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Improve endianess detection. 

PR lto/94249
	* plugin-api.h: Add more robust endianess detection.
This commit is contained in:
Martin Liska 2020-03-24 11:40:10 +01:00
parent 596c90d355
commit 906b3eb9df
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GPG Key ID: 4DC182DC0FA73785
2 changed files with 71 additions and 5 deletions
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5
include/ChangeLog
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@ -1,3 +1,8 @@
2020-03-24 Martin Liska <mliska@suse.cz>
PR lto/94249
* plugin-api.h: Add more robust endianess detection.
2020-03-21 Martin Liska <mliska@suse.cz>
* plugin-api.h (enum ld_plugin_symbol_type): Remove

71
include/plugin-api.h
View File

@ -37,6 +37,60 @@
#error cannot find uint64_t type
#endif
/* Detect endianess based on __BYTE_ORDER__ macro. */
#if defined(__BYTE_ORDER__) && defined(__ORDER_BIG_ENDIAN__) && \
defined(__ORDER_LITTLE_ENDIAN__) && defined(__ORDER_PDP_ENDIAN__)
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
#define PLUGIN_LITTLE_ENDIAN 1
#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
#define PLUGIN_BIG_ENDIAN 1
#elif __BYTE_ORDER__ == __ORDER_PDP_ENDIAN__
#define PLUGIN_PDP_ENDIAN 1
#endif
#else
/* Older GCC releases (<4.6.0) can make detection from glibc macros. */
#if defined(__GLIBC__) || defined(__GNU_LIBRARY__) || defined(__ANDROID__)
#include <endian.h>
#ifdef _BYTE_ORDER
#if __BYTE_ORDER == __LITTLE_ENDIAN
#define PLUGIN_LITTLE_ENDIAN 1
#elif __BYTE_ORDER == __BIG_ENDIAN
#define PLUGIN_BIG_ENDIAN 1
#endif
#endif
#endif
/* Include all necessary header files based on target. */
#if defined(__SVR4) && defined(__sun)
#include <sys/byteorder.h>
#endif
#if defined(__FreeBSD__) || defined(__NetBSD__) || \
defined(__DragonFly__) || defined(__minix)
#include <sys/endian.h>
#endif
#if defined(__OpenBSD__)
#include <machine/endian.h>
#endif
/* Detect endianess based on _BYTE_ORDER. */
#ifdef _BYTE_ORDER
#if _BYTE_ORDER == _LITTLE_ENDIAN
#define PLUGIN_LITTLE_ENDIAN 1
#elif _BYTE_ORDER == _BIG_ENDIAN
#define PLUGIN_BIG_ENDIAN 1
#endif
#endif
/* Detect based on _WIN32. */
#if defined(_WIN32)
#define PLUGIN_LITTLE_ENDIAN 1
#endif
/* Detect based on __BIG_ENDIAN__ and __LITTLE_ENDIAN__ */
#ifdef __LITTLE_ENDIAN__
#define PLUGIN_LITTLE_ENDIAN 1
#endif
#ifdef __BIG_ENDIAN__
#define PLUGIN_BIG_ENDIAN 1
#endif
#endif
#ifdef __cplusplus
extern "C"
{
@ -89,16 +143,23 @@ struct ld_plugin_symbol
char *version;
/* This is for compatibility with older ABIs. The older ABI defined
only 'def' field. */
#ifdef __BIG_ENDIAN__
#if PLUGIN_BIG_ENDIAN == 1
char unused;
char section_kind;
char symbol_type;
char def;
#elif PLUGIN_LITTLE_ENDIAN == 1
char def;
char symbol_type;
char section_kind;
char unused;
#elif PLUGIN_PDP_ENDIAN == 1
char symbol_type;
char def;
char unused;
char section_kind;
#else
char def;
char symbol_type;
char section_kind;
char unused;
#error "Could not detect architecture endianess"
#endif
int visibility;
uint64_t size;