/* C preprocessor macro expansion for GDB.
- Copyright 2002 Free Software Foundation, Inc.
+ Copyright (C) 2002-2023 Free Software Foundation, Inc.
Contributed by Red Hat, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
+ the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
-#include "gdb_obstack.h"
-#include "bcache.h"
+#include "gdbsupport/gdb_obstack.h"
#include "macrotab.h"
#include "macroexp.h"
-#include "gdb_assert.h"
+#include "macroscope.h"
+#include "c-lang.h"
\f
-/* A resizeable, substringable string type. */
+/* A string type that we can use to refer to substrings of other
+ strings. */
-/* A string type that we can resize, quickly append to, and use to
- refer to substrings of other strings. */
-struct macro_buffer
+struct shared_macro_buffer
{
- /* An array of characters. The first LEN bytes are the real text,
- but there are SIZE bytes allocated to the array. If SIZE is
- zero, then this doesn't point to a malloc'ed block. If SHARED is
- non-zero, then this buffer is actually a pointer into some larger
- string, and we shouldn't append characters to it, etc. Because
- of sharing, we can't assume in general that the text is
+ /* An array of characters. This buffer is a pointer into some
+ larger string and thus we can't assume in that the text is
null-terminated. */
- char *text;
+ const char *text;
/* The number of characters in the string. */
int len;
- /* The number of characters allocated to the string. If SHARED is
- non-zero, this is meaningless; in this case, we set it to zero so
- that any "do we have room to append something?" tests will fail,
- so we don't always have to check SHARED before using this field. */
- int size;
-
- /* Zero if TEXT can be safely realloc'ed (i.e., it's its own malloc
- block). Non-zero if TEXT is actually pointing into the middle of
- some other block, and we shouldn't reallocate it. */
- int shared;
-
/* For detecting token splicing.
This is the index in TEXT of the first character of the token
no token abutting the end of TEXT (it's just whitespace), and
again, we set this equal to LEN. We set this to -1 if we don't
know the nature of TEXT. */
- int last_token;
+ int last_token = -1;
/* If this buffer is holding the result from get_token, then this
is non-zero if it is an identifier token, zero otherwise. */
- int is_identifier;
-};
+ int is_identifier = 0;
+ shared_macro_buffer ()
+ : text (NULL),
+ len (0)
+ {
+ }
-/* Set the macro buffer *B to the empty string, guessing that its
- final contents will fit in N bytes. (It'll get resized if it
- doesn't, so the guess doesn't have to be right.) Allocate the
- initial storage with xmalloc. */
-static void
-init_buffer (struct macro_buffer *b, int n)
-{
- /* Small value for initial testing. */
- n = 1;
+ /* Set the macro buffer to refer to the LEN bytes at ADDR, as a
+ shared substring. */
+ shared_macro_buffer (const char *addr, int len)
+ {
+ set_shared (addr, len);
+ }
- b->size = n;
- if (n > 0)
- b->text = (char *) xmalloc (n);
- else
- b->text = NULL;
- b->len = 0;
- b->shared = 0;
- b->last_token = -1;
-}
+ /* Set the macro buffer to refer to the LEN bytes at ADDR, as a
+ shared substring. */
+ void set_shared (const char *addr, int len_)
+ {
+ text = addr;
+ len = len_;
+ }
+};
+/* A string type that we can resize and quickly append to. */
-/* Set the macro buffer *BUF to refer to the LEN bytes at ADDR, as a
- shared substring. */
-static void
-init_shared_buffer (struct macro_buffer *buf, char *addr, int len)
+struct growable_macro_buffer
{
- buf->text = addr;
- buf->len = len;
- buf->shared = 1;
- buf->size = 0;
- buf->last_token = -1;
-}
+ /* An array of characters. The first LEN bytes are the real text,
+ but there are SIZE bytes allocated to the array. */
+ char *text;
+ /* The number of characters in the string. */
+ int len;
-/* Free the text of the buffer B. Raise an error if B is shared. */
-static void
-free_buffer (struct macro_buffer *b)
-{
- gdb_assert (! b->shared);
- if (b->size)
- xfree (b->text);
-}
+ /* The number of characters allocated to the string. */
+ int size;
+ /* For detecting token splicing.
-/* A cleanup function for macro buffers. */
-static void
-cleanup_macro_buffer (void *untyped_buf)
-{
- free_buffer ((struct macro_buffer *) untyped_buf);
-}
+ This is the index in TEXT of the first character of the token
+ that abuts the end of TEXT. If TEXT contains no tokens, then we
+ set this equal to LEN. If TEXT ends in whitespace, then there is
+ no token abutting the end of TEXT (it's just whitespace), and
+ again, we set this equal to LEN. We set this to -1 if we don't
+ know the nature of TEXT. */
+ int last_token = -1;
+
+ /* Set the macro buffer to the empty string, guessing that its
+ final contents will fit in N bytes. (It'll get resized if it
+ doesn't, so the guess doesn't have to be right.) Allocate the
+ initial storage with xmalloc. */
+ explicit growable_macro_buffer (int n)
+ : len (0),
+ size (n)
+ {
+ if (n > 0)
+ text = (char *) xmalloc (n);
+ else
+ text = NULL;
+ }
+ DISABLE_COPY_AND_ASSIGN (growable_macro_buffer);
-/* Resize the buffer B to be at least N bytes long. Raise an error if
- B shouldn't be resized. */
-static void
-resize_buffer (struct macro_buffer *b, int n)
-{
- /* We shouldn't be trying to resize shared strings. */
- gdb_assert (! b->shared);
-
- if (b->size == 0)
- b->size = n;
- else
- while (b->size <= n)
- b->size *= 2;
+ ~growable_macro_buffer ()
+ {
+ xfree (text);
+ }
- b->text = xrealloc (b->text, b->size);
-}
+ /* Release the text of the buffer to the caller. */
+ gdb::unique_xmalloc_ptr<char> release ()
+ {
+ gdb_assert (size);
+ char *result = text;
+ text = NULL;
+ return gdb::unique_xmalloc_ptr<char> (result);
+ }
+ /* Resize the buffer to be at least N bytes long. */
+ void resize_buffer (int n)
+ {
+ if (size == 0)
+ size = n;
+ else
+ while (size <= n)
+ size *= 2;
-/* Append the character C to the buffer B. */
-static void
-appendc (struct macro_buffer *b, int c)
-{
- int new_len = b->len + 1;
+ text = (char *) xrealloc (text, size);
+ }
- if (new_len > b->size)
- resize_buffer (b, new_len);
+ /* Append the character C to the buffer. */
+ void appendc (int c)
+ {
+ int new_len = len + 1;
- b->text[b->len] = c;
- b->len = new_len;
-}
+ if (new_len > size)
+ resize_buffer (new_len);
+ text[len] = c;
+ len = new_len;
+ }
-/* Append the LEN bytes at ADDR to the buffer B. */
-static void
-appendmem (struct macro_buffer *b, char *addr, int len)
-{
- int new_len = b->len + len;
+ /* Append the COUNT bytes at ADDR to the buffer. */
+ void appendmem (const char *addr, int count)
+ {
+ int new_len = len + count;
- if (new_len > b->size)
- resize_buffer (b, new_len);
+ if (new_len > size)
