[Sanitizer][Ignorelist] Expanding =sanitize to global.

[qinkunbao]

See #139128
If multiple entries match the source, than the latest entry takes the
precedence.`

[llvmbot]

@llvm/pr-subscribers-clang

Author: Qinkun Bao (qinkunbao)

Changes

See #139128
If multiple entries match the source, than the latest entry takes the
precedence.`

---

Full diff: https://github.com/llvm/llvm-project/pull/142456.diff

1 Files Affected:

• (added) clang/test/CodeGen/ubsan-global-ignorelist.test (+39)

diff --git a/clang/test/CodeGen/ubsan-global-ignorelist.test b/clang/test/CodeGen/ubsan-global-ignorelist.test
new file mode 100644
index 0000000000000..8d7812217f331
--- /dev/null
+++ b/clang/test/CodeGen/ubsan-global-ignorelist.test
@@ -0,0 +1,39 @@
+// RUN: rm -rf %t
+// RUN: split-file %s %t
+
+// RUN: %clang -target x86_64-unknown-linux-gnu -S -emit-llvm -fsanitize=bounds %t/test.c -o - | FileCheck %s --check-prefixes=CHECK,SANITIZE
+// RUN: %clang -target x86_64-unknown-linux-gnu -S -emit-llvm -fsanitize=bounds -fsanitize-ignorelist=%t/order-0.ignorelist %t/test.c -o - | FileCheck %s --check-prefixes=CHECK,IGNORE
+// RUN: %clang -target x86_64-unknown-linux-gnu -S -emit-llvm -fsanitize=bounds -fsanitize-ignorelist=%t/order-1.ignorelist %t/test.c -o - | FileCheck %s --check-prefixes=CHECK,SANITIZE
+// RUN: %clang -target x86_64-unknown-linux-gnu -S -emit-llvm -fsanitize=bounds -fsanitize-ignorelist=%t/order-2.ignorelist %t/test.c -o - | FileCheck %s --check-prefixes=CHECK,IGNORE
+// RUN: %clang -target x86_64-unknown-linux-gnu -S -emit-llvm -fsanitize=bounds -fsanitize-ignorelist=%t/order-3.ignorelist %t/test.c -o - | FileCheck %s --check-prefixes=CHECK,SANITIZE
+
+// The same type can appear multiple times within an ignorelist. Any ``=sanitize`` type
+// entries enable sanitizer instrumentation, even if it was ignored by entries before.
+// If multiple entries match the source, then the latest entry takes the
+// precedence.
+
+//--- order-0.ignorelist
+global:global_array
+
+//--- order-1.ignorelist
+global:global_array
+global:global_array=sanitize
+
+//--- order-2.ignorelist
+global:*
+global:global_array=sanitize
+global:global_array
+
+//--- order-3.ignorelist
+global:*
+global:global_array=sanitize
+global:global*
+global:*array=sanitize
+
+//--- test.c
+unsigned global_array[100] = {-1};
+
+// CHECK-LABEL: define dso_local i32 @test
+// IGNORE-NOT: call void @__ubsan_handle_out_of_bounds
+// SANITIZE: call void @__ubsan_handle_out_of_bounds
+int test(int i) { return global_array[i]; }