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Detect MSB overflow when under VL_DEBUG, bug1238.

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This commit is contained in:
Wilson Snyder
2017-11-05 21:47:55 -05:00
parent 4d074b5414
commit cbb7cd16d0
12 changed files with 159 additions and 4 deletions
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src/V3CCtors.cpp
+40
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@@ -23,6 +23,8 @@
// for all AstCoverDecl, move the declaration into a _configure_coverage AstCFunc.
// For each variable that needs reset, add a AstCReset node.
//
// For primary inputs, add _eval_debug_assertions.
//
// This transformation honors outputSplitCFuncs.
//*************************************************************************
#include "config_build.h"
@@ -101,8 +103,46 @@ private:
//######################################################################
void V3CCtors::evalAsserts() {
AstNodeModule* modp = v3Global.rootp()->modulesp(); // Top module
AstCFunc* funcp = new AstCFunc(modp->fileline(), "_eval_debug_assertions", NULL, "void");
funcp->declPrivate(true);
funcp->isStatic(false);
funcp->slow(false);
funcp->ifdef("VL_DEBUG");
modp->addStmtp(funcp);
for (AstNode* np = modp->stmtsp(); np; np = np->nextp()) {
if (AstVar* varp = np->castVar()) {
if (varp->isPrimaryIn() && !varp->isSc()) {
if (AstBasicDType* basicp = varp->dtypeSkipRefp()->castBasicDType()) {
int storedWidth = basicp->widthAlignBytes() * 8;
int lastWordWidth = varp->width() % storedWidth;
if (lastWordWidth != 0) {
// if (signal & CONST(upper_non_clean_mask)) { fail; }
AstNode* newp = new AstVarRef(varp->fileline(), varp, false);
if (varp->isWide()) {
newp = new AstWordSel(varp->fileline(), newp,
new AstConst(varp->fileline(), varp->widthWords()-1));
}
uint64_t value = VL_MASK_Q(storedWidth) & ~VL_MASK_Q(lastWordWidth);
V3Number num (varp->fileline(), storedWidth, value);
newp = new AstAnd(varp->fileline(), newp,
new AstConst(varp->fileline(), num));
AstNodeIf* ifp = new AstIf(varp->fileline(), newp,
new AstCStmt(varp->fileline(), "Verilated::overWidthError(\""+varp->prettyName()+"\");"));
ifp->branchPred(AstBranchPred::BP_UNLIKELY);
newp = ifp;
funcp->addStmtsp(newp);
}
}
}
}
}
}
void V3CCtors::cctorsAll() {
UINFO(2,__FUNCTION__<<": "<<endl);
evalAsserts();
for (AstNodeModule* modp = v3Global.rootp()->modulesp(); modp; modp=modp->nextp()->castNodeModule()) {
// Process each module in turn
{