[clang] [clang] Catch missing format attributes (PR #105479)
Budimir Aranđelović via cfe-commits
cfe-commits at lists.llvm.org
Fri Oct 11 08:02:00 PDT 2024
https://github.com/budimirarandjelovichtec updated https://github.com/llvm/llvm-project/pull/105479
>From ee6336fdca188ddf980fcd83d037c05cd7fd84f9 Mon Sep 17 00:00:00 2001
From: budimirarandjelovicsyrmia <budimir.arandjelovic at syrmia.com>
Date: Fri, 5 Apr 2024 15:20:37 +0200
Subject: [PATCH] [clang] Catch missing format attributes
---
clang/docs/ReleaseNotes.rst | 2 +
clang/include/clang/Basic/DiagnosticGroups.td | 1 -
.../clang/Basic/DiagnosticSemaKinds.td | 3 +
clang/include/clang/Sema/Attr.h | 7 +
clang/include/clang/Sema/Sema.h | 2 +
clang/lib/Sema/SemaDecl.cpp | 2 +
clang/lib/Sema/SemaDeclAttr.cpp | 220 +++++++++++++++++-
clang/test/Sema/attr-format-missing.c | 217 +++++++++++++++++
clang/test/Sema/attr-format-missing.cpp | 180 ++++++++++++++
9 files changed, 631 insertions(+), 3 deletions(-)
create mode 100644 clang/test/Sema/attr-format-missing.c
create mode 100644 clang/test/Sema/attr-format-missing.cpp
diff --git a/clang/docs/ReleaseNotes.rst b/clang/docs/ReleaseNotes.rst
index 763bc3ac159322..718fae30426b64 100644
--- a/clang/docs/ReleaseNotes.rst
+++ b/clang/docs/ReleaseNotes.rst
@@ -401,6 +401,8 @@ Improvements to Clang's diagnostics
name was a reserved name, which we improperly allowed to suppress the
diagnostic.
+- Clang now diagnoses missing format attributes for non-template functions and class/struct/union members. (#GH60718)
+
Improvements to Clang's time-trace
----------------------------------
diff --git a/clang/include/clang/Basic/DiagnosticGroups.td b/clang/include/clang/Basic/DiagnosticGroups.td
index 8273701e7b0963..417f2dbdc6a68a 100644
--- a/clang/include/clang/Basic/DiagnosticGroups.td
+++ b/clang/include/clang/Basic/DiagnosticGroups.td
@@ -529,7 +529,6 @@ def MainReturnType : DiagGroup<"main-return-type">;
def MaxUnsignedZero : DiagGroup<"max-unsigned-zero">;
def MissingBraces : DiagGroup<"missing-braces">;
def MissingDeclarations: DiagGroup<"missing-declarations">;
-def : DiagGroup<"missing-format-attribute">;
def MissingIncludeDirs : DiagGroup<"missing-include-dirs">;
def MissingNoreturn : DiagGroup<"missing-noreturn">;
def MultiChar : DiagGroup<"multichar">;
diff --git a/clang/include/clang/Basic/DiagnosticSemaKinds.td b/clang/include/clang/Basic/DiagnosticSemaKinds.td
index 41cdd09e971651..d36d44055dcb6a 100644
--- a/clang/include/clang/Basic/DiagnosticSemaKinds.td
+++ b/clang/include/clang/Basic/DiagnosticSemaKinds.td
@@ -1046,6 +1046,9 @@ def err_opencl_invalid_param : Error<
"declaring function parameter of type %0 is not allowed%select{; did you forget * ?|}1">;
def err_opencl_invalid_return : Error<
"declaring function return value of type %0 is not allowed %select{; did you forget * ?|}1">;
+def warn_missing_format_attribute : Warning<
+ "diagnostic behavior may be improved by adding the %0 format attribute to the declaration of %1">,
+ InGroup<DiagGroup<"missing-format-attribute">>, DefaultIgnore;
def warn_pragma_options_align_reset_failed : Warning<
"#pragma options align=reset failed: %0">,
InGroup<IgnoredPragmas>;
diff --git a/clang/include/clang/Sema/Attr.h b/clang/include/clang/Sema/Attr.h
index 3f0b10212789a4..37c124ca7b454a 100644
--- a/clang/include/clang/Sema/Attr.h
+++ b/clang/include/clang/Sema/Attr.h
@@ -123,6 +123,13 @@ inline bool isInstanceMethod(const Decl *D) {
return false;
}
+inline bool checkIfMethodHasImplicitObjectParameter(const Decl *D) {
+ if (const auto *MethodDecl = dyn_cast<CXXMethodDecl>(D))
+ return MethodDecl->isInstance() &&
+ !MethodDecl->hasCXXExplicitFunctionObjectParameter();
+ return false;
+}
+
/// Diagnose mutually exclusive attributes when present on a given
/// declaration. Returns true if diagnosed.
