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Support force assignments to unpacked structs (#7060)

This commit is contained in:
Ryszard Rozak 2026-02-17 01:05:07 +01:00 committed by GitHub
parent c21498293e
commit 8491d6a80c
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8 changed files with 295 additions and 181 deletions
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329
src/V3Force.cpp
View File

@ -47,6 +47,7 @@
#include "V3Force.h"
#include "V3AstUserAllocator.h"
#include "V3UniqueNames.h"
VL_DEFINE_DEBUG_FUNCTIONS;
@ -78,10 +79,12 @@ public:
AstVarScope* const m_rdVscp; // New variable to replace read references with
AstVarScope* const m_valVscp; // Forced value
AstVarScope* const m_enVscp; // Force enabled signal
V3UniqueNames m_iterNames; // Names for loop iteration variables
explicit ForceComponentsVarScope(AstVarScope* vscp, ForceComponentsVar& fcv)
: m_rdVscp{new AstVarScope{vscp->fileline(), vscp->scopep(), fcv.m_rdVarp}}
, m_valVscp{new AstVarScope{vscp->fileline(), vscp->scopep(), fcv.m_valVarp}}
, m_enVscp{new AstVarScope{vscp->fileline(), vscp->scopep(), fcv.m_enVarp}} {
, m_enVscp{new AstVarScope{vscp->fileline(), vscp->scopep(), fcv.m_enVarp}}
, m_iterNames{"__VForceIter"} {
m_rdVscp->addNext(m_enVscp);
m_rdVscp->addNext(m_valVscp);
vscp->addNextHere(m_rdVscp);
@ -94,63 +97,30 @@ public:
activeInitp->senTreeStorep(activeInitp->sentreep());
vscp->scopep()->addBlocksp(activeInitp);
AstVarRef* const enRefp = new AstVarRef{flp, m_enVscp, VAccess::WRITE};
// Create statements that update __Rd variable.
// These nodes will be copied and used also for __En initialization
AstVarRef* const rdRefp = new AstVarRef{flp, m_rdVscp, VAccess::WRITE};
std::vector<AstAssign*> assigns;
AstNodeStmt* const rdUpdateStmtsp
= getForcedUpdateStmtsRecursep(rdRefp, vscp, rdRefp, assigns);
AstNodeStmt* toInsertp = nullptr;
AstNodeStmt* outerStmtp = nullptr;
std::vector<AstNodeExpr*> loopVarRefs;
if (VN_IS(enRefp->dtypep()->skipRefp(), UnpackArrayDType)) {
// Create a loop to set all elements of __VforceEn array to 0.
// That loop node is then copied and used for updating elements of __VforceRd array
if (AstUnpackArrayDType* const unpackedp
= VN_CAST(m_rdVscp->varp()->dtypep(), UnpackArrayDType)) {
std::vector<AstUnpackArrayDType*> dims = unpackedp->unpackDimensions();
loopVarRefs.reserve(dims.size());
for (size_t i = 0; i < dims.size(); i++) {
AstVar* const loopVarp = new AstVar{
flp, VVarType::MODULETEMP,
m_rdVscp->varp()->name() + "__VwhileIter" + std::to_string(i),
VFlagBitPacked{}, 32};
m_rdVscp->varp()->addNext(loopVarp);
AstVarScope* const loopVarScopep
= new AstVarScope{flp, m_rdVscp->scopep(), loopVarp};
m_rdVscp->addNext(loopVarScopep);
AstVarRef* const readRefp
= new AstVarRef{flp, loopVarScopep, VAccess::READ};
loopVarRefs.push_back(readRefp);
AstNodeStmt* const currInitp
= new AstAssign{flp, new AstVarRef{flp, loopVarScopep, VAccess::WRITE},
new AstConst{flp, 0}};
if (toInsertp) {
toInsertp->addNextHere(currInitp);
} else {
