[clang-tools-extra] [clang-tidy] Add WarnOnSizeOfPointer mode to bugprone-sizeof-expression (PR #94356)
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Tue Jun 4 07:07:57 PDT 2024
llvmbot wrote:
<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-clang-tools-extra
Author: Donát Nagy (NagyDonat)
<details>
<summary>Changes</summary>
This commit reimplements the functionality of the Clang Static Analyzer checker `alpha.core.SizeofPointer` within clang-tidy by adding a new (off-by-default) option to bugprone-sizeof-expression which activates reporting all the `sizeof(ptr)` expressions (where ptr is an expression that produces a pointer).
The main motivation for this change is that `alpha.core.SizeofPointer` was an AST-based checker, which did not rely on the path sensitive capabilities of the Static Analyzer, so there was no reason to keep it in the Static Analyzer instead of the more lightweight clang-tidy.
After this commit I'm planning to create a separate commit that deletes `alpha.core.SizeofPointer` from Clang Static Analyzer.
It was natural to place this moved logic in bugprone-sizeof-expression, because that check already provided several heuristics that reported various especially suspicious classes of `sizeof(ptr)` expressions.
The new mode `WarnOnSizeOfPointer` is off-by-default, so it won't surprise the existing users; but it can provide a more through coverage for the vulnerability CWE-467 ("Use of sizeof() on a Pointer Type") than the existing partial heuristics.
I preserved the exception that the RHS of an expression that looks like `sizeof(array) / sizeof(array[0])` is not reported; and I added another exception which ensures that `sizeof(*pp)` is not reported when `pp` is a pointer-to-pointer expression.
This second exception (which I also apply in the "old" on-by-default mode `WarnOnSizeOfPointerToAggregate`) was present in the CSA checker `alpha.core.SizeofPoionter` and I decided to copy it because it helped to avoid several false positives on open-source code.
This commit also replaces the old message "suspicious usage of 'sizeof(A*)'; pointer to aggregate" with two more concrete messages; but I feel that this tidy check would deserve a through cleanup of all the diagnostic messages that it can produce. (I added a FIXME to mark one outright misleading message.)
---
Patch is 30.99 KiB, truncated to 20.00 KiB below, full version: https://github.com/llvm/llvm-project/pull/94356.diff
6 Files Affected:
- (modified) clang-tools-extra/clang-tidy/bugprone/SizeofExpressionCheck.cpp (+66-29)
- (modified) clang-tools-extra/clang-tidy/bugprone/SizeofExpressionCheck.h (+1)
- (modified) clang-tools-extra/docs/clang-tidy/checks/bugprone/sizeof-expression.rst (+5)
- (modified) clang-tools-extra/test/clang-tidy/checkers/bugprone/sizeof-expression-2.c (+6-6)
- (added) clang-tools-extra/test/clang-tidy/checkers/bugprone/sizeof-expression-any-pointer.cpp (+231)
- (modified) clang-tools-extra/test/clang-tidy/checkers/bugprone/sizeof-expression.cpp (+42-21)
``````````diff
