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cxxrtl: always lazily format print messages.

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This is mostly useful for collecting coverage for the future `$check`
cell, where, depending on the flavor, formatting a message may not be
wanted even for a failed assertion.
This commit is contained in:
Catherine 2024-01-19 15:54:33 +00:00
parent b74d33d1b8
commit fc5ff7a265
3 changed files with 40 additions and 9 deletions
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15
backends/cxxrtl/runtime/cxxrtl/cxxrtl.h
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@ -945,16 +945,25 @@ struct metadata {
typedef std::map<std::string, metadata> metadata_map;
struct performer;
// An object that allows formatting a string lazily.
struct lazy_fmt {
virtual std::string operator() () const = 0;
};
// An object that can be passed to a `eval()` method in order to act on side effects.
struct performer {
// Called to evaluate a Verilog `$time` expression.
// Called by generated formatting code to evaluate a Verilog `$time` expression.
virtual int64_t vlog_time() const { return 0; }
// Called to evaluate a Verilog `$realtime` expression.
// Called by generated formatting code to evaluate a Verilog `$realtime` expression.
virtual double vlog_realtime() const { return vlog_time(); }
// Called when a `$print` cell is triggered.
virtual void on_print(const std::string &output, const metadata_map &attributes) { std::cout << output; }
virtual void on_print(const lazy_fmt &formatter, const metadata_map &attributes) {
std::cout << formatter();
}
};
// An object that can be passed to a `commit()` method in order to produce a replay log of every state change in