template <typename AttrTy>
diff --git a/clang/include/clang/Sema/Sema.h b/clang/include/clang/Sema/Sema.h
index 24191fd688dc5a..f09c8ae8dddc2b 100644
--- a/clang/include/clang/Sema/Sema.h
+++ b/clang/include/clang/Sema/Sema.h
@@ -4576,6 +4576,8 @@ class Sema final : public SemaBase {
enum class RetainOwnershipKind { NS, CF, OS };
+ void DiagnoseMissingFormatAttributes(Stmt *Body, const FunctionDecl *FDecl);
+
UuidAttr *mergeUuidAttr(Decl *D, const AttributeCommonInfo &CI,
StringRef UuidAsWritten, MSGuidDecl *GuidDecl);
diff --git a/clang/lib/Sema/SemaDecl.cpp b/clang/lib/Sema/SemaDecl.cpp
index 118873bc93ad4b..eecfbe76fe497b 100644
--- a/clang/lib/Sema/SemaDecl.cpp
+++ b/clang/lib/Sema/SemaDecl.cpp
@@ -16034,6 +16034,8 @@ Decl *Sema::ActOnFinishFunctionBody(Decl *dcl, Stmt *Body,
}
}
+ DiagnoseMissingFormatAttributes(Body, FD);
+
// We might not have found a prototype because we didn't wish to warn on
// the lack of a missing prototype. Try again without the checks for
// whether we want to warn on the missing prototype.
diff --git a/clang/lib/Sema/SemaDeclAttr.cpp b/clang/lib/Sema/SemaDeclAttr.cpp
index 6759aae37afac1..cfd0be6534d02c 100644
--- a/clang/lib/Sema/SemaDeclAttr.cpp
+++ b/clang/lib/Sema/SemaDeclAttr.cpp
@@ -3624,7 +3624,7 @@ static void handleFormatAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
// In C++ the implicit 'this' function parameter also counts, and they are
// counted from one.
- bool HasImplicitThisParam = isInstanceMethod(D);
+ bool HasImplicitThisParam = checkIfMethodHasImplicitObjectParameter(D);
unsigned NumArgs = getFunctionOrMethodNumParams(D) + HasImplicitThisParam;
IdentifierInfo *II = AL.getArgAsIdent(0)->Ident;
@@ -3737,7 +3737,7 @@ static void handleCallbackAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
return;
}
- bool HasImplicitThisParam = isInstanceMethod(D);
+ bool HasImplicitThisParam = checkIfMethodHasImplicitObjectParameter(D);
int32_t NumArgs = getFunctionOrMethodNumParams(D);
FunctionDecl *FD = D->getAsFunction();
@@ -5421,6 +5421,222 @@ static void handlePreferredTypeAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
D->addAttr(::new (S.Context) PreferredTypeAttr(S.Context, AL, ParmTSI));
}
+// Returns vector of format attributes. There are no two attributes with same
+// arguments in returning vector. There can be attributes that effectively only
+// store information about format type.
+static std::vector<FormatAttr *>
+GetMissingFormatAttributes(Sema &S, Stmt *Body, const FunctionDecl *FDecl) {
+ unsigned int ArgumentIndexOffset =
+ checkIfMethodHasImplicitObjectParameter(FDecl) ? 2 : 1;
+
+ std::vector<FormatAttr *> MissingAttributes;
+
+ // Iterate over body statements.
+ for (auto *Child : Body->children()) {
+ // If child statement is compound statement, recursively get missing
+ // attributes.
+ if (dyn_cast_or_null<CompoundStmt>(Child)) {
+ std::vector<FormatAttr *> CompoundStmtMissingAttributes =
+ GetMissingFormatAttributes(S, Child, FDecl);
+
+ // If there are already missing attributes with same arguments, do not add
+ // duplicates.