+ resize_buffer (new_len);
- memcpy (b->text + b->len, addr, len);
- b->len = new_len;
-}
+ memcpy (text + len, addr, count);
+ len = new_len;
+ }
+};
\f
/* Recognizing preprocessor tokens. */
-static int
-is_whitespace (int c)
+int
+macro_is_whitespace (int c)
{
return (c == ' '
- || c == '\t'
- || c == '\n'
- || c == '\v'
- || c == '\f');
+ || c == '\t'
+ || c == '\n'
+ || c == '\v'
+ || c == '\f');
}
-static int
-is_digit (int c)
+int
+macro_is_digit (int c)
{
return ('0' <= c && c <= '9');
}
-static int
-is_identifier_nondigit (int c)
+int
+macro_is_identifier_nondigit (int c)
{
return (c == '_'
- || ('a' <= c && c <= 'z')
- || ('A' <= c && c <= 'Z'));
+ || ('a' <= c && c <= 'z')
+ || ('A' <= c && c <= 'Z'));
}
static void
-set_token (struct macro_buffer *tok, char *start, char *end)
+set_token (shared_macro_buffer *tok, const char *start, const char *end)
{
- init_shared_buffer (tok, start, end - start);
+ tok->set_shared (start, end - start);
tok->last_token = 0;
- /* Presumed; get_identifier may overwrite this. */
+ /* Presumed; get_identifier may overwrite this. */
tok->is_identifier = 0;
}
static int
-get_comment (struct macro_buffer *tok, char *p, char *end)
+get_comment (shared_macro_buffer *tok, const char *p, const char *end)
{
if (p + 2 > end)
return 0;
else if (p[0] == '/'
- && p[1] == '*')
+ && p[1] == '*')
{
- char *tok_start = p;
+ const char *tok_start = p;
p += 2;
for (; p < end; p++)
- if (p + 2 <= end
- && p[0] == '*'
- && p[1] == '/')
- {
- p += 2;
- set_token (tok, tok_start, p);
- return 1;
- }
-
- error ("Unterminated comment in macro expansion.");
+ if (p + 2 <= end
+ && p[0] == '*'
+ && p[1] == '/')
+ {
+ p += 2;
+ set_token (tok, tok_start, p);
+ return 1;
+ }
+
+ error (_("Unterminated comment in macro expansion."));
}
else if (p[0] == '/'
- && p[1] == '/')
+ && p[1] == '/')
{
- char *tok_start = p;
+ const char *tok_start = p;
p += 2;
for (; p < end; p++)
- if (*p == '\n')
- break;
+ if (*p == '\n')
+ break;
set_token (tok, tok_start, p);
return 1;
static int
-get_identifier (struct macro_buffer *tok, char *p, char *end)
+get_identifier (shared_macro_buffer *tok, const char *p, const char *end)
{
if (p < end
- && is_identifier_nondigit (*p))
+ && macro_is_identifier_nondigit (*p))
{
- char *tok_start = p;
+ const char *tok_start = p;
while (p < end
- && (is_identifier_nondigit (*p)
- || is_digit (*p)))
- p++;
+ && (macro_is_identifier_nondigit (*p)
+ || macro_is_digit (*p)))
+ p++;
set_token (tok, tok_start, p);
tok->is_identifier = 1;
static int
-get_pp_number (struct macro_buffer *tok, char *p, char *end)
+get_pp_number (shared_macro_buffer *tok, const char *p, const char *end)
{
if (p < end
- && (is_digit (*p)
- || *p == '.'))
+ && (macro_is_digit (*p)
+ || (*p == '.'
+ && p + 2 <= end
+ && macro_is_digit (p[1]))))
{
- char *tok_start = p;
+ const char *tok_start = p;
while (p < end)
- {
- if (is_digit (*p)
- || is_identifier_nondigit (*p)
- || *p == '.')
- p++;
- else if (p + 2 <= end
- && strchr ("eEpP.", *p)
- && (p[1] == '+' || p[1] == '-'))
- p += 2;
- else
- break;
- }
+ {
+ if (p + 2 <= end
+ && strchr ("eEpP", *p)
+ && (p[1] == '+' || p[1] == '-'))
+ p += 2;
+ else if (macro_is_digit (*p)
+ || macro_is_identifier_nondigit (*p)
+ || *p == '.')
+ p++;
+ else
+ break;
+ }
set_token (tok, tok_start, p);
return 1;
Signal an error if it contains a malformed or incomplete character
constant. */
static int
-get_character_constant (struct macro_buffer *tok, char *p, char *end)
+get_character_constant (shared_macro_buffer *tok,
+ const char *p, const char *end)
{
/* ISO/IEC 9899:1999 (E) Section 6.4.4.4 paragraph 1
But of course, what really matters is that we handle it the same
way GDB's C/C++ lexer does. So we call parse_escape in utils.c
to handle escape sequences. */
if ((p + 1 <= end && *p == '\'')
- || (p + 2 <= end && p[0] == 'L' && p[1] == '\''))
+ || (p + 2 <= end
+ && (p[0] == 'L' || p[0] == 'u' || p[0] == 'U')
+ && p[1] == '\''))
{
- char *tok_start = p;
- char *body_start;
+ const char *tok_start = p;
+ int char_count = 0;
if (*p == '\'')
- p++;
- else if (*p == 'L')
- p += 2;
+ p++;
+ else if (*p == 'L' || *p == 'u' || *p == 'U')
+ p += 2;
else
- gdb_assert (0);
+ gdb_assert_not_reached ("unexpected character constant");
- body_start = p;
for (;;)
- {
- if (p >= end)
- error ("Unmatched single quote.");
- else if (*p == '\'')
- {
- if (p == body_start)
- error ("A character constant must contain at least one "
- "character.");
- p++;
- break;
- }
- else if (*p == '\\')
- {
- p++;
- parse_escape (&p);
- }
- else
- p++;
- }
+ {
+ if (p >= end)
+ error (_("Unmatched single quote."));
+ else if (*p == '\'')
+ {
+ if (!char_count)
+ error (_("A character constant must contain at least one "
+ "character."));
+ p++;
+ break;
+ }
+ else if (*p == '\\')
+ {
+ const char *s, *o;
+
+ s = o = ++p;
+ char_count += c_parse_escape (&s, NULL);
+ p += s - o;
+ }
+ else
+ {
+ p++;
+ char_count++;
+ }
+ }
set_token (tok, tok_start, p);
return 1;
literal, and return 1. Otherwise, return zero. Signal an error if
it contains a malformed or incomplete string literal. */
static int
-get_string_literal (struct macro_buffer *tok, char *p, char *end)
+get_string_literal (shared_macro_buffer *tok, const char *p, const char *end)
{
if ((p + 1 <= end
- && *p == '\"')
+ && *p == '"')
|| (p + 2 <= end
- && p[0] == 'L'
- && p[1] == '\"'))
+ && (p[0] == 'L' || p[0] == 'u' || p[0] == 'U')
+ && p[1] == '"'))
{
- char *tok_start = p;
+ const char *tok_start = p;
- if (*p == '\"')
- p++;
- else if (*p == 'L')
- p += 2;
+ if (*p == '"')
+ p++;
+ else if (*p == 'L' || *p == 'u' || *p == 'U')
+ p += 2;
else
- gdb_assert (0);
+ gdb_assert_not_reached ("unexpected string literal");
for (;;)
- {
- if (p >= end)
- error ("Unterminated string in expression.");
- else if (*p == '\"')
- {
- p++;
- break;
- }
- else if (*p == '\n')
- error ("Newline characters may not appear in string "
- "constants.");
- else if (*p == '\\')
- {
- p++;
- parse_escape (&p);
- }
- else
- p++;
- }
+ {
+ if (p >= end)
+ error (_("Unterminated string in expression."));
+ else if (*p == '"')
+ {
+ p++;
+ break;
+ }
+ else if (*p == '\n')
+ error (_("Newline characters may not appear in string "
+ "constants."));
+ else if (*p == '\\')
+ {
+ const char *s, *o;
+
+ s = o = ++p;
+ c_parse_escape (&s, NULL);
+ p += s - o;
+ }
+ else
+ p++;
+ }
set_token (tok, tok_start, p);
return 1;
static int
-get_punctuator (struct macro_buffer *tok, char *p, char *end)
+get_punctuator (shared_macro_buffer *tok, const char *p, const char *end)
{
/* Here, speed is much less important than correctness and clarity. */
- /* ISO/IEC 9899:1999 (E) Section 6.4.6 Paragraph 1 */
+ /* ISO/IEC 9899:1999 (E) Section 6.4.6 Paragraph 1.
+ Note that this table is ordered in a special way. A punctuator
+ which is a prefix of another punctuator must appear after its
+ "extension". Otherwise, the wrong token will be returned. */
static const char * const punctuators[] = {
- "[", "]", "(", ")", "{", "}", ".", "->",
- "++", "--", "&", "*", "+", "-", "~", "!",
- "/", "%", "<<", ">>", "<", ">", "<=", ">=", "==", "!=",
- "^", "|", "&&", "||",
- "?", ":", ";", "...",
- "=", "*=", "/=", "%=", "+=", "-=", "<<=", ">>=", "&=", "^=", "|=",
- ",", "#", "##",
- "<:", ":>", "<%", "%>", "%:", "%:%:",
+ "[", "]", "(", ")", "{", "}", "?", ";", ",", "~",
+ "...", ".",
+ "->", "--", "-=", "-",
+ "++", "+=", "+",
+ "*=", "*",
+ "!=", "!",
+ "&&", "&=", "&",
+ "/=", "/",
+ "%>", "%:%:", "%:", "%=", "%",
+ "^=", "^",
+ "##", "#",
+ ":>", ":",
+ "||", "|=", "|",
+ "<<=", "<<", "<=", "<:", "<%", "<",
+ ">>=", ">>", ">=", ">",
+ "==", "=",
0
};
if (p + 1 <= end)
{
for (i = 0; punctuators[i]; i++)
- {
- const char *punctuator = punctuators[i];
-
- if (p[0] == punctuator[0])
- {
- int len = strlen (punctuator);
-
- if (p + len <= end
- && ! memcmp (p, punctuator, len))
- {
- set_token (tok, p, p + len);
- return 1;
- }
- }
- }
+ {
+ const char *punctuator = punctuators[i];
+
+ if (p[0] == punctuator[0])
+ {
+ int len = strlen (punctuator);
+
+ if (p + len <= end
+ && ! memcmp (p, punctuator, len))
+ {
+ set_token (tok, p, p + len);
+ return 1;
+ }
+ }
+ }
}
return 0;
/* Peel the next preprocessor token off of SRC, and put it in TOK.
Mutate TOK to refer to the first token in SRC, and mutate SRC to
- refer to the text after that token. SRC must be a shared buffer;
- the resulting TOK will be shared, pointing into the same string SRC
- does. Initialize TOK's last_token field. Return non-zero if we
- succeed, or 0 if we didn't find any more tokens in SRC. */
+ refer to the text after that token. The resulting TOK will point
+ into the same string SRC does. Initialize TOK's last_token field.
+ Return non-zero if we succeed, or 0 if we didn't find any more
+ tokens in SRC. */
+
static int
-get_token (struct macro_buffer *tok,
- struct macro_buffer *src)
+get_token (shared_macro_buffer *tok, shared_macro_buffer *src)
{
- char *p = src->text;
- char *end = p + src->len;
-
- gdb_assert (src->shared);
+ const char *p = src->text;
+ const char *end = p + src->len;
/* From the ISO C standard, ISO/IEC 9899:1999 (E), section 6.4:
preprocessing-token:
- header-name
- identifier
- pp-number
- character-constant
- string-literal
- punctuator
- each non-white-space character that cannot be one of the above
+ header-name
+ identifier
+ pp-number
+ character-constant
+ string-literal
+ punctuator
+ each non-white-space character that cannot be one of the above
We don't have to deal with header-name tokens, since those can
only occur after a #include, which we will never see. */
while (p < end)
- if (is_whitespace (*p))
+ if (macro_is_whitespace (*p))
p++;
else if (get_comment (tok, p, end))
p += tok->len;
else if (get_pp_number (tok, p, end)
- || get_character_constant (tok, p, end)
- || get_string_literal (tok, p, end)
- /* Note: the grammar in the standard seems to be
- ambiguous: L'x' can be either a wide character
- constant, or an identifier followed by a normal
- character constant. By trying `get_identifier' after
- we try get_character_constant and get_string_literal,
- we give the wide character syntax precedence. Now,
- since GDB doesn't handle wide character constants
- anyway, is this the right thing to do? */
- || get_identifier (tok, p, end)
- || get_punctuator (tok, p, end))
+ || get_character_constant (tok, p, end)
+ || get_string_literal (tok, p, end)
+ /* Note: the grammar in the standard seems to be
+ ambiguous: L'x' can be either a wide character
+ constant, or an identifier followed by a normal
+ character constant. By trying `get_identifier' after
+ we try get_character_constant and get_string_literal,
+ we give the wide character syntax precedence. Now,
+ since GDB doesn't handle wide character constants
+ anyway, is this the right thing to do? */
+ || get_identifier (tok, p, end)
+ || get_punctuator (tok, p, end))
{
- /* How many characters did we consume, including whitespace? */
- int consumed = p - src->text + tok->len;
- src->text += consumed;
- src->len -= consumed;
- return 1;
+ /* How many characters did we consume, including whitespace? */
+ int consumed = p - src->text + tok->len;
+
+ src->text += consumed;
+ src->len -= consumed;
+ return 1;
}
else
{
- /* We have found a "non-whitespace character that cannot be
- one of the above." Make a token out of it. */
- int consumed;
-
- set_token (tok, p, p + 1);
- consumed = p - src->text + tok->len;
- src->text += consumed;
- src->len -= consumed;
- return 1;
+ /* We have found a "non-whitespace character that cannot be
+ one of the above." Make a token out of it. */
+ int consumed;
+
+ set_token (tok, p, p + 1);
+ consumed = p - src->text + tok->len;
+ src->text += consumed;
+ src->len -= consumed;
+ return 1;
}
return 0;
fine to return with DEST set to "x y". Similarly, "<" and "<" must
yield "< <", not "<<", etc. */
static void
-append_tokens_without_splicing (struct macro_buffer *dest,
- struct macro_buffer *src)
+append_tokens_without_splicing (growable_macro_buffer *dest,
+ shared_macro_buffer *src)
{
int original_dest_len = dest->len;
- struct macro_buffer dest_tail, new_token;
+ shared_macro_buffer dest_tail, new_token;
gdb_assert (src->last_token != -1);
gdb_assert (dest->last_token != -1);
/* First, just try appending the two, and call get_token to see if
we got a splice. */
- appendmem (dest, src->text, src->len);
