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nasm/asm/preproc.c
H. Peter Anvin a6e26d9cca Add a generic pragma-handling infrastructure 
Add infrastructure for handling %pragmas with a variety of namespaces,
etc., etc...

Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
2017-03-07 21:32:37 -08:00

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/* ----------------------------------------------------------------------- *
*
* Copyright 1996-2017 The NASM Authors - All Rights Reserved
* See the file AUTHORS included with the NASM distribution for
* the specific copyright holders.
*
* 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.
*
* 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.
*
* ----------------------------------------------------------------------- */
/*
* preproc.c macro preprocessor for the Netwide Assembler
*/
/* Typical flow of text through preproc
*
* pp_getline gets tokenized lines, either
*
* from a macro expansion
*
* or
* {
* read_line gets raw text from stdmacpos, or predef, or current input file
* tokenize converts to tokens
* }
*
* expand_mmac_params is used to expand %1 etc., unless a macro is being
* defined or a false conditional is being processed
* (%0, %1, %+1, %-1, %%foo
*
* do_directive checks for directives
*
* expand_smacro is used to expand single line macros
*
* expand_mmacro is used to expand multi-line macros
*
* detoken is used to convert the line back to text
*/
#include "compiler.h"
#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
#include <stddef.h>
#include <string.h>
#include <ctype.h>
#include <limits.h>
#include "nasm.h"
#include "nasmlib.h"
#include "error.h"
#include "preproc.h"
#include "hashtbl.h"
#include "quote.h"
#include "stdscan.h"
#include "eval.h"
#include "tokens.h"
#include "tables.h"
#include "listing.h"
typedef struct SMacro SMacro;
typedef struct MMacro MMacro;
typedef struct MMacroInvocation MMacroInvocation;
typedef struct Context Context;
typedef struct Token Token;
typedef struct Blocks Blocks;
typedef struct Line Line;
typedef struct Include Include;
typedef struct Cond Cond;
typedef struct IncPath IncPath;
/*
* Note on the storage of both SMacro and MMacros: the hash table
* indexes them case-insensitively, and we then have to go through a
* linked list of potential case aliases (and, for MMacros, parameter
* ranges); this is to preserve the matching semantics of the earlier
* code. If the number of case aliases for a specific macro is a
* performance issue, you may want to reconsider your coding style.
*/
/*
* Store the definition of a single-line macro.
*/
struct SMacro {
SMacro *next;
char *name;
bool casesense;
bool in_progress;
unsigned int nparam;
Token *expansion;
};
/*
* Store the definition of a multi-line macro. This is also used to
* store the interiors of `%rep...%endrep' blocks, which are
* effectively self-re-invoking multi-line macros which simply
* don't have a name or bother to appear in the hash tables. %rep
* blocks are signified by having a NULL `name' field.
*
* In a MMacro describing a `%rep' block, the `in_progress' field
* isn't merely boolean, but gives the number of repeats left to
* run.
*
* The `next' field is used for storing MMacros in hash tables; the
* `next_active' field is for stacking them on istk entries.
*
* When a MMacro is being expanded, `params', `iline', `nparam',
* `paramlen', `rotate' and `unique' are local to the invocation.
*/
struct MMacro {
MMacro *next;
MMacroInvocation *prev; /* previous invocation */
char *name;
int nparam_min, nparam_max;
bool casesense;
bool plus; /* is the last parameter greedy? */
bool nolist; /* is this macro listing-inhibited? */
int64_t in_progress; /* is this macro currently being expanded? */
int32_t max_depth; /* maximum number of recursive expansions allowed */
Token *dlist; /* All defaults as one list */
Token **defaults; /* Parameter default pointers */
int ndefs; /* number of default parameters */
Line *expansion;
MMacro *next_active;
MMacro *rep_nest; /* used for nesting %rep */
Token **params; /* actual parameters */
Token *iline; /* invocation line */
unsigned int nparam, rotate;
int *paramlen;
uint64_t unique;
int lineno; /* Current line number on expansion */
uint64_t condcnt; /* number of if blocks... */
const char *fname; /* File where defined */
int32_t xline; /* First line in macro */
};
/* Store the definition of a multi-line macro, as defined in a
* previous recursive macro expansion.
*/
struct MMacroInvocation {
MMacroInvocation *prev; /* previous invocation */
Token **params; /* actual parameters */
Token *iline; /* invocation line */
unsigned int nparam, rotate;
int *paramlen;
uint64_t unique;
uint64_t condcnt;
};
/*
* The context stack is composed of a linked list of these.
*/
struct Context {
Context *next;
char *name;
struct hash_table localmac;
uint32_t number;
};
/*
* This is the internal form which we break input lines up into.
* Typically stored in linked lists.
*
* Note that `type' serves a double meaning: TOK_SMAC_PARAM is not
* necessarily used as-is, but is intended to denote the number of
* the substituted parameter. So in the definition
*
* %define a(x,y) ( (x) & ~(y) )
*
* the token representing `x' will have its type changed to
* TOK_SMAC_PARAM, but the one representing `y' will be
* TOK_SMAC_PARAM+1.
*
* TOK_INTERNAL_STRING is a dirty hack: it's a single string token
* which doesn't need quotes around it. Used in the pre-include
* mechanism as an alternative to trying to find a sensible type of
* quote to use on the filename we were passed.
*/
enum pp_token_type {
TOK_NONE = 0, TOK_WHITESPACE, TOK_COMMENT, TOK_ID,
TOK_PREPROC_ID, TOK_STRING,
TOK_NUMBER, TOK_FLOAT, TOK_SMAC_END, TOK_OTHER,
TOK_INTERNAL_STRING,
TOK_PREPROC_Q, TOK_PREPROC_QQ,
TOK_PASTE, /* %+ */
TOK_INDIRECT, /* %[...] */
TOK_SMAC_PARAM, /* MUST BE LAST IN THE LIST!!! */
TOK_MAX = INT_MAX /* Keep compiler from reducing the range */
};
#define PP_CONCAT_MASK(x) (1 << (x))
#define PP_CONCAT_MATCH(t, mask) (PP_CONCAT_MASK((t)->type) & mask)
struct tokseq_match {
int mask_head;
int mask_tail;
};
struct Token {
Token *next;
char *text;
union {
SMacro *mac; /* associated macro for TOK_SMAC_END */
size_t len; /* scratch length field */
} a; /* Auxiliary data */
enum pp_token_type type;
};
/*
* Multi-line macro definitions are stored as a linked list of
* these, which is essentially a container to allow several linked
* lists of Tokens.
*
* Note that in this module, linked lists are treated as stacks
* wherever possible. For this reason, Lines are _pushed_ on to the
* `expansion' field in MMacro structures, so that the linked list,
* if walked, would give the macro lines in reverse order; this
* means that we can walk the list when expanding a macro, and thus
* push the lines on to the `expansion' field in _istk_ in reverse
* order (so that when popped back off they are in the right
* order). It may seem cockeyed, and it relies on my design having
* an even number of steps in, but it works...
*
* Some of these structures, rather than being actual lines, are
* markers delimiting the end of the expansion of a given macro.
* This is for use in the cycle-tracking and %rep-handling code.
* Such structures have `finishes' non-NULL, and `first' NULL. All
* others have `finishes' NULL, but `first' may still be NULL if
* the line is blank.
*/
struct Line {
Line *next;
MMacro *finishes;
Token *first;
};
/*
* To handle an arbitrary level of file inclusion, we maintain a
* stack (ie linked list) of these things.
*/
struct Include {
Include *next;
FILE *fp;
Cond *conds;
Line *expansion;
const char *fname;
int lineno, lineinc;
MMacro *mstk; /* stack of active macros/reps */
};
/*
* Include search path. This is simply a list of strings which get
* prepended, in turn, to the name of an include file, in an
* attempt to find the file if it's not in the current directory.
*/
struct IncPath {
IncPath *next;
char *path;
};
/*
* File real name hash, so we don't have to re-search the include
* path for every pass (and potentially more than that if a file
* is used more than once.)
*/
struct hash_table FileHash;
/*
* Conditional assembly: we maintain a separate stack of these for
* each level of file inclusion. (The only reason we keep the
* stacks separate is to ensure that a stray `%endif' in a file
* included from within the true branch of a `%if' won't terminate
* it and cause confusion: instead, rightly, it'll cause an error.)
*/
struct Cond {
Cond *next;
int state;
};
enum {
/*
* These states are for use just after %if or %elif: IF_TRUE
* means the condition has evaluated to truth so we are
* currently emitting, whereas IF_FALSE means we are not
* currently emitting but will start doing so if a %else comes
* up. In these states, all directives are admissible: %elif,
* %else and %endif. (And of course %if.)
*/
COND_IF_TRUE, COND_IF_FALSE,
/*
* These states come up after a %else: ELSE_TRUE means we're
* emitting, and ELSE_FALSE means we're not. In ELSE_* states,
* any %elif or %else will cause an error.
*/
COND_ELSE_TRUE, COND_ELSE_FALSE,
/*
* These states mean that we're not emitting now, and also that
* nothing until %endif will be emitted at all. COND_DONE is
* used when we've had our moment of emission
* and have now started seeing %elifs. COND_NEVER is used when
* the condition construct in question is contained within a
* non-emitting branch of a larger condition construct,
* or if there is an error.
*/
COND_DONE, COND_NEVER
};
#define emitting(x) ( (x) == COND_IF_TRUE || (x) == COND_ELSE_TRUE )
/*
* These defines are used as the possible return values for do_directive
*/
#define NO_DIRECTIVE_FOUND 0
#define DIRECTIVE_FOUND 1
/*
* This define sets the upper limit for smacro and recursive mmacro
* expansions
*/
#define DEADMAN_LIMIT (1 << 20)
/* max reps */
#define REP_LIMIT ((INT64_C(1) << 62))
/*
* Condition codes. Note that we use c_ prefix not C_ because C_ is
* used in nasm.h for the "real" condition codes. At _this_ level,
* we treat CXZ and ECXZ as condition codes, albeit non-invertible
* ones, so we need a different enum...
*/
static const char * const conditions[] = {
"a", "ae", "b", "be", "c", "cxz", "e", "ecxz", "g", "ge", "l", "le",
"na", "nae", "nb", "nbe", "nc", "ne", "ng", "nge", "nl", "nle", "no",
"np", "ns", "nz", "o", "p", "pe", "po", "rcxz", "s", "z"
};
enum pp_conds {
c_A, c_AE, c_B, c_BE, c_C, c_CXZ, c_E, c_ECXZ, c_G, c_GE, c_L, c_LE,
c_NA, c_NAE, c_NB, c_NBE, c_NC, c_NE, c_NG, c_NGE, c_NL, c_NLE, c_NO,
c_NP, c_NS, c_NZ, c_O, c_P, c_PE, c_PO, c_RCXZ, c_S, c_Z,
c_none = -1
};
static const enum pp_conds inverse_ccs[] = {
c_NA, c_NAE, c_NB, c_NBE, c_NC, -1, c_NE, -1, c_NG, c_NGE, c_NL, c_NLE,
c_A, c_AE, c_B, c_BE, c_C, c_E, c_G, c_GE, c_L, c_LE, c_O, c_P, c_S,
c_Z, c_NO, c_NP, c_PO, c_PE, -1, c_NS, c_NZ
};
/*
* Directive names.
*/
/* If this is a an IF, ELIF, ELSE or ENDIF keyword */
static int is_condition(enum preproc_token arg)
{
return PP_IS_COND(arg) || (arg == PP_ELSE) || (arg == PP_ENDIF);
}
/* For TASM compatibility we need to be able to recognise TASM compatible
* conditional compilation directives. Using the NASM pre-processor does
* not work, so we look for them specifically from the following list and
* then jam in the equivalent NASM directive into the input stream.
*/
enum {
TM_ARG, TM_ELIF, TM_ELSE, TM_ENDIF, TM_IF, TM_IFDEF, TM_IFDIFI,
TM_IFNDEF, TM_INCLUDE, TM_LOCAL
};
static const char * const tasm_directives[] = {
"arg", "elif", "else", "endif", "if", "ifdef", "ifdifi",
"ifndef", "include", "local"
};
static int StackSize = 4;
static const char *StackPointer = "ebp";
static int ArgOffset = 8;
static int LocalOffset = 0;
static Context *cstk;
static Include *istk;
static IncPath *ipath = NULL;
static int pass; /* HACK: pass 0 = generate dependencies only */
static StrList **dephead;
static uint64_t unique; /* unique identifier numbers */
static Line *predef = NULL;
static bool do_predef;
/*
* The current set of multi-line macros we have defined.
*/
static struct hash_table mmacros;
/*
* The current set of single-line macros we have defined.
*/
static struct hash_table smacros;
/*
* The multi-line macro we are currently defining, or the %rep
* block we are currently reading, if any.
*/
static MMacro *defining;
static uint64_t nested_mac_count;
static uint64_t nested_rep_count;
/*
* The number of macro parameters to allocate space for at a time.
*/
#define PARAM_DELTA 16
/*
* The standard macro set: defined in macros.c in a set of arrays.
* This gives our position in any macro set, while we are processing it.
* The stdmacset is an array of such macro sets.
*/
static macros_t *stdmacpos;
static macros_t **stdmacnext;
static macros_t *stdmacros[8];
static macros_t *extrastdmac;
/*
* Tokens are allocated in blocks to improve speed
*/
#define TOKEN_BLOCKSIZE 4096
static Token *freeTokens = NULL;
struct Blocks {
Blocks *next;
void *chunk;
};
static Blocks blocks = { NULL, NULL };
/*
* Forward declarations.
*/
static void pp_add_stdmac(macros_t *macros);
static Token *expand_mmac_params(Token * tline);
static Token *expand_smacro(Token * tline);
static Token *expand_id(Token * tline);
static Context *get_ctx(const char *name, const char **namep);
static void make_tok_num(Token * tok, int64_t val);
static void pp_verror(int severity, const char *fmt, va_list ap);
static vefunc real_verror;
static void *new_Block(size_t size);
static void delete_Blocks(void);
static Token *new_Token(Token * next, enum pp_token_type type,
const char *text, int txtlen);
static Token *delete_Token(Token * t);
/*
* Macros for safe checking of token pointers, avoid *(NULL)
*/
#define tok_type_(x,t) ((x) && (x)->type == (t))
#define skip_white_(x) if (tok_type_((x), TOK_WHITESPACE)) (x)=(x)->next
#define tok_is_(x,v) (tok_type_((x), TOK_OTHER) && !strcmp((x)->text,(v)))
#define tok_isnt_(x,v) ((x) && ((x)->type!=TOK_OTHER || strcmp((x)->text,(v))))
/*
* nasm_unquote with error if the string contains NUL characters.
* If the string contains NUL characters, issue an error and return
* the C len, i.e. truncate at the NUL.
*/
static size_t nasm_unquote_cstr(char *qstr, enum preproc_token directive)
{
size_t len = nasm_unquote(qstr, NULL);
size_t clen = strlen(qstr);
if (len != clen)
nasm_error(ERR_NONFATAL, "NUL character in `%s' directive",
pp_directives[directive]);
return clen;
}
/*
* In-place reverse a list of tokens.
*/
static Token *reverse_tokens(Token *t)
{
Token *prev = NULL;
Token *next;
while (t) {
next = t->next;
t->next = prev;
prev = t;
t = next;
}
return prev;
}
/*
* Handle TASM specific directives, which do not contain a % in
* front of them. We do it here because I could not find any other
* place to do it for the moment, and it is a hack (ideally it would
* be nice to be able to use the NASM pre-processor to do it).
*/
static char *check_tasm_directive(char *line)
{
int32_t i, j, k, m, len;
char *p, *q, *oldline, oldchar;
p = nasm_skip_spaces(line);
/* Binary search for the directive name */
i = -1;
j = ARRAY_SIZE(tasm_directives);
q = nasm_skip_word(p);
len = q - p;
if (len) {
oldchar = p[len];
p[len] = 0;
while (j - i > 1) {
k = (j + i) / 2;
m = nasm_stricmp(p, tasm_directives[k]);
if (m == 0) {
/* We have found a directive, so jam a % in front of it
* so that NASM will then recognise it as one if it's own.
*/
p[len] = oldchar;
len = strlen(p);
oldline = line;
line = nasm_malloc(len + 2);
line[0] = '%';
if (k == TM_IFDIFI) {
/*
* NASM does not recognise IFDIFI, so we convert
* it to %if 0. This is not used in NASM
* compatible code, but does need to parse for the
* TASM macro package.
*/
strcpy(line + 1, "if 0");
} else {
memcpy(line + 1, p, len + 1);
}
nasm_free(oldline);
return line;
} else if (m < 0) {
j = k;
} else
i = k;
}
p[len] = oldchar;
}
return line;
}
/*
* The pre-preprocessing stage... This function translates line
* number indications as they emerge from GNU cpp (`# lineno "file"
* flags') into NASM preprocessor line number indications (`%line
* lineno file').
*/
static char *prepreproc(char *line)
{
int lineno, fnlen;
char *fname, *oldline;
if (line[0] == '#' && line[1] == ' ') {
oldline = line;
fname = oldline + 2;
lineno = atoi(fname);
fname += strspn(fname, "0123456789 ");
if (*fname == '"')
fname++;
fnlen = strcspn(fname, "\"");
line = nasm_malloc(20 + fnlen);
snprintf(line, 20 + fnlen, "%%line %d %.*s", lineno, fnlen, fname);
nasm_free(oldline);
}
if (tasm_compatible_mode)
return check_tasm_directive(line);
return line;
}
/*
* Free a linked list of tokens.
*/
static void free_tlist(Token * list)
{
while (list)
list = delete_Token(list);
}
/*
* Free a linked list of lines.
*/
static void free_llist(Line * list)
{
Line *l, *tmp;
list_for_each_safe(l, tmp, list) {
free_tlist(l->first);
nasm_free(l);
}
}
/*
* Free an MMacro
*/
static void free_mmacro(MMacro * m)
{
nasm_free(m->name);
free_tlist(m->dlist);
nasm_free(m->defaults);
free_llist(m->expansion);
nasm_free(m);
}
/*
* Free all currently defined macros, and free the hash tables
*/
static void free_smacro_table(struct hash_table *smt)
{
SMacro *s, *tmp;
const char *key;
struct hash_tbl_node *it = NULL;
while ((s = hash_iterate(smt, &it, &key)) != NULL) {
nasm_free((void *)key);
list_for_each_safe(s, tmp, s) {
nasm_free(s->name);
free_tlist(s->expansion);
nasm_free(s);
}
}
hash_free(smt);
}
static void free_mmacro_table(struct hash_table *mmt)
{
MMacro *m, *tmp;
const char *key;
struct hash_tbl_node *it = NULL;
it = NULL;
while ((m = hash_iterate(mmt, &it, &key)) != NULL) {
nasm_free((void *)key);
list_for_each_safe(m ,tmp, m)
free_mmacro(m);
}
hash_free(mmt);
}
static void free_macros(void)
{
free_smacro_table(&smacros);
free_mmacro_table(&mmacros);
}
/*
* Initialize the hash tables
*/
static void init_macros(void)
{
hash_init(&smacros, HASH_LARGE);
hash_init(&mmacros, HASH_LARGE);
}
/*
* Pop the context stack.
