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cxxrtl: refactor the formatter and use a closure.

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This commit achieves three roughly equally important goals:
1. To bring the rendering code in kernel/fmt.cc and in cxxrtl.h as close
   together as possible, with an ideal of only having the bigint library
   as the difference between the render functions.
2. To make the treatment of `$time` and `$realtime` in CXXRTL closer to
   the Verilog semantics, at least in the formatting code.
3. To change the code generator so that all of the `$print`-to-`string`
   conversion code is contained inside of a closure.

There are two reasons to aim for goal (3):
a. Because output redirection through definition of a global ostream
   object is neither convenient nor useful for environments where
   the output is consumed by other code rather than being printed on
   a terminal.
b. Because it may be desirable to, in some cases, ignore the `$print`
   cells that are present in the netlist based on a runtime decision.
   This is doubly true for an upcoming `$check` cell implementing
   assertions, since failing a `$check` would by default cause a crash.
This commit is contained in:
Catherine 2024-01-16 09:08:07 +00:00
parent bf1a99da09
commit a33acb7cd9
5 changed files with 192 additions and 173 deletions
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7
tests/fmt/always_full_tb.cc
View file

@ -2,8 +2,13 @@
int main()
{
struct : public performer {
int64_t time() const override { return 1; }
void on_print(const std::string &output, const cxxrtl::metadata_map &) override { std::cerr << output; }
} performer;
cxxrtl_design::p_always__full uut;
uut.p_clk.set(!uut.p_clk);
uut.step();
uut.step(&performer);
return 0;
}