| ; Test alloca instrumentation. |
| ; |
| ; RUN: opt < %s -passes=hwasan -S | FileCheck %s --check-prefixes=CHECK,NO-UAR-TAGS |
| ; RUN: opt < %s -passes=hwasan -hwasan-uar-retag-to-zero=0 -S | FileCheck %s --check-prefixes=CHECK,UAR-TAGS |
| |
| target datalayout = "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128" |
| target triple = "x86_64-unknown-linux-gnu" |
| |
| declare void @use32(ptr) |
| |
| define void @test_alloca() sanitize_hwaddress { |
| ; CHECK-LABEL: @test_alloca( |
| ; CHECK: %[[FP:[^ ]*]] = call ptr @llvm.frameaddress.p0(i32 0) |
| ; CHECK: %[[A:[^ ]*]] = ptrtoint ptr %[[FP]] to i64 |
| ; CHECK: %[[B:[^ ]*]] = lshr i64 %[[A]], 20 |
| ; CHECK: %[[A_XOR_B:[^ ]*]] = xor i64 %[[A]], %[[B]] |
| ; CHECK: %[[BASE_TAG:[^ ]*]] = and i64 %[[A_XOR_B]], 63 |
| |
| ; CHECK: %[[X:[^ ]*]] = alloca { i32, [12 x i8] }, align 16 |
| ; CHECK: %[[X_TAG:[^ ]*]] = xor i64 %[[BASE_TAG]], 0 |
| ; CHECK: %[[X1:[^ ]*]] = ptrtoint ptr %[[X]] to i64 |
| ; CHECK: %[[C:[^ ]*]] = shl i64 %[[X_TAG]], 57 |
| ; CHECK: %[[D:[^ ]*]] = or i64 %[[X1]], %[[C]] |
| ; CHECK: %[[X_HWASAN:[^ ]*]] = inttoptr i64 %[[D]] to ptr |
| |
| ; CHECK: %[[X_TAG2:[^ ]*]] = trunc i64 %[[X_TAG]] to i8 |
| ; CHECK: call void @__hwasan_tag_memory(ptr %[[X]], i8 %[[X_TAG2]], i64 16) |
| |
| ; CHECK: call void @use32(ptr nonnull %[[X_HWASAN]]) |
| |
| ; UAR-TAGS: %[[BASE_TAG_COMPL:[^ ]*]] = xor i64 %[[BASE_TAG]], 63 |
| ; UAR-TAGS: %[[X_TAG_UAR:[^ ]*]] = trunc i64 %[[BASE_TAG_COMPL]] to i8 |
| ; NO-UAR-TAGS: call void @__hwasan_tag_memory(ptr %[[X]], i8 0, i64 16) |
| ; UAR-TAGS: call void @__hwasan_tag_memory(ptr %[[X]], i8 %[[X_TAG_UAR]], i64 16) |
| ; CHECK: ret void |
| |
| |
| entry: |
| %x = alloca i32, align 4 |
| call void @use32(ptr nonnull %x) |
| ret void |
| } |