outerStmtp = currInitp;
}
AstLoop* const currWhilep = new AstLoop{flp};
currInitp->addNextHere(currWhilep);
AstLoopTest* const loopTestp = new AstLoopTest{
flp, currWhilep,
new AstNeq{flp, readRefp,
new AstConst{
flp, static_cast<uint32_t>(dims[i]->elementsConst())}}};
currWhilep->addStmtsp(loopTestp);
toInsertp = loopTestp;
AstAssign* const currIncrp = new AstAssign{
flp, new AstVarRef{flp, loopVarScopep, VAccess::WRITE},
new AstAdd{flp, readRefp->cloneTree(false), new AstConst{flp, 1}}};
currWhilep->addStmtsp(currIncrp);
}
}
// To use these statements for __En initialization, replace references to __Rd with
// ones to __En and replace assignments RHS with 0
AstNodeStmt* const enInitStmtsp = rdUpdateStmtsp->cloneTree(true);
for (size_t i = 0; i < assigns.size(); i++) {
// Save copies, because clonep() works only after the last cloneTree
assigns[i] = assigns[i]->clonep();
}
V3Number zero{m_enVscp, m_enVscp->width()};
AstNodeExpr* const enRhsp = new AstConst{flp, zero};
AstNodeExpr* enLhsp = applySelects(enRefp, loopVarRefs);
AstNodeStmt* stmtp = new AstAssign{flp, enLhsp, enRhsp};
if (toInsertp) {
toInsertp->addNextHere(stmtp);
stmtp = outerStmtp;
for (AstAssign* const assignp : assigns) {
AstVarRef* const lhsVarRefp
= VN_AS(AstNodeVarRef::varRefLValueRecurse(assignp->lhsp()), VarRef);
lhsVarRefp->replaceWith(new AstVarRef{flp, m_enVscp, VAccess::WRITE});
lhsVarRefp->deleteTree();
assignp->rhsp()->unlinkFrBack()->deleteTree();
V3Number zero{m_enVscp, assignp->lhsp()->dtypep()->width()};
assignp->rhsp(new AstConst{flp, zero});
}
activeInitp->addStmtsp(new AstInitial{flp, stmtp->cloneTree(true)});
activeInitp->addStmtsp(new AstInitial{flp, enInitStmtsp});
{ // Add the combinational override
// Explicitly list dependencies for update.
// Note: rdVscp is also needed to retrigger assignment for the first time.
@ -167,48 +137,105 @@ public:
= new AstActive{flp, "force-update", new AstSenTree{flp, itemsp}};
activep->senTreeStorep(activep->sentreep());
// Reuse the statements created for __VforceEn initialization
// and replace var ref on the LHS and the RHS
AstVarRef* const rdRefp = new AstVarRef{flp, m_rdVscp, VAccess::WRITE};
AstNodeExpr* const rdRhsp = forcedUpdate(vscp, loopVarRefs);
enRefp->replaceWith(rdRefp);
VL_DO_DANGLING(enRefp->deleteTree(), enRefp);
enRhsp->replaceWith(rdRhsp);
VL_DO_DANGLING(enRhsp->deleteTree(), enRhsp);
activep->addStmtsp(new AstAlways{flp, VAlwaysKwd::ALWAYS, nullptr, stmtp});
activep->addStmtsp(
new AstAlways{flp, VAlwaysKwd::ALWAYS, nullptr, rdUpdateStmtsp});
vscp->scopep()->addBlocksp(activep);
}
}
static AstNodeExpr* applySelects(AstNodeExpr* exprp,
const std::vector<AstNodeExpr*>& selectExprs) {
for (AstNodeExpr* const sp : selectExprs) {
exprp = new AstArraySel{exprp->fileline(), exprp, sp->cloneTreePure(false)};
AstNodeStmt* getForcedUpdateStmtsRecursep(AstNodeExpr* const lhsp, AstVarScope* const vscp,
AstVarRef* const lhsVarRefp,
std::vector<AstAssign*>& assigns) {
// Create stataments that update values of __Rd variable.
