mirrors/yosys
3
0
Fork 0
mirror of https://github.com/YosysHQ/yosys synced 2025-11-03 21:09:12 +00:00
Code Activity

json: Add support for memories.

Browse source 
Previously, memories were silently discarded by the JSON backend, making
round-tripping modules with them crash.

Since there are already some users using JSON to implement custom
external passes that use memories (and infer width/size from memory
ports), let's fix this by just making JSON backend and frontend support
memories as first-class objects.

Processes are still not supported, and will now cause a hard error.

Fixes #1908.
This commit is contained in:
Marcelina Kościelnicka 2021-03-09 20:42:14 +01:00
parent a55bf6375b
commit 3d9698153f
2 changed files with 88 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

42
backends/json/json.cc
View file

@ -135,6 +135,10 @@ struct JsonWriter
// reserve 0 and 1 to avoid confusion with "0" and "1"
sigidcounter = 2;
if (module->has_processes()) {
log_error("Module %s contains processes, which are not supported by JSON backend.\n", log_id(module));
}
f << stringf(" %s: {\n", get_name(module->name).c_str());
f << stringf(" \"attributes\": {");
@ -216,6 +220,27 @@ struct JsonWriter
}
f << stringf("\n },\n");
if (!module->memories.empty()) {
f << stringf(" \"memories\": {");
first = true;
for (auto &it : module->memories) {
if (use_selection && !module->selected(it.second))
continue;
f << stringf("%s\n", first ? "" : ",");
f << stringf(" %s: {\n", get_name(it.second->name).c_str());
f << stringf(" \"hide_name\": %s,\n", it.second->name[0] == '$' ? "1" : "0");
f << stringf(" \"attributes\": {");
write_parameters(it.second->attributes);
f << stringf("\n },\n");
f << stringf(" \"width\": %d,\n", it.second->width);
f << stringf(" \"start_offset\": %d,\n", it.second->start_offset);
f << stringf(" \"size\": %d\n", it.second->size);
f << stringf(" }");
first = false;
}
f << stringf("\n },\n");
}
f << stringf(" \"netnames\": {");
first = true;
for (auto w : module->wires()) {
@ -332,6 +357,10 @@ struct JsonBackend : public Backend {
log(" <cell_name>: <cell_details>,\n");
log(" ...\n");
log(" },\n");
log(" \"memories\": {\n");
log(" <memory_name>: <memory_details>,\n");
log(" ...\n");
log(" },\n");
log(" \"netnames\": {\n");
log(" <net_name>: <net_details>,\n");
log(" ...\n");
@ -379,6 +408,19 @@ struct JsonBackend : public Backend {
log(" },\n");
log(" }\n");
log("\n");
log("And <memory_details> is:\n");
log("\n");
log(" {\n");
log(" \"hide_name\": <1 | 0>,\n");
log(" \"attributes\": {\n");
log(" <attribute_name>: <attribute_value>,\n");
log(" ...\n");
log(" },\n");
log(" \"width\": <memory width>\n");
log(" \"start_offset\": <the lowest valid memory address>\n");
log(" \"size\": <memory size>\n");
log(" }\n");
log("\n");
log("And <net_details> is:\n");
log("\n");
log(" {\n");