+ for (FormatAttr *FA : CompoundStmtMissingAttributes) {
+ if (!llvm::any_of(MissingAttributes, [&](const FormatAttr *Attr) {
+ return FA->getType() == Attr->getType() &&
+ FA->getFormatIdx() == Attr->getFormatIdx() &&
+ FA->getFirstArg() == Attr->getFirstArg();
+ }))
+ MissingAttributes.push_back(FA);
+ }
+
+ continue;
+ }
+
+ ValueStmt *VS = dyn_cast<ValueStmt>(Child);
+ if (!VS)
+ continue;
+ CallExpr *TheCall = dyn_cast_or_null<CallExpr>(VS->getExprStmt());
+ if (!TheCall)
+ continue;
+
+ const FunctionDecl *CalleeFunction =
+ dyn_cast_or_null<FunctionDecl>(TheCall->getCalleeDecl());
+ if (!CalleeFunction || !CalleeFunction->hasAttr<FormatAttr>())
+ continue;
+
+ // va_list is not intended to be passed to variadic function.
+ if (CalleeFunction->isVariadic())
+ continue;
+
+ Expr **Args = TheCall->getArgs();
+ unsigned int NumArgs = TheCall->getNumArgs();
+
+ // Check if va_list is passed to callee function.
+ // If va_list is not passed, continue to the next iteration.
+ bool hasVaList = false;
+ for (const auto *Param : CalleeFunction->parameters()) {
+ if (Param->getOriginalType().getCanonicalType() ==
+ S.getASTContext().getBuiltinVaListType().getCanonicalType()) {
+ hasVaList = true;
+ break;
+ }
+ }
+ if (!hasVaList)
+ continue;
+
+ // If callee expression is function, check if it is format function.
+ // If it is, check if caller function misses format attributes.
+
+ unsigned int CalleeFunctionFormatArgumentIndexOffset =
+ checkIfMethodHasImplicitObjectParameter(CalleeFunction) ? 2 : 1;
+
+ // If callee function is format function and format arguments are not
+ // relevant to emit diagnostic, save only information about format type
+ // (format index and first-to-check argument index are set to -1).
+ // Information about format type is later used to determine if there are
+ // more than one format type found.
+
+ // Check if function has format attribute with forwarded format string.
+ IdentifierInfo *AttrType;
+ const ParmVarDecl *FormatArg;
+ if (!llvm::any_of(CalleeFunction->specific_attrs<FormatAttr>(),
+ [&](const FormatAttr *Attr) {
+ AttrType = Attr->getType();
+
+ int OffsetFormatIndex =
+ Attr->getFormatIdx() -
+ CalleeFunctionFormatArgumentIndexOffset;
+ if (OffsetFormatIndex < 0 ||
+ (unsigned)OffsetFormatIndex >= NumArgs)
+ return false;
+
+ if (const auto *FormatArgExpr = dyn_cast<DeclRefExpr>(
+ Args[OffsetFormatIndex]->IgnoreParenCasts()))
+ if (FormatArg = dyn_cast_or_null<ParmVarDecl>(
+ FormatArgExpr->getReferencedDeclOfCallee()))
+ return true;
+ return false;
+ })) {
+ MissingAttributes.push_back(
+ FormatAttr::CreateImplicit(S.getASTContext(), AttrType, -1, -1));
+ continue;
+ }
+
+ // If format string argument is caller function parameter, get string index.
+ // Otherwise, save only attribute type and go to next iteration.
+ int StringIndex = [=]() -> int {
+ for (const ParmVarDecl *Param : FDecl->parameters()) {
+ if (Param == FormatArg)
+ return Param->getFunctionScopeIndex() + ArgumentIndexOffset;
+ }
+ return 0;
+ }();
+
+ if (StringIndex == 0) {
+ MissingAttributes.push_back(
+ FormatAttr::CreateImplicit(S.getASTContext(), AttrType, -1, -1));
+ continue;
+ }
+
+ unsigned NumOfCallerFunctionParams = FDecl->getNumParams();
+
+ // Compare caller and callee function format attribute arguments (archetype
+ // and format string).
