From a8d6f8bf30c07edb775e56889f568ca20240bedf Mon Sep 17 00:00:00 2001 From: lemon Date: Tue, 17 Mar 2026 13:22:00 +0100 Subject: REFACTOR: move sources to src/ --- src/c_builtin.c | 177 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 177 insertions(+) create mode 100644 src/c_builtin.c (limited to 'src/c_builtin.c') diff --git a/src/c_builtin.c b/src/c_builtin.c new file mode 100644 index 0000000..5c59857 --- /dev/null +++ b/src/c_builtin.c @@ -0,0 +1,177 @@ +#include "c.h" +#include "../ir/ir.h" + +static bool +callcheck(const struct span *span, int nparam, const union type *param, int narg, struct expr *args) +{ + bool ok = 1; + for (int i = 0, n = narg < nparam ? narg : nparam; i < n; ++i) { + if (!assigncheck(typedecay(param[i]), &args[i])) { + ok = 0; + error(&args[i].span, "arg #%d of type '%ty' is incompatible with '%ty'", + i, args[i].ty, param[i]); + } + } + + if (narg > nparam) { + error(&args[nparam].span, "too many args to builtin function taking %d params", nparam); + ok = 0; + } else if (narg < nparam) { + error(span, "not enough args to builtin function taking %d param%s", nparam, + nparam != 1 ? "s" : ""); + ok = 0; + } + return ok; +} + +#define DEF_FNLIKE_SEMA(name, retty, ...) \ + static bool \ + name##_sema(struct comp *cm, struct expr *ex) { \ + union type par[] = { {{0}}, __VA_ARGS__ }; \ + ex->ty = retty; \ + return callcheck(&ex->span, countof(par)-1, par+1, ex->narg, ex->sub+1); \ + } + +/* __builtin_va_start */ +static bool +va_start_sema(struct comp *cm, struct expr *ex) +{ + ex->ty = mktype(TYVOID); + return callcheck(&ex->span, 1, &cvalistty, ex->narg, ex->sub+1); +} +static union ref +va_start_comp(struct function *fn, struct expr *ex, bool discard) +{ + assert(ex->t == ECALL && ex->narg == 1); + assert(typedecay(ex->sub[1].ty).bits == typedecay(cvalistty).bits); + if (!typedata[fn->fnty.dat].variadic) + error(&ex->span, "va_start used in non-variadic function"); + addinstr(fn, mkinstr(Ovastart, 0, compileexpr(fn, &ex->sub[1], 0))); + return NOREF; +} + +/* __builtin_va_end */ +static bool +va_end_sema(struct comp *cm, struct expr *ex) +{ + ex->ty = mktype(TYVOID); + return callcheck(&ex->span, 1, &cvalistty, ex->narg, ex->sub+1); +} + +static union ref +va_end_comp(struct function *fn, struct expr *ex, bool discard) +{ + return NOREF; +} + +/* __builtin_va_copy */ +DEF_FNLIKE_SEMA(va_copy, mktype(TYVOID), cvalistty, cvalistty) +static union ref +va_copy_comp(struct function *fn, struct expr *ex, bool discard) +{ + union irtype typ = mkirtype(cvalistty.t == TYARRAY ? typechild(cvalistty) : cvalistty); + for (int i = 1; i <= 2; ++i) + assert(typedecay(ex->sub[i].ty).bits == typedecay(cvalistty).bits); + union ref dst = compileexpr(fn, &ex->sub[1], 0), src = compileexpr(fn, &ex->sub[2], 0); + addinstr(fn, mkarginstr(typ, dst)); + addinstr(fn, mkarginstr(typ, src)); + addinstr(fn, mkintrin(INstructcopy, 0, 2)); + return NOREF; +} + +/* __builtin_trap */ +DEF_FNLIKE_SEMA(trap, mktype(TYVOID), ) +static union ref +trap_comp(struct function *fn, struct expr *ex, bool discard) +{ + puttrap(fn); + useblk(fn, newblk(fn)); /* unreachable block, but simplifies expr codegen */ + return NOREF; +} + +static inline union ref +cvtintref(struct function *fn, enum irclass dst, union ref src) +{ + if (src.t == RTMP) { + if (insrescls(instrtab[src.i]) != dst) + return addinstr(fn, mkinstr(Ocopy, dst, src)); + return src; + } else if (isintcon(src)) { + vlong x = intconval(src); + return mkintcon(dst, cls2siz[dst] == 4 ? (int)x : x); + } + assert(!"int ref?"); +} + +/* __builtin_bswap16 */ +DEF_FNLIKE_SEMA(bswap16, mktype(TYUSHORT), mktype(TYUSHORT)) +static union ref +bswap16_comp(struct function *fn, struct expr *ex, bool discard) +{ + assert(isint(ex->ty)); + return irunop(fn, Obswap16, KI32, scalarcvt(fn, ex->ty, ex->sub[1].ty, + compileexpr(fn, &ex->sub[1], 0))); +} +/* __builtin_bswap32 */ +DEF_FNLIKE_SEMA(bswap32, mktype(TYUINT), mktype(TYUINT)) +static union ref +bswap32_comp(struct function *fn, struct expr *ex, bool discard) +{ + assert(isint(ex->ty)); + return irunop(fn, Obswap32, KI32, scalarcvt(fn, ex->ty, ex->sub[1].ty, + compileexpr(fn, &ex->sub[1], 0))); +} +/* __builtin_bswap64 */ +DEF_FNLIKE_SEMA(bswap64, mktype(TYUVLONG), mktype(TYUVLONG)) +static union ref +bswap64_comp(struct function *fn, struct expr *ex, bool discard) +{ + assert(isint(ex->ty)); + return irunop(fn, Obswap64, KI64, scalarcvt(fn, ex->ty, ex->sub[1].ty, + compileexpr(fn, &ex->sub[1], 0))); +} + +#define LIST_BUILTINS(_) \ + _(va_start) _(va_copy) _(va_end) \ + _(trap) _(bswap16) _(bswap32) _(bswap64) + +static const struct { + const char *name; + struct builtin b; +} tab[] = { +#define FNS(x) { "__builtin_" #x, { x##_sema, x##_comp } }, + LIST_BUILTINS(FNS) +#undef FNS +}; + +void +putbuiltins(struct env *env) +{ + for (int i = 0; i < countof(tab); ++i) { + envadddecl(env, &(struct decl) { + .name = intern(tab[i].name), + .isbuiltin = 1, + .builtin = &tab[i].b, + }); + } +} + +/* this is separate because it's a keyword */ +union ref +builtin_va_arg_comp(struct function *fn, const struct expr *ex, bool discard) +{ + assert(ex->t == EVAARG && ex->ty.t); + enum irclass k = isagg(ex->ty) ? KPTR : type2cls[scalartypet(ex->ty)]; + return addinstr(fn, mkinstr(Ovaarg, k, compileexpr(fn, ex->sub, 0), mktyperef(mkirtype(ex->ty)))); +} + +bool +hasbuiltin(const char *name, uint len) +{ + for (int i = 0; i < countof(tab); ++i) + if (!strncmp(name, tab[i].name, len)) + return 1; + return 0; +} + +/* vim:set ts=3 sw=3 expandtab: */ -- cgit v1.2.3