First commit

6 files changed, 184 insertions, 0 deletions

diff --git a/src/interp/stack/CMakeLists.txt b/src/interp/stack/CMakeLists.txt
new file mode 100644
index 0000000..51c7cb5
--- /dev/null
+++ b/src/interp/stack/CMakeLists.txt
@@ -0,0 +1,14 @@
+# 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/.
+
+target_sources(${PROJECT_NAME} PRIVATE
+    pop.c
+    push.c
+    ptr.c
+    read.c
+    write.c
+)
diff --git a/src/interp/stack/pop.c b/src/interp/stack/pop.c
new file mode 100644
index 0000000..03ed689
--- /dev/null
+++ b/src/interp/stack/pop.c
@@ -0,0 +1,37 @@
+/*
+ * 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 <nanowasm/nw.h>
+#include <nw/interp.h>
+#include <nw/log.h>
+#include <nw/stack.h>
+
+enum nw_state nwp_stack_pop(struct nw_interp *const i,
+    struct nw_sm_io *const io)
+{
+    void *const dst = (unsigned char *)io->buf + io->read;
+    const struct nw_interp_cfg *const cfg = &i->cfg;
+    const struct nw_fifo_cfg *const fc = &cfg->stack;
+    const int n = fc->pop(dst, io->n - io->read, cfg->user);
+
+    if (n < 0)
+    {
+        static const char *const exc = "failed to pop from stack";
+
+#ifdef NW_LOG
+        nwp_log("%s\n", exc);
+#endif
+        i->exception = exc;
+        return NW_FATAL;
+    }
+    else if ((io->read += n) >= io->n)
+        return NW_OK;
+
+    return NW_AGAIN;
+}
diff --git a/src/interp/stack/ptr.c b/src/interp/stack/ptr.c
new file mode 100644
index 0000000..d5fa455
--- /dev/null
+++ b/src/interp/stack/ptr.c
@@ -0,0 +1,21 @@
+/*
+ * 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 <nanowasm/nw.h>
+#include <nw/interp.h>
+#include <nw/stack.h>
+#include <stddef.h>
+
+size_t nwp_stack_ptr(const struct nw_interp *const i)
+{
+    const struct nw_interp_cfg *const cfg = &i->cfg;
+    const struct nw_fifo_cfg *const fc = &cfg->stack;
+
+    return fc->ptr(cfg->user);
+}
diff --git a/src/interp/stack/push.c b/src/interp/stack/push.c
new file mode 100644
index 0000000..b8b48ce
--- /dev/null
+++ b/src/interp/stack/push.c
@@ -0,0 +1,37 @@
+/*
+ * 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 <nanowasm/nw.h>
+#include <nw/interp.h>
+#include <nw/log.h>
+#include <nw/stack.h>
+
+enum nw_state nwp_stack_push(struct nw_interp *const i,
+    struct nw_sm_io *const io)
+{
+    const void *const src = (const unsigned char *)io->buf + io->read;
+    const struct nw_interp_cfg *const cfg = &i->cfg;
+    const struct nw_fifo_cfg *const fc = &cfg->stack;
+    const int n = fc->push(src, io->n - io->read, cfg->user);
+
+    if (n < 0)
+    {
+        static const char *const exc = "failed to push to stack";
+
+#ifdef NW_LOG
+        nwp_log("%s\n", exc);
+#endif
+        i->exception = exc;
+        return NW_FATAL;
+    }
+    else if ((io->read += n) >= io->n)
+        return NW_OK;
+
+    return NW_AGAIN;
+}
diff --git a/src/interp/stack/read.c b/src/interp/stack/read.c
new file mode 100644
index 0000000..8db6bcc
--- /dev/null
+++ b/src/interp/stack/read.c
@@ -0,0 +1,37 @@
+/*
+ * 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 <nanowasm/nw.h>
+#include <nw/interp.h>
+#include <nw/log.h>
+#include <nw/stack.h>
+
+enum nw_state nwp_stack_read(struct nw_interp *const i,
+    struct nw_sm_io *const io, const size_t offset)
+{
+    void *const dst = (unsigned char *)io->buf + io->read;
+    const struct nw_interp_cfg *const cfg = &i->cfg;
+    const struct nw_fifo_cfg *const fc = &cfg->stack;
+    const int n = fc->read(offset + io->read, dst, io->n - io->read, cfg->user);
+
+    if (n < 0)
+    {
+        static const char *const exc = "failed to read from stack";
+
+#ifdef NW_LOG
+        nwp_log("%s\n", exc);
+#endif
+        i->exception = exc;
+        return NW_FATAL;
+    }
+    else if ((io->read += n) >= io->n)
+        return NW_OK;
+
+    return NW_AGAIN;
+}
diff --git a/src/interp/stack/write.c b/src/interp/stack/write.c
new file mode 100644
index 0000000..73e749e
--- /dev/null
+++ b/src/interp/stack/write.c
@@ -0,0 +1,38 @@
+/*
+ * 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 <nanowasm/nw.h>
+#include <nw/interp.h>
+#include <nw/log.h>
+#include <nw/stack.h>
+
+enum nw_state nwp_stack_write(struct nw_interp *const i,
+    struct nw_sm_io *const io, const size_t offset)
+{
+    const void *const src = (const unsigned char *)io->buf + io->read;
+    const struct nw_interp_cfg *const cfg = &i->cfg;
+    const struct nw_fifo_cfg *const fc = &cfg->stack;
+    const int n = fc->write(offset + io->read, src, io->n - io->read,
+        cfg->user);
+
+    if (n < 0)
+    {
+        static const char *const exc = "failed to write to stack";
+
+#ifdef NW_LOG
+        nwp_log("%s\n", exc);
+#endif
+        i->exception = exc;
+        return NW_FATAL;
+    }
+    else if ((io->read += n) >= io->n)
+        return NW_OK;
+
+    return NW_AGAIN;
+}