chrish_ericsson_atx updated this revision to Diff 289815.
chrish_ericsson_atx added a comment.
NC. Pushing null change in hopes of re-triggering testing.
Unit test that failed is low-level LLVM test, which doesn't even exercise the
code I've changed here, so I'm assuming it's a spurious failure in the CI
machinery.
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D86796/new/
https://reviews.llvm.org/D86796
Files:
clang/include/clang/Basic/DiagnosticSemaKinds.td
clang/lib/Sema/SemaChecking.cpp
clang/test/Sema/const-eval.c
clang/test/Sema/unbounded-array-bounds.c
clang/test/SemaCXX/constant-expression-cxx1y.cpp
Index: clang/test/SemaCXX/constant-expression-cxx1y.cpp
===================================================================
--- clang/test/SemaCXX/constant-expression-cxx1y.cpp
+++ clang/test/SemaCXX/constant-expression-cxx1y.cpp
@@ -1018,8 +1018,9 @@
}
constexpr void PR28739(int n) { // expected-error {{never produces a constant}}
- int *p = &n;
+ int *p = &n; // expected-note {{declared here}}
p += (__int128)(unsigned long)-1; // expected-note {{cannot refer to element 18446744073709551615 of non-array object in a constant expression}}
+ // expected-warning@-1 {{refers past the last possible element}}
}
constexpr void Void(int n) {
Index: clang/test/Sema/unbounded-array-bounds.c
===================================================================
--- /dev/null
+++ clang/test/Sema/unbounded-array-bounds.c
@@ -0,0 +1,70 @@
+// RUN: %clang_cc1 -triple x86_64-pc-linux-gnu -fsyntax-only %s 2>&1 | FileCheck --check-prefix=CHECK-X86-ADDR64 %s \
+// RUN: --implicit-check-not 'past the last possible element'
+// RUN: %clang_cc1 -triple i386-pc-linux-gnu -fsyntax-only %s 2>&1 | FileCheck --check-prefix=CHECK-I386-ADDR32 %s \
+// RUN: --implicit-check-not 'past the last possible element'
+// RUN: %clang_cc1 -triple avr-pc-linux-gnu -fsyntax-only %s 2>&1 | FileCheck --check-prefix=CHECK-AVR-ADDR16 %s \
+// RUN: --implicit-check-not 'past the last possible element'
+
+struct S {
+ long long a;
+ char b;
+ long long c;
+ short d;
+};
+
+struct S s[];
+
+void f1() {
+ ++s[3].a;
+ ++s[7073650413200313099].b;
+ // CHECK-X86-ADDR64: :[[@LINE-1]]:5: warning: {{.*}} past the last possible element {{.*}} in 64-bit {{.*}} (max possible 576460752303423488 elements)
+ // CHECK-I386-ADDR32: :[[@LINE-2]]:5: warning: {{.*}} past the last possible element {{.*}} in 32-bit {{.*}} (max possible 178956970 elements)
+ // CHECK-AVR-ADDR16: :[[@LINE-3]]:5: warning: {{.*}} past the last possible element {{.*}} in 16-bit {{.*}} (max possible 3276 elements)
+ ++s[7073650].c;
+ // CHECK-AVR-ADDR16: :[[@LINE-1]]:5: warning: {{.*}} past the last possible element {{.*}} in 16-bit {{.*}} (max possible 3276 elements)
+}
+
+long long ll[];
+
+void f2() {
+ ++ll[3];
+ ++ll[2705843009213693952];
+ // CHECK-X86-ADDR64: :[[@LINE-1]]:5: warning: {{.*}} past the last possible element {{.*}} in 64-bit {{.*}} (max possible 2305843009213693952 elements)
+ // CHECK-I386-ADDR32: :[[@LINE-2]]:5: warning: {{.*}} past the last possible element {{.*}} in 32-bit {{.*}} (max possible 536870912 elements)
+ // CHECK-AVR-ADDR16: :[[@LINE-3]]:5: warning: {{.*}} past the last possible element {{.*}} in 16-bit {{.*}} (max possible 8192 elements)
+ ++ll[847073650];
+ // CHECK-I386-ADDR32: :[[@LINE-1]]:5: warning: {{.*}} past the last possible element {{.*}} in 32-bit {{.*}} (max possible 536870912 elements)
+ // CHECK-AVR-ADDR16: :[[@LINE-2]]:5: warning: {{.*}} past the last possible element {{.*}} in 16-bit {{.*}} (max possible 8192 elements)
+}
+
+void f3(struct S p[]) {
+ ++p[3].a;
+ ++p[7073650413200313099].b;
+ // CHECK-X86-ADDR64: :[[@LINE-1]]:5: warning: {{.*}} past the last possible element {{.*}} in 64-bit {{.*}} (max possible 576460752303423488 elements)
+ // CHECK-I386-ADDR32: :[[@LINE-2]]:5: warning: {{.*}} past the last possible element {{.*}} in 32-bit {{.*}} (max possible 178956970 elements)
