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fix the bug #31403: parser bug in structure

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- a warning: unnamed struct/union that defines no instances
    - allow a nested named struct declaration w/o identifier
      only when option -fms-extensions is used
This commit is contained in:
seyko 2015-04-10 06:31:58 +03:00
parent 9fc3d66f1b
commit dec959358a
4 changed files with 23 additions and 3 deletions
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1
libtcc.c
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@ -1463,6 +1463,7 @@ static const FlagDef flag_defs[] = {
{ offsetof(TCCState, char_is_unsigned), FD_INVERT, "signed-char" },
{ offsetof(TCCState, nocommon), FD_INVERT, "common" },
{ offsetof(TCCState, leading_underscore), 0, "leading-underscore" },
{ offsetof(TCCState, ms_extensions), 0, "ms-extensions" },
};
/* set/reset a flag */

5
tcc-doc.texi
View file

@ -236,6 +236,11 @@ Do not generate common symbols for uninitialized data.
@item -fleading-underscore
Add a leading underscore at the beginning of each C symbol.
@item -fms-extensions
Allow a MS C compiler extensions to the language. Curretly this
assume a nested named structure declaration without identifier behave
like an unnamed one.
@end table
Warning options:

1
tcc.h
View file

@ -602,6 +602,7 @@ struct TCCState {
/* C language options */
int char_is_unsigned;
int leading_underscore;
int ms_extensions; /* allow nested named struct w/o identifier behave like unnamed */
/* warning switches */
int warn_write_strings;

17
tccgen.c
View file

@ -2959,8 +2959,17 @@ static void struct_decl(CType *type, int u, int tdef)
type1 = btype;
if (tok != ':') {
type_decl(&type1, &ad, &v, TYPE_DIRECT | TYPE_ABSTRACT);
if (v == 0 && (type1.t & VT_BTYPE) != VT_STRUCT)
if (v == 0) {
if ((type1.t & VT_BTYPE) != VT_STRUCT)
expect("identifier");
else {
int v = btype.ref->v;
if (!(v & SYM_FIELD) && (v & ~SYM_STRUCT) < SYM_FIRST_ANOM) {
if (tcc_state->ms_extensions == 0)
expect("identifier");
}
}
}
if (type_size(&type1, &align) < 0) {
if ((a == TOK_STRUCT) && (type1.t & VT_ARRAY) && c)
flexible = 1;
@ -6121,7 +6130,11 @@ static int decl0(int l, int is_for_loop_init)
if (((btype.t & VT_BTYPE) == VT_ENUM ||
(btype.t & VT_BTYPE) == VT_STRUCT) &&
tok == ';') {
/* we accept no variable after */
if ((btype.t & VT_BTYPE) == VT_STRUCT) {
int v = btype.ref->v;
if (!(v & SYM_FIELD) && (v & ~SYM_STRUCT) >= SYM_FIRST_ANOM)
tcc_warning("unnamed struct/union that defines no instances");
}
next();
continue;
}