// lhsp is either a reference to that variable or ArraySel or MemberSel on it.
// lhsVarRefp is a reference to that variable in lhsp subtree.
// assigns is a vector to which all assignments to __Rd are added.
FileLine* const flp = lhsp->fileline();
const AstNodeDType* const lhsDtypep = lhsp->dtypep()->skipRefp();
if (lhsDtypep->isIntegralOrPacked() || VN_IS(lhsDtypep, BasicDType)) {
AstAssign* const assignp
= new AstAssign{flp, lhsp, forcedUpdate(vscp, lhsp, lhsVarRefp)};
assigns.push_back(assignp);
return assignp;
} else if (const AstStructDType* const structDtypep
= VN_CAST(lhsDtypep, StructDType)) {
AstNodeStmt* stmtsp = nullptr;
bool firstIter = true;
for (AstMemberDType* mdtp = structDtypep->membersp(); mdtp;
mdtp = VN_AS(mdtp->nextp(), MemberDType)) {
AstNodeExpr* const lhsCopyp = firstIter ? lhsp : lhsp->cloneTreePure(false);
AstVarRef* const lhsVarRefCopyp
= firstIter ? lhsVarRefp : lhsVarRefp->clonep();
AstStructSel* const structSelp = new AstStructSel{flp, lhsCopyp, mdtp->name()};
structSelp->dtypep(mdtp);
AstNodeStmt* const memberStmtp
= getForcedUpdateStmtsRecursep(structSelp, vscp, lhsVarRefCopyp, assigns);
stmtsp = firstIter ? memberStmtp : stmtsp->addNext(memberStmtp);
firstIter = false;
}
return stmtsp;
} else if (const AstUnpackArrayDType* const arrayDtypep
= VN_CAST(lhsDtypep, UnpackArrayDType)) {
AstVar* const loopVarp
= new AstVar{flp, VVarType::MODULETEMP,
m_iterNames.get(m_rdVscp->varp()->name()), VFlagBitPacked{}, 32};
m_rdVscp->varp()->addNext(loopVarp);
AstVarScope* const loopVarScopep
= new AstVarScope{flp, m_rdVscp->scopep(), loopVarp};
m_rdVscp->addNext(loopVarScopep);
AstVarRef* const readRefp = new AstVarRef{flp, loopVarScopep, VAccess::READ};
AstNodeStmt* const currInitp = new AstAssign{
flp, new AstVarRef{flp, loopVarScopep, VAccess::WRITE}, new AstConst{flp, 0}};
AstLoop* const currWhilep = new AstLoop{flp};
currInitp->addNextHere(currWhilep);
AstLoopTest* const loopTestp = new AstLoopTest{
flp, currWhilep,
new AstNeq{
flp, readRefp,
new AstConst{flp, static_cast<uint32_t>(arrayDtypep->elementsConst())}}};
currWhilep->addStmtsp(loopTestp);
AstArraySel* const lhsSelp
= new AstArraySel{flp, lhsp, readRefp->cloneTree(false)};
AstNodeStmt* const loopBodyp
= getForcedUpdateStmtsRecursep(lhsSelp, vscp, lhsVarRefp, assigns);
currWhilep->addStmtsp(loopBodyp);
AstAssign* const currIncrp = new AstAssign{
flp, new AstVarRef{flp, loopVarScopep, VAccess::WRITE},
new AstAdd{flp, readRefp->cloneTree(false), new AstConst{flp, 1}}};
currWhilep->addStmtsp(currIncrp);
return currInitp;
} else {
lhsDtypep->v3fatalSrc("Unhandled type");
}
return exprp;
}
AstNodeExpr* forcedUpdate(AstVarScope* const vscp,
const std::vector<AstNodeExpr*>& selectExprs) const {
static AstNodeExpr* wrapIntoExprp(AstVarRef* const refp, AstNodeExpr* const exprp,
AstVarRef* const varRefToReplacep) {
// Return a copy of exprp in which varRefToReplacep is replaced with refp
if (exprp == varRefToReplacep) {
return refp;
} else {
AstNodeExpr* const copiedExprp = exprp->cloneTreePure(false);