+ // CHECK-AVR-ADDR16: :[[@LINE-3]]:5: warning: {{.*}} past the last possible element {{.*}} in 16-bit {{.*}} (max possible 3276 elements)
+ ++p[7073650].c;
+ // CHECK-AVR-ADDR16: :[[@LINE-1]]:5: warning: {{.*}} past the last possible element {{.*}} in 16-bit {{.*}} (max possible 3276 elements)
+}
+
+void f4(struct S *p) {
+ p += 3;
+ p += 7073650413200313099;
+ // CHECK-X86-ADDR64: :[[@LINE-1]]:3: warning: {{.*}} past the last possible element {{.*}} in 64-bit {{.*}} (max possible 576460752303423488 elements)
+ // CHECK-I386-ADDR32: :[[@LINE-2]]:3: warning: {{.*}} past the last possible element {{.*}} in 32-bit {{.*}} (max possible 178956970 elements)
+ // CHECK-AVR-ADDR16: :[[@LINE-3]]:3: warning: {{.*}} past the last possible element {{.*}} in 16-bit {{.*}} (max possible 3276 elements)
+ p += 7073650;
+ // CHECK-AVR-ADDR16: :[[@LINE-1]]:3: warning: {{.*}} past the last possible element {{.*}} in 16-bit {{.*}} (max possible 3276 elements)
+}
+
+struct BQ {
+ struct S bigblock[3276];
+};
+
+struct BQ bq[];
+
+void f5() {
+ ++bq[0].bigblock[0].a;
+ ++bq[1].bigblock[0].a;
+ // CHECK-AVR-ADDR16: :[[@LINE-1]]:5: warning: {{.*}} past the last possible element {{.*}} in 16-bit {{.*}} (max possible 1 element)
+}
Index: clang/test/Sema/const-eval.c
===================================================================
--- clang/test/Sema/const-eval.c
+++ clang/test/Sema/const-eval.c
@@ -140,10 +140,10 @@
// We evaluate these by providing 2s' complement semantics in constant
// expressions, like we do for integers.
-void *PR28739a = (__int128)(unsigned long)-1 + &PR28739a;
-void *PR28739b = &PR28739b + (__int128)(unsigned long)-1;
-__int128 PR28739c = (&PR28739c + (__int128)(unsigned long)-1) - &PR28739c;
-void *PR28739d = &(&PR28739d)[(__int128)(unsigned long)-1];
+void *PR28739a = (__int128)(unsigned long)-1 + &PR28739a; // expected-warning {{refers past the last possible element}}
+void *PR28739b = &PR28739b + (__int128)(unsigned long)-1; // expected-warning {{refers past the last possible element}}
+__int128 PR28739c = (&PR28739c + (__int128)(unsigned long)-1) - &PR28739c; // expected-warning {{refers past the last possible element}}
+void *PR28739d = &(&PR28739d)[(__int128)(unsigned long)-1]; // expected-warning {{refers past the last possible element}}
struct PR35214_X {
int k;
Index: clang/lib/Sema/SemaChecking.cpp
===================================================================
--- clang/lib/Sema/SemaChecking.cpp
+++ clang/lib/Sema/SemaChecking.cpp
@@ -14038,11 +14038,11 @@
const ConstantArrayType *ArrayTy =
Context.getAsConstantArrayType(BaseExpr->getType());
- if (!ArrayTy)
- return;
-
- const Type *BaseType = ArrayTy->getElementType().getTypePtr();
- if (EffectiveType->isDependentType() || BaseType->isDependentType())
+ const Type *BaseType =
+ ArrayTy == nullptr ? nullptr : ArrayTy->getElementType().getTypePtr();
+ bool isUnboundedArray = (BaseType == nullptr);
+ if (EffectiveType->isDependentType() ||
+ (!isUnboundedArray && BaseType->isDependentType()))
return;
Expr::EvalResult Result;
@@ -14059,6 +14059,71 @@
if (const MemberExpr *ME = dyn_cast<MemberExpr>(BaseExpr))
ND = ME->getMemberDecl();
+ if (isUnboundedArray) {
+ if (index.isUnsigned() || !index.isNegative()) {
+ const auto &ASTC = getASTContext();
+ unsigned AddrBits =
+ ASTC.getTargetInfo().getPointerWidth(ASTC.getTargetAddressSpace(
+ EffectiveType->getCanonicalTypeInternal()));
+ if (index.getBitWidth() < AddrBits)
+ index = index.zext(AddrBits);
+ CharUnits ElemBytes = ASTC.getTypeSizeInChars(EffectiveType);
+ llvm::APInt apElemBytes(index.getBitWidth(), ElemBytes.getQuantity());
+ // If index has more active bits than address space, we already know
+ // we have a bounds violation to warn about. Otherwise, compute
+ // address of (index + 1)th element, and warn about bounds violation
+ // only if that address exceeds address space.
