https://github.com/moorabbit created
https://github.com/llvm/llvm-project/pull/151348
Support `__has_feature(cfi)` to check for control flow integrity sanitizers.
Fixes #151022
>From fe34b28a97875ed27b8888a768942d9624655950 Mon Sep 17 00:00:00 2001
From: moorabbit <moorab...@proton.me>
Date: Wed, 30 Jul 2025 10:50:58 -0400
Subject: [PATCH] [Clang][Basic] Enable `__has_feature(cfi)`
Support `__has_feature(cfi)` to check for control flow integrity sanitizers.
---
clang/include/clang/Basic/Features.def | 1 +
clang/include/clang/Basic/Sanitizers.def | 2 +-
clang/test/Lexer/has_feature_cfi.c | 18 ++++++++++++++++++
3 files changed, 20 insertions(+), 1 deletion(-)
create mode 100644 clang/test/Lexer/has_feature_cfi.c
diff --git a/clang/include/clang/Basic/Features.def
b/clang/include/clang/Basic/Features.def
index 72f23614aef11..4beb9a51dcf0b 100644
--- a/clang/include/clang/Basic/Features.def
+++ b/clang/include/clang/Basic/Features.def
@@ -303,6 +303,7 @@ FEATURE(is_trivially_assignable, LangOpts.CPlusPlus)
FEATURE(is_trivially_constructible, LangOpts.CPlusPlus)
FEATURE(is_trivially_copyable, LangOpts.CPlusPlus)
FEATURE(is_union, LangOpts.CPlusPlus)
+FEATURE(cfi, LangOpts.Sanitize.hasOneOf(SanitizerKind::CFI))
FEATURE(kcfi, LangOpts.Sanitize.has(SanitizerKind::KCFI))
FEATURE(kcfi_arity, LangOpts.Sanitize.has(SanitizerKind::KCFI))
FEATURE(modules, LangOpts.Modules)
diff --git a/clang/include/clang/Basic/Sanitizers.def
b/clang/include/clang/Basic/Sanitizers.def
index 1d0e97cc7fb4c..aad758ceb9d40 100644
--- a/clang/include/clang/Basic/Sanitizers.def
+++ b/clang/include/clang/Basic/Sanitizers.def
@@ -134,7 +134,7 @@ SANITIZER("cfi-nvcall", CFINVCall)
SANITIZER("cfi-vcall", CFIVCall)
SANITIZER_GROUP("cfi", CFI,
CFIDerivedCast | CFIICall | CFIMFCall | CFIUnrelatedCast |
- CFINVCall | CFIVCall)
+ CFINVCall | CFIVCall | CFICastStrict)
// Kernel Control Flow Integrity
SANITIZER("kcfi", KCFI)
diff --git a/clang/test/Lexer/has_feature_cfi.c
b/clang/test/Lexer/has_feature_cfi.c
new file mode 100644
index 0000000000000..df472944e6d9e
--- /dev/null
+++ b/clang/test/Lexer/has_feature_cfi.c
@@ -0,0 +1,18 @@
+// RUN: %clang_cc1 -E -fsanitize=cfi-cast-strict -o - %s | FileCheck
--check-prefix=CHECK-CFISAN %s
+// RUN: %clang_cc1 -E -fsanitize=cfi-derived-cast -o - %s | FileCheck
--check-prefix=CHECK-CFISAN %s
+// RUN: %clang_cc1 -E -fsanitize=cfi-icall -o - %s | FileCheck
--check-prefix=CHECK-CFISAN %s
+// RUN: %clang_cc1 -E -fsanitize=cfi-mfcall -o - %s | FileCheck
--check-prefix=CHECK-CFISAN %s
+// RUN: %clang_cc1 -E -fsanitize=cfi-unrelated-cast -o - %s | FileCheck
--check-prefix=CHECK-CFISAN %s
+// RUN: %clang_cc1 -E -fsanitize=cfi-nvcall -o - %s | FileCheck
--check-prefix=CHECK-CFISAN %s
+// RUN: %clang_cc1 -E -fsanitize=cfi-vcall -o - %s | FileCheck
--check-prefix=CHECK-CFISAN %s
+// RUN: %clang_cc1 -E %s -o - | FileCheck --check-prefix=CHECK-NO-CFISAN %s
+
+#if __has_feature(cfi)
+int CFISanitizerEnabled();
+#else
+int CFISanitizerDisabled();
+#endif
+
+// CHECK-CFISAN: CFISanitizerEnabled
+// CHECK-NO-CFISAN: CFISanitizerDisabled
+
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