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pcre_jit_compile.c
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/*************************************************
* Perl-Compatible Regular Expressions *
*************************************************/
/* PCRE is a library of functions to support regular expressions whose syntax
and semantics are as close as possible to those of the Perl 5 language.
Written by Philip Hazel
Copyright (c) 1997-2012 University of Cambridge
The machine code generator part (this module) was written by Zoltan Herczeg
Copyright (c) 2010-2012
-----------------------------------------------------------------------------
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
* Neither the name of the University of Cambridge nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
-----------------------------------------------------------------------------
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "pcre_internal.h"
#ifdef SUPPORT_JIT
/* All-in-one: Since we use the JIT compiler only from here,
we just include it. This way we don't need to touch the build
system files. */
#define SLJIT_MALLOC(size) (PUBL(malloc))(size)
#define SLJIT_FREE(ptr) (PUBL(free))(ptr)
#define SLJIT_CONFIG_AUTO 1
#define SLJIT_CONFIG_STATIC 1
#define SLJIT_VERBOSE 0
#define SLJIT_DEBUG 0
#include "sljit/sljitLir.c"
#if defined SLJIT_CONFIG_UNSUPPORTED && SLJIT_CONFIG_UNSUPPORTED
#error Unsupported architecture
#endif
/* Allocate memory on the stack. Fast, but limited size. */
#define LOCAL_SPACE_SIZE 32768
#define STACK_GROWTH_RATE 8192
/* Enable to check that the allocation could destroy temporaries. */
#if defined SLJIT_DEBUG && SLJIT_DEBUG
#define DESTROY_REGISTERS 1
#endif
/*
Short summary about the backtracking mechanism empolyed by the jit code generator:
The code generator follows the recursive nature of the PERL compatible regular
expressions. The basic blocks of regular expressions are condition checkers
whose execute different commands depending on the result of the condition check.
The relationship between the operators can be horizontal (concatenation) and
vertical (sub-expression) (See struct fallback_common for more details).
'ab' - 'a' and 'b' regexps are concatenated
'a+' - 'a' is the sub-expression of the '+' operator
The condition checkers are boolean (true/false) checkers. Machine code is generated
for the checker itself and for the actions depending on the result of the checker.
The 'true' case is called as the hot path (expected path), and the other is called as
the 'fallback' path. Branch instructions are expesive for all CPUs, so we avoid taken
branches on the hot path.
Greedy star operator (*) :
Hot path: match happens.
Fallback path: match failed.
Non-greedy star operator (*?) :
Hot path: no need to perform a match.
Fallback path: match is required.
The following example shows how the code generated for a capturing bracket
with two alternatives. Let A, B, C, D are arbirary regular expressions, and
we have the following regular expression:
A(B|C)D
The generated code will be the following:
A hot path
'(' hot path (pushing arguments to the stack)
B hot path
')' hot path (pushing arguments to the stack)
D hot path
return with successful match
D fallback path
')' fallback path (If we arrived from "C" jump to the fallback of "C")
B fallback path
C expected path
jump to D hot path
C fallback path
A fallback path
Notice, that the order of fallback code paths are the opposite of the fast
code paths. In this way the topmost value on the stack is always belong
to the current fallback code path. The fallback code path must check
whether there is a next alternative. If so, it needs to jump back to
the hot path eventually. Otherwise it needs to clear out its own stack
frame and continue the execution on the fallback code paths.
*/
/*
Saved stack frames:
Atomic blocks and asserts require reloading the values of local variables
when the fallback mechanism performed. Because of OP_RECURSE, the locals
are not necessarly known in compile time, thus we need a dynamic restore
mechanism.
The stack frames are stored in a chain list, and have the following format:
([ capturing bracket offset ][ start value ][ end value ])+ ... [ 0 ] [ previous head ]
Thus we can restore the locals to a particular point in the stack.
