regexp.c File Reference

#include <assert.h>
#include "jscript.h"
#include "regexp.h"
#include "wine/debug.h"

Include dependency graph for regexp.c:

Go to the source code of this file.

Classes
struct	RECharSet
struct	REProgState
struct	REBackTrackData
struct	REGlobalData
struct	RENode
struct	CompilerState
struct	EmitStateStackEntry
struct	REOpData

Macros
#define	ReportRegExpError(a, b, c)
#define	ReportRegExpErrorHelper(a, b, c, d)
#define	JS_ReportErrorNumber(a, b, c, d)
#define	JS_ReportErrorFlagsAndNumber(a, b, c, d, e, f)
#define	js_ReportOutOfScriptQuota(a)
#define	JS_ReportOutOfMemory(a)
#define	JS_COUNT_OPERATION(a, b)
#define	JSMSG_MIN_TOO_BIG   47
#define	JSMSG_MAX_TOO_BIG   48
#define	JSMSG_OUT_OF_ORDER   49
#define	JSMSG_OUT_OF_MEMORY   137
#define	LINE_SEPARATOR   0x2028
#define	PARA_SEPARATOR   0x2029
#define	RE_IS_LETTER(c)
#define	RE_IS_LINE_TERM(c)
#define	JS_ISWORD(c)   ((c) < 128 && (isalnum(c) || (c) == '_'))
#define	JS7_ISDEC(c)   ((((unsigned)(c)) - '0') <= 9)
#define	JS7_UNDEC(c)   ((c) - '0')
#define	REOP_IS_SIMPLE(op)   ((op) <= REOP_NCLASS)
#define	INITIAL_STATESTACK   100
#define	INITIAL_BACKTRACK   8000
#define	CLASS_CACHE_SIZE   4
#define	ARG_LEN   2
#define	GET_ARG(pc)   ((WORD)(((pc)[0] << 8) | (pc)[1]))
#define	SET_ARG(pc, arg)
#define	OFFSET_LEN   ARG_LEN
#define	OFFSET_MAX   ((1 << (ARG_LEN * 8)) - 1)
#define	GET_OFFSET(pc)   GET_ARG(pc)
#define	TREE_DEPTH_MAX   ((1 << 24) / sizeof(EmitStateStackEntry))
#define	CLASS_BITMAPS_MEM_LIMIT   (1 << 24)
#define	JUMP_OFFSET_HI(off)   ((jsbytecode)((off) >> 8))
#define	JUMP_OFFSET_LO(off)   ((jsbytecode)(off))
#define	JSREG_FIND_PAREN_COUNT   0x8000
#define	JSREG_FIND_PAREN_ERROR   0x4000
#define	OVERFLOW_VALUE   ((UINT)-1)
#define	INITIAL_STACK_SIZE   128
#define	PUSH_STATE_STACK(data)
#define	PREPARE_REPEAT()

Typedefs
typedef BYTE	JSPackedBool
typedef struct RECharSet	RECharSet
typedef enum REOp	REOp
typedef struct REProgState	REProgState
typedef struct REBackTrackData	REBackTrackData
typedef struct REGlobalData	REGlobalData
typedef struct RENode	RENode
typedef struct CompilerState	CompilerState
typedef struct EmitStateStackEntry	EmitStateStackEntry

Enumerations
enum	REOp {   REOP_EMPTY, REOP_BOL, REOP_EOL, REOP_WBDRY,   REOP_WNONBDRY, REOP_DOT, REOP_DIGIT, REOP_NONDIGIT,   REOP_ALNUM, REOP_NONALNUM, REOP_SPACE, REOP_NONSPACE,   REOP_BACKREF, REOP_FLAT, REOP_FLAT1, REOP_FLATi,   REOP_FLAT1i, REOP_UCFLAT1, REOP_UCFLAT1i, REOP_UCFLAT,   REOP_UCFLATi, REOP_CLASS, REOP_NCLASS, REOP_ALT,   REOP_QUANT, REOP_STAR, REOP_PLUS, REOP_OPT,   REOP_LPAREN, REOP_RPAREN, REOP_JUMP, REOP_DOTSTAR,   REOP_LPARENNON, REOP_ASSERT, REOP_ASSERT_NOT, REOP_ASSERTTEST,   REOP_ASSERTNOTTEST, REOP_MINIMALSTAR, REOP_MINIMALPLUS, REOP_MINIMALOPT,   REOP_MINIMALQUANT, REOP_ENDCHILD, REOP_REPEAT, REOP_MINIMALREPEAT,   REOP_ALTPREREQ, REOP_ALTPREREQ2, REOP_ENDALT, REOP_CONCAT,   REOP_END, REOP_LIMIT, REOP_EMPTY, REOP_BOL,   REOP_EOL, REOP_WBDRY, REOP_WNONBDRY, REOP_DOT,   REOP_DIGIT, REOP_NONDIGIT, REOP_ALNUM, REOP_NONALNUM,   REOP_SPACE, REOP_NONSPACE, REOP_BACKREF, REOP_FLAT,   REOP_FLAT1, REOP_FLATi, REOP_FLAT1i, REOP_UCFLAT1,   REOP_UCFLAT1i, REOP_UCFLAT, REOP_UCFLATi, REOP_CLASS,   REOP_NCLASS, REOP_ALT, REOP_QUANT, REOP_STAR,   REOP_PLUS, REOP_OPT, REOP_LPAREN, REOP_RPAREN,   REOP_JUMP, REOP_DOTSTAR, REOP_LPARENNON, REOP_ASSERT,   REOP_ASSERT_NOT, REOP_ASSERTTEST, REOP_ASSERTNOTTEST, REOP_MINIMALSTAR,   REOP_MINIMALPLUS, REOP_MINIMALOPT, REOP_MINIMALQUANT, REOP_ENDCHILD,   REOP_REPEAT, REOP_MINIMALREPEAT, REOP_ALTPREREQ, REOP_ALTPREREQ2,   REOP_ENDALT, REOP_CONCAT, REOP_END, REOP_LIMIT }

Functions
	WINE_DEFAULT_DEBUG_CHANNEL (jscript)
static BOOL	ParseRegExp (CompilerState *)
static size_t	GetCompactIndexWidth (size_t index)
static jsbytecode *	WriteCompactIndex (jsbytecode *pc, size_t index)
static jsbytecode *	ReadCompactIndex (jsbytecode *pc, size_t *result)
static RENode *	NewRENode (CompilerState *state, REOp op)
static BOOL	isASCIIHexDigit (WCHAR c, UINT *digit)
static BOOL	SetForwardJumpOffset (jsbytecode *jump, jsbytecode *target)
static jsbytecode *	EmitREBytecode (CompilerState *state, regexp_t *re, size_t treeDepth, jsbytecode *pc, RENode *t)
static BOOL	ProcessOp (CompilerState *state, REOpData *opData, RENode **operandStack, INT operandSP)
static UINT	FindParenCount (CompilerState *state)
static UINT	GetDecimalValue (WCHAR c, UINT max, UINT(*findMax)(CompilerState *state), CompilerState *state)
static BOOL	CalculateBitmapSize (CompilerState *state, RENode *target, const WCHAR *src, const WCHAR *end)
static INT	ParseMinMaxQuantifier (CompilerState *state, BOOL ignoreValues)
static BOOL	ParseQuantifier (CompilerState *state)
static BOOL	ParseTerm (CompilerState *state)
static REBackTrackData *	PushBackTrackState (REGlobalData *gData, REOp op, jsbytecode *target, match_state_t *x, const WCHAR *cp, size_t parenIndex, size_t parenCount)
static match_state_t *	FlatNIMatcher (REGlobalData *gData, match_state_t *x, const WCHAR *matchChars, size_t length)
static match_state_t *	BackrefMatcher (REGlobalData *gData, match_state_t *x, size_t parenIndex)
static void	AddCharacterToCharSet (RECharSet *cs, WCHAR c)
static void	AddCharacterRangeToCharSet (RECharSet *cs, UINT c1, UINT c2)
static BOOL	ProcessCharSet (REGlobalData *gData, RECharSet *charSet)
static BOOL	ReallocStateStack (REGlobalData *gData)
static match_state_t *	SimpleMatch (REGlobalData *gData, match_state_t *x, REOp op, jsbytecode **startpc, BOOL updatecp)
static match_state_t *	ExecuteREBytecode (REGlobalData *gData, match_state_t *x)
static match_state_t *	MatchRegExp (REGlobalData *gData, match_state_t *x)
static HRESULT	InitMatch (regexp_t *re, void *cx, heap_pool_t *pool, REGlobalData *gData)
HRESULT	regexp_execute (regexp_t *regexp, void *cx, heap_pool_t *pool, const WCHAR *str, DWORD str_len, match_state_t *result)
void	regexp_destroy (regexp_t *re)
regexp_t *	regexp_new (void *cx, heap_pool_t *pool, const WCHAR *str, DWORD str_len, WORD flags, BOOL flat)

Variables
static const char *	reop_names []

Macro Definition Documentation

ARG_LEN

#define ARG_LEN   2

Definition at line 332 of file regexp.c.

CLASS_BITMAPS_MEM_LIMIT

#define CLASS_BITMAPS_MEM_LIMIT   (1 << 24)

Definition at line 353 of file regexp.c.

CLASS_CACHE_SIZE

#define CLASS_CACHE_SIZE   4

Definition at line 292 of file regexp.c.

GET_ARG

#define GET_ARG

(

pc

)

((WORD)(((pc)[0] << 8) | (pc)[1]))

Definition at line 333 of file regexp.c.

GET_OFFSET

#define GET_OFFSET

(

pc

)

GET_ARG(pc)

Definition at line 339 of file regexp.c.

INITIAL_BACKTRACK

#define INITIAL_BACKTRACK   8000

Definition at line 232 of file regexp.c.

INITIAL_STACK_SIZE

#define INITIAL_STACK_SIZE   128

Definition at line 1648 of file regexp.c.

INITIAL_STATESTACK

#define INITIAL_STATESTACK   100

Definition at line 231 of file regexp.c.

JS7_ISDEC

#define JS7_ISDEC

(

c

)

((((unsigned)(c)) - '0') <= 9)

Definition at line 91 of file regexp.c.

JS7_UNDEC

#define JS7_UNDEC

(

c

)

((c) - '0')

Definition at line 92 of file regexp.c.

JS_COUNT_OPERATION

#define JS_COUNT_OPERATION	(		a,
			b
	)

Definition at line 50 of file regexp.c.

JS_ISWORD

#define JS_ISWORD

(

c

)

((c) < 128 && (isalnum(c) || (c) == '_'))

Definition at line 89 of file regexp.c.

JS_ReportErrorFlagsAndNumber

#define JS_ReportErrorFlagsAndNumber	(		a,
			b,
			c,
			d,
			e,
			f
	)

Definition at line 47 of file regexp.c.

JS_ReportErrorNumber

#define JS_ReportErrorNumber	(		a,
			b,
			c,
			d
	)

Definition at line 46 of file regexp.c.

JS_ReportOutOfMemory

#define JS_ReportOutOfMemory

(

a

)

Definition at line 49 of file regexp.c.

js_ReportOutOfScriptQuota

#define js_ReportOutOfScriptQuota

(

a

)

Definition at line 48 of file regexp.c.

JSMSG_MAX_TOO_BIG

#define JSMSG_MAX_TOO_BIG   48

Definition at line 77 of file regexp.c.

JSMSG_MIN_TOO_BIG

#define JSMSG_MIN_TOO_BIG   47

Definition at line 76 of file regexp.c.

JSMSG_OUT_OF_MEMORY

#define JSMSG_OUT_OF_MEMORY   137

Definition at line 79 of file regexp.c.

JSMSG_OUT_OF_ORDER

#define JSMSG_OUT_OF_ORDER   49

Definition at line 78 of file regexp.c.

JSREG_FIND_PAREN_COUNT

#define JSREG_FIND_PAREN_COUNT   0x8000

Definition at line 895 of file regexp.c.

JSREG_FIND_PAREN_ERROR

#define JSREG_FIND_PAREN_ERROR   0x4000

Definition at line 896 of file regexp.c.

JUMP_OFFSET_HI

#define JUMP_OFFSET_HI

(

off

)

((jsbytecode)((off) >> 8))

Definition at line 452 of file regexp.c.

JUMP_OFFSET_LO

#define JUMP_OFFSET_LO

(

off

)

((jsbytecode)(off))

Definition at line 453 of file regexp.c.

LINE_SEPARATOR

#define LINE_SEPARATOR   0x2028

Definition at line 81 of file regexp.c.

OFFSET_LEN

#define OFFSET_LEN   ARG_LEN

Definition at line 337 of file regexp.c.

OFFSET_MAX

#define OFFSET_MAX   ((1 << (ARG_LEN * 8)) - 1)

Definition at line 338 of file regexp.c.

