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Fix linker errors in user-facing timing functions (#3657)

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Before this change, a design verilated with `--timing` that does not
actually use timing features would be emitted with `eventsPending` and
`nextTimeSlot` declared in the top class. However, their definitions
would be missing, leading to linker errors during design compilation.
This patch makes Verilator always emit the definitions, which prevents
linker errors. Trying to use `nextTimeSlot` without delays in the design
will result in an error at runtime.
This commit is contained in:
Krzysztof Bieganski
2022-10-05 18:16:05 -04:00
committed by GitHub
parent f87fe4c3b4
commit 1a8188e1b4
1 changed files with 14 additions and 16 deletions
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src/V3EmitCModel.cpp
+14 -16
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@@ -439,22 +439,20 @@ class EmitCModel final : public EmitCFunc {
puts("}\n");
}
if (v3Global.usesTiming()) {
putSectionDelimiter("Events and timing");
if (auto* const delaySchedp = v3Global.rootp()->delaySchedulerp()) {
puts("bool " + topClassName() + "::eventsPending() { return !vlSymsp->TOP.");
puts(delaySchedp->nameProtect());
puts(".empty(); }\n\n");
puts("uint64_t " + topClassName() + "::nextTimeSlot() { return vlSymsp->TOP.");
puts(delaySchedp->nameProtect());
puts(".nextTimeSlot(); }\n");
} else {
puts("bool " + topClassName() + "::eventsPending() { return false; }\n\n");
puts("uint64_t " + topClassName() + "::nextTimeSlot() {\n");
puts("VL_FATAL_MT(__FILE__, __LINE__, \"\", \"%Error: No delays in the "
"design\");\n");
puts("return 0;\n}\n");
}
putSectionDelimiter("Events and timing");
if (auto* const delaySchedp = v3Global.rootp()->delaySchedulerp()) {
puts("bool " + topClassName() + "::eventsPending() { return !vlSymsp->TOP.");
puts(delaySchedp->nameProtect());
puts(".empty(); }\n\n");
puts("uint64_t " + topClassName() + "::nextTimeSlot() { return vlSymsp->TOP.");
puts(delaySchedp->nameProtect());
puts(".nextTimeSlot(); }\n");
} else {
puts("bool " + topClassName() + "::eventsPending() { return false; }\n\n");
puts("uint64_t " + topClassName() + "::nextTimeSlot() {\n");
puts("VL_FATAL_MT(__FILE__, __LINE__, \"\", \"%Error: No delays in the "
"design\");\n");
puts("return 0;\n}\n");
}
putSectionDelimiter("Utilities");