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[PATCH] #assert becomes macro-like

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https://gcc.gnu.org/ml/gcc-patches/2018-08/msg01140.html
	libcpp/
	* include/cpp-id-data.h (struct answer): Delete.
	* include/cpplib.h (struct answer): Don't forward-declare.
	(enum cpp_macro_kind): Add cmk_assert.
	(struct cpp_macro): Union parms and next assert chain.
	(union _cpp_hashnode_value): 'answer' field is cpp_macro.
	* directives.c (parse_answer): Convert to use cpp_macro. Return
	true on success. 
	(parse_assertion, find_answer, _cpp_test_assertion, cpp_do_assert)
	(cpp_do_unassert): Convert to use cpp_macro.
	* macro.c (warn_of_redefinition, _cpp_new_macro)
	(check_trad_stringification, cpp_macro_definition): Adjust macro
	parm access.
	* traditional.c (_cpp_replacement_text_len)
	(_cpp_copy_replacement_text, _cpp_create_trad_definition): Likewise.
	gcc/c-family/
	* c-ada-spec.c (macro_length, dump_ada_macros): Adjust macro parm
	access.

From-SVN: r263658
This commit is contained in:
Nathan Sidwell 2018-08-20 12:39:36 +00:00 committed by Nathan Sidwell
parent b655b8fc7e
commit 3fb558b154
8 changed files with 129 additions and 125 deletions
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5
gcc/c-family/ChangeLog
View File

@ -1,3 +1,8 @@
2018-08-20 Nathan Sidwell <nathan@acm.org>
* c-ada-spec.c (macro_length, dump_ada_macros): Adjust macro parm
access.
2018-08-17 Nathan Sidwell <nathan@acm.org>
* c-cppbuiltin.c (struct lazy_hex_fp_value_struct): Remove macro

8
gcc/c-family/c-ada-spec.c
View File

@ -69,7 +69,7 @@ macro_length (const cpp_macro *macro, int *supported, int *buffer_len,
(*param_len)++;
for (i = 0; i < macro->paramc; i++)
{
cpp_hashnode *param = macro->params[i];
cpp_hashnode *param = macro->parm.params[i];
*param_len += NODE_LEN (param);
@ -101,7 +101,7 @@ macro_length (const cpp_macro *macro, int *supported, int *buffer_len,
if (token->type == CPP_MACRO_ARG)
*buffer_len +=
NODE_LEN (macro->params[token->val.macro_arg.arg_no - 1]);
NODE_LEN (macro->parm.params[token->val.macro_arg.arg_no - 1]);
else
/* Include enough extra space to handle e.g. special characters. */
*buffer_len += (cpp_token_len (token) + 1) * 8;
@ -252,7 +252,7 @@ dump_ada_macros (pretty_printer *pp, const char* file)
*buf_param++ = '(';
for (i = 0; i < macro->paramc; i++)
{
cpp_hashnode *param = macro->params[i];
cpp_hashnode *param = macro->parm.params[i];
memcpy (buf_param, NODE_NAME (param), NODE_LEN (param));
buf_param += NODE_LEN (param);
@ -291,7 +291,7 @@ dump_ada_macros (pretty_printer *pp, const char* file)
case CPP_MACRO_ARG:
{
cpp_hashnode *param =
macro->params[token->val.macro_arg.arg_no - 1];
macro->parm.params[token->val.macro_arg.arg_no - 1];
memcpy (buffer, NODE_NAME (param), NODE_LEN (param));
buffer += NODE_LEN (param);
}

17
libcpp/ChangeLog
View File

@ -1,3 +1,20 @@
2018-08-20 Nathan Sidwell <nathan@acm.org>
* include/cpp-id-data.h (struct answer): Delete.
* include/cpplib.h (struct answer): Don't forward-declare.
(enum cpp_macro_kind): Add cmk_assert.
(struct cpp_macro): Union parms and next assert chain.
(union _cpp_hashnode_value): 'answer' field is cpp_macro.
* directives.c (parse_answer): Convert to use cpp_macro. Return
true on success.
(parse_assertion, find_answer, _cpp_test_assertion, cpp_do_assert)
(cpp_do_unassert): Convert to use cpp_macro.
* macro.c (warn_of_redefinition, _cpp_new_macro)
(check_trad_stringification, cpp_macro_definition): Adjust macro
parm access.
* traditional.c (_cpp_replacement_text_len)
(_cpp_copy_replacement_text, _cpp_create_trad_definition): Likewise.
2018-08-17 Nathan Sidwell <nathan@acm.org>
* include/cpplib.h (struct cpp_callbacks): Replace