*/
static void ctx_pop(void)
{
Context *c = cstk;
cstk = cstk->next;
free_smacro_table(&c->localmac);
nasm_free(c->name);
nasm_free(c);
}
/*
* Search for a key in the hash index; adding it if necessary
* (in which case we initialize the data pointer to NULL.)
*/
static void **
hash_findi_add(struct hash_table *hash, const char *str)
{
struct hash_insert hi;
void **r;
char *strx;
r = hash_findi(hash, str, &hi);
if (r)
return r;
strx = nasm_strdup(str); /* Use a more efficient allocator here? */
return hash_add(&hi, strx, NULL);
}
/*
* Like hash_findi, but returns the data element rather than a pointer
* to it. Used only when not adding a new element, hence no third
* argument.
*/
static void *
hash_findix(struct hash_table *hash, const char *str)
{
void **p;
p = hash_findi(hash, str, NULL);
return p ? *p : NULL;
}
/*
* read line from standart macros set,
* if there no more left -- return NULL
*/
static char *line_from_stdmac(void)
{
unsigned char c;
const unsigned char *p = stdmacpos;
char *line, *q;
size_t len = 0;
if (!stdmacpos)
return NULL;
while ((c = *p++)) {
if (c >= 0x80)
len += pp_directives_len[c - 0x80] + 1;
else
len++;
}
line = nasm_malloc(len + 1);
q = line;
while ((c = *stdmacpos++)) {
if (c >= 0x80) {
memcpy(q, pp_directives[c - 0x80], pp_directives_len[c - 0x80]);
q += pp_directives_len[c - 0x80];
*q++ = ' ';
} else {
*q++ = c;
}
}
stdmacpos = p;
*q = '\0';
if (!*stdmacpos) {
/* This was the last of this particular macro set */
stdmacpos = NULL;
if (*stdmacnext) {
stdmacpos = *stdmacnext++;
} else if (do_predef) {
Line *pd, *l;
Token *head, **tail, *t;
/*
* Nasty hack: here we push the contents of
* `predef' on to the top-level expansion stack,
* since this is the most convenient way to
* implement the pre-include and pre-define
* features.
*/
list_for_each(pd, predef) {
head = NULL;
tail = &head;
list_for_each(t, pd->first) {
*tail = new_Token(NULL, t->type, t->text, 0);
tail = &(*tail)->next;
}
l = nasm_malloc(sizeof(Line));
l->next = istk->expansion;
l->first = head;
l->finishes = NULL;
istk->expansion = l;
}
do_predef = false;
}
}
return line;
}
static char *read_line(void)
{
unsigned int size, c, next;
const unsigned int delta = 512;
const unsigned int pad = 8;
unsigned int nr_cont = 0;
bool cont = false;
char *buffer, *p;
/* Standart macros set (predefined) goes first */
p = line_from_stdmac();
if (p)
return p;
size = delta;
p = buffer = nasm_malloc(size);
for (;;) {
c = fgetc(istk->fp);
if ((int)(c) == EOF) {
p[0] = 0;
break;
}
switch (c) {
case '\r':
next = fgetc(istk->fp);
if (next != '\n')
ungetc(next, istk->fp);
if (cont) {
cont = false;
continue;
}
break;
case '\n':
if (cont) {
cont = false;
continue;
}
break;
case '\\':
next = fgetc(istk->fp);
ungetc(next, istk->fp);
if (next == '\r' || next == '\n') {
cont = true;
nr_cont++;
continue;
}
break;
}
if (c == '\r' || c == '\n') {
*p++ = 0;
break;
}
if (p >= (buffer + size - pad)) {
buffer = nasm_realloc(buffer, size + delta);
p = buffer + size - pad;
size += delta;
}
*p++ = (unsigned char)c;
}
if (p == buffer) {
nasm_free(buffer);
return NULL;
}
src_set_linnum(src_get_linnum() + istk->lineinc +
(nr_cont * istk->lineinc));
/*
* Handle spurious ^Z, which may be inserted into source files
* by some file transfer utilities.
*/
buffer[strcspn(buffer, "\032")] = '\0';
lfmt->line(LIST_READ, buffer);
return buffer;
}
/*
* Tokenize a line of text. This is a very simple process since we
* don't need to parse the value out of e.g. numeric tokens: we
* simply split one string into many.
*/
static Token *tokenize(char *line)
{
char c, *p = line;
enum pp_token_type type;
Token *list = NULL;
Token *t, **tail = &list;
while (*line) {
p = line;
if (*p == '%') {
p++;
if (*p == '+' && !nasm_isdigit(p[1])) {
p++;
type = TOK_PASTE;
} else if (nasm_isdigit(*p) ||
((*p == '-' || *p == '+') && nasm_isdigit(p[1]))) {
do {
p++;
}
while (nasm_isdigit(*p));
type = TOK_PREPROC_ID;
} else if (*p == '{') {
p++;
while (*p) {
if (*p == '}')
break;
p[-1] = *p;
p++;
}
if (*p != '}')
nasm_error(ERR_WARNING | ERR_PASS1,
"unterminated %%{ construct");
p[-1] = '\0';
if (*p)
p++;
type = TOK_PREPROC_ID;
} else if (*p == '[') {
int lvl = 1;
line += 2; /* Skip the leading %[ */
p++;
while (lvl && (c = *p++)) {
switch (c) {
case ']':
lvl--;
break;
case '%':
if (*p == '[')
lvl++;
break;
case '\'':
case '\"':
case '`':
p = nasm_skip_string(p - 1) + 1;
break;
default:
break;
}
}
p--;
if (*p)
*p++ = '\0';
if (lvl)
nasm_error(ERR_NONFATAL|ERR_PASS1,
"unterminated %%[ construct");
type = TOK_INDIRECT;
} else if (*p == '?') {
type = TOK_PREPROC_Q; /* %? */
p++;
if (*p == '?') {
type = TOK_PREPROC_QQ; /* %?? */
p++;
}
} else if (*p == '!') {
type = TOK_PREPROC_ID;
p++;
if (isidchar(*p)) {
do {
p++;
}
while (isidchar(*p));
} else if (*p == '\'' || *p == '\"' || *p == '`') {
p = nasm_skip_string(p);
if (*p)
p++;
else
nasm_error(ERR_NONFATAL|ERR_PASS1,
"unterminated %%! string");
} else {
/* %! without string or identifier */
type = TOK_OTHER; /* Legacy behavior... */
}
} else if (isidchar(*p) ||
((*p == '!' || *p == '%' || *p == '$') &&
isidchar(p[1]))) {
do {
p++;
}
while (isidchar(*p));
type = TOK_PREPROC_ID;
} else {
type = TOK_OTHER;
if (*p == '%')
p++;
}
} else if (isidstart(*p) || (*p == '$' && isidstart(p[1]))) {
type = TOK_ID;
p++;
while (*p && isidchar(*p))
p++;
} else if (*p == '\'' || *p == '"' || *p == '`') {
/*
* A string token.
*/
type = TOK_STRING;
p = nasm_skip_string(p);
if (*p) {
p++;
} else {
nasm_error(ERR_WARNING|ERR_PASS1, "unterminated string");
/* Handling unterminated strings by UNV */
/* type = -1; */
}
} else if (p[0] == '$' && p[1] == '$') {
type = TOK_OTHER; /* TOKEN_BASE */
p += 2;
} else if (isnumstart(*p)) {
bool is_hex = false;
bool is_float = false;
bool has_e = false;
char c, *r;
/*
* A numeric token.
*/
if (*p == '$') {
p++;
is_hex = true;
}
for (;;) {
c = *p++;
if (!is_hex && (c == 'e' || c == 'E')) {
has_e = true;
if (*p == '+' || *p == '-') {
/*
* e can only be followed by +/- if it is either a
* prefixed hex number or a floating-point number
*/
p++;
is_float = true;
}
} else if (c == 'H' || c == 'h' || c == 'X' || c == 'x') {
is_hex = true;
} else if (c == 'P' || c == 'p') {
is_float = true;
if (*p == '+' || *p == '-')
p++;
} else if (isnumchar(c))
; /* just advance */
else if (c == '.') {
/*
* we need to deal with consequences of the legacy
* parser, like "1.nolist" being two tokens
* (TOK_NUMBER, TOK_ID) here; at least give it
* a shot for now. In the future, we probably need
* a flex-based scanner with proper pattern matching
* to do it as well as it can be done. Nothing in
* the world is going to help the person who wants
* 0x123.p16 interpreted as two tokens, though.
*/
r = p;
while (*r == '_')
r++;
if (nasm_isdigit(*r) || (is_hex && nasm_isxdigit(*r)) ||
(!is_hex && (*r == 'e' || *r == 'E')) ||
(*r == 'p' || *r == 'P')) {
p = r;
is_float = true;
} else
break; /* Terminate the token */
} else
break;
}
p--; /* Point to first character beyond number */
if (p == line+1 && *line == '$') {
type = TOK_OTHER; /* TOKEN_HERE */
} else {
if (has_e && !is_hex) {
/* 1e13 is floating-point, but 1e13h is not */
is_float = true;
}
type = is_float ? TOK_FLOAT : TOK_NUMBER;
}
} else if (nasm_isspace(*p)) {
type = TOK_WHITESPACE;
p = nasm_skip_spaces(p);
/*
* Whitespace just before end-of-line is discarded by
* pretending it's a comment; whitespace just before a
* comment gets lumped into the comment.
*/
if (!*p || *p == ';') {
type = TOK_COMMENT;
while (*p)
p++;
}
} else if (*p == ';') {
type = TOK_COMMENT;
while (*p)
p++;
} else {
/*
* Anything else is an operator of some kind. We check
* for all the double-character operators (>>, <<, //,
* %%, <=, >=, ==, !=, <>, &&, ||, ^^), but anything
* else is a single-character operator.
*/
type = TOK_OTHER;
if ((p[0] == '>' && p[1] == '>') ||
(p[0] == '<' && p[1] == '<') ||
(p[0] == '/' && p[1] == '/') ||
(p[0] == '<' && p[1] == '=') ||
(p[0] == '>' && p[1] == '=') ||
(p[0] == '=' && p[1] == '=') ||
(p[0] == '!' && p[1] == '=') ||
(p[0] == '<' && p[1] == '>') ||
(p[0] == '&' && p[1] == '&') ||
(p[0] == '|' && p[1] == '|') ||
(p[0] == '^' && p[1] == '^')) {
p++;
}
p++;
}
/* Handling unterminated string by UNV */
/*if (type == -1)
{
*tail = t = new_Token(NULL, TOK_STRING, line, p-line+1);
t->text[p-line] = *line;
tail = &t->next;
}
else */
if (type != TOK_COMMENT) {
*tail = t = new_Token(NULL, type, line, p - line);
tail = &t->next;
}
line = p;
}
return list;
}
/*
* this function allocates a new managed block of memory and
* returns a pointer to the block. The managed blocks are
* deleted only all at once by the delete_Blocks function.
*/
static void *new_Block(size_t size)
{
Blocks *b = &blocks;
/* first, get to the end of the linked list */
while (b->next)
b = b->next;
/* now allocate the requested chunk */
b->chunk = nasm_malloc(size);
/* now allocate a new block for the next request */
b->next = nasm_zalloc(sizeof(Blocks));
return b->chunk;
}
/*
* this function deletes all managed blocks of memory
*/
static void delete_Blocks(void)
{
Blocks *a, *b = &blocks;
/*
* keep in mind that the first block, pointed to by blocks
* is a static and not dynamically allocated, so we don't
* free it.
*/
while (b) {
if (b->chunk)
nasm_free(b->chunk);
a = b;
b = b->next;
if (a != &blocks)
nasm_free(a);
}
memset(&blocks, 0, sizeof(blocks));
}
/*
* this function creates a new Token and passes a pointer to it
* back to the caller. It sets the type and text elements, and
* also the a.mac and next elements to NULL.
*/
static Token *new_Token(Token * next, enum pp_token_type type,
const char *text, int txtlen)
{
Token *t;
int i;
if (!freeTokens) {
freeTokens = (Token *) new_Block(TOKEN_BLOCKSIZE * sizeof(Token));
for (i = 0; i < TOKEN_BLOCKSIZE - 1; i++)
freeTokens[i].next = &freeTokens[i + 1];
freeTokens[i].next = NULL;
}
t = freeTokens;
freeTokens = t->next;
t->next = next;
t->a.mac = NULL;
t->type = type;
if (type == TOK_WHITESPACE || !text) {
t->text = NULL;
} else {
if (txtlen == 0)
txtlen = strlen(text);
t->text = nasm_malloc(txtlen+1);
memcpy(t->text, text, txtlen);
t->text[txtlen] = '\0';
}
return t;
}
static Token *delete_Token(Token * t)
{
Token *next = t->next;
nasm_free(t->text);
t->next = freeTokens;
freeTokens = t;
return next;
}
/*
* Convert a line of tokens back into text.
* If expand_locals is not zero, identifiers of the form "%$*xxx"
* will be transformed into ..@ctxnum.xxx
*/
static char *detoken(Token * tlist, bool expand_locals)
{
Token *t;
char *line, *p;
const char *q;
int len = 0;
list_for_each(t, tlist) {
if (t->type == TOK_PREPROC_ID && t->text[1] == '!') {
char *v;
char *q = t->text;
v = t->text + 2;
if (*v == '\'' || *v == '\"' || *v == '`') {
size_t len = nasm_unquote(v, NULL);
size_t clen = strlen(v);
if (len != clen) {
nasm_error(ERR_NONFATAL | ERR_PASS1,
"NUL character in %%! string");
v = NULL;
}
}
if (v) {
char *p = getenv(v);
if (!p) {
nasm_error(ERR_NONFATAL | ERR_PASS1,
"nonexistent environment variable `%s'", v);
/*
* FIXME We better should investigate if accessing
* ->text[1] without ->text[0] is safe enough.
*/
t->text = nasm_zalloc(2);
} else
t->text = nasm_strdup(p);
}
nasm_free(q);
}
/* Expand local macros here and not during preprocessing */
if (expand_locals &&
t->type == TOK_PREPROC_ID && t->text &&
t->text[0] == '%' && t->text[1] == '$') {
const char *q;
char *p;
Context *ctx = get_ctx(t->text, &q);
if (ctx) {
char buffer[40];
snprintf(buffer, sizeof(buffer), "..@%"PRIu32".", ctx->number);
p = nasm_strcat(buffer, q);
nasm_free(t->text);
t->text = p;
}
}
if (t->type == TOK_WHITESPACE)
len++;
else if (t->text)
len += strlen(t->text);
}
p = line = nasm_malloc(len + 1);
list_for_each(t, tlist) {
if (t->type == TOK_WHITESPACE) {
*p++ = ' ';
} else if (t->text) {
q = t->text;
while (*q)
*p++ = *q++;
}
}
*p = '\0';
return line;
}
/*
* A scanner, suitable for use by the expression evaluator, which
* operates on a line of Tokens. Expects a pointer to a pointer to
* the first token in the line to be passed in as its private_data
* field.
*
* FIX: This really needs to be unified with stdscan.
*/
static int ppscan(void *private_data, struct tokenval *tokval)
{
Token **tlineptr = private_data;
Token *tline;
char ourcopy[MAX_KEYWORD+1], *p, *r, *s;
do {
tline = *tlineptr;
*tlineptr = tline ? tline->next : NULL;
} while (tline && (tline->type == TOK_WHITESPACE ||
tline->type == TOK_COMMENT));
if (!tline)
return tokval->t_type = TOKEN_EOS;
tokval->t_charptr = tline->text;
if (tline->text[0] == '$' && !tline->text[1])
return tokval->t_type = TOKEN_HERE;
if (tline->text[0] == '$' && tline->text[1] == '$' && !tline->text[2])
return tokval->t_type = TOKEN_BASE;
if (tline->type == TOK_ID) {
p = tokval->t_charptr = tline->text;
if (p[0] == '$') {
tokval->t_charptr++;
return tokval->t_type = TOKEN_ID;
}
for (r = p, s = ourcopy; *r; r++) {
if (r >= p+MAX_KEYWORD)
return tokval->t_type = TOKEN_ID; /* Not a keyword */
*s++ = nasm_tolower(*r);
}
*s = '\0';
/* right, so we have an identifier sitting in temp storage. now,
* is it actually a register or instruction name, or what? */
return nasm_token_hash(ourcopy, tokval);
}
if (tline->type == TOK_NUMBER) {
bool rn_error;
tokval->t_integer = readnum(tline->text, &rn_error);
tokval->t_charptr = tline->text;
if (rn_error)
return tokval->t_type = TOKEN_ERRNUM;
else
return tokval->t_type = TOKEN_NUM;
}
if (tline->type == TOK_FLOAT) {
return tokval->t_type = TOKEN_FLOAT;
}
if (tline->type == TOK_STRING) {
char bq, *ep;
bq = tline->text[0];
tokval->t_charptr = tline->text;
tokval->t_inttwo = nasm_unquote(tline->text, &ep);
if (ep[0] != bq || ep[1] != '\0')
return tokval->t_type = TOKEN_ERRSTR;
else
return tokval->t_type = TOKEN_STR;
}
if (tline->type == TOK_OTHER) {
if (!strcmp(tline->text, "<<"))
return tokval->t_type = TOKEN_SHL;
if (!strcmp(tline->text, ">>"))
return tokval->t_type = TOKEN_SHR;
if (!strcmp(tline->text, "//"))
return tokval->t_type = TOKEN_SDIV;
if (!strcmp(tline->text, "%%"))
return tokval->t_type = TOKEN_SMOD;
if (!strcmp(tline->text, "=="))
return tokval->t_type = TOKEN_EQ;
if (!strcmp(tline->text, "<>"))
return tokval->t_type = TOKEN_NE;
if (!strcmp(tline->text, "!="))
return tokval->t_type = TOKEN_NE;
if (!strcmp(tline->text, "<="))
return tokval->t_type = TOKEN_LE;
if (!strcmp(tline->text, ">="))
return tokval->t_type = TOKEN_GE;
if (!strcmp(tline->text, "&&"))
return tokval->t_type = TOKEN_DBL_AND;
if (!strcmp(tline->text, "^^"))
return tokval->t_type = TOKEN_DBL_XOR;
if (!strcmp(tline->text, "||"))
return tokval->t_type = TOKEN_DBL_OR;
}
/*
* We have no other options: just return the first character of
* the token text.
