* Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
* 2000, 2001, 2002, 2003, 2005 by Larry Wall and others
* You may distribute under the terms of either the GNU General Public
* License or the Artistic License, as specified in the README file.
typedef OP OP_4tree
; /* Will be redefined later. */
* The "internal use only" fields in regexp.h are present to pass info from
* compile to execute that permits the execute phase to run lots faster on
* simple cases. They are:
* regstart sv that must begin a match; Nullch if none obvious
* reganch is the match anchored (at beginning-of-line only)?
* regmust string (pointer into program) that match must include, or NULL
* [regmust changed to SV* for bminstr()--law]
* regmlen length of regmust string
* [regmlen not used currently]
* Regstart and reganch permit very fast decisions on suitable starting points
* for a match, cutting down the work a lot. Regmust permits fast rejection
* of lines that cannot possibly match. The regmust tests are costly enough
* that pregcomp() supplies a regmust only if the r.e. contains something
* potentially expensive (at present, the only such thing detected is * or +
* at the start of the r.e., which can involve a lot of backup). Regmlen is
* supplied because the test in pregexec() needs it and pregcomp() is computing
* [regmust is now supplied always. The tests that use regmust have a
* heuristic that disables the test if it usually matches.]
* [In fact, we now use regmust in many cases to locate where the search
* starts in the string, so if regback is >= 0, the regmust search is never
* wasted effort. The regback variable says how many characters back from
* where regmust matched is the earliest possible start of the match.
* For instance, /[a-z].foo/ has a regmust of 'foo' and a regback of 2.]
* Structure for regexp "program". This is essentially a linear encoding
* of a nondeterministic finite-state machine (aka syntax charts or
* "railroad normal form" in parsing technology). Each node is an opcode
* plus a "next" pointer, possibly plus an operand. "Next" pointers of
* all nodes except BRANCH implement concatenation; a "next" pointer with
* a BRANCH on both ends of it is connecting two alternatives. (Here we
* have one of the subtle syntax dependencies: an individual BRANCH (as
* opposed to a collection of them) is never concatenated with anything
* because of operator precedence.) The operand of some types of node is
* a literal string; for others, it is a node leading into a sub-FSM. In
* particular, the operand of a BRANCH node is the first node of the branch.
* (NB this is *not* a tree structure: the tail of the branch connects
* to the thing following the set of BRANCHes.) The opcodes are:
* A node is one char of opcode followed by two chars of "next" pointer.
* "Next" pointers are stored as two 8-bit pieces, high order first. The
* value is a positive offset from the opcode of the node containing it.
* An operand, if any, simply follows the node. (Note that much of the
* code generation knows about this implicit relationship.)
* Using two bytes for the "next" pointer is vast overkill for most things,
* but allows patterns to get big without disasters.
* [The "next" pointer is always aligned on an even
* boundary, and reads the offset directly as a short. Also, there is no
* special test to reverse the sign of BACK pointers since the offset is
#define ANYOF_BITMAP_SIZE 32 /* 256 b/(8 b/B) */
#define ANYOF_CLASSBITMAP_SIZE 4 /* up to 32 (8*4) named classes */
struct regnode_charclass
{
char bitmap
[ANYOF_BITMAP_SIZE
]; /* only compile-time */
struct regnode_charclass_class
{ /* has [[:blah:]] classes */
U8 flags
; /* should have ANYOF_CLASS here */
char bitmap
[ANYOF_BITMAP_SIZE
]; /* both compile-time */
char classflags
[ANYOF_CLASSBITMAP_SIZE
]; /* and run-time */
/* XXX fix this description.
Impose a limit of REG_INFTY on various pattern matching operations
to limit stack growth and to avoid "infinite" recursions.