diff --git a/clang-tools-extra/clang-tidy/bugprone/SizeofExpressionCheck.cpp b/clang-tools-extra/clang-tidy/bugprone/SizeofExpressionCheck.cpp
index 5e64d23874ec1..05ef666d4f01e 100644
--- a/clang-tools-extra/clang-tidy/bugprone/SizeofExpressionCheck.cpp
+++ b/clang-tools-extra/clang-tidy/bugprone/SizeofExpressionCheck.cpp
@@ -67,7 +67,8 @@ SizeofExpressionCheck::SizeofExpressionCheck(StringRef Name,
WarnOnSizeOfCompareToConstant(
Options.get("WarnOnSizeOfCompareToConstant", true)),
WarnOnSizeOfPointerToAggregate(
- Options.get("WarnOnSizeOfPointerToAggregate", true)) {}
+ Options.get("WarnOnSizeOfPointerToAggregate", true)),
+ WarnOnSizeOfPointer(Options.get("WarnOnSizeOfPointer", false)) {}
void SizeofExpressionCheck::storeOptions(ClangTidyOptions::OptionMap &Opts) {
Options.store(Opts, "WarnOnSizeOfConstant", WarnOnSizeOfConstant);
@@ -78,6 +79,7 @@ void SizeofExpressionCheck::storeOptions(ClangTidyOptions::OptionMap &Opts) {
WarnOnSizeOfCompareToConstant);
Options.store(Opts, "WarnOnSizeOfPointerToAggregate",
WarnOnSizeOfPointerToAggregate);
+ Options.store(Opts, "WarnOnSizeOfPointer", WarnOnSizeOfPointer);
}
void SizeofExpressionCheck::registerMatchers(MatchFinder *Finder) {
@@ -127,17 +129,30 @@ void SizeofExpressionCheck::registerMatchers(MatchFinder *Finder) {
const auto ConstStrLiteralDecl =
varDecl(isDefinition(), hasType(hasCanonicalType(CharPtrType)),
hasInitializer(ignoringParenImpCasts(stringLiteral())));
+ const auto VarWithConstStrLiteralDecl = expr(
+ hasType(hasCanonicalType(CharPtrType)),
+ ignoringParenImpCasts(declRefExpr(hasDeclaration(ConstStrLiteralDecl))));
Finder->addMatcher(
- sizeOfExpr(has(ignoringParenImpCasts(
- expr(hasType(hasCanonicalType(CharPtrType)),
- ignoringParenImpCasts(declRefExpr(
- hasDeclaration(ConstStrLiteralDecl)))))))
+ sizeOfExpr(has(ignoringParenImpCasts(VarWithConstStrLiteralDecl)))
.bind("sizeof-charp"),
this);
- // Detect sizeof(ptr) where ptr points to an aggregate (i.e. sizeof(&S)).
- // Do not find it if RHS of a 'sizeof(arr) / sizeof(arr[0])' expression.
- if (WarnOnSizeOfPointerToAggregate) {
+ // Detect sizeof(ptr) where ptr is a pointer (CWE-467).
+ //
+ // In WarnOnSizeOfPointerToAggregate mode only report cases when ptr points
+ // to an aggregate type or ptr is an expression that (implicitly or
+ // explicitly) casts an array to a pointer type. (These are more suspicious
+ // than other sizeof(ptr) expressions because they can appear as distorted
+ // forms of the common sizeof(aggregate) expressions.)
+ //
+ // To avoid false positives, some idiomatic constructs are accepted:
+ // + the RHS of a 'sizeof(arr) / sizeof(arr[0])' expression;
+ // + 'sizeof(*pp)' where 'pp' a pointer-to-pointer value, because this is
+ // a natural solution when dynamical typing is emulated by passing
+ // arguments as `generic_function(..., (void *)pp, sizeof(*pp))`.
+ // Moreover this generic message is suppressed in cases that are also matched
+ // by the more concrete matchers 'sizeof-this' and 'sizeof-charp'.
+ if (WarnOnSizeOfPointerToAggregate || WarnOnSizeOfPointer) {
const auto ArrayExpr =