+ if (llvm::any_of(
+ FDecl->specific_attrs<FormatAttr>(), [&](const FormatAttr *Attr) {
+ if (Attr->getType() != AttrType)
+ return false;
+ int OffsetFormatIndex =
+ Attr->getFormatIdx() - ArgumentIndexOffset;
+
+ if (OffsetFormatIndex < 0 ||
+ (unsigned)OffsetFormatIndex >= NumOfCallerFunctionParams)
+ return false;
+
+ if (FDecl->parameters()[OffsetFormatIndex] != FormatArg)
+ return false;
+
+ return true;
+ })) {
+ MissingAttributes.push_back(
+ FormatAttr::CreateImplicit(S.getASTContext(), AttrType, -1, -1));
+ continue;
+ }
+
+ // Get first argument index
+ int FirstToCheck = FDecl->isVariadic()
+ ? (NumOfCallerFunctionParams + ArgumentIndexOffset)
+ : 0;
+
+ // If there are already attributes which arguments matches arguments
+ // detected in this iteration, do not add new attribute as it would be
+ // duplicate.
+ if (!llvm::any_of(MissingAttributes, [&](const FormatAttr *Attr) {
+ return Attr->getType() == AttrType &&
+ Attr->getFormatIdx() == StringIndex &&
+ Attr->getFirstArg() == FirstToCheck;
+ }))
+ MissingAttributes.push_back(FormatAttr::CreateImplicit(
+ S.getASTContext(), AttrType, StringIndex, FirstToCheck));
+ }
+
+ return MissingAttributes;
+}
+
+// This function is called only if function call is not inside template body.
+// TODO: Add call for function calls inside template body.
+// Emit warnings if caller function misses format attributes.
+void Sema::DiagnoseMissingFormatAttributes(Stmt *Body,
+ const FunctionDecl *FDecl) {
+ assert(FDecl);
+
+ // If there are no function body, exit.
+ if (!Body)
+ return;
+
+ // Get missing format attributes
+ std::vector<FormatAttr *> MissingFormatAttributes =
+ GetMissingFormatAttributes(*this, Body, FDecl);
+ if (MissingFormatAttributes.empty())
+ return;
+
+ // Check if there are more than one format type found. In that case do not
+ // emit diagnostic.
+ const clang::IdentifierInfo *AttrType = MissingFormatAttributes[0]->getType();
+ for (unsigned i = 1; i < MissingFormatAttributes.size(); ++i) {
+ if (AttrType != MissingFormatAttributes[i]->getType())
+ return;
+ }
+
+ for (const FormatAttr *FA : MissingFormatAttributes) {
+ // If format index and first-to-check argument index are negative, it means
+ // that this attribute is only saved for multiple format types checking.
+ if (FA->getFormatIdx() < 0 || FA->getFirstArg() < 0)
+ continue;
+
+ // If caller function has format attributes and callee format attribute type
+ // mismatches caller attribute type, do not emit diagnostic.
+ if (FDecl->hasAttr<FormatAttr>() &&
+ !llvm::any_of(FDecl->specific_attrs<FormatAttr>(),
+ [FA](const FormatAttr *FunctionAttr) {
+ return FA->getType() == FunctionAttr->getType();
+ }))
+ continue;
+
+ // Emit diagnostic
+ SourceLocation Loc = FDecl->getFirstDecl()->getLocation();
+ Diag(Loc, diag::warn_missing_format_attribute)
+ << FA->getType() << FDecl
+ << FixItHint::CreateInsertion(Loc,
+ (llvm::Twine("__attribute__((format(") +
+ FA->getType()->getName() + ", " +
+ llvm::Twine(FA->getFormatIdx()) + ", " +
+ llvm::Twine(FA->getFirstArg()) + ")))")
+ .str());
+ }
+}
+
//===----------------------------------------------------------------------===//
// Microsoft specific attribute handlers.