*/
return tokval->t_type = tline->text[0];
}
/*
* Compare a string to the name of an existing macro; this is a
* simple wrapper which calls either strcmp or nasm_stricmp
* depending on the value of the `casesense' parameter.
*/
static int mstrcmp(const char *p, const char *q, bool casesense)
{
return casesense ? strcmp(p, q) : nasm_stricmp(p, q);
}
/*
* Compare a string to the name of an existing macro; this is a
* simple wrapper which calls either strcmp or nasm_stricmp
* depending on the value of the `casesense' parameter.
*/
static int mmemcmp(const char *p, const char *q, size_t l, bool casesense)
{
return casesense ? memcmp(p, q, l) : nasm_memicmp(p, q, l);
}
/*
* Return the Context structure associated with a %$ token. Return
* NULL, having _already_ reported an error condition, if the
* context stack isn't deep enough for the supplied number of $
* signs.
*
* If "namep" is non-NULL, set it to the pointer to the macro name
* tail, i.e. the part beyond %$...
*/
static Context *get_ctx(const char *name, const char **namep)
{
Context *ctx;
int i;
if (namep)
*namep = name;
if (!name || name[0] != '%' || name[1] != '$')
return NULL;
if (!cstk) {
nasm_error(ERR_NONFATAL, "`%s': context stack is empty", name);
return NULL;
}
name += 2;
ctx = cstk;
i = 0;
while (ctx && *name == '$') {
name++;
i++;
ctx = ctx->next;
}
if (!ctx) {
nasm_error(ERR_NONFATAL, "`%s': context stack is only"
" %d level%s deep", name, i, (i == 1 ? "" : "s"));
return NULL;
}
if (namep)
*namep = name;
return ctx;
}
/*
* Open an include file. This routine must always return a valid
* file pointer if it returns - it's responsible for throwing an
* ERR_FATAL and bombing out completely if not. It should also try
* the include path one by one until it finds the file or reaches
* the end of the path.
*
* Note: for INC_PROBE the function returns NULL at all times;
* instead look for the
*/
enum incopen_mode {
INC_NEEDED, /* File must exist */
INC_OPTIONAL, /* Missing is OK */
INC_PROBE /* Only an existence probe */
};
/* This is conducts a full pathname search */
static FILE *inc_fopen_search(const char *file, StrList **slpath,
enum incopen_mode omode, enum file_flags fmode)
{
FILE *fp;
char *prefix = "";
const IncPath *ip = ipath;
int len = strlen(file);
size_t prefix_len = 0;
StrList *sl;
size_t path_len;
bool found;
while (1) {
path_len = prefix_len + len + 1;
sl = nasm_malloc(path_len + sizeof sl->next);
memcpy(sl->str, prefix, prefix_len);
memcpy(sl->str+prefix_len, file, len+1);
sl->next = NULL;
if (omode == INC_PROBE) {
fp = NULL;
found = nasm_file_exists(sl->str);
} else {
fp = nasm_open_read(sl->str, fmode);
found = (fp != NULL);
}
if (found) {
*slpath = sl;
return fp;
}
nasm_free(sl);
if (!ip)
return NULL;
prefix = ip->path;
prefix_len = strlen(prefix);
ip = ip->next;
}
}
/*
* Open a file, or test for the presence of one (depending on omode),
* considering the include path.
*/
static FILE *inc_fopen(const char *file,
StrList **dhead,
const char **found_path,
enum incopen_mode omode,
enum file_flags fmode)
{
StrList *sl;
struct hash_insert hi;
void **hp;
char *path;
FILE *fp = NULL;
hp = hash_find(&FileHash, file, &hi);
if (hp) {
path = *hp;
} else {
/* Need to do the actual path search */
size_t file_len;
sl = NULL;
fp = inc_fopen_search(file, &sl, omode, fmode);
file_len = strlen(file);
if (!sl) {
/* Store negative result for this file */
sl = nasm_malloc(file_len + 1 + sizeof sl->next);
memcpy(sl->str, file, file_len+1);
sl->next = NULL;
file = sl->str;
path = NULL;
} else {
path = sl->str;
file = strchr(path, '\0') - file_len;
}
hash_add(&hi, file, path); /* Positive or negative result */
/*
* Add file to dependency path. The in_list() is needed
* in case the file was already added with %depend.
*/
if (path || omode != INC_NEEDED)
nasm_add_to_strlist(dhead, sl);
}
if (!path) {
if (omode == INC_NEEDED)
nasm_fatal(0, "unable to open include file `%s'", file);
if (found_path)
*found_path = NULL;
return NULL;
}
if (!fp && omode != INC_PROBE)
fp = nasm_open_read(path, fmode);
if (found_path)
*found_path = path;
return fp;
}
/*
* Opens an include or input file. Public version, for use by modules
* that get a file:lineno pair and need to look at the file again
* (e.g. the CodeView debug backend). Returns NULL on failure.
*/
FILE *pp_input_fopen(const char *filename, enum file_flags mode)
{
return inc_fopen(filename, NULL, NULL, INC_OPTIONAL, mode);
}
/*
* Determine if we should warn on defining a single-line macro of
* name `name', with `nparam' parameters. If nparam is 0 or -1, will
* return true if _any_ single-line macro of that name is defined.
* Otherwise, will return true if a single-line macro with either
* `nparam' or no parameters is defined.
*
* If a macro with precisely the right number of parameters is
* defined, or nparam is -1, the address of the definition structure
* will be returned in `defn'; otherwise NULL will be returned. If `defn'
* is NULL, no action will be taken regarding its contents, and no
* error will occur.
*
* Note that this is also called with nparam zero to resolve
* `ifdef'.
*
* If you already know which context macro belongs to, you can pass
* the context pointer as first parameter; if you won't but name begins
* with %$ the context will be automatically computed. If all_contexts
* is true, macro will be searched in outer contexts as well.
*/
static bool
smacro_defined(Context * ctx, const char *name, int nparam, SMacro ** defn,
bool nocase)
{
struct hash_table *smtbl;
SMacro *m;
if (ctx) {
smtbl = &ctx->localmac;
} else if (name[0] == '%' && name[1] == '$') {
if (cstk)
ctx = get_ctx(name, &name);
if (!ctx)
return false; /* got to return _something_ */
smtbl = &ctx->localmac;
} else {
smtbl = &smacros;
}
m = (SMacro *) hash_findix(smtbl, name);
while (m) {
if (!mstrcmp(m->name, name, m->casesense && nocase) &&
(nparam <= 0 || m->nparam == 0 || nparam == (int) m->nparam)) {
if (defn) {
if (nparam == (int) m->nparam || nparam == -1)
*defn = m;
else
*defn = NULL;
}
return true;
}
m = m->next;
}
return false;
}
/*
* Count and mark off the parameters in a multi-line macro call.
* This is called both from within the multi-line macro expansion
* code, and also to mark off the default parameters when provided
* in a %macro definition line.
*/
static void count_mmac_params(Token * t, int *nparam, Token *** params)
{
int paramsize, brace;
*nparam = paramsize = 0;
*params = NULL;
while (t) {
/* +1: we need space for the final NULL */
if (*nparam+1 >= paramsize) {
paramsize += PARAM_DELTA;
*params = nasm_realloc(*params, sizeof(**params) * paramsize);
}
skip_white_(t);
brace = 0;
if (tok_is_(t, "{"))
brace++;
(*params)[(*nparam)++] = t;
if (brace) {
while (brace && (t = t->next) != NULL) {
if (tok_is_(t, "{"))
brace++;
else if (tok_is_(t, "}"))
brace--;
}
if (t) {
/*
* Now we've found the closing brace, look further
* for the comma.
*/
t = t->next;
skip_white_(t);
if (tok_isnt_(t, ",")) {
nasm_error(ERR_NONFATAL,
"braces do not enclose all of macro parameter");
while (tok_isnt_(t, ","))
t = t->next;
}
}
} else {
while (tok_isnt_(t, ","))
t = t->next;
}
if (t) { /* got a comma/brace */
t = t->next; /* eat the comma */
}
}
}
/*
* Determine whether one of the various `if' conditions is true or
* not.
*
* We must free the tline we get passed.
*/
static bool if_condition(Token * tline, enum preproc_token ct)
{
enum pp_conditional i = PP_COND(ct);
bool j;
Token *t, *tt, **tptr, *origline;
struct tokenval tokval;
expr *evalresult;
enum pp_token_type needtype;
char *p;
origline = tline;
switch (i) {
case PPC_IFCTX:
j = false; /* have we matched yet? */
while (true) {
skip_white_(tline);
if (!tline)
break;
if (tline->type != TOK_ID) {
nasm_error(ERR_NONFATAL,
"`%s' expects context identifiers", pp_directives[ct]);
free_tlist(origline);
return -1;
}
if (cstk && cstk->name && !nasm_stricmp(tline->text, cstk->name))
j = true;
tline = tline->next;
}
break;
case PPC_IFDEF:
j = false; /* have we matched yet? */
while (tline) {
skip_white_(tline);
if (!tline || (tline->type != TOK_ID &&
(tline->type != TOK_PREPROC_ID ||
tline->text[1] != '$'))) {
nasm_error(ERR_NONFATAL,
"`%s' expects macro identifiers", pp_directives[ct]);
goto fail;
}
if (smacro_defined(NULL, tline->text, 0, NULL, true))
j = true;
tline = tline->next;
}
break;
case PPC_IFENV:
tline = expand_smacro(tline);
j = false; /* have we matched yet? */
while (tline) {
skip_white_(tline);
if (!tline || (tline->type != TOK_ID &&
tline->type != TOK_STRING &&
(tline->type != TOK_PREPROC_ID ||
tline->text[1] != '!'))) {
nasm_error(ERR_NONFATAL,
"`%s' expects environment variable names",
pp_directives[ct]);
goto fail;
}
p = tline->text;
if (tline->type == TOK_PREPROC_ID)
p += 2; /* Skip leading %! */
if (*p == '\'' || *p == '\"' || *p == '`')
nasm_unquote_cstr(p, ct);
if (getenv(p))
j = true;
tline = tline->next;
}
break;
case PPC_IFIDN:
case PPC_IFIDNI:
tline = expand_smacro(tline);
t = tt = tline;
while (tok_isnt_(tt, ","))
tt = tt->next;
if (!tt) {
nasm_error(ERR_NONFATAL,
"`%s' expects two comma-separated arguments",
pp_directives[ct]);
goto fail;
}
tt = tt->next;
j = true; /* assume equality unless proved not */
while ((t->type != TOK_OTHER || strcmp(t->text, ",")) && tt) {
if (tt->type == TOK_OTHER && !strcmp(tt->text, ",")) {
nasm_error(ERR_NONFATAL, "`%s': more than one comma on line",
pp_directives[ct]);
goto fail;
}
if (t->type == TOK_WHITESPACE) {
t = t->next;
continue;
}
if (tt->type == TOK_WHITESPACE) {
tt = tt->next;
continue;
}
if (tt->type != t->type) {
j = false; /* found mismatching tokens */
break;
}
/* When comparing strings, need to unquote them first */
if (t->type == TOK_STRING) {
size_t l1 = nasm_unquote(t->text, NULL);
size_t l2 = nasm_unquote(tt->text, NULL);
if (l1 != l2) {
j = false;
break;
}
if (mmemcmp(t->text, tt->text, l1, i == PPC_IFIDN)) {
j = false;
break;
}
} else if (mstrcmp(tt->text, t->text, i == PPC_IFIDN) != 0) {
j = false; /* found mismatching tokens */
break;
}
t = t->next;
tt = tt->next;
}
if ((t->type != TOK_OTHER || strcmp(t->text, ",")) || tt)
j = false; /* trailing gunk on one end or other */
break;
case PPC_IFMACRO:
{
bool found = false;
MMacro searching, *mmac;
skip_white_(tline);
tline = expand_id(tline);
if (!tok_type_(tline, TOK_ID)) {
nasm_error(ERR_NONFATAL,
"`%s' expects a macro name", pp_directives[ct]);
goto fail;
}
searching.name = nasm_strdup(tline->text);
searching.casesense = true;
searching.plus = false;
searching.nolist = false;
searching.in_progress = 0;
searching.max_depth = 0;
searching.rep_nest = NULL;
searching.nparam_min = 0;
searching.nparam_max = INT_MAX;
tline = expand_smacro(tline->next);
skip_white_(tline);
if (!tline) {
} else if (!tok_type_(tline, TOK_NUMBER)) {
nasm_error(ERR_NONFATAL,
"`%s' expects a parameter count or nothing",
pp_directives[ct]);
} else {
searching.nparam_min = searching.nparam_max =
readnum(tline->text, &j);
if (j)
nasm_error(ERR_NONFATAL,
"unable to parse parameter count `%s'",
tline->text);
}
if (tline && tok_is_(tline->next, "-")) {
tline = tline->next->next;
if (tok_is_(tline, "*"))
searching.nparam_max = INT_MAX;
else if (!tok_type_(tline, TOK_NUMBER))
nasm_error(ERR_NONFATAL,
"`%s' expects a parameter count after `-'",
pp_directives[ct]);
else {
searching.nparam_max = readnum(tline->text, &j);
if (j)
nasm_error(ERR_NONFATAL,
"unable to parse parameter count `%s'",
tline->text);
if (searching.nparam_min > searching.nparam_max)
nasm_error(ERR_NONFATAL,
"minimum parameter count exceeds maximum");
}
}
if (tline && tok_is_(tline->next, "+")) {
tline = tline->next;
searching.plus = true;
}
mmac = (MMacro *) hash_findix(&mmacros, searching.name);
while (mmac) {
if (!strcmp(mmac->name, searching.name) &&
(mmac->nparam_min <= searching.nparam_max
|| searching.plus)
&& (searching.nparam_min <= mmac->nparam_max
|| mmac->plus)) {
found = true;
break;
}
mmac = mmac->next;
}
if (tline && tline->next)
nasm_error(ERR_WARNING|ERR_PASS1,
"trailing garbage after %%ifmacro ignored");
nasm_free(searching.name);
j = found;
break;
}
case PPC_IFID:
needtype = TOK_ID;
goto iftype;
case PPC_IFNUM:
needtype = TOK_NUMBER;
goto iftype;
case PPC_IFSTR:
needtype = TOK_STRING;
goto iftype;
iftype:
t = tline = expand_smacro(tline);
while (tok_type_(t, TOK_WHITESPACE) ||
(needtype == TOK_NUMBER &&
tok_type_(t, TOK_OTHER) &&
(t->text[0] == '-' || t->text[0] == '+') &&
!t->text[1]))
t = t->next;
j = tok_type_(t, needtype);
break;
case PPC_IFTOKEN:
t = tline = expand_smacro(tline);
while (tok_type_(t, TOK_WHITESPACE))
t = t->next;
j = false;
if (t) {
t = t->next; /* Skip the actual token */
while (tok_type_(t, TOK_WHITESPACE))
t = t->next;
j = !t; /* Should be nothing left */
}
break;
case PPC_IFEMPTY:
t = tline = expand_smacro(tline);
while (tok_type_(t, TOK_WHITESPACE))
t = t->next;
j = !t; /* Should be empty */
break;
case PPC_IF:
t = tline = expand_smacro(tline);
tptr = &t;
tokval.t_type = TOKEN_INVALID;
evalresult = evaluate(ppscan, tptr, &tokval,
NULL, pass | CRITICAL, NULL);
if (!evalresult)
return -1;
if (tokval.t_type)
nasm_error(ERR_WARNING|ERR_PASS1,
"trailing garbage after expression ignored");
if (!is_simple(evalresult)) {
nasm_error(ERR_NONFATAL,
"non-constant value given to `%s'", pp_directives[ct]);
goto fail;
}
j = reloc_value(evalresult) != 0;
break;
default:
nasm_error(ERR_FATAL,
"preprocessor directive `%s' not yet implemented",
pp_directives[ct]);
goto fail;
}
free_tlist(origline);
return j ^ PP_NEGATIVE(ct);
fail:
free_tlist(origline);
return -1;
}
/*
* Common code for defining an smacro
*/
static bool define_smacro(Context *ctx, const char *mname, bool casesense,
int nparam, Token *expansion)
{
SMacro *smac, **smhead;
struct hash_table *smtbl;
if (smacro_defined(ctx, mname, nparam, &smac, casesense)) {
if (!smac) {
nasm_error(ERR_WARNING|ERR_PASS1,
"single-line macro `%s' defined both with and"
" without parameters", mname);
/*
* Some instances of the old code considered this a failure,
* some others didn't. What is the right thing to do here?
*/
free_tlist(expansion);
return false; /* Failure */
} else {
/*
* We're redefining, so we have to take over an
* existing SMacro structure. This means freeing
* what was already in it.
*/
nasm_free(smac->name);
free_tlist(smac->expansion);
}
} else {
smtbl = ctx ? &ctx->localmac : &smacros;
smhead = (SMacro **) hash_findi_add(smtbl, mname);
smac = nasm_malloc(sizeof(SMacro));
smac->next = *smhead;
*smhead = smac;
}
smac->name = nasm_strdup(mname);
smac->casesense = casesense;
smac->nparam = nparam;
smac->expansion = expansion;
smac->in_progress = false;
return true; /* Success */
}
/*
* Undefine an smacro
*/
static void undef_smacro(Context *ctx, const char *mname)
{
SMacro **smhead, *s, **sp;
struct hash_table *smtbl;
smtbl = ctx ? &ctx->localmac : &smacros;
smhead = (SMacro **)hash_findi(smtbl, mname, NULL);
if (smhead) {
/*
* We now have a macro name... go hunt for it.
*/
sp = smhead;
while ((s = *sp) != NULL) {
if (!mstrcmp(s->name, mname, s->casesense)) {
*sp = s->next;
nasm_free(s->name);
free_tlist(s->expansion);
nasm_free(s);
} else {
sp = &s->next;
}
}
}
}
/*
* Parse a mmacro specification.
