30fed66616
Trailing `args: ..T` on a #foreign declaration now lowers to the C calling convention's `...` instead of sx-side slice-packing. Drops the per-arity #foreign-shim workaround for callers of variadic C APIs (__android_log_print, printf-family, etc.). Closes issue-0043. - IR: Function.is_variadic on inst.Function; declareFunction drops the variadic param from the IR signature for foreign+variadic decls. - emit_llvm: LLVMFunctionType receives is_var_arg=1 when the flag is set; call lowering passes extras through unchanged. - Lowering: packVariadicCallArgs early-outs for foreign+variadic (no slice-pack); new promoteCVariadicArgs applies C default argument promotion (bool/s8/s16/u8/u16 -> s32, f32 -> f64) to extras past the fixed param count. - Test: examples/ffi-foreign-cvariadic.sx + .c exercise s64/f64/s32 returns through C va_arg over s32/f64/*u8 element types. 134 host + 6 cross tests pass on the WIP-less baseline.
31 lines
656 B
C
31 lines
656 B
C
#include <stdarg.h>
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long long sx_ffi_sum_ints(int n, ...) {
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va_list ap;
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va_start(ap, n);
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long long total = 0;
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for (int i = 0; i < n; i++) total += va_arg(ap, int);
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va_end(ap);
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return total;
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}
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double sx_ffi_avg_doubles(int n, ...) {
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va_list ap;
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va_start(ap, n);
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double total = 0.0;
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for (int i = 0; i < n; i++) total += va_arg(ap, double);
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va_end(ap);
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if (n == 0) return 0.0;
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return total / n;
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}
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int sx_ffi_count_args(const char *tag, ...) {
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(void) tag;
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va_list ap;
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va_start(ap, tag);
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int count = 0;
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while (va_arg(ap, const char *) != 0) count++;
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va_end(ap);
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return count;
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}
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