OVERFLOW_VALUE

#define OVERFLOW_VALUE   ((UINT)-1)

Definition at line 903 of file regexp.c.

PARA_SEPARATOR

#define PARA_SEPARATOR   0x2029

Definition at line 82 of file regexp.c.

PREPARE_REPEAT

#define PREPARE_REPEAT

(

)

Value:

do {                                                                      \
        curState->index = x->cp - gData->cpbegin;                          \
        curState->continue_op = REOP_MINIMALREPEAT;                           \
        curState->continue_pc = pc;                                           \
        pc += ARG_LEN;                                                        \
        for (k = curState->parenSoFar; k < parenSoFar; k++)                   \
            x->parens[k].index = -1;                                          \
        PUSH_STATE_STACK(gData);                                              \
        op = (REOp) *pc++;                                                    \
        assert(op < REOP_LIMIT);                                              \
    }while(0)

PUSH_STATE_STACK

#define PUSH_STATE_STACK

(

data

)

Value:

do {                                                                      \
        ++(data)->stateStackTop;                                              \
        if ((data)->stateStackTop == (data)->stateStackLimit &&               \
            !ReallocStateStack((data))) {                                     \
            return NULL;                                                      \
        }                                                                     \
    }while(0)

Definition at line 2312 of file regexp.c.

RE_IS_LETTER

#define RE_IS_LETTER

(

c

)

Value:

(((c >= 'A') && (c <= 'Z')) ||                    \
                             ((c >= 'a') && (c <= 'z')) )

Definition at line 84 of file regexp.c.

RE_IS_LINE_TERM

#define RE_IS_LINE_TERM

(

c

)

Value:

((c == '\n') || (c == '\r') ||                    \
                             (c == LINE_SEPARATOR) || (c == PARA_SEPARATOR))

Definition at line 86 of file regexp.c.

REOP_IS_SIMPLE

#define REOP_IS_SIMPLE

(

op

)

((op) <= REOP_NCLASS)

Definition at line 147 of file regexp.c.

ReportRegExpError

#define ReportRegExpError	(		a,
			b,
			c
	)

Definition at line 44 of file regexp.c.

ReportRegExpErrorHelper

#define ReportRegExpErrorHelper	(		a,
			b,
			c,
			d
	)

Definition at line 45 of file regexp.c.

SET_ARG

#define SET_ARG	(		pc,
			arg
	)

Value:

((pc)[0] = (jsbytecode) ((arg) >> 8),       \
                             (pc)[1] = (jsbytecode) (arg))

Definition at line 334 of file regexp.c.

TREE_DEPTH_MAX

#define TREE_DEPTH_MAX   ((1 << 24) / sizeof(EmitStateStackEntry))

Definition at line 347 of file regexp.c.

Typedef Documentation

CompilerState

typedef struct CompilerState CompilerState

EmitStateStackEntry

typedef struct EmitStateStackEntry EmitStateStackEntry

JSPackedBool

typedef BYTE JSPackedBool

Definition at line 53 of file regexp.c.

REBackTrackData

typedef struct REBackTrackData REBackTrackData

RECharSet

typedef struct RECharSet RECharSet

REGlobalData

typedef struct REGlobalData REGlobalData

RENode

typedef struct RENode RENode

Definition at line 259 of file regexp.c.

REOp

typedef enum REOp REOp

REProgState

typedef struct REProgState REProgState

Enumeration Type Documentation

REOp

enum REOp

Enumerator
REOP_EMPTY
REOP_BOL
REOP_EOL
REOP_WBDRY
REOP_WNONBDRY
REOP_DOT
REOP_DIGIT
REOP_NONDIGIT
REOP_ALNUM
REOP_NONALNUM
REOP_SPACE
REOP_NONSPACE
REOP_BACKREF
REOP_FLAT
REOP_FLAT1
REOP_FLATi
REOP_FLAT1i
REOP_UCFLAT1
REOP_UCFLAT1i
REOP_UCFLAT
REOP_UCFLATi
REOP_CLASS
REOP_NCLASS
REOP_ALT
REOP_QUANT
REOP_STAR
REOP_PLUS
REOP_OPT
REOP_LPAREN
REOP_RPAREN
REOP_JUMP
REOP_DOTSTAR
REOP_LPARENNON
REOP_ASSERT
REOP_ASSERT_NOT
REOP_ASSERTTEST
REOP_ASSERTNOTTEST
REOP_MINIMALSTAR
REOP_MINIMALPLUS
REOP_MINIMALOPT
REOP_MINIMALQUANT
REOP_ENDCHILD
REOP_REPEAT
REOP_MINIMALREPEAT
REOP_ALTPREREQ
REOP_ALTPREREQ2
REOP_ENDALT
REOP_CONCAT
REOP_END
REOP_LIMIT
REOP_EMPTY
REOP_BOL
REOP_EOL
REOP_WBDRY
REOP_WNONBDRY
REOP_DOT
REOP_DIGIT
REOP_NONDIGIT
REOP_ALNUM
REOP_NONALNUM
REOP_SPACE
REOP_NONSPACE
REOP_BACKREF
REOP_FLAT
REOP_FLAT1
REOP_FLATi
REOP_FLAT1i
REOP_UCFLAT1
REOP_UCFLAT1i
REOP_UCFLAT
REOP_UCFLATi
REOP_CLASS
REOP_NCLASS
REOP_ALT
REOP_QUANT
REOP_STAR
REOP_PLUS
REOP_OPT
REOP_LPAREN
REOP_RPAREN
REOP_JUMP
REOP_DOTSTAR
REOP_LPARENNON
REOP_ASSERT
REOP_ASSERT_NOT
REOP_ASSERTTEST
REOP_ASSERTNOTTEST
REOP_MINIMALSTAR
REOP_MINIMALPLUS
REOP_MINIMALOPT
REOP_MINIMALQUANT
REOP_ENDCHILD
REOP_REPEAT
REOP_MINIMALREPEAT
REOP_ALTPREREQ
REOP_ALTPREREQ2
REOP_ENDALT
REOP_CONCAT
REOP_END
REOP_LIMIT

Definition at line 94 of file regexp.c.

                  {
    REOP_EMPTY,
    REOP_BOL,
    REOP_EOL,
    REOP_WBDRY,
    REOP_WNONBDRY,
    REOP_DOT,
    REOP_DIGIT,
    REOP_NONDIGIT,
    REOP_ALNUM,
    REOP_NONALNUM,
    REOP_SPACE,
    REOP_NONSPACE,
    REOP_BACKREF,
    REOP_FLAT,
    REOP_FLAT1,
    REOP_FLATi,
    REOP_FLAT1i,
    REOP_UCFLAT1,
    REOP_UCFLAT1i,
    REOP_UCFLAT,
    REOP_UCFLATi,
    REOP_CLASS,
    REOP_NCLASS,
    REOP_ALT,
    REOP_QUANT,
    REOP_STAR,
    REOP_PLUS,
    REOP_OPT,
    REOP_LPAREN,
    REOP_RPAREN,
    REOP_JUMP,
    REOP_DOTSTAR,
    REOP_LPARENNON,
    REOP_ASSERT,
    REOP_ASSERT_NOT,
    REOP_ASSERTTEST,
    REOP_ASSERTNOTTEST,
    REOP_MINIMALSTAR,
    REOP_MINIMALPLUS,
    REOP_MINIMALOPT,
    REOP_MINIMALQUANT,
    REOP_ENDCHILD,
    REOP_REPEAT,
    REOP_MINIMALREPEAT,
    REOP_ALTPREREQ,
    REOP_ALTPREREQ2,
    REOP_ENDALT,
    REOP_CONCAT,
    REOP_END,
    REOP_LIMIT /* META: no operator >= to this */
} REOp;

Function Documentation

AddCharacterRangeToCharSet()

static void AddCharacterRangeToCharSet ( RECharSet *  cs, UINT  c1, UINT  c2  )

static

Definition at line 2063 of file regexp.c.

{
    UINT i;

    UINT byteIndex1 = c1 >> 3;
    UINT byteIndex2 = c2 >> 3;

    assert(c2 <= cs->length && c1 <= c2);

    c1 &= 0x7;
    c2 &= 0x7;

    if (byteIndex1 == byteIndex2) {
        cs->u.bits[byteIndex1] |= ((BYTE)0xFF >> (7 - (c2 - c1))) << c1;
    } else {
        cs->u.bits[byteIndex1] |= 0xFF << c1;
        for (i = byteIndex1 + 1; i < byteIndex2; i++)
            cs->u.bits[i] = 0xFF;
        cs->u.bits[byteIndex2] |= (BYTE)0xFF >> (7 - c2);
    }
}

Referenced by ProcessCharSet().

AddCharacterToCharSet()

static void AddCharacterToCharSet ( RECharSet *  cs, WCHAR  c  )

static

Definition at line 2053 of file regexp.c.

{
    UINT byteIndex = (UINT)(c >> 3);
    assert(c <= cs->length);
    cs->u.bits[byteIndex] |= 1 << (c & 0x7);
}

Referenced by ProcessCharSet().

BackrefMatcher()

static match_state_t* BackrefMatcher ( REGlobalData *  gData, match_state_t *  x, size_t  parenIndex  )

static

Definition at line 2022 of file regexp.c.

{
    size_t len, i;
    const WCHAR *parenContent;
    RECapture *cap = &x->parens[parenIndex];

    if (cap->index == -1)
        return x;

    len = cap->length;
    if (x->cp + len > gData->cpend)
        return NULL;

    parenContent = &gData->cpbegin[cap->index];
    if (gData->regexp->flags & REG_FOLD) {
        for (i = 0; i < len; i++) {
            if (towupper(parenContent[i]) != towupper(x->cp[i]))
                return NULL;
        }
    } else {
        for (i = 0; i < len; i++) {
            if (parenContent[i] != x->cp[i])
                return NULL;
        }
    }
    x->cp += len;
    return x;
}

Referenced by SimpleMatch().

CalculateBitmapSize()

static BOOL CalculateBitmapSize ( CompilerState *  state, RENode *  target, const WCHAR *  src, const WCHAR *  end  )

static

Definition at line 969 of file regexp.c.

{
    UINT max = 0;
    BOOL inRange = FALSE;
    WCHAR c, rangeStart = 0;
    UINT n, digit, nDigits, i;

    target->u.ucclass.bmsize = 0;
    target->u.ucclass.sense = TRUE;

    if (src == end)
        return TRUE;

    if (*src == '^') {
        ++src;
        target->u.ucclass.sense = FALSE;
    }

    while (src != end) {
        BOOL canStartRange = TRUE;
        UINT localMax = 0;

        switch (*src) {
          case '\\':
            ++src;
            c = *src++;
            switch (c) {
              case 'b':
                localMax = 0x8;
                break;
              case 'f':
                localMax = 0xC;
                break;
              case 'n':
                localMax = 0xA;
                break;
              case 'r':
                localMax = 0xD;
                break;
              case 't':
                localMax = 0x9;
                break;
              case 'v':
                localMax = 0xB;
                break;
              case 'c':
                if (src < end && RE_IS_LETTER(*src)) {
                    localMax = (UINT) (*src++) & 0x1F;
                } else {
                    --src;
                    localMax = '\\';
                }
                break;
              case 'x':
                nDigits = 2;
                goto lexHex;
              case 'u':
                nDigits = 4;
lexHex:
                n = 0;
                for (i = 0; (i < nDigits) && (src < end); i++) {
                    c = *src++;
                    if (!isASCIIHexDigit(c, &digit)) {
                        /*
                         * Back off to accepting the original
                         *'\' as a literal.
                         */
                        src -= i + 1;
                        n = '\\';
                        break;
                    }
                    n = (n << 4) | digit;
                }
                localMax = n;
                break;
              case 'd':
                canStartRange = FALSE;
                if (inRange) {
                    JS_ReportErrorNumber(state->context,
                                         js_GetErrorMessage, NULL,
                                         JSMSG_BAD_CLASS_RANGE);
                    return FALSE;
                }
                localMax = '9';
                break;
              case 'D':
              case 's':
              case 'S':
              case 'w':
              case 'W':
                canStartRange = FALSE;
                if (inRange) {
                    JS_ReportErrorNumber(state->context,
                                         js_GetErrorMessage, NULL,
                                         JSMSG_BAD_CLASS_RANGE);
                    return FALSE;
                }
                max = 65535;

                /*
                 * If this is the start of a range, ensure that it's less than
                 * the end.
                 */
                localMax = 0;
                break;
              case '0':
              case '1':
              case '2':
              case '3':
              case '4':
              case '5':
              case '6':
              case '7':
                /*
                 *  This is a non-ECMA extension - decimal escapes (in this
                 *  case, octal!) are supposed to be an error inside class
                 *  ranges, but supported here for backwards compatibility.
                 *
                 */
                n = JS7_UNDEC(c);
                c = *src;
                if ('0' <= c && c <= '7') {
                    src++;
                    n = 8 * n + JS7_UNDEC(c);
                    c = *src;
                    if ('0' <= c && c <= '7') {
                        src++;
                        i = 8 * n + JS7_UNDEC(c);
                        if (i <= 0377)
                            n = i;
                        else
                            src--;
                    }
                }
                localMax = n;
                break;

              default:
                localMax = c;
                break;
            }
            break;
          default:
            localMax = *src++;
            break;
        }

        if (inRange) {
            /* Throw a SyntaxError here, per ECMA-262, 15.10.2.15. */
            if (rangeStart > localMax) {
                JS_ReportErrorNumber(state->context,
                                     js_GetErrorMessage, NULL,
                                     JSMSG_BAD_CLASS_RANGE);
                return FALSE;
            }
            inRange = FALSE;
        } else {
            if (canStartRange && src < end - 1) {
                if (*src == '-') {
                    ++src;
                    inRange = TRUE;
                    rangeStart = (WCHAR)localMax;
                    continue;
                }
            }
            if (state->flags & REG_FOLD)
                rangeStart = localMax;   /* one run of the uc/dc loop below */
        }

        if (state->flags & REG_FOLD) {
            WCHAR maxch = localMax;

            for (i = rangeStart; i <= localMax; i++) {
                WCHAR uch, dch;

                uch = towupper(i);
                dch = towlower(i);
                if(maxch < uch)
                    maxch = uch;
                if(maxch < dch)
                    maxch = dch;
            }
            localMax = maxch;
        }

        if (localMax > max)
            max = localMax;
    }
    target->u.ucclass.bmsize = max;
    return TRUE;
}

Referenced by ParseTerm().