*/
static bool parse_mmacro_spec(Token *tline, MMacro *def, const char *directive)
{
bool err;
tline = tline->next;
skip_white_(tline);
tline = expand_id(tline);
if (!tok_type_(tline, TOK_ID)) {
nasm_error(ERR_NONFATAL, "`%s' expects a macro name", directive);
return false;
}
def->prev = NULL;
def->name = nasm_strdup(tline->text);
def->plus = false;
def->nolist = false;
def->in_progress = 0;
def->rep_nest = NULL;
def->nparam_min = 0;
def->nparam_max = 0;
tline = expand_smacro(tline->next);
skip_white_(tline);
if (!tok_type_(tline, TOK_NUMBER)) {
nasm_error(ERR_NONFATAL, "`%s' expects a parameter count", directive);
} else {
def->nparam_min = def->nparam_max =
readnum(tline->text, &err);
if (err)
nasm_error(ERR_NONFATAL,
"unable to parse parameter count `%s'", tline->text);
}
if (tline && tok_is_(tline->next, "-")) {
tline = tline->next->next;
if (tok_is_(tline, "*")) {
def->nparam_max = INT_MAX;
} else if (!tok_type_(tline, TOK_NUMBER)) {
nasm_error(ERR_NONFATAL,
"`%s' expects a parameter count after `-'", directive);
} else {
def->nparam_max = readnum(tline->text, &err);
if (err) {
nasm_error(ERR_NONFATAL, "unable to parse parameter count `%s'",
tline->text);
}
if (def->nparam_min > def->nparam_max) {
nasm_error(ERR_NONFATAL, "minimum parameter count exceeds maximum");
}
}
}
if (tline && tok_is_(tline->next, "+")) {
tline = tline->next;
def->plus = true;
}
if (tline && tok_type_(tline->next, TOK_ID) &&
!nasm_stricmp(tline->next->text, ".nolist")) {
tline = tline->next;
def->nolist = true;
}
/*
* Handle default parameters.
*/
if (tline && tline->next) {
def->dlist = tline->next;
tline->next = NULL;
count_mmac_params(def->dlist, &def->ndefs, &def->defaults);
} else {
def->dlist = NULL;
def->defaults = NULL;
}
def->expansion = NULL;
if (def->defaults && def->ndefs > def->nparam_max - def->nparam_min &&
!def->plus)
nasm_error(ERR_WARNING|ERR_PASS1|ERR_WARN_MDP,
"too many default macro parameters");
return true;
}
/*
* Decode a size directive
*/
static int parse_size(const char *str) {
static const char *size_names[] =
{ "byte", "dword", "oword", "qword", "tword", "word", "yword" };
static const int sizes[] =
{ 0, 1, 4, 16, 8, 10, 2, 32 };
return sizes[bsii(str, size_names, ARRAY_SIZE(size_names))+1];
}
/*
* Process a preprocessor %pragma directive. Currently there are none.
* Gets passed the token list starting with the "preproc" token from
* "%pragma preproc".
*/
static void do_pragma_preproc(Token *tline)
{
/* Skip to the real stuff */
tline = tline->next;
skip_white_(tline);
if (!tline)
return;
(void)tline; /* Nothing else to do at present */
}
/**
* find and process preprocessor directive in passed line
* Find out if a line contains a preprocessor directive, and deal
* with it if so.
*
* If a directive _is_ found, it is the responsibility of this routine
* (and not the caller) to free_tlist() the line.
*
* @param tline a pointer to the current tokeninzed line linked list
* @param output if this directive generated output
* @return DIRECTIVE_FOUND or NO_DIRECTIVE_FOUND
*
*/
static int do_directive(Token *tline, char **output)
{
enum preproc_token i;
int j;
bool err;
int nparam;
bool nolist;
bool casesense;
int k, m;
int offset;
char *p, *pp;
const char *found_path;
const char *mname;
Include *inc;
Context *ctx;
Cond *cond;
MMacro *mmac, **mmhead;
Token *t = NULL, *tt, *param_start, *macro_start, *last, **tptr, *origline;
Line *l;
struct tokenval tokval;
expr *evalresult;
MMacro *tmp_defining; /* Used when manipulating rep_nest */
int64_t count;
size_t len;
int severity;
*output = NULL; /* No output generated */
origline = tline;
skip_white_(tline);
if (!tline || !tok_type_(tline, TOK_PREPROC_ID) ||
(tline->text[1] == '%' || tline->text[1] == '$'
|| tline->text[1] == '!'))
return NO_DIRECTIVE_FOUND;
i = pp_token_hash(tline->text);
/*
* FIXME: We zap execution of PP_RMACRO, PP_IRMACRO, PP_EXITMACRO
* since they are known to be buggy at moment, we need to fix them
* in future release (2.09-2.10)
*/
if (i == PP_RMACRO || i == PP_IRMACRO || i == PP_EXITMACRO) {
nasm_error(ERR_NONFATAL, "unknown preprocessor directive `%s'",
tline->text);
return NO_DIRECTIVE_FOUND;
}
/*
* If we're in a non-emitting branch of a condition construct,
* or walking to the end of an already terminated %rep block,
* we should ignore all directives except for condition
* directives.
*/
if (((istk->conds && !emitting(istk->conds->state)) ||
(istk->mstk && !istk->mstk->in_progress)) && !is_condition(i)) {
return NO_DIRECTIVE_FOUND;
}
/*
* If we're defining a macro or reading a %rep block, we should
* ignore all directives except for %macro/%imacro (which nest),
* %endm/%endmacro, and (only if we're in a %rep block) %endrep.
* If we're in a %rep block, another %rep nests, so should be let through.
*/
if (defining && i != PP_MACRO && i != PP_IMACRO &&
i != PP_RMACRO && i != PP_IRMACRO &&
i != PP_ENDMACRO && i != PP_ENDM &&
(defining->name || (i != PP_ENDREP && i != PP_REP))) {
return NO_DIRECTIVE_FOUND;
}
if (defining) {
if (i == PP_MACRO || i == PP_IMACRO ||
i == PP_RMACRO || i == PP_IRMACRO) {
nested_mac_count++;
return NO_DIRECTIVE_FOUND;
} else if (nested_mac_count > 0) {
if (i == PP_ENDMACRO) {
nested_mac_count--;
return NO_DIRECTIVE_FOUND;
}
}
if (!defining->name) {
if (i == PP_REP) {
nested_rep_count++;
return NO_DIRECTIVE_FOUND;
} else if (nested_rep_count > 0) {
if (i == PP_ENDREP) {
nested_rep_count--;
return NO_DIRECTIVE_FOUND;
}
}
}
}
switch (i) {
case PP_INVALID:
nasm_error(ERR_NONFATAL, "unknown preprocessor directive `%s'",
tline->text);
return NO_DIRECTIVE_FOUND; /* didn't get it */
case PP_PRAGMA:
/*
* %pragma namespace options...
*
* The namespace "preproc" is reserved for the preprocessor;
* all other namespaces generate a [pragma] assembly directive.
*
* Invalid %pragmas are ignored and may have different
* meaning in future versions of NASM.
*/
tline = tline->next;
skip_white_(tline);
tline = expand_smacro(tline);
if (tok_type_(tline, TOK_ID)) {
if (!nasm_stricmp(tline->text, "preproc")) {
/* Preprocessor pragma */
do_pragma_preproc(tline);
} else {
/* Build the assembler directive */
t = new_Token(NULL, TOK_OTHER, "[", 1);
t->next = new_Token(NULL, TOK_ID, "pragma", 6);
t->next->next = new_Token(tline, TOK_WHITESPACE, NULL, 0);
tline = t;
for (t = tline; t->next; t = t->next)
;
t->next = new_Token(NULL, TOK_OTHER, "]", 1);
/* true here can be revisited in the future */
*output = detoken(tline, true);
}
}
free_tlist(origline);
return DIRECTIVE_FOUND;
case PP_STACKSIZE:
/* Directive to tell NASM what the default stack size is. The
* default is for a 16-bit stack, and this can be overriden with
* %stacksize large.
*/
tline = tline->next;
if (tline && tline->type == TOK_WHITESPACE)
tline = tline->next;
if (!tline || tline->type != TOK_ID) {
nasm_error(ERR_NONFATAL, "`%%stacksize' missing size parameter");
free_tlist(origline);
return DIRECTIVE_FOUND;
}
if (nasm_stricmp(tline->text, "flat") == 0) {
/* All subsequent ARG directives are for a 32-bit stack */
StackSize = 4;
StackPointer = "ebp";
ArgOffset = 8;
LocalOffset = 0;
} else if (nasm_stricmp(tline->text, "flat64") == 0) {
/* All subsequent ARG directives are for a 64-bit stack */
StackSize = 8;
StackPointer = "rbp";
ArgOffset = 16;
LocalOffset = 0;
} else if (nasm_stricmp(tline->text, "large") == 0) {
/* All subsequent ARG directives are for a 16-bit stack,
* far function call.
*/
StackSize = 2;
StackPointer = "bp";
ArgOffset = 4;
LocalOffset = 0;
} else if (nasm_stricmp(tline->text, "small") == 0) {
/* All subsequent ARG directives are for a 16-bit stack,
* far function call. We don't support near functions.
*/
StackSize = 2;
StackPointer = "bp";
ArgOffset = 6;
LocalOffset = 0;
} else {
nasm_error(ERR_NONFATAL, "`%%stacksize' invalid size type");
free_tlist(origline);
return DIRECTIVE_FOUND;
}
free_tlist(origline);
return DIRECTIVE_FOUND;
case PP_ARG:
/* TASM like ARG directive to define arguments to functions, in
* the following form:
*
* ARG arg1:WORD, arg2:DWORD, arg4:QWORD
*/
offset = ArgOffset;
do {
char *arg, directive[256];
int size = StackSize;
/* Find the argument name */
tline = tline->next;
if (tline && tline->type == TOK_WHITESPACE)
tline = tline->next;
if (!tline || tline->type != TOK_ID) {
nasm_error(ERR_NONFATAL, "`%%arg' missing argument parameter");
free_tlist(origline);
return DIRECTIVE_FOUND;
}
arg = tline->text;
/* Find the argument size type */
tline = tline->next;
if (!tline || tline->type != TOK_OTHER
|| tline->text[0] != ':') {
nasm_error(ERR_NONFATAL,
"Syntax error processing `%%arg' directive");
free_tlist(origline);
return DIRECTIVE_FOUND;
}
tline = tline->next;
if (!tline || tline->type != TOK_ID) {
nasm_error(ERR_NONFATAL, "`%%arg' missing size type parameter");
free_tlist(origline);
return DIRECTIVE_FOUND;
}
/* Allow macro expansion of type parameter */
tt = tokenize(tline->text);
tt = expand_smacro(tt);
size = parse_size(tt->text);
if (!size) {
nasm_error(ERR_NONFATAL,
"Invalid size type for `%%arg' missing directive");
free_tlist(tt);
free_tlist(origline);
return DIRECTIVE_FOUND;
}
free_tlist(tt);
/* Round up to even stack slots */
size = ALIGN(size, StackSize);
/* Now define the macro for the argument */
snprintf(directive, sizeof(directive), "%%define %s (%s+%d)",
arg, StackPointer, offset);
do_directive(tokenize(directive), output);
offset += size;
/* Move to the next argument in the list */
tline = tline->next;
if (tline && tline->type == TOK_WHITESPACE)
tline = tline->next;
} while (tline && tline->type == TOK_OTHER && tline->text[0] == ',');
ArgOffset = offset;
free_tlist(origline);
return DIRECTIVE_FOUND;
case PP_LOCAL:
/* TASM like LOCAL directive to define local variables for a
* function, in the following form:
*
* LOCAL local1:WORD, local2:DWORD, local4:QWORD = LocalSize
*
* The '= LocalSize' at the end is ignored by NASM, but is
* required by TASM to define the local parameter size (and used
* by the TASM macro package).
*/
offset = LocalOffset;
do {
char *local, directive[256];
int size = StackSize;
/* Find the argument name */
tline = tline->next;
if (tline && tline->type == TOK_WHITESPACE)
tline = tline->next;
if (!tline || tline->type != TOK_ID) {
nasm_error(ERR_NONFATAL,
"`%%local' missing argument parameter");
free_tlist(origline);
return DIRECTIVE_FOUND;
}
local = tline->text;
/* Find the argument size type */
tline = tline->next;
if (!tline || tline->type != TOK_OTHER
|| tline->text[0] != ':') {
nasm_error(ERR_NONFATAL,
"Syntax error processing `%%local' directive");
free_tlist(origline);
return DIRECTIVE_FOUND;
}
tline = tline->next;
if (!tline || tline->type != TOK_ID) {
nasm_error(ERR_NONFATAL,
"`%%local' missing size type parameter");
free_tlist(origline);
return DIRECTIVE_FOUND;
}
/* Allow macro expansion of type parameter */
tt = tokenize(tline->text);
tt = expand_smacro(tt);
size = parse_size(tt->text);
if (!size) {
nasm_error(ERR_NONFATAL,
"Invalid size type for `%%local' missing directive");
free_tlist(tt);
free_tlist(origline);
return DIRECTIVE_FOUND;
}
free_tlist(tt);
/* Round up to even stack slots */
size = ALIGN(size, StackSize);
offset += size; /* Negative offset, increment before */
/* Now define the macro for the argument */
snprintf(directive, sizeof(directive), "%%define %s (%s-%d)",
local, StackPointer, offset);
do_directive(tokenize(directive), output);
/* Now define the assign to setup the enter_c macro correctly */
snprintf(directive, sizeof(directive),
"%%assign %%$localsize %%$localsize+%d", size);
do_directive(tokenize(directive), output);
/* Move to the next argument in the list */
tline = tline->next;
if (tline && tline->type == TOK_WHITESPACE)
tline = tline->next;
} while (tline && tline->type == TOK_OTHER && tline->text[0] == ',');
LocalOffset = offset;
free_tlist(origline);
return DIRECTIVE_FOUND;
case PP_CLEAR:
if (tline->next)
nasm_error(ERR_WARNING|ERR_PASS1,
"trailing garbage after `%%clear' ignored");
free_macros();
init_macros();
free_tlist(origline);
return DIRECTIVE_FOUND;
case PP_DEPEND:
t = tline->next = expand_smacro(tline->next);
skip_white_(t);
if (!t || (t->type != TOK_STRING &&
t->type != TOK_INTERNAL_STRING)) {
nasm_error(ERR_NONFATAL, "`%%depend' expects a file name");
free_tlist(origline);
return DIRECTIVE_FOUND; /* but we did _something_ */
}
if (t->next)
nasm_error(ERR_WARNING|ERR_PASS1,
"trailing garbage after `%%depend' ignored");
p = t->text;
if (t->type != TOK_INTERNAL_STRING)
nasm_unquote_cstr(p, i);
nasm_add_string_to_strlist(dephead, p);
free_tlist(origline);
return DIRECTIVE_FOUND;
case PP_INCLUDE:
t = tline->next = expand_smacro(tline->next);
skip_white_(t);
if (!t || (t->type != TOK_STRING &&
t->type != TOK_INTERNAL_STRING)) {
nasm_error(ERR_NONFATAL, "`%%include' expects a file name");
free_tlist(origline);
return DIRECTIVE_FOUND; /* but we did _something_ */
}
if (t->next)
nasm_error(ERR_WARNING|ERR_PASS1,
"trailing garbage after `%%include' ignored");
p = t->text;
if (t->type != TOK_INTERNAL_STRING)
nasm_unquote_cstr(p, i);
inc = nasm_malloc(sizeof(Include));
inc->next = istk;
inc->conds = NULL;
found_path = NULL;
inc->fp = inc_fopen(p, dephead, &found_path,
pass == 0 ? INC_OPTIONAL : INC_NEEDED, NF_TEXT);
if (!inc->fp) {
/* -MG given but file not found */
nasm_free(inc);
} else {
inc->fname = src_set_fname(found_path ? found_path : p);
inc->lineno = src_set_linnum(0);
inc->lineinc = 1;
inc->expansion = NULL;
inc->mstk = NULL;
istk = inc;
lfmt->uplevel(LIST_INCLUDE);
}
free_tlist(origline);
return DIRECTIVE_FOUND;
case PP_USE:
{
static macros_t *use_pkg;
const char *pkg_macro = NULL;
tline = tline->next;
skip_white_(tline);
tline = expand_id(tline);
if (!tline || (tline->type != TOK_STRING &&
tline->type != TOK_INTERNAL_STRING &&
tline->type != TOK_ID)) {
nasm_error(ERR_NONFATAL, "`%%use' expects a package name");
free_tlist(origline);
return DIRECTIVE_FOUND; /* but we did _something_ */
}
if (tline->next)
nasm_error(ERR_WARNING|ERR_PASS1,
"trailing garbage after `%%use' ignored");
if (tline->type == TOK_STRING)
nasm_unquote_cstr(tline->text, i);
use_pkg = nasm_stdmac_find_package(tline->text);
if (!use_pkg)
nasm_error(ERR_NONFATAL, "unknown `%%use' package: %s", tline->text);
else
pkg_macro = (char *)use_pkg + 1; /* The first string will be <%define>__USE_*__ */
if (use_pkg && ! smacro_defined(NULL, pkg_macro, 0, NULL, true)) {
/* Not already included, go ahead and include it */
stdmacpos = use_pkg;
}
free_tlist(origline);
return DIRECTIVE_FOUND;
}
case PP_PUSH:
case PP_REPL:
case PP_POP:
tline = tline->next;
skip_white_(tline);
tline = expand_id(tline);
if (tline) {
if (!tok_type_(tline, TOK_ID)) {
nasm_error(ERR_NONFATAL, "`%s' expects a context identifier",
pp_directives[i]);
free_tlist(origline);
return DIRECTIVE_FOUND; /* but we did _something_ */
}
if (tline->next)
nasm_error(ERR_WARNING|ERR_PASS1,
"trailing garbage after `%s' ignored",
pp_directives[i]);
p = nasm_strdup(tline->text);
} else {
p = NULL; /* Anonymous */
}
if (i == PP_PUSH) {
ctx = nasm_malloc(sizeof(Context));
ctx->next = cstk;
hash_init(&ctx->localmac, HASH_SMALL);
ctx->name = p;
ctx->number = unique++;
cstk = ctx;
} else {
/* %pop or %repl */
if (!cstk) {
nasm_error(ERR_NONFATAL, "`%s': context stack is empty",
pp_directives[i]);
} else if (i == PP_POP) {
if (p && (!cstk->name || nasm_stricmp(p, cstk->name)))
nasm_error(ERR_NONFATAL, "`%%pop' in wrong context: %s, "
"expected %s",
cstk->name ? cstk->name : "anonymous", p);
else
ctx_pop();
} else {
/* i == PP_REPL */
nasm_free(cstk->name);
cstk->name = p;
p = NULL;
}
nasm_free(p);
}
free_tlist(origline);
return DIRECTIVE_FOUND;
case PP_FATAL:
severity = ERR_FATAL;
goto issue_error;
case PP_ERROR:
severity = ERR_NONFATAL;
goto issue_error;
case PP_WARNING:
severity = ERR_WARNING|ERR_WARN_USER;
goto issue_error;
issue_error:
{
/* Only error out if this is the final pass */
if (pass != 2 && i != PP_FATAL)
return DIRECTIVE_FOUND;
tline->next = expand_smacro(tline->next);
tline = tline->next;
skip_white_(tline);
t = tline ? tline->next : NULL;
skip_white_(t);
if (tok_type_(tline, TOK_STRING) && !t) {
/* The line contains only a quoted string */
p = tline->text;
nasm_unquote(p, NULL); /* Ignore NUL character truncation */
nasm_error(severity, "%s", p);
} else {
/* Not a quoted string, or more than a quoted string */
p = detoken(tline, false);
nasm_error(severity, "%s", p);
nasm_free(p);
}
free_tlist(origline);
return DIRECTIVE_FOUND;
}
CASE_PP_IF:
if (istk->conds && !emitting(istk->conds->state))
j = COND_NEVER;
else {
j = if_condition(tline->next, i);
tline->next = NULL; /* it got freed */
j = j < 0 ? COND_NEVER : j ? COND_IF_TRUE : COND_IF_FALSE;
}
cond = nasm_malloc(sizeof(Cond));
cond->next = istk->conds;
cond->state = j;
istk->conds = cond;
if(istk->mstk)
istk->mstk->condcnt ++;
free_tlist(origline);
return DIRECTIVE_FOUND;
CASE_PP_ELIF:
if (!istk->conds)
nasm_error(ERR_FATAL, "`%s': no matching `%%if'", pp_directives[i]);
switch(istk->conds->state) {
case COND_IF_TRUE:
istk->conds->state = COND_DONE;
break;
case COND_DONE:
case COND_NEVER:
break;
case COND_ELSE_TRUE:
case COND_ELSE_FALSE:
nasm_error(ERR_WARNING|ERR_PASS1|ERR_PP_PRECOND,
"`%%elif' after `%%else' ignored");
istk->conds->state = COND_NEVER;
break;
case COND_IF_FALSE:
/*
* IMPORTANT: In the case of %if, we will already have
* called expand_mmac_params(); however, if we're
* processing an %elif we must have been in a
* non-emitting mode, which would have inhibited
* the normal invocation of expand_mmac_params().
