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Internals: Tristate common pull setter. No functional change

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This commit is contained in:
Wilson Snyder 2012-05-05 15:03:00 -04:00
parent 2c9e2b2e3c
commit 86af244636
1 changed files with 12 additions and 12 deletions
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22
src/V3Tristate.cpp
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@ -182,10 +182,15 @@ class TristateVisitor : public TristateBaseVisitor {
return newp;
}
void checkPullDirection(AstPull* pullp1, AstPull* pullp2) {
if (pullp1 && pullp2 && pullp1->direction() != pullp2->direction()) {
pullp1->v3error("Unsupported: Conflicting pull directions.");
pullp2->v3error("... Location of conflicing pull.");
void setPullDirection(AstVar* varp, AstPull* pullp) {
AstPull* oldpullp = (AstPull*)varp->user3p();
if (!oldpullp) {
varp->user3p(pullp); //save off to indicate the pull direction
} else {
if (oldpullp->direction() != pullp->direction()) {
pullp->v3error("Unsupported: Conflicting pull directions.");
oldpullp->v3error("... Location of conflicing pull.");
}
}
}
@ -638,8 +643,7 @@ class TristateVisitor : public TristateBaseVisitor {
AstVarRef* lhsp = nodep->lhsp()->unlinkFrBack()->castVarRef();
lhsp->lvalue(true);
AstVar* varp = lhsp->varp();
AstPull* pullp = (AstPull*)varp->user3p();
checkPullDirection(pullp, nodep);
setPullDirection(varp, nodep);
V3Number zeros (nodep->fileline(), varp->width());
zeros.setAllBits0();
AstConst* constp = new AstConst(nodep->fileline(), zeros);
@ -758,12 +762,8 @@ class TristateVisitor : public TristateBaseVisitor {
if (refp) {
if (AstPull* pullp = (AstPull*) nodep->modVarp()->user3p()) {
UINFO(9, "propagate pull to "<<refp->varp());
if (!refp->varp()->user3p()) {
refp->varp()->user3p(pullp);
} else {
//selp: Note we don't currently obey selects; all bits must be consistently pulled
checkPullDirection(pullp, (AstPull*) refp->varp()->user3p());
}
setPullDirection(refp->varp(), pullp);
}
}
// Don't need to visit the created assigns, as it was added at the end of the next links