https://github.com/PlutoDog95 created https://github.com/llvm/llvm-project/pull/196323
## Summary Suppress EnumCastOutOfRange diagnostics emitted from system headers. The checker already receives locations correctly classified as system headers by SourceManager, but it did not suppress diagnostics for them. This caused warnings to be emitted from libraries included through -isystem, such as Boost.Regex. Add a system-header guard in reportWarning() and add a regression test. ## Testing ```bash ./bin/llvm-lit ../clang/test/Analysis/enum-cast-out-of-range* >From a488e1500568f16ad796e1b331c402f6d0dd7190 Mon Sep 17 00:00:00 2001 From: Vineet Agarwal <[email protected]> Date: Thu, 7 May 2026 19:29:58 +0530 Subject: [PATCH] [analyzer] Suppress EnumCastOutOfRange diagnostics in system headers Suppress EnumCastOutOfRange warnings emitted from system headers. The checker already receives locations correctly classified as system headers by SourceManager, but it did not suppress diagnostics for them. This caused warnings to be emitted from libraries included through -isystem, such as Boost.Regex. Add a system-header guard in reportWarning() and add a regression test. Signed-off-by: Vineet Agarwal <[email protected]> --- .../Checkers/EnumCastOutOfRangeChecker.cpp | 10 +++++++--- clang/test/Analysis/Inputs/enum-system-header.h | 8 ++++++++ .../enum-cast-out-of-range-system-header.cpp | 12 ++++++++++++ 3 files changed, 27 insertions(+), 3 deletions(-) create mode 100644 clang/test/Analysis/Inputs/enum-system-header.h create mode 100644 clang/test/Analysis/enum-cast-out-of-range-system-header.cpp diff --git a/clang/lib/StaticAnalyzer/Checkers/EnumCastOutOfRangeChecker.cpp b/clang/lib/StaticAnalyzer/Checkers/EnumCastOutOfRangeChecker.cpp index 76a1470aaac44..32a73a1d5c44f 100644 --- a/clang/lib/StaticAnalyzer/Checkers/EnumCastOutOfRangeChecker.cpp +++ b/clang/lib/StaticAnalyzer/Checkers/EnumCastOutOfRangeChecker.cpp @@ -85,8 +85,13 @@ void EnumCastOutOfRangeChecker::reportWarning(CheckerContext &C, const CastExpr *CE, const EnumDecl *E) const { assert(E && "valid EnumDecl* is expected"); - if (const ExplodedNode *N = C.generateNonFatalErrorNode()) { - std::string ValueStr = "", NameStr = "the enum"; + auto &SM = C.getSourceManager(); + + if (SM.isInSystemHeader(CE->getExprLoc())) + return; + + if (const ExplodedNode *N = C.generateNonFatalErrorNode()) { + std::string ValueStr = "", NameStr = "the enum"; // Try to add details to the message: const auto ConcreteValue = @@ -101,7 +106,6 @@ void EnumCastOutOfRangeChecker::reportWarning(CheckerContext &C, std::string Msg = formatv("The value{0} provided to the cast expression is " "not in the valid range of values for {1}", ValueStr, NameStr); - auto BR = std::make_unique<PathSensitiveBugReport>(EnumValueCastOutOfRange, Msg, N); bugreporter::trackExpressionValue(N, CE->getSubExpr(), *BR); diff --git a/clang/test/Analysis/Inputs/enum-system-header.h b/clang/test/Analysis/Inputs/enum-system-header.h new file mode 100644 index 0000000000000..53c6bdac24093 --- /dev/null +++ b/clang/test/Analysis/Inputs/enum-system-header.h @@ -0,0 +1,8 @@ +enum MyEnum { + A = 1, + B = 2 +}; + +static inline MyEnum bad_cast(int x) { + return (MyEnum)x; +} diff --git a/clang/test/Analysis/enum-cast-out-of-range-system-header.cpp b/clang/test/Analysis/enum-cast-out-of-range-system-header.cpp new file mode 100644 index 0000000000000..073cde677bcd1 --- /dev/null +++ b/clang/test/Analysis/enum-cast-out-of-range-system-header.cpp @@ -0,0 +1,12 @@ +// RUN: %clang_analyze_cc1 \ +// RUN: -analyzer-checker=core,optin.core.EnumCastOutOfRange \ +// RUN: -isystem %S/Inputs \ +// RUN: -verify %s + +#include "enum-system-header.h" + +void test() { + bad_cast(100); +} + +// expected-no-diagnostics _______________________________________________ cfe-commits mailing list [email protected] https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