EmitREBytecode()

static jsbytecode* EmitREBytecode ( CompilerState *  state, regexp_t *  re, size_t  treeDepth, jsbytecode *  pc, RENode *  t  )

static

Definition at line 475 of file regexp.c.

{
    EmitStateStackEntry *emitStateSP, *emitStateStack;
    RECharSet *charSet;
    REOp op;

    if (treeDepth == 0) {
        emitStateStack = NULL;
    } else {
        emitStateStack = heap_alloc(sizeof(EmitStateStackEntry) * treeDepth);
        if (!emitStateStack)
            return NULL;
    }
    emitStateSP = emitStateStack;
    op = t->op;
    assert(op < REOP_LIMIT);

    for (;;) {
        *pc++ = op;
        switch (op) {
          case REOP_EMPTY:
            --pc;
            break;

          case REOP_ALTPREREQ2:
          case REOP_ALTPREREQ:
            assert(emitStateSP);
            emitStateSP->altHead = pc - 1;
            emitStateSP->endTermFixup = pc;
            pc += OFFSET_LEN;
            SET_ARG(pc, t->u.altprereq.ch1);
            pc += ARG_LEN;
            SET_ARG(pc, t->u.altprereq.ch2);
            pc += ARG_LEN;

            emitStateSP->nextAltFixup = pc;    /* offset to next alternate */
            pc += OFFSET_LEN;

            emitStateSP->continueNode = t;
            emitStateSP->continueOp = REOP_JUMP;
            emitStateSP->jumpToJumpFlag = FALSE;
            ++emitStateSP;
            assert((size_t)(emitStateSP - emitStateStack) <= treeDepth);
            t = t->kid;
            op = t->op;
            assert(op < REOP_LIMIT);
            continue;

          case REOP_JUMP:
            emitStateSP->nextTermFixup = pc;    /* offset to following term */
            pc += OFFSET_LEN;
            if (!SetForwardJumpOffset(emitStateSP->nextAltFixup, pc))
                goto jump_too_big;
            emitStateSP->continueOp = REOP_ENDALT;
            ++emitStateSP;
            assert((size_t)(emitStateSP - emitStateStack) <= treeDepth);
            t = t->u.kid2;
            op = t->op;
            assert(op < REOP_LIMIT);
            continue;

          case REOP_ENDALT:
            /*
             * If we already patched emitStateSP->nextTermFixup to jump to
             * a nearer jump, to avoid 16-bit immediate offset overflow, we
             * are done here.
             */
            if (emitStateSP->jumpToJumpFlag)
                break;

            /*
             * Fix up the REOP_JUMP offset to go to the op after REOP_ENDALT.
             * REOP_ENDALT is executed only on successful match of the last
             * alternate in a group.
             */
            if (!SetForwardJumpOffset(emitStateSP->nextTermFixup, pc))
                goto jump_too_big;
            if (t->op != REOP_ALT) {
                if (!SetForwardJumpOffset(emitStateSP->endTermFixup, pc))
                    goto jump_too_big;
            }

            /*
             * If the program is bigger than the REOP_JUMP offset range, then
             * we must check for alternates before this one that are part of
             * the same group, and fix up their jump offsets to target jumps
             * close enough to fit in a 16-bit unsigned offset immediate.
             */
            if ((size_t)(pc - re->program) > OFFSET_MAX &&
                emitStateSP > emitStateStack) {
                EmitStateStackEntry *esp, *esp2;
                jsbytecode *alt, *jump;
                ptrdiff_t span, header;

                esp2 = emitStateSP;
                alt = esp2->altHead;
                for (esp = esp2 - 1; esp >= emitStateStack; --esp) {
                    if (esp->continueOp == REOP_ENDALT &&
                        !esp->jumpToJumpFlag &&
                        esp->nextTermFixup + OFFSET_LEN == alt &&
                        (size_t)(pc - ((esp->continueNode->op != REOP_ALT)
                                       ? esp->endTermFixup
                                       : esp->nextTermFixup)) > OFFSET_MAX) {
                        alt = esp->altHead;
                        jump = esp->nextTermFixup;

                        /*
                         * The span must be 1 less than the distance from
                         * jump offset to jump offset, so we actually jump
                         * to a REOP_JUMP bytecode, not to its offset!
                         */
                        for (;;) {
                            assert(jump < esp2->nextTermFixup);
                            span = esp2->nextTermFixup - jump - 1;
                            if ((size_t)span <= OFFSET_MAX)
                                break;
                            do {
                                if (--esp2 == esp)
                                    goto jump_too_big;
                            } while (esp2->continueOp != REOP_ENDALT);
                        }

                        jump[0] = JUMP_OFFSET_HI(span);
                        jump[1] = JUMP_OFFSET_LO(span);

                        if (esp->continueNode->op != REOP_ALT) {
                            /*
                             * We must patch the offset at esp->endTermFixup
                             * as well, for the REOP_ALTPREREQ{,2} opcodes.
                             * If we're unlucky and endTermFixup is more than
                             * OFFSET_MAX bytes from its target, we cheat by
                             * jumping 6 bytes to the jump whose offset is at
                             * esp->nextTermFixup, which has the same target.
                             */
                            jump = esp->endTermFixup;
                            header = esp->nextTermFixup - jump;
                            span += header;
                            if ((size_t)span > OFFSET_MAX)
                                span = header;

                            jump[0] = JUMP_OFFSET_HI(span);
                            jump[1] = JUMP_OFFSET_LO(span);
                        }

                        esp->jumpToJumpFlag = TRUE;
                    }
                }
            }
            break;

          case REOP_ALT:
            assert(emitStateSP);
            emitStateSP->altHead = pc - 1;
            emitStateSP->nextAltFixup = pc;     /* offset to next alternate */
            pc += OFFSET_LEN;
            emitStateSP->continueNode = t;
            emitStateSP->continueOp = REOP_JUMP;
            emitStateSP->jumpToJumpFlag = FALSE;
            ++emitStateSP;
            assert((size_t)(emitStateSP - emitStateStack) <= treeDepth);
            t = t->kid;
            op = t->op;
            assert(op < REOP_LIMIT);
            continue;

          case REOP_FLAT:
            /*
             * Coalesce FLATs if possible and if it would not increase bytecode
             * beyond preallocated limit. The latter happens only when bytecode
             * size for coalesced string with offset p and length 2 exceeds 6
             * bytes preallocated for 2 single char nodes, i.e. when
             * 1 + GetCompactIndexWidth(p) + GetCompactIndexWidth(2) > 6 or
             * GetCompactIndexWidth(p) > 4.
             * Since when GetCompactIndexWidth(p) <= 4 coalescing of 3 or more
             * nodes strictly decreases bytecode size, the check has to be
             * done only for the first coalescing.
             */
            if (t->kid &&
                GetCompactIndexWidth((WCHAR*)t->kid - state->cpbegin) <= 4)
            {
                while (t->next &&
                       t->next->op == REOP_FLAT &&
                       (WCHAR*)t->kid + t->u.flat.length ==
                       t->next->kid) {
                    t->u.flat.length += t->next->u.flat.length;
                    t->next = t->next->next;
                }
            }
            if (t->kid && t->u.flat.length > 1) {
                pc[-1] = (state->flags & REG_FOLD) ? REOP_FLATi : REOP_FLAT;
                pc = WriteCompactIndex(pc, (WCHAR*)t->kid - state->cpbegin);
                pc = WriteCompactIndex(pc, t->u.flat.length);
            } else if (t->u.flat.chr < 256) {
                pc[-1] = (state->flags & REG_FOLD) ? REOP_FLAT1i : REOP_FLAT1;
                *pc++ = (jsbytecode) t->u.flat.chr;
            } else {
                pc[-1] = (state->flags & REG_FOLD)
                         ? REOP_UCFLAT1i
                         : REOP_UCFLAT1;
                SET_ARG(pc, t->u.flat.chr);
                pc += ARG_LEN;
            }
            break;

          case REOP_LPAREN:
            assert(emitStateSP);
            pc = WriteCompactIndex(pc, t->u.parenIndex);
            emitStateSP->continueNode = t;
            emitStateSP->continueOp = REOP_RPAREN;
            ++emitStateSP;
            assert((size_t)(emitStateSP - emitStateStack) <= treeDepth);
            t = t->kid;
            op = t->op;
            continue;

          case REOP_RPAREN:
            pc = WriteCompactIndex(pc, t->u.parenIndex);
            break;

          case REOP_BACKREF:
            pc = WriteCompactIndex(pc, t->u.parenIndex);
            break;

          case REOP_ASSERT:
            assert(emitStateSP);
            emitStateSP->nextTermFixup = pc;
            pc += OFFSET_LEN;
            emitStateSP->continueNode = t;
            emitStateSP->continueOp = REOP_ASSERTTEST;
            ++emitStateSP;
            assert((size_t)(emitStateSP - emitStateStack) <= treeDepth);
            t = t->kid;
            op = t->op;
            continue;

          case REOP_ASSERTTEST:
          case REOP_ASSERTNOTTEST:
            if (!SetForwardJumpOffset(emitStateSP->nextTermFixup, pc))
                goto jump_too_big;
            break;

          case REOP_ASSERT_NOT:
            assert(emitStateSP);
            emitStateSP->nextTermFixup = pc;
            pc += OFFSET_LEN;
            emitStateSP->continueNode = t;
            emitStateSP->continueOp = REOP_ASSERTNOTTEST;
            ++emitStateSP;
            assert((size_t)(emitStateSP - emitStateStack) <= treeDepth);
            t = t->kid;
            op = t->op;
            continue;

          case REOP_QUANT:
            assert(emitStateSP);
            if (t->u.range.min == 0 && t->u.range.max == (UINT)-1) {
                pc[-1] = (t->u.range.greedy) ? REOP_STAR : REOP_MINIMALSTAR;
            } else if (t->u.range.min == 0 && t->u.range.max == 1) {
                pc[-1] = (t->u.range.greedy) ? REOP_OPT : REOP_MINIMALOPT;
            } else if (t->u.range.min == 1 && t->u.range.max == (UINT) -1) {
                pc[-1] = (t->u.range.greedy) ? REOP_PLUS : REOP_MINIMALPLUS;
            } else {
                if (!t->u.range.greedy)
                    pc[-1] = REOP_MINIMALQUANT;
                pc = WriteCompactIndex(pc, t->u.range.min);
                /*
                 * Write max + 1 to avoid using size_t(max) + 1 bytes
                 * for (UINT)-1 sentinel.
                 */
                pc = WriteCompactIndex(pc, t->u.range.max + 1);
            }
            emitStateSP->nextTermFixup = pc;
            pc += OFFSET_LEN;
            emitStateSP->continueNode = t;
            emitStateSP->continueOp = REOP_ENDCHILD;
            ++emitStateSP;
            assert((size_t)(emitStateSP - emitStateStack) <= treeDepth);
            t = t->kid;
            op = t->op;
            continue;

          case REOP_ENDCHILD:
            if (!SetForwardJumpOffset(emitStateSP->nextTermFixup, pc))
                goto jump_too_big;
            break;

          case REOP_CLASS:
            if (!t->u.ucclass.sense)
                pc[-1] = REOP_NCLASS;
            pc = WriteCompactIndex(pc, t->u.ucclass.index);
            charSet = &re->classList[t->u.ucclass.index];
            charSet->converted = FALSE;
            charSet->length = t->u.ucclass.bmsize;
            charSet->u.src.startIndex = t->u.ucclass.startIndex;
            charSet->u.src.length = t->u.ucclass.kidlen;
            charSet->sense = t->u.ucclass.sense;
            break;

          default:
            break;
        }

        t = t->next;
        if (t) {
            op = t->op;
        } else {
            if (emitStateSP == emitStateStack)
                break;
            --emitStateSP;
            t = emitStateSP->continueNode;
            op = (REOp) emitStateSP->continueOp;
        }
    }

  cleanup:
    heap_free(emitStateStack);
    return pc;

  jump_too_big:
    ReportRegExpError(state, JSREPORT_ERROR, JSMSG_REGEXP_TOO_COMPLEX);
    pc = NULL;
    goto cleanup;
}

Referenced by regexp_new().