* Therefore, we have to do it explicitly here.
*/
j = if_condition(expand_mmac_params(tline->next), i);
tline->next = NULL; /* it got freed */
istk->conds->state =
j < 0 ? COND_NEVER : j ? COND_IF_TRUE : COND_IF_FALSE;
break;
}
free_tlist(origline);
return DIRECTIVE_FOUND;
case PP_ELSE:
if (tline->next)
nasm_error(ERR_WARNING|ERR_PASS1|ERR_PP_PRECOND,
"trailing garbage after `%%else' ignored");
if (!istk->conds)
nasm_fatal(0, "`%%else: no matching `%%if'");
switch(istk->conds->state) {
case COND_IF_TRUE:
case COND_DONE:
istk->conds->state = COND_ELSE_FALSE;
break;
case COND_NEVER:
break;
case COND_IF_FALSE:
istk->conds->state = COND_ELSE_TRUE;
break;
case COND_ELSE_TRUE:
case COND_ELSE_FALSE:
nasm_error(ERR_WARNING|ERR_PASS1|ERR_PP_PRECOND,
"`%%else' after `%%else' ignored.");
istk->conds->state = COND_NEVER;
break;
}
free_tlist(origline);
return DIRECTIVE_FOUND;
case PP_ENDIF:
if (tline->next)
nasm_error(ERR_WARNING|ERR_PASS1|ERR_PP_PRECOND,
"trailing garbage after `%%endif' ignored");
if (!istk->conds)
nasm_error(ERR_FATAL, "`%%endif': no matching `%%if'");
cond = istk->conds;
istk->conds = cond->next;
nasm_free(cond);
if(istk->mstk)
istk->mstk->condcnt --;
free_tlist(origline);
return DIRECTIVE_FOUND;
case PP_RMACRO:
case PP_IRMACRO:
case PP_MACRO:
case PP_IMACRO:
if (defining) {
nasm_error(ERR_FATAL, "`%s': already defining a macro",
pp_directives[i]);
return DIRECTIVE_FOUND;
}
defining = nasm_zalloc(sizeof(MMacro));
defining->max_depth =
(i == PP_RMACRO) || (i == PP_IRMACRO) ? DEADMAN_LIMIT : 0;
defining->casesense = (i == PP_MACRO) || (i == PP_RMACRO);
if (!parse_mmacro_spec(tline, defining, pp_directives[i])) {
nasm_free(defining);
defining = NULL;
return DIRECTIVE_FOUND;
}
src_get(&defining->xline, &defining->fname);
mmac = (MMacro *) hash_findix(&mmacros, defining->name);
while (mmac) {
if (!strcmp(mmac->name, defining->name) &&
(mmac->nparam_min <= defining->nparam_max
|| defining->plus)
&& (defining->nparam_min <= mmac->nparam_max
|| mmac->plus)) {
nasm_error(ERR_WARNING|ERR_PASS1,
"redefining multi-line macro `%s'", defining->name);
return DIRECTIVE_FOUND;
}
mmac = mmac->next;
}
free_tlist(origline);
return DIRECTIVE_FOUND;
case PP_ENDM:
case PP_ENDMACRO:
if (! (defining && defining->name)) {
nasm_error(ERR_NONFATAL, "`%s': not defining a macro", tline->text);
return DIRECTIVE_FOUND;
}
mmhead = (MMacro **) hash_findi_add(&mmacros, defining->name);
defining->next = *mmhead;
*mmhead = defining;
defining = NULL;
free_tlist(origline);
return DIRECTIVE_FOUND;
case PP_EXITMACRO:
/*
* We must search along istk->expansion until we hit a
* macro-end marker for a macro with a name. Then we
* bypass all lines between exitmacro and endmacro.
*/
list_for_each(l, istk->expansion)
if (l->finishes && l->finishes->name)
break;
if (l) {
/*
* Remove all conditional entries relative to this
* macro invocation. (safe to do in this context)
*/
for ( ; l->finishes->condcnt > 0; l->finishes->condcnt --) {
cond = istk->conds;
istk->conds = cond->next;
nasm_free(cond);
}
istk->expansion = l;
} else {
nasm_error(ERR_NONFATAL, "`%%exitmacro' not within `%%macro' block");
}
free_tlist(origline);
return DIRECTIVE_FOUND;
case PP_UNMACRO:
case PP_UNIMACRO:
{
MMacro **mmac_p;
MMacro spec;
spec.casesense = (i == PP_UNMACRO);
if (!parse_mmacro_spec(tline, &spec, pp_directives[i])) {
return DIRECTIVE_FOUND;
}
mmac_p = (MMacro **) hash_findi(&mmacros, spec.name, NULL);
while (mmac_p && *mmac_p) {
mmac = *mmac_p;
if (mmac->casesense == spec.casesense &&
!mstrcmp(mmac->name, spec.name, spec.casesense) &&
mmac->nparam_min == spec.nparam_min &&
mmac->nparam_max == spec.nparam_max &&
mmac->plus == spec.plus) {
*mmac_p = mmac->next;
free_mmacro(mmac);
} else {
mmac_p = &mmac->next;
}
}
free_tlist(origline);
free_tlist(spec.dlist);
return DIRECTIVE_FOUND;
}
case PP_ROTATE:
if (tline->next && tline->next->type == TOK_WHITESPACE)
tline = tline->next;
if (!tline->next) {
free_tlist(origline);
nasm_error(ERR_NONFATAL, "`%%rotate' missing rotate count");
return DIRECTIVE_FOUND;
}
t = expand_smacro(tline->next);
tline->next = NULL;
free_tlist(origline);
tline = t;
tptr = &t;
tokval.t_type = TOKEN_INVALID;
evalresult =
evaluate(ppscan, tptr, &tokval, NULL, pass, NULL);
free_tlist(tline);
if (!evalresult)
return DIRECTIVE_FOUND;
if (tokval.t_type)
nasm_error(ERR_WARNING|ERR_PASS1,
"trailing garbage after expression ignored");
if (!is_simple(evalresult)) {
nasm_error(ERR_NONFATAL, "non-constant value given to `%%rotate'");
return DIRECTIVE_FOUND;
}
mmac = istk->mstk;
while (mmac && !mmac->name) /* avoid mistaking %reps for macros */
mmac = mmac->next_active;
if (!mmac) {
nasm_error(ERR_NONFATAL, "`%%rotate' invoked outside a macro call");
} else if (mmac->nparam == 0) {
nasm_error(ERR_NONFATAL,
"`%%rotate' invoked within macro without parameters");
} else {
int rotate = mmac->rotate + reloc_value(evalresult);
rotate %= (int)mmac->nparam;
if (rotate < 0)
rotate += mmac->nparam;
mmac->rotate = rotate;
}
return DIRECTIVE_FOUND;
case PP_REP:
nolist = false;
do {
tline = tline->next;
} while (tok_type_(tline, TOK_WHITESPACE));
if (tok_type_(tline, TOK_ID) &&
nasm_stricmp(tline->text, ".nolist") == 0) {
nolist = true;
do {
tline = tline->next;
} while (tok_type_(tline, TOK_WHITESPACE));
}
if (tline) {
t = expand_smacro(tline);
tptr = &t;
tokval.t_type = TOKEN_INVALID;
evalresult =
evaluate(ppscan, tptr, &tokval, NULL, pass, NULL);
if (!evalresult) {
free_tlist(origline);
return DIRECTIVE_FOUND;
}
if (tokval.t_type)
nasm_error(ERR_WARNING|ERR_PASS1,
"trailing garbage after expression ignored");
if (!is_simple(evalresult)) {
nasm_error(ERR_NONFATAL, "non-constant value given to `%%rep'");
return DIRECTIVE_FOUND;
}
count = reloc_value(evalresult);
if (count >= REP_LIMIT) {
nasm_error(ERR_NONFATAL, "`%%rep' value exceeds limit");
count = 0;
} else
count++;
} else {
nasm_error(ERR_NONFATAL, "`%%rep' expects a repeat count");
count = 0;
}
free_tlist(origline);
tmp_defining = defining;
defining = nasm_malloc(sizeof(MMacro));
defining->prev = NULL;
defining->name = NULL; /* flags this macro as a %rep block */
defining->casesense = false;
defining->plus = false;
defining->nolist = nolist;
defining->in_progress = count;
defining->max_depth = 0;
defining->nparam_min = defining->nparam_max = 0;
defining->defaults = NULL;
defining->dlist = NULL;
defining->expansion = NULL;
defining->next_active = istk->mstk;
defining->rep_nest = tmp_defining;
return DIRECTIVE_FOUND;
case PP_ENDREP:
if (!defining || defining->name) {
nasm_error(ERR_NONFATAL, "`%%endrep': no matching `%%rep'");
return DIRECTIVE_FOUND;
}
/*
* Now we have a "macro" defined - although it has no name
* and we won't be entering it in the hash tables - we must
* push a macro-end marker for it on to istk->expansion.
* After that, it will take care of propagating itself (a
* macro-end marker line for a macro which is really a %rep
* block will cause the macro to be re-expanded, complete
* with another macro-end marker to ensure the process
* continues) until the whole expansion is forcibly removed
* from istk->expansion by a %exitrep.
*/
l = nasm_malloc(sizeof(Line));
l->next = istk->expansion;
l->finishes = defining;
l->first = NULL;
istk->expansion = l;
istk->mstk = defining;
lfmt->uplevel(defining->nolist ? LIST_MACRO_NOLIST : LIST_MACRO);
tmp_defining = defining;
defining = defining->rep_nest;
free_tlist(origline);
return DIRECTIVE_FOUND;
case PP_EXITREP:
/*
* We must search along istk->expansion until we hit a
* macro-end marker for a macro with no name. Then we set
* its `in_progress' flag to 0.
*/
list_for_each(l, istk->expansion)
if (l->finishes && !l->finishes->name)
break;
if (l)
l->finishes->in_progress = 1;
else
nasm_error(ERR_NONFATAL, "`%%exitrep' not within `%%rep' block");
free_tlist(origline);
return DIRECTIVE_FOUND;
case PP_XDEFINE:
case PP_IXDEFINE:
case PP_DEFINE:
case PP_IDEFINE:
casesense = (i == PP_DEFINE || i == PP_XDEFINE);
tline = tline->next;
skip_white_(tline);
tline = expand_id(tline);
if (!tline || (tline->type != TOK_ID &&
(tline->type != TOK_PREPROC_ID ||
tline->text[1] != '$'))) {
nasm_error(ERR_NONFATAL, "`%s' expects a macro identifier",
pp_directives[i]);
free_tlist(origline);
return DIRECTIVE_FOUND;
}
ctx = get_ctx(tline->text, &mname);
last = tline;
param_start = tline = tline->next;
nparam = 0;
/* Expand the macro definition now for %xdefine and %ixdefine */
if ((i == PP_XDEFINE) || (i == PP_IXDEFINE))
tline = expand_smacro(tline);
if (tok_is_(tline, "(")) {
/*
* This macro has parameters.
*/
tline = tline->next;
while (1) {
skip_white_(tline);
if (!tline) {
nasm_error(ERR_NONFATAL, "parameter identifier expected");
free_tlist(origline);
return DIRECTIVE_FOUND;
}
if (tline->type != TOK_ID) {
nasm_error(ERR_NONFATAL,
"`%s': parameter identifier expected",
tline->text);
free_tlist(origline);
return DIRECTIVE_FOUND;
}
tline->type = TOK_SMAC_PARAM + nparam++;
tline = tline->next;
skip_white_(tline);
if (tok_is_(tline, ",")) {
tline = tline->next;
} else {
if (!tok_is_(tline, ")")) {
nasm_error(ERR_NONFATAL,
"`)' expected to terminate macro template");
free_tlist(origline);
return DIRECTIVE_FOUND;
}
break;
}
}
last = tline;
tline = tline->next;
}
if (tok_type_(tline, TOK_WHITESPACE))
last = tline, tline = tline->next;
macro_start = NULL;
last->next = NULL;
t = tline;
while (t) {
if (t->type == TOK_ID) {
list_for_each(tt, param_start)
if (tt->type >= TOK_SMAC_PARAM &&
!strcmp(tt->text, t->text))
t->type = tt->type;
}
tt = t->next;
t->next = macro_start;
macro_start = t;
t = tt;
}
/*
* Good. We now have a macro name, a parameter count, and a
* token list (in reverse order) for an expansion. We ought
* to be OK just to create an SMacro, store it, and let
* free_tlist have the rest of the line (which we have
* carefully re-terminated after chopping off the expansion
* from the end).
*/
define_smacro(ctx, mname, casesense, nparam, macro_start);
free_tlist(origline);
return DIRECTIVE_FOUND;
case PP_UNDEF:
tline = tline->next;
skip_white_(tline);
tline = expand_id(tline);
if (!tline || (tline->type != TOK_ID &&
(tline->type != TOK_PREPROC_ID ||
tline->text[1] != '$'))) {
nasm_error(ERR_NONFATAL, "`%%undef' expects a macro identifier");
free_tlist(origline);
return DIRECTIVE_FOUND;
}
if (tline->next) {
nasm_error(ERR_WARNING|ERR_PASS1,
"trailing garbage after macro name ignored");
}
/* Find the context that symbol belongs to */
ctx = get_ctx(tline->text, &mname);
undef_smacro(ctx, mname);
free_tlist(origline);
return DIRECTIVE_FOUND;
case PP_DEFSTR:
case PP_IDEFSTR:
casesense = (i == PP_DEFSTR);
tline = tline->next;
skip_white_(tline);
tline = expand_id(tline);
if (!tline || (tline->type != TOK_ID &&
(tline->type != TOK_PREPROC_ID ||
tline->text[1] != '$'))) {
nasm_error(ERR_NONFATAL, "`%s' expects a macro identifier",
pp_directives[i]);
free_tlist(origline);
return DIRECTIVE_FOUND;
}
ctx = get_ctx(tline->text, &mname);
last = tline;
tline = expand_smacro(tline->next);
last->next = NULL;
while (tok_type_(tline, TOK_WHITESPACE))
tline = delete_Token(tline);
p = detoken(tline, false);
macro_start = nasm_malloc(sizeof(*macro_start));
macro_start->next = NULL;
macro_start->text = nasm_quote(p, strlen(p));
macro_start->type = TOK_STRING;
macro_start->a.mac = NULL;
nasm_free(p);
/*
* We now have a macro name, an implicit parameter count of
* zero, and a string token to use as an expansion. Create
* and store an SMacro.
*/
define_smacro(ctx, mname, casesense, 0, macro_start);
free_tlist(origline);
return DIRECTIVE_FOUND;
case PP_DEFTOK:
case PP_IDEFTOK:
casesense = (i == PP_DEFTOK);
tline = tline->next;
skip_white_(tline);
tline = expand_id(tline);
if (!tline || (tline->type != TOK_ID &&
(tline->type != TOK_PREPROC_ID ||
tline->text[1] != '$'))) {
nasm_error(ERR_NONFATAL,
"`%s' expects a macro identifier as first parameter",
pp_directives[i]);
free_tlist(origline);
return DIRECTIVE_FOUND;
}
ctx = get_ctx(tline->text, &mname);
last = tline;
tline = expand_smacro(tline->next);
last->next = NULL;
t = tline;
while (tok_type_(t, TOK_WHITESPACE))
t = t->next;
/* t should now point to the string */
if (!tok_type_(t, TOK_STRING)) {
nasm_error(ERR_NONFATAL,
"`%s` requires string as second parameter",
pp_directives[i]);
free_tlist(tline);
free_tlist(origline);
return DIRECTIVE_FOUND;
}
/*
* Convert the string to a token stream. Note that smacros
* are stored with the token stream reversed, so we have to
* reverse the output of tokenize().