//===----------------------------------------------------------------------===//
diff --git a/clang/test/Sema/attr-format-missing.c b/clang/test/Sema/attr-format-missing.c
new file mode 100644
index 00000000000000..6ca68b635c4b68
--- /dev/null
+++ b/clang/test/Sema/attr-format-missing.c
@@ -0,0 +1,217 @@
+// RUN: %clang_cc1 -fsyntax-only -verify=expected,c_diagnostics -Wmissing-format-attribute %s
+// RUN: %clang_cc1 -fsyntax-only -Wmissing-format-attribute -fdiagnostics-parseable-fixits %s 2>&1 | FileCheck %s
+// RUN: %clang_cc1 -fsyntax-only -x c++ -verify=expected,cpp_diagnostics -Wmissing-format-attribute %s
+// RUN: %clang_cc1 -fsyntax-only -x c++ -verify=expected,cpp_diagnostics -std=c++23 -Wmissing-format-attribute %s
+// RUN: %clang_cc1 -fsyntax-only -x c++ -Wmissing-format-attribute -fdiagnostics-parseable-fixits %s 2>&1 | FileCheck %s
+
+#ifndef __cplusplus
+typedef __CHAR16_TYPE__ char16_t;
+typedef __CHAR32_TYPE__ char32_t;
+typedef __WCHAR_TYPE__ wchar_t;
+#endif
+
+typedef __SIZE_TYPE__ size_t;
+typedef __builtin_va_list va_list;
+
+__attribute__((__format__(__printf__, 1, 2)))
+int printf(const char *, ...); // #printf
+
+__attribute__((__format__(__scanf__, 1, 2)))
+int scanf(const char *, ...); // #scanf
+
+__attribute__((__format__(__printf__, 1, 0)))
+int vprintf(const char *, va_list); // #vprintf
+
+__attribute__((__format__(__scanf__, 1, 0)))
+int vscanf(const char *, va_list); // #vscanf
+
+__attribute__((__format__(__printf__, 2, 0)))
+int vsprintf(char *, const char *, va_list); // #vsprintf
+
+__attribute__((__format__(__printf__, 3, 0)))
+int vsnprintf(char *, size_t, const char *, va_list); // #vsnprintf
+
+#ifndef __cplusplus
+int vwscanf(const wchar_t *, va_list); // #vwscanf
+#endif
+
+__attribute__((__format__(__scanf__, 1, 4)))
+void f1(char *out, const size_t len, const char *format, ... /* args */) // #f1
+{
+ va_list args;
+ vsnprintf(out, len, format, args);
+}
+
+__attribute__((__format__(__printf__, 1, 4)))
+void f2(char *out, const size_t len, const char *format, ... /* args */) // #f2
+{
+ va_list args;
+ vsnprintf(out, len, format, args); // expected-warning@#f2 {{diagnostic behavior may be improved by adding the 'printf' format attribute to the declaration of 'f2'}}
+ // CHECK: fix-it:"{{.*}}":{[[@LINE-4]]:6-[[@LINE-4]]:6}:"__attribute__((format(printf, 3, 4)))"
+}
+
+void f3(char *out, va_list args) // #f3
+{
+ vprintf(out, args); // expected-warning@#f3 {{diagnostic behavior may be improved by adding the 'printf' format attribute to the declaration of 'f3'}}
+ // CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:6-[[@LINE-3]]:6}:"__attribute__((format(printf, 1, 0)))"
+}
+
+void f4(char* out, ... /* args */) // #f4
+{
+ va_list args;
+ vprintf("test", args);
+
+ const char *ch;
+ vprintf(ch, args);
+}
+
+void f5(va_list args) // #f5
+{
+ char *ch;
+ vscanf(ch, args);
+}
+
+void f6(char *out, va_list args) // #f6
+{
+ char *ch;
+ vprintf(ch, args);
+ vprintf("test", args);
+ vprintf(out, args); // expected-warning@#f6 {{diagnostic behavior may be improved by adding the 'printf' format attribute to the declaration of 'f6'}}
+ // CHECK: fix-it:"{{.*}}":{[[@LINE-6]]:6-[[@LINE-6]]:6}:"__attribute__((format(printf, 1, 0)))"
+}
+
+void f7(const char *out, ... /* args */) // #f7
+{
+ va_list args;
+
+ vscanf(out, args); // expected-warning@#f7 {{diagnostic behavior may be improved by adding the 'scanf' format attribute to the declaration of 'f7'}}
+ // CHECK: fix-it:"{{.*}}":{[[@LINE-5]]:6-[[@LINE-5]]:6}:"__attribute__((format(scanf, 1, 2)))"
