work around missing entries in function symbol table

Penguinwizzard · Penguinwizzard · commit 58efb7f61dc7 · 2018-05-16T11:27:46.000-07:00
diff --git a/lib/Backend/BackwardPass.cpp b/lib/Backend/BackwardPass.cpp
@@ -3227,9 +3227,11 @@ BackwardPass::ProcessBlock(BasicBlock * block)
                     loop->symClusterList->MapSet<BVSparse<JitArenaAllocator>*>(symID, [](SymID a, BVSparse<JitArenaAllocator> *symbols) {
                         symbols->Set(a);
                     }, syms);
+                    SymTable* symTable = loop->GetFunc()->m_symTable;
                     FOREACH_BITSET_IN_SPARSEBV(curSymID, syms)
                     {
-                        if (!loop->GetFunc()->m_symTable->Find(curSymID)->IsStackSym())
+                        Sym* potentialSym = symTable->Find(curSymID);
+                        if (potentialSym == nullptr || !potentialSym->IsStackSym())
                         {
                             syms->Clear(curSymID);
                         }

Original file line number	Diff line number	Diff line change
`@@ -3227,9 +3227,11 @@ BackwardPass::ProcessBlock(BasicBlock * block)`
`3227`	`3227`	`loop->symClusterList->MapSet<BVSparse<JitArenaAllocator>>(symID, [](SymID a, BVSparse<JitArenaAllocator> symbols) {`
`3228`	`3228`	`symbols->Set(a);`
`3229`	`3229`	`}, syms);`
	`3230`	`+ SymTable* symTable = loop->GetFunc()->m_symTable;`
`3230`	`3231`	`FOREACH_BITSET_IN_SPARSEBV(curSymID, syms)`
`3231`	`3232`	`{`
`3232`		`- if (!loop->GetFunc()->m_symTable->Find(curSymID)->IsStackSym())`
	`3233`	`+ Sym* potentialSym = symTable->Find(curSymID);`
	`3234`	`+ if (potentialSym == nullptr \|\| !potentialSym->IsStackSym())`
`3233`	`3235`	`{`
`3234`	`3236`	`syms->Clear(curSymID);`
`3235`	`3237`	`}`