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authorRichard Henderson <rth@redhat.com>2007-03-30 14:12:53 -0700
committerRichard Henderson <rth@gcc.gnu.org>2007-03-30 14:12:53 -0700
commit121de39fc0ebadfbf9ef9f1721aa3cac42ac92e1 (patch)
treef8ad58ad599c110a4cb386319a9c1e0f7f184b64 /libcpp/directives.c
parent6c7ac15dc63e3435b7cec32baa37e48d86c381e3 (diff)
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directives.c (lex_macro_node_from_str): New.
libcpp/ * directives.c (lex_macro_node_from_str): New. (cpp_push_definition, cpp_pop_definition): New. * include/cpplib.h (cpp_push_definition, cpp_pop_definition): Declare. gcc/ * c-pragma.c (struct def_pragma_macro_value): New. (struct def_pragma_macro): New. (pushed_macro_table): New. (dpm_hash, dpm_eq): New. (handle_pragma_push_macro, handle_pragma_pop_macro): New. (init_pragma): Install them. * doc/tm.texi (HANDLE_PRAGMA_PUSH_POP_MACRO): New. Co-Authored-By: Kai Tietz <kai.tietz@onevision.com> From-SVN: r123370
Diffstat (limited to 'libcpp/directives.c')
-rw-r--r--libcpp/directives.c59
1 files changed, 59 insertions, 0 deletions
diff --git a/libcpp/directives.c b/libcpp/directives.c
index d67cb5f..d9cf9d2 100644
--- a/libcpp/directives.c
+++ b/libcpp/directives.c
@@ -2078,6 +2078,65 @@ cpp_undef (cpp_reader *pfile, const char *macro)
run_directive (pfile, T_UNDEF, buf, len);
}
+/* Like lex_macro_node, but read the input from STR. */
+static cpp_hashnode *
+lex_macro_node_from_str (cpp_reader *pfile, const char *str)
+{
+ size_t len = strlen (str);
+ uchar *buf = (char *) alloca (len + 1);
+ cpp_hashnode *node;
+
+ memcpy (buf, str, len);
+ buf[len] = '\n';
+ cpp_push_buffer (pfile, buf, len, true);
+ node = lex_macro_node (pfile, true);
+ _cpp_pop_buffer (pfile);
+
+ return node;
+}
+
+/* If STR is a defined macro, return its definition node, else return NULL. */
+cpp_macro *
+cpp_push_definition (cpp_reader *pfile, const char *str)
+{
+ cpp_hashnode *node = lex_macro_node_from_str (pfile, str);
+ if (node && node->type == NT_MACRO)
+ return node->value.macro;
+ else
+ return NULL;
+}
+
+/* Replace a previous definition DFN of the macro STR. If DFN is NULL,
+ then the macro should be undefined. */
+void
+cpp_pop_definition (cpp_reader *pfile, const char *str, cpp_macro *dfn)
+{
+ cpp_hashnode *node = lex_macro_node_from_str (pfile, str);
+ if (node == NULL)
+ return;
+
+ if (node->type == NT_MACRO)
+ {
+ if (pfile->cb.undef)
+ pfile->cb.undef (pfile, pfile->directive_line, node);
+ if (CPP_OPTION (pfile, warn_unused_macros))
+ _cpp_warn_if_unused_macro (pfile, node, NULL);
+ }
+ if (node->type != NT_VOID)
+ _cpp_free_definition (node);
+
+ if (dfn)
+ {
+ node->type = NT_MACRO;
+ node->value.macro = dfn;
+ if (! ustrncmp (NODE_NAME (node), DSC ("__STDC_")))
+ node->flags |= NODE_WARN;
+
+ if (pfile->cb.define)
+ pfile->cb.define (pfile, pfile->directive_line, node);
+ }
+}
+
/* Process the string STR as if it appeared as the body of a #assert. */
void
cpp_assert (cpp_reader *pfile, const char *str)