+}
+
+void f8(const char *out, ... /* args */) // #f8
+{
+ va_list args;
+
+ vscanf(out, args);
+ vprintf(out, args);
+}
+
+void f9(const char out[], ... /* args */) // #f9
+{
+ va_list args;
+ char *ch;
+ vprintf(ch, args);
+ vsprintf(ch, out, args); // expected-warning@#f9 {{diagnostic behavior may be improved by adding the 'printf' format attribute to the declaration of 'f9'}}
+ // CHECK: fix-it:"{{.*}}":{[[@LINE-6]]:6-[[@LINE-6]]:6}:"__attribute__((format(printf, 1, 2)))"
+}
+
+#ifndef __cplusplus
+void f10(const wchar_t *out, ... /* args */) // #f10
+{
+ va_list args;
+ vwscanf(out, args);
+}
+#endif
+
+void f11(const char *out) // #f11
+{
+ va_list args;
+ vscanf(out, args); // expected-warning@#f11 {{diagnostic behavior may be improved by adding the 'scanf' format attribute to the declaration of 'f11'}}
+ // CHECK: fix-it:"{{.*}}":{[[@LINE-4]]:6-[[@LINE-4]]:6}:"__attribute__((format(scanf, 1, 0)))"
+}
+
+void f12(char* out) // #f12
+{
+ va_list args;
+ const char* ch;
+ vsprintf(out, ch, args);
+ vprintf(out, args); // expected-warning@#f12 {{diagnostic behavior may be improved by adding the 'printf' format attribute to the declaration of 'f12'}}
+ // CHECK: fix-it:"{{.*}}":{[[@LINE-6]]:6-[[@LINE-6]]:6}:"__attribute__((format(printf, 1, 0)))"
+}
+
+void f13(const char *out, ... /* args */) // #f13
+{
+ va_list args;
+ printf(out, args);
+}
+
+void f14(char *out, ... /* args */) // #f14
+{
+ va_list args;
+ vscanf(out, args);
+ vprintf(out, args);
+}
+
+void f15(char *out, ... /* args */) // #f15
+{
+ va_list args;
+ vscanf(out, args);
+ {
+ vprintf(out, args);
+ }
+}
+
+void f16(char *out, va_list args) // #f16
+{
+ {
+ vscanf(out, args);
+ vprintf(out, args);
+ }
+}
+
+// expected-warning@#f17 {{diagnostic behavior may be improved by adding the 'scanf' format attribute to the declaration of 'f17'}}
+// CHECK: fix-it:"{{.*}}":{[[@LINE+1]]:6-[[@LINE+1]]:6}:"__attribute__((format(scanf, 1, 2)))"
+void f17(char *out, ... /* args */) // #f17
+{
+ va_list args;
+ vscanf(out, args);
+ {
+ vscanf(out, args);
+ }
+}
+
+void f18(char *ch, const char *out, ... /* args */) // #f18
+{
+ va_list args;
+ vprintf(ch, args); // expected-warning@#f18 {{diagnostic behavior may be improved by adding the 'printf' format attribute to the declaration of 'f18}}
+ // CHECK: fix-it:"{{.*}}":{[[@LINE-4]]:6-[[@LINE-4]]:6}:"__attribute__((format(printf, 1, 3)))"
+ vprintf(out, args); // expected-warning@#f18 {{diagnostic behavior may be improved by adding the 'printf' format attribute to the declaration of 'f18'}}
+ // CHECK: fix-it:"{{.*}}":{[[@LINE-6]]:6-[[@LINE-6]]:6}:"__attribute__((format(printf, 2, 3)))"
+}
+
+typedef va_list tdVaList;
+typedef int tdInt;
+
+void f19(const char *out, ... /* args */) // #f19
+{
+ tdVaList args;
+ vprintf(out, args); // expected-warning@#f19 {{diagnostic behavior may be improved by adding the 'printf' format attribute to the declaration of 'f19'}}
+ // CHECK: fix-it:"{{.*}}":{[[@LINE-4]]:6-[[@LINE-4]]:6}:"__attribute__((format(printf, 1, 2)))"
+}
+
+void f20(const char *out, tdVaList args) // #f20
+{
+ vscanf(out, args); // expected-warning@#f20 {{diagnostic behavior may be improved by adding the 'scanf' format attribute to the declaration of 'f20'}}
+ // CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:6-[[@LINE-3]]:6}:"__attribute__((format(scanf, 1, 0)))"
+}
+
+void f21(const char *out, tdVaList args) // #f21
+{
+ vscanf(out, args);
+ vprintf(out, args);
+}
+
+void f22(char *out, ... /* args */) // #f22