+ dest->appendmem (src->text, src->len);
/* If DEST originally had no token abutting its end, then we can't
have spliced anything, so we're done. */
/* Set DEST_TAIL to point to the last token in DEST, followed by
all the stuff we just appended. */
- init_shared_buffer (&dest_tail,
- dest->text + dest->last_token,
- dest->len - dest->last_token);
+ dest_tail.set_shared (dest->text + dest->last_token,
+ dest->len - dest->last_token);
/* Re-parse DEST's last token. We know that DEST used to contain
at least one token, so if it doesn't contain any after the
the first time. This is not a bug fix.) */
if (get_token (&new_token, &dest_tail)
&& (new_token.text + new_token.len
- == dest->text + original_dest_len))
+ == dest->text + original_dest_len))
{
/* No splice, so we're done. */
dest->last_token = original_dest_len + src->last_token;
its original length and try again, but separate the texts with a
space. */
dest->len = original_dest_len;
- appendc (dest, ' ');
- appendmem (dest, src->text, src->len);
+ dest->appendc (' ');
+ dest->appendmem (src->text, src->len);
- init_shared_buffer (&dest_tail,
- dest->text + dest->last_token,
- dest->len - dest->last_token);
+ dest_tail.set_shared (dest->text + dest->last_token,
+ dest->len - dest->last_token);
/* Try to re-parse DEST's last token, as above. */
if (get_token (&new_token, &dest_tail)
&& (new_token.text + new_token.len
- == dest->text + original_dest_len))
+ == dest->text + original_dest_len))
{
/* No splice, so we're done. */
dest->last_token = original_dest_len + 1 + src->last_token;
/* As far as I know, there's no case where inserting a space isn't
enough to prevent a splice. */
- internal_error (__FILE__, __LINE__,
- "unable to avoid splicing tokens during macro expansion");
+ internal_error (_("unable to avoid splicing tokens during macro expansion"));
}
+/* Stringify an argument, and insert it into DEST. ARG is the text to
+ stringify; it is LEN bytes long. */
+
+static void
+stringify (growable_macro_buffer *dest, const char *arg, int len)
+{
+ /* Trim initial whitespace from ARG. */
+ while (len > 0 && macro_is_whitespace (*arg))
+ {
+ ++arg;
+ --len;
+ }
+
+ /* Trim trailing whitespace from ARG. */
+ while (len > 0 && macro_is_whitespace (arg[len - 1]))
+ --len;
+
+ /* Insert the string. */
+ dest->appendc ('"');
+ while (len > 0)
+ {
+ /* We could try to handle strange cases here, like control
+ characters, but there doesn't seem to be much point. */
+ if (macro_is_whitespace (*arg))
+ {
+ /* Replace a sequence of whitespace with a single space. */
+ dest->appendc (' ');
+ while (len > 1 && macro_is_whitespace (arg[1]))
+ {
+ ++arg;
+ --len;
+ }
+ }
+ else if (*arg == '\\' || *arg == '"')
+ {
+ dest->appendc ('\\');
+ dest->appendc (*arg);
+ }
+ else
+ dest->appendc (*arg);
+ ++arg;
+ --len;
+ }
+ dest->appendc ('"');
+ dest->last_token = dest->len;
+}
+
+/* See macroexp.h. */
+
+gdb::unique_xmalloc_ptr<char>
+macro_stringify (const char *str)
+{
+ int len = strlen (str);
+ growable_macro_buffer buffer (len);
+
+ stringify (&buffer, str, len);
+ buffer.appendc ('\0');
+
+ return buffer.release ();
+}
\f
/* Expanding macros! */
particular macro, and otherwise delegates the decision to another
function/baton pair. But that makes the linked list of excluded
macros chained through untyped baton pointers, which will make it
- harder to debug. :( */
+ harder to debug. :( */
static int
currently_rescanning (struct macro_name_list *list, const char *name)
{
baz).
If SRC doesn't start with an open paren ( token at all, return
- zero, leave SRC unchanged, and don't set *ARGC_P to anything.
+ false, leave SRC unchanged, and don't set *ARGS_PTR to anything.
If SRC doesn't contain a properly terminated argument list, then
raise an error.
- Otherwise, return a pointer to the first element of an array of
- macro buffers referring to the argument texts, and set *ARGC_P to
- the number of arguments we found --- the number of elements in the
- array. The macro buffers share their text with SRC, and their
- last_token fields are initialized. The array is allocated with
- xmalloc, and the caller is responsible for freeing it.
+ For a variadic macro, NARGS holds the number of formal arguments to
+ the macro. For a GNU-style variadic macro, this should be the
+ number of named arguments. For a non-variadic macro, NARGS should
+ be -1.
+
+ Otherwise, return true and set *ARGS_PTR to a vector of macro
+ buffers referring to the argument texts. The macro buffers share
+ their text with SRC, and their last_token fields are initialized.
NOTE WELL: if SRC starts with a open paren ( token followed
immediately by a close paren ) token (e.g., the invocation looks
Consume the tokens from SRC; after this call, SRC contains the text
following the invocation. */
-static struct macro_buffer *
-gather_arguments (const char *name, struct macro_buffer *src, int *argc_p)
+static bool
+gather_arguments (const char *name, shared_macro_buffer *src, int nargs,
+ std::vector<shared_macro_buffer> *args_ptr)
{
- struct macro_buffer tok;
- int args_len, args_size;
- struct macro_buffer *args = NULL;
- struct cleanup *back_to = make_cleanup (free_current_contents, &args);
+ shared_macro_buffer tok;
+ std::vector<shared_macro_buffer> args;
/* Does SRC start with an opening paren token? Read from a copy of
SRC, so SRC itself is unaffected if we don't find an opening
paren. */
{
- struct macro_buffer temp;
- init_shared_buffer (&temp, src->text, src->len);
+ shared_macro_buffer temp (src->text, src->len);
if (! get_token (&tok, &temp)
- || tok.len != 1
- || tok.text[0] != '(')
- {
- discard_cleanups (back_to);
- return 0;
- }
+ || tok.len != 1
