1; RUN: opt < %s -passes=dfsan -dfsan-combine-pointer-labels-on-load=false -dfsan-combine-offset-labels-on-gep=false -dfsan-combine-taint-lookup-table=lookup_table_a -S | FileCheck %s --check-prefixes=CHECK,LOOKUP_A 2; RUN: opt < %s -passes=dfsan -dfsan-combine-pointer-labels-on-load=false -dfsan-combine-offset-labels-on-gep=false -S | FileCheck %s --check-prefixes=CHECK,NO_LOOKUP_A 3target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128" 4target triple = "x86_64-unknown-linux-gnu" 5 6; CHECK: @__dfsan_arg_tls = external thread_local(initialexec) global [[TLS_ARR:\[100 x i64\]]] 7; CHