;
}
inline
Uint32
Interpreter::getBranchCol_AttrId(Uint32 op){
return (op >> 16) & 0xFFFF;
}
inline
Uint32
Interpreter::getBranchCol_Len(Uint32 op){
return op & 0xFFFF;
}
inline
Uint32
Interpreter::ExitOK(){
return EXIT_OK;
}
inline
Uint32
Interpreter::getOpCode(Uint32 op){
return op & 0x3f;
}
inline
Uint32
Interpreter::getReg1(Uint32 op){
return (op >> 6) & 0x7;
}
inline
Uint32
Interpreter::getReg2(Uint32 op){
return (op >> 9) & 0x7;
}
inline
Uint32
Interpreter::getReg3(Uint32 op){
return (op >> 16) & 0x7;
}
#endif
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