ignoringParenImpCasts(hasType(hasCanonicalType(arrayType())));
const auto ArrayCastExpr = expr(anyOf(
@@ -149,8 +164,16 @@ void SizeofExpressionCheck::registerMatchers(MatchFinder *Finder) {
const auto PointerToStructType =
hasUnqualifiedDesugaredType(pointerType(pointee(recordType())));
- const auto PointerToStructExpr = expr(
- hasType(hasCanonicalType(PointerToStructType)), unless(cxxThisExpr()));
+ const auto PointerToStructTypeWithBinding =
+ type(PointerToStructType).bind("struct-type");
+ const auto PointerToStructExpr =
+ expr(hasType(hasCanonicalType(PointerToStructType)));
+
+ const auto PointerToDetectedExpr =
+ WarnOnSizeOfPointer
+ ? expr(hasType(hasUnqualifiedDesugaredType(pointerType())))
+ : expr(anyOf(ArrayCastExpr, PointerToArrayExpr,
+ PointerToStructExpr));
const auto ArrayOfPointersExpr = ignoringParenImpCasts(
hasType(hasCanonicalType(arrayType(hasElementType(pointerType()))
@@ -167,14 +190,17 @@ void SizeofExpressionCheck::registerMatchers(MatchFinder *Finder) {
hasLHS(ignoringParenImpCasts(sizeOfExpr(
has(ArrayOfPointersExpr)))))),
sizeOfExpr(has(ArrayOfSamePointersZeroSubscriptExpr)));
+ const auto DerefExpr =
+ ignoringParenImpCasts(unaryOperator(hasOperatorName("*")));
Finder->addMatcher(
- expr(sizeOfExpr(anyOf(
- has(ignoringParenImpCasts(anyOf(
- ArrayCastExpr, PointerToArrayExpr, PointerToStructExpr))),
- has(PointerToStructType))),
+ expr(sizeOfExpr(anyOf(has(ignoringParenImpCasts(
+ expr(PointerToDetectedExpr, unless(DerefExpr),
+ unless(VarWithConstStrLiteralDecl),
+ unless(cxxThisExpr())))),
+ has(PointerToStructTypeWithBinding))),
unless(ArrayLengthExprDenom))
- .bind("sizeof-pointer-to-aggregate"),
+ .bind("sizeof-pointer"),
this);
}
@@ -292,11 +318,17 @@ void SizeofExpressionCheck::check(const MatchFinder::MatchResult &Result) {
diag(E->getBeginLoc(),
"suspicious usage of 'sizeof(char*)'; do you mean 'strlen'?")
<< E->getSourceRange();
- } else if (const auto *E =
- Result.Nodes.getNodeAs<Expr>("sizeof-pointer-to-aggregate")) {
- diag(E->getBeginLoc(),
- "suspicious usage of 'sizeof(A*)'; pointer to aggregate")
- << E->getSourceRange();
+ } else if (const auto *E = Result.Nodes.getNodeAs<Expr>("sizeof-pointer")) {
+ if (Result.Nodes.getNodeAs<Type>("struct-type")) {
+ diag(E->getBeginLoc(),
+ "suspicious usage of 'sizeof(A*)' on pointer-to-aggregate type; did "
+ "you mean 'sizeof(A)'?")
+ << E->getSourceRange();
+ } else {
+ diag(E->getBeginLoc(), "suspicious usage of 'sizeof()' on an expression "
+ "that results in a pointer")
+ << E->getSourceRange();
+ }
} else if (const auto *E = Result.Nodes.getNodeAs<BinaryOperator>(
"sizeof-compare-constant")) {
diag(E->getOperatorLoc(),
@@ -332,18 +364,23 @@ void SizeofExpressionCheck::check(const MatchFinder::MatchResult &Result) {
" numerator is not a multiple of denominator")
<< E->getLHS()->getSourceRange() << E->getRHS()->getSourceRange();
} else if (NumTy && DenomTy && NumTy == DenomTy) {
+ // FIXME: This message is wrong, it should not refer to sizeof "pointer"
+ // usage (and by the way, it would be to clarify all the messages).
