1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
|
/* $Id: cccp.h,v 1.1.1.1 2001/04/26 20:01:49 waite Exp $ */
/* Structure allocated for every #define. For a simple replacement
such as
#define foo bar ,
nargs = -1, the `pattern' list is null, and the expansion is just
the replacement text. Nargs = 0 means a functionlike macro with no args,
e.g.,
#define getchar() getc (stdin) .
When there are args, the expansion is the replacement text with the
args squashed out, and the reflist is a list describing how to
build the output from the input: e.g., "3 chars, then the 1st arg,
then 9 chars, then the 3rd arg, then 0 chars, then the 2nd arg".
The chars here come from the expansion. Whatever is left of the
expansion after the last arg-occurrence is copied after that arg.
Note that the reflist can be arbitrarily long---
its length depends on the number of times the arguments appear in
the replacement text, not how many args there are. Example:
#define f(x) x+x+x+x+x+x+x would have replacement text "++++++" and
pattern list
{ (0, 1), (1, 1), (1, 1), ..., (1, 1), NULL }
where (x, y) means (nchars, argno). */
typedef char U_CHAR;
struct reflist {
struct reflist *next;
char stringify; /* nonzero if this arg was preceded by a
# operator. */
char raw_before; /* Nonzero if a ## operator before arg. */
char raw_after; /* Nonzero if a ## operator after arg. */
int nchars; /* Number of literal chars to copy before
this arg occurrence. */
int argno; /* Number of arg to substitute (origin-0) */
};
typedef struct definition {
int nargs;
int length; /* length of expansion string */
U_CHAR *expansion;
struct reflist *pattern;
/* Names of macro args, concatenated in reverse order
with comma-space between them.
The only use of this is that we warn on redefinition
if this differs between the old and new definitions. */
U_CHAR *argnames;
} DEFINITION;
/* different kinds of things that can appear in the value field
of a hash node. Actually, this may be useless now. */
union hashval {
int ival;
char *cpval;
DEFINITION *defn;
};
/* The structure of a node in the hash table. The hash table
has entries for all tokens defined by #define commands (type T_MACRO),
plus some special tokens like __LINE__ (these each have their own
type, and the appropriate code is run when that type of node is seen.
It does not contain control words like "#define", which are recognized
by a separate piece of code. */
/* different flavors of hash nodes --- also used in keyword table */
enum node_type {
T_DEFINE = 1, /* the `#define' keyword */
T_INCLUDE, /* the `#include' keyword */
T_IFDEF, /* the `#ifdef' keyword */
T_IFNDEF, /* the `#ifndef' keyword */
T_IF, /* the `#if' keyword */
T_ELSE, /* `#else' */
T_PRAGMA, /* `#pragma' */
T_ELIF, /* `#else' */
T_UNDEF, /* `#undef' */
T_LINE, /* `#line' */
T_ERROR, /* `#error' */
T_ENDIF, /* `#endif' */
T_SCCS, /* `#sccs', used on system V. */
T_IDENT, /* `#ident', used on system V. */
T_SPECLINE, /* special symbol `__LINE__' */
T_DATE, /* `__DATE__' */
T_FILE, /* `__FILE__' */
T_BASE_FILE, /* `__BASE_FILE__' */
T_INCLUDE_LEVEL, /* `__INCLUDE_LEVEL__' */
T_VERSION, /* `__VERSION__' */
T_TIME, /* `__TIME__' */
T_CONST, /* Constant value, used by `__STDC__' */
T_MACRO, /* macro defined by `#define' */
T_DISABLED, /* macro temporarily turned off for rescan */
T_SPEC_DEFINED, /* special `defined' macro for use in #if statements */
T_UNUSED /* Used for something not defined. */
};
typedef struct hashnode {
struct hashnode *next; /* double links for easy deletion */
struct hashnode *prev;
struct hashnode **bucket_hdr; /* also, a back pointer to this node's hash
chain is kept, in case the node is the head
of the chain and gets deleted. */
enum node_type type; /* type of special token */
int length; /* length of token, for quick comparison */
U_CHAR *name; /* the actual name */
union hashval value; /* pointer to expansion, or whatever */
} HASHNODE;
#if PROTO_OK
extern HASHNODE *lookup(U_CHAR *, int, int);
#else
extern HASHNODE *lookup();
#endif
|
