[hwasan] Workaround unsupported AssignmentTrackingPass (llvm#76547)

Temporarily fix for issue llvm#76545

Hwasan does not attach tags to @llvm.dbg.assign. It's not clear if we
can attach tags to @llvm.dbg.assign.

For now we just disable the path replacing llvm.dbg.declare with
llvm.dbg.assign.
It may reduce the quality of interactive debugging with HWASAN, but
usually it's
a smaller priority for sanitizers than the quality if reports.

Author: vitalybuka

compiler-rt/test/hwasan/TestCases/stack-overflow.c

@@ -1,4 +1,5 @@
-// RUN: %clang_hwasan -g %s -o %t && not %run %t 2>&1 | FileCheck %s
+// RUN: %clang_hwasan -O0 -g %s -o %t && not %run %t 2>&1 | FileCheck %s
+// RUN: %clang_hwasan -O3 -g %s -o %t && not %run %t 2>&1 | FileCheck %s
 
 // Stack histories currently are not recorded on x86.
 // XFAIL: target=x86_64{{.*}}

compiler-rt/test/hwasan/TestCases/stack-uar.c

@@ -1,5 +1,6 @@
 // Tests use-after-return detection and reporting.
-// RUN: %clang_hwasan -g %s -o %t && not %run %t 2>&1 | FileCheck %s
+// RUN: %clang_hwasan -O0 -g %s -o %t && not %run %t 2>&1 | FileCheck %s
+// RUN: %clang_hwasan -O3 -g %s -o %t && not %run %t 2>&1 | FileCheck %s
 // RUN: %clang_hwasan -g %s -o %t && not %env_hwasan_opts=symbolize=0 %run %t 2>&1 | FileCheck %s --check-prefix=NOSYM
 
 // Run the same test as above, but using the __hwasan_add_frame_record libcall.

compiler-rt/test/hwasan/TestCases/stack-uas.c

@@ -1,5 +1,6 @@
 // Tests use-after-scope detection and reporting.
-// RUN: %clang_hwasan -g %s -o %t && not %run %t 2>&1 | FileCheck %s
+// RUN: %clang_hwasan -O0 -g %s -o %t && not %run %t 2>&1 | FileCheck %s
+// RUN: %clang_hwasan -O2 -g %s -o %t && not %run %t 2>&1 | FileCheck %s
 // RUN: %clang_hwasan -g %s -o %t && not %env_hwasan_opts=symbolize=0 %run %t 2>&1 | FileCheck %s --check-prefix=NOSYM
 
 // RUN: %clang_hwasan -mllvm -hwasan-use-after-scope=false -g %s -o %t && %run %t 2>&1

llvm/lib/IR/DebugInfo.cpp

@@ -2115,6 +2115,10 @@ bool AssignmentTrackingPass::runOnFunction(Function &F) {
   if (F.hasFnAttribute(Attribute::OptimizeNone))
     return /*Changed*/ false;
 
+  // FIXME: https://github.com/llvm/llvm-project/issues/76545
+  if (F.hasFnAttribute(Attribute::SanitizeHWAddress))
+    return /*Changed*/ false;
+
   bool Changed = false;
   auto *DL = &F.getParent()->getDataLayout();
   // Collect a map of {backing storage : dbg.declares} (currently "backing

llvm/test/DebugInfo/Generic/assignment-tracking/declare-to-assign/hwasan.ll

@@ -0,0 +1,35 @@
+; RUN: opt %s -S -passes=declare-to-assign -o - | FileCheck %s
+
+; CHECK: call void @llvm.dbg.declare
+
+define dso_local void @f() sanitize_hwaddress !dbg !9 {
+entry:
+  %a = alloca i32, align 4
+  call void @llvm.dbg.declare(metadata ptr %a, metadata !13, metadata !DIExpression()), !dbg !16
+  ret void, !dbg !17
+}
+
+declare void @llvm.dbg.declare(metadata, metadata, metadata)
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!2, !3, !4, !5, !6, !7}
+!llvm.ident = !{!8}
+
+!0 = distinct !DICompileUnit(language: DW_LANG_C11, file: !1, producer: "clang version 17.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, splitDebugInlining: false, nameTableKind: None)
+!1 = !DIFile(filename: "test.c", directory: "/")
+!2 = !{i32 7, !"Dwarf Version", i32 5}
+!3 = !{i32 2, !"Debug Info Version", i32 3}
+!4 = !{i32 1, !"wchar_size", i32 4}
+!5 = !{i32 8, !"PIC Level", i32 2}
+!6 = !{i32 7, !"PIE Level", i32 2}
+!7 = !{i32 7, !"uwtable", i32 2}
+!8 = !{!"clang version 17.0.0"}
+!9 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 1, type: !10, scopeLine: 1, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !12)
+!10 = !DISubroutineType(types: !11)
+!11 = !{null}
+!12 = !{!13}
+!13 = !DILocalVariable(name: "a", scope: !9, file: !1, line: 1, type: !14)
+!14 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+!15 = !DILocation(line: 1, column: 12, scope: !9)
+!16 = !DILocation(line: 1, column: 16, scope: !9)
+!17 = !DILocation(line: 1, column: 19, scope: !9)