1 files changed, 83 insertions, 0 deletions
diff --git a/backends/cxxrtl/cxxrtl_vcd_capi.cc b/backends/cxxrtl/cxxrtl_vcd_capi.cc
new file mode 100644
index 000000000..46e4f1c45
--- /dev/null
+++ b/backends/cxxrtl/cxxrtl_vcd_capi.cc
@@ -0,0 +1,83 @@
+/*
+ *  yosys -- Yosys Open SYnthesis Suite
+ *
+ *  Copyright (C) 2020  whitequark <whitequark@whitequark.org>
+ *
+ *  Permission to use, copy, modify, and/or distribute this software for any
+ *  purpose with or without fee is hereby granted.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ *  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ *  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ *  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ *  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ *  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ *  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ */
+
+// This file is a part of the CXXRTL C API. It should be used together with `cxxrtl_vcd_capi.h`.
+
+#include <backends/cxxrtl/cxxrtl_vcd.h>
+#include <backends/cxxrtl/cxxrtl_vcd_capi.h>
+
+extern const cxxrtl::debug_items &cxxrtl_debug_items_from_handle(cxxrtl_handle handle);
+
+struct _cxxrtl_vcd {
+	cxxrtl::vcd_writer writer;
+	bool flush = false;
+};
+
+cxxrtl_vcd cxxrtl_vcd_create() {
+	return new _cxxrtl_vcd;
+}
+
+void cxxrtl_vcd_destroy(cxxrtl_vcd vcd) {
+	delete vcd;
+}
+
+void cxxrtl_vcd_timescale(cxxrtl_vcd vcd, int number, const char *unit) {
+	vcd->writer.timescale(number, unit);
+}
+
+void cxxrtl_vcd_add(cxxrtl_vcd vcd, const char *name, cxxrtl_object *object) {
+	// Note the copy. We don't know whether `object` came from a design (in which case it is
+	// an instance of `debug_item`), or from user code (in which case it is an instance of
+	// `cxxrtl_object`), so casting the pointer wouldn't be safe.
+	vcd->writer.add(name, debug_item(*object));
+}
+
+void cxxrtl_vcd_add_from(cxxrtl_vcd vcd, cxxrtl_handle handle) {
+	vcd->writer.add(cxxrtl_debug_items_from_handle(handle));
+}
+
+void cxxrtl_vcd_add_from_if(cxxrtl_vcd vcd, cxxrtl_handle handle, void *data,
+														int (*filter)(void *data, const char *name,
+														              const cxxrtl_object *object)) {
+	vcd->writer.add(cxxrtl_debug_items_from_handle(handle),
+		[=](const std::string &name, const debug_item &item) {
+			return filter(data, name.c_str(), static_cast<const cxxrtl_object*>(&item));
+		});
+}
+
+void cxxrtl_vcd_add_from_without_memories(cxxrtl_vcd vcd, cxxrtl_handle handle) {
+	vcd->writer.add_without_memories(cxxrtl_debug_items_from_handle(handle));
+}
+
+void cxxrtl_vcd_sample(cxxrtl_vcd vcd, uint64_t time) {
+	if (vcd->flush) {
+		vcd->writer.buffer.clear();
+		vcd->flush = false;
+	}
+	vcd->writer.sample(time);
+}
+
+void cxxrtl_vcd_read(cxxrtl_vcd vcd, const char **data, size_t *size) {
+	if (vcd->flush) {
+		vcd->writer.buffer.clear();
+		vcd->flush = false;
+	}
+	*data = vcd->writer.buffer.c_str();
+	*size = vcd->writer.buffer.size();
+	vcd->flush = true;
+}