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Support DPI imports and exports with double underscores.

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This commit is contained in:
Wilson Snyder
2024-09-22 22:06:39 -04:00
parent d288488b7f
commit 706679e6b1
8 changed files with 40 additions and 10 deletions
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src/V3Task.cpp
+17 -7
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@@ -723,6 +723,14 @@ class TaskVisitor final : public VNVisitor {
return dpiproto;
}
static void checkLegalCIdentifier(AstNode* nodep, const string& name) {
if (name.end() != std::find_if(name.begin(), name.end(), [](char c) {
return !std::isalnum(c) && c != '_';
})) {
nodep->v3error("DPI function has illegal characters in C identifier name: " << name);
}
}
static AstNode* createDpiTemp(AstVar* portp, const string& suffix) {
const string stmt = portp->dpiTmpVarType(portp->name() + suffix) + ";\n";
return new AstCStmt{portp->fileline(), stmt};
@@ -822,8 +830,11 @@ class TaskVisitor final : public VNVisitor {
}
AstCFunc* makeDpiExportDispatcher(AstNodeFTask* nodep, AstVar* rtnvarp) {
// Verilog name has __ conversion and other tricks, to match DPI C code, back that out
const string name = AstNode::prettyName(nodep->cname());
checkLegalCIdentifier(nodep, name);
const char* const tmpSuffixp = V3Task::dpiTemporaryVarSuffix();
AstCFunc* const funcp = new AstCFunc{nodep->fileline(), nodep->cname(), m_scopep,
AstCFunc* const funcp = new AstCFunc{nodep->fileline(), name, m_scopep,
(rtnvarp ? rtnvarp->dpiArgType(true, true) : "")};
funcp->dpiExportDispatcher(true);
funcp->dpiContext(nodep->dpiContext());
@@ -831,7 +842,7 @@ class TaskVisitor final : public VNVisitor {
funcp->entryPoint(true);
funcp->isStatic(true);
funcp->protect(false);
funcp->cname(nodep->cname());
funcp->cname(name);
// Add DPI Export to top, since it's a global function
m_topScopep->scopep()->addBlocksp(funcp);
@@ -949,15 +960,14 @@ class TaskVisitor final : public VNVisitor {
}
AstCFunc* makeDpiImportPrototype(AstNodeFTask* nodep, AstVar* rtnvarp) {
if (nodep->cname() != AstNode::prettyName(nodep->cname())) {
nodep->v3error("DPI function has illegal characters in C identifier name: "
<< AstNode::prettyNameQ(nodep->cname()));
}
// Verilog name has __ conversion and other tricks, to match DPI C code, back that out
const string name = AstNode::prettyName(nodep->cname());
checkLegalCIdentifier(nodep, name);
// Tasks (but not void functions) return a boolean 'int' indicating disabled
const string rtnType = rtnvarp ? rtnvarp->dpiArgType(true, true)
: nodep->dpiTask() ? "int"
: "";
AstCFunc* const funcp = new AstCFunc{nodep->fileline(), nodep->cname(), m_scopep, rtnType};
AstCFunc* const funcp = new AstCFunc{nodep->fileline(), name, m_scopep, rtnType};
funcp->dpiContext(nodep->dpiContext());
funcp->dpiImportPrototype(true);
funcp->dontCombine(true);