170
libcpp/directives.c
View File

@ -124,9 +124,9 @@ static const cpp_token *get_token_no_padding (cpp_reader *);
static const cpp_token *get__Pragma_string (cpp_reader *);
static void destringize_and_run (cpp_reader *, const cpp_string *,
source_location);
static int parse_answer (cpp_reader *, struct answer **, int, source_location);
static cpp_hashnode *parse_assertion (cpp_reader *, struct answer **, int);
static struct answer ** find_answer (cpp_hashnode *, const struct answer *);
static bool parse_answer (cpp_reader *, int, source_location, cpp_macro **);
static cpp_hashnode *parse_assertion (cpp_reader *, int, cpp_macro **);
static cpp_macro **find_answer (cpp_hashnode *, const cpp_macro *);
static void handle_assertion (cpp_reader *, const char *, int);
static void do_pragma_push_macro (cpp_reader *);
static void do_pragma_pop_macro (cpp_reader *);
@ -2149,17 +2149,13 @@ push_conditional (cpp_reader *pfile, int skip, int type,
storage, i.e. the #assert case. Returns 0 on success, and sets
ANSWERP to point to the answer. PRED_LOC is the location of the
predicate. */
static int
parse_answer (cpp_reader *pfile, struct answer **answerp, int type,
source_location pred_loc)
static bool
parse_answer (cpp_reader *pfile, int type, source_location pred_loc,
cpp_macro **answer_ptr)
{
const cpp_token *paren;
struct answer *answer;
unsigned int acount;
/* In a conditional, it is legal to not have an open paren. We
should save the following token in this case. */
paren = cpp_get_token (pfile);
const cpp_token *paren = cpp_get_token (pfile);
/* If not a paren, see if we're OK. */
if (paren->type != CPP_OPEN_PAREN)
@ -2169,23 +2165,26 @@ parse_answer (cpp_reader *pfile, struct answer **answerp, int type,
if (type == T_IF)
{
_cpp_backup_tokens (pfile, 1);
return 0;
return true;
}
/* #unassert with no answer is valid - it removes all answers. */
if (type == T_UNASSERT && paren->type == CPP_EOF)
return 0;
return true;
cpp_error_with_line (pfile, CPP_DL_ERROR, pred_loc, 0,
"missing '(' after predicate");
return 1;
return false;
}
for (acount = 0;; acount++)
cpp_macro *answer = _cpp_new_macro (pfile, cmk_assert,
_cpp_reserve_room (pfile, 0,
sizeof (cpp_macro)));
answer->parm.next = NULL;
unsigned count = 0;
for (;;)
{
size_t room_needed;
const cpp_token *token = cpp_get_token (pfile);
cpp_token *dest;
if (token->type == CPP_CLOSE_PAREN)
break;
@ -2193,57 +2192,51 @@ parse_answer (cpp_reader *pfile, struct answer **answerp, int type,
if (token->type == CPP_EOF)
{
cpp_error (pfile, CPP_DL_ERROR, "missing ')' to complete answer");
return 1;
return false;
}
/* struct answer includes the space for one token. */
room_needed = (sizeof (struct answer) + acount * sizeof (cpp_token));
if (BUFF_ROOM (pfile->a_buff) < room_needed)
_cpp_extend_buff (pfile, &pfile->a_buff, sizeof (struct answer));
dest = &((struct answer *) BUFF_FRONT (pfile->a_buff))->first[acount];
*dest = *token;
/* Drop whitespace at start, for answer equivalence purposes. */
if (acount == 0)
dest->flags &= ~PREV_WHITE;
answer = (cpp_macro *)_cpp_reserve_room
(pfile, sizeof (cpp_macro) + count * sizeof (cpp_token),
sizeof (cpp_token));
answer->exp.tokens[count++] = *token;
}
if (acount == 0)
if (!count)
{
cpp_error (pfile, CPP_DL_ERROR, "predicate's answer is empty");
return 1;
return false;
}
answer = (struct answer *) BUFF_FRONT (pfile->a_buff);
answer->count = acount;
answer->next = NULL;
*answerp = answer;
/* Drop whitespace at start, for answer equivalence purposes. */
answer->exp.tokens[0].flags &= ~PREV_WHITE;
return 0;
answer->count = count;
*answer_ptr = answer;
return true;
}
/* Parses an assertion directive of type TYPE, returning a pointer to
the hash node of the predicate, or 0 on error. If an answer was
supplied, it is placed in ANSWERP, otherwise it is set to 0. */
supplied, it is placed in EXP_PTR & EXP_COUNT, which is otherwise
set to 0. */
static cpp_hashnode *
parse_assertion (cpp_reader *pfile, struct answer **answerp, int type)
parse_assertion (cpp_reader *pfile, int type, cpp_macro **answer_ptr)
{
cpp_hashnode *result = 0;
const cpp_token *predicate;
/* We don't expand predicates or answers. */
pfile->state.prevent_expansion++;
*answerp = 0;
predicate = cpp_get_token (pfile);
*answer_ptr = NULL;
const cpp_token *predicate = cpp_get_token (pfile);
if (predicate->type == CPP_EOF)
cpp_error (pfile, CPP_DL_ERROR, "assertion without predicate");
else if (predicate->type != CPP_NAME)
