source: webkit/trunk/JavaScriptCore/VM/Opcode.cpp@ 34842

/*
 * Copyright (C) 2008 Apple Inc. All rights reserved.
 * Copyright (C) 2008 Cameron Zwarich <[email protected]>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1.  Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 * 2.  Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
 *     its contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "config.h"
#include "Opcode.h"

#include <stdlib.h>

using namespace std;

namespace KJS {

#if DUMP_OPCODE_STATS

long long OpcodeStats::opcodeCounts[numOpcodeIDs];
long long OpcodeStats::opcodePairCounts[numOpcodeIDs][numOpcodeIDs];
int OpcodeStats::lastOpcode = -1;

static OpcodeStats logger;

static const char* opcodeNames[] = {
    "load        ",
    "new_object  ",
    "new_array   ",
    "new_regexp  ",
    "mov         ",
    
    "not         ",
    "eq          ",
    "neq         ",
    "stricteq    ",
    "nstricteq   ",
    "less        ",
    "lesseq      ",
    
    "pre_inc     ",
    "pre_dec     ",
    "post_inc    ",
    "post_dec    ",
    "to_jsnumber ",
    "negate      ",
    "add         ",
    "mul         ",
    "div         ",
    "mod         ",
    "sub         ",
    
    "lshift      ",
    "rshift      ",
    "urshift     ",
    "bitand      ",
    "bitxor      ",
    "bitor       ",
    "bitnot      ",
    
    "instanceof  ",
    "typeof      ",
    "in          ",

    "resolve     ",
    "resolve_skip",
    "get_scoped_var",
    "put_scoped_var",
    "resolve_base",
    "resolve_with_base",
    "resolve_func",
    "get_by_id   ",
    "put_by_id   ",
    "del_by_id   ",
    "get_by_val  ",
    "put_by_val  ",
    "del_by_val  ",
    "put_by_index",
    "put_getter  ",
    "put_setter  ",

    "jmp         ",
    "jtrue       ",
    "jfalse      ",
    "jless       ",
    "jmp_scopes  ",
    "loop        ",
    "loop_if_true",
    "loop_if_less",

    "new_func    ",
    "new_func_exp",
    "call        ",
    "call_eval   ",
    "ret         ",

    "construct   ",

    "get_pnames  ",
    "next_pname  ",

    "push_scope  ",
    "pop_scope   ",

    "catch       ",
    "throw       ",
    "new_error   ",

    "jsr         ",
    "sret        ",

    "debug       ",

    "end         "
};

OpcodeStats::OpcodeStats()
{
    for (int i = 0; i < numOpcodeIDs; ++i)
        opcodeCounts[i] = 0;
    
    for (int i = 0; i < numOpcodeIDs; ++i)
        for (int j = 0; j < numOpcodeIDs; ++j)
            opcodePairCounts[i][j] = 0;
}

static int compareOpcodeIndices(const void* left, const void* right)
{
    long long leftValue = OpcodeStats::opcodeCounts[*(int*) left];
    long long rightValue = OpcodeStats::opcodeCounts[*(int*) right];
    
    if (leftValue < rightValue)
        return 1;
    else if (leftValue > rightValue)
        return -1;
    else
        return 0;
}

static int compareOpcodePairIndices(const void* left, const void* right)
{
    pair<int, int> leftPair = *(pair<int, int>*) left;
    long long leftValue = OpcodeStats::opcodePairCounts[leftPair.first][leftPair.second];
    pair<int, int> rightPair = *(pair<int, int>*) right;
    long long rightValue = OpcodeStats::opcodePairCounts[rightPair.first][rightPair.second];
    
    if (leftValue < rightValue)
        return 1;
    else if (leftValue > rightValue)
        return -1;
    else
        return 0;
}

OpcodeStats::~OpcodeStats()
{
    long long totalInstructions = 0;
    for (int i = 0; i < numOpcodeIDs; ++i)
        totalInstructions += opcodeCounts[i];
    
    long long totalInstructionPairs = 0;
    for (int i = 0; i < numOpcodeIDs; ++i)
        for (int j = 0; j < numOpcodeIDs; ++j)
            totalInstructionPairs += opcodePairCounts[i][j];

    int sortedIndices[numOpcodeIDs];    
    for (int i = 0; i < numOpcodeIDs; ++i)
        sortedIndices[i] = i;
    mergesort(sortedIndices, numOpcodeIDs, sizeof(int), compareOpcodeIndices);
    
    pair<int, int> sortedPairIndices[numOpcodeIDs * numOpcodeIDs];
    pair<int, int>* currentPairIndex = sortedPairIndices;
    for (int i = 0; i < numOpcodeIDs; ++i)
        for (int j = 0; j < numOpcodeIDs; ++j)
            *(currentPairIndex++) = make_pair(i, j);
    mergesort(sortedPairIndices, numOpcodeIDs * numOpcodeIDs, sizeof(pair<int, int>), compareOpcodePairIndices);
    
    printf("\nExecuted opcode statistics\n"); 
    
    printf("Total instructions executed: %lld\n\n", totalInstructions);

    printf("All opcodes by frequency:\n\n");

    for (int i = 0; i < numOpcodeIDs; ++i) {
        int index = sortedIndices[i];
        printf("%s: %lld - %.2f%%\n", opcodeNames[index], opcodeCounts[index], ((double) opcodeCounts[index]) / ((double) totalInstructions) * 100.0);    
    }
    
    printf("\n");
    printf("2-opcode sequences by frequency: %lld\n\n", totalInstructions);
    
    for (int i = 0; i < numOpcodeIDs * numOpcodeIDs; ++i) {
        pair<int, int> indexPair = sortedPairIndices[i];
        long long count = opcodePairCounts[indexPair.first][indexPair.second];
        
        if (!count)
            break;
        
        printf("%s %s: %lld %.2f%%\n", opcodeNames[indexPair.first], opcodeNames[indexPair.second], count, ((double) count) / ((double) totalInstructionPairs) * 100.0);
    }
    
    printf("\n");
    printf("Most common opcodes and sequences:\n");

    for (int i = 0; i < numOpcodeIDs; ++i) {
        int index = sortedIndices[i];
        long long opcodeCount = opcodeCounts[index];
        double opcodeProportion = ((double) opcodeCount) / ((double) totalInstructions);
        if (opcodeProportion < 0.0001)
            break;
        printf("\n%s: %lld - %.2f%%\n", opcodeNames[index], opcodeCount, opcodeProportion * 100.0);

        for (int j = 0; j < numOpcodeIDs * numOpcodeIDs; ++j) {
            pair<int, int> indexPair = sortedPairIndices[j];
            long long pairCount = opcodePairCounts[indexPair.first][indexPair.second];
            double pairProportion = ((double) pairCount) / ((double) totalInstructionPairs);
        
            if (!pairCount || pairProportion < 0.0001 || pairProportion < opcodeProportion / 100)
                break;

            if (indexPair.first != index && indexPair.second != index)
                continue;

            printf("    %s %s: %lld - %.2f%%\n", opcodeNames[indexPair.first], opcodeNames[indexPair.second], pairCount, pairProportion * 100.0);
        }
        
    }
    printf("\n");
}

void OpcodeStats::recordInstruction(int opcode)
{
    opcodeCounts[opcode]++;
    
    if (lastOpcode != -1)
        opcodePairCounts[lastOpcode][opcode]++;
    
    lastOpcode = opcode;
}

void OpcodeStats::resetLastInstruction()
{
    lastOpcode = -1;
}

#endif

} // namespace WTF