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Date: Thu, 14 May 2015 19:34:46 +0300
Message-ID: <CAA2C=vAUa61rumTN9fyCDdtdGXzqfzZLdtz4Nw+8gWX-J-x0bg@mail.gmail.com>
Subject: Re: bad pragma in dir.h? (and our structrure packing)
From: "Ozkan Sezer (sezeroz AT gmail DOT com)" <djgpp AT delorie DOT com>
To: djgpp AT delorie DOT com
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On 5/14/15, Eli Zaretskii (eliz AT gnu DOT org) <djgpp AT delorie DOT com> wrote:
>> Date: Wed, 13 May 2015 23:27:39 +0300
>> From: "Ozkan Sezer (sezeroz AT gmail DOT com)" <djgpp AT delorie DOT com>
>>
>> > If you (or someone else) can verify that the size of the structure and
>> > the offsets of each member are the same in both C and C++ programs,
>> > then I see no reason to keep the attribute on every member.
>>
>> I did the following as a foo.c and foo.cc:
>>
>> #define COMPILE_TIME_ASSERT(name, x) \
>>   typedef int _djchk_ ## name[(x) * 2 - 1]
>>
>> #include "dos.h"
>> COMPILE_TIME_ASSERT(find_t,sizeof(struct _find_t)==286);
>>
>> #include "dir.h"
>> COMPILE_TIME_ASSERT(ffblk,sizeof(struct ffblk)==290);
>> COMPILE_TIME_ASSERT(ffblklfn,sizeof(struct ffblklfn)==318);
>>
>> #include "coff.h"
>> COMPILE_TIME_ASSERT(exln,sizeof(struct external_lineno)==6);
>> COMPILE_TIME_ASSERT(exse,sizeof(struct external_syment)==18);
>> COMPILE_TIME_ASSERT(exau,sizeof(union external_auxent)==18);
>> COMPILE_TIME_ASSERT(exrl,sizeof(struct external_reloc)==10);
>>
>> Compiled using existing and modified headers for djgpp using gcc/g++
>> v3.4.6 and 5.1.0, no errors.  I also compiled its coff.h-only parts
>> for linux (i686 gcc-4.3.0 and clang-3.4.2), osx (ppc gcc-4.0.1 and
>> x86_64 gcc-4.2.1), mingw (gcc-3.4.5), mingw-w64 (x86_64 gcc-4.5.4):
>> no errors.
>>
>> Diff for the modified headers is attached (1.patch)
>> Ideas?
>
> LGTM, thanks.
>

OK, fixed the broken pragma in dir.h as of r1.7.

Moved the packed attributes from members to structures as
of dir.h r1.8, dos.h r1.16 and coff.h r1.8.


>> On 5/13/15, Andris Pavenis (andris DOT pavenis AT iki DOT fi) <djgpp AT delorie DOT com>
>> wrote:
>> > I guess it would be a good idea to have small test in build process to
>> > verify that offsets of
>> > members are correct for structures intended for DOS calls. So build
>> > would
>> > fail if something is
>> > wrong with member packing
>> >
>> > Andris
>>
>> We can add compile-time asserts like the above to the headers: ideas?
>
> I think a test in djtst would be better.
>
> Thanks.
>

I would feel safer if the compile time asserts reside in the relevant
headers and checked every time something is compiled against them.

How about the following patch: (also attached as 3a.patch)

coff.h, dos.h, dir.h: conditionalize packed pragma to gcc < 3.
add compile time assertions to make sure of correct structure packing.

Index: include/coff.h
===================================================================
RCS file: /cvs/djgpp/djgpp/include/coff.h,v
retrieving revision 1.8
diff -u -r1.8 coff.h
--- include/coff.h	14 May 2015 16:23:05 -0000	1.8
+++ include/coff.h	14 May 2015 16:32:23 -0000
@@ -150,6 +150,9 @@
  * grouping will have l_lnno = 0 and in place of physical address will be the
  * symbol table index of the function name.
  */
+#if (__GNUC__ < 3)
+#pragma pack(1)
+#endif
 struct external_lineno {
   union {
     ULONG32 l_symndx;				/* function name symbol index, iff l_lnno == 0 */
@@ -157,10 +160,14 @@
   } l_addr;
   unsigned short l_lnno;			/* line number */
 } __attribute__((packed));
-
+#if (__GNUC__ < 3)
+#pragma pack()
+#endif

 #define LINENO	struct external_lineno
 #define LINESZ	sizeof(LINENO)
+/* make sure that structure packing is correct */
+typedef int _DJCHK_EXTLINENO[(LINESZ==6)*3 - 1];