*/
nasm_unquote_cstr(t->text, i);
macro_start = reverse_tokens(tokenize(t->text));
/*
* We now have a macro name, an implicit parameter count of
* zero, and a numeric token to use as an expansion. Create
* and store an SMacro.
*/
define_smacro(ctx, mname, casesense, 0, macro_start);
free_tlist(tline);
free_tlist(origline);
return DIRECTIVE_FOUND;
case PP_PATHSEARCH:
{
const char *found_path;
casesense = true;
tline = tline->next;
skip_white_(tline);
tline = expand_id(tline);
if (!tline || (tline->type != TOK_ID &&
(tline->type != TOK_PREPROC_ID ||
tline->text[1] != '$'))) {
nasm_error(ERR_NONFATAL,
"`%%pathsearch' expects a macro identifier as first parameter");
free_tlist(origline);
return DIRECTIVE_FOUND;
}
ctx = get_ctx(tline->text, &mname);
last = tline;
tline = expand_smacro(tline->next);
last->next = NULL;
t = tline;
while (tok_type_(t, TOK_WHITESPACE))
t = t->next;
if (!t || (t->type != TOK_STRING &&
t->type != TOK_INTERNAL_STRING)) {
nasm_error(ERR_NONFATAL, "`%%pathsearch' expects a file name");
free_tlist(tline);
free_tlist(origline);
return DIRECTIVE_FOUND; /* but we did _something_ */
}
if (t->next)
nasm_error(ERR_WARNING|ERR_PASS1,
"trailing garbage after `%%pathsearch' ignored");
p = t->text;
if (t->type != TOK_INTERNAL_STRING)
nasm_unquote(p, NULL);
inc_fopen(p, NULL, &found_path, INC_PROBE, NF_BINARY);
if (!found_path)
found_path = p;
macro_start = nasm_malloc(sizeof(*macro_start));
macro_start->next = NULL;
macro_start->text = nasm_quote(found_path, strlen(found_path));
macro_start->type = TOK_STRING;
macro_start->a.mac = NULL;
/*
* We now have a macro name, an implicit parameter count of
* zero, and a string token to use as an expansion. Create
* and store an SMacro.
*/
define_smacro(ctx, mname, casesense, 0, macro_start);
free_tlist(tline);
free_tlist(origline);
return DIRECTIVE_FOUND;
}
case PP_STRLEN:
casesense = true;
tline = tline->next;
skip_white_(tline);
tline = expand_id(tline);
if (!tline || (tline->type != TOK_ID &&
(tline->type != TOK_PREPROC_ID ||
tline->text[1] != '$'))) {
nasm_error(ERR_NONFATAL,
"`%%strlen' expects a macro identifier as first parameter");
free_tlist(origline);
return DIRECTIVE_FOUND;
}
ctx = get_ctx(tline->text, &mname);
last = tline;
tline = expand_smacro(tline->next);
last->next = NULL;
t = tline;
while (tok_type_(t, TOK_WHITESPACE))
t = t->next;
/* t should now point to the string */
if (!tok_type_(t, TOK_STRING)) {
nasm_error(ERR_NONFATAL,
"`%%strlen` requires string as second parameter");
free_tlist(tline);
free_tlist(origline);
return DIRECTIVE_FOUND;
}
macro_start = nasm_malloc(sizeof(*macro_start));
macro_start->next = NULL;
make_tok_num(macro_start, nasm_unquote(t->text, NULL));
macro_start->a.mac = NULL;
/*
* We now have a macro name, an implicit parameter count of
* zero, and a numeric token to use as an expansion. Create
* and store an SMacro.
*/
define_smacro(ctx, mname, casesense, 0, macro_start);
free_tlist(tline);
free_tlist(origline);
return DIRECTIVE_FOUND;
case PP_STRCAT:
casesense = true;
tline = tline->next;
skip_white_(tline);
tline = expand_id(tline);
if (!tline || (tline->type != TOK_ID &&
(tline->type != TOK_PREPROC_ID ||
tline->text[1] != '$'))) {
nasm_error(ERR_NONFATAL,
"`%%strcat' expects a macro identifier as first parameter");
free_tlist(origline);
return DIRECTIVE_FOUND;
}
ctx = get_ctx(tline->text, &mname);
last = tline;
tline = expand_smacro(tline->next);
last->next = NULL;
len = 0;
list_for_each(t, tline) {
switch (t->type) {
case TOK_WHITESPACE:
break;
case TOK_STRING:
len += t->a.len = nasm_unquote(t->text, NULL);
break;
case TOK_OTHER:
if (!strcmp(t->text, ",")) /* permit comma separators */
break;
/* else fall through */
default:
nasm_error(ERR_NONFATAL,
"non-string passed to `%%strcat' (%d)", t->type);
free_tlist(tline);
free_tlist(origline);
return DIRECTIVE_FOUND;
}
}
p = pp = nasm_malloc(len);
list_for_each(t, tline) {
if (t->type == TOK_STRING) {
memcpy(p, t->text, t->a.len);
p += t->a.len;
}
}
/*
* We now have a macro name, an implicit parameter count of
* zero, and a numeric token to use as an expansion. Create
* and store an SMacro.
*/
macro_start = new_Token(NULL, TOK_STRING, NULL, 0);
macro_start->text = nasm_quote(pp, len);
nasm_free(pp);
define_smacro(ctx, mname, casesense, 0, macro_start);
free_tlist(tline);
free_tlist(origline);
return DIRECTIVE_FOUND;
case PP_SUBSTR:
{
int64_t start, count;
size_t len;
casesense = true;
tline = tline->next;
skip_white_(tline);
tline = expand_id(tline);
if (!tline || (tline->type != TOK_ID &&
(tline->type != TOK_PREPROC_ID ||
tline->text[1] != '$'))) {
nasm_error(ERR_NONFATAL,
"`%%substr' expects a macro identifier as first parameter");
free_tlist(origline);
return DIRECTIVE_FOUND;
}
ctx = get_ctx(tline->text, &mname);
last = tline;
tline = expand_smacro(tline->next);
last->next = NULL;
if (tline) /* skip expanded id */
t = tline->next;
while (tok_type_(t, TOK_WHITESPACE))
t = t->next;
/* t should now point to the string */
if (!tok_type_(t, TOK_STRING)) {
nasm_error(ERR_NONFATAL,
"`%%substr` requires string as second parameter");
free_tlist(tline);
free_tlist(origline);
return DIRECTIVE_FOUND;
}
tt = t->next;
tptr = &tt;
tokval.t_type = TOKEN_INVALID;
evalresult = evaluate(ppscan, tptr, &tokval, NULL, pass, NULL);
if (!evalresult) {
free_tlist(tline);
free_tlist(origline);
return DIRECTIVE_FOUND;
} else if (!is_simple(evalresult)) {
nasm_error(ERR_NONFATAL, "non-constant value given to `%%substr`");
free_tlist(tline);
free_tlist(origline);
return DIRECTIVE_FOUND;
}
start = evalresult->value - 1;
while (tok_type_(tt, TOK_WHITESPACE))
tt = tt->next;
if (!tt) {
count = 1; /* Backwards compatibility: one character */
} else {
tokval.t_type = TOKEN_INVALID;
evalresult = evaluate(ppscan, tptr, &tokval, NULL, pass, NULL);
if (!evalresult) {
free_tlist(tline);
free_tlist(origline);
return DIRECTIVE_FOUND;
} else if (!is_simple(evalresult)) {
nasm_error(ERR_NONFATAL, "non-constant value given to `%%substr`");
free_tlist(tline);
free_tlist(origline);
return DIRECTIVE_FOUND;
}
count = evalresult->value;
}
len = nasm_unquote(t->text, NULL);
/* make start and count being in range */
if (start < 0)
start = 0;
if (count < 0)
count = len + count + 1 - start;
if (start + count > (int64_t)len)
count = len - start;
if (!len || count < 0 || start >=(int64_t)len)
start = -1, count = 0; /* empty string */
macro_start = nasm_malloc(sizeof(*macro_start));
macro_start->next = NULL;
macro_start->text = nasm_quote((start < 0) ? "" : t->text + start, count);
macro_start->type = TOK_STRING;
macro_start->a.mac = NULL;
/*
* We now have a macro name, an implicit parameter count of
* zero, and a numeric token to use as an expansion. Create
* and store an SMacro.
*/
define_smacro(ctx, mname, casesense, 0, macro_start);
free_tlist(tline);
free_tlist(origline);
return DIRECTIVE_FOUND;
}
case PP_ASSIGN:
case PP_IASSIGN:
casesense = (i == PP_ASSIGN);
tline = tline->next;
skip_white_(tline);
tline = expand_id(tline);
if (!tline || (tline->type != TOK_ID &&
(tline->type != TOK_PREPROC_ID ||
tline->text[1] != '$'))) {
nasm_error(ERR_NONFATAL,
"`%%%sassign' expects a macro identifier",
(i == PP_IASSIGN ? "i" : ""));
free_tlist(origline);
return DIRECTIVE_FOUND;
}
ctx = get_ctx(tline->text, &mname);
last = tline;
tline = expand_smacro(tline->next);
last->next = NULL;
t = tline;
tptr = &t;
tokval.t_type = TOKEN_INVALID;
evalresult = evaluate(ppscan, tptr, &tokval, NULL, pass, NULL);
free_tlist(tline);
if (!evalresult) {
free_tlist(origline);
return DIRECTIVE_FOUND;
}
if (tokval.t_type)
nasm_error(ERR_WARNING|ERR_PASS1,
"trailing garbage after expression ignored");
if (!is_simple(evalresult)) {
nasm_error(ERR_NONFATAL,
"non-constant value given to `%%%sassign'",
(i == PP_IASSIGN ? "i" : ""));
free_tlist(origline);
return DIRECTIVE_FOUND;
}
macro_start = nasm_malloc(sizeof(*macro_start));
macro_start->next = NULL;
make_tok_num(macro_start, reloc_value(evalresult));
macro_start->a.mac = NULL;
/*
* We now have a macro name, an implicit parameter count of
* zero, and a numeric token to use as an expansion. Create
* and store an SMacro.
*/
define_smacro(ctx, mname, casesense, 0, macro_start);
free_tlist(origline);
return DIRECTIVE_FOUND;
case PP_LINE:
/*
* Syntax is `%line nnn[+mmm] [filename]'
*/
tline = tline->next;
skip_white_(tline);
if (!tok_type_(tline, TOK_NUMBER)) {
nasm_error(ERR_NONFATAL, "`%%line' expects line number");
free_tlist(origline);
return DIRECTIVE_FOUND;
}
k = readnum(tline->text, &err);
m = 1;
tline = tline->next;
if (tok_is_(tline, "+")) {
tline = tline->next;
if (!tok_type_(tline, TOK_NUMBER)) {
nasm_error(ERR_NONFATAL, "`%%line' expects line increment");
free_tlist(origline);
return DIRECTIVE_FOUND;
}
m = readnum(tline->text, &err);
tline = tline->next;
}
skip_white_(tline);
src_set_linnum(k);
istk->lineinc = m;
if (tline) {
char *fname = detoken(tline, false);
src_set_fname(fname);
nasm_free(fname);
}
free_tlist(origline);
return DIRECTIVE_FOUND;
default:
nasm_error(ERR_FATAL,
"preprocessor directive `%s' not yet implemented",
pp_directives[i]);
return DIRECTIVE_FOUND;
}
}
/*
* Ensure that a macro parameter contains a condition code and
* nothing else. Return the condition code index if so, or -1
* otherwise.
*/
static int find_cc(Token * t)
{
Token *tt;
if (!t)
return -1; /* Probably a %+ without a space */
skip_white_(t);
if (t->type != TOK_ID)
return -1;
tt = t->next;
skip_white_(tt);
if (tt && (tt->type != TOK_OTHER || strcmp(tt->text, ",")))
return -1;
return bsii(t->text, (const char **)conditions, ARRAY_SIZE(conditions));
}
/*
* This routines walks over tokens strem and hadnles tokens
* pasting, if @handle_explicit passed then explicit pasting
* term is handled, otherwise -- implicit pastings only.
*/
static bool paste_tokens(Token **head, const struct tokseq_match *m,
size_t mnum, bool handle_explicit)
{
Token *tok, *next, **prev_next, **prev_nonspace;
bool pasted = false;
char *buf, *p;
size_t len, i;
/*
* The last token before pasting. We need it
* to be able to connect new handled tokens.
* In other words if there were a tokens stream
*
* A -> B -> C -> D
*
* and we've joined tokens B and C, the resulting
* stream should be
*
* A -> BC -> D
*/
tok = *head;
prev_next = NULL;
if (!tok_type_(tok, TOK_WHITESPACE) && !tok_type_(tok, TOK_PASTE))
prev_nonspace = head;
else
prev_nonspace = NULL;
while (tok && (next = tok->next)) {
switch (tok->type) {
case TOK_WHITESPACE:
/* Zap redundant whitespaces */
while (tok_type_(next, TOK_WHITESPACE))
next = delete_Token(next);
tok->next = next;
break;
case TOK_PASTE:
/* Explicit pasting */
if (!handle_explicit)
break;
next = delete_Token(tok);
while (tok_type_(next, TOK_WHITESPACE))
next = delete_Token(next);
if (!pasted)
pasted = true;
/* Left pasting token is start of line */
if (!prev_nonspace)
nasm_error(ERR_FATAL, "No lvalue found on pasting");
/*
* No ending token, this might happen in two
* cases
*
* 1) There indeed no right token at all
* 2) There is a bare "%define ID" statement,
* and @ID does expand to whitespace.
*
* So technically we need to do a grammar analysis
* in another stage of parsing, but for now lets don't
* change the behaviour people used to. Simply allow
* whitespace after paste token.
*/
if (!next) {
/*
* Zap ending space tokens and that's all.
*/
tok = (*prev_nonspace)->next;
while (tok_type_(tok, TOK_WHITESPACE))
tok = delete_Token(tok);
tok = *prev_nonspace;
tok->next = NULL;
break;
}
tok = *prev_nonspace;
while (tok_type_(tok, TOK_WHITESPACE))
tok = delete_Token(tok);
len = strlen(tok->text);
len += strlen(next->text);
p = buf = nasm_malloc(len + 1);
strcpy(p, tok->text);
p = strchr(p, '\0');
strcpy(p, next->text);
delete_Token(tok);
tok = tokenize(buf);
nasm_free(buf);
*prev_nonspace = tok;
while (tok && tok->next)
tok = tok->next;
tok->next = delete_Token(next);
/* Restart from pasted tokens head */
tok = *prev_nonspace;
break;
default:
/* implicit pasting */
for (i = 0; i < mnum; i++) {
if (!(PP_CONCAT_MATCH(tok, m[i].mask_head)))
continue;
len = 0;
while (next && PP_CONCAT_MATCH(next, m[i].mask_tail)) {
len += strlen(next->text);
next = next->next;
}
/* No match */
if (tok == next)
break;
len += strlen(tok->text);
p = buf = nasm_malloc(len + 1);
while (tok != next) {
strcpy(p, tok->text);
p = strchr(p, '\0');
tok = delete_Token(tok);
}
tok = tokenize(buf);
nasm_free(buf);
if (prev_next)
*prev_next = tok;
else
*head = tok;
/*
* Connect pasted into original stream,
* ie A -> new-tokens -> B
*/
while (tok && tok->next)
tok = tok->next;
tok->next = next;
if (!pasted)
pasted = true;
/* Restart from pasted tokens head */
tok = prev_next ? *prev_next : *head;
}
break;
}
prev_next = &tok->next;
if (tok->next &&
!tok_type_(tok->next, TOK_WHITESPACE) &&
!tok_type_(tok->next, TOK_PASTE))
prev_nonspace = prev_next;
tok = tok->next;
}
return pasted;
}
/*
* expands to a list of tokens from %{x:y}
*/
static Token *expand_mmac_params_range(MMacro *mac, Token *tline, Token ***last)
{
Token *t = tline, **tt, *tm, *head;
char *pos;
int fst, lst, j, i;
pos = strchr(tline->text, ':');
nasm_assert(pos);
lst = atoi(pos + 1);
fst = atoi(tline->text + 1);
/*
* only macros params are accounted so
* if someone passes %0 -- we reject such
* value(s)
*/
if (lst == 0 || fst == 0)
goto err;
/* the values should be sane */
if ((fst > (int)mac->nparam || fst < (-(int)mac->nparam)) ||
(lst > (int)mac->nparam || lst < (-(int)mac->nparam)))
goto err;
fst = fst < 0 ? fst + (int)mac->nparam + 1: fst;
lst = lst < 0 ? lst + (int)mac->nparam + 1: lst;
/* counted from zero */
fst--, lst--;
/*
* It will be at least one token. Note we
* need to scan params until separator, otherwise
* only first token will be passed.
*/
tm = mac->params[(fst + mac->rotate) % mac->nparam];
head = new_Token(NULL, tm->type, tm->text, 0);
tt = &head->next, tm = tm->next;
while (tok_isnt_(tm, ",")) {
t = new_Token(NULL, tm->type, tm->text, 0);
*tt = t, tt = &t->next, tm = tm->next;
}
if (fst < lst) {
for (i = fst + 1; i <= lst; i++) {
t = new_Token(NULL, TOK_OTHER, ",", 0);
*tt = t, tt = &t->next;
j = (i + mac->rotate) % mac->nparam;
tm = mac->params[j];
while (tok_isnt_(tm, ",")) {
t = new_Token(NULL, tm->type, tm->text, 0);
*tt = t, tt = &t->next, tm = tm->next;
}
}
} else {
for (i = fst - 1; i >= lst; i--) {
t = new_Token(NULL, TOK_OTHER, ",", 0);
*tt = t, tt = &t->next;
j = (i + mac->rotate) % mac->nparam;
tm = mac->params[j];
while (tok_isnt_(tm, ",")) {
t = new_Token(NULL, tm->type, tm->text, 0);
*tt = t, tt = &t->next, tm = tm->next;
}
}
}
*last = tt;
return head;
err:
nasm_error(ERR_NONFATAL, "`%%{%s}': macro parameters out of range",
&tline->text[1]);
return tline;
}
/*
* Expand MMacro-local things: parameter references (%0, %n, %+n,
* %-n) and MMacro-local identifiers (%%foo) as well as
* macro indirection (%[...]) and range (%{..:..}).
