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#pragma once
/*
* Note that cond_break can only be portably used in the body of a breakable
* construct, whereas can_loop can be used anywhere.
*/
#ifdef __BPF_FEATURE_MAY_GOTO
#define can_loop \
({ __label__ l_break, l_continue; \
bool ret = true; \
asm volatile goto("may_goto %l[l_break]" \
:::: l_break); \
goto l_continue; \
l_break: ret = false; \
l_continue:; \
ret; \
})
#define __cond_break(expr) \
({ __label__ l_break, l_continue; \
asm volatile goto("may_goto %l[l_break]" \
:::: l_break); \
goto l_continue; \
l_break: expr; \
l_continue:; \
})
#else
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
#define can_loop \
({ __label__ l_break, l_continue; \
bool ret = true; \
asm volatile goto("1:.byte 0xe5; \
.byte 0; \
.long ((%l[l_break] - 1b - 8) / 8) & 0xffff; \
.short 0" \
:::: l_break); \
goto l_continue; \
l_break: ret = false; \
l_continue:; \
ret; \
})
#define __cond_break(expr) \
({ __label__ l_break, l_continue; \
asm volatile goto("1:.byte 0xe5; \
.byte 0; \
.long ((%l[l_break] - 1b - 8) / 8) & 0xffff; \
.short 0" \
:::: l_break); \
goto l_continue; \
l_break: expr; \
l_continue:; \
})
#else
#define can_loop \
({ __label__ l_break, l_continue; \
bool ret = true; \
asm volatile goto("1:.byte 0xe5; \
.byte 0; \
.long (((%l[l_break] - 1b - 8) / 8) & 0xffff) << 16; \
.short 0" \
:::: l_break); \
goto l_continue; \
l_break: ret = false; \
l_continue:; \
ret; \
})
#define __cond_break(expr) \
({ __label__ l_break, l_continue; \
asm volatile goto("1:.byte 0xe5; \
.byte 0; \
.long (((%l[l_break] - 1b - 8) / 8) & 0xffff) << 16; \
.short 0" \
:::: l_break); \
goto l_continue; \
l_break: expr; \
l_continue:; \
})
#endif
#endif
#define cond_break __cond_break(break)
#define cond_break_label(label) __cond_break(goto label)
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