 /********************** SYMBOLS **********************/
@@ -169,6 +176,9 @@
 #define E_FILNMLEN	14	/* # characters in a file name		*/
 #define E_DIMNUM	4	/* # array dimensions in auxiliary entry */

+#if (__GNUC__ < 3)
+#pragma pack(1)
+#endif
 struct external_syment
 {
   union {
@@ -184,12 +194,18 @@
   unsigned char e_sclass;
   unsigned char e_numaux;
 } __attribute__((packed));
+#if (__GNUC__ < 3)
+#pragma pack()
+#endif

 #define N_BTMASK	(0xf)
 #define N_TMASK		(0x30)
 #define N_BTSHFT	(4)
 #define N_TSHIFT	(2)

+#if (__GNUC__ < 3)
+#pragma pack(1)
+#endif
 union external_auxent {
   struct {
     ULONG32 x_tagndx;					/* str, un, or enum tag indx */
@@ -233,11 +249,17 @@
   } __attribute__((packed)) x_tv;			/* info about .tv section (in
auxent of symbol .tv)) */

 } __attribute__((packed));
+#if (__GNUC__ < 3)
+#pragma pack()
+#endif

 #define SYMENT	struct external_syment
 #define SYMESZ	sizeof(SYMENT)
 #define AUXENT	union external_auxent
 #define AUXESZ	sizeof(AUXENT)
+/* make sure that structure packing is correct */
+typedef int _DJCHK_EXTSYMENT[(SYMESZ==18)*3 - 1];
+typedef int _DJCHK_EXTAUXENT[(AUXESZ==18)*3 - 1];


 #define _ETEXT	"etext"
@@ -325,16 +347,22 @@
 /********************** RELOCATION DIRECTIVES **********************/


-
+#if (__GNUC__ < 3)
+#pragma pack(1)
+#endif
 struct external_reloc {
   ULONG32        r_vaddr;
   ULONG32        r_symndx;
   unsigned short r_type;
 } __attribute__((packed));
-
+#if (__GNUC__ < 3)
+#pragma pack()
+#endif

 #define RELOC struct external_reloc
 #define RELSZ sizeof(RELOC)
+/* make sure that structure packing is correct */
+typedef int _DJCHK_EXTRELOC[(RELSZ==10)*3 - 1];

 #define RELOC_REL32	20	/* 32-bit PC-relative address */
 #define RELOC_ADDR32	6	/* 32-bit absolute address */
Index: include/dir.h
===================================================================
RCS file: /cvs/djgpp/djgpp/include/dir.h,v
retrieving revision 1.8
diff -u -r1.8 dir.h
--- include/dir.h	14 May 2015 16:23:05 -0000	1.8
+++ include/dir.h	14 May 2015 16:32:23 -0000
@@ -24,8 +24,9 @@
    hold the extra information.  Fields marked LFN are only valid if the magic
    is set to LFN32 */

-/* This is for g++ 2.7.2 and below */
+#if (__GNUC__ < 3) /* This is for g++ 2.7.2 and below */
 #pragma pack(1)
+#endif

 struct ffblk {
   char lfn_magic[6];			/* LFN */
@@ -54,7 +55,12 @@
   char               fd_name[14];
 } __attribute__((packed));

+#if (__GNUC__ < 3)
 #pragma pack()
+#endif
+/* make sure that structure packing is correct */
+typedef int _DJCHK_FFBLK0[(sizeof(struct ffblk)   ==290)*3 - 1];
+typedef int _DJCHK_FFBLK1[(sizeof(struct ffblklfn)==318)*3 - 1];

 #define FA_RDONLY       1
 #define FA_HIDDEN       2
Index: include/dos.h
===================================================================
RCS file: /cvs/djgpp/djgpp/include/dos.h,v
retrieving revision 1.16
diff -u -r1.16 dos.h
--- include/dos.h	14 May 2015 16:23:05 -0000	1.16
+++ include/dos.h	14 May 2015 16:32:23 -0000
@@ -214,6 +214,9 @@
 };
 #define dostime_t _dostime_t

+#if (__GNUC__ < 3)
+#pragma pack(1)
+#endif
 struct _find_t {
   char reserved[21];
   unsigned char attrib;
@@ -222,7 +225,12 @@
   unsigned long size;
   char name[256];
 } __attribute__((packed));
+#if (__GNUC__ < 3)
+#pragma pack()
+#endif
 #define find_t _find_t
+/* make sure that structure packing is correct */
+typedef int _DJCHK_FIND_T[(sizeof(struct _find_t)==286)*3 - 1];

 struct _diskfree_t {
   unsigned short total_clusters;

--
O.S.

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