*/
static Token *expand_mmac_params(Token * tline)
{
Token *t, *tt, **tail, *thead;
bool changed = false;
char *pos;
tail = &thead;
thead = NULL;
while (tline) {
if (tline->type == TOK_PREPROC_ID &&
(((tline->text[1] == '+' || tline->text[1] == '-') && tline->text[2]) ||
(tline->text[1] >= '0' && tline->text[1] <= '9') ||
tline->text[1] == '%')) {
char *text = NULL;
int type = 0, cc; /* type = 0 to placate optimisers */
char tmpbuf[30];
unsigned int n;
int i;
MMacro *mac;
t = tline;
tline = tline->next;
mac = istk->mstk;
while (mac && !mac->name) /* avoid mistaking %reps for macros */
mac = mac->next_active;
if (!mac) {
nasm_error(ERR_NONFATAL, "`%s': not in a macro call", t->text);
} else {
pos = strchr(t->text, ':');
if (!pos) {
switch (t->text[1]) {
/*
* We have to make a substitution of one of the
* forms %1, %-1, %+1, %%foo, %0.
*/
case '0':
type = TOK_NUMBER;
snprintf(tmpbuf, sizeof(tmpbuf), "%d", mac->nparam);
text = nasm_strdup(tmpbuf);
break;
case '%':
type = TOK_ID;
snprintf(tmpbuf, sizeof(tmpbuf), "..@%"PRIu64".",
mac->unique);
text = nasm_strcat(tmpbuf, t->text + 2);
break;
case '-':
n = atoi(t->text + 2) - 1;
if (n >= mac->nparam)
tt = NULL;
else {
if (mac->nparam > 1)
n = (n + mac->rotate) % mac->nparam;
tt = mac->params[n];
}
cc = find_cc(tt);
if (cc == -1) {
nasm_error(ERR_NONFATAL,
"macro parameter %d is not a condition code",
n + 1);
text = NULL;
} else {
type = TOK_ID;
if (inverse_ccs[cc] == -1) {
nasm_error(ERR_NONFATAL,
"condition code `%s' is not invertible",
conditions[cc]);
text = NULL;
} else
text = nasm_strdup(conditions[inverse_ccs[cc]]);
}
break;
case '+':
n = atoi(t->text + 2) - 1;
if (n >= mac->nparam)
tt = NULL;
else {
if (mac->nparam > 1)
n = (n + mac->rotate) % mac->nparam;
tt = mac->params[n];
}
cc = find_cc(tt);
if (cc == -1) {
nasm_error(ERR_NONFATAL,
"macro parameter %d is not a condition code",
n + 1);
text = NULL;
} else {
type = TOK_ID;
text = nasm_strdup(conditions[cc]);
}
break;
default:
n = atoi(t->text + 1) - 1;
if (n >= mac->nparam)
tt = NULL;
else {
if (mac->nparam > 1)
n = (n + mac->rotate) % mac->nparam;
tt = mac->params[n];
}
if (tt) {
for (i = 0; i < mac->paramlen[n]; i++) {
*tail = new_Token(NULL, tt->type, tt->text, 0);
tail = &(*tail)->next;
tt = tt->next;
}
}
text = NULL; /* we've done it here */
break;
}
} else {
/*
* seems we have a parameters range here
*/
Token *head, **last;
head = expand_mmac_params_range(mac, t, &last);
if (head != t) {
*tail = head;
*last = tline;
tline = head;
text = NULL;
}
}
}
if (!text) {
delete_Token(t);
} else {
*tail = t;
tail = &t->next;
t->type = type;
nasm_free(t->text);
t->text = text;
t->a.mac = NULL;
}
changed = true;
continue;
} else if (tline->type == TOK_INDIRECT) {
t = tline;
tline = tline->next;
tt = tokenize(t->text);
tt = expand_mmac_params(tt);
tt = expand_smacro(tt);
*tail = tt;
while (tt) {
tt->a.mac = NULL; /* Necessary? */
tail = &tt->next;
tt = tt->next;
}
delete_Token(t);
changed = true;
} else {
t = *tail = tline;
tline = tline->next;
t->a.mac = NULL;
tail = &t->next;
}
}
*tail = NULL;
if (changed) {
const struct tokseq_match t[] = {
{
PP_CONCAT_MASK(TOK_ID) |
PP_CONCAT_MASK(TOK_FLOAT), /* head */
PP_CONCAT_MASK(TOK_ID) |
PP_CONCAT_MASK(TOK_NUMBER) |
PP_CONCAT_MASK(TOK_FLOAT) |
PP_CONCAT_MASK(TOK_OTHER) /* tail */
},
{
PP_CONCAT_MASK(TOK_NUMBER), /* head */
PP_CONCAT_MASK(TOK_NUMBER) /* tail */
}
};
paste_tokens(&thead, t, ARRAY_SIZE(t), false);
}
return thead;
}
/*
* Expand all single-line macro calls made in the given line.
* Return the expanded version of the line. The original is deemed
* to be destroyed in the process. (In reality we'll just move
* Tokens from input to output a lot of the time, rather than
* actually bothering to destroy and replicate.)
*/
static Token *expand_smacro(Token * tline)
{
Token *t, *tt, *mstart, **tail, *thead;
SMacro *head = NULL, *m;
Token **params;
int *paramsize;
unsigned int nparam, sparam;
int brackets;
Token *org_tline = tline;
Context *ctx;
const char *mname;
int deadman = DEADMAN_LIMIT;
bool expanded;
/*
* Trick: we should avoid changing the start token pointer since it can
* be contained in "next" field of other token. Because of this
* we allocate a copy of first token and work with it; at the end of
* routine we copy it back
*/
if (org_tline) {
tline = new_Token(org_tline->next, org_tline->type,
org_tline->text, 0);
tline->a.mac = org_tline->a.mac;
nasm_free(org_tline->text);
org_tline->text = NULL;
}
expanded = true; /* Always expand %+ at least once */
again:
thead = NULL;
tail = &thead;
while (tline) { /* main token loop */
if (!--deadman) {
nasm_error(ERR_NONFATAL, "interminable macro recursion");
goto err;
}
if ((mname = tline->text)) {
/* if this token is a local macro, look in local context */
if (tline->type == TOK_ID) {
head = (SMacro *)hash_findix(&smacros, mname);
} else if (tline->type == TOK_PREPROC_ID) {
ctx = get_ctx(mname, &mname);
head = ctx ? (SMacro *)hash_findix(&ctx->localmac, mname) : NULL;
} else
head = NULL;
/*
* We've hit an identifier. As in is_mmacro below, we first
* check whether the identifier is a single-line macro at
* all, then think about checking for parameters if
* necessary.
*/
list_for_each(m, head)
if (!mstrcmp(m->name, mname, m->casesense))
break;
if (m) {
mstart = tline;
params = NULL;
paramsize = NULL;
if (m->nparam == 0) {
/*
* Simple case: the macro is parameterless. Discard the
* one token that the macro call took, and push the
* expansion back on the to-do stack.
*/
if (!m->expansion) {
if (!strcmp("__FILE__", m->name)) {
const char *file = src_get_fname();
/* nasm_free(tline->text); here? */
tline->text = nasm_quote(file, strlen(file));
tline->type = TOK_STRING;
continue;
}
if (!strcmp("__LINE__", m->name)) {
nasm_free(tline->text);
make_tok_num(tline, src_get_linnum());
continue;
}
if (!strcmp("__BITS__", m->name)) {
nasm_free(tline->text);
make_tok_num(tline, globalbits);
continue;
}
tline = delete_Token(tline);
continue;
}
} else {
/*
* Complicated case: at least one macro with this name
* exists and takes parameters. We must find the
* parameters in the call, count them, find the SMacro
* that corresponds to that form of the macro call, and
* substitute for the parameters when we expand. What a
* pain.
*/
/*tline = tline->next;
skip_white_(tline); */
do {
t = tline->next;
while (tok_type_(t, TOK_SMAC_END)) {
t->a.mac->in_progress = false;
t->text = NULL;
t = tline->next = delete_Token(t);
}
tline = t;
} while (tok_type_(tline, TOK_WHITESPACE));
if (!tok_is_(tline, "(")) {
/*
* This macro wasn't called with parameters: ignore
* the call. (Behaviour borrowed from gnu cpp.)
*/
tline = mstart;
m = NULL;
} else {
int paren = 0;
int white = 0;
brackets = 0;
nparam = 0;
sparam = PARAM_DELTA;
params = nasm_malloc(sparam * sizeof(Token *));
params[0] = tline->next;
paramsize = nasm_malloc(sparam * sizeof(int));
paramsize[0] = 0;
while (true) { /* parameter loop */
/*
* For some unusual expansions
* which concatenates function call
*/
t = tline->next;
while (tok_type_(t, TOK_SMAC_END)) {
t->a.mac->in_progress = false;
t->text = NULL;
t = tline->next = delete_Token(t);
}
tline = t;
if (!tline) {
nasm_error(ERR_NONFATAL,
"macro call expects terminating `)'");
break;
}
if (tline->type == TOK_WHITESPACE
&& brackets <= 0) {
if (paramsize[nparam])
white++;
else
params[nparam] = tline->next;
continue; /* parameter loop */
}
if (tline->type == TOK_OTHER
&& tline->text[1] == 0) {
char ch = tline->text[0];
if (ch == ',' && !paren && brackets <= 0) {
if (++nparam >= sparam) {
sparam += PARAM_DELTA;
params = nasm_realloc(params,
sparam * sizeof(Token *));
paramsize = nasm_realloc(paramsize,
sparam * sizeof(int));
}
params[nparam] = tline->next;
paramsize[nparam] = 0;
white = 0;
continue; /* parameter loop */
}
if (ch == '{' &&
(brackets > 0 || (brackets == 0 &&
!paramsize[nparam])))
{
if (!(brackets++)) {
params[nparam] = tline->next;
continue; /* parameter loop */
}
}
if (ch == '}' && brackets > 0)
if (--brackets == 0) {
brackets = -1;
continue; /* parameter loop */
}
if (ch == '(' && !brackets)
paren++;
if (ch == ')' && brackets <= 0)
if (--paren < 0)
break;
}
if (brackets < 0) {
brackets = 0;
nasm_error(ERR_NONFATAL, "braces do not "
"enclose all of macro parameter");
}
paramsize[nparam] += white + 1;
white = 0;
} /* parameter loop */
nparam++;
while (m && (m->nparam != nparam ||
mstrcmp(m->name, mname,
m->casesense)))
m = m->next;
if (!m)
nasm_error(ERR_WARNING|ERR_PASS1|ERR_WARN_MNP,
"macro `%s' exists, "
"but not taking %d parameters",
mstart->text, nparam);
}
}
if (m && m->in_progress)
m = NULL;
if (!m) { /* in progess or didn't find '(' or wrong nparam */
/*
* Design question: should we handle !tline, which
* indicates missing ')' here, or expand those
* macros anyway, which requires the (t) test a few
* lines down?
*/
nasm_free(params);
nasm_free(paramsize);
tline = mstart;
} else {
/*
* Expand the macro: we are placed on the last token of the
* call, so that we can easily split the call from the
* following tokens. We also start by pushing an SMAC_END
* token for the cycle removal.
*/
t = tline;
if (t) {
tline = t->next;
t->next = NULL;
}
tt = new_Token(tline, TOK_SMAC_END, NULL, 0);
tt->a.mac = m;
m->in_progress = true;
tline = tt;
list_for_each(t, m->expansion) {
if (t->type >= TOK_SMAC_PARAM) {
Token *pcopy = tline, **ptail = &pcopy;
Token *ttt, *pt;
int i;
ttt = params[t->type - TOK_SMAC_PARAM];
i = paramsize[t->type - TOK_SMAC_PARAM];
while (--i >= 0) {
pt = *ptail = new_Token(tline, ttt->type,
ttt->text, 0);
ptail = &pt->next;
ttt = ttt->next;
}
tline = pcopy;
} else if (t->type == TOK_PREPROC_Q) {
tt = new_Token(tline, TOK_ID, mname, 0);
tline = tt;
} else if (t->type == TOK_PREPROC_QQ) {
tt = new_Token(tline, TOK_ID, m->name, 0);
tline = tt;
} else {
tt = new_Token(tline, t->type, t->text, 0);
tline = tt;
}
}
/*
* Having done that, get rid of the macro call, and clean
* up the parameters.
*/
nasm_free(params);
nasm_free(paramsize);
free_tlist(mstart);
expanded = true;
continue; /* main token loop */
}
}
}
if (tline->type == TOK_SMAC_END) {
tline->a.mac->in_progress = false;
tline = delete_Token(tline);
} else {
t = *tail = tline;
tline = tline->next;
t->a.mac = NULL;
t->next = NULL;
tail = &t->next;
}
}
/*
* Now scan the entire line and look for successive TOK_IDs that resulted
* after expansion (they can't be produced by tokenize()). The successive
* TOK_IDs should be concatenated.
* Also we look for %+ tokens and concatenate the tokens before and after
* them (without white spaces in between).
*/
if (expanded) {
const struct tokseq_match t[] = {
{
PP_CONCAT_MASK(TOK_ID) |
PP_CONCAT_MASK(TOK_PREPROC_ID), /* head */
PP_CONCAT_MASK(TOK_ID) |
PP_CONCAT_MASK(TOK_PREPROC_ID) |
PP_CONCAT_MASK(TOK_NUMBER) /* tail */
}
};
if (paste_tokens(&thead, t, ARRAY_SIZE(t), true)) {
/*
* If we concatenated something, *and* we had previously expanded
* an actual macro, scan the lines again for macros...
*/
tline = thead;
expanded = false;
goto again;
}
}
err:
if (org_tline) {
if (thead) {
*org_tline = *thead;
/* since we just gave text to org_line, don't free it */
thead->text = NULL;
delete_Token(thead);
} else {
/* the expression expanded to empty line;
we can't return NULL for some reasons
we just set the line to a single WHITESPACE token. */
memset(org_tline, 0, sizeof(*org_tline));
org_tline->text = NULL;
org_tline->type = TOK_WHITESPACE;
}
thead = org_tline;
}
return thead;
}
/*
* Similar to expand_smacro but used exclusively with macro identifiers
* right before they are fetched in. The reason is that there can be
* identifiers consisting of several subparts. We consider that if there
* are more than one element forming the name, user wants a expansion,
* otherwise it will be left as-is. Example:
*
* %define %$abc cde
*
* the identifier %$abc will be left as-is so that the handler for %define
* will suck it and define the corresponding value. Other case:
*
* %define _%$abc cde
*
* In this case user wants name to be expanded *before* %define starts
* working, so we'll expand %$abc into something (if it has a value;
* otherwise it will be left as-is) then concatenate all successive
* PP_IDs into one.
*/
static Token *expand_id(Token * tline)
{
Token *cur, *oldnext = NULL;
if (!tline || !tline->next)
return tline;
cur = tline;
while (cur->next &&
(cur->next->type == TOK_ID ||
cur->next->type == TOK_PREPROC_ID
|| cur->next->type == TOK_NUMBER))
cur = cur->next;
/* If identifier consists of just one token, don't expand */
if (cur == tline)
return tline;
if (cur) {
oldnext = cur->next; /* Detach the tail past identifier */
cur->next = NULL; /* so that expand_smacro stops here */
}
tline = expand_smacro(tline);
if (cur) {
/* expand_smacro possibly changhed tline; re-scan for EOL */
cur = tline;
while (cur && cur->next)
cur = cur->next;
if (cur)
cur->next = oldnext;
}
return tline;
}
/*
* Determine whether the given line constitutes a multi-line macro
* call, and return the MMacro structure called if so. Doesn't have
* to check for an initial label - that's taken care of in
* expand_mmacro - but must check numbers of parameters. Guaranteed
* to be called with tline->type == TOK_ID, so the putative macro
* name is easy to find.
*/
static MMacro *is_mmacro(Token * tline, Token *** params_array)
{
MMacro *head, *m;
Token **params;
int nparam;
head = (MMacro *) hash_findix(&mmacros, tline->text);
/*
* Efficiency: first we see if any macro exists with the given
* name. If not, we can return NULL immediately. _Then_ we
* count the parameters, and then we look further along the
* list if necessary to find the proper MMacro.
*/
list_for_each(m, head)
if (!mstrcmp(m->name, tline->text, m->casesense))
break;
if (!m)
return NULL;
/*
* OK, we have a potential macro. Count and demarcate the
* parameters.
*/
count_mmac_params(tline->next, &nparam, &params);
/*
* So we know how many parameters we've got. Find the MMacro
* structure that handles this number.
*/
while (m) {
if (m->nparam_min <= nparam
&& (m->plus || nparam <= m->nparam_max)) {
/*
* This one is right. Just check if cycle removal
* prohibits us using it before we actually celebrate...
*/
if (m->in_progress > m->max_depth) {
if (m->max_depth > 0) {
nasm_error(ERR_WARNING,
"reached maximum recursion depth of %i",
m->max_depth);
}
nasm_free(params);
return NULL;
}
/*
* It's right, and we can use it. Add its default
* parameters to the end of our list if necessary.
*/
if (m->defaults && nparam < m->nparam_min + m->ndefs) {
params =
nasm_realloc(params,
((m->nparam_min + m->ndefs +
1) * sizeof(*params)));
while (nparam < m->nparam_min + m->ndefs) {
params[nparam] = m->defaults[nparam - m->nparam_min];
nparam++;
}
}
/*
* If we've gone over the maximum parameter count (and
* we're in Plus mode), ignore parameters beyond
* nparam_max.
*/
if (m->plus && nparam > m->nparam_max)
nparam = m->nparam_max;
/*
* Then terminate the parameter list, and leave.
*/
if (!params) { /* need this special case */
params = nasm_malloc(sizeof(*params));
nparam = 0;
}
params[nparam] = NULL;
*params_array = params;
return m;
}
/*
* This one wasn't right: look for the next one with the
* same name.
*/
list_for_each(m, m->next)
if (!mstrcmp(m->name, tline->text, m->casesense))
break;
}
/*
* After all that, we didn't find one with the right number of
* parameters. Issue a warning, and fail to expand the macro.
*/
nasm_error(ERR_WARNING|ERR_PASS1|ERR_WARN_MNP,
"macro `%s' exists, but not taking %d parameters",
tline->text, nparam);
nasm_free(params);
return NULL;
}
/*
* Save MMacro invocation specific fields in
* preparation for a recursive macro expansion
*/
static void push_mmacro(MMacro *m)
{
MMacroInvocation *i;
i = nasm_malloc(sizeof(MMacroInvocation));
i->prev = m->prev;
i->params = m->params;
i->iline = m->iline;
i->nparam = m->nparam;
i->rotate = m->rotate;
i->paramlen = m->paramlen;
i->unique = m->unique;
i->condcnt = m->condcnt;
m->prev = i;
}
/*
* Restore MMacro invocation specific fields that were
* saved during a previous recursive macro expansion
*/
static void pop_mmacro(MMacro *m)
{
MMacroInvocation *i;
if (m->prev) {
i = m->prev;
m->prev = i->prev;
m->params = i->params;
m->iline = i->iline;
m->nparam = i->nparam;
m->rotate = i->rotate;
m->paramlen = i->paramlen;
m->unique = i->unique;
m->condcnt = i->condcnt;
nasm_free(i);
}
}
/*
* Expand the multi-line macro call made by the given line, if
* there is one to be expanded. If there is, push the expansion on
* istk->expansion and return 1. Otherwise return 0.
