src/animator/SkScriptDecompile.cpp

/*
 * Copyright 2006 The Android Open Source Project
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */


#include "SkScript2.h"

#ifdef SK_DEBUG

#define TypeOpName(op) {SkScriptEngine2::op, #op }

static const struct OpName {
    SkScriptEngine2::TypeOp fOp;
    const char* fName;
} gOpNames[] = {
    TypeOpName(kNop), // should never get generated
    TypeOpName(kAccumulatorPop),
    TypeOpName(kAccumulatorPush),
    TypeOpName(kAddInt),
    TypeOpName(kAddScalar),
    TypeOpName(kAddString), // string concat
    TypeOpName(kArrayIndex),
    TypeOpName(kArrayParam),
    TypeOpName(kArrayToken),
    TypeOpName(kBitAndInt),
    TypeOpName(kBitNotInt),
    TypeOpName(kBitOrInt),
    TypeOpName(kBoxToken),
    TypeOpName(kCallback),
    TypeOpName(kDivideInt),
    TypeOpName(kDivideScalar),
    TypeOpName(kDotOperator),
    TypeOpName(kElseOp),
    TypeOpName(kEnd),
    TypeOpName(kEqualInt),
    TypeOpName(kEqualScalar),
    TypeOpName(kEqualString),
    TypeOpName(kFunctionCall),
    TypeOpName(kFlipOpsOp),
    TypeOpName(kFunctionToken),
    TypeOpName(kGreaterEqualInt),
    TypeOpName(kGreaterEqualScalar),
    TypeOpName(kGreaterEqualString),
    TypeOpName(kIfOp),
    TypeOpName(kIntToScalar),
    TypeOpName(kIntToScalar2),
    TypeOpName(kIntToString),
    TypeOpName(kIntToString2),
    TypeOpName(kIntegerAccumulator),
    TypeOpName(kIntegerOperand),
    TypeOpName(kLogicalAndInt),
    TypeOpName(kLogicalNotInt),
    TypeOpName(kLogicalOrInt),
    TypeOpName(kMemberOp),
    TypeOpName(kMinusInt),
    TypeOpName(kMinusScalar),
    TypeOpName(kModuloInt),
    TypeOpName(kModuloScalar),
    TypeOpName(kMultiplyInt),
    TypeOpName(kMultiplyScalar),
    TypeOpName(kPropertyOp),
    TypeOpName(kScalarAccumulator),
    TypeOpName(kScalarOperand),
    TypeOpName(kScalarToInt),
    TypeOpName(kScalarToInt2),
    TypeOpName(kScalarToString),
    TypeOpName(kScalarToString2),
    TypeOpName(kShiftLeftInt),
    TypeOpName(kShiftRightInt), // signed
    TypeOpName(kStringAccumulator),
    TypeOpName(kStringOperand),
    TypeOpName(kStringToInt),
    TypeOpName(kStringToScalar),
    TypeOpName(kStringToScalar2),
    TypeOpName(kStringTrack),
    TypeOpName(kSubtractInt),
    TypeOpName(kSubtractScalar),
    TypeOpName(kToBool),
    TypeOpName(kUnboxToken),
    TypeOpName(kUnboxToken2),
    TypeOpName(kXorInt)
};

static size_t gOpNamesSize = sizeof(gOpNames) / sizeof(gOpNames[0]);

#define OperandName(op) {SkOperand2::op, #op }

static const struct OperName {
    SkOperand2::OpType fType;
    const char* fName;
} gOperandNames[] = {
    OperandName(kNoType),
    OperandName(kS32),
    OperandName(kScalar),
    OperandName(kString),
    OperandName(kArray),
    OperandName(kObject)
};  

static size_t gOperandNamesSize = sizeof(gOperandNames) / sizeof(gOperandNames[0]);