+{
+ va_list args;
+ char *ch;
+ vscanf(ch, args);
+ vprintf(out, args);
+}
+
+void f23(char *out, ... /* args */) // #f23
+{
+ va_list args;
+ vscanf("%s", args);
+ vprintf(out, args);
+}
diff --git a/clang/test/Sema/attr-format-missing.cpp b/clang/test/Sema/attr-format-missing.cpp
new file mode 100644
index 00000000000000..c0e6e91d8bd447
--- /dev/null
+++ b/clang/test/Sema/attr-format-missing.cpp
@@ -0,0 +1,180 @@
+// RUN: %clang_cc1 -fsyntax-only -verify -Wmissing-format-attribute %s
+// RUN: %clang_cc1 -fsyntax-only -verify -std=c++23 -Wmissing-format-attribute %s
+// RUN: not %clang_cc1 -fsyntax-only -Wmissing-format-attribute -fdiagnostics-parseable-fixits %s 2>&1 | FileCheck %s
+// RUN: not %clang_cc1 -fsyntax-only -Wmissing-format-attribute -fdiagnostics-parseable-fixits -std=c++23 %s 2>&1
+// FileCheck %s --check-prefixes=CHECK,CHECK-EXPLICIT-THIS-PARAMETER
+
+typedef __SIZE_TYPE__ size_t;
+typedef __builtin_va_list va_list;
+
+namespace std
+{
+ template<class Elem> struct basic_string_view {};
+ template<class Elem> struct basic_string {
+ const Elem *c_str() const noexcept;
+ basic_string(const basic_string_view<Elem> SW);
+ };
+
+ using string = basic_string<char>;
+ using wstring = basic_string<wchar_t>;
+ using string_view = basic_string_view<char>;
+ using wstring_view = basic_string_view<wchar_t>;
+}
+
+__attribute__((__format__(__printf__, 1, 2)))
+int printf(const char *, ...); // #printf
+
+__attribute__((__format__(__scanf__, 1, 2)))
+int scanf(const char *, ...); // #scanf
+
+__attribute__((__format__(__printf__, 1, 0)))
+int vprintf(const char *, va_list); // #vprintf
+
+__attribute__((__format__(__scanf__, 1, 0)))
+int vscanf(const char *, va_list); // #vscanf
+
+__attribute__((__format__(__printf__, 2, 0)))
+int vsprintf(char *, const char *, va_list); // #vsprintf
+
+__attribute__((__format__(__printf__, 3, 0)))
+int vsnprintf(char *, size_t, const char *, va_list); // #vsnprintf
+
+int vwprintf(const wchar_t *, va_list); // #vwprintf
+
+void f1(const std::string &str, ... /* args */) // #f1
+{
+ va_list args;
+ vscanf(str.c_str(), args);
+}
+
+__attribute__((format(printf, 1, 2))) // expected-error {{format argument not a string type}}
+void f2(const std::string &str, ... /* args */); // #f2
+
+void f3(std::string_view str, ... /* args */) // #f3
+{
+ va_list args;
+ vscanf(std::string(str).c_str(), args);
+}
+
+__attribute__((format(printf, 1, 2))) // expected-error {{format argument not a string type}}
+void f4(std::string_view str, ... /* args */); // #f4
+
+void f5(const std::wstring &str, ... /* args */) // #f5
+{
+ va_list args;
+ vwprintf(str.c_str(), args);
+}
+
+__attribute__((format(printf, 1, 2))) // expected-error {{format argument not a string type}}
+void f6(const std::wstring &str, ... /* args */); // #f6
+
+void f7(std::wstring_view str, ... /* args */) // #f7
+{
+ va_list args;
+ vwprintf(std::wstring(str).c_str(), args);
+}
+
+__attribute__((format(printf, 1, 2))) // expected-error {{format argument not a string type}}
+void f8(std::wstring_view str, ... /* args */); // #f8
+
+struct S1
+{
+ void fn1(const char *out, ... /* args */) // #S1_fn1
+ {
+ va_list args;
+ vscanf(out, args); // expected-warning@#S1_fn1 {{diagnostic behavior may be improved by adding the 'scanf' format attribute to the declaration of 'fn1'}}
+ // CHECK: fix-it:"{{.*}}":{[[@LINE-4]]:10-[[@LINE-4]]:10}:"__attribute__((format(scanf, 2, 3)))"
+ }
+
+ __attribute__((format(scanf, 2, 0)))
+ void fn2(const char *out, va_list args); // #S1_fn2