*/
typedef struct jit_arguments {
/* Pointers first. */
struct sljit_stack *stack;
const pcre_uchar *str;
const pcre_uchar *begin;
const pcre_uchar *end;
int *offsets;
pcre_uchar *uchar_ptr;
pcre_uchar *mark_ptr;
/* Everything else after. */
int offsetcount;
int calllimit;
pcre_uint8 notbol;
pcre_uint8 noteol;
pcre_uint8 notempty;
pcre_uint8 notempty_atstart;
} jit_arguments;
typedef struct executable_functions {
void *executable_funcs[JIT_NUMBER_OF_COMPILE_MODES];
PUBL(jit_callback) callback;
void *userdata;
sljit_uw executable_sizes[JIT_NUMBER_OF_COMPILE_MODES];
} executable_functions;
typedef struct jump_list {
struct sljit_jump *jump;
struct jump_list *next;
} jump_list;
enum stub_types { stack_alloc };
typedef struct stub_list {
enum stub_types type;
int data;
struct sljit_jump *start;
struct sljit_label *leave;
struct stub_list *next;
} stub_list;
typedef int (SLJIT_CALL *jit_function)(jit_arguments *args);
/* The following structure is the key data type for the recursive
code generator. It is allocated by compile_hotpath, and contains
the aguments for compile_fallbackpath. Must be the first member
of its descendants. */
typedef struct fallback_common {
/* Concatenation stack. */
struct fallback_common *prev;
jump_list *nextfallbacks;
/* Internal stack (for component operators). */
struct fallback_common *top;
jump_list *topfallbacks;
/* Opcode pointer. */
pcre_uchar *cc;
} fallback_common;
typedef struct assert_fallback {
fallback_common common;
jump_list *condfailed;
/* Less than 0 (-1) if a frame is not needed. */
int framesize;
/* Points to our private memory word on the stack. */
int localptr;
/* For iterators. */
struct sljit_label *hotpath;
} assert_fallback;
typedef struct bracket_fallback {
fallback_common common;
/* Where to coninue if an alternative is successfully matched. */
struct sljit_label *althotpath;
/* For rmin and rmax iterators. */
struct sljit_label *recursivehotpath;
/* For greedy ? operator. */
struct sljit_label *zerohotpath;
/* Contains the branches of a failed condition. */
union {
/* Both for OP_COND, OP_SCOND. */
jump_list *condfailed;
assert_fallback *assert;
/* For OP_ONCE. -1 if not needed. */
int framesize;
} u;
/* Points to our private memory word on the stack. */
int localptr;
} bracket_fallback;
typedef struct bracketpos_fallback {
fallback_common common;
/* Points to our private memory word on the stack. */
int localptr;
/* Reverting stack is needed. */
int framesize;
/* Allocated stack size. */
int stacksize;
} bracketpos_fallback;
typedef struct braminzero_fallback {
fallback_common common;
struct sljit_label *hotpath;
} braminzero_fallback;
typedef struct iterator_fallback {
