56 lines
1.3 KiB
C++
56 lines
1.3 KiB
C++
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/* A simple Yosys plugin. (Copy&paste from http://stackoverflow.com/questions/32093541/how-does-the-yosys-consteval-api-work)
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Usage example:
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$ cat > evaldemo.v <<EOT
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module main(input [1:0] A, input [7:0] B, C, D, output [7:0] Y);
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assign Y = A == 0 ? B : A == 1 ? C : A == 2 ? D : 42;
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endmodule
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EOT
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$ yosys-config --build evaldemo.so evaldemo.cc
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$ yosys -m evaldemo.so -p evaldemo evaldemo.v
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*/
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#include "kernel/yosys.h"
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#include "kernel/consteval.h"
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USING_YOSYS_NAMESPACE
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PRIVATE_NAMESPACE_BEGIN
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struct EvalDemoPass : public Pass
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{
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EvalDemoPass() : Pass("evaldemo") { }
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virtual void execute(vector<string>, Design *design)
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{
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Module *module = design->top_module();
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if (module == nullptr)
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log_error("No top module found!\n");
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Wire *wire_a = module->wire("\\A");
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Wire *wire_y = module->wire("\\Y");
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if (wire_a == nullptr)
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log_error("No wire A found!\n");
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if (wire_y == nullptr)
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log_error("No wire Y found!\n");
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ConstEval ce(module);
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for (int v = 0; v < 4; v++) {
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ce.push();
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ce.set(wire_a, Const(v, GetSize(wire_a)));
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SigSpec sig_y = wire_y, sig_undef;
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if (ce.eval(sig_y, sig_undef))
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log("Eval results for A=%d: Y=%s\n", v, log_signal(sig_y));
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else
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log("Eval failed for A=%d: Missing value for %s\n", v, log_signal(sig_undef));
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ce.pop();
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}
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}
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} EvalDemoPass;
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PRIVATE_NAMESPACE_END
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