From 6d9d80362f9932bbc87e162b8ef7df06c73e27e1 Mon Sep 17 00:00:00 2001
From: Xavier Del Campo Romero <xavi.dcr@tutanota.com>
Date: Sat, 7 Sep 2024 00:04:38 +0200
Subject: First commit

---
 src/interp/routines/execute.c | 83 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 83 insertions(+)
 create mode 100644 src/interp/routines/execute.c

(limited to 'src/interp/routines/execute.c')

diff --git a/src/interp/routines/execute.c b/src/interp/routines/execute.c
new file mode 100644
index 0000000..49711ae
--- /dev/null
+++ b/src/interp/routines/execute.c
@@ -0,0 +1,83 @@
+/*
+ * nanowasm, a tiny WebAssembly/Wasm interpreter
+ * Copyright (C) 2023-2025  Xavier Del Campo Romero
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+ */
+
+#include <nw/interp.h>
+#include <nw/io.h>
+#include <nw/log.h>
+#include <nw/opcodes.h>
+#include <nw/ops.h>
+#include <nw/routines.h>
+
+static enum nw_state execute(struct nw_interp *const i)
+{
+    struct nw_i_sm_b *const b = &i->sm.bytecode;
+
+#ifdef NW_LOG
+    nwp_log("opcode: %s, pc=%#lx\n", nwp_op_tostr(b->op), b->pc);
+#endif
+    b->f(i);
+    i->fr.prev_op = b->op;
+    return NW_AGAIN;
+}
+
+static enum nw_state repeat(struct nw_interp *const i)
+{
+    struct nw_i_sm_b *const b = &i->sm.bytecode;
+    struct nw_next *const next = &b->next;
+    const enum nw_state n = next->fn(next->user, next);
+
+    if (n)
+        return n;
+
+    return execute(i);
+}
+
+static enum nw_state exec_pc(struct nw_interp *const i)
+{
+    struct nw_i_sm_b *const b = &i->sm.bytecode;
+    const struct nw_io_cfg *const cfg = &i->cfg.io;
+    const long pc = b->pc;
+
+    if (cfg->pc)
+    {
+        const enum nw_state n = cfg->pc(pc, &b->next, cfg->user);
+
+        if (n == NW_FATAL)
+        {
+            static const char *const exc = "pc callback failed";
+
+            i->exception = exc;
+#ifdef NW_LOG
+            nwp_log("%s, pc: %ld\n", exc, pc);
+#endif
+            return NW_FATAL;
+        }
+        else if (n)
+        {
+            i->next = repeat;
+            return n;
+        }
+    }
+
+    return execute(i);
+}
+
+enum nw_state nwp_execute(struct nw_interp *const i)
+{
+    struct nw_i_sm_b *const b = &i->sm.bytecode;
+    const struct nw_io_cfg *const cfg = &i->cfg.io;
+    const enum nw_state n = cfg->tell(&b->pc, cfg->user);
+
+    if (n)
+        return n;
+
+    b->pc -= sizeof b->op;
+    i->next = exec_pc;
+    return NW_AGAIN;
+}
-- 
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