DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Mercurial (d8847129d134)

VCS Links

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292

/*
 * Copyright 2011 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */
#ifndef SkScript2_DEFINED
#define SkScript2_DEFINED

#include "SkOperand2.h"
#include "SkStream.h"
#include "SkTDArray.h"
#include "SkTDArray_Experimental.h"
#include "SkTDict.h"
#include "SkTDStack.h"

typedef SkLongArray(SkString*) SkTDStringArray;

class SkAnimateMaker;
class SkScriptCallBack;

class SkScriptEngine2 {
public:
    enum Error {
        kNoError,
        kArrayIndexOutOfBounds,
        kCouldNotFindReferencedID,
        kFunctionCallFailed,
        kMemberOpFailed,
        kPropertyOpFailed
    };

    enum Attrs {
        kConstant,
        kVariable
    };

    SkScriptEngine2(SkOperand2::OpType returnType);
    ~SkScriptEngine2();
    bool convertTo(SkOperand2::OpType , SkScriptValue2* );
    bool evaluateScript(const char** script, SkScriptValue2* value);
    void forget(SkOpArray* array);
    Error getError() { return fError; }
    SkOperand2::OpType getReturnType() { return fReturnType; }
    void track(SkOpArray* array) {
        SkASSERT(fTrackArray.find(array) < 0);
        *fTrackArray.append() = array; }
    void track(SkString* string) {
        SkASSERT(fTrackString.find(string) < 0);
        *fTrackString.append() = string;
    }
    static bool ConvertTo(SkScriptEngine2* , SkOperand2::OpType toType, SkScriptValue2* value);
    static SkScalar IntToScalar(int32_t );
    static bool ValueToString(const SkScriptValue2& value, SkString* string);

    enum Op {        // used by tokenizer attribute table
        kUnassigned,
        kAdd,
        kBitAnd,
        kBitNot,
        kBitOr,
        kDivide,
        kEqual,
        kFlipOps,
        kGreaterEqual,
        kLogicalAnd,
        kLogicalNot,
        kLogicalOr,
        kMinus,
        kModulo,
        kMultiply,
        kShiftLeft,
        kShiftRight,    // signed
        kSubtract,
        kXor,
// following not in attribute table
        kArrayOp,
        kElse,
        kIf,
        kParen,
        kLastLogicalOp,
        kArtificialOp = 0x20
    };

    enum TypeOp {    // generated by tokenizer
        kNop, // should never get generated
        kAccumulatorPop,
        kAccumulatorPush,
        kAddInt,
        kAddScalar,
        kAddString,    // string concat
        kArrayIndex,
        kArrayParam,
        kArrayToken,
        kBitAndInt,
        kBitNotInt,
        kBitOrInt,
        kBoxToken,
        kCallback,
        kDivideInt,
        kDivideScalar,
        kDotOperator,
        kElseOp,
        kEnd,
        kEqualInt,
        kEqualScalar,
        kEqualString,
        kFunctionCall,
        kFlipOpsOp,
        kFunctionToken,
        kGreaterEqualInt,
        kGreaterEqualScalar,
        kGreaterEqualString,
        kIfOp,
        kIntToScalar,
        kIntToScalar2,
        kIntToString,
        kIntToString2,
        kIntegerAccumulator,
        kIntegerOperand,
        kLogicalAndInt,
        kLogicalNotInt,
        kLogicalOrInt,
        kMemberOp,
        kMinusInt,
        kMinusScalar,
        kModuloInt,
        kModuloScalar,
        kMultiplyInt,
        kMultiplyScalar,
        kPropertyOp,
        kScalarAccumulator,
        kScalarOperand,
        kScalarToInt,
        kScalarToInt2,
        kScalarToString,
        kScalarToString2,
        kShiftLeftInt,
        kShiftRightInt,    // signed
        kStringAccumulator,
        kStringOperand,
        kStringToInt,
        kStringToScalar,
        kStringToScalar2,
        kStringTrack,
        kSubtractInt,
        kSubtractScalar,
        kToBool,
        kUnboxToken,
        kUnboxToken2,
        kXorInt,
        kLastTypeOp
    };

    enum OpBias {
        kNoBias,
        kTowardsNumber = 0,
        kTowardsString
    };

protected:

    enum BraceStyle {
    //    kStructBrace,
        kArrayBrace,
        kFunctionBrace
    };

    enum AddTokenRegister {
        kAccumulator,
        kOperand
    };

    enum ResultIsBoolean {
        kResultIsNotBoolean,
        kResultIsBoolean
    };

