REFACTOR: move sources to src/

1 files changed, 177 insertions, 0 deletions

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: */