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Fix dangling reference (Issue #2622) (#2623)

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* collect multiple string literals of "__Vcvt". No functional change is intended.

* temporary variable for DPI-C should be static if its type is string

* Update src/V3EmitC.cpp

Co-authored-by: Wilson Snyder <[email protected]>

Co-authored-by: Wilson Snyder <[email protected]>
This commit is contained in:
Yutetsu TAKATSUKASA
2020-11-04 06:08:03 +09:00
committed by GitHub
co-authored by Wilson Snyder
parent 0505816d31
commit 75881754a9
3 changed files with 29 additions and 10 deletions
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src/V3Task.cpp
+17 -10
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@@ -683,6 +683,7 @@ private:
}
void makeDpiExportWrapper(AstNodeFTask* nodep, AstVar* rtnvarp) {
const char* const tmpSuffixp = V3Task::dpiTemporaryVarSuffix();
AstCFunc* dpip = new AstCFunc(nodep->fileline(), nodep->cname(), m_scopep,
(rtnvarp ? rtnvarp->dpiArgType(true, true) : ""));
dpip->dontCombine(true);
@@ -737,7 +738,7 @@ private:
argnodesp = argnodesp->addNext(new AstText(portp->fileline(), args, true));
args = "";
}
AstVarScope* outvscp = createFuncVar(dpip, portp->name() + "__Vcvt", portp);
AstVarScope* outvscp = createFuncVar(dpip, portp->name() + tmpSuffixp, portp);
// No information exposure; is already visible in import/export func template
outvscp->varp()->protect(false);
portp->protect(false);
@@ -764,7 +765,7 @@ private:
argnodesp = argnodesp->addNext(new AstText(portp->fileline(), args, true));
args = "";
}
AstVarScope* outvscp = createFuncVar(dpip, portp->name() + "__Vcvt", portp);
AstVarScope* outvscp = createFuncVar(dpip, portp->name() + tmpSuffixp, portp);
// No information exposure; is already visible in import/export func template
outvscp->varp()->protect(false);
AstVarRef* refp = new AstVarRef(portp->fileline(), outvscp,
@@ -789,14 +790,14 @@ private:
for (AstNode* stmtp = nodep->stmtsp(); stmtp; stmtp = stmtp->nextp()) {
if (AstVar* portp = VN_CAST(stmtp, Var)) {
if (portp->isIO() && portp->isWritable() && !portp->isFuncReturn()) {
dpip->addStmtsp(createAssignInternalToDpi(portp, true, "__Vcvt", ""));
dpip->addStmtsp(createAssignInternalToDpi(portp, true, tmpSuffixp, ""));
}
}
}
if (rtnvarp) {
dpip->addStmtsp(createDpiTemp(rtnvarp, ""));
dpip->addStmtsp(createAssignInternalToDpi(rtnvarp, false, "__Vcvt", ""));
dpip->addStmtsp(createAssignInternalToDpi(rtnvarp, false, tmpSuffixp, ""));
string stmt = "return " + rtnvarp->name();
stmt += rtnvarp->basicp()->isDpiPrimitive() ? ";\n" : "[0];\n";
dpip->addStmtsp(new AstCStmt(nodep->fileline(), stmt));
@@ -873,6 +874,7 @@ private:
}
void bodyDpiImportFunc(AstNodeFTask* nodep, AstVarScope* rtnvscp, AstCFunc* cfuncp) {
const char* const tmpSuffixp = V3Task::dpiTemporaryVarSuffix();
// Convert input/inout arguments to DPI types
string args;
for (AstNode* stmtp = cfuncp->argsp(); stmtp; stmtp = stmtp->nextp()) {
@@ -914,12 +916,12 @@ private:
args += "&";
}
args += portp->name() + "__Vcvt";
args += portp->name() + tmpSuffixp;
cfuncp->addStmtsp(createDpiTemp(portp, "__Vcvt"));
cfuncp->addStmtsp(createDpiTemp(portp, tmpSuffixp));
if (portp->isNonOutput()) {
cfuncp->addStmtsp(
createAssignInternalToDpi(portp, false, "", "__Vcvt"));
createAssignInternalToDpi(portp, false, "", tmpSuffixp));
}
}
}
@@ -935,8 +937,8 @@ private:
{ // Call the user function
string stmt;
if (rtnvscp) { // isFunction will no longer work as we unlinked the return var
cfuncp->addStmtsp(createDpiTemp(rtnvscp->varp(), "__Vcvt"));
stmt = rtnvscp->varp()->name() + "__Vcvt";
cfuncp->addStmtsp(createDpiTemp(rtnvscp->varp(), tmpSuffixp));
stmt = rtnvscp->varp()->name() + tmpSuffixp;
stmt += rtnvscp->varp()->basicp()->isDpiPrimitive() ? " = " : "[0] = ";
}
stmt += nodep->cname() + "(" + args + ");\n";
@@ -952,7 +954,7 @@ private:
AstVarScope* portvscp = VN_CAST(
portp->user2p(), VarScope); // Remembered when we created it earlier
cfuncp->addStmtsp(
createAssignDpiToInternal(portvscp, portp->name() + "__Vcvt"));
createAssignDpiToInternal(portvscp, portp->name() + tmpSuffixp));
}
}
}
@@ -1577,6 +1579,11 @@ bool V3Task::dpiToInternalFrStmt(AstVar* portp, const string& frName, string& fr
return false;
}
const char* V3Task::dpiTemporaryVarSuffix() {
static const char suffix[] = "__Vcvt";
return suffix;
}
void V3Task::taskAll(AstNetlist* nodep) {
UINFO(2, __FUNCTION__ << ": " << endl);
{