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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
//
// State machine header used ONLY in the JIT.
//
#ifndef __sm_h__
#define __sm_h__
#include "smcommon.h"
extern const SMState* gp_SMStates;
extern const JumpTableCell* gp_SMJumpTableCells;
extern const short* gp_StateWeights;
class CodeSeqSM // Represent a particualr run of the state machine
// For example, it maintains the array of counts for the terminated states.
// These counts should be stored in per method based for them to be correct
// under multithreadeded environment.
{
public:
Compiler* pComp;
const SMState* States;
const JumpTableCell* JumpTableCells;
const short* StateWeights; // Weight for each state. Including non-terminate states.
SM_STATE_ID curState;
int NativeSize; // This is a signed integer!
void Start(Compiler* comp);
void Reset();
void End();
void Run(SM_OPCODE opcode DEBUGARG(int level));
SM_STATE_ID GetDestState(SM_STATE_ID srcState, SM_OPCODE opcode);
// Matched a termination state
inline void TermStateMatch(SM_STATE_ID stateID DEBUGARG(bool verbose))
{
assert(States[stateID].term);
assert(StateMatchedCounts[stateID] < _UI16_MAX);
#ifdef DEBUG
++StateMatchedCounts[stateID];
#ifndef SMGEN_COMPILE
if (verbose)
{
printf("weight=%3d : state %3d [ %s ]\n", StateWeights[stateID], stateID, StateDesc(stateID));
}
#endif // SMGEN_COMPILE
#endif // DEBUG
NativeSize += StateWeights[stateID];
}
// Given an SM opcode retrieve the weight for this single opcode state.
// For example, ID for single opcode state SM_NOSHOW is 2.
inline short GetWeightForOpcode(SM_OPCODE opcode)
{
SM_STATE_ID stateID = ((SM_STATE_ID)opcode) + SM_STATE_ID_START + 1;
return StateWeights[stateID];
}
#ifdef DEBUG
WORD StateMatchedCounts[NUM_SM_STATES];
const char* StateDesc(SM_STATE_ID stateID);
#endif
static SM_OPCODE MapToSMOpcode(OPCODE opcode);
};
#endif /* __sm_h__ */
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