ExecuteREBytecode()

static match_state_t* ExecuteREBytecode ( REGlobalData *  gData, match_state_t *  x  )

inlinestatic

Definition at line 2536 of file regexp.c.

{
    match_state_t *result = NULL;
    REBackTrackData *backTrackData;
    jsbytecode *nextpc, *testpc;
    REOp nextop;
    RECapture *cap;
    REProgState *curState;
    const WCHAR *startcp;
    size_t parenIndex, k;
    size_t parenSoFar = 0;

    WCHAR matchCh1, matchCh2;
    RECharSet *charSet;

    BOOL anchor;
    jsbytecode *pc = gData->regexp->program;
    REOp op = (REOp) *pc++;

    /*
     * If the first node is a simple match, step the index into the string
     * until that match is made, or fail if it can't be found at all.
     */
    if (REOP_IS_SIMPLE(op) && !(gData->regexp->flags & REG_STICKY)) {
        anchor = FALSE;
        while (x->cp <= gData->cpend) {
            nextpc = pc;    /* reset back to start each time */
            result = SimpleMatch(gData, x, op, &nextpc, TRUE);
            if (result) {
                anchor = TRUE;
                x = result;
                pc = nextpc;    /* accept skip to next opcode */
                op = (REOp) *pc++;
                assert(op < REOP_LIMIT);
                break;
            }
            gData->skipped++;
            x->cp++;
        }
        if (!anchor)
            goto bad;
    }

    for (;;) {
        const char *opname = reop_names[op];
        TRACE("\n%06d: %*s%s\n", (int)(pc - gData->regexp->program),
              (int)gData->stateStackTop * 2, "", opname);

        if (REOP_IS_SIMPLE(op)) {
            result = SimpleMatch(gData, x, op, &pc, TRUE);
        } else {
            curState = &gData->stateStack[gData->stateStackTop];
            switch (op) {
              case REOP_END:
                goto good;
              case REOP_ALTPREREQ2:
                nextpc = pc + GET_OFFSET(pc);   /* start of next op */
                pc += ARG_LEN;
                matchCh2 = GET_ARG(pc);
                pc += ARG_LEN;
                k = GET_ARG(pc);
                pc += ARG_LEN;

                if (x->cp != gData->cpend) {
                    if (*x->cp == matchCh2)
                        goto doAlt;

                    charSet = &gData->regexp->classList[k];
                    if (!charSet->converted && !ProcessCharSet(gData, charSet))
                        goto bad;
                    matchCh1 = *x->cp;
                    k = matchCh1 >> 3;
                    if ((charSet->length == 0 ||
                         matchCh1 > charSet->length ||
                         !(charSet->u.bits[k] & (1 << (matchCh1 & 0x7)))) ^
                        charSet->sense) {
                        goto doAlt;
                    }
                }
                result = NULL;
                break;

              case REOP_ALTPREREQ:
                nextpc = pc + GET_OFFSET(pc);   /* start of next op */
                pc += ARG_LEN;
                matchCh1 = GET_ARG(pc);
                pc += ARG_LEN;
                matchCh2 = GET_ARG(pc);
                pc += ARG_LEN;
                if (x->cp == gData->cpend ||
                    (*x->cp != matchCh1 && *x->cp != matchCh2)) {
                    result = NULL;
                    break;
                }
                /* else fall through... */

              case REOP_ALT:
              doAlt:
                nextpc = pc + GET_OFFSET(pc);   /* start of next alternate */
                pc += ARG_LEN;                  /* start of this alternate */
                curState->parenSoFar = parenSoFar;
                PUSH_STATE_STACK(gData);
                op = (REOp) *pc++;
                startcp = x->cp;
                if (REOP_IS_SIMPLE(op)) {
                    if (!SimpleMatch(gData, x, op, &pc, TRUE)) {
                        op = (REOp) *nextpc++;
                        pc = nextpc;
                        continue;
                    }
                    result = x;
                    op = (REOp) *pc++;
                }
                nextop = (REOp) *nextpc++;
                if (!PushBackTrackState(gData, nextop, nextpc, x, startcp, 0, 0))
                    goto bad;
                continue;

              /*
               * Occurs at (successful) end of REOP_ALT,
               */
              case REOP_JUMP:
                /*
                 * If we have not gotten a result here, it is because of an
                 * empty match.  Do the same thing REOP_EMPTY would do.
                 */
                if (!result)
                    result = x;

                --gData->stateStackTop;
                pc += GET_OFFSET(pc);
                op = (REOp) *pc++;
                continue;

              /*
               * Occurs at last (successful) end of REOP_ALT,
               */
              case REOP_ENDALT:
                /*
                 * If we have not gotten a result here, it is because of an
                 * empty match.  Do the same thing REOP_EMPTY would do.
                 */
                if (!result)
                    result = x;

                --gData->stateStackTop;
                op = (REOp) *pc++;
                continue;

              case REOP_LPAREN:
                pc = ReadCompactIndex(pc, &parenIndex);
                TRACE("[ %lu ]\n", (ULONG_PTR)parenIndex);
                assert(parenIndex < gData->regexp->parenCount);
                if (parenIndex + 1 > parenSoFar)
                    parenSoFar = parenIndex + 1;
                x->parens[parenIndex].index = x->cp - gData->cpbegin;
                x->parens[parenIndex].length = 0;
                op = (REOp) *pc++;
                continue;

              case REOP_RPAREN:
              {
                ptrdiff_t delta;

                pc = ReadCompactIndex(pc, &parenIndex);
                assert(parenIndex < gData->regexp->parenCount);
                cap = &x->parens[parenIndex];
                delta = x->cp - (gData->cpbegin + cap->index);
                cap->length = (delta < 0) ? 0 : (size_t) delta;
                op = (REOp) *pc++;

                if (!result)
                    result = x;
                continue;
              }
              case REOP_ASSERT:
                nextpc = pc + GET_OFFSET(pc);  /* start of term after ASSERT */
                pc += ARG_LEN;                 /* start of ASSERT child */
                op = (REOp) *pc++;
                testpc = pc;
                if (REOP_IS_SIMPLE(op) &&
                    !SimpleMatch(gData, x, op, &testpc, FALSE)) {
                    result = NULL;
                    break;
                }
                curState->u.assertion.top =
                    (char *)gData->backTrackSP - (char *)gData->backTrackStack;
                curState->u.assertion.sz = gData->cursz;
                curState->index = x->cp - gData->cpbegin;
                curState->parenSoFar = parenSoFar;
                PUSH_STATE_STACK(gData);
                if (!PushBackTrackState(gData, REOP_ASSERTTEST,
                                        nextpc, x, x->cp, 0, 0)) {
                    goto bad;
                }
                continue;

              case REOP_ASSERT_NOT:
                nextpc = pc + GET_OFFSET(pc);
                pc += ARG_LEN;
                op = (REOp) *pc++;
                testpc = pc;
                if (REOP_IS_SIMPLE(op) /* Note - fail to fail! */ &&
                    SimpleMatch(gData, x, op, &testpc, FALSE) &&
                    *testpc == REOP_ASSERTNOTTEST) {
                    result = NULL;
                    break;
                }
                curState->u.assertion.top
                    = (char *)gData->backTrackSP -
                      (char *)gData->backTrackStack;
                curState->u.assertion.sz = gData->cursz;
                curState->index = x->cp - gData->cpbegin;
                curState->parenSoFar = parenSoFar;
                PUSH_STATE_STACK(gData);
                if (!PushBackTrackState(gData, REOP_ASSERTNOTTEST,
                                        nextpc, x, x->cp, 0, 0)) {
                    goto bad;
                }
                continue;

              case REOP_ASSERTTEST:
                --gData->stateStackTop;
                --curState;
                x->cp = gData->cpbegin + curState->index;
                gData->backTrackSP =
                    (REBackTrackData *) ((char *)gData->backTrackStack +
                                         curState->u.assertion.top);
                gData->cursz = curState->u.assertion.sz;
                if (result)
                    result = x;
                break;

              case REOP_ASSERTNOTTEST:
                --gData->stateStackTop;
                --curState;
                x->cp = gData->cpbegin + curState->index;
                gData->backTrackSP =
                    (REBackTrackData *) ((char *)gData->backTrackStack +
                                         curState->u.assertion.top);
                gData->cursz = curState->u.assertion.sz;
                result = (!result) ? x : NULL;
                break;
              case REOP_STAR:
                curState->u.quantifier.min = 0;
                curState->u.quantifier.max = (UINT)-1;
                goto quantcommon;
              case REOP_PLUS:
                curState->u.quantifier.min = 1;
                curState->u.quantifier.max = (UINT)-1;
                goto quantcommon;
              case REOP_OPT:
                curState->u.quantifier.min = 0;
                curState->u.quantifier.max = 1;
                goto quantcommon;
              case REOP_QUANT:
                pc = ReadCompactIndex(pc, &k);
                curState->u.quantifier.min = k;
                pc = ReadCompactIndex(pc, &k);
                /* max is k - 1 to use one byte for (UINT)-1 sentinel. */
                curState->u.quantifier.max = k - 1;
                assert(curState->u.quantifier.min <= curState->u.quantifier.max);
              quantcommon:
                if (curState->u.quantifier.max == 0) {
                    pc = pc + GET_OFFSET(pc);
                    op = (REOp) *pc++;
                    result = x;
                    continue;
                }
                /* Step over <next> */
                nextpc = pc + ARG_LEN;
                op = (REOp) *nextpc++;
                startcp = x->cp;
                if (REOP_IS_SIMPLE(op)) {
                    if (!SimpleMatch(gData, x, op, &nextpc, TRUE)) {
                        if (curState->u.quantifier.min == 0)
                            result = x;
                        else
                            result = NULL;
                        pc = pc + GET_OFFSET(pc);
                        break;
                    }
                    op = (REOp) *nextpc++;
                    result = x;
                }
                curState->index = startcp - gData->cpbegin;
                curState->continue_op = REOP_REPEAT;
                curState->continue_pc = pc;
                curState->parenSoFar = parenSoFar;
                PUSH_STATE_STACK(gData);
                if (curState->u.quantifier.min == 0 &&
                    !PushBackTrackState(gData, REOP_REPEAT, pc, x, startcp,
                                        0, 0)) {
                    goto bad;
                }
                pc = nextpc;
                continue;

              case REOP_ENDCHILD: /* marks the end of a quantifier child */
                pc = curState[-1].continue_pc;
                op = (REOp) curState[-1].continue_op;

                if (!result)
                    result = x;
                continue;

              case REOP_REPEAT:
                --curState;
                do {
                    --gData->stateStackTop;
                    if (!result) {
                        /* Failed, see if we have enough children. */
                        if (curState->u.quantifier.min == 0)
                            goto repeatDone;
                        goto break_switch;
                    }
                    if (curState->u.quantifier.min == 0 &&
                        x->cp == gData->cpbegin + curState->index) {
                        /* matched an empty string, that'll get us nowhere */
                        result = NULL;
                        goto break_switch;
                    }
                    if (curState->u.quantifier.min != 0)
                        curState->u.quantifier.min--;
                    if (curState->u.quantifier.max != (UINT) -1)
                        curState->u.quantifier.max--;
                    if (curState->u.quantifier.max == 0)
                        goto repeatDone;
                    nextpc = pc + ARG_LEN;
                    nextop = (REOp) *nextpc;
                    startcp = x->cp;
                    if (REOP_IS_SIMPLE(nextop)) {
                        nextpc++;
                        if (!SimpleMatch(gData, x, nextop, &nextpc, TRUE)) {
                            if (curState->u.quantifier.min == 0)
                                goto repeatDone;
                            result = NULL;
                            goto break_switch;
                        }
                        result = x;
                    }
                    curState->index = startcp - gData->cpbegin;
                    PUSH_STATE_STACK(gData);
                    if (curState->u.quantifier.min == 0 &&
                        !PushBackTrackState(gData, REOP_REPEAT,
                                            pc, x, startcp,
                                            curState->parenSoFar,
                                            parenSoFar -
                                            curState->parenSoFar)) {
                        goto bad;
                    }
                } while (*nextpc == REOP_ENDCHILD);
                pc = nextpc;
                op = (REOp) *pc++;
                parenSoFar = curState->parenSoFar;
                continue;