cpp_error_with_line (pfile, CPP_DL_ERROR, predicate->src_loc, 0,
"predicate must be an identifier");
else if (parse_answer (pfile, answerp, type, predicate->src_loc) == 0)
else if (parse_answer (pfile, type, predicate->src_loc, answer_ptr))
{
unsigned int len = NODE_LEN (predicate->val.node.node);
unsigned char *sym = (unsigned char *) alloca (len + 1);
@ -2255,25 +2248,27 @@ parse_assertion (cpp_reader *pfile, struct answer **answerp, int type)
}
pfile->state.prevent_expansion--;
return result;
}
/* Returns a pointer to the pointer to CANDIDATE in the answer chain,
or a pointer to NULL if the answer is not in the chain. */
static struct answer **
find_answer (cpp_hashnode *node, const struct answer *candidate)
static cpp_macro **
find_answer (cpp_hashnode *node, const cpp_macro *candidate)
{
unsigned int i;
struct answer **result;
cpp_macro **result = NULL;
for (result = &node->value.answers; *result; result = &(*result)->next)
for (result = &node->value.answers; *result; result = &(*result)->parm.next)
{
struct answer *answer = *result;
cpp_macro *answer = *result;
if (answer->count == candidate->count)
{
for (i = 0; i < answer->count; i++)
if (! _cpp_equiv_tokens (&answer->first[i], &candidate->first[i]))
if (!_cpp_equiv_tokens (&answer->exp.tokens[i],
&candidate->exp.tokens[i]))
break;
if (i == answer->count)
@ -2290,18 +2285,18 @@ find_answer (cpp_hashnode *node, const struct answer *candidate)
int
_cpp_test_assertion (cpp_reader *pfile, unsigned int *value)
{
struct answer *answer;
cpp_hashnode *node;
node = parse_assertion (pfile, &answer, T_IF);
cpp_macro *answer;
cpp_hashnode *node = parse_assertion (pfile, T_IF, &answer);
/* For recovery, an erroneous assertion expression is handled as a
failing assertion. */
*value = 0;
if (node)
*value = (node->type == NT_ASSERTION &&
(answer == 0 || *find_answer (node, answer) != 0));
{
if (node->type == NT_ASSERTION)
*value = !answer || *find_answer (node, answer);
}
else if (pfile->cur_token[-1].type == CPP_EOF)
_cpp_backup_tokens (pfile, 1);
@ -2313,43 +2308,31 @@ _cpp_test_assertion (cpp_reader *pfile, unsigned int *value)
static void
do_assert (cpp_reader *pfile)
{
struct answer *new_answer;
cpp_hashnode *node;
cpp_macro *answer;
cpp_hashnode *node = parse_assertion (pfile, T_ASSERT, &answer);
node = parse_assertion (pfile, &new_answer, T_ASSERT);
if (node)
{
size_t answer_size;
/* Place the new answer in the answer list. First check there
is not a duplicate. */
new_answer->next = 0;
if (node->type == NT_ASSERTION)
if (node->type == NT_ASSERTION && *find_answer (node, answer))
{
if (*find_answer (node, new_answer))
{
cpp_error (pfile, CPP_DL_WARNING, "\"%s\" re-asserted",
NODE_NAME (node) + 1);
return;
}
new_answer->next = node->value.answers;
cpp_error (pfile, CPP_DL_WARNING, "\"%s\" re-asserted",
NODE_NAME (node) + 1);
return;
}
answer_size = sizeof (struct answer) + ((new_answer->count - 1)
* sizeof (cpp_token));
/* Commit or allocate storage for the object. */
if (pfile->hash_table->alloc_subobject)
{
struct answer *temp_answer = new_answer;
new_answer = (struct answer *) pfile->hash_table->alloc_subobject
(answer_size);
memcpy (new_answer, temp_answer, answer_size);
}
else
BUFF_FRONT (pfile->a_buff) += answer_size;
/* Commit or allocate storage for the answer. */
answer = (cpp_macro *)_cpp_commit_buff
(pfile, sizeof (cpp_macro) - sizeof (cpp_token)
+ sizeof (cpp_token) * answer->count);
if (node->type == NT_ASSERTION)
answer->parm.next = node->value.answers;
node->type = NT_ASSERTION;
node->value.answers = new_answer;
node->value.answers = answer;
check_eol (pfile, false);
}
}
@ -2358,25 +2341,24 @@ do_assert (cpp_reader *pfile)
static void
do_unassert (cpp_reader *pfile)
{
cpp_hashnode *node;
struct answer *answer;
cpp_macro *answer;
cpp_hashnode *node = parse_assertion (pfile, T_UNASSERT, &answer);
node = parse_assertion (pfile, &answer, T_UNASSERT);
/* It isn't an error to #unassert something that isn't asserted. */
if (node && node->type == NT_ASSERTION)
{
if (answer)
{
struct answer **p = find_answer (node, answer), *temp;
cpp_macro **p = find_answer (node, answer);
/* Remove the answer from the list. */
temp = *p;
if (temp)
*p = temp->next;
/* Did we free the last answer? */
if (node->value.answers == 0)
node->type = NT_VOID;
/* Remove the assert from the list. */
if (cpp_macro *temp = *p)
{
*p = temp->parm.next;
/* Did we free the last answer? */
if (!*p)
node->type = NT_VOID;
}
check_eol (pfile, false);
}

