[cfe-dev] ASTContext::getParents returning empty list
Kevin Choi via cfe-dev
cfe-dev at lists.llvm.org
Tue Oct 23 03:49:21 PDT 2018
Hi clang developers,
I wasn't sure if this was the relevant channel to ask this, and I
apologize if so.
I've hit a puzzle with an out-of-tree build based on 6.0.0 and was
wondering if anyone could share their wisdom on it.
ASTContext::getParents seems to be returning an empty list in a
particular case:
Run on ArraySubscriptExpr node looking for Stmt parents.
I have four ArraySubscriptExprs in my AST dump, the faulty one being:
|-FunctionDecl 0x6190f58 <line:33:1, line:35:1> line:33:5 used fib 'int
(int)'$
| |-ParmVarDecl 0x6190ec8 <col:9, col:13> col:13 used n 'int'$
| `-CompoundStmt 0x61915d8 <col:16, line:35:1>$
| `-ReturnStmt 0x6191518 <line:34:3, col:13>$
| `-ImplicitCastExpr 0x6191460 <col:10, col:13> 'int' <LValueToRValue>$
| `-ArraySubscriptExpr 0x6191390 <col:10, col:13> 'int' lvalue$
| |-ImplicitCastExpr 0x6191220 <col:10> 'int *'
<ArrayToPointerDecay>$
| | `-DeclRefExpr 0x6191080 <col:10> 'int [16]' lvalue Var
0x618c780 'b' 'int [16]'$
| `-ImplicitCastExpr 0x61912d8 <col:12> 'int' <LValueToRValue>$
| `-DeclRefExpr 0x6191150 <col:12> 'int' lvalue ParmVar
0x6190ec8 'n' 'int'$
In this case, getParents returns empty list even though ImplicitCastExpr
is clearly a parent and is a Stmt. My modification simply calls "const
auto Parents = getContext().getParents<Stmt>(ERef);" in
EmitArraySubscriptExpr. Has anyone run into a similar problem before?
Best,
Kevin
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