Revert "[HWASan] remove incorrectly inferred attributes" (#106622)

Reverts #106565

Broke clang tests

Author: fmayer

llvm/lib/Transforms/Instrumentation/HWAddressSanitizer.cpp

@@ -598,24 +598,6 @@ void HWAddressSanitizer::initializeModule() {
   LLVM_DEBUG(dbgs() << "Init " << M.getName() << "\n");
   TargetTriple = Triple(M.getTargetTriple());
 
-  for (auto &F : M.functions()) {
-    // Remove memory attributes that are invalid with HWASan.
-    // HWASan checks read from shadow, which invalidates memory(argmem: *)
-    // Short granule checks on function arguments read from the argument memory
-    // (last byte of the granule), which invalidates writeonly.
-    //
-    // This is not only true for sanitized functions, because AttrInfer can
-    // infer those attributes on libc functions, which is not true if those
-    // are instrumented (Android) or intercepted.
-
-    // nobuiltin makes sure later passes don't restore assumptions about
-    // the function.
-    F.addFnAttr(llvm::Attribute::NoBuiltin);
-    F.removeFnAttr(llvm::Attribute::Memory);
-    for (auto &A : F.args())
-      A.removeAttr(llvm::Attribute::WriteOnly);
-  }
-
   // x86_64 currently has two modes:
   // - Intel LAM (default)
   // - pointer aliasing (heap only)
@@ -1640,6 +1622,14 @@ void HWAddressSanitizer::sanitizeFunction(Function &F,
 
   assert(!ShadowBase);
 
+  // Remove memory attributes that are about to become invalid.
+  // HWASan checks read from shadow, which invalidates memory(argmem: *)
+  // Short granule checks on function arguments read from the argument memory
+  // (last byte of the granule), which invalidates writeonly.
+  F.removeFnAttr(llvm::Attribute::Memory);
+  for (auto &A : F.args())
+    A.removeAttr(llvm::Attribute::WriteOnly);
+
   BasicBlock::iterator InsertPt = F.getEntryBlock().begin();
   IRBuilder<> EntryIRB(&F.getEntryBlock(), InsertPt);
   emitPrologue(EntryIRB,

llvm/test/Instrumentation/HWAddressSanitizer/RISCV/alloca.ll

@@ -194,7 +194,7 @@ entry:
 
 define i8 @test_load_noattr(ptr %a) {
 ; CHECK-LABEL: define i8 @test_load_noattr
-; CHECK-SAME: (ptr [[A:%.*]]) #[[ATTR1:[0-9]+]] {
+; CHECK-SAME: (ptr [[A:%.*]]) {
 ; CHECK-NEXT:  entry:
 ; CHECK-NEXT:    [[B:%.*]] = load i8, ptr [[A]], align 4
 ; CHECK-NEXT:    ret i8 [[B]]
@@ -206,7 +206,7 @@ entry:
 
 define i8 @test_load_notmyattr(ptr %a) sanitize_address {
 ; CHECK-LABEL: define i8 @test_load_notmyattr
-; CHECK-SAME: (ptr [[A:%.*]]) #[[ATTR2:[0-9]+]] {
+; CHECK-SAME: (ptr [[A:%.*]]) #[[ATTR1:[0-9]+]] {
 ; CHECK-NEXT:  entry:
 ; CHECK-NEXT:    [[B:%.*]] = load i8, ptr [[A]], align 4
 ; CHECK-NEXT:    ret i8 [[B]]

llvm/test/Instrumentation/HWAddressSanitizer/RISCV/basic.ll

@@ -18,7 +18,7 @@ target triple = "x86_64-unknown-linux-gnu"
 ; CHECK: @__hwasan_shadow = external global [0 x i8]
 ;.
 define i8 @test_load8(ptr %a) sanitize_hwaddress {
-; CHECK: Function Attrs: nobuiltin sanitize_hwaddress
+; CHECK: Function Attrs: sanitize_hwaddress
 ; CHECK-LABEL: define i8 @test_load8
 ; CHECK-SAME: (ptr [[A:%.*]]) #[[ATTR0:[0-9]+]] {
 ; CHECK-NEXT:  entry:
@@ -33,7 +33,7 @@ entry:
   ret i8 %b
 }
 ;.
-; CHECK: attributes #[[ATTR0]] = { nobuiltin sanitize_hwaddress }
+; CHECK: attributes #[[ATTR0]] = { sanitize_hwaddress }
 ; CHECK: attributes #[[ATTR1:[0-9]+]] = { nounwind }
 ;.
 ; CHECK: [[META0]] = !{ptr @hwasan.note}

llvm/test/Instrumentation/HWAddressSanitizer/alloca.ll

@@ -11,5 +11,5 @@ entry:
   ret void
 }
 
-; CHECK: attributes #0 = { nobuiltin sanitize_hwaddress uwtable }
+; CHECK: attributes #0 = { sanitize_hwaddress uwtable }
 attributes #0 = { sanitize_hwaddress memory(argmem: write) uwtable }