/* The default size for REG_INFTY is I16_MAX, which is the same as
SHORT_MAX (see perl.h). Unfortunately I16 isn't necessarily 16 bits
(see handy.h). On the Cray C90, sizeof(short)==4 and hence I16_MAX is
((1<<31)-1), while on the Cray T90, sizeof(short)==8 and I16_MAX is
((1<<63)-1). To limit stack growth to reasonable sizes, supply a
--Andy Dougherty 11 June 1998
# define REG_INFTY ((1<<15)-1)
# define REG_INFTY I16_MAX
#define ARG_VALUE(arg) (arg)
#define ARG__SET(arg,val) ((arg) = (val))
#define ARG(p) ARG_VALUE(ARG_LOC(p))
#define ARG1(p) ARG_VALUE(ARG1_LOC(p))
#define ARG2(p) ARG_VALUE(ARG2_LOC(p))
#define ARG_SET(p, val) ARG__SET(ARG_LOC(p), (val))
#define ARG1_SET(p, val) ARG__SET(ARG1_LOC(p), (val))
#define ARG2_SET(p, val) ARG__SET(ARG2_LOC(p), (val))
#define NEXT_OFF(p) ((p)->next_off)
#define NODE_ALIGN_FILL(node) ((node)->flags = 0xde) /* deadbeef */
#define SIZE_ALIGN NODE_ALIGN
#define OP(p) ((p)->type)
#define OPERAND(p) (((struct regnode_string *)p)->string)
#define MASK(p) ((char*)OPERAND(p))
#define STR_LEN(p) (((struct regnode_string *)p)->str_len)
#define STRING(p) (((struct regnode_string *)p)->string)
#define STR_SZ(l) ((l + sizeof(regnode) - 1) / sizeof(regnode))
#define NODE_SZ_STR(p) (STR_SZ(STR_LEN(p))+1)
#define ARG_LOC(p) (((struct regnode_1 *)p)->arg1)
#define ARG1_LOC(p) (((struct regnode_2 *)p)->arg1)
#define ARG2_LOC(p) (((struct regnode_2 *)p)->arg2)
#define NODE_STEP_REGNODE 1 /* sizeof(regnode)/sizeof(regnode) */
#define EXTRA_STEP_2ARGS EXTRA_SIZE(struct regnode_2)
#define NEXTOPER(p) ((p) + NODE_STEP_REGNODE)
#define PREVOPER(p) ((p) - NODE_STEP_REGNODE)
#define FILL_ADVANCE_NODE(ptr, op) STMT_START { \
(ptr)->type = op; (ptr)->next_off = 0; (ptr)++; } STMT_END
#define FILL_ADVANCE_NODE_ARG(ptr, op, arg) STMT_START { \
ARG_SET(ptr, arg); FILL_ADVANCE_NODE(ptr, op); (ptr) += 1; } STMT_END
#define SIZE_ONLY (RExC_emit == &PL_regdummy)
/* Flags for node->flags of ANYOF */
#define ANYOF_CLASS 0x08 /* has [[:blah:]] classes */
#define ANYOF_INVERT 0x04
#define ANYOF_LOCALE 0x01
/* Used for regstclass only */
#define ANYOF_EOS 0x10 /* Can match an empty string too */
/* There is a character or a range past 0xff */
#define ANYOF_UNICODE 0x20
#define ANYOF_UNICODE_ALL 0x40 /* Can match any char past 0xff */
/* size of node is large (includes class pointer) */
/* Are there any runtime flags on in this node? */
#define ANYOF_RUNTIME(s) (ANYOF_FLAGS(s) & 0x0f)
#define ANYOF_FLAGS_ALL 0xff
/* Character classes for node->classflags of ANYOF */
/* Should be synchronized with a table in regprop() */
/* 2n should pair with 2n+1 */
#define ANYOF_ALNUM 0 /* \w, PL_utf8_alnum, utf8::IsWord, ALNUM */
#define ANYOF_SPACE 2 /* \s */
#define ANYOF_ALNUMC 6 /* isalnum(3), utf8::IsAlnum, ALNUMC */
#define ANYOF_PSXSPC 26 /* POSIX space: \s plus the vertical tab */
#define ANYOF_BLANK 28 /* GNU extension: space and tab: non-vertical space */
/* Backward source code compatibility. */
#define ANYOF_ALNUML ANYOF_ALNUM
#define ANYOF_NALNUML ANYOF_NALNUM
#define ANYOF_SPACEL ANYOF_SPACE
#define ANYOF_NSPACEL ANYOF_NSPACE
/* Utility macros for the bitmap and classes of ANYOF */
#define ANYOF_SIZE (sizeof(struct regnode_charclass))
#define ANYOF_CLASS_SIZE (sizeof(struct regnode_charclass_class))
#define ANYOF_FLAGS(p) ((p)->flags)
#define ANYOF_BIT(c) (1 << ((c) & 7))
#define ANYOF_CLASS_BYTE(p, c) (((struct regnode_charclass_class*)(p))->classflags[((c) >> 3) & 3])