+ || tok.text[0] != '(')
+ return false;
}
/* Consume SRC's opening paren. */
get_token (&tok, src);
- args_len = 0;
- args_size = 1; /* small for initial testing */
- args = (struct macro_buffer *) xmalloc (sizeof (*args) * args_size);
-
for (;;)
{
- struct macro_buffer *arg;
+ shared_macro_buffer *arg;
int depth;
- /* Make sure we have room for the next argument. */
- if (args_len >= args_size)
- {
- args_size *= 2;
- args = xrealloc (args, sizeof (*args) * args_size);
- }
-
/* Initialize the next argument. */
- arg = &args[args_len++];
+ args.emplace_back ();
+ arg = &args.back ();
set_token (arg, src->text, src->text);
/* Gather the argument's tokens. */
depth = 0;
for (;;)
- {
- char *start = src->text;
-
- if (! get_token (&tok, src))
- error ("Malformed argument list for macro `%s'.", name);
-
- /* Is tok an opening paren? */
- if (tok.len == 1 && tok.text[0] == '(')
- depth++;
-
- /* Is tok is a closing paren? */
- else if (tok.len == 1 && tok.text[0] == ')')
- {
- /* If it's a closing paren at the top level, then that's
- the end of the argument list. */
- if (depth == 0)
- {
- discard_cleanups (back_to);
- *argc_p = args_len;
- return args;
- }
-
- depth--;
- }
-
- /* If tok is a comma at top level, then that's the end of
- the current argument. */
- else if (tok.len == 1 && tok.text[0] == ',' && depth == 0)
- break;
-
- /* Extend the current argument to enclose this token. If
- this is the current argument's first token, leave out any
- leading whitespace, just for aesthetics. */
- if (arg->len == 0)
- {
- arg->text = tok.text;
- arg->len = tok.len;
- arg->last_token = 0;
- }
- else
- {
- arg->len = (tok.text + tok.len) - arg->text;
- arg->last_token = tok.text - arg->text;
- }
- }
+ {
+ if (! get_token (&tok, src))
+ error (_("Malformed argument list for macro `%s'."), name);
+
+ /* Is tok an opening paren? */
+ if (tok.len == 1 && tok.text[0] == '(')
+ depth++;
+
+ /* Is tok is a closing paren? */
+ else if (tok.len == 1 && tok.text[0] == ')')
+ {
+ /* If it's a closing paren at the top level, then that's
+ the end of the argument list. */
+ if (depth == 0)
+ {
+ /* In the varargs case, the last argument may be
+ missing. Add an empty argument in this case. */
+ if (nargs != -1 && args.size () == nargs - 1)
+ {
+ args.emplace_back ();
+ arg = &args.back ();
+ set_token (arg, src->text, src->text);
+ }
+
+ *args_ptr = std::move (args);
+ return true;
+ }
+
+ depth--;
+ }
+
+ /* If tok is a comma at top level, then that's the end of
+ the current argument. However, if we are handling a
+ variadic macro and we are computing the last argument, we
+ want to include the comma and remaining tokens. */
+ else if (tok.len == 1 && tok.text[0] == ',' && depth == 0
+ && (nargs == -1 || args.size () < nargs))
+ break;
+
+ /* Extend the current argument to enclose this token. If
+ this is the current argument's first token, leave out any
+ leading whitespace, just for aesthetics. */
+ if (arg->len == 0)
+ {
+ arg->text = tok.text;
+ arg->len = tok.len;
+ arg->last_token = 0;
+ }
+ else
+ {
+ arg->len = (tok.text + tok.len) - arg->text;
+ arg->last_token = tok.text - arg->text;
+ }
+ }
}
}
/* The `expand' and `substitute_args' functions both invoke `scan'
recursively, so we need a forward declaration somewhere. */
-static void scan (struct macro_buffer *dest,
- struct macro_buffer *src,
- struct macro_name_list *no_loop,
- macro_lookup_ftype *lookup_func,
- void *lookup_baton);
+static void scan (growable_macro_buffer *dest,
+ shared_macro_buffer *src,
+ struct macro_name_list *no_loop,
+ const macro_scope &scope);
+
+/* A helper function for substitute_args.
+
+ ARGV is a vector of all the arguments; ARGC is the number of
+ arguments. IS_VARARGS is true if the macro being substituted is a
+ varargs macro; in this case VA_ARG_NAME is the name of the
+ "variable" argument. VA_ARG_NAME is ignored if IS_VARARGS is
+ false.
+
+ If the token TOK is the name of a parameter, return the parameter's
+ index. If TOK is not an argument, return -1. */
+
+static int
+find_parameter (const shared_macro_buffer *tok,
+ int is_varargs, const shared_macro_buffer *va_arg_name,
+ int argc, const char * const *argv)
+{
+ int i;
+ if (! tok->is_identifier)
+ return -1;
+
+ for (i = 0; i < argc; ++i)
+ if (tok->len == strlen (argv[i])
+ && !memcmp (tok->text, argv[i], tok->len))
+ return i;
+
+ if (is_varargs && tok->len == va_arg_name->len
+ && ! memcmp (tok->text, va_arg_name->text, tok->len))
+ return argc - 1;
+
+ return -1;
+}
+
+/* Helper function for substitute_args that gets the next token and
+ updates the passed-in state variables. */
+
+static void
+get_next_token_for_substitution (shared_macro_buffer *replacement_list,
+ shared_macro_buffer *token,
+ const char **start,
+ shared_macro_buffer *lookahead,
+ const char **lookahead_start,
+ int *lookahead_valid,
+ bool *keep_going)
+{
+ if (!*lookahead_valid)
+ *keep_going = false;
+ else
+ {
+ *keep_going = true;
+ *token = *lookahead;
+ *start = *lookahead_start;
+ *lookahead_start = replacement_list->text;
+ *lookahead_valid = get_token (lookahead, replacement_list);
+ }
+}
/* Given the macro definition DEF, being invoked with the actual
- arguments given by ARGC and ARGV, substitute the arguments into the
+ arguments given by ARGV, substitute the arguments into the
replacement list, and store the result in DEST.
+ IS_VARARGS should be true if DEF is a varargs macro. In this case,
+ VA_ARG_NAME should be the name of the "variable" argument -- either
+ __VA_ARGS__ for c99-style varargs, or the final argument name, for
+ GNU-style varargs. If IS_VARARGS is false, this parameter is
+ ignored.