diag(E->getOperatorLoc(),
"suspicious usage of sizeof pointer 'sizeof(T)/sizeof(T)'")
<< E->getLHS()->getSourceRange() << E->getRHS()->getSourceRange();
- } else if (PointedTy && DenomTy && PointedTy == DenomTy) {
- diag(E->getOperatorLoc(),
- "suspicious usage of sizeof pointer 'sizeof(T*)/sizeof(T)'")
- << E->getLHS()->getSourceRange() << E->getRHS()->getSourceRange();
- } else if (NumTy && DenomTy && NumTy->isPointerType() &&
- DenomTy->isPointerType()) {
- diag(E->getOperatorLoc(),
- "suspicious usage of sizeof pointer 'sizeof(P*)/sizeof(Q*)'")
- << E->getLHS()->getSourceRange() << E->getRHS()->getSourceRange();
+ } else if (!WarnOnSizeOfPointer) {
+ // When 'WarnOnSizeOfPointer' is enabled, these messages become redundant:
+ if (PointedTy && DenomTy && PointedTy == DenomTy) {
+ diag(E->getOperatorLoc(),
+ "suspicious usage of sizeof pointer 'sizeof(T*)/sizeof(T)'")
+ << E->getLHS()->getSourceRange() << E->getRHS()->getSourceRange();
+ } else if (NumTy && DenomTy && NumTy->isPointerType() &&
+ DenomTy->isPointerType()) {
+ diag(E->getOperatorLoc(),
+ "suspicious usage of sizeof pointer 'sizeof(P*)/sizeof(Q*)'")
+ << E->getLHS()->getSourceRange() << E->getRHS()->getSourceRange();
+ }
}
} else if (const auto *E =
Result.Nodes.getNodeAs<Expr>("sizeof-sizeof-expr")) {
diff --git a/clang-tools-extra/clang-tidy/bugprone/SizeofExpressionCheck.h b/clang-tools-extra/clang-tidy/bugprone/SizeofExpressionCheck.h
index 55becdd4ecdba..9ca17bc9e6f12 100644
--- a/clang-tools-extra/clang-tidy/bugprone/SizeofExpressionCheck.h
+++ b/clang-tools-extra/clang-tidy/bugprone/SizeofExpressionCheck.h
@@ -30,6 +30,7 @@ class SizeofExpressionCheck : public ClangTidyCheck {
const bool WarnOnSizeOfThis;
const bool WarnOnSizeOfCompareToConstant;
const bool WarnOnSizeOfPointerToAggregate;
+ const bool WarnOnSizeOfPointer;
};
} // namespace clang::tidy::bugprone
diff --git a/clang-tools-extra/docs/clang-tidy/checks/bugprone/sizeof-expression.rst b/clang-tools-extra/docs/clang-tidy/checks/bugprone/sizeof-expression.rst
index c37df1706eb4e..8ddee3254c090 100644
--- a/clang-tools-extra/docs/clang-tidy/checks/bugprone/sizeof-expression.rst
+++ b/clang-tools-extra/docs/clang-tidy/checks/bugprone/sizeof-expression.rst
@@ -193,3 +193,8 @@ Options
When `true`, the check will warn on an expression like
``sizeof(expr)`` where the expression is a pointer
to aggregate. Default is `true`.
+
+.. option:: WarnOnSizeOfPointer
+
+ When `true`, the check will warn on an expression like ``sizeof(expr)``
+ where the expression is a pointer. Default is `false`.
diff --git a/clang-tools-extra/test/clang-tidy/checkers/bugprone/sizeof-expression-2.c b/clang-tools-extra/test/clang-tidy/checkers/bugprone/sizeof-expression-2.c
index 8c4feb8f86169..aef930f2c8fda 100644
--- a/clang-tools-extra/test/clang-tidy/checkers/bugprone/sizeof-expression-2.c
+++ b/clang-tools-extra/test/clang-tidy/checkers/bugprone/sizeof-expression-2.c
@@ -34,24 +34,24 @@ int Test5() {
int sum = 0;
sum += sizeof(&S);
- // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof(A*)'; pointer to aggregate
+ // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof()' on an expression that results in a pointer
sum += sizeof(__typeof(&S));
sum += sizeof(&TS);
- // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof(A*)'; pointer to aggregate
+ // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof()' on an expression that results in a pointer
sum += sizeof(__typeof(&TS));
sum += sizeof(STRKWD MyStruct*);
sum += sizeof(__typeof(STRKWD MyStruct*));
sum += sizeof(TypedefStruct*);
sum += sizeof(__typeof(TypedefStruct*));
sum += sizeof(PTTS);
- // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof(A*)'; pointer to aggregate
+ // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof()' on an expression that results in a pointer
sum += sizeof(PMyStruct);
sum += sizeof(PS);
- // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof(A*)'; pointer to aggregate
+ // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof()' on an expression that results in a pointer
sum += sizeof(PS2);
- // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof(A*)'; pointer to aggregate
+ // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof()' on an expression that results in a pointer
sum += sizeof(&A10);
- // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof(A*)'; pointer to aggregate
+ // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof()' on an expression that results in a pointer
#ifdef __cplusplus
MyStruct &rS = S;
diff --git a/clang-tools-extra/test/clang-tidy/checkers/bugprone/sizeof-expression-any-pointer.cpp b/clang-tools-extra/test/clang-tidy/checkers/bugprone/sizeof-expression-any-pointer.cpp
new file mode 100644
index 0000000000000..98ad2b385de7d
--- /dev/null
+++ b/clang-tools-extra/test/clang-tidy/checkers/bugprone/sizeof-expression-any-pointer.cpp
@@ -0,0 +1,231 @@
+// RUN: %check_clang_tidy %s bugprone-sizeof-expression %t -- -config="{CheckOptions: {bugprone-sizeof-expression.WarnOnSizeOfIntegerExpression: true, bugprone-sizeof-expression.WarnOnSizeOfPointer: true}}" --
+
+class C {
+ int size() { return sizeof(this); }
+ // CHECK-MESSAGES: :[[@LINE-1]]:23: warning: suspicious usage of 'sizeof(this)'
+};
+
+#define LEN 8
+
+int X;
+extern int A[10];
+extern short B[10];
+
+#pragma pack(1)
+struct S { char a, b, c; };
+
+enum E { E_VALUE = 0 };
+enum class EC { VALUE = 0 };
+
+bool AsBool() { return false; }
+int AsInt() { return 0; }
+E AsEnum() { return E_VALUE; }
+EC AsEnumClass() { return EC::VALUE; }
+S AsStruct() { return {}; }
+
+struct M {
+ int AsInt() { return 0; }
+ E AsEnum() { return E_VALUE; }
+ S AsStruct() { return {}; }
+};
+
+int Test1(const char* ptr) {
+ int sum = 0;
+ sum += sizeof(LEN);
+ // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof(K)'
+ sum += sizeof(LEN + 1);
+ // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof(K)'
+ sum += sizeof(sum, LEN);
+ // CHECK-MESSAGES: :[[@LINE-1]]:20: warning: suspicious usage of 'sizeof(..., ...)'
+ sum += sizeof(AsBool());
+ // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof()' on an expression that results in an integer
+ sum += sizeof(AsInt());
+ // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof()' on an expression that results in an integer
+ sum += sizeof(AsEnum());
+ // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof()' on an expression that results in an integer
+ sum += sizeof(AsEnumClass());
+ // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof()' on an expression that results in an integer
+ sum += sizeof(M{}.AsInt());
+ // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof()' on an expression that results in an integer
+ sum += sizeof(M{}.AsEnum());
+ // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof()' on an expression that results in an integer
+ sum += sizeof(sizeof(X));
+ // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof(sizeof(...))'
+ sum += sizeof(LEN + sizeof(X));
+ // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof(sizeof(...))'
+ sum += sizeof(LEN + LEN + sizeof(X));
+ // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof(sizeof(...))'
+ sum += sizeof(LEN + (LEN + sizeof(X)));
+ // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof(sizeof(...))'
+ sum += sizeof(LEN + -sizeof(X));
+ // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof(sizeof(...))'
+ sum += sizeof(LEN + - + -sizeof(X));
+ // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof(sizeof(...))'