AstNode* const oldRefp = varRefToReplacep->clonep();
varRefToReplacep->clonep()->replaceWith(refp);
oldRefp->deleteTree();
return copiedExprp;
}
}
AstNodeExpr* forcedUpdate(AstVarScope* const vscp, AstNodeExpr* exprp = nullptr,
AstVarRef* const varRefToReplacep = nullptr) const {
FileLine* const flp = vscp->fileline();
AstVarRef* origRefp = new AstVarRef{flp, vscp, VAccess::READ};
ForceState::markNonReplaceable(origRefp);
AstNodeExpr* const origp = applySelects(origRefp, selectExprs);
AstNodeExpr* const origExprp = wrapIntoExprp(origRefp, exprp, varRefToReplacep);
AstNodeExpr* const enExprp = wrapIntoExprp(new AstVarRef{flp, m_enVscp, VAccess::READ},
exprp, varRefToReplacep);
AstNodeExpr* const valExprp = wrapIntoExprp(
new AstVarRef{flp, m_valVscp, VAccess::READ}, exprp, varRefToReplacep);
if (ForceState::isRangedDType(vscp)) {
return new AstOr{
flp,
new AstAnd{
flp,
applySelects(new AstVarRef{flp, m_enVscp, VAccess::READ}, selectExprs),
applySelects(new AstVarRef{flp, m_valVscp, VAccess::READ}, selectExprs)},
new AstAnd{
flp,
new AstNot{flp, applySelects(new AstVarRef{flp, m_enVscp, VAccess::READ},
selectExprs)},
origp}};
flp, new AstAnd{flp, enExprp, valExprp},
new AstAnd{flp, new AstNot{flp, enExprp->cloneTreePure(false)}, origExprp}};
}
return new AstCond{
flp, applySelects(new AstVarRef{flp, m_enVscp, VAccess::READ}, selectExprs),
applySelects(new AstVarRef{flp, m_valVscp, VAccess::READ}, selectExprs), origp};
return new AstCond{flp, enExprp, valExprp, origExprp};
}
};
@ -229,39 +256,52 @@ private:
m_valVscps;
// `valVscp` force components of a forced RHS
static AstNodeDType* getEnVarpDTypep(AstVar* const varp) {
static size_t checkIfDTypeSupportedRecurse(const AstNodeDType* const dtypep,
const AstVar* const varp) {
// Checks if force stmt is supported on all subtypes
// and returns number of unpacked elements
const AstNodeDType* const dtp = dtypep->skipRefp();
if (const AstUnpackArrayDType* const udtp = VN_CAST(dtp, UnpackArrayDType)) {
const size_t elemsInSubDType = checkIfDTypeSupportedRecurse(udtp->subDTypep(), varp);
return udtp->elementsConst() * elemsInSubDType;
} else if (const AstNodeUOrStructDType* const sdtp = VN_CAST(dtp, NodeUOrStructDType)) {
size_t elemCount = 0;
for (const AstMemberDType* mdtp = sdtp->membersp(); mdtp;
mdtp = VN_AS(mdtp->nextp(), MemberDType)) {
elemCount += checkIfDTypeSupportedRecurse(mdtp->subDTypep(), varp);
}
return elemCount;
} else if (const AstBasicDType* const bdtp = VN_CAST(dtp, BasicDType)) {
if (bdtp->isString() || bdtp->isEvent() || bdtp->keyword() == VBasicDTypeKwd::CHANDLE
|| bdtp->keyword() == VBasicDTypeKwd::TIME) {
varp->v3warn(E_UNSUPPORTED, "Forcing variable of unsupported type: "
<< varp->dtypep()->prettyTypeName());
}
return 1;
} else if (!dtp->isIntegralOrPacked()) {
varp->v3warn(E_UNSUPPORTED, "Forcing variable of unsupported type: "
<< varp->dtypep()->prettyTypeName());
return 1;
} else {
// All packed types are supported
return 1;
}
}
static AstNodeDType* getEnVarpDTypep(const AstVar* const varp) {