fallback_common common;
/* Next iteration. */
struct sljit_label *hotpath;
} iterator_fallback;
typedef struct recurse_entry {
struct recurse_entry *next;
/* Contains the function entry. */
struct sljit_label *entry;
/* Collects the calls until the function is not created. */
jump_list *calls;
/* Points to the starting opcode. */
int start;
} recurse_entry;
typedef struct recurse_fallback {
fallback_common common;
} recurse_fallback;
typedef struct compiler_common {
struct sljit_compiler *compiler;
pcre_uchar *start;
/* Local stack area size and variable pointers. */
int localsize;
int *localptrs;
int cbraptr;
/* OVector starting point. Must be divisible by 2. */
int ovector_start;
/* Last known position of the requested byte. */
int req_char_ptr;
/* Head of the last recursion. */
int recursive_head;
/* First inspected character for partial matching. */
int start_used_ptr;
/* Starting pointer for partial soft matches. */
int hit_start;
/* End pointer of the first line. */
int first_line_end;
/* Points to the marked string. */
int mark_ptr;
/* Other */
const pcre_uint8 *fcc;
sljit_w lcc;
int mode;
int nltype;
int newline;
int bsr_nltype;
int endonly;
BOOL has_set_som;
sljit_w ctypes;
sljit_uw name_table;
sljit_w name_count;
sljit_w name_entry_size;
/* Labels and jump lists. */
struct sljit_label *partialmatchlabel;
struct sljit_label *acceptlabel;
stub_list *stubs;
recurse_entry *entries;
recurse_entry *currententry;
jump_list *partialmatch;
jump_list *accept;
jump_list *calllimit;
jump_list *stackalloc;
jump_list *revertframes;
jump_list *wordboundary;
jump_list *anynewline;
jump_list *hspace;
jump_list *vspace;
jump_list *casefulcmp;
jump_list *caselesscmp;
BOOL jscript_compat;
#ifdef SUPPORT_UTF
BOOL utf;
#ifdef SUPPORT_UCP
BOOL use_ucp;
#endif
jump_list *utfreadchar;
#ifdef COMPILE_PCRE8
jump_list *utfreadtype8;
#endif
#endif /* SUPPORT_UTF */
#ifdef SUPPORT_UCP
jump_list *getucd;
#endif
} compiler_common;
/* For byte_sequence_compare. */
typedef struct compare_context {
int length;
int sourcereg;
#if defined SLJIT_UNALIGNED && SLJIT_UNALIGNED
int ucharptr;
union {
sljit_i asint;
sljit_uh asushort;
#ifdef COMPILE_PCRE8
sljit_ub asbyte;
sljit_ub asuchars[4];
#else
#ifdef COMPILE_PCRE16
sljit_uh asuchars[2];
#endif
#endif
} c;
union {
sljit_i asint;
sljit_uh asushort;
#ifdef COMPILE_PCRE8
sljit_ub asbyte;
sljit_ub asuchars[4];
#else
#ifdef COMPILE_PCRE16
sljit_uh asuchars[2];
#endif
#endif
} oc;
#endif
} compare_context;
enum {
frame_end = 0,
frame_setstrbegin = -1,
frame_setmark = -2
};
/* Undefine sljit macros. */
#undef CMP
/* Used for accessing the elements of the stack. */
#define STACK(i) ((-(i) - 1) * (int)sizeof(sljit_w))