+
If it is necessary to expand macro invocations in one of the
arguments, use LOOKUP_FUNC and LOOKUP_BATON to find the macro
definitions, and don't expand invocations of the macros listed in
NO_LOOP. */
+
static void
-substitute_args (struct macro_buffer *dest,
- struct macro_definition *def,
- int argc, struct macro_buffer *argv,
- struct macro_name_list *no_loop,
- macro_lookup_ftype *lookup_func,
- void *lookup_baton)
+substitute_args (growable_macro_buffer *dest,
+ struct macro_definition *def,
+ int is_varargs, const shared_macro_buffer *va_arg_name,
+ const std::vector<shared_macro_buffer> &argv,
+ struct macro_name_list *no_loop,
+ const macro_scope &scope)
{
- /* A macro buffer for the macro's replacement list. */
- struct macro_buffer replacement_list;
+ /* The token we are currently considering. */
+ shared_macro_buffer tok;
+ /* The replacement list's pointer from just before TOK was lexed. */
+ const char *original_rl_start;
+ /* We have a single lookahead token to handle token splicing. */
+ shared_macro_buffer lookahead;
+ /* The lookahead token might not be valid. */
+ int lookahead_valid;
+ /* The replacement list's pointer from just before LOOKAHEAD was
+ lexed. */
+ const char *lookahead_rl_start;
- init_shared_buffer (&replacement_list, (char *) def->replacement,
- strlen (def->replacement));
+ /* A macro buffer for the macro's replacement list. */
+ shared_macro_buffer replacement_list (def->replacement,
+ strlen (def->replacement));
gdb_assert (dest->len == 0);
dest->last_token = 0;
- for (;;)
+ original_rl_start = replacement_list.text;
+ if (! get_token (&tok, &replacement_list))
+ return;
+ lookahead_rl_start = replacement_list.text;
+ lookahead_valid = get_token (&lookahead, &replacement_list);
+
+ /* __VA_OPT__ state variable. The states are:
+ 0 - nothing happening
+ 1 - saw __VA_OPT__
+ >= 2 in __VA_OPT__, the value encodes the parenthesis depth. */
+ unsigned vaopt_state = 0;
+
+ for (bool keep_going = true;
+ keep_going;
+ get_next_token_for_substitution (&replacement_list,
+ &tok,
+ &original_rl_start,
+ &lookahead,
+ &lookahead_rl_start,
+ &lookahead_valid,
+ &keep_going))
{
- struct macro_buffer tok;
- char *original_rl_start = replacement_list.text;
- int substituted = 0;
-
- /* Find the next token in the replacement list. */
- if (! get_token (&tok, &replacement_list))
- break;
+ bool token_is_vaopt = (tok.len == 10
+ && startswith (tok.text, "__VA_OPT__"));
+
+ if (vaopt_state > 0)
+ {
+ if (token_is_vaopt)
+ error (_("__VA_OPT__ cannot appear inside __VA_OPT__"));
+ else if (tok.len == 1 && tok.text[0] == '(')
+ {
+ ++vaopt_state;
+ /* We just entered __VA_OPT__, so don't emit this
+ token. */
+ continue;
+ }
+ else if (vaopt_state == 1)
+ error (_("__VA_OPT__ must be followed by an open parenthesis"));
+ else if (tok.len == 1 && tok.text[0] == ')')
+ {
+ --vaopt_state;
+ if (vaopt_state == 1)
+ {
+ /* Done with __VA_OPT__. */
+ vaopt_state = 0;
+ /* Don't emit. */
+ continue;
+ }
+ }
+
+ /* If __VA_ARGS__ is empty, then drop the contents of
+ __VA_OPT__. */
+ if (argv.back ().len == 0)
+ continue;
+ }
+ else if (token_is_vaopt)
+ {
+ if (!is_varargs)
+ error (_("__VA_OPT__ is only valid in a variadic macro"));
+ vaopt_state = 1;
+ /* Don't emit this token. */
+ continue;
+ }
/* Just for aesthetics. If we skipped some whitespace, copy
- that to DEST. */
+ that to DEST. */
if (tok.text > original_rl_start)
- {
- appendmem (dest, original_rl_start, tok.text - original_rl_start);
- dest->last_token = dest->len;
- }
+ {
+ dest->appendmem (original_rl_start, tok.text - original_rl_start);
+ dest->last_token = dest->len;
+ }
/* Is this token the stringification operator? */
if (tok.len == 1
- && tok.text[0] == '#')
- error ("Stringification is not implemented yet.");
-
+ && tok.text[0] == '#')
+ {
+ int arg;
+
+ if (!lookahead_valid)
+ error (_("Stringification operator requires an argument."));
+
+ arg = find_parameter (&lookahead, is_varargs, va_arg_name,
+ def->argc, def->argv);
+ if (arg == -1)
+ error (_("Argument to stringification operator must name "
+ "a macro parameter."));
+
+ stringify (dest, argv[arg].text, argv[arg].len);
+
+ /* Read one token and let the loop iteration code handle the
+ rest. */
+ lookahead_rl_start = replacement_list.text;
+ lookahead_valid = get_token (&lookahead, &replacement_list);
+ }
/* Is this token the splicing operator? */
- if (tok.len == 2
- && tok.text[0] == '#'
- && tok.text[1] == '#')
- error ("Token splicing is not implemented yet.");
-
- /* Is this token an identifier? */
- if (tok.is_identifier)
- {
- int i;
-
- /* Is it the magic varargs parameter? */
- if (tok.len == 11
- && ! memcmp (tok.text, "__VA_ARGS__", 11))
- error ("Variable-arity macros not implemented yet.");
-
- /* Is it one of the parameters? */
- for (i = 0; i < def->argc; i++)
- if (tok.len == strlen (def->argv[i])
- && ! memcmp (tok.text, def->argv[i], tok.len))
- {
- struct macro_buffer arg_src;
-
- /* Expand any macro invocations in the argument text,
- and append the result to dest. Remember that scan
- mutates its source, so we need to scan a new buffer
- referring to the argument's text, not the argument
- itself. */
- init_shared_buffer (&arg_src, argv[i].text, argv[i].len);
- scan (dest, &arg_src, no_loop, lookup_func, lookup_baton);
- substituted = 1;
- break;
- }
- }
-
- /* If it wasn't a parameter, then just copy it across. */
- if (! substituted)
- append_tokens_without_splicing (dest, &tok);
+ else if (tok.len == 2
+ && tok.text[0] == '#'
+ && tok.text[1] == '#')
+ error (_("Stray splicing operator"));
+ /* Is the next token the splicing operator? */
+ else if (lookahead_valid
+ && lookahead.len == 2
+ && lookahead.text[0] == '#'
+ && lookahead.text[1] == '#')
+ {
+ int finished = 0;
+ int prev_was_comma = 0;
+
+ /* Note that GCC warns if the result of splicing is not a
+ token. In the debugger there doesn't seem to be much
+ benefit from doing this. */
+
+ /* Insert the first token. */
+ if (tok.len == 1 && tok.text[0] == ',')
+ prev_was_comma = 1;
+ else
+ {
+ int arg = find_parameter (&tok, is_varargs, va_arg_name,
+ def->argc, def->argv);
+
+ if (arg != -1)
+ dest->appendmem (argv[arg].text, argv[arg].len);
+ else
+ dest->appendmem (tok.text, tok.len);
+ }
+
+ /* Apply a possible sequence of ## operators. */
+ for (;;)
+ {
+ if (! get_token (&tok, &replacement_list))
+ error (_("Splicing operator at end of macro"));
+
+ /* Handle a comma before a ##. If we are handling
+ varargs, and the token on the right hand side is the
+ varargs marker, and the final argument is empty or
+ missing, then drop the comma. This is a GNU
+ extension. There is one ambiguous case here,
+ involving pedantic behavior with an empty argument,
+ but we settle that in favor of GNU-style (GCC uses an
+ option). If we aren't dealing with varargs, we
+ simply insert the comma. */
+ if (prev_was_comma)
+ {
+ if (! (is_varargs
+ && tok.len == va_arg_name->len
+ && !memcmp (tok.text, va_arg_name->text, tok.len)
+ && argv.back ().len == 0))
+ dest->appendmem (",", 1);
+ prev_was_comma = 0;
+ }
+
+ /* Insert the token. If it is a parameter, insert the
+ argument. If it is a comma, treat it specially. */
+ if (tok.len == 1 && tok.text[0] == ',')
+ prev_was_comma = 1;
+ else
+ {
+ int arg = find_parameter (&tok, is_varargs, va_arg_name,
+ def->argc, def->argv);
+
+ if (arg != -1)
+ dest->appendmem (argv[arg].text, argv[arg].len);
+ else
+ dest->appendmem (tok.text, tok.len);
+ }
+
+ /* Now read another token. If it is another splice, we
+ loop. */
+ original_rl_start = replacement_list.text;
+ if (! get_token (&tok, &replacement_list))
+ {
+ finished = 1;
+ break;
+ }
+
+ if (! (tok.len == 2
+ && tok.text[0] == '#'
+ && tok.text[1] == '#'))
+ break;
+ }
+
+ if (prev_was_comma)
+ {
+ /* We saw a comma. Insert it now. */
+ dest->appendmem (",", 1);
+ }
+
+ dest->last_token = dest->len;
+ if (finished)
+ lookahead_valid = 0;
+ else
+ {
+ /* Set up for the loop iterator. */
+ lookahead = tok;
+ lookahead_rl_start = original_rl_start;
+ lookahead_valid = 1;
+ }
+ }
+ else
+ {
+ /* Is this token an identifier? */
+ int substituted = 0;
+ int arg = find_parameter (&tok, is_varargs, va_arg_name,
+ def->argc, def->argv);
+
+ if (arg != -1)
+ {
+ /* Expand any macro invocations in the argument text,
+ and append the result to dest. Remember that scan
+ mutates its source, so we need to scan a new buffer
+ referring to the argument's text, not the argument
+ itself. */
+ shared_macro_buffer arg_src (argv[arg].text, argv[arg].len);
+ scan (dest, &arg_src, no_loop, scope);
+ substituted = 1;
+ }
+
+ /* If it wasn't a parameter, then just copy it across. */
+ if (! substituted)
+ append_tokens_without_splicing (dest, &tok);
+ }
}
+
+ if (vaopt_state > 0)
+ error (_("Unterminated __VA_OPT__"));
}
its expansion to DEST. SRC is the input text following the ID
token. We are currently rescanning the expansions of the macros
named in NO_LOOP; don't re-expand them. Use LOOKUP_FUNC and
- LOOKUP_BATON to find definitions for any nested macro references.