AstNodeDType* const origDTypep = varp->dtypep()->skipRefp();
const size_t unpackElemNum = checkIfDTypeSupportedRecurse(origDTypep, varp);
if (unpackElemNum > ELEMENTS_MAX) {
varp->v3warn(E_UNSUPPORTED, "Unsupported: Force of variable with "
">= "
<< ELEMENTS_MAX << " unpacked elements");
}
if (VN_IS(origDTypep, UnpackArrayDType)) {
size_t elemNum = 1;
AstNodeDType* dtp = origDTypep;
while (AstUnpackArrayDType* const uDtp = VN_CAST(dtp, UnpackArrayDType)) {
dtp = uDtp->subDTypep()->skipRefp();
elemNum *= uDtp->elementsConst();
}
if (elemNum > ELEMENTS_MAX) {
varp->v3warn(E_UNSUPPORTED, "Unsupported: Force of unpacked array variable with "
">= "
<< ELEMENTS_MAX << " elements");
}
bool complexElem = true;
if (const AstBasicDType* const basicp = VN_CAST(dtp, BasicDType)) {
complexElem = basicp->isOpaque();
}
if (complexElem) {
varp->v3warn(E_UNSUPPORTED, "Unsupported: Force of unpacked array variable with "
"elements of complex data type");
}
return origDTypep;
} else if (VN_IS(origDTypep, BasicDType)) {
return isRangedDType(varp) ? origDTypep : varp->findBitDType();
} else if (VN_IS(origDTypep, PackArrayDType)) {
return origDTypep;
} else if (const AstNodeUOrStructDType* const sdtp
= VN_CAST(origDTypep, NodeUOrStructDType)) {
if (!sdtp->packed()) {
varp->v3warn(E_UNSUPPORTED,
"Unsupported: Force of unpacked struct / union variable");
}
} else if (VN_IS(origDTypep, NodeUOrStructDType)) {
return origDTypep;
} else {
varp->v3fatalSrc("Unsupported: Force of variable of unhandled data type");
@ -275,7 +315,7 @@ public:
VL_UNCOPYABLE(ForceState);
// STATIC METHODS
static bool isRangedDType(AstNode* nodep) {
static bool isRangedDType(const AstNode* const nodep) {
// If ranged we need a multibit enable to support bit-by-bit part-select forces,
// otherwise forcing a real or other opaque dtype and need a single bit enable.
const AstBasicDType* const basicp = nodep->dtypep()->skipRefp()->basicp();
@ -416,26 +456,14 @@ class ForceConvertVisitor final : public VNVisitor {
}
});
// Replace write refs on RHS
if (VN_IS(resetRdp->rhsp(), ArraySel)) {
std::vector<AstNodeExpr*> selIndices;
AstNodeExpr* exprp = resetRdp->rhsp();
while (AstArraySel* const selp = VN_CAST(exprp, ArraySel)) {
selIndices.push_back(selp->bitp());
exprp = selp->fromp();
}
if (AstVarRef* const refp = VN_CAST(exprp, VarRef)) {
AstVarScope* const vscp = refp->varScopep();
std::vector<AstNodeExpr*> reversedIndices(selIndices.size());
std::reverse_copy(selIndices.begin(), selIndices.end(), reversedIndices.begin());
AstNodeExpr* const origRhsp = resetRdp->rhsp();
origRhsp->replaceWith(
m_state.getForceComponents(vscp).forcedUpdate(vscp, reversedIndices));
VL_DO_DANGLING(origRhsp->deleteTree(), origRhsp);
} else {
exprp->v3warn(
E_UNSUPPORTED,
"Unsupported: Release statement argument is too complex array select");
}
if (VN_IS(resetRdp->rhsp(), ArraySel) || VN_IS(resetRdp->rhsp(), StructSel)) {
AstVarRef* const refp
= VN_AS(AstNodeVarRef::varRefLValueRecurse(resetRdp->rhsp()), VarRef);