              repeatDone:
                result = x;
                pc += GET_OFFSET(pc);
                goto break_switch;

              case REOP_MINIMALSTAR:
                curState->u.quantifier.min = 0;
                curState->u.quantifier.max = (UINT)-1;
                goto minimalquantcommon;
              case REOP_MINIMALPLUS:
                curState->u.quantifier.min = 1;
                curState->u.quantifier.max = (UINT)-1;
                goto minimalquantcommon;
              case REOP_MINIMALOPT:
                curState->u.quantifier.min = 0;
                curState->u.quantifier.max = 1;
                goto minimalquantcommon;
              case REOP_MINIMALQUANT:
                pc = ReadCompactIndex(pc, &k);
                curState->u.quantifier.min = k;
                pc = ReadCompactIndex(pc, &k);
                /* See REOP_QUANT comments about k - 1. */
                curState->u.quantifier.max = k - 1;
                assert(curState->u.quantifier.min
                          <= curState->u.quantifier.max);
              minimalquantcommon:
                curState->index = x->cp - gData->cpbegin;
                curState->parenSoFar = parenSoFar;
                PUSH_STATE_STACK(gData);
                if (curState->u.quantifier.min != 0) {
                    curState->continue_op = REOP_MINIMALREPEAT;
                    curState->continue_pc = pc;
                    /* step over <next> */
                    pc += OFFSET_LEN;
                    op = (REOp) *pc++;
                } else {
                    if (!PushBackTrackState(gData, REOP_MINIMALREPEAT,
                                            pc, x, x->cp, 0, 0)) {
                        goto bad;
                    }
                    --gData->stateStackTop;
                    pc = pc + GET_OFFSET(pc);
                    op = (REOp) *pc++;
                }
                continue;

              case REOP_MINIMALREPEAT:
                --gData->stateStackTop;
                --curState;

                TRACE("{%d,%d}\n", curState->u.quantifier.min, curState->u.quantifier.max);
#define PREPARE_REPEAT()                                                      \
    do {                                                                      \
        curState->index = x->cp - gData->cpbegin;                          \
        curState->continue_op = REOP_MINIMALREPEAT;                           \
        curState->continue_pc = pc;                                           \
        pc += ARG_LEN;                                                        \
        for (k = curState->parenSoFar; k < parenSoFar; k++)                   \
            x->parens[k].index = -1;                                          \
        PUSH_STATE_STACK(gData);                                              \
        op = (REOp) *pc++;                                                    \
        assert(op < REOP_LIMIT);                                              \
    }while(0)

                if (!result) {
                    TRACE(" -\n");
                    /*
                     * Non-greedy failure - try to consume another child.
                     */
                    if (curState->u.quantifier.max == (UINT) -1 ||
                        curState->u.quantifier.max > 0) {
                        PREPARE_REPEAT();
                        continue;
                    }
                    /* Don't need to adjust pc since we're going to pop. */
                    break;
                }
                if (curState->u.quantifier.min == 0 &&
                    x->cp == gData->cpbegin + curState->index) {
                    /* Matched an empty string, that'll get us nowhere. */
                    result = NULL;
                    break;
                }
                if (curState->u.quantifier.min != 0)
                    curState->u.quantifier.min--;
                if (curState->u.quantifier.max != (UINT) -1)
                    curState->u.quantifier.max--;
                if (curState->u.quantifier.min != 0) {
                    PREPARE_REPEAT();
                    continue;
                }
                curState->index = x->cp - gData->cpbegin;
                curState->parenSoFar = parenSoFar;
                PUSH_STATE_STACK(gData);
                if (!PushBackTrackState(gData, REOP_MINIMALREPEAT,
                                        pc, x, x->cp,
                                        curState->parenSoFar,
                                        parenSoFar - curState->parenSoFar)) {
                    goto bad;
                }
                --gData->stateStackTop;
                pc = pc + GET_OFFSET(pc);
                op = (REOp) *pc++;
                assert(op < REOP_LIMIT);
                continue;
              default:
                assert(FALSE);
                result = NULL;
            }
          break_switch:;
        }

        /*
         *  If the match failed and there's a backtrack option, take it.
         *  Otherwise this is a complete and utter failure.
         */
        if (!result) {
            if (gData->cursz == 0)
                return NULL;

            /* Potentially detect explosive regex here. */
            gData->backTrackCount++;
            if (gData->backTrackLimit &&
                gData->backTrackCount >= gData->backTrackLimit) {
                JS_ReportErrorNumber(gData->cx, js_GetErrorMessage, NULL,
                                     JSMSG_REGEXP_TOO_COMPLEX);
                gData->ok = FALSE;
                return NULL;
            }

            backTrackData = gData->backTrackSP;
            gData->cursz = backTrackData->sz;
            gData->backTrackSP =
                (REBackTrackData *) ((char *)backTrackData - backTrackData->sz);
            x->cp = backTrackData->cp;
            pc = backTrackData->backtrack_pc;
            op = (REOp) backTrackData->backtrack_op;
            assert(op < REOP_LIMIT);
            gData->stateStackTop = backTrackData->saveStateStackTop;
            assert(gData->stateStackTop);

            memcpy(gData->stateStack, backTrackData + 1,
                   sizeof(REProgState) * backTrackData->saveStateStackTop);
            curState = &gData->stateStack[gData->stateStackTop - 1];

            if (backTrackData->parenCount) {
                memcpy(&x->parens[backTrackData->parenIndex],
                       (char *)(backTrackData + 1) +
                       sizeof(REProgState) * backTrackData->saveStateStackTop,
                       sizeof(RECapture) * backTrackData->parenCount);
                parenSoFar = backTrackData->parenIndex + backTrackData->parenCount;
            } else {
                for (k = curState->parenSoFar; k < parenSoFar; k++)
                    x->parens[k].index = -1;
                parenSoFar = curState->parenSoFar;
            }

            TRACE("\tBT_Pop: %ld,%ld\n",
                     (ULONG_PTR)backTrackData->parenIndex,
                     (ULONG_PTR)backTrackData->parenCount);
            continue;
        }
        x = result;

        /*
         *  Continue with the expression.
         */
        op = (REOp)*pc++;
        assert(op < REOP_LIMIT);
    }

bad:
    TRACE("\n");
    return NULL;

good:
    TRACE("\n");
    return x;
}

Referenced by MatchRegExp().

FindParenCount()

static UINT FindParenCount ( CompilerState *  state )

static

Definition at line 906 of file regexp.c.

{
    CompilerState temp;
    int i;

    if (state->flags & JSREG_FIND_PAREN_COUNT)
        return OVERFLOW_VALUE;

    /*
     * Copy state into temp, flag it so we never report an invalid backref,
     * and reset its members to parse the entire regexp.  This is obviously
     * suboptimal, but GetDecimalValue calls us only if a backref appears to
     * refer to a forward parenthetical, which is rare.
     */
    temp = *state;
    temp.flags |= JSREG_FIND_PAREN_COUNT;
    temp.cp = temp.cpbegin;
    temp.parenCount = 0;
    temp.classCount = 0;
    temp.progLength = 0;
    temp.treeDepth = 0;
    temp.classBitmapsMem = 0;
    for (i = 0; i < CLASS_CACHE_SIZE; i++)
        temp.classCache[i].start = NULL;

    if (!ParseRegExp(&temp)) {
        state->flags |= JSREG_FIND_PAREN_ERROR;
        return OVERFLOW_VALUE;
    }
    return temp.parenCount;
}

Referenced by ParseTerm().

FlatNIMatcher()

static match_state_t* FlatNIMatcher ( REGlobalData *  gData, match_state_t *  x, const WCHAR *  matchChars, size_t  length  )

inlinestatic

Definition at line 1983 of file regexp.c.

{
    size_t i;
    assert(gData->cpend >= x->cp);
    if (length > (size_t)(gData->cpend - x->cp))
        return NULL;
    for (i = 0; i != length; i++) {
        if (towupper(matchChars[i]) != towupper(x->cp[i]))
            return NULL;
    }
    x->cp += length;
    return x;
}

Referenced by SimpleMatch().

GetCompactIndexWidth()

static size_t GetCompactIndexWidth ( size_t  index )

static

Definition at line 363 of file regexp.c.

{
    size_t width;

    for (width = 1; (index >>= 7) != 0; ++width) { }
    return width;
}

Referenced by EmitREBytecode(), ParseMinMaxQuantifier(), ParseRegExp(), ParseTerm(), and regexp_new().

GetDecimalValue()

static UINT GetDecimalValue ( WCHAR  c, UINT  max, UINT(*)(CompilerState *state)  findMax, CompilerState *  state  )

static

Definition at line 945 of file regexp.c.

{
    UINT value = JS7_UNDEC(c);
    BOOL overflow = (value > max && (!findMax || value > findMax(state)));

    /* The following restriction allows simpler overflow checks. */
    assert(max <= ((UINT)-1 - 9) / 10);
    while (state->cp < state->cpend) {
        c = *state->cp;
        if (!JS7_ISDEC(c))
            break;
        value = 10 * value + JS7_UNDEC(c);
        if (!overflow && value > max && (!findMax || value > findMax(state)))
            overflow = TRUE;
        ++state->cp;
    }
    return overflow ? OVERFLOW_VALUE : value;
}

Referenced by ParseMinMaxQuantifier(), and ParseTerm().

InitMatch()

static HRESULT InitMatch ( regexp_t *  re, void *  cx, heap_pool_t *  pool, REGlobalData *  gData  )

static

Definition at line 3100 of file regexp.c.

{
    UINT i;

    gData->backTrackStackSize = INITIAL_BACKTRACK;
    gData->backTrackStack = heap_pool_alloc(gData->pool, INITIAL_BACKTRACK);
    if (!gData->backTrackStack)
        goto bad;

    gData->backTrackSP = gData->backTrackStack;
    gData->cursz = 0;
    gData->backTrackCount = 0;
    gData->backTrackLimit = 0;

    gData->stateStackLimit = INITIAL_STATESTACK;
    gData->stateStack = heap_pool_alloc(gData->pool, sizeof(REProgState) * INITIAL_STATESTACK);
    if (!gData->stateStack)
        goto bad;

    gData->stateStackTop = 0;
    gData->cx = cx;
    gData->pool = pool;
    gData->regexp = re;
    gData->ok = TRUE;

    for (i = 0; i < re->classCount; i++) {
        if (!re->classList[i].converted &&
                !ProcessCharSet(gData, &re->classList[i])) {
            return E_FAIL;
        }
    }

    return S_OK;

bad:
    js_ReportOutOfScriptQuota(cx);
    gData->ok = FALSE;
    return E_OUTOFMEMORY;
}

Referenced by regexp_execute().

isASCIIHexDigit()

static BOOL isASCIIHexDigit ( WCHAR  c, UINT *  digit  )

static

Definition at line 428 of file regexp.c.

{
    UINT cv = c;

    if (cv < '0')
        return FALSE;
    if (cv <= '9') {
        *digit = cv - '0';
        return TRUE;
    }
    cv |= 0x20;
    if (cv >= 'a' && cv <= 'f') {
        *digit = cv - 'a' + 10;
        return TRUE;
    }
    return FALSE;
}

Referenced by CalculateBitmapSize(), ParseTerm(), and ProcessCharSet().

MatchRegExp()

static match_state_t* MatchRegExp ( REGlobalData *  gData, match_state_t *  x  )

static

Definition at line 3073 of file regexp.c.

{
    match_state_t *result;
    const WCHAR *cp = x->cp;
    const WCHAR *cp2;
    UINT j;

    /*
     * Have to include the position beyond the last character
     * in order to detect end-of-input/line condition.
     */
    for (cp2 = cp; cp2 <= gData->cpend; cp2++) {
        gData->skipped = cp2 - cp;
        x->cp = cp2;
        for (j = 0; j < gData->regexp->parenCount; j++)
            x->parens[j].index = -1;
        result = ExecuteREBytecode(gData, x);
        if (!gData->ok || result || (gData->regexp->flags & REG_STICKY))
            return result;
        gData->backTrackSP = gData->backTrackStack;
        gData->cursz = 0;
        gData->stateStackTop = 0;
        cp2 = cp + gData->skipped;
    }
    return NULL;
}

Referenced by regexp_execute().