*/
static int expand_mmacro(Token * tline)
{
Token *startline = tline;
Token *label = NULL;
int dont_prepend = 0;
Token **params, *t, *tt;
MMacro *m;
Line *l, *ll;
int i, nparam, *paramlen;
const char *mname;
t = tline;
skip_white_(t);
/* if (!tok_type_(t, TOK_ID)) Lino 02/25/02 */
if (!tok_type_(t, TOK_ID) && !tok_type_(t, TOK_PREPROC_ID))
return 0;
m = is_mmacro(t, &params);
if (m) {
mname = t->text;
} else {
Token *last;
/*
* We have an id which isn't a macro call. We'll assume
* it might be a label; we'll also check to see if a
* colon follows it. Then, if there's another id after
* that lot, we'll check it again for macro-hood.
*/
label = last = t;
t = t->next;
if (tok_type_(t, TOK_WHITESPACE))
last = t, t = t->next;
if (tok_is_(t, ":")) {
dont_prepend = 1;
last = t, t = t->next;
if (tok_type_(t, TOK_WHITESPACE))
last = t, t = t->next;
}
if (!tok_type_(t, TOK_ID) || !(m = is_mmacro(t, &params)))
return 0;
last->next = NULL;
mname = t->text;
tline = t;
}
/*
* Fix up the parameters: this involves stripping leading and
* trailing whitespace, then stripping braces if they are
* present.
*/
for (nparam = 0; params[nparam]; nparam++) ;
paramlen = nparam ? nasm_malloc(nparam * sizeof(*paramlen)) : NULL;
for (i = 0; params[i]; i++) {
int brace = 0;
int comma = (!m->plus || i < nparam - 1);
t = params[i];
skip_white_(t);
if (tok_is_(t, "{"))
t = t->next, brace++, comma = false;
params[i] = t;
paramlen[i] = 0;
while (t) {
if (comma && t->type == TOK_OTHER && !strcmp(t->text, ","))
break; /* ... because we have hit a comma */
if (comma && t->type == TOK_WHITESPACE
&& tok_is_(t->next, ","))
break; /* ... or a space then a comma */
if (brace && t->type == TOK_OTHER) {
if (t->text[0] == '{')
brace++; /* ... or a nested opening brace */
else if (t->text[0] == '}')
if (!--brace)
break; /* ... or a brace */
}
t = t->next;
paramlen[i]++;
}
if (brace)
nasm_error(ERR_NONFATAL, "macro params should be enclosed in braces");
}
/*
* OK, we have a MMacro structure together with a set of
* parameters. We must now go through the expansion and push
* copies of each Line on to istk->expansion. Substitution of
* parameter tokens and macro-local tokens doesn't get done
* until the single-line macro substitution process; this is
* because delaying them allows us to change the semantics
* later through %rotate.
*
* First, push an end marker on to istk->expansion, mark this
* macro as in progress, and set up its invocation-specific
* variables.
*/
ll = nasm_malloc(sizeof(Line));
ll->next = istk->expansion;
ll->finishes = m;
ll->first = NULL;
istk->expansion = ll;
/*
* Save the previous MMacro expansion in the case of
* macro recursion
*/
if (m->max_depth && m->in_progress)
push_mmacro(m);
m->in_progress ++;
m->params = params;
m->iline = tline;
m->nparam = nparam;
m->rotate = 0;
m->paramlen = paramlen;
m->unique = unique++;
m->lineno = 0;
m->condcnt = 0;
m->next_active = istk->mstk;
istk->mstk = m;
list_for_each(l, m->expansion) {
Token **tail;
ll = nasm_malloc(sizeof(Line));
ll->finishes = NULL;
ll->next = istk->expansion;
istk->expansion = ll;
tail = &ll->first;
list_for_each(t, l->first) {
Token *x = t;
switch (t->type) {
case TOK_PREPROC_Q:
tt = *tail = new_Token(NULL, TOK_ID, mname, 0);
break;
case TOK_PREPROC_QQ:
tt = *tail = new_Token(NULL, TOK_ID, m->name, 0);
break;
case TOK_PREPROC_ID:
if (t->text[1] == '0' && t->text[2] == '0') {
dont_prepend = -1;
x = label;
if (!x)
continue;
}
/* fall through */
default:
tt = *tail = new_Token(NULL, x->type, x->text, 0);
break;
}
tail = &tt->next;
}
*tail = NULL;
}
/*
* If we had a label, push it on as the first line of
* the macro expansion.
*/
if (label) {
if (dont_prepend < 0)
free_tlist(startline);
else {
ll = nasm_malloc(sizeof(Line));
ll->finishes = NULL;
ll->next = istk->expansion;
istk->expansion = ll;
ll->first = startline;
if (!dont_prepend) {
while (label->next)
label = label->next;
label->next = tt = new_Token(NULL, TOK_OTHER, ":", 0);
}
}
}
lfmt->uplevel(m->nolist ? LIST_MACRO_NOLIST : LIST_MACRO);
return 1;
}
/*
* This function adds macro names to error messages, and suppresses
* them if necessary.
*/
static void pp_verror(int severity, const char *fmt, va_list arg)
{
char buff[BUFSIZ];
MMacro *mmac = NULL;
int delta = 0;
/*
* If we're in a dead branch of IF or something like it, ignore the error.
* However, because %else etc are evaluated in the state context
* of the previous branch, errors might get lost:
* %if 0 ... %else trailing garbage ... %endif
* So %else etc should set the ERR_PP_PRECOND flag.
*/
if ((severity & ERR_MASK) < ERR_FATAL &&
istk && istk->conds &&
((severity & ERR_PP_PRECOND) ?
istk->conds->state == COND_NEVER :
!emitting(istk->conds->state)))
return;
/* get %macro name */
if (!(severity & ERR_NOFILE) && istk && istk->mstk) {
mmac = istk->mstk;
/* but %rep blocks should be skipped */
while (mmac && !mmac->name)
mmac = mmac->next_active, delta++;
}
if (mmac) {
vsnprintf(buff, sizeof(buff), fmt, arg);
nasm_set_verror(real_verror);
nasm_error(severity, "(%s:%d) %s",
mmac->name, mmac->lineno - delta, buff);
nasm_set_verror(pp_verror);
} else {
real_verror(severity, fmt, arg);
}
}
static void
pp_reset(char *file, int apass, StrList **deplist)
{
Token *t;
cstk = NULL;
istk = nasm_malloc(sizeof(Include));
istk->next = NULL;
istk->conds = NULL;
istk->expansion = NULL;
istk->mstk = NULL;
istk->fp = nasm_open_read(file, NF_TEXT);
istk->fname = NULL;
src_set(0, file);
istk->lineinc = 1;
if (!istk->fp)
nasm_fatal(ERR_NOFILE, "unable to open input file `%s'", file);
defining = NULL;
nested_mac_count = 0;
nested_rep_count = 0;
init_macros();
unique = 0;
if (tasm_compatible_mode)
pp_add_stdmac(nasm_stdmac_tasm);
pp_add_stdmac(nasm_stdmac_nasm);
pp_add_stdmac(nasm_stdmac_version);
if (extrastdmac)
pp_add_stdmac(extrastdmac);
stdmacpos = stdmacros[0];
stdmacnext = &stdmacros[1];
do_predef = true;
/*
* 0 for dependencies, 1 for preparatory passes, 2 for final pass.
* The caller, however, will also pass in 3 for preprocess-only so
* we can set __PASS__ accordingly.
*/
pass = apass > 2 ? 2 : apass;
dephead = deplist;
nasm_add_string_to_strlist(dephead, file);
/*
* Define the __PASS__ macro. This is defined here unlike
* all the other builtins, because it is special -- it varies between
* passes.
*/
t = nasm_malloc(sizeof(*t));
t->next = NULL;
make_tok_num(t, apass);
t->a.mac = NULL;
define_smacro(NULL, "__PASS__", true, 0, t);
}
static void pp_init(void)
{
hash_init(&FileHash, HASH_MEDIUM);
}
static char *pp_getline(void)
{
char *line;
Token *tline;
real_verror = nasm_set_verror(pp_verror);
while (1) {
/*
* Fetch a tokenized line, either from the macro-expansion
* buffer or from the input file.
*/
tline = NULL;
while (istk->expansion && istk->expansion->finishes) {
Line *l = istk->expansion;
if (!l->finishes->name && l->finishes->in_progress > 1) {
Line *ll;
/*
* This is a macro-end marker for a macro with no
* name, which means it's not really a macro at all
* but a %rep block, and the `in_progress' field is
* more than 1, meaning that we still need to
* repeat. (1 means the natural last repetition; 0
* means termination by %exitrep.) We have
* therefore expanded up to the %endrep, and must
* push the whole block on to the expansion buffer
* again. We don't bother to remove the macro-end
* marker: we'd only have to generate another one
* if we did.
*/
l->finishes->in_progress--;
list_for_each(l, l->finishes->expansion) {
Token *t, *tt, **tail;
ll = nasm_malloc(sizeof(Line));
ll->next = istk->expansion;
ll->finishes = NULL;
ll->first = NULL;
tail = &ll->first;
list_for_each(t, l->first) {
if (t->text || t->type == TOK_WHITESPACE) {
tt = *tail = new_Token(NULL, t->type, t->text, 0);
tail = &tt->next;
}
}
istk->expansion = ll;
}
} else {
/*
* Check whether a `%rep' was started and not ended
* within this macro expansion. This can happen and
* should be detected. It's a fatal error because
* I'm too confused to work out how to recover
* sensibly from it.
*/
if (defining) {
if (defining->name)
nasm_panic(0, "defining with name in expansion");
else if (istk->mstk->name)
nasm_fatal(0, "`%%rep' without `%%endrep' within"
" expansion of macro `%s'",
istk->mstk->name);
}
/*
* FIXME: investigate the relationship at this point between
* istk->mstk and l->finishes
*/
{
MMacro *m = istk->mstk;
istk->mstk = m->next_active;
if (m->name) {
/*
* This was a real macro call, not a %rep, and
* therefore the parameter information needs to
* be freed.
*/
if (m->prev) {
pop_mmacro(m);
l->finishes->in_progress --;
} else {
nasm_free(m->params);
free_tlist(m->iline);
nasm_free(m->paramlen);
l->finishes->in_progress = 0;
}
} else
free_mmacro(m);
}
istk->expansion = l->next;
nasm_free(l);
lfmt->downlevel(LIST_MACRO);
}
}
while (1) { /* until we get a line we can use */
if (istk->expansion) { /* from a macro expansion */
char *p;
Line *l = istk->expansion;
if (istk->mstk)
istk->mstk->lineno++;
tline = l->first;
istk->expansion = l->next;
nasm_free(l);
p = detoken(tline, false);
lfmt->line(LIST_MACRO, p);
nasm_free(p);
break;
}
line = read_line();
if (line) { /* from the current input file */
line = prepreproc(line);
tline = tokenize(line);
nasm_free(line);
break;
}
/*
* The current file has ended; work down the istk
*/
{
Include *i = istk;
fclose(i->fp);
if (i->conds) {
/* nasm_error can't be conditionally suppressed */
nasm_fatal(0,
"expected `%%endif' before end of file");
}
/* only set line and file name if there's a next node */
if (i->next)
src_set(i->lineno, i->fname);
istk = i->next;
lfmt->downlevel(LIST_INCLUDE);
nasm_free(i);
if (!istk) {
line = NULL;
goto done;
}
if (istk->expansion && istk->expansion->finishes)
break;
}
}
/*
* We must expand MMacro parameters and MMacro-local labels
* _before_ we plunge into directive processing, to cope
* with things like `%define something %1' such as STRUC
* uses. Unless we're _defining_ a MMacro, in which case
* those tokens should be left alone to go into the
* definition; and unless we're in a non-emitting
* condition, in which case we don't want to meddle with
* anything.
*/
if (!defining && !(istk->conds && !emitting(istk->conds->state))
&& !(istk->mstk && !istk->mstk->in_progress)) {
tline = expand_mmac_params(tline);
}
/*
* Check the line to see if it's a preprocessor directive.
*/
if (do_directive(tline, &line) == DIRECTIVE_FOUND) {
if (line)
break; /* Directive generated output */
else
continue;
} else if (defining) {
/*
* We're defining a multi-line macro. We emit nothing
* at all, and just
* shove the tokenized line on to the macro definition.
*/
Line *l = nasm_malloc(sizeof(Line));
l->next = defining->expansion;
l->first = tline;
l->finishes = NULL;
defining->expansion = l;
continue;
} else if (istk->conds && !emitting(istk->conds->state)) {
/*
* We're in a non-emitting branch of a condition block.
* Emit nothing at all, not even a blank line: when we
* emerge from the condition we'll give a line-number
* directive so we keep our place correctly.
*/
free_tlist(tline);
continue;
} else if (istk->mstk && !istk->mstk->in_progress) {
/*
* We're in a %rep block which has been terminated, so
* we're walking through to the %endrep without
* emitting anything. Emit nothing at all, not even a
* blank line: when we emerge from the %rep block we'll
* give a line-number directive so we keep our place
* correctly.
*/
free_tlist(tline);
continue;
} else {
tline = expand_smacro(tline);
if (!expand_mmacro(tline)) {
/*
* De-tokenize the line again, and emit it.
*/
line = detoken(tline, true);
free_tlist(tline);
break;
} else {
continue; /* expand_mmacro calls free_tlist */
}
}
}
done:
nasm_set_verror(real_verror);
return line;
}
static void pp_cleanup(int pass)
{
real_verror = nasm_set_verror(pp_verror);
if (defining) {
if (defining->name) {
nasm_error(ERR_NONFATAL,
"end of file while still defining macro `%s'",
defining->name);
} else {
nasm_error(ERR_NONFATAL, "end of file while still in %%rep");
}
free_mmacro(defining);
defining = NULL;
}
nasm_set_verror(real_verror);
while (cstk)
ctx_pop();
free_macros();
while (istk) {
Include *i = istk;
istk = istk->next;
fclose(i->fp);
nasm_free(i);
}
while (cstk)
ctx_pop();
src_set_fname(NULL);
if (pass == 0) {
IncPath *i;
free_llist(predef);
predef = NULL;
delete_Blocks();
freeTokens = NULL;
while ((i = ipath)) {
ipath = i->next;
if (i->path)
nasm_free(i->path);
nasm_free(i);
}
}
}
static void pp_include_path(char *path)
{
IncPath *i;
i = nasm_malloc(sizeof(IncPath));
i->path = path ? nasm_strdup(path) : NULL;
i->next = NULL;
if (ipath) {
IncPath *j = ipath;
while (j->next)
j = j->next;
j->next = i;
} else {
ipath = i;
}
}
static void pp_pre_include(char *fname)
{
Token *inc, *space, *name;
Line *l;
name = new_Token(NULL, TOK_INTERNAL_STRING, fname, 0);
space = new_Token(name, TOK_WHITESPACE, NULL, 0);
inc = new_Token(space, TOK_PREPROC_ID, "%include", 0);
l = nasm_malloc(sizeof(Line));
l->next = predef;
l->first = inc;
l->finishes = NULL;
predef = l;
}
static void pp_pre_define(char *definition)
{
Token *def, *space;
Line *l;
char *equals;
real_verror = nasm_set_verror(pp_verror);
equals = strchr(definition, '=');
space = new_Token(NULL, TOK_WHITESPACE, NULL, 0);
def = new_Token(space, TOK_PREPROC_ID, "%define", 0);
if (equals)
*equals = ' ';
space->next = tokenize(definition);
if (equals)
*equals = '=';
if (space->next->type != TOK_PREPROC_ID &&
space->next->type != TOK_ID)
nasm_error(ERR_WARNING, "pre-defining non ID `%s\'\n", definition);
l = nasm_malloc(sizeof(Line));
l->next = predef;
l->first = def;
l->finishes = NULL;
predef = l;
nasm_set_verror(real_verror);
}
static void pp_pre_undefine(char *definition)
{
Token *def, *space;
Line *l;
space = new_Token(NULL, TOK_WHITESPACE, NULL, 0);
def = new_Token(space, TOK_PREPROC_ID, "%undef", 0);
space->next = tokenize(definition);
l = nasm_malloc(sizeof(Line));
l->next = predef;
l->first = def;
l->finishes = NULL;
predef = l;
}
static void pp_add_stdmac(macros_t *macros)
{
macros_t **mp;
/* Find the end of the list and avoid duplicates */
for (mp = stdmacros; *mp; mp++) {
if (*mp == macros)
return; /* Nothing to do */
}
nasm_assert(mp < &stdmacros[ARRAY_SIZE(stdmacros)-1]);
*mp = macros;
}
static void pp_extra_stdmac(macros_t *macros)
{
extrastdmac = macros;
}
static void make_tok_num(Token * tok, int64_t val)
{
char numbuf[32];
snprintf(numbuf, sizeof(numbuf), "%"PRId64"", val);
tok->text = nasm_strdup(numbuf);
tok->type = TOK_NUMBER;
}
static void pp_list_one_macro(MMacro *m, int severity)
{
if (!m)
return;
/* We need to print the next_active list in reverse order */
pp_list_one_macro(m->next_active, severity);
if (m->name && !m->nolist) {
src_set(m->xline + m->lineno, m->fname);
nasm_error(severity, "... from macro `%s' defined here", m->name);
}
}
static void pp_error_list_macros(int severity)
{
int32_t saved_line;
const char *saved_fname = NULL;
severity |= ERR_PP_LISTMACRO | ERR_NO_SEVERITY;
src_get(&saved_line, &saved_fname);
if (istk)
pp_list_one_macro(istk->mstk, severity);
src_set(saved_line, saved_fname);
}
const struct preproc_ops nasmpp = {
pp_init,
pp_reset,
pp_getline,
pp_cleanup,
pp_extra_stdmac,
pp_pre_define,
pp_pre_undefine,
pp_pre_include,
pp_include_path,
pp_error_list_macros,
};
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