AstVarScope* const vscp = refp->varScopep();
AstNodeExpr* const origRhsp = resetRdp->rhsp();
origRhsp->replaceWith(
m_state.getForceComponents(vscp).forcedUpdate(vscp, origRhsp, refp));
VL_DO_DANGLING(origRhsp->deleteTree(), origRhsp);
} else {
resetRdp->rhsp()->foreach([this](AstVarRef* refp) {
if (refp->access() != VAccess::WRITE) return;
@ -444,7 +472,7 @@ class ForceConvertVisitor final : public VNVisitor {
refp->access(VAccess::READ);
ForceState::markNonReplaceable(refp);
} else {
refp->replaceWith(m_state.getForceComponents(vscp).forcedUpdate(vscp, {}));
refp->replaceWith(m_state.getForceComponents(vscp).forcedUpdate(vscp));
VL_DO_DANGLING(refp->deleteTree(), refp);
}
});
@ -493,7 +521,6 @@ class ForceReplaceVisitor final : public VNVisitor {
AstNodeStmt* m_stmtp = nullptr;
bool m_inLogic = false;
bool m_releaseRhs = false; // Inside RHS of assignment created for release statement
std::vector<AstNodeExpr*> m_selIndices; // Indices of array select expressions above
// METHODS
void iterateLogic(AstNode* logicp) {
@ -529,12 +556,6 @@ class ForceReplaceVisitor final : public VNVisitor {
iterateLogic(nodep);
}
void visit(AstSenItem* nodep) override { iterateLogic(nodep); }
void visit(AstArraySel* nodep) override {
m_selIndices.push_back(nodep->bitp());
iterateChildren(nodep);
UASSERT_OBJ(m_selIndices.size(), nodep, "Underflow");
m_selIndices.pop_back();
}
void visit(AstVarRef* nodep) override {
if (ForceState::isNotReplaceable(nodep)) return;
@ -554,12 +575,26 @@ class ForceReplaceVisitor final : public VNVisitor {
if (ForceState::ForceComponentsVarScope* const fcp
= m_state.tryGetForceComponents(nodep)) {
FileLine* const flp = nodep->fileline();
std::vector<AstNodeExpr*> reversedIndices(m_selIndices.size());
std::reverse_copy(m_selIndices.begin(), m_selIndices.end(),
reversedIndices.begin());
AstNodeExpr* const lhsp = ForceState::ForceComponentsVarScope::applySelects(
new AstVarRef{flp, fcp->m_rdVscp, VAccess::WRITE}, reversedIndices);
AstNodeExpr* const rhsp = fcp->forcedUpdate(nodep->varScopep(), reversedIndices);
AstVarRef* const lhsRefp = new AstVarRef{flp, fcp->m_rdVscp, VAccess::WRITE};
AstNodeExpr* lhsp;
AstNodeExpr* rhsp;
if (nodep->dtypep()->skipRefp()->isIntegralOrPacked()) {
rhsp = fcp->forcedUpdate(nodep->varScopep());
lhsp = lhsRefp;
} else {
AstNodeExpr* wholeExprp = nodep;
while (VN_IS(wholeExprp->backp(), NodeExpr)) {
wholeExprp = VN_AS(wholeExprp->backp(), NodeExpr);
// wholeExprp should never be ExprStmt, because:
// * if nodep is inside stmtsp() of one, we should sooner get NodeStmt node
// * nodep should never be in resultp(), because it is a WRITE reference
// and resultp() should be an rvalue
UASSERT_OBJ(!VN_IS(wholeExprp, ExprStmt), nodep, "Unexpected AstExprStmt");
}
lhsp = ForceState::ForceComponentsVarScope::wrapIntoExprp(lhsRefp, wholeExprp,
nodep);
rhsp = fcp->forcedUpdate(nodep->varScopep(), wholeExprp, nodep);
}
m_stmtp->addNextHere(new AstAssign{flp, lhsp, rhsp});
}
// Emit valVscp update after each write to any VarRef on forced RHS.

