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Support ++/-- on dotted member variables.

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This commit is contained in:
Wilson Snyder
2023-04-07 20:57:17 -04:00
parent 827cbf22c9
commit d67d75282c
8 changed files with 191 additions and 14 deletions
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src/V3LinkInc.cpp
+12 -11
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@@ -240,11 +240,12 @@ private:
return;
}
const AstNodeVarRef* varrefp = nullptr;
if (m_unsupportedHere || !(varrefp = VN_CAST(nodep->rhsp(), VarRef))) {
if (m_unsupportedHere) {
nodep->v3warn(E_UNSUPPORTED, "Unsupported: Incrementation in this context.");
return;
}
AstNodeExpr* const readp = nodep->rhsp();
AstNodeExpr* const writep = nodep->thsp();
AstConst* const constp = VN_AS(nodep->lhsp(), Const);
UASSERT_OBJ(nodep, constp, "Expecting CONST");
@@ -254,8 +255,9 @@ private:
// Prepare a temporary variable
FileLine* const fl = backp->fileline();
const string name = string{"__Vincrement"} + cvtToStr(++m_modIncrementsNum);
AstVar* const varp = new AstVar{fl, VVarType::BLOCKTEMP, name, VFlagChildDType{},
varrefp->varp()->subDTypep()->cloneTree(true)};
AstVar* const varp = new AstVar{
fl, VVarType::BLOCKTEMP, name, VFlagChildDType{},
new AstRefDType{fl, AstRefDType::FlagTypeOfExpr{}, readp->cloneTree(true)}};
if (m_ftaskp) varp->funcLocal(true);
// Declare the variable
@@ -264,30 +266,29 @@ private:
// Define what operation will we be doing
AstNodeExpr* operp;
if (VN_IS(nodep, PostSub) || VN_IS(nodep, PreSub)) {
operp = new AstSub{fl, new AstVarRef{fl, varrefp->varp(), VAccess::READ}, newconstp};
operp = new AstSub{fl, readp->cloneTree(true), newconstp};
} else {
operp = new AstAdd{fl, new AstVarRef{fl, varrefp->varp(), VAccess::READ}, newconstp};
operp = new AstAdd{fl, readp->cloneTree(true), newconstp};
}
if (VN_IS(nodep, PreAdd) || VN_IS(nodep, PreSub)) {
// PreAdd/PreSub operations
// Immediately after declaration - increment it by one
varp->addNextHere(new AstAssign{fl, new AstVarRef{fl, varrefp->varp(), VAccess::WRITE},
varp->addNextHere(new AstAssign{fl, writep->cloneTree(true),
new AstVarRef{fl, varp, VAccess::READ}});
// Immediately after incrementing - assign it to the original variable
varp->addNextHere(new AstAssign{fl, new AstVarRef{fl, varp, VAccess::WRITE}, operp});
} else {
// PostAdd/PostSub operations
// assign the original variable to the temporary one
varp->addNextHere(
new AstAssign{fl, new AstVarRef{fl, varrefp->varp(), VAccess::WRITE}, operp});
varp->addNextHere(new AstAssign{fl, writep->cloneTree(true), operp});
// Increment the original variable by one
varp->addNextHere(new AstAssign{fl, new AstVarRef{fl, varp, VAccess::WRITE},
new AstVarRef{fl, varrefp->varp(), VAccess::READ}});
readp->cloneTree(true)});
}
// Replace the node with the temporary
nodep->replaceWith(new AstVarRef{varrefp->fileline(), varp, VAccess::READ});
nodep->replaceWith(new AstVarRef{readp->fileline(), varp, VAccess::READ});
VL_DO_DANGLING(nodep->deleteTree(), nodep);
}
void visit(AstPreAdd* nodep) override { prepost_visit(nodep); }