NewRENode()

static RENode* NewRENode ( CompilerState *  state, REOp  op  )

static

Definition at line 409 of file regexp.c.

{
    RENode *ren;

    ren = heap_pool_alloc(state->pool, sizeof(*ren));
    if (!ren) {
        /* js_ReportOutOfScriptQuota(cx); */
        return NULL;
    }
    ren->op = op;
    ren->next = NULL;
    ren->kid = NULL;
    return ren;
}

Referenced by ParseMinMaxQuantifier(), ParseQuantifier(), ParseRegExp(), ParseTerm(), ProcessOp(), and regexp_new().

ParseMinMaxQuantifier()

static INT ParseMinMaxQuantifier ( CompilerState *  state, BOOL  ignoreValues  )

static

Definition at line 1163 of file regexp.c.

{
    UINT min, max;
    WCHAR c;
    const WCHAR *errp = state->cp++;

    c = *state->cp;
    if (JS7_ISDEC(c)) {
        ++state->cp;
        min = GetDecimalValue(c, 0xFFFF, NULL, state);
        c = *state->cp;

        if (!ignoreValues && min == OVERFLOW_VALUE)
            return JSMSG_MIN_TOO_BIG;

        if (c == ',') {
            c = *++state->cp;
            if (JS7_ISDEC(c)) {
                ++state->cp;
                max = GetDecimalValue(c, 0xFFFF, NULL, state);
                c = *state->cp;
                if (!ignoreValues && max == OVERFLOW_VALUE)
                    return JSMSG_MAX_TOO_BIG;
                if (!ignoreValues && min > max)
                    return JSMSG_OUT_OF_ORDER;
            } else {
                max = (UINT)-1;
            }
        } else {
            max = min;
        }
        if (c == '}') {
            state->result = NewRENode(state, REOP_QUANT);
            if (!state->result)
                return JSMSG_OUT_OF_MEMORY;
            state->result->u.range.min = min;
            state->result->u.range.max = max;
            /*
             * QUANT, <min>, <max>, <next> ... <ENDCHILD>
             * where <max> is written as compact(max+1) to make
             * (UINT)-1 sentinel to occupy 1 byte, not width_of(max)+1.
             */
            state->progLength += (1 + GetCompactIndexWidth(min)
                                  + GetCompactIndexWidth(max + 1)
                                  +3);
            return 0;
        }
    }

    state->cp = errp;
    return -1;
}

Referenced by ParseQuantifier(), ParseRegExp(), and ParseTerm().

ParseQuantifier()

static BOOL ParseQuantifier ( CompilerState *  state )

static

Definition at line 1217 of file regexp.c.

{
    RENode *term;
    term = state->result;
    if (state->cp < state->cpend) {
        switch (*state->cp) {
          case '+':
            state->result = NewRENode(state, REOP_QUANT);
            if (!state->result)
                return FALSE;
            state->result->u.range.min = 1;
            state->result->u.range.max = (UINT)-1;
            /* <PLUS>, <next> ... <ENDCHILD> */
            state->progLength += 4;
            goto quantifier;
          case '*':
            state->result = NewRENode(state, REOP_QUANT);
            if (!state->result)
                return FALSE;
            state->result->u.range.min = 0;
            state->result->u.range.max = (UINT)-1;
            /* <STAR>, <next> ... <ENDCHILD> */
            state->progLength += 4;
            goto quantifier;
          case '?':
            state->result = NewRENode(state, REOP_QUANT);
            if (!state->result)
                return FALSE;
            state->result->u.range.min = 0;
            state->result->u.range.max = 1;
            /* <OPT>, <next> ... <ENDCHILD> */
            state->progLength += 4;
            goto quantifier;
          case '{':       /* balance '}' */
          {
            INT err;

            err = ParseMinMaxQuantifier(state, FALSE);
            if (err == 0)
                goto quantifier;
            if (err == -1)
                return TRUE;

            ReportRegExpErrorHelper(state, JSREPORT_ERROR, err, errp);
            return FALSE;
          }
          default:;
        }
    }
    return TRUE;

quantifier:
    if (state->treeDepth == TREE_DEPTH_MAX) {
        ReportRegExpError(state, JSREPORT_ERROR, JSMSG_REGEXP_TOO_COMPLEX);
        return FALSE;
    }

    ++state->treeDepth;
    ++state->cp;
    state->result->kid = term;
    if (state->cp < state->cpend && *state->cp == '?') {
        ++state->cp;
        state->result->u.range.greedy = FALSE;
    } else {
        state->result->u.range.greedy = TRUE;
    }
    return TRUE;
}

Referenced by ParseRegExp(), and ParseTerm().

ParseRegExp()

static BOOL ParseRegExp ( CompilerState *  state )

static

Definition at line 1651 of file regexp.c.

{
    size_t parenIndex;
    RENode *operand;
    REOpData *operatorStack;
    RENode **operandStack;
    REOp op;
    INT i;
    BOOL result = FALSE;

    INT operatorSP = 0, operatorStackSize = INITIAL_STACK_SIZE;
    INT operandSP = 0, operandStackSize = INITIAL_STACK_SIZE;

    /* Watch out for empty regexp */
    if (state->cp == state->cpend) {
        state->result = NewRENode(state, REOP_EMPTY);
        return (state->result != NULL);
    }

    operatorStack = heap_alloc(sizeof(REOpData) * operatorStackSize);
    if (!operatorStack)
        return FALSE;

    operandStack = heap_alloc(sizeof(RENode *) * operandStackSize);
    if (!operandStack)
        goto out;

    for (;;) {
        parenIndex = state->parenCount;
        if (state->cp == state->cpend) {
            /*
             * If we are at the end of the regexp and we're short one or more
             * operands, the regexp must have the form /x|/ or some such, with
             * left parentheses making us short more than one operand.
             */
            if (operatorSP >= operandSP) {
                operand = NewRENode(state, REOP_EMPTY);
                if (!operand)
                    goto out;
                goto pushOperand;
            }
        } else {
            switch (*state->cp) {
              case '(':
                ++state->cp;
                if (state->cp + 1 < state->cpend &&
                    *state->cp == '?' &&
                    (state->cp[1] == '=' ||
                     state->cp[1] == '!' ||
                     state->cp[1] == ':')) {
                    switch (state->cp[1]) {
                      case '=':
                        op = REOP_ASSERT;
                        /* ASSERT, <next>, ... ASSERTTEST */
                        state->progLength += 4;
                        break;
                      case '!':
                        op = REOP_ASSERT_NOT;
                        /* ASSERTNOT, <next>, ... ASSERTNOTTEST */
                        state->progLength += 4;
                        break;
                      default:
                        op = REOP_LPARENNON;
                        break;
                    }
                    state->cp += 2;
                } else {
                    op = REOP_LPAREN;
                    /* LPAREN, <index>, ... RPAREN, <index> */
                    state->progLength
                        += 2 * (1 + GetCompactIndexWidth(parenIndex));
                    state->parenCount++;
                    if (state->parenCount == 65535) {
                        ReportRegExpError(state, JSREPORT_ERROR,
                                          JSMSG_TOO_MANY_PARENS);
                        goto out;
                    }
                }
                goto pushOperator;

              case ')':
                /*
                 * If there's no stacked open parenthesis, throw syntax error.
                 */
                for (i = operatorSP - 1; ; i--) {
                    if (i < 0) {
                        ReportRegExpError(state, JSREPORT_ERROR,
                                          JSMSG_UNMATCHED_RIGHT_PAREN);
                        goto out;
                    }
                    if (operatorStack[i].op == REOP_ASSERT ||
                        operatorStack[i].op == REOP_ASSERT_NOT ||
                        operatorStack[i].op == REOP_LPARENNON ||
                        operatorStack[i].op == REOP_LPAREN) {
                        break;
                    }
                }
                /* FALL THROUGH */

              case '|':
                /* Expected an operand before these, so make an empty one */
                operand = NewRENode(state, REOP_EMPTY);
                if (!operand)
                    goto out;
                goto pushOperand;

              default:
                if (!ParseTerm(state))
                    goto out;
                operand = state->result;
pushOperand:
                if (operandSP == operandStackSize) {
                    RENode **tmp;
                    operandStackSize += operandStackSize;
                    tmp = heap_realloc(operandStack, sizeof(RENode *) * operandStackSize);
                    if (!tmp)
                        goto out;
                    operandStack = tmp;
                }
                operandStack[operandSP++] = operand;
                break;
            }
        }

        /* At the end; process remaining operators. */
restartOperator:
        if (state->cp == state->cpend) {
            while (operatorSP) {
                --operatorSP;
                if (!ProcessOp(state, &operatorStack[operatorSP],
                               operandStack, operandSP))
                    goto out;
                --operandSP;
            }
            assert(operandSP == 1);
            state->result = operandStack[0];
            result = TRUE;
            goto out;
        }

        switch (*state->cp) {
          case '|':
            /* Process any stacked 'concat' operators */
            ++state->cp;
            while (operatorSP &&
                   operatorStack[operatorSP - 1].op == REOP_CONCAT) {
                --operatorSP;
                if (!ProcessOp(state, &operatorStack[operatorSP],
                               operandStack, operandSP)) {
                    goto out;
                }
                --operandSP;
            }
            op = REOP_ALT;
            goto pushOperator;

          case ')':
            /*
             * If there's no stacked open parenthesis, throw syntax error.
             */
            for (i = operatorSP - 1; ; i--) {
                if (i < 0) {
                    ReportRegExpError(state, JSREPORT_ERROR,
                                      JSMSG_UNMATCHED_RIGHT_PAREN);
                    goto out;
                }
                if (operatorStack[i].op == REOP_ASSERT ||
                    operatorStack[i].op == REOP_ASSERT_NOT ||
                    operatorStack[i].op == REOP_LPARENNON ||
                    operatorStack[i].op == REOP_LPAREN) {
                    break;
                }
            }
            ++state->cp;

            /* Process everything on the stack until the open parenthesis. */
            for (;;) {
                assert(operatorSP);
                --operatorSP;
                switch (operatorStack[operatorSP].op) {
                  case REOP_ASSERT:
                  case REOP_ASSERT_NOT:
                  case REOP_LPAREN:
                    operand = NewRENode(state, operatorStack[operatorSP].op);
                    if (!operand)
                        goto out;
                    operand->u.parenIndex =
                        operatorStack[operatorSP].parenIndex;
                    assert(operandSP);
                    operand->kid = operandStack[operandSP - 1];
                    operandStack[operandSP - 1] = operand;
                    if (state->treeDepth == TREE_DEPTH_MAX) {
                        ReportRegExpError(state, JSREPORT_ERROR,
                                          JSMSG_REGEXP_TOO_COMPLEX);
                        goto out;
                    }
                    ++state->treeDepth;
                    /* FALL THROUGH */

                  case REOP_LPARENNON:
                    state->result = operandStack[operandSP - 1];
                    if (!ParseQuantifier(state))
                        goto out;
                    operandStack[operandSP - 1] = state->result;
                    goto restartOperator;
                  default:
                    if (!ProcessOp(state, &operatorStack[operatorSP],
                                   operandStack, operandSP))
                        goto out;
                    --operandSP;
                    break;
                }
            }
            break;

          case '{':
          {
            const WCHAR *errp = state->cp;

            if (ParseMinMaxQuantifier(state, TRUE) < 0) {
                /*
                 * This didn't even scan correctly as a quantifier, so we should
                 * treat it as flat.
                 */
                op = REOP_CONCAT;
                goto pushOperator;
            }

            state->cp = errp;
            /* FALL THROUGH */
          }

          case '+':
          case '*':
          case '?':
            ReportRegExpErrorHelper(state, JSREPORT_ERROR, JSMSG_BAD_QUANTIFIER,
                                    state->cp);
            result = FALSE;
            goto out;

          default:
            /* Anything else is the start of the next term. */
            op = REOP_CONCAT;
pushOperator:
            if (operatorSP == operatorStackSize) {
                REOpData *tmp;
                operatorStackSize += operatorStackSize;
                tmp = heap_realloc(operatorStack, sizeof(REOpData) * operatorStackSize);
                if (!tmp)
                    goto out;
                operatorStack = tmp;
            }
            operatorStack[operatorSP].op = op;
            operatorStack[operatorSP].errPos = state->cp;
            operatorStack[operatorSP++].parenIndex = parenIndex;
            break;
        }
    }
out:
    heap_free(operatorStack);
    heap_free(operandStack);
    return result;
}

Referenced by FindParenCount(), and regexp_new().

ParseTerm()

static BOOL ParseTerm ( CompilerState *  state )

static

Definition at line 1341 of file regexp.c.

