Subzero: Implemented codegen for poisoning and unpoisoning stack redzones

tests_lit/asan_tests/multiple_returns.ll

Index: tests_lit/asan_tests/multiple_returns.ll
diff --git a/tests_lit/asan_tests/multiple_returns.ll b/tests_lit/asan_tests/multiple_returns.ll
index 5575c4bc06f50256c8fda01c7f512a153b6d9b57..ec5ed6ade27a236fb4bcab369fee95daab25515f 100644
--- a/tests_lit/asan_tests/multiple_returns.ll
+++ b/tests_lit/asan_tests/multiple_returns.ll
@@ -16,27 +16,38 @@ no:
   ret void
 }
 
-; DUMP-LABEL: ================ Instrumented CFG ================
+; DUMP-LABEL:================ Instrumented CFG ================
 ; DUMP-NEXT: define internal void @ret_twice(i32 %condarg) {
 ; DUMP-NEXT: __0:
+; DUMP-NEXT:   %__$rz0 = alloca i8, i32 32, align 8
 ; DUMP-NEXT:   %local1 = alloca i8, i32 64, align 8
 ; DUMP-NEXT:   %local2 = alloca i8, i32 64, align 8
-; DUMP-NEXT:   %__$rz2 = alloca i8, i32 32, align 8
-; DUMP-NEXT:   call void @__asan_poison(i32 %__$rz2, i32 32)
-; DUMP-NEXT:   %__$rz0 = add i32 %local1, 4
-; DUMP-NEXT:   call void @__asan_poison(i32 %__$rz0, i32 60)
-; DUMP-NEXT:   %__$rz1 = add i32 %local2, 4
-; DUMP-NEXT:   call void @__asan_poison(i32 %__$rz1, i32 60)
+; DUMP-NEXT:   %shadowIndex = lshr i32 %__$rz0, 3
+; DUMP-NEXT:   %firstShadowLoc = add i32 %shadowIndex, 53687091
+; DUMP-NEXT:   %__7 = add i32 %firstShadowLoc, 0
+; DUMP-NEXT:   store i32 -1, i32* %__7, align 1
+; DUMP-NEXT:   %__8 = add i32 %firstShadowLoc, 4
+; DUMP-NEXT:   store i32 -252, i32* %__8, align 1
+; DUMP-NEXT:   %__9 = add i32 %firstShadowLoc, 8
+; DUMP-NEXT:   store i32 -1, i32* %__9, align 1
+; DUMP-NEXT:   %__10 = add i32 %firstShadowLoc, 12
+; DUMP-NEXT:   store i32 -252, i32* %__10, align 1
+; DUMP-NEXT:   %__11 = add i32 %firstShadowLoc, 16
+; DUMP-NEXT:   store i32 -1, i32* %__11, align 1
 ; DUMP-NEXT:   %cond = icmp ne i32 %condarg, 0
 ; DUMP-NEXT:   br i1 %cond, label %yes, label %no
 ; DUMP-NEXT: yes:
-; DUMP-NEXT:   call void @__asan_unpoison(i32 %__$rz0, i32 60)
-; DUMP-NEXT:   call void @__asan_unpoison(i32 %__$rz1, i32 60)
-; DUMP-NEXT:   call void @__asan_unpoison(i32 %__$rz2, i32 32)
+; DUMP-NEXT:   store i32 0, i32* %__7, align 1
+; DUMP-NEXT:   store i32 0, i32* %__8, align 1
+; DUMP-NEXT:   store i32 0, i32* %__9, align 1
+; DUMP-NEXT:   store i32 0, i32* %__10, align 1
+; DUMP-NEXT:   store i32 0, i32* %__11, align 1
 ; DUMP-NEXT:   ret void
 ; DUMP-NEXT: no:
-; DUMP-NEXT:   call void @__asan_unpoison(i32 %__$rz0, i32 60)
-; DUMP-NEXT:   call void @__asan_unpoison(i32 %__$rz1, i32 60)
-; DUMP-NEXT:   call void @__asan_unpoison(i32 %__$rz2, i32 32)
+; DUMP-NEXT:   store i32 0, i32* %__7, align 1
+; DUMP-NEXT:   store i32 0, i32* %__8, align 1
+; DUMP-NEXT:   store i32 0, i32* %__9, align 1
+; DUMP-NEXT:   store i32 0, i32* %__10, align 1
+; DUMP-NEXT:   store i32 0, i32* %__11, align 1
 ; DUMP-NEXT:   ret void
-; DUMP-NEXT: }
+; DUMP-NEXT: }