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[clang][Interp] Don't diagnose indexing arrays with index 0 #102454

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Merged
merged 1 commit into from
Aug 8, 2024
Merged

[clang][Interp] Don't diagnose indexing arrays with index 0 #102454

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4 changes: 2 additions & 2 deletions clang/lib/AST/Interp/Interp.h
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Original file line number Diff line number Diff line change
Expand Up @@ -2421,7 +2421,7 @@ inline bool ArrayElemPtr(InterpState &S, CodePtr OpPC) {
const T &Offset = S.Stk.pop<T>();
const Pointer &Ptr = S.Stk.peek<Pointer>();

if (!Ptr.isZero()) {
if (!Ptr.isZero() && !Offset.isZero()) {
if (!CheckArray(S, OpPC, Ptr))
return false;
}
Expand All @@ -2437,7 +2437,7 @@ inline bool ArrayElemPtrPop(InterpState &S, CodePtr OpPC) {
const T &Offset = S.Stk.pop<T>();
const Pointer &Ptr = S.Stk.pop<Pointer>();

if (!Ptr.isZero()) {
if (!Ptr.isZero() && !Offset.isZero()) {
if (!CheckArray(S, OpPC, Ptr))
return false;
}
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12 changes: 7 additions & 5 deletions clang/test/AST/Interp/literals.cpp
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Expand Up @@ -1196,13 +1196,15 @@ namespace incdecbool {
}

#if __cplusplus >= 201402L
/// NOTE: The diagnostics of the two interpreters are a little
/// different here, but they both make sense.
constexpr int externvar1() { // both-error {{never produces a constant expression}}
extern char arr[]; // ref-note {{declared here}}
return arr[0]; // ref-note {{read of non-constexpr variable 'arr'}} \
// expected-note {{indexing of array without known bound}}
extern char arr[]; // both-note {{declared here}}
return arr[0]; // both-note {{read of non-constexpr variable 'arr'}}
}
namespace externarr {
extern int arr[];
constexpr int *externarrindex = &arr[0]; /// No diagnostic.
}


namespace StmtExprs {
constexpr int foo() {
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