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//
// Copyright (c) Microsoft. All rights reserved.
// Licensed under the MIT license. See LICENSE file in the project root for full license information.
//
/***************************************************************************/
/* OpInfo.h */
/***************************************************************************/
/* contains OpInfo, a wrapper that allows you to get useful information
about IL opcodes, and how to decode them */
/***************************************************************************/
#ifndef OpInfo_h
#define OpInfo_h
#include "openum.h"
// Decribes the flow of control properties of the instruction
enum OpFlow {
FLOW_META, // not a real instuction
FLOW_CALL, // a call instruction
FLOW_BRANCH, // unconditional branch, does not fall through
FLOW_COND_BRANCH, // may fall through
FLOW_PHI,
FLOW_THROW,
FLOW_BREAK,
FLOW_RETURN,
FLOW_NEXT, // flows into next instruction (none of the above)
};
// These are all the possible arguments for the instruction
/****************************************************************************/
union OpArgsVal {
__int32 i;
__int64 i8;
double r;
struct {
unsigned count;
int* targets; // targets are pcrelative displacements (little-endian)
} switch_;
struct {
unsigned count;
unsigned short* vars;
} phi;
};
/***************************************************************************/
// OpInfo parses a il instrution into an opcode, and a arg and updates the IP
class OpInfo {
public:
OpInfo() { data = 0; }
OpInfo(OPCODE opCode) { _ASSERTE(opCode < CEE_COUNT); data = &table[opCode]; }
// fetch instruction at 'instrPtr, fills in 'args' returns pointer
// to next instruction
const unsigned char* fetch(const unsigned char* instrPtr, OpArgsVal* args);
const char* getName() { return(data->name); }
OPCODE_FORMAT getArgsInfo() { return(OPCODE_FORMAT(data->format & PrimaryMask)); }
OpFlow getFlow() { return(data->flow); }
OPCODE getOpcode() { return((OPCODE) (data-table)); }
int getNumPop() { return(data->numPop); }
int getNumPush() { return(data->numPush); }
private:
struct OpInfoData {
const char* name;
OPCODE_FORMAT format : 8;
OpFlow flow : 8;
int numPop : 3; // < 0 means depends on instr args
int numPush : 3; // < 0 means depends on instr args
OPCODE opcode : 10; // This is the same as the index into the table
};
static OpInfoData table[];
private:
OpInfoData* data;
};
#endif
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