#define TMP1 SLJIT_TEMPORARY_REG1
#define TMP2 SLJIT_TEMPORARY_REG3
#define TMP3 SLJIT_TEMPORARY_EREG2
#define STR_PTR SLJIT_SAVED_REG1
#define STR_END SLJIT_SAVED_REG2
#define STACK_TOP SLJIT_TEMPORARY_REG2
#define STACK_LIMIT SLJIT_SAVED_REG3
#define ARGUMENTS SLJIT_SAVED_EREG1
#define CALL_COUNT SLJIT_SAVED_EREG2
#define RETURN_ADDR SLJIT_TEMPORARY_EREG1
/* Locals layout. */
/* These two locals can be used by the current opcode. */
#define LOCALS0 (0 * sizeof(sljit_w))
#define LOCALS1 (1 * sizeof(sljit_w))
/* Two local variables for possessive quantifiers (char1 cannot use them). */
#define POSSESSIVE0 (2 * sizeof(sljit_w))
#define POSSESSIVE1 (3 * sizeof(sljit_w))
/* Max limit of recursions. */
#define CALL_LIMIT (4 * sizeof(sljit_w))
/* The output vector is stored on the stack, and contains pointers
to characters. The vector data is divided into two groups: the first
group contains the start / end character pointers, and the second is
the start pointers when the end of the capturing group has not yet reached. */
#define OVECTOR_START (common->ovector_start)
#define OVECTOR(i) (OVECTOR_START + (i) * sizeof(sljit_w))
#define OVECTOR_PRIV(i) (common->cbraptr + (i) * sizeof(sljit_w))
#define PRIV_DATA(cc) (common->localptrs[(cc) - common->start])
#ifdef COMPILE_PCRE8
#define MOV_UCHAR SLJIT_MOV_UB
#define MOVU_UCHAR SLJIT_MOVU_UB
#else
#ifdef COMPILE_PCRE16
#define MOV_UCHAR SLJIT_MOV_UH
#define MOVU_UCHAR SLJIT_MOVU_UH
#else
#error Unsupported compiling mode
#endif
#endif
/* Shortcuts. */
#define DEFINE_COMPILER \
struct sljit_compiler *compiler = common->compiler
#define OP1(op, dst, dstw, src, srcw) \
sljit_emit_op1(compiler, (op), (dst), (dstw), (src), (srcw))
#define OP2(op, dst, dstw, src1, src1w, src2, src2w) \
sljit_emit_op2(compiler, (op), (dst), (dstw), (src1), (src1w), (src2), (src2w))
#define LABEL() \
sljit_emit_label(compiler)
#define JUMP(type) \
sljit_emit_jump(compiler, (type))
#define JUMPTO(type, label) \
sljit_set_label(sljit_emit_jump(compiler, (type)), (label))
#define JUMPHERE(jump) \
sljit_set_label((jump), sljit_emit_label(compiler))
#define CMP(type, src1, src1w, src2, src2w) \
sljit_emit_cmp(compiler, (type), (src1), (src1w), (src2), (src2w))
#define CMPTO(type, src1, src1w, src2, src2w, label) \
sljit_set_label(sljit_emit_cmp(compiler, (type), (src1), (src1w), (src2), (src2w)), (label))
#define COND_VALUE(op, dst, dstw, type) \
sljit_emit_cond_value(compiler, (op), (dst), (dstw), (type))
static pcre_uchar* bracketend(pcre_uchar* cc)
{
SLJIT_ASSERT((*cc >= OP_ASSERT && *cc <= OP_ASSERTBACK_NOT) || (*cc >= OP_ONCE && *cc <= OP_SCOND));
do cc += GET(cc, 1); while (*cc == OP_ALT);
SLJIT_ASSERT(*cc >= OP_KET && *cc <= OP_KETRPOS);
