vm/interp/Jit.h

/*
 * Copyright (C) 2009 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/*
 * Jit control
 */
#ifndef _DALVIK_INTERP_JIT
#define _DALVIK_INTERP_JIT

#include "InterpDefs.h"

#define JIT_PROF_SIZE 512

#define JIT_MAX_TRACE_LEN 100

/*
 * JitTable hash function.
 */
static inline u4 dvmJitHash( const u2* p ) {
    /*
     * TODO - Might make sense to keep "maxTableEntries - 1" as its own
     * variable for speed reasons.
     */
    return ((((u4)p>>12)^(u4)p)>>1) & (gDvmJit.maxTableEntries-1);
}

/*
 * Entries in the JIT's address lookup hash table.
 * with assembly hash function in mterp.
 * TODO: rework this structure now that the profile counts have
 * moved into their own table.
 */
typedef struct JitEntry {
    u2                unused;             /* was execution count */
    u2                chain;              /* Index of next in chain */
    const u2*         dPC;                /* Dalvik code address */
    void*             codeAddress;        /* Code address of native translation */
} JitEntry;

int dvmJitStartup(void);
void dvmJitShutdown(void);
int dvmCheckJit(const u2* pc, Thread* self, InterpState* interpState);
void* dvmJitGetCodeAddr(const u2* dPC);
void dvmJitSetCodeAddr(const u2* dPC, void *nPC);
bool dvmJitCheckTraceRequest(Thread* self, InterpState* interpState);
void* dvmJitChain(void* tgtAddr, u4* branchAddr);
void dvmJitStopTranslationRequests();
void dvmJitStats();

#endif /*_DALVIK_INTERP_JIT*/