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cxxrtl: escape colon in variable names in VCD writer.

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The following VCD file crashes GTKWave's VCD loader:

    $var wire 1 ! x:1 $end
    $enddefinitions $end

In practice, a colon can be a part of a variable name that is
translated from a Verilog function, something like:

    update$func$.../hdl/hazard3_csr.v:350$2534.$result
This commit is contained in:
whitequark 2021-07-19 16:20:49 +00:00
parent 9af88951bc
commit fc84f23001
1 changed files with 14 additions and 1 deletions
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15
backends/cxxrtl/cxxrtl_vcd.h
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@ -69,12 +69,25 @@ class vcd_writer {
} while (ident != 0);
}
void emit_name(const std::string &name) {
for (char c : name) {
if (c == ':') {
// Due to a bug, GTKWave cannot parse a colon in the variable name, causing the VCD file
// to be unreadable. It cannot be escaped either, so replace it with the sideways colon.
buffer += "..";
} else {
buffer += c;
}
}
}
void emit_var(const variable &var, const std::string &type, const std::string &name,
size_t lsb_at, bool multipart) {
assert(!streaming);
buffer += "$var " + type + " " + std::to_string(var.width) + " ";
emit_ident(var.ident);
buffer += " " + name;
buffer += " ";
emit_name(name);
if (multipart || name.back() == ']' || lsb_at != 0) {
if (var.width == 1)
buffer += " [" + std::to_string(lsb_at) + "]";