cc += 1 + LINK_SIZE;
return cc;
}
/* Functions whose might need modification for all new supported opcodes:
next_opcode
get_localspace
set_localptrs
get_framesize
init_frame
get_localsize
copy_locals
compile_hotpath
compile_fallbackpath
*/
static pcre_uchar *next_opcode(compiler_common *common, pcre_uchar *cc)
{
SLJIT_UNUSED_ARG(common);
switch(*cc)
{
case OP_SOD:
case OP_SOM:
case OP_SET_SOM:
case OP_NOT_WORD_BOUNDARY:
case OP_WORD_BOUNDARY:
case OP_NOT_DIGIT:
case OP_DIGIT:
case OP_NOT_WHITESPACE:
case OP_WHITESPACE:
case OP_NOT_WORDCHAR:
case OP_WORDCHAR:
case OP_ANY:
case OP_ALLANY:
case OP_ANYNL:
case OP_NOT_HSPACE:
case OP_HSPACE:
case OP_NOT_VSPACE:
case OP_VSPACE:
case OP_EXTUNI:
case OP_EODN:
case OP_EOD:
case OP_CIRC:
case OP_CIRCM:
case OP_DOLL:
case OP_DOLLM:
case OP_TYPESTAR:
case OP_TYPEMINSTAR:
case OP_TYPEPLUS:
case OP_TYPEMINPLUS:
case OP_TYPEQUERY:
case OP_TYPEMINQUERY:
case OP_TYPEPOSSTAR:
case OP_TYPEPOSPLUS:
case OP_TYPEPOSQUERY:
case OP_CRSTAR:
case OP_CRMINSTAR:
case OP_CRPLUS:
case OP_CRMINPLUS:
case OP_CRQUERY:
case OP_CRMINQUERY:
case OP_DEF:
case OP_BRAZERO:
case OP_BRAMINZERO:
case OP_BRAPOSZERO:
case OP_FAIL:
case OP_ACCEPT:
case OP_ASSERT_ACCEPT:
case OP_SKIPZERO:
return cc + 1;
case OP_ANYBYTE:
#ifdef SUPPORT_UTF
if (common->utf) return NULL;
#endif
return cc + 1;
case OP_CHAR:
case OP_CHARI:
case OP_NOT:
case OP_NOTI:
case OP_STAR:
case OP_MINSTAR:
case OP_PLUS:
case OP_MINPLUS:
case OP_QUERY:
case OP_MINQUERY:
case OP_POSSTAR:
case OP_POSPLUS:
case OP_POSQUERY:
case OP_STARI:
case OP_MINSTARI:
case OP_PLUSI:
case OP_MINPLUSI:
case OP_QUERYI:
case OP_MINQUERYI:
case OP_POSSTARI:
case OP_POSPLUSI:
case OP_POSQUERYI:
case OP_NOTSTAR:
case OP_NOTMINSTAR:
case OP_NOTPLUS:
case OP_NOTMINPLUS:
case OP_NOTQUERY:
case OP_NOTMINQUERY:
case OP_NOTPOSSTAR:
case OP_NOTPOSPLUS:
case OP_NOTPOSQUERY:
case OP_NOTSTARI:
case OP_NOTMINSTARI:
case OP_NOTPLUSI:
case OP_NOTMINPLUSI:
case OP_NOTQUERYI:
case OP_NOTMINQUERYI:
case OP_NOTPOSSTARI:
case OP_NOTPOSPLUSI:
case OP_NOTPOSQUERYI:
cc += 2;
#ifdef SUPPORT_UTF
if (common->utf && HAS_EXTRALEN(cc[-1])) cc += GET_EXTRALEN(cc[-1]);
#endif
return cc;
case OP_UPTO:
case OP_MINUPTO:
case OP_EXACT:
case OP_POSUPTO:
case OP_UPTOI:
case OP_MINUPTOI:
case OP_EXACTI:
case OP_POSUPTOI:
case OP_NOTUPTO:
case OP_NOTMINUPTO:
case OP_NOTEXACT:
case OP_NOTPOSUPTO:
case OP_NOTUPTOI:
case OP_NOTMINUPTOI:
case OP_NOTEXACTI:
case OP_NOTPOSUPTOI:
cc += 2 + IMM2_SIZE;
#ifdef SUPPORT_UTF
if (common->utf && HAS_EXTRALEN(cc[-1])) cc += GET_EXTRALEN(cc[-1]);
#endif
return cc;
case OP_NOTPROP:
case OP_PROP:
return cc + 1 + 2;
case OP_TYPEUPTO:
case OP_TYPEMINUPTO:
case OP_TYPEEXACT:
