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Support dynamic loading of VPI extensions (#7727)

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This commit is contained in:
Matthew Ballance
2026-06-28 09:28:09 -04:00
committed by GitHub
parent 3853301367
commit d023b3b075
27 changed files with 549 additions and 0 deletions
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src/V3EmitMk.cpp
+17
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@@ -567,6 +567,12 @@ public:
of.puts("VM_TRACE_VCD = ");
of.puts(v3Global.opt.traceEnabledVcd() ? "1" : "0");
of.puts("\n");
of.puts("# VPI enabled? 0/1 (from --vpi)\n");
of.puts("VM_VPI = ");
of.puts(v3Global.opt.vpi() ? "1" : "0");
of.puts("\n");
// Link flags for runtime VPI library loading are emitted by emitOverallMake() after
// verilated.mk is included (so $(CFG_LDFLAGS_DYNAMIC)/$(CFG_LDLIBS_DYNAMIC) are defined).
of.puts("\n### Object file lists...\n");
for (int support = 0; support < 3; ++support) {
@@ -729,6 +735,17 @@ public:
of.puts("\n### Executable rules... (from --exe)\n");
of.puts("VPATH += $(VM_USER_DIR)\n");
of.puts("\n");
if (v3Global.opt.vpi()) {
// Runtime VPI library loading (+verilator+vpi+<lib>) needs the executable to
// export its VPI symbols so the dlopen'd library can resolve them, plus the
// dl library for dlopen/dlsym. The exact flags are probed at configure time
// (CFG_LDFLAGS_DYNAMIC / CFG_LDLIBS_DYNAMIC in verilated.mk).
of.puts("# Runtime VPI library loading (+verilator+vpi+) link requirements\n");
of.puts("LDFLAGS += $(CFG_LDFLAGS_DYNAMIC)\n");
of.puts("LDLIBS += $(CFG_LDLIBS_DYNAMIC)\n");
of.puts("\n");
}
}
const string compilerIncludePch