8
test_regress/t/t_force_readwrite_unsup.out
View File

@ -1,8 +1,8 @@
%Error-UNSUPPORTED: t/t_force_readwrite_unsup.v:25:18: Unsupported: Signals used via read-write reference cannot be forced
25 | cls.take_ref(a);
%Error-UNSUPPORTED: t/t_force_readwrite_unsup.v:19:18: Unsupported: Signals used via read-write reference cannot be forced
19 | cls.take_ref(a);
| ^
... For error description see https://verilator.org/warn/UNSUPPORTED?v=latest
%Error-UNSUPPORTED: t/t_force_readwrite_unsup.v:26:18: Unsupported: Signals used via read-write reference cannot be forced
26 | cls.take_ref(b);
%Error-UNSUPPORTED: t/t_force_readwrite_unsup.v:20:18: Unsupported: Signals used via read-write reference cannot be forced
20 | cls.take_ref(b);
| ^
%Error: Exiting due to

6
test_regress/t/t_force_readwrite_unsup.v
View File

@ -4,12 +4,6 @@
// SPDX-FileCopyrightText: 2025 Antmicro
// SPDX-License-Identifier: CC0-1.0
// DESCRIPTION: Verilator: Verilog Test module
//
// This file ONLY is placed under the Creative Commons Public Domain
// SPDX-FileCopyrightText: 2025 Antmicro
// SPDX-License-Identifier: CC0-1.0
class Cls;
task take_ref(ref logic s);
endtask

18
test_regress/t/t_force_unpacked_struct.py Executable file
View File

@ -0,0 +1,18 @@
#!/usr/bin/env python3
# DESCRIPTION: Verilator: Verilog Test driver/expect definition
#
# This program is free software; you can redistribute it and/or modify it
# under the terms of either the GNU Lesser General Public License Version 3
# or the Perl Artistic License Version 2.0.
# SPDX-FileCopyrightText: 2026 Wilson Snyder
# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
import vltest_bootstrap
test.scenarios('simulator')
test.compile()
test.execute()
test.passes()

83
test_regress/t/t_force_unpacked_struct.v Normal file
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@ -0,0 +1,83 @@
// DESCRIPTION: Verilator: Verilog Test module
//
// This file ONLY is placed under the Creative Commons Public Domain.
// SPDX-FileCopyrightText: 2026 Antmicro
// SPDX-License-Identifier: CC0-1.0
// verilog_format: off
`define stop $stop
`define checkh(gotv,expv) do if ((gotv) !== (expv)) begin $write("%%Error: %s:%0d: got='h%x exp='h%x\n", `__FILE__,`__LINE__, (gotv), (expv)); `stop; end while(0)
`define checkr(gotv,expv) do if ((gotv) != (expv)) begin $write("%%Error: %s:%0d: got=%f exp=%f\n", `__FILE__,`__LINE__, (gotv), (expv)); `stop; end while(0);
// verilog_format: on
module t (
input clk
);
integer cyc = 0;
typedef struct {
int x;
logic y;
int arr[5];
} struct_t;
struct_t s_array[3];
struct_t my_struct;
// Test loop
always @(posedge clk) begin
cyc <= cyc + 1;
if (cyc == 0) begin
s_array[1].x = 1;
s_array[1].arr[2] = 1;
my_struct.x <= 1;
end
else if (cyc == 1) begin
`checkh(s_array[1].x, 1);
`checkh(s_array[1].arr[2], 1);
`checkh(my_struct.x, 1);
end
else if (cyc == 2) begin
force s_array[1].x = 0;
force s_array[1].arr[2] = 2;
force my_struct.x = 0;
end
else if (cyc == 3) begin
`checkh(s_array[1].x, 0);
s_array[1].x = 1;
`checkh(s_array[1].arr[2], 2);
s_array[1].arr[2] = 3;
`checkh(my_struct.x, 0);
my_struct.x <= 1;
end
else if (cyc == 4) begin
`checkh(s_array[1].x, 0);
`checkh(s_array[1].arr[2], 2);
`checkh(my_struct.x, 0);
end
else if (cyc == 5) begin
release s_array[1].x;
release s_array[1].arr[2];
release my_struct.x;
end
else if (cyc == 6) begin
`checkh(s_array[1].x, 0);
s_array[1].x = 1;
`checkh(s_array[1].arr[2], 2);
s_array[1].arr[2] = 4;
`checkh(my_struct.x, 0);
my_struct.x <= 1;
end
else if (cyc == 7) begin
`checkh(s_array[1].x, 1);
`checkh(s_array[1].arr[2], 4);
`checkh(my_struct.x, 1);
end
else if (cyc == 8) begin
$write("*-* All Finished *-*\n");
$finish;
end
end
endmodule