case OP_TYPEPOSUPTO:
case OP_REF:
case OP_REFI:
case OP_CREF:
case OP_NCREF:
case OP_RREF:
case OP_NRREF:
case OP_CLOSE:
cc += 1 + IMM2_SIZE;
return cc;
case OP_CRRANGE:
case OP_CRMINRANGE:
return cc + 1 + 2 * IMM2_SIZE;
case OP_CLASS:
case OP_NCLASS:
return cc + 1 + 32 / sizeof(pcre_uchar);
#if defined SUPPORT_UTF || !defined COMPILE_PCRE8
case OP_XCLASS:
return cc + GET(cc, 1);
#endif
case OP_RECURSE:
case OP_ASSERT:
case OP_ASSERT_NOT:
case OP_ASSERTBACK:
case OP_ASSERTBACK_NOT:
case OP_REVERSE:
case OP_ONCE:
case OP_ONCE_NC:
case OP_BRA:
case OP_BRAPOS:
case OP_COND:
case OP_SBRA:
case OP_SBRAPOS:
case OP_SCOND:
case OP_ALT:
case OP_KET:
case OP_KETRMAX:
case OP_KETRMIN:
case OP_KETRPOS:
return cc + 1 + LINK_SIZE;
case OP_CBRA:
case OP_CBRAPOS:
case OP_SCBRA:
case OP_SCBRAPOS:
return cc + 1 + LINK_SIZE + IMM2_SIZE;
case OP_MARK:
return cc + 1 + 2 + cc[1];
default:
return NULL;
}
}
static int get_localspace(compiler_common *common, pcre_uchar *cc, pcre_uchar *ccend)
{
int localspace = 0;
pcre_uchar *alternative;
/* Calculate important variables (like stack size) and checks whether all opcodes are supported. */
while (cc < ccend)
{
switch(*cc)
{
case OP_SET_SOM:
common->has_set_som = TRUE;
cc += 1;
break;
case OP_ASSERT:
case OP_ASSERT_NOT:
case OP_ASSERTBACK:
case OP_ASSERTBACK_NOT:
case OP_ONCE:
case OP_ONCE_NC:
case OP_BRAPOS:
case OP_SBRA:
case OP_SBRAPOS:
case OP_SCOND:
localspace += sizeof(sljit_w);
cc += 1 + LINK_SIZE;
break;
case OP_CBRAPOS:
case OP_SCBRAPOS:
localspace += sizeof(sljit_w);
cc += 1 + LINK_SIZE + IMM2_SIZE;
break;
case OP_COND:
/* Might be a hidden SCOND. */
alternative = cc + GET(cc, 1);
if (*alternative == OP_KETRMAX || *alternative == OP_KETRMIN)
localspace += sizeof(sljit_w);
cc += 1 + LINK_SIZE;
break;
case OP_RECURSE:
/* Set its value only once. */
if (common->recursive_head == 0)
{
common->recursive_head = common->ovector_start;
common->ovector_start += sizeof(sljit_w);
}
cc += 1 + LINK_SIZE;
break;
case OP_MARK:
if (common->mark_ptr == 0)
{
common->mark_ptr = common->ovector_start;
common->ovector_start += sizeof(sljit_w);
}
cc += 1 + 2 + cc[1];
break;
default:
cc = next_opcode(common, cc);
if (cc == NULL)
return -1;
break;
}
}
return localspace;
}
static void set_localptrs(compiler_common *common, int localptr, pcre_uchar *ccend)
{
pcre_uchar *cc = common->start;
pcre_uchar *alternative;
while (cc < ccend)
{
switch(*cc)
{
case OP_ASSERT:
case OP_ASSERT_NOT:
case OP_ASSERTBACK:
case OP_ASSERTBACK_NOT:
case OP_ONCE:
case OP_ONCE_NC:
case OP_BRAPOS:
case OP_SBRA:
case OP_SBRAPOS:
case OP_SCOND:
common->localptrs[cc - common->start] = localptr;
localptr += sizeof(sljit_w);
cc += 1 + LINK_SIZE;
break;