+
+ void fn3(const char *out, ... /* args */); // #S1_fn3
+
+#if __has_extension(cxx_explicit_this_parameter)
+ void fn4(this S1& explicitThis, const char *out, va_list args) // #S1_fn4
+ {
+ explicitThis.fn2(out, args); // expected-warning@#S1_fn4 {{diagnostic behavior may be improved by adding the 'scanf' format attribute to the declaration of 'fn4'}}
+ // CHECK-EXPLICIT-THIS-PARAMETER: fix-it:"{{.*}}":{[[@LINE-3]]:10-[[@LINE-3]]:10}:"__attribute__((format(scanf, 2, 0)))"
+ }
+#endif
+};
+
+void S1::fn3(const char *out, ... /* args */)
+{
+ va_list args;
+ fn2(out, args); // expected-warning@#S1_fn3 {{diagnostic behavior may be improved by adding the 'scanf' format attribute to the declaration of 'fn3'}}
+ // CHECK: fix-it:"{{.*}}":{[[@LINE-4]]:10-[[@LINE-4]]:10}:"__attribute__((format(scanf, 2, 3)))"
+}
+
+union U1
+{
+ __attribute__((format(printf, 2, 0)))
+ void fn1(const char *out, va_list args); // #U1_fn1
+
+ void fn2(const char *out, ... /* args */) // #U1_fn2
+ {
+ va_list args;
+ fn1(out, args); // expected-warning@#U1_fn2 {{diagnostic behavior may be improved by adding the 'printf' format attribute to the declaration of 'fn2'}}
+ // CHECK: fix-it:"{{.*}}":{[[@LINE-4]]:10-[[@LINE-4]]:10}:"__attribute__((format(printf, 2, 3)))"
+ }
+
+#if __has_extension(cxx_explicit_this_parameter)
+ void fn3(this U1&, const char *out) // #U1_fn3
+ {
+ va_list args;
+ vprintf(out, args); // expected-warning@#U1_fn3 {{diagnostic behavior may be improved by adding the 'printf' format attribute to the declaration of 'fn3'}}
+ // CHECK-EXPLICIT-THIS-PARAMETER: fix-it:"{{.*}}":{[[@LINE-4]]:10-[[@LINE-4]]:10}:"__attribute__((format(printf, 2, 0)))"
+ }
+#endif
+};
+
+class C1
+{
+ __attribute__((format(printf, 3, 0)))
+ void fn1(const int n, const char *out, va_list args); // #C1_fn1
+
+ void fn2(const char *out, const int n, ... /* args */) // #C1_fn2
+ {
+ va_list args;
+ fn1(n, out, args); // expected-warning@#C1_fn2 {{diagnostic behavior may be improved by adding the 'printf' format attribute to the declaration of 'fn2'}}
+ // CHECK: fix-it:"{{.*}}":{[[@LINE-4]]:10-[[@LINE-4]]:10}:"__attribute__((format(printf, 2, 4)))"
+ }
+
+#if __has_extension(cxx_explicit_this_parameter)
+ void fn3(this const C1&, const char *out, va_list args) // #C1_fn3
+ {
+ vscanf(out, args); // expected-warning@#C1_fn3 {{diagnostic behavior may be improved by adding the 'scanf' format attribute to the declaration of 'fn3'}}
+ // CHECK-EXPLICIT-THIS-PARAMETER: fix-it:"{{.*}}":{[[@LINE-3]]:10-[[@LINE-3]]:10}:"__attribute__((format(scanf, 2, 0)))"
+ }
+#endif
+
+ C1(const int n, const char *out) //#C1_C1a
+ {
+ va_list args;
+ fn1(n, out, args); // expected-warning@#C1_C1a {{diagnostic behavior may be improved by adding the 'printf' format attribute to the declaration of 'C1'}}
+ // CHECK: fix-it:"{{.*}}":{[[@LINE-4]]:5-[[@LINE-4]]:5}:"__attribute__((format(printf, 3, 0)))"
+ }
+
+ C1(const char *out, ... /* args */) // #C1_C1b
+ {
+ va_list args;
+ vprintf(out, args); // expected-warning@#C1_C1b {{diagnostic behavior may be improved by adding the 'printf' format attribute to the declaration of 'C1'}}
+ // CHECK: fix-it:"{{.*}}":{[[@LINE-4]]:5-[[@LINE-4]]:5}:"__attribute__((format(printf, 2, 3)))"
+ }
+
+ ~C1() // #d_C1
+ {
+ const char *out;
+ va_list args;
+ vprintf(out, args);
+ }
+};
+
+// TODO: implement for templates
+template <int N>
+void func(char (&str)[N], ... /* args */) // #func
+{
+ va_list args;
+ vprintf(str, args);
+}
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