[asan] Add support for disable_sanitizer_instrumentation attribute

For ASan this will effectively serve as a synonym for
__attribute__((no_sanitize("address")))

This is a reland of https://reviews.llvm.org/D114421

Reviewed By: melver, eugenis

Differential Revision: https://reviews.llvm.org/D119726

1 files changed, 16 insertions, 14 deletions

diff --git a/clang/lib/CodeGen/CodeGenFunction.cpp b/clang/lib/CodeGen/CodeGenFunction.cpp
index ba07765..bd29842 100644
--- a/clang/lib/CodeGen/CodeGenFunction.cpp
+++ b/clang/lib/CodeGen/CodeGenFunction.cpp
@@ -383,9 +383,6 @@ void CodeGenFunction::FinishFunction(SourceLocation EndLoc) {
                        "__cyg_profile_func_exit");
   }
 
-  if (ShouldSkipSanitizerInstrumentation())
-    CurFn->addFnAttr(llvm::Attribute::DisableSanitizerInstrumentation);
-
   // Emit debug descriptor for function end.
   if (CGDebugInfo *DI = getDebugInfo())
     DI->EmitFunctionEnd(Builder, CurFn);
@@ -767,17 +764,22 @@ void CodeGenFunction::StartFunction(GlobalDecl GD, QualType RetTy,
       Fn->addFnAttr(llvm::Attribute::NoSanitizeCoverage);
   }
 
-  // Apply sanitizer attributes to the function.
-  if (SanOpts.hasOneOf(SanitizerKind::Address | SanitizerKind::KernelAddress))
-    Fn->addFnAttr(llvm::Attribute::SanitizeAddress);
-  if (SanOpts.hasOneOf(SanitizerKind::HWAddress | SanitizerKind::KernelHWAddress))
-    Fn->addFnAttr(llvm::Attribute::SanitizeHWAddress);
-  if (SanOpts.has(SanitizerKind::MemTag))
-    Fn->addFnAttr(llvm::Attribute::SanitizeMemTag);
-  if (SanOpts.has(SanitizerKind::Thread))
-    Fn->addFnAttr(llvm::Attribute::SanitizeThread);
-  if (SanOpts.hasOneOf(SanitizerKind::Memory | SanitizerKind::KernelMemory))
-    Fn->addFnAttr(llvm::Attribute::SanitizeMemory);
+  if (ShouldSkipSanitizerInstrumentation()) {
+    CurFn->addFnAttr(llvm::Attribute::DisableSanitizerInstrumentation);
+  } else {
+    // Apply sanitizer attributes to the function.
+    if (SanOpts.hasOneOf(SanitizerKind::Address | SanitizerKind::KernelAddress))
+      Fn->addFnAttr(llvm::Attribute::SanitizeAddress);
+    if (SanOpts.hasOneOf(SanitizerKind::HWAddress |
+                         SanitizerKind::KernelHWAddress))
+      Fn->addFnAttr(llvm::Attribute::SanitizeHWAddress);
+    if (SanOpts.has(SanitizerKind::MemTag))
+      Fn->addFnAttr(llvm::Attribute::SanitizeMemTag);
+    if (SanOpts.has(SanitizerKind::Thread))
+      Fn->addFnAttr(llvm::Attribute::SanitizeThread);
+    if (SanOpts.hasOneOf(SanitizerKind::Memory | SanitizerKind::KernelMemory))
+      Fn->addFnAttr(llvm::Attribute::SanitizeMemory);
+  }
   if (SanOpts.has(SanitizerKind::SafeStack))
     Fn->addFnAttr(llvm::Attribute::SafeStack);
   if (SanOpts.has(SanitizerKind::ShadowCallStack))