+ LOOKUP_BATON to find definitions for any nested macro references.
Return 1 if we decided to expand it, zero otherwise. (If it's a
function-like macro name that isn't followed by an argument list,
we don't expand it.) If we return zero, leave SRC unchanged. */
static int
expand (const char *id,
- struct macro_definition *def,
- struct macro_buffer *dest,
- struct macro_buffer *src,
- struct macro_name_list *no_loop,
- macro_lookup_ftype *lookup_func,
- void *lookup_baton)
+ struct macro_definition *def,
+ growable_macro_buffer *dest,
+ shared_macro_buffer *src,
+ struct macro_name_list *no_loop,
+ const macro_scope &scope)
{
struct macro_name_list new_no_loop;
/* What kind of macro are we expanding? */
if (def->kind == macro_object_like)
{
- struct macro_buffer replacement_list;
-
- init_shared_buffer (&replacement_list, (char *) def->replacement,
- strlen (def->replacement));
+ shared_macro_buffer replacement_list (def->replacement,
+ strlen (def->replacement));
- scan (dest, &replacement_list, &new_no_loop, lookup_func, lookup_baton);
+ scan (dest, &replacement_list, &new_no_loop, scope);
return 1;
}
else if (def->kind == macro_function_like)
{
- struct cleanup *back_to = make_cleanup (null_cleanup, 0);
- int argc;
- struct macro_buffer *argv = NULL;
- struct macro_buffer substituted;
- struct macro_buffer substituted_src;
-
- if (def->argc >= 1
- && strcmp (def->argv[def->argc - 1], "...") == 0)
- error ("Varargs macros not implemented yet.");
-
- make_cleanup (free_current_contents, &argv);
- argv = gather_arguments (id, src, &argc);
-
+ shared_macro_buffer va_arg_name;
+ int is_varargs = 0;
+
+ if (def->argc >= 1)
+ {
+ if (strcmp (def->argv[def->argc - 1], "...") == 0)
+ {
+ /* In C99-style varargs, substitution is done using
+ __VA_ARGS__. */
+ va_arg_name.set_shared ("__VA_ARGS__", strlen ("__VA_ARGS__"));
+ is_varargs = 1;
+ }
+ else
+ {
+ int len = strlen (def->argv[def->argc - 1]);
+
+ if (len > 3
+ && strcmp (def->argv[def->argc - 1] + len - 3, "...") == 0)
+ {
+ /* In GNU-style varargs, the name of the
+ substitution parameter is the name of the formal
+ argument without the "...". */
+ va_arg_name.set_shared (def->argv[def->argc - 1], len - 3);
+ is_varargs = 1;
+ }
+ }
+ }
+
+ std::vector<shared_macro_buffer> argv;
/* If we couldn't find any argument list, then we don't expand
- this macro. */
- if (! argv)
- {
- do_cleanups (back_to);
- return 0;
- }
+ this macro. */
+ if (!gather_arguments (id, src, is_varargs ? def->argc : -1,
+ &argv))
+ return 0;
/* Check that we're passing an acceptable number of arguments for
- this macro. */
- if (argc != def->argc)
- {
- /* Remember that a sequence of tokens like "foo()" is a
- valid invocation of a macro expecting either zero or one
- arguments. */
- if (! (argc == 1
- && argv[0].len == 0
- && def->argc == 0))
- error ("Wrong number of arguments to macro `%s' "
- "(expected %d, got %d).",
- id, def->argc, argc);
- }
+ this macro. */
+ if (argv.size () != def->argc)
+ {
+ if (is_varargs && argv.size () >= def->argc - 1)
+ {
+ /* Ok. */
+ }
+ /* Remember that a sequence of tokens like "foo()" is a
+ valid invocation of a macro expecting either zero or one
+ arguments. */
+ else if (! (argv.size () == 1
+ && argv[0].len == 0
+ && def->argc == 0))
+ error (_("Wrong number of arguments to macro `%s' "
+ "(expected %d, got %d)."),
+ id, def->argc, int (argv.size ()));
+ }
/* Note that we don't expand macro invocations in the arguments
- yet --- we let subst_args take care of that. Parameters that
- appear as operands of the stringifying operator "#" or the
- splicing operator "##" don't get macro references expanded,
- so we can't really tell whether it's appropriate to macro-
- expand an argument until we see how it's being used. */
- init_buffer (&substituted, 0);
- make_cleanup (cleanup_macro_buffer, &substituted);
- substitute_args (&substituted, def, argc, argv, no_loop,
- lookup_func, lookup_baton);
+ yet --- we let subst_args take care of that. Parameters that
+ appear as operands of the stringifying operator "#" or the
+ splicing operator "##" don't get macro references expanded,
+ so we can't really tell whether it's appropriate to macro-
+ expand an argument until we see how it's being used. */
+ growable_macro_buffer substituted (0);
+ substitute_args (&substituted, def, is_varargs, &va_arg_name,
+ argv, no_loop, scope);
/* Now `substituted' is the macro's replacement list, with all
- argument values substituted into it properly. Re-scan it for
- macro references, but don't expand invocations of this macro.
-
- We create a new buffer, `substituted_src', which points into
- `substituted', and scan that. We can't scan `substituted'
- itself, since the tokenization process moves the buffer's
- text pointer around, and we still need to be able to find
- `substituted's original text buffer after scanning it so we
- can free it. */
- init_shared_buffer (&substituted_src, substituted.text, substituted.len);
- scan (dest, &substituted_src, &new_no_loop, lookup_func, lookup_baton);
-
- do_cleanups (back_to);
+ argument values substituted into it properly. Re-scan it for
+ macro references, but don't expand invocations of this macro.
+
+ We create a new buffer, `substituted_src', which points into
+ `substituted', and scan that. We can't scan `substituted'
+ itself, since the tokenization process moves the buffer's
+ text pointer around, and we still need to be able to find
+ `substituted's original text buffer after scanning it so we
+ can free it. */
+ shared_macro_buffer substituted_src (substituted.text, substituted.len);
+ scan (dest, &substituted_src, &new_no_loop, scope);
return 1;
}
else
- internal_error (__FILE__, __LINE__, "bad macro definition kind");
+ internal_error (_("bad macro definition kind"));
}
/* If the single token in SRC_FIRST followed by the tokens in SRC_REST
- constitute a macro invokation not forbidden in NO_LOOP, append its
+ constitute a macro invocation not forbidden in NO_LOOP, append its
expansion to DEST and return non-zero. Otherwise, return zero, and
leave DEST unchanged.
