mirror of
https://github.com/frida/tinycc
synced 2024-12-20 12:12:34 +03:00
245f6a0d13
This makes available the __builtin_va_list type and __builtin variants of va_start, va_arg, va_copy and va_end. We do this via a header file that's prepended to all compilations always (except if merely preprocessing): tcc_predefs.h. That header could also be used for predefining other builtins in the future. We don't need the define hacks for musl anymore with this. Also fix x86_64 gfunc_prologue to reserve enoug space for the full va_list structure, not just 16 bytes.
65 lines
2.4 KiB
C
65 lines
2.4 KiB
C
#ifdef __x86_64__
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#ifndef _WIN64
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//This should be in sync with the declaration in our lib/libtcc1.c
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/* GCC compatible definition of va_list. */
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typedef struct {
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unsigned int gp_offset;
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unsigned int fp_offset;
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union {
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unsigned int overflow_offset;
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char *overflow_arg_area;
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};
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char *reg_save_area;
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} __builtin_va_list[1];
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void *__va_arg(__builtin_va_list ap, int arg_type, int size, int align);
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#define __builtin_va_start(ap, last) \
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(*(ap) = *(__builtin_va_list)((char*)__builtin_frame_address(0) - 24))
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#define __builtin_va_arg(ap, t) \
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(*(t *)(__va_arg(ap, __builtin_va_arg_types(t), sizeof(t), __alignof__(t))))
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#define __builtin_va_copy(dest, src) (*(dest) = *(src))
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#else /* _WIN64 */
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typedef char *__builtin_va_list;
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#define __builtin_va_arg(ap, t) ((sizeof(t) > 8 || (sizeof(t) & (sizeof(t) - 1))) \
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? **(t **)((ap += 8) - 8) : *(t *)((ap += 8) - 8))
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#endif
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#elif __arm__
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typedef char *__builtin_va_list;
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#define _tcc_alignof(type) ((int)&((struct {char c;type x;} *)0)->x)
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#define _tcc_align(addr,type) (((unsigned)addr + _tcc_alignof(type) - 1) \
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& ~(_tcc_alignof(type) - 1))
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#define __builtin_va_start(ap,last) ap = ((char *)&(last)) + ((sizeof(last)+3)&~3)
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#define __builtin_va_arg(ap,type) (ap = (void *) ((_tcc_align(ap,type)+sizeof(type)+3) \
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&~3), *(type *)(ap - ((sizeof(type)+3)&~3)))
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#elif defined(__aarch64__)
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typedef struct {
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void *__stack;
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void *__gr_top;
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void *__vr_top;
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int __gr_offs;
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int __vr_offs;
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} __builtin_va_list;
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#elif defined __riscv
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typedef char *__builtin_va_list;
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#define __va_reg_size (__riscv_xlen >> 3)
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#define _tcc_align(addr,type) (((unsigned long)addr + __alignof__(type) - 1) \
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& -(__alignof__(type)))
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#define __builtin_va_arg(ap,type) (*(sizeof(type) > (2*__va_reg_size) ? *(type **)((ap += __va_reg_size) - __va_reg_size) : (ap = (va_list)(_tcc_align(ap,type) + (sizeof(type)+__va_reg_size - 1)& -__va_reg_size), (type *)(ap - ((sizeof(type)+ __va_reg_size - 1)& -__va_reg_size)))))
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#else /* __i386__ */
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typedef char *__builtin_va_list;
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#define __builtin_va_start(ap,last) ap = ((char *)&(last)) + ((sizeof(last)+3)&~3)
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#define __builtin_va_arg(ap,type) (ap += (sizeof(type)+3)&~3, *(type *)(ap - ((sizeof(type)+3)&~3)))
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#endif
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#ifndef __builtin_va_copy
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#define __builtin_va_copy(dest, src) (dest) = (src)
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#endif
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#define __builtin_va_end(ap) (void)(ap)
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