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Added comments in blifparse.cc

This commit is contained in:
AdvaySingh1 2026-02-02 10:15:59 -08:00
parent 9646319098
commit b005f69e27
1 changed files with 8 additions and 3 deletions
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11
frontends/blif/blifparse.cc
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@ -249,8 +249,12 @@ void parse_blif(RTLIL::Design *design, std::istream &f, IdString dff_name, bool
blif_maxnum = 0;
}
// Check for .node_retention_begin after .end
if (read_next_line(buffer, buffer_size, line_count, f)) {
// Parse optional node retention section that tracks signal source origins for ABC reintegration.
// Expected format:
// .node_retention_begin
// <node_name> SRC <source1> [source2] ...
// .node_retention_end
if (read_next_line(buffer, buffer_size, line_count, f)) {
char *next_cmd = strtok(buffer, " \t\r\n");
if (next_cmd != nullptr && !strcmp(next_cmd, ".node_retention_begin")) {
// Parse node retention information
@ -267,7 +271,7 @@ void parse_blif(RTLIL::Design *design, std::istream &f, IdString dff_name, bool
std::string node_name = line_cmd;
char *src_token = strtok(NULL, " \t\r\n");
if (src_token == nullptr || strcmp(src_token, "SRC"))
continue;
continue; // Skip malformed lines missing "SRC" keyword
// Collect all source nodes
std::string sources;
@ -284,6 +288,7 @@ void parse_blif(RTLIL::Design *design, std::istream &f, IdString dff_name, bool
IdString wire_id = RTLIL::escape_id(node_name);
Wire *wire = module->wire(wire_id);
if (wire != nullptr && !sources.empty()) {
// Store sources as attribute for abc.cc to propagate src annotations
wire->attributes[RTLIL::IdString("\\node_retention_sources")] = Const(sources);
}
}