#define ANYOF_CLASS_SET(p, c) (ANYOF_CLASS_BYTE(p, c) |= ANYOF_BIT(c))
#define ANYOF_CLASS_CLEAR(p, c) (ANYOF_CLASS_BYTE(p, c) &= ~ANYOF_BIT(c))
#define ANYOF_CLASS_TEST(p, c) (ANYOF_CLASS_BYTE(p, c) & ANYOF_BIT(c))
#define ANYOF_CLASS_ZERO(ret) Zero(((struct regnode_charclass_class*)(ret))->classflags, ANYOF_CLASSBITMAP_SIZE, char)
#define ANYOF_BITMAP_ZERO(ret) Zero(((struct regnode_charclass*)(ret))->bitmap, ANYOF_BITMAP_SIZE, char)
#define ANYOF_BITMAP(p) (((struct regnode_charclass*)(p))->bitmap)
#define ANYOF_BITMAP_BYTE(p, c) (ANYOF_BITMAP(p)[((c) >> 3) & 31])
#define ANYOF_BITMAP_SET(p, c) (ANYOF_BITMAP_BYTE(p, c) |= ANYOF_BIT(c))
#define ANYOF_BITMAP_CLEAR(p,c) (ANYOF_BITMAP_BYTE(p, c) &= ~ANYOF_BIT(c))
#define ANYOF_BITMAP_TEST(p, c) (ANYOF_BITMAP_BYTE(p, c) & ANYOF_BIT(c))
#define ANYOF_BITMAP_SETALL(p) \
memset (ANYOF_BITMAP(p), 255, ANYOF_BITMAP_SIZE)
#define ANYOF_BITMAP_CLEARALL(p) \
Zero (ANYOF_BITMAP(p), ANYOF_BITMAP_SIZE)
/* Check that all 256 bits are all set. Used in S_cl_is_anything() */
#define ANYOF_BITMAP_TESTALLSET(p) \
memEQ (ANYOF_BITMAP(p), "\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377\377", ANYOF_BITMAP_SIZE)
#define ANYOF_SKIP ((ANYOF_SIZE - 1)/sizeof(regnode))
#define ANYOF_CLASS_SKIP ((ANYOF_CLASS_SIZE - 1)/sizeof(regnode))
#define ANYOF_CLASS_ADD_SKIP (ANYOF_CLASS_SKIP - ANYOF_SKIP)
# define UCHARAT(p) ((int)*(const U8*)(p))
# define UCHARAT(p) ((int)*(p)&CHARMASK)
#define EXTRA_SIZE(guy) ((sizeof(guy)-1)/sizeof(struct regnode))
#define REG_SEEN_ZERO_LEN 1
#define REG_SEEN_LOOKBEHIND 2
#define REG_SEEN_SANY REG_SEEN_CANY /* src bckwrd cmpt */
/* The following have no fixed length. U8 so we can do strchr() on it. */
EXTCONST U8 PL_varies
[] = {
BRANCH
, BACK
, STAR
, PLUS
, CURLY
, CURLYX
, REF
, REFF
, REFFL
,
WHILEM
, CURLYM
, CURLYN
, BRANCHJ
, IFTHEN
, SUSPEND
, CLUMP
, 0
/* The following always have a length of 1. U8 we can do strchr() on it. */
/* (Note that length 1 means "one character" under UTF8, not "one octet".) */
EXTCONST U8 PL_simple
[] = {
typedef struct re_scream_pos_data_s
char **scream_olds
; /* match pos */
I32
*scream_pos
; /* Internal iterator of scream. */
/* .what is a character array with one character for each member of .data
* The character describes the function of the corresponding .data item:
* f - start-class data for regstclass optimization
* n - Root of op tree for (?{EVAL}) item
* o - Start op for (?{EVAL}) item
* p - Pad for (?{EVAL} item
* s - swash for unicode-style character class, and the multicharacter
* strings resulting from casefolding the single-character entries
* 20010712 mjd@plover.com
* (Remember to update re_dup() and pregfree() if you add any items.)
struct reg_substr_datum
{
SV
*substr
; /* non-utf8 variant */
SV
*utf8_substr
; /* utf8 variant */
struct reg_substr_datum data
[3]; /* Actual array */
#define anchored_substr substrs->data[0].substr
#define anchored_utf8 substrs->data[0].utf8_substr
#define anchored_offset substrs->data[0].min_offset
#define float_substr substrs->data[1].substr
#define float_utf8 substrs->data[1].utf8_substr
#define float_min_offset substrs->data[1].min_offset
#define float_max_offset substrs->data[1].max_offset
#define check_substr substrs->data[2].substr
#define check_utf8 substrs->data[2].utf8_substr
#define check_offset_min substrs->data[2].min_offset
#define check_offset_max substrs->data[2].max_offset