case OP_CBRAPOS:
case OP_SCBRAPOS:
common->localptrs[cc - common->start] = localptr;
localptr += sizeof(sljit_w);
cc += 1 + LINK_SIZE + IMM2_SIZE;
break;
case OP_COND:
/* Might be a hidden SCOND. */
alternative = cc + GET(cc, 1);
if (*alternative == OP_KETRMAX || *alternative == OP_KETRMIN)
{
common->localptrs[cc - common->start] = localptr;
localptr += sizeof(sljit_w);
}
cc += 1 + LINK_SIZE;
break;
default:
cc = next_opcode(common, cc);
SLJIT_ASSERT(cc != NULL);
break;
}
}
}
/* Returns with -1 if no need for frame. */
static int get_framesize(compiler_common *common, pcre_uchar *cc, BOOL recursive)
{
pcre_uchar *ccend = bracketend(cc);
int length = 0;
BOOL possessive = FALSE;
BOOL setsom_found = recursive;
BOOL setmark_found = recursive;
if (!recursive && (*cc == OP_CBRAPOS || *cc == OP_SCBRAPOS))
{
length = 3;
possessive = TRUE;
}
cc = next_opcode(common, cc);
SLJIT_ASSERT(cc != NULL);
while (cc < ccend)
switch(*cc)
{
case OP_SET_SOM:
SLJIT_ASSERT(common->has_set_som);
if (!setsom_found)
{
length += 2;
setsom_found = TRUE;
}
cc += 1;
break;
case OP_MARK:
SLJIT_ASSERT(common->mark_ptr != 0);
if (!setmark_found)
{
length += 2;
setmark_found = TRUE;
}
cc += 1 + 2 + cc[1];
break;
case OP_RECURSE:
if (common->has_set_som && !setsom_found)
{
length += 2;
setsom_found = TRUE;
}
if (common->mark_ptr != 0 && !setmark_found)
{
length += 2;
setmark_found = TRUE;
}
cc += 1 + LINK_SIZE;
break;
case OP_CBRA:
case OP_CBRAPOS:
case OP_SCBRA:
case OP_SCBRAPOS:
length += 3;
cc += 1 + LINK_SIZE + IMM2_SIZE;
break;
default:
cc = next_opcode(common, cc);
SLJIT_ASSERT(cc != NULL);
break;
}
/* Possessive quantifiers can use a special case. */
if (SLJIT_UNLIKELY(possessive) && length == 3)
return -1;
if (length > 0)
return length + 1;
return -1;
}
static void init_frame(compiler_common *common, pcre_uchar *cc, int stackpos, int stacktop, BOOL recursive)
{
DEFINE_COMPILER;
pcre_uchar *ccend = bracketend(cc);
BOOL setsom_found = recursive;
BOOL setmark_found = recursive;
int offset;
/* >= 1 + shortest item size (2) */
SLJIT_UNUSED_ARG(stacktop);
SLJIT_ASSERT(stackpos >= stacktop + 2);
stackpos = STACK(stackpos);
if (recursive || (*cc != OP_CBRAPOS && *cc != OP_SCBRAPOS))
cc = next_opcode(common, cc);
SLJIT_ASSERT(cc != NULL);
while (cc < ccend)
switch(*cc)
{
case OP_SET_SOM:
SLJIT_ASSERT(common->has_set_som);
if (!setsom_found)
{
OP1(SLJIT_MOV, TMP1, 0, SLJIT_MEM1(SLJIT_LOCALS_REG), OVECTOR(0));
OP1(SLJIT_MOV, SLJIT_MEM1(STACK_TOP), stackpos, SLJIT_IMM, frame_setstrbegin);
stackpos += (int)sizeof(sljit_w);
OP1(SLJIT_MOV, SLJIT_MEM1(STACK_TOP), stackpos, TMP1, 0);
stackpos += (int)sizeof(sljit_w);
setsom_found = TRUE;
}
cc += 1;
break;
case OP_MARK:
SLJIT_ASSERT(common->mark_ptr != 0);
if (!setmark_found)
{
OP1(SLJIT_MOV, TMP1, 0, SLJIT_MEM1(SLJIT_LOCALS_REG), common->mark_ptr);
OP1(SLJIT_MOV, SLJIT_MEM1(STACK_TOP), stackpos, SLJIT_IMM, frame_setmark);
stackpos += (int)sizeof(sljit_w);
OP1(SLJIT_MOV, SLJIT_MEM1(STACK_TOP), stackpos, TMP1, 0);
stackpos += (int)sizeof(sljit_w);
setmark_found = TRUE;
}
cc += 1 + 2 + cc[1];
break;
case OP_RECURSE:
if (common->has_set_som && !setsom_found)
{
OP1(SLJIT_MOV, TMP1, 0, SLJIT_MEM1(SLJIT_LOCALS_REG), OVECTOR(0));
OP1(SLJIT_MOV, SLJIT_MEM1(STACK_TOP), stackpos, SLJIT_IMM, frame_setstrbegin);
stackpos += (int)sizeof(sljit_w);
OP1(SLJIT_MOV, SLJIT_MEM1(STACK_TOP), stackpos, TMP1, 0);
stackpos += (int)sizeof(sljit_w);
setsom_found = TRUE;
}
if (common->mark_ptr != 0 && !setmark_found)
{
OP1(SLJIT_MOV, TMP1, 0, SLJIT_MEM1(SLJIT_LOCALS_REG), common->mark_ptr);
OP1(SLJIT_MOV, SLJIT_MEM1(STACK_TOP), stackpos, SLJIT_IMM, frame_setmark);
stackpos += (int)sizeof(sljit_w);
OP1(SLJIT_MOV, SLJIT_MEM1(STACK_TOP), stackpos, TMP1, 0);
stackpos += (int)sizeof(sljit_w);
setmark_found = TRUE;
}
cc += 1 + LINK_SIZE;
break;
case OP_CBRA:
case OP_CBRAPOS:
case OP_SCBRA:
case OP_SCBRAPOS:
offset = (GET2(cc, 1 + LINK_SIZE)) << 1;
OP1(SLJIT_MOV, SLJIT_MEM1(STACK_TOP), stackpos, SLJIT_IMM, OVECTOR(offset));
stackpos += (int)sizeof(sljit_w);
OP1(SLJIT_MOV, TMP1, 0, SLJIT_MEM1(SLJIT_LOCALS_REG), OVECTOR(offset));
OP1(SLJIT_MOV, TMP2, 0, SLJIT_MEM1(SLJIT_LOCALS_REG), OVECTOR(offset + 1));
OP1(SLJIT_MOV, SLJIT_MEM1(STACK_TOP), stackpos, TMP1, 0);
stackpos += (int)sizeof(sljit_w);
OP1(SLJIT_MOV, SLJIT_MEM1(STACK_TOP), stackpos, TMP2, 0);
stackpos += (int)sizeof(sljit_w);
cc += 1 + LINK_SIZE + IMM2_SIZE;
break;
default:
cc = next_opcode(common, cc);
SLJIT_ASSERT(cc != NULL);
break;
}
OP1(SLJIT_MOV, SLJIT_MEM1(STACK_TOP), stackpos, SLJIT_IMM, frame_end);
SLJIT_ASSERT(stackpos == STACK(stacktop));
}
static SLJIT_INLINE int get_localsize(compiler_common *common, pcre_uchar *cc, pcre_uchar *ccend)
{
int localsize = 2;
pcre_uchar *alternative;
/* Calculate the sum of the local variables. */
while (cc < ccend)
{
switch(*cc)
{
case OP_ASSERT:
case OP_ASSERT_NOT:
case OP_ASSERTBACK:
case OP_ASSERTBACK_NOT:
case OP_ONCE:
case OP_ONCE_NC:
case OP_BRAPOS:
case OP_SBRA:
case OP_SBRAPOS:
case OP_SCOND:
localsize++;
cc += 1 + LINK_SIZE;
break;
case OP_CBRA:
case OP_SCBRA:
localsize++;
cc += 1 + LINK_SIZE + IMM2_SIZE;
break;
case OP_CBRAPOS:
case OP_SCBRAPOS:
localsize += 2;
cc += 1 + LINK_SIZE + IMM2_SIZE;
break;
case OP_COND:
/* Might be a hidden SCOND. */
alternative = cc + GET(cc, 1);
if (*alternative == OP_KETRMAX || *alternative == OP_KETRMIN)
localsize++;
cc += 1 + LINK_SIZE;
break;