// check to see that there are no missing or duplicate entries
void SkScriptEngine2::ValidateDecompileTable() {
    SkScriptEngine2::TypeOp op = SkScriptEngine2::kNop;
    size_t index;
    for (index = 0; index < gOpNamesSize; index++) {
        SkASSERT(gOpNames[index].fOp == op);
        op = (SkScriptEngine2::TypeOp) (op + 1);
    }
    index = 0;
    SkOperand2::OpType type = SkOperand2::kNoType;
    SkASSERT(gOperandNames[index].fType == type);
    for (; index < gOperandNamesSize - 1; ) {
        type = (SkOperand2::OpType) (1 << index);
        SkASSERT(gOperandNames[++index].fType == type);
    }
}

void SkScriptEngine2::decompile(const unsigned char* start, size_t length) {
    SkASSERT(length > 0);
    const unsigned char* opCode = start;
    do {
        SkASSERT((size_t)(opCode - start) < length);
        SkScriptEngine2::TypeOp op = (SkScriptEngine2::TypeOp) *opCode++;
        SkASSERT((size_t)op < gOpNamesSize);
        SkDebugf("%d: %s", opCode - start - 1, gOpNames[op].fName);
        switch (op) {
        case SkScriptEngine2::kCallback: {
            int index;
            memcpy(&index, opCode, sizeof(index));
            opCode += sizeof(index);
            SkDebugf(" index: %d", index);
            } break;
        case SkScriptEngine2::kFunctionCall: 
        case SkScriptEngine2::kMemberOp:
        case SkScriptEngine2::kPropertyOp: {
            size_t ref;
            memcpy(&ref, opCode, sizeof(ref));
            opCode += sizeof(ref);
            SkDebugf(" ref: %d", ref);
            } break;
        case SkScriptEngine2::kIntegerAccumulator:
        case SkScriptEngine2::kIntegerOperand: {
            int32_t integer;
            memcpy(&integer, opCode, sizeof(integer));
            opCode += sizeof(int32_t);
            SkDebugf(" integer: %d", integer);
            } break;
        case SkScriptEngine2::kScalarAccumulator:
        case SkScriptEngine2::kScalarOperand: {
            SkScalar scalar;
            memcpy(&scalar, opCode, sizeof(scalar));
            opCode += sizeof(SkScalar);
            SkDebugf(" scalar: %g", SkScalarToFloat(scalar));
            } break;
        case SkScriptEngine2::kStringAccumulator:
        case SkScriptEngine2::kStringOperand: {
            int size;
            SkString* strPtr = new SkString();
            memcpy(&size, opCode, sizeof(size));
            opCode += sizeof(size);
            strPtr->set((char*) opCode, size);
            opCode += size;
            SkDebugf(" string: %s", strPtr->c_str());
            delete strPtr;
            } break;
        case SkScriptEngine2::kBoxToken: {
            SkOperand2::OpType type;
            memcpy(&type, opCode, sizeof(type));
            opCode += sizeof(type);
            size_t index = 0;
            if (type == 0)
                SkDebugf(" type: %s", gOperandNames[index].fName);
            else {
                while (type != 0) {
                    SkASSERT(index + 1 < gOperandNamesSize);
                    if (type & (1 << index)) {
                        type = (SkOperand2::OpType) (type & ~(1 << index));
                        SkDebugf(" type: %s", gOperandNames[index + 1].fName);
                    }
                    index++;
                }
            }
            } break;
        case SkScriptEngine2::kIfOp:
        case SkScriptEngine2::kLogicalAndInt:
        case SkScriptEngine2::kElseOp:
        case SkScriptEngine2::kLogicalOrInt: {
            int size;
            memcpy(&size, opCode, sizeof(size));
            opCode += sizeof(size);
            SkDebugf(" offset (address): %d (%d)", size, opCode - start + size);
            } break;
        case SkScriptEngine2::kEnd:
            goto done;
        case SkScriptEngine2::kNop:
                SkASSERT(0);
        default:
            break;
    }
    SkDebugf("\n");
    } while (true);
done:
    SkDebugf("\n");
}

#endif