{
    WCHAR c = *state->cp++;
    UINT nDigits;
    UINT num, tmp, n, i;
    const WCHAR *termStart;

    switch (c) {
    /* assertions and atoms */
      case '^':
        state->result = NewRENode(state, REOP_BOL);
        if (!state->result)
            return FALSE;
        state->progLength++;
        return TRUE;
      case '$':
        state->result = NewRENode(state, REOP_EOL);
        if (!state->result)
            return FALSE;
        state->progLength++;
        return TRUE;
      case '\\':
        if (state->cp >= state->cpend) {
            /* a trailing '\' is an error */
            ReportRegExpError(state, JSREPORT_ERROR, JSMSG_TRAILING_SLASH);
            return FALSE;
        }
        c = *state->cp++;
        switch (c) {
        /* assertion escapes */
          case 'b' :
            state->result = NewRENode(state, REOP_WBDRY);
            if (!state->result)
                return FALSE;
            state->progLength++;
            return TRUE;
          case 'B':
            state->result = NewRENode(state, REOP_WNONBDRY);
            if (!state->result)
                return FALSE;
            state->progLength++;
            return TRUE;
          /* Decimal escape */
          case '0':
              /* Give a strict warning. See also the note below. */
              WARN("non-octal digit in an escape sequence that doesn't match a back-reference\n");
     doOctal:
            num = 0;
            while (state->cp < state->cpend) {
                c = *state->cp;
                if (c < '0' || '7' < c)
                    break;
                state->cp++;
                tmp = 8 * num + (UINT)JS7_UNDEC(c);
                if (tmp > 0377)
                    break;
                num = tmp;
            }
            c = (WCHAR)num;
    doFlat:
            state->result = NewRENode(state, REOP_FLAT);
            if (!state->result)
                return FALSE;
            state->result->u.flat.chr = c;
            state->result->u.flat.length = 1;
            state->progLength += 3;
            break;
          case '1':
          case '2':
          case '3':
          case '4':
          case '5':
          case '6':
          case '7':
          case '8':
          case '9':
            termStart = state->cp - 1;
            num = GetDecimalValue(c, state->parenCount, FindParenCount, state);
            if (state->flags & JSREG_FIND_PAREN_ERROR)
                return FALSE;
            if (num == OVERFLOW_VALUE) {
                /* Give a strict mode warning. */
                WARN("back-reference exceeds number of capturing parentheses\n");

                /*
                 * Note: ECMA 262, 15.10.2.9 says that we should throw a syntax
                 * error here. However, for compatibility with IE, we treat the
                 * whole backref as flat if the first character in it is not a
                 * valid octal character, and as an octal escape otherwise.
                 */
                state->cp = termStart;
                if (c >= '8') {
                    /* Treat this as flat. termStart - 1 is the \. */
                    c = '\\';
                    goto asFlat;
                }

                /* Treat this as an octal escape. */
                goto doOctal;
            }
            assert(1 <= num && num <= 0x10000);
            state->result = NewRENode(state, REOP_BACKREF);
            if (!state->result)
                return FALSE;
            state->result->u.parenIndex = num - 1;
            state->progLength
                += 1 + GetCompactIndexWidth(state->result->u.parenIndex);
            break;
          /* Control escape */
          case 'f':
            c = 0xC;
            goto doFlat;
          case 'n':
            c = 0xA;
            goto doFlat;
          case 'r':
            c = 0xD;
            goto doFlat;
          case 't':
            c = 0x9;
            goto doFlat;
          case 'v':
            c = 0xB;
            goto doFlat;
          /* Control letter */
          case 'c':
            if (state->cp < state->cpend && RE_IS_LETTER(*state->cp)) {
                c = (WCHAR) (*state->cp++ & 0x1F);
            } else {
                /* back off to accepting the original '\' as a literal */
                --state->cp;
                c = '\\';
            }
            goto doFlat;
          /* HexEscapeSequence */
          case 'x':
            nDigits = 2;
            goto lexHex;
          /* UnicodeEscapeSequence */
          case 'u':
            nDigits = 4;
lexHex:
            n = 0;
            for (i = 0; i < nDigits && state->cp < state->cpend; i++) {
                UINT digit;
                c = *state->cp++;
                if (!isASCIIHexDigit(c, &digit)) {
                    /*
                     * Back off to accepting the original 'u' or 'x' as a
                     * literal.
                     */
                    state->cp -= i + 2;
                    n = *state->cp++;
                    break;
                }
                n = (n << 4) | digit;
            }
            c = (WCHAR) n;
            goto doFlat;
          /* Character class escapes */
          case 'd':
            state->result = NewRENode(state, REOP_DIGIT);
doSimple:
            if (!state->result)
                return FALSE;
            state->progLength++;
            break;
          case 'D':
            state->result = NewRENode(state, REOP_NONDIGIT);
            goto doSimple;
          case 's':
            state->result = NewRENode(state, REOP_SPACE);
            goto doSimple;
          case 'S':
            state->result = NewRENode(state, REOP_NONSPACE);
            goto doSimple;
          case 'w':
            state->result = NewRENode(state, REOP_ALNUM);
            goto doSimple;
          case 'W':
            state->result = NewRENode(state, REOP_NONALNUM);
            goto doSimple;
          /* IdentityEscape */
          default:
            state->result = NewRENode(state, REOP_FLAT);
            if (!state->result)
                return FALSE;
            state->result->u.flat.chr = c;
            state->result->u.flat.length = 1;
            state->result->kid = (void *) (state->cp - 1);
            state->progLength += 3;
            break;
        }
        break;
      case '[':
        state->result = NewRENode(state, REOP_CLASS);
        if (!state->result)
            return FALSE;
        termStart = state->cp;
        state->result->u.ucclass.startIndex = termStart - state->cpbegin;
        for (;;) {
            if (state->cp == state->cpend) {
                ReportRegExpErrorHelper(state, JSREPORT_ERROR,
                                        JSMSG_UNTERM_CLASS, termStart);

                return FALSE;
            }
            if (*state->cp == '\\') {
                state->cp++;
                if (state->cp != state->cpend)
                    state->cp++;
                continue;
            }
            if (*state->cp == ']') {
                state->result->u.ucclass.kidlen = state->cp - termStart;
                break;
            }
            state->cp++;
        }
        for (i = 0; i < CLASS_CACHE_SIZE; i++) {
            if (!state->classCache[i].start) {
                state->classCache[i].start = termStart;
                state->classCache[i].length = state->result->u.ucclass.kidlen;
                state->classCache[i].index = state->classCount;
                break;
            }
            if (state->classCache[i].length ==
                state->result->u.ucclass.kidlen) {
                for (n = 0; ; n++) {
                    if (n == state->classCache[i].length) {
                        state->result->u.ucclass.index
                            = state->classCache[i].index;
                        goto claim;
                    }
                    if (state->classCache[i].start[n] != termStart[n])
                        break;
                }
            }
        }
        state->result->u.ucclass.index = state->classCount++;

    claim:
        /*
         * Call CalculateBitmapSize now as we want any errors it finds
         * to be reported during the parse phase, not at execution.
         */
        if (!CalculateBitmapSize(state, state->result, termStart, state->cp++))
            return FALSE;
        /*
         * Update classBitmapsMem with number of bytes to hold bmsize bits,
         * which is (bitsCount + 7) / 8 or (highest_bit + 1 + 7) / 8
         * or highest_bit / 8 + 1 where highest_bit is u.ucclass.bmsize.
         */
        n = (state->result->u.ucclass.bmsize >> 3) + 1;
        if (n > CLASS_BITMAPS_MEM_LIMIT - state->classBitmapsMem) {
            ReportRegExpError(state, JSREPORT_ERROR, JSMSG_REGEXP_TOO_COMPLEX);
            return FALSE;
        }
        state->classBitmapsMem += n;
        /* CLASS, <index> */
        state->progLength
            += 1 + GetCompactIndexWidth(state->result->u.ucclass.index);
        break;

      case '.':
        state->result = NewRENode(state, REOP_DOT);
        goto doSimple;

      case '{':
      {
        const WCHAR *errp = state->cp--;
        INT err;

        err = ParseMinMaxQuantifier(state, TRUE);
        state->cp = errp;

        if (err < 0)
            goto asFlat;

        /* FALL THROUGH */
      }
      case '*':
      case '+':
      case '?':
        ReportRegExpErrorHelper(state, JSREPORT_ERROR,
                                JSMSG_BAD_QUANTIFIER, state->cp - 1);
        return FALSE;
      default:
asFlat:
        state->result = NewRENode(state, REOP_FLAT);
        if (!state->result)
            return FALSE;
        state->result->u.flat.chr = c;
        state->result->u.flat.length = 1;
        state->result->kid = (void *) (state->cp - 1);
        state->progLength += 3;
        break;
    }
    return ParseQuantifier(state);
}

Referenced by ParseRegExp().

ProcessCharSet()

static BOOL ProcessCharSet ( REGlobalData *  gData, RECharSet *  charSet  )

static

Definition at line 2087 of file regexp.c.

{
    const WCHAR *src, *end;
    BOOL inRange = FALSE;
    WCHAR rangeStart = 0;
    UINT byteLength, n;
    WCHAR c, thisCh;
    INT nDigits, i;

    assert(!charSet->converted);
    /*
     * Assert that startIndex and length points to chars inside [] inside
     * source string.
     */
    assert(1 <= charSet->u.src.startIndex);
    assert(charSet->u.src.startIndex < gData->regexp->source_len);
    assert(charSet->u.src.length <= gData->regexp->source_len
            - 1 - charSet->u.src.startIndex);

    charSet->converted = TRUE;
    src = gData->regexp->source + charSet->u.src.startIndex;

    end = src + charSet->u.src.length;

    assert(src[-1] == '[' && end[0] == ']');

    byteLength = (charSet->length >> 3) + 1;
    charSet->u.bits = heap_alloc(byteLength);
    if (!charSet->u.bits) {
        JS_ReportOutOfMemory(gData->cx);
        gData->ok = FALSE;
        return FALSE;
    }
    memset(charSet->u.bits, 0, byteLength);

    if (src == end)
        return TRUE;

    if (*src == '^') {
        assert(charSet->sense == FALSE);
        ++src;
    } else {
        assert(charSet->sense == TRUE);
    }

    while (src != end) {
        switch (*src) {
          case '\\':
            ++src;
            c = *src++;
            switch (c) {
              case 'b':
                thisCh = 0x8;
                break;
              case 'f':
                thisCh = 0xC;
                break;
              case 'n':
                thisCh = 0xA;
                break;
              case 'r':
                thisCh = 0xD;
                break;
              case 't':
                thisCh = 0x9;
                break;
              case 'v':
                thisCh = 0xB;
                break;
              case 'c':
                if (src < end && JS_ISWORD(*src)) {
                    thisCh = (WCHAR)(*src++ & 0x1F);
                } else {
                    --src;
                    thisCh = '\\';
                }
                break;
              case 'x':
                nDigits = 2;
                goto lexHex;
              case 'u':
                nDigits = 4;
            lexHex:
                n = 0;
                for (i = 0; (i < nDigits) && (src < end); i++) {
                    UINT digit;
                    c = *src++;
                    if (!isASCIIHexDigit(c, &digit)) {
                        /*
                         * Back off to accepting the original '\'
                         * as a literal
                         */
                        src -= i + 1;
                        n = '\\';
                        break;
                    }
                    n = (n << 4) | digit;
                }
                thisCh = (WCHAR)n;
                break;
              case '0':
              case '1':
              case '2':
              case '3':
              case '4':
              case '5':
              case '6':
              case '7':
                /*
                 *  This is a non-ECMA extension - decimal escapes (in this
                 *  case, octal!) are supposed to be an error inside class
                 *  ranges, but supported here for backwards compatibility.
                 */
                n = JS7_UNDEC(c);
                c = *src;
                if ('0' <= c && c <= '7') {
                    src++;
                    n = 8 * n + JS7_UNDEC(c);
                    c = *src;
                    if ('0' <= c && c <= '7') {
                        src++;
                        i = 8 * n + JS7_UNDEC(c);
                        if (i <= 0377)
                            n = i;
                        else
                            src--;
                    }
                }
                thisCh = (WCHAR)n;
                break;

              case 'd':
                AddCharacterRangeToCharSet(charSet, '0', '9');
                continue;   /* don't need range processing */
              case 'D':
                AddCharacterRangeToCharSet(charSet, 0, '0' - 1);
                AddCharacterRangeToCharSet(charSet,
                                           (WCHAR)('9' + 1),
                                           (WCHAR)charSet->length);
                continue;
              case 's':
                for (i = (INT)charSet->length; i >= 0; i--)
                    if (iswspace(i))
                        AddCharacterToCharSet(charSet, (WCHAR)i);
                continue;
              case 'S':
                for (i = (INT)charSet->length; i >= 0; i--)
                    if (!iswspace(i))
                        AddCharacterToCharSet(charSet, (WCHAR)i);
                continue;
              case 'w':
                for (i = (INT)charSet->length; i >= 0; i--)
                    if (JS_ISWORD(i))
                        AddCharacterToCharSet(charSet, (WCHAR)i);
                continue;
              case 'W':
                for (i = (INT)charSet->length; i >= 0; i--)
                    if (!JS_ISWORD(i))
                        AddCharacterToCharSet(charSet, (WCHAR)i);
                continue;
              default:
                thisCh = c;
                break;

            }
            break;

          default:
            thisCh = *src++;
            break;

        }
        if (inRange) {
            if (gData->regexp->flags & REG_FOLD) {
                assert(rangeStart <= thisCh);
                for (i = rangeStart; i <= thisCh; i++) {
                    WCHAR uch, dch;

                    AddCharacterToCharSet(charSet, i);
                    uch = towupper(i);
                    dch = towlower(i);
                    if (i != uch)
                        AddCharacterToCharSet(charSet, uch);
                    if (i != dch)
                        AddCharacterToCharSet(charSet, dch);
                }
            } else {
                AddCharacterRangeToCharSet(charSet, rangeStart, thisCh);
            }
            inRange = FALSE;
        } else {
            if (gData->regexp->flags & REG_FOLD) {
                AddCharacterToCharSet(charSet, towupper(thisCh));
                AddCharacterToCharSet(charSet, towlower(thisCh));
            } else {
                AddCharacterToCharSet(charSet, thisCh);
            }
            if (src < end - 1) {
                if (*src == '-') {
                    ++src;
                    inRange = TRUE;
                    rangeStart = thisCh;
                }
            }
        }
    }
    return TRUE;
}

Referenced by ExecuteREBytecode(), and InitMatch().