+ if (index.getActiveBits() <= AddrBits) {
+ bool overflow;
+ llvm::APInt product(index);
+ product += 1;
+ product = product.umul_ov(apElemBytes, overflow);
+ if (!overflow && product.getActiveBits() <= AddrBits)
+ return;
+ }
+
+ // Need to compute max possible elements in address space, since that
+ // is included in diag message.
+ llvm::APInt MaxElems = llvm::APInt::getMaxValue(AddrBits);
+ MaxElems =
+ MaxElems.zext(std::max(AddrBits + 1, apElemBytes.getBitWidth()));
+ MaxElems += 1;
+ apElemBytes = apElemBytes.zextOrTrunc(MaxElems.getBitWidth());
+ MaxElems = MaxElems.udiv(apElemBytes);
+
+ unsigned DiagID = diag::warn_ptr_arith_exceeds_max_addressable_bounds;
+ if (ASE)
+ DiagID = diag::warn_array_index_exceeds_max_addressable_bounds;
+
+ // Diag message shows element size in bits and in "bytes" (platform-
+ // dependent CharUnits)
+ DiagRuntimeBehavior(BaseExpr->getBeginLoc(), BaseExpr,
+ PDiag(DiagID)
+ << index.toString(10, true) << AddrBits
+ << (unsigned)ASTC.toBits(ElemBytes)
+ << apElemBytes.toString(10, false)
+ << MaxElems.toString(10, false)
+ << (unsigned)MaxElems.getLimitedValue(~0U)
+ << IndexExpr->getSourceRange());
+
+ if (!ND) {
+ // Try harder to find a NamedDecl to point at in the note.
+ while (const ArraySubscriptExpr *ASE =
+ dyn_cast<ArraySubscriptExpr>(BaseExpr))
+ BaseExpr = ASE->getBase()->IgnoreParenCasts();
+ if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(BaseExpr))
+ ND = DRE->getDecl();
+ if (const MemberExpr *ME = dyn_cast<MemberExpr>(BaseExpr))
+ ND = ME->getMemberDecl();
+ }
+
+ if (ND)
+ DiagRuntimeBehavior(ND->getBeginLoc(), BaseExpr,
+ PDiag(diag::note_array_declared_here) << ND);
+ }
+ return;
+ }
+
if (index.isUnsigned() || !index.isNegative()) {
// It is possible that the type of the base expression after
// IgnoreParenCasts is incomplete, even though the type of the base
Index: clang/include/clang/Basic/DiagnosticSemaKinds.td
===================================================================
--- clang/include/clang/Basic/DiagnosticSemaKinds.td
+++ clang/include/clang/Basic/DiagnosticSemaKinds.td
@@ -8834,6 +8834,14 @@
def warn_array_index_exceeds_bounds : Warning<
"array index %0 is past the end of the array (which contains %1 "
"element%s2)">, InGroup<ArrayBounds>;
+def warn_ptr_arith_exceeds_max_addressable_bounds : Warning<
+ "the pointer incremented by %0 refers past the last possible element for an array in %1-bit "
+ "address space containing %2-bit (%3-byte) elements (max possible %4 element%s5)">,
+ InGroup<ArrayBounds>;
+def warn_array_index_exceeds_max_addressable_bounds : Warning<
+ "array index %0 refers past the last possible element for an array in %1-bit "
+ "address space containing %2-bit (%3-byte) elements (max possible %4 element%s5)">,
+ InGroup<ArrayBounds>;
def note_array_declared_here : Note<
"array %0 declared here">;
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