- SRC_FIRST and SRC_REST must be shared buffers; DEST must not be one.
SRC_FIRST must be a string built by get_token. */
static int
-maybe_expand (struct macro_buffer *dest,
- struct macro_buffer *src_first,
- struct macro_buffer *src_rest,
- struct macro_name_list *no_loop,
- macro_lookup_ftype *lookup_func,
- void *lookup_baton)
+maybe_expand (growable_macro_buffer *dest,
+ shared_macro_buffer *src_first,
+ shared_macro_buffer *src_rest,
+ struct macro_name_list *no_loop,
+ const macro_scope &scope)
{
- gdb_assert (src_first->shared);
- gdb_assert (src_rest->shared);
- gdb_assert (! dest->shared);
-
/* Is this token an identifier? */
if (src_first->is_identifier)
{
/* Make a null-terminated copy of it, since that's what our
- lookup function expects. */
- char *id = xmalloc (src_first->len + 1);
- struct cleanup *back_to = make_cleanup (xfree, id);
- memcpy (id, src_first->text, src_first->len);
- id[src_first->len] = 0;
-
+ lookup function expects. */
+ std::string id (src_first->text, src_first->len);
+
/* If we're currently re-scanning the result of expanding
- this macro, don't expand it again. */
- if (! currently_rescanning (no_loop, id))
- {
- /* Does this identifier have a macro definition in scope? */
- struct macro_definition *def = lookup_func (id, lookup_baton);
-
- if (def && expand (id, def, dest, src_rest, no_loop,
- lookup_func, lookup_baton))
- {
- do_cleanups (back_to);
- return 1;
- }
- }
-
- do_cleanups (back_to);
+ this macro, don't expand it again. */
+ if (! currently_rescanning (no_loop, id.c_str ()))
+ {
+ /* Does this identifier have a macro definition in scope? */
+ macro_definition *def = standard_macro_lookup (id.c_str (), scope);
+
+ if (def && expand (id.c_str (), def, dest, src_rest, no_loop, scope))
+ return 1;
+ }
}
return 0;
/* Expand macro references in SRC, appending the results to DEST.
Assume we are re-scanning the result of expanding the macros named
- in NO_LOOP, and don't try to re-expand references to them.
+ in NO_LOOP, and don't try to re-expand references to them. */
- SRC must be a shared buffer; DEST must not be one. */
static void
-scan (struct macro_buffer *dest,
- struct macro_buffer *src,
+scan (growable_macro_buffer *dest,
+ shared_macro_buffer *src,
struct macro_name_list *no_loop,
- macro_lookup_ftype *lookup_func,
- void *lookup_baton)
+ const macro_scope &scope)
{
- gdb_assert (src->shared);
- gdb_assert (! dest->shared);
for (;;)
{
- struct macro_buffer tok;
- char *original_src_start = src->text;
+ shared_macro_buffer tok;
+ const char *original_src_start = src->text;
/* Find the next token in SRC. */
if (! get_token (&tok, src))
- break;
+ break;
/* Just for aesthetics. If we skipped some whitespace, copy
- that to DEST. */
+ that to DEST. */
if (tok.text > original_src_start)
- {
- appendmem (dest, original_src_start, tok.text - original_src_start);
- dest->last_token = dest->len;
- }
-
- if (! maybe_expand (dest, &tok, src, no_loop, lookup_func, lookup_baton))
- /* We didn't end up expanding tok as a macro reference, so
- simply append it to dest. */
- append_tokens_without_splicing (dest, &tok);
+ {
+ dest->appendmem (original_src_start, tok.text - original_src_start);
+ dest->last_token = dest->len;
+ }
+
+ if (! maybe_expand (dest, &tok, src, no_loop, scope))
+ /* We didn't end up expanding tok as a macro reference, so
+ simply append it to dest. */
+ append_tokens_without_splicing (dest, &tok);
}
/* Just for aesthetics. If there was any trailing whitespace in
src, copy it to dest. */
if (src->len)
{
- appendmem (dest, src->text, src->len);
+ dest->appendmem (src->text, src->len);
dest->last_token = dest->len;
}
}
-char *
-macro_expand (const char *source,
- macro_lookup_ftype *lookup_func,
- void *lookup_func_baton)
+gdb::unique_xmalloc_ptr<char>
+macro_expand (const char *source, const macro_scope &scope)
{
- struct macro_buffer src, dest;
- struct cleanup *back_to;
-
- init_shared_buffer (&src, (char *) source, strlen (source));
+ shared_macro_buffer src (source, strlen (source));
- init_buffer (&dest, 0);
+ growable_macro_buffer dest (0);
dest.last_token = 0;
- back_to = make_cleanup (cleanup_macro_buffer, &dest);
- scan (&dest, &src, 0, lookup_func, lookup_func_baton);
+ scan (&dest, &src, 0, scope);
- appendc (&dest, '\0');
+ dest.appendc ('\0');
- discard_cleanups (back_to);
- return dest.text;
+ return dest.release ();
}
-char *
-macro_expand_once (const char *source,
- macro_lookup_ftype *lookup_func,
- void *lookup_func_baton)
+gdb::unique_xmalloc_ptr<char>
+macro_expand_once (const char *source, const macro_scope &scope)
{
- error ("Expand-once not implemented yet.");
+ error (_("Expand-once not implemented yet."));
}
-
-char *
-macro_expand_next (char **lexptr,
- macro_lookup_ftype *lookup_func,
- void *lookup_baton)
+gdb::unique_xmalloc_ptr<char>
+macro_expand_next (const char **lexptr, const macro_scope &scope)
{
- struct macro_buffer src, dest, tok;
- struct cleanup *back_to;
+ shared_macro_buffer tok;
/* Set up SRC to refer to the input text, pointed to by *lexptr. */
- init_shared_buffer (&src, *lexptr, strlen (*lexptr));
+ shared_macro_buffer src (*lexptr, strlen (*lexptr));
/* Set up DEST to receive the expansion, if there is one. */
- init_buffer (&dest, 0);
+ growable_macro_buffer dest (0);
dest.last_token = 0;
- back_to = make_cleanup (cleanup_macro_buffer, &dest);
/* Get the text's first preprocessing token. */
if (! get_token (&tok, &src))
- {
- do_cleanups (back_to);
- return 0;
- }
+ return nullptr;
/* If it's a macro invocation, expand it. */
- if (maybe_expand (&dest, &tok, &src, 0, lookup_func, lookup_baton))
+ if (maybe_expand (&dest, &tok, &src, 0, scope))
{
/* It was a macro invocation! Package up the expansion as a
- null-terminated string and return it. Set *lexptr to the
- start of the next token in the input. */
- appendc (&dest, '\0');
- discard_cleanups (back_to);
+ null-terminated string and return it. Set *lexptr to the
+ start of the next token in the input. */
+ dest.appendc ('\0');
*lexptr = src.text;
- return dest.text;
+ return dest.release ();
}
else
{
/* It wasn't a macro invocation. */
- do_cleanups (back_to);
- return 0;
+ return nullptr;
}
}
projects / binutils-gdb.git / blobdiff