    struct OperatorAttributes {
        unsigned int fLeftType : 3;    // SkOpType union, but only lower values
        unsigned int fRightType : 3;     // SkOpType union, but only lower values
        OpBias fBias : 1;
        ResultIsBoolean fResultIsBoolean : 1;
    };

    struct Branch {
        Branch() {
        }

        Branch(Op op, int depth, size_t offset)
            : fOffset(SkToU16(offset)), fOpStackDepth(depth), fOperator(op)
            , fPrimed(kIsNotPrimed), fDone(kIsNotDone) {
        }

        enum Primed {
            kIsNotPrimed,
            kIsPrimed
        };

        enum Done {
            kIsNotDone,
            kIsDone,
        };

        unsigned fOffset : 16; // offset in generated stream where branch needs to go
        int fOpStackDepth : 7; // depth when operator was found
        Op fOperator : 6; // operand which generated branch
        mutable Primed fPrimed : 1;    // mark when next instruction generates branch
        Done fDone : 1;    // mark when branch is complete
        void prime() { fPrimed = kIsPrimed; }
        void resolve(SkDynamicMemoryWStream* , size_t offset);
    };

    static const OperatorAttributes gOpAttributes[];
    static const signed char gPrecedence[];
    static const TypeOp gTokens[];
    void addToken(TypeOp );
    void addTokenConst(SkScriptValue2* , AddTokenRegister , SkOperand2::OpType , TypeOp );
    void addTokenInt(int );
    void addTokenScalar(SkScalar );
    void addTokenString(const SkString& );
    void addTokenValue(const SkScriptValue2& , AddTokenRegister );
    int arithmeticOp(char ch, char nextChar, bool lastPush);
    bool convertParams(SkTDArray<SkScriptValue2>* ,
        const SkOperand2::OpType* paramTypes, int paramTypeCount);
    void convertToString(SkOperand2* operand, SkOperand2::OpType type) {
        SkScriptValue2 scriptValue;
        scriptValue.fOperand = *operand;
        scriptValue.fType = type;
        convertTo(SkOperand2::kString, &scriptValue);
        *operand = scriptValue.fOperand;
    }
    bool evaluateDot(const char*& script);
    bool evaluateDotParam(const char*& script, const char* field, size_t fieldLength);
    bool functionParams(const char** scriptPtr, SkTDArray<SkScriptValue2>* params);
    size_t getTokenOffset();
    SkOperand2::OpType getUnboxType(SkOperand2 scriptValue);
    bool handleArrayIndexer(const char** scriptPtr);
    bool handleFunction(const char** scriptPtr);
    bool handleMember(const char* field, size_t len, void* object);
    bool handleMemberFunction(const char* field, size_t len, void* object,
        SkTDArray<SkScriptValue2>* params);
    bool handleProperty();
    bool handleUnbox(SkScriptValue2* scriptValue);
    bool innerScript(const char** scriptPtr, SkScriptValue2* value);
    int logicalOp(char ch, char nextChar);
    void processLogicalOp(Op op);
    bool processOp();
    void resolveBranch(Branch& );
//    void setAnimateMaker(SkAnimateMaker* maker) { fMaker = maker; }
    SkDynamicMemoryWStream fStream;
    SkDynamicMemoryWStream* fActiveStream;
    SkTDStack<BraceStyle> fBraceStack;        // curly, square, function paren
    SkTDStack<Branch> fBranchStack;  // logical operators, slot to store forward branch
    SkLongArray(SkScriptCallBack*) fCallBackArray;
    SkTDStack<Op> fOpStack;
    SkTDStack<SkScriptValue2> fValueStack;
//    SkAnimateMaker* fMaker;
    SkLongArray(SkOpArray*) fTrackArray;
    SkTDStringArray fTrackString;
    const char* fToken; // one-deep stack
    size_t fTokenLength;
    SkOperand2::OpType fReturnType;
    Error fError;
    SkOperand2::OpType fAccumulatorType;    // tracking for code generation
    SkBool fBranchPopAllowed;
    SkBool fConstExpression;
    SkBool fOperandInUse;
private:
#ifdef SK_DEBUG
public:
    void decompile(const unsigned char* , size_t );
    static void UnitTest();
    static void ValidateDecompileTable();
#endif
};

#ifdef SK_DEBUG

struct SkScriptNAnswer2 {
    const char* fScript;
    SkOperand2::OpType fType;
    int32_t fIntAnswer;
    SkScalar fScalarAnswer;
    const char* fStringAnswer;
};

#endif


#endif // SkScript2_DEFINED