void updated this revision to Diff 499321.
void added a comment.
Report when there's a non-constant access:
array_access_report.c:32:17: remark: accessing fixed sized array 'int[16]' by
'index' [-Rarray-bounds]
report_size(p->array, index);
^
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D144136/new/
https://reviews.llvm.org/D144136
Files:
clang/include/clang/Basic/DiagnosticGroups.td
clang/include/clang/Basic/DiagnosticSemaKinds.td
clang/lib/Sema/SemaChecking.cpp
Index: clang/lib/Sema/SemaChecking.cpp
===================================================================
--- clang/lib/Sema/SemaChecking.cpp
+++ clang/lib/Sema/SemaChecking.cpp
@@ -16236,8 +16236,22 @@
return;
Expr::EvalResult Result;
- if (!IndexExpr->EvaluateAsInt(Result, Context, Expr::SE_AllowSideEffects))
+ if (!IndexExpr->EvaluateAsInt(Result, Context, Expr::SE_AllowSideEffects)) {
+ if (!IsUnboundedArray) {
+ SmallString<128> sizeString;
+ llvm::raw_svector_ostream OS(sizeString);
+
+ OS << "'";
+ IndexExpr->printPretty(OS, nullptr, getPrintingPolicy());
+ OS << "'";
+
+ Context.getDiagnostics().Report(
+ BaseExpr->getBeginLoc(), diag::remark_array_access)
+ << 0 << ArrayTy->desugar() << OS.str();
+ }
+
return;
+ }
llvm::APSInt index = Result.Val.getInt();
if (IndexNegated) {
@@ -16352,6 +16366,10 @@
else if (size.getBitWidth() < index.getBitWidth())
size = size.zext(index.getBitWidth());
+ Context.getDiagnostics().Report(
+ BaseExpr->getBeginLoc(), diag::remark_array_access)
+ << 0 << ArrayTy->desugar() << toString(index, 10, true);
+
// For array subscripting the index must be less than size, but for pointer
// arithmetic also allow the index (offset) to be equal to size since
// computing the next address after the end of the array is legal and
Index: clang/include/clang/Basic/DiagnosticSemaKinds.td
===================================================================
--- clang/include/clang/Basic/DiagnosticSemaKinds.td
+++ clang/include/clang/Basic/DiagnosticSemaKinds.td
@@ -9450,6 +9450,10 @@
def note_array_declared_here : Note<
"array %0 declared here">;
+def remark_array_access : Remark<
+ "accessing %select{fixed|dynamic}0 sized array %1 by %2">,
+ InGroup<ArrayBoundsRemarks>;
+
def warn_inconsistent_array_form : Warning<
"argument %0 of type %1 with mismatched bound">,
InGroup<ArrayParameter>, DefaultIgnore;
Index: clang/include/clang/Basic/DiagnosticGroups.td
===================================================================
--- clang/include/clang/Basic/DiagnosticGroups.td
+++ clang/include/clang/Basic/DiagnosticGroups.td
@@ -1304,6 +1304,9 @@
def ProfileInstrUnprofiled : DiagGroup<"profile-instr-unprofiled">;
def MisExpect : DiagGroup<"misexpect">;
+// Array bounds remarks.
+def ArrayBoundsRemarks : DiagGroup<"array-bounds">;
+
// AddressSanitizer frontend instrumentation remarks.
def SanitizeAddressRemarks : DiagGroup<"sanitize-address">;
Index: clang/lib/Sema/SemaChecking.cpp
===================================================================
--- clang/lib/Sema/SemaChecking.cpp
+++ clang/lib/Sema/SemaChecking.cpp
@@ -16236,8 +16236,22 @@
return;
Expr::EvalResult Result;
- if (!IndexExpr->EvaluateAsInt(Result, Context, Expr::SE_AllowSideEffects))
+ if (!IndexExpr->EvaluateAsInt(Result, Context, Expr::SE_AllowSideEffects)) {
+ if (!IsUnboundedArray) {
+ SmallString<128> sizeString;
+ llvm::raw_svector_ostream OS(sizeString);
+
+ OS << "'";
+ IndexExpr->printPretty(OS, nullptr, getPrintingPolicy());
+ OS << "'";
+
+ Context.getDiagnostics().Report(
+ BaseExpr->getBeginLoc(), diag::remark_array_access)
+ << 0 << ArrayTy->desugar() << OS.str();
+ }
+
return;
+ }
llvm::APSInt index = Result.Val.getInt();
if (IndexNegated) {
@@ -16352,6 +16366,10 @@
else if (size.getBitWidth() < index.getBitWidth())
size = size.zext(index.getBitWidth());
+ Context.getDiagnostics().Report(
+ BaseExpr->getBeginLoc(), diag::remark_array_access)
+ << 0 << ArrayTy->desugar() << toString(index, 10, true);
+
// For array subscripting the index must be less than size, but for pointer
// arithmetic also allow the index (offset) to be equal to size since
// computing the next address after the end of the array is legal and
Index: clang/include/clang/Basic/DiagnosticSemaKinds.td
===================================================================
--- clang/include/clang/Basic/DiagnosticSemaKinds.td
+++ clang/include/clang/Basic/DiagnosticSemaKinds.td
@@ -9450,6 +9450,10 @@
def note_array_declared_here : Note<
"array %0 declared here">;
+def remark_array_access : Remark<
+ "accessing %select{fixed|dynamic}0 sized array %1 by %2">,
+ InGroup<ArrayBoundsRemarks>;
+
def warn_inconsistent_array_form : Warning<
"argument %0 of type %1 with mismatched bound">,
InGroup<ArrayParameter>, DefaultIgnore;
Index: clang/include/clang/Basic/DiagnosticGroups.td
===================================================================
--- clang/include/clang/Basic/DiagnosticGroups.td
+++ clang/include/clang/Basic/DiagnosticGroups.td
@@ -1304,6 +1304,9 @@
def ProfileInstrUnprofiled : DiagGroup<"profile-instr-unprofiled">;
def MisExpect : DiagGroup<"misexpect">;
+// Array bounds remarks.
+def ArrayBoundsRemarks : DiagGroup<"array-bounds">;
+
// AddressSanitizer frontend instrumentation remarks.
def SanitizeAddressRemarks : DiagGroup<"sanitize-address">;
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