15
test_regress/t/t_force_unpacked_unsup.out
View File

@ -1,17 +1,8 @@
%Error-UNSUPPORTED: t/t_force_unpacked_unsup.v:23:8: Unsupported: Force of unpacked array variable with elements of complex data type
23 | real r_array[2];
| ^~~~~~~
... For error description see https://verilator.org/warn/UNSUPPORTED?v=latest
%Error-UNSUPPORTED: t/t_force_unpacked_unsup.v:22:7: Unsupported: Force of unpacked array variable with >= 1000 elements
%Error-UNSUPPORTED: t/t_force_unpacked_unsup.v:22:7: Unsupported: Force of variable with >= 1000 unpacked elements
22 | bit big_array[40][40][40];
| ^~~~~~~~~
%Error-UNSUPPORTED: t/t_force_unpacked_unsup.v:21:12: Unsupported: Force of unpacked array variable with >= 1000 elements
... For error description see https://verilator.org/warn/UNSUPPORTED?v=latest
%Error-UNSUPPORTED: t/t_force_unpacked_unsup.v:21:12: Unsupported: Force of variable with >= 1000 unpacked elements
21 | struct_t s_array[3000];
| ^~~~~~~
%Error-UNSUPPORTED: t/t_force_unpacked_unsup.v:21:12: Unsupported: Force of unpacked array variable with elements of complex data type
21 | struct_t s_array[3000];
| ^~~~~~~
%Error-UNSUPPORTED: t/t_force_unpacked_unsup.v:24:12: Unsupported: Force of unpacked struct / union variable
24 | struct_t my_struct;
| ^~~~~~~~~
%Error: Exiting due to

13
test_regress/t/t_force_unpacked_unsup.v
View File

@ -1,7 +1,7 @@
// DESCRIPTION: Verilator: Verilog Test module
//
// This file ONLY is placed under the Creative Commons Public Domain
// SPDX-FileCopyrightText: 2025 Antmicro
// SPDX-FileCopyrightText: 2026 Antmicro
// SPDX-License-Identifier: CC0-1.0
// verilog_format: off
@ -21,7 +21,6 @@ module t (
struct_t s_array[3000];
bit big_array[40][40][40];
real r_array[2];
struct_t my_struct;
// Test loop
always @(posedge clk) begin
@ -30,19 +29,16 @@ module t (
r_array[0] <= 1;
big_array[1][2][3] <= 1;
s_array[1].x <= 1;
my_struct.x <= 1;
end
else if (cyc == 1) begin
`checkr(r_array[0], 1);
`checkr(big_array[1][2][3], 1);
`checkh(s_array[1].x, 1);
`checkh(my_struct.x, 1);
end
else if (cyc == 2) begin
force r_array[0] = 0;
force big_array[1][2][3] = 0;
force s_array[1].x = 0;
force my_struct.x = 0;
end
else if (cyc == 3) begin
`checkr(r_array[0], 0);
@ -51,20 +47,16 @@ module t (
big_array[1][2][3] <= 1;
`checkh(s_array[1].x, 0);
s_array[1].x <= 1;
`checkh(my_struct.x, 0);
my_struct.x <= 1;
end
else if (cyc == 4) begin
`checkr(r_array[0], 0);
`checkr(big_array[1][2][3], 0);
`checkh(s_array[1].x, 0);
`checkh(my_struct.x, 0);
end
else if (cyc == 5) begin
release r_array[0];
release big_array[1][2][3];
release s_array[1].x;
release my_struct.x;
end
else if (cyc == 6) begin
`checkr(r_array[0], 0);
@ -73,14 +65,11 @@ module t (
big_array[1][2][3] <= 1;
`checkh(s_array[1].x, 0);
s_array[1].x <= 1;
`checkh(my_struct.x, 0);
my_struct.x <= 1;
end
else if (cyc == 7) begin
`checkr(r_array[0], 1);
`checkr(big_array[1][2][3], 1);
`checkh(s_array[1].x, 1);
`checkh(my_struct.x, 1);
end
else if (cyc == 8) begin
$write("*-* All Finished *-*\n");

4
test_regress/t/t_forceable_string_bad.out
View File

@ -2,4 +2,8 @@
8 | string str /*verilator forceable*/;
| ^~~
... See the manual at https://verilator.org/verilator_doc.html?v=latest for more assistance.
%Error-UNSUPPORTED: t/t_forceable_string_bad.v:8:10: Forcing variable of unsupported type: BASICDTYPE 'string'
8 | string str /*verilator forceable*/;
| ^~~
... For error description see https://verilator.org/warn/UNSUPPORTED?v=latest
%Error: Exiting due to