WIP sym + cgen

1 files changed, 163 insertions, 0 deletions

diff --git a/src/prc1/cgen/qbe/call.c b/src/prc1/cgen/qbe/call.c
new file mode 100644
index 0000000..0f49d76
--- /dev/null
+++ b/src/prc1/cgen/qbe/call.c
@@ -0,0 +1,163 @@
+#include "call.h"
+#include "cgen.h"
+#include "cgen/prv.h"
+#include "qbe.h"
+#include <stdio.h>
+
+#if 0
+static int gettmp(char *tmp, size_t n)
+{
+    size_t j;
+
+    for (j = 0; j < n; j++)
+    {
+        char c = tmp[j];
+
+        if (!c)
+            return tmp[j] = 'a';
+        else if (c != 'z')
+            return ++(tmp[j]);
+    }
+
+    return EOF;
+}
+
+static int param_lit(const struct lit *lit, struct cgen *c)
+{
+    printf("l $%s", lit->name);
+    return 0;
+}
+
+static int param_id(const struct stentry *e, struct cgen *c, char *tmp,
+    size_t n)
+{
+    const char *name = e->tk->s;
+    const struct type *t = e->t;
+
+    printf("%s ", cgen_sz(t->sz));
+
+    if (cgen_global(c->fn, e))
+        printf("$%s", name);
+    else if (cgen_abity(t))
+    {
+        if (gettmp(tmp, n) == EOF)
+            return -1;
+
+        printf("%%%s", tmp);
+    }
+    else
+        printf("%%%s_", name);
+
+    return 0;
+}
+
+static int param_c(const struct type *t, struct cgen *cg)
+{
+    const union c *c = &t->u.c;
+
+    /* TODO: adapt type to expected param size */
+    fputs("l ", stdout);
+
+    if (t->sign)
+        printf("%lld", c->v);
+    else
+        printf("%llu", c->uv);
+
+    return 0;
+}
+
+static int param_num(const struct callparam *cp, struct cgen *c)
+{
+    const union callv *u = &cp->u;
+
+    /* TODO: adapt type to expected param size */
+    fputs("w ", stdout);
+
+    if (cp->sign)
+        printf("%lld", u->v);
+    else
+        printf("%llu", u->uv);
+
+    return 0;
+}
+
+static int param_load(const struct call *m, struct cgen *c)
+{
+    char tmp[sizeof "abcdefghijklmnopqrstuvwxyz"] = {0};
+
+    for (size_t i = 0; i < m->nparams; i++)
+    {
+        const struct callparam *cp = &m->params[i];
+        const struct stentry *e = cp->entry;
+
+        if (!e || cgen_global(c->fn, e) || !cgen_abity(e->t))
+            continue;
+        else if (gettmp(tmp, sizeof tmp - 1) == EOF)
+        {
+            fprintf(stderr, "%s: exhausted temporaries\n", __func__);
+            return -1;
+        }
+
+        printf("%%%s =%s load%s %%%s_\n", tmp, cgen_sz(e->t->sz),
+            cgen_load(e->t), e->tk->s);
+    }
+
+    return 0;
+}
+
+int call_cgen(const struct call *m, struct cgen *c)
+{
+    char tmps[sizeof "abcdefghijklmnopqrstuvwxyz"] = {0};
+    const struct stentry *ret = m->ret;
+    const char *tmp;
+    size_t sz;
+
+    if (param_load(m, c))
+        return -1;
+    else if (ret)
+    {
+        tmp = cgen_tmp((sz = ret->t->sz));
+        printf("%%%s =%s ", tmp, cgen_sz(sz));
+    }
+
+    printf("call $%s(", m->tk->s);
+
+    for (size_t i = 0; i < m->nparams; i++)
+    {
+        const struct callparam *cp = &m->params[i];
+        int var = m->pr->variadic;
+
+        if (cp->lit)
+            param_lit(cp->lit, c);
+        else if (cp->entry)
+            param_id(cp->entry, c, tmps, sizeof tmps - 1);
+        else if (cp->t)
+            param_c(cp->t, c);
+        else
+            param_num(cp, c);
+
+        if (var && i + 1 == var - 1)
+            fputs(", ...", stdout);
+
+        if (i + 1 < m->nparams)
+            fputs(", ", stdout);
+    }
+
+    puts(")");
+
+    if (ret)
+    {
+        printf("store%s %%%s, ", cgen_sz(sz), tmp);
+        cgen_printvar(c->fn, ret);
+        putchar('\n');
+    }
+
+    return 0;
+}
+#endif
+
+int qbe_call(const struct call *m, struct cgen *c)
+{
+    fprintf(stderr, "%s: TODO\n", __func__);
+    return -1;
+}