ProcessOp()

static BOOL ProcessOp ( CompilerState *  state, REOpData *  opData, RENode **  operandStack, INT  operandSP  )

static

Definition at line 805 of file regexp.c.

{
    RENode *result;

    switch (opData->op) {
      case REOP_ALT:
        result = NewRENode(state, REOP_ALT);
        if (!result)
            return FALSE;
        result->kid = operandStack[operandSP - 2];
        result->u.kid2 = operandStack[operandSP - 1];
        operandStack[operandSP - 2] = result;

        if (state->treeDepth == TREE_DEPTH_MAX) {
            ReportRegExpError(state, JSREPORT_ERROR, JSMSG_REGEXP_TOO_COMPLEX);
            return FALSE;
        }
        ++state->treeDepth;

        /*
         * Look at both alternates to see if there's a FLAT or a CLASS at
         * the start of each. If so, use a prerequisite match.
         */
        if (((RENode *) result->kid)->op == REOP_FLAT &&
            ((RENode *) result->u.kid2)->op == REOP_FLAT &&
            (state->flags & REG_FOLD) == 0) {
            result->op = REOP_ALTPREREQ;
            result->u.altprereq.ch1 = ((RENode *) result->kid)->u.flat.chr;
            result->u.altprereq.ch2 = ((RENode *) result->u.kid2)->u.flat.chr;
            /* ALTPREREQ, <end>, uch1, uch2, <next>, ...,
                                            JUMP, <end> ... ENDALT */
            state->progLength += 13;
        }
        else
        if (((RENode *) result->kid)->op == REOP_CLASS &&
            ((RENode *) result->kid)->u.ucclass.index < 256 &&
            ((RENode *) result->u.kid2)->op == REOP_FLAT &&
            (state->flags & REG_FOLD) == 0) {
            result->op = REOP_ALTPREREQ2;
            result->u.altprereq.ch1 = ((RENode *) result->u.kid2)->u.flat.chr;
            result->u.altprereq.ch2 = ((RENode *) result->kid)->u.ucclass.index;
            /* ALTPREREQ2, <end>, uch1, uch2, <next>, ...,
                                            JUMP, <end> ... ENDALT */
            state->progLength += 13;
        }
        else
        if (((RENode *) result->kid)->op == REOP_FLAT &&
            ((RENode *) result->u.kid2)->op == REOP_CLASS &&
            ((RENode *) result->u.kid2)->u.ucclass.index < 256 &&
            (state->flags & REG_FOLD) == 0) {
            result->op = REOP_ALTPREREQ2;
            result->u.altprereq.ch1 = ((RENode *) result->kid)->u.flat.chr;
            result->u.altprereq.ch2 =
                ((RENode *) result->u.kid2)->u.ucclass.index;
            /* ALTPREREQ2, <end>, uch1, uch2, <next>, ...,
                                          JUMP, <end> ... ENDALT */
            state->progLength += 13;
        }
        else {
            /* ALT, <next>, ..., JUMP, <end> ... ENDALT */
            state->progLength += 7;
        }
        break;

      case REOP_CONCAT:
        result = operandStack[operandSP - 2];
        while (result->next)
            result = result->next;
        result->next = operandStack[operandSP - 1];
        break;

      case REOP_ASSERT:
      case REOP_ASSERT_NOT:
      case REOP_LPARENNON:
      case REOP_LPAREN:
        /* These should have been processed by a close paren. */
        ReportRegExpErrorHelper(state, JSREPORT_ERROR, JSMSG_MISSING_PAREN,
                                opData->errPos);
        return FALSE;

      default:;
    }
    return TRUE;
}

Referenced by ParseRegExp().

PushBackTrackState()

static REBackTrackData* PushBackTrackState ( REGlobalData *  gData, REOp  op, jsbytecode *  target, match_state_t *  x, const WCHAR *  cp, size_t  parenIndex, size_t  parenCount  )

static

Definition at line 1922 of file regexp.c.

{
    size_t i;
    REBackTrackData *result =
        (REBackTrackData *) ((char *)gData->backTrackSP + gData->cursz);

    size_t sz = sizeof(REBackTrackData) +
                gData->stateStackTop * sizeof(REProgState) +
                parenCount * sizeof(RECapture);

    ptrdiff_t btsize = gData->backTrackStackSize;
    ptrdiff_t btincr = ((char *)result + sz) -
                       ((char *)gData->backTrackStack + btsize);

    TRACE("\tBT_Push: %lu,%lu\n", (ULONG_PTR)parenIndex, (ULONG_PTR)parenCount);

    JS_COUNT_OPERATION(gData->cx, JSOW_JUMP * (1 + parenCount));
    if (btincr > 0) {
        ptrdiff_t offset = (char *)result - (char *)gData->backTrackStack;

        JS_COUNT_OPERATION(gData->cx, JSOW_ALLOCATION);
        btincr = ((btincr+btsize-1)/btsize)*btsize;
        gData->backTrackStack = heap_pool_grow(gData->pool, gData->backTrackStack, btsize, btincr);
        if (!gData->backTrackStack) {
            js_ReportOutOfScriptQuota(gData->cx);
            gData->ok = FALSE;
            return NULL;
        }
        gData->backTrackStackSize = btsize + btincr;
        result = (REBackTrackData *) ((char *)gData->backTrackStack + offset);
    }
    gData->backTrackSP = result;
    result->sz = gData->cursz;
    gData->cursz = sz;

    result->backtrack_op = op;
    result->backtrack_pc = target;
    result->cp = cp;
    result->parenCount = parenCount;
    result->parenIndex = parenIndex;

    result->saveStateStackTop = gData->stateStackTop;
    assert(gData->stateStackTop);
    memcpy(result + 1, gData->stateStack,
           sizeof(REProgState) * result->saveStateStackTop);

    if (parenCount != 0) {
        memcpy((char *)(result + 1) +
               sizeof(REProgState) * result->saveStateStackTop,
               &x->parens[parenIndex],
               sizeof(RECapture) * parenCount);
        for (i = 0; i != parenCount; i++)
            x->parens[parenIndex + i].index = -1;
    }

    return result;
}

Referenced by ExecuteREBytecode().

ReadCompactIndex()

static jsbytecode* ReadCompactIndex ( jsbytecode *  pc, size_t *  result  )

inlinestatic

Definition at line 385 of file regexp.c.

{
    size_t nextByte;

    nextByte = *pc++;
    if ((nextByte & 0x80) == 0) {
        /*
         * Short-circuit the most common case when compact index <= 127.
         */
        *result = nextByte;
    } else {
        size_t shift = 7;
        *result = 0x7F & nextByte;
        do {
            nextByte = *pc++;
            *result |= (nextByte & 0x7F) << shift;
            shift += 7;
        } while ((nextByte & 0x80) != 0);
    }
    return pc;
}

Referenced by ExecuteREBytecode(), and SimpleMatch().

ReallocStateStack()

static BOOL ReallocStateStack ( REGlobalData *  gData )

static

Definition at line 2297 of file regexp.c.

{
    size_t limit = gData->stateStackLimit;
    size_t sz = sizeof(REProgState) * limit;

    gData->stateStack = heap_pool_grow(gData->pool, gData->stateStack, sz, sz);
    if (!gData->stateStack) {
        js_ReportOutOfScriptQuota(gData->cx);
        gData->ok = FALSE;
        return FALSE;
    }
    gData->stateStackLimit = limit + limit;
    return TRUE;
}

regexp_destroy()

void regexp_destroy

(

regexp_t *

re

)

Definition at line 3181 of file regexp.c.

{
    if (re->classList) {
        UINT i;
        for (i = 0; i < re->classCount; i++) {
            if (re->classList[i].converted)
                heap_free(re->classList[i].u.bits);
            re->classList[i].u.bits = NULL;
        }
        heap_free(re->classList);
    }
    heap_free(re);
}

Referenced by RegExp2_put_Pattern(), RegExp2_Release(), RegExp_destructor(), regexp_new(), and regexp_set_flags().

regexp_execute()

HRESULT regexp_execute	(	regexp_t *	regexp,
		void *	cx,
		heap_pool_t *	pool,
		const WCHAR *	str,
		DWORD	str_len,
		match_state_t *	result
	)

Definition at line 3140 of file regexp.c.

{
    match_state_t *res;
    REGlobalData gData;
    heap_pool_t *mark = heap_pool_mark(pool);
    const WCHAR *str_beg = result->cp;
    HRESULT hres;

    assert(result->cp != NULL);

    gData.cpbegin = str;
    gData.cpend = str+str_len;
    gData.start = result->cp-str;
    gData.skipped = 0;
    gData.pool = pool;

    hres = InitMatch(regexp, cx, pool, &gData);
    if(FAILED(hres)) {
        WARN("InitMatch failed\n");
        heap_pool_clear(mark);
        return hres;
    }

    res = MatchRegExp(&gData, result);
    heap_pool_clear(mark);
    if(!gData.ok) {
        WARN("MatchRegExp failed\n");
        return E_FAIL;
    }

    if(!res) {
        result->match_len = 0;
        return S_FALSE;
    }

    result->match_len = (result->cp-str_beg) - gData.skipped;
    result->paren_count = regexp->parenCount;
    return S_OK;
}

Referenced by do_regexp_match_next(), RegExp2_Execute(), and RegExp2_Test().

regexp_new()

regexp_t* regexp_new	(	void *	cx,
		heap_pool_t *	pool,
		const WCHAR *	str,
		DWORD	str_len,
		WORD	flags,
		BOOL	flat
	)

Definition at line 3195 of file regexp.c.

{
    regexp_t *re;
    heap_pool_t *mark;
    CompilerState state;
    size_t resize;
    jsbytecode *endPC;
    UINT i;
    size_t len;

    re = NULL;
    mark = heap_pool_mark(pool);
    len = str_len;

    state.context = cx;
    state.pool = pool;
    state.cp = str;
    if (!state.cp)
        goto out;
    state.cpbegin = state.cp;
    state.cpend = state.cp + len;
    state.flags = flags;
    state.parenCount = 0;
    state.classCount = 0;
    state.progLength = 0;
    state.treeDepth = 0;
    state.classBitmapsMem = 0;
    for (i = 0; i < CLASS_CACHE_SIZE; i++)
        state.classCache[i].start = NULL;

    if (len != 0 && flat) {
        state.result = NewRENode(&state, REOP_FLAT);
        if (!state.result)
            goto out;
        state.result->u.flat.chr = *state.cpbegin;
        state.result->u.flat.length = len;
        state.result->kid = (void *) state.cpbegin;
        /* Flat bytecode: REOP_FLAT compact(string_offset) compact(len). */
        state.progLength += 1 + GetCompactIndexWidth(0)
                          + GetCompactIndexWidth(len);
    } else {
        if (!ParseRegExp(&state))
            goto out;
    }
    resize = offsetof(regexp_t, program) + state.progLength + 1;
    re = heap_alloc(resize);
    if (!re)
        goto out;

    assert(state.classBitmapsMem <= CLASS_BITMAPS_MEM_LIMIT);
    re->cl