+ sum += sizeof(char) / sizeof(char);
+ // CHECK-MESSAGES: :[[@LINE-1]]:23: warning: suspicious usage of sizeof pointer 'sizeof(T)/sizeof(T)'
+ sum += sizeof(A) / sizeof(S);
+ // CHECK-MESSAGES: :[[@LINE-1]]:20: warning: suspicious usage of 'sizeof(...)/sizeof(...)'; numerator is not a multiple of denominator
+ sum += sizeof(char) / sizeof(int);
+ // CHECK-MESSAGES: :[[@LINE-1]]:23: warning: suspicious usage of 'sizeof(...)/sizeof(...)'; numerator is not a multiple of denominator
+ sum += sizeof(char) / sizeof(A);
+ // CHECK-MESSAGES: :[[@LINE-1]]:23: warning: suspicious usage of 'sizeof(...)/sizeof(...)'; numerator is not a multiple of denominator
+ sum += sizeof(B[0]) / sizeof(A);
+ // CHECK-MESSAGES: :[[@LINE-1]]:23: warning: suspicious usage of 'sizeof(...)/sizeof(...)'; numerator is not a multiple of denominator
+ sum += sizeof(ptr) / sizeof(char);
+ // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof()' on an expression that results in a pointer
+ sum += sizeof(ptr) / sizeof(ptr[0]);
+ // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof()' on an expression that results in a pointer
+ sum += sizeof(ptr) / sizeof(char*);
+ // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof()' on an expression that results in a pointer
+ sum += sizeof(ptr) / sizeof(void*);
+ // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof()' on an expression that results in a pointer
+ sum += sizeof(ptr) / sizeof(const void volatile*);
+ // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof()' on an expression that results in a pointer
+ sum += sizeof(ptr) / sizeof(char);
+ // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof()' on an expression that results in a pointer
+ sum += sizeof(int) * sizeof(char);
+ // CHECK-MESSAGES: :[[@LINE-1]]:22: warning: suspicious 'sizeof' by 'sizeof' multiplication
+ sum += sizeof(ptr) * sizeof(ptr[0]);
+ // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof()' on an expression that results in a pointer
+ // CHECK-MESSAGES: :[[@LINE-2]]:22: warning: suspicious 'sizeof' by 'sizeof' multiplication
+ sum += sizeof(int) * (2 * sizeof(char));
+ // CHECK-MESSAGES: :[[@LINE-1]]:22: warning: suspicious 'sizeof' by 'sizeof' multiplication
+ sum += (2 * sizeof(char)) * sizeof(int);
+ // CHECK-MESSAGES: :[[@LINE-1]]:29: warning: suspicious 'sizeof' by 'sizeof' multiplication
+ if (sizeof(A) < 0x100000) sum += 42;
+ // CHECK-MESSAGES: :[[@LINE-1]]:17: warning: suspicious comparison of 'sizeof(expr)' to a constant
+ if (sizeof(A) <= 0xFFFFFFFEU) sum += 42;
+ // CHECK-MESSAGES: :[[@LINE-1]]:17: warning: suspicious comparison of 'sizeof(expr)' to a constant
+ return sum;
+}
+
+int Test5() {
+ typedef int Array10[10];
+ typedef C ArrayC[10];
+
+ struct MyStruct {
+ Array10 arr;
+ Array10* ptr;
+ };
+ typedef const MyStruct TMyStruct;
+ typedef const MyStruct *PMyStruct;
+ typedef TMyStruct *PMyStruct2;
+
+ static TMyStruct kGlocalMyStruct = {};
+ static TMyStruct volatile * kGlocalMyStructPtr = &kGlocalMyStruct;
+
+ MyStruct S;
+ PMyStruct PS;
+ PMyStruct2 PS2;
+ Array10 A10;
+ C *PtrArray[10];
+ C *PC;
+
+ char *PChar;
+ int *PInt, **PPInt;
+ MyStruct **PPMyStruct;
+
+ int sum = 0;
+ sum += sizeof(&S.arr);
+ // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof()' on an expression that results in a pointer
+ sum += sizeof(&kGlocalMyStruct.arr);
+ // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof()' on an expression that results in a pointer
+ sum += sizeof(&kGlocalMyStructPtr->arr);
+ // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof()' on an expression that results in a pointer
+ sum += sizeof(S.arr + 0);
+ // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof()' on an expression that results in a pointer
+ sum += sizeof(+ S.arr);
+ // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof()' on an expression that results in a pointer
+ sum += sizeof((int*)S.arr);
+ // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof()' on an expression that results in a pointer
+
+ sum += sizeof(S.ptr);
+ // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof()' on an expression that results in a pointer
+ sum += sizeof(kGlocalMyStruct.ptr);
+ // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof()' on an expression that results in a pointer
+ sum += sizeof(kGlocalMyStructPtr->ptr);
+ // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof()' on an expression that results in a pointer
+
+ sum += sizeof(&kGlocalMyStruct);
+ // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof()' on an expression that results in a pointer
+ sum += sizeof(&S);
+ // CHECK-MESSAGES: :[[@LINE-1]]:10: warning: suspicious usage of 'sizeof()' on an expression that results in a pointer
+ sum += sizeof(MyStruct*);
+ sum...
[truncated]
``````````
</details>
https://github.com/llvm/llvm-project/pull/94356
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