7
libcpp/include/cpp-id-data.h
View File

@ -17,10 +17,3 @@ along with this program; see the file COPYING3. If not see
#include "cpplib.h"
/* Chained list of answers to an assertion. */
struct GTY(()) answer {
struct answer *next;
unsigned int count;
cpp_token GTY ((length ("%h.count"))) first[1];
};

29
libcpp/include/cpplib.h
View File

@ -36,7 +36,6 @@ typedef struct cpp_macro cpp_macro;
typedef struct cpp_callbacks cpp_callbacks;
typedef struct cpp_dir cpp_dir;
struct answer;
struct _cpp_file;
/* The first three groups, apart from '=', can appear in preprocessor
@ -674,25 +673,33 @@ struct cpp_dir
/* The kind of the cpp_macro. */
enum cpp_macro_kind {
cmk_macro, /* An ISO macro (token expansion). */
cmk_assert, /* An assertion. */
cmk_traditional, /* A traditional macro (text expansion). */
};
/* Each macro definition is recorded in a cpp_macro structure.
Variadic macros cannot occur with traditional cpp. */
struct GTY(()) cpp_macro {
/* Parameters, if any. If parameter names use extended identifiers,
the original spelling of those identifiers, not the canonical
UTF-8 spelling, goes here. */
cpp_hashnode ** GTY ((nested_ptr (union tree_node,
"%h ? CPP_HASHNODE (GCC_IDENT_TO_HT_IDENT (%h)) : NULL",
"%h ? HT_IDENT_TO_GCC_IDENT (HT_NODE (%h)) : NULL"),
length ("%h.paramc")))
params;
union cpp_parm_u
{
/* Parameters, if any. If parameter names use extended identifiers,
the original spelling of those identifiers, not the canonical
UTF-8 spelling, goes here. */
cpp_hashnode ** GTY ((tag ("false"),
nested_ptr (union tree_node,
"%h ? CPP_HASHNODE (GCC_IDENT_TO_HT_IDENT (%h)) : NULL",
"%h ? HT_IDENT_TO_GCC_IDENT (HT_NODE (%h)) : NULL"),
length ("%1.paramc"))) params;
/* If this is an assertion, the next one in the chain. */
cpp_macro *GTY ((tag ("true"))) next;
} GTY ((desc ("%1.kind == cmk_assert"))) parm;
/* Definition line number. */
source_location line;
/* Number of tokens in expansion, or bytes for traditional macros. */
/* Number of tokens in body, or bytes for traditional macros. */
/* Do we really need 2^32-1 range here? */
unsigned int count;
/* Number of parameters. */
@ -814,7 +821,7 @@ union GTY(()) _cpp_hashnode_value {
/* If a macro. */
cpp_macro * GTY((tag ("NTV_MACRO"))) macro;
/* Answers to an assertion. */
struct answer * GTY ((tag ("NTV_ANSWER"))) answers;
cpp_macro * GTY ((tag ("NTV_ANSWER"))) answers;
/* Code for a builtin macro. */
enum cpp_builtin_type GTY ((tag ("NTV_BUILTIN"))) builtin;
/* Macro argument index. */

12
libcpp/macro.c
View File

@ -3017,7 +3017,7 @@ warn_of_redefinition (cpp_reader *pfile, cpp_hashnode *node,
/* Check parameter spellings. */
for (i = 0; i < macro1->paramc; i++)
if (macro1->params[i] != macro2->params[i])
if (macro1->parm.params[i] != macro2->parm.params[i])
return true;
/* Check the replacement text or tokens. */
@ -3326,7 +3326,7 @@ create_iso_definition (cpp_reader *pfile)
{
macro->variadic = varadic;
macro->paramc = nparms;
macro->params = params;
macro->parm.params = params;
macro->fun_like = true;
}
else
@ -3472,7 +3472,7 @@ _cpp_new_macro (cpp_reader *pfile, cpp_macro_kind kind, void *placement)
cpp_macro *macro = (cpp_macro *) placement;
macro->line = pfile->directive_line;
macro->params = 0;
macro->parm.params = 0;
macro->lazy = 0;
macro->paramc = 0;
macro->variadic = 0;
@ -3618,7 +3618,7 @@ check_trad_stringification (cpp_reader *pfile, const cpp_macro *macro,
identifier inside the string matches one of them. */
for (i = 0; i < macro->paramc; i++)
{
const cpp_hashnode *node = macro->params[i];
const cpp_hashnode *node = macro->parm.params[i];
if (NODE_LEN (node) == len
&& !memcmp (p, NODE_NAME (node), len))
@ -3663,7 +3663,7 @@ cpp_macro_definition (cpp_reader *pfile, cpp_hashnode *node)
len += 4; /* "()" plus possible final ".." of named
varargs (we have + 1 below). */
for (i = 0; i < macro->paramc; i++)
len += NODE_LEN (macro->params[i]) + 1; /* "," */
len += NODE_LEN (macro->parm.params[i]) + 1; /* "," */
}
/* This should match below where we fill in the buffer. */
@ -3707,7 +3707,7 @@ cpp_macro_definition (cpp_reader *pfile, cpp_hashnode *node)
*buffer++ = '(';
for (i = 0; i < macro->paramc; i++)
{
cpp_hashnode *param = macro->params[i];
cpp_hashnode *param = macro->parm.params[i];
if (param != pfile->spec_nodes.n__VA_ARGS__)
{

6
libcpp/traditional.c
View File

@ -918,7 +918,7 @@ _cpp_replacement_text_len (const cpp_macro *macro)
len += b->text_len;
if (b->arg_index == 0)
break;
len += NODE_LEN (macro->params[b->arg_index - 1]);
len += NODE_LEN (macro->parm.params[b->arg_index - 1]);
exp += BLOCK_LEN (b->text_len);
}
}
@ -947,7 +947,7 @@ _cpp_copy_replacement_text (const cpp_macro *macro, uchar *dest)
dest += b->text_len;
if (b->arg_index == 0)
break;
param = macro->params[b->arg_index - 1];
param = macro->parm.params[b->arg_index - 1];
memcpy (dest, NODE_NAME (param), NODE_LEN (param));
dest += NODE_LEN (param);
exp += BLOCK_LEN (b->text_len);
@ -1210,7 +1210,7 @@ _cpp_create_trad_definition (cpp_reader *pfile)
{
macro = _cpp_new_macro (pfile, cmk_traditional,
_cpp_aligned_alloc (pfile, sizeof (cpp_macro)));
macro->params = params;
macro->parm.params = params;
macro->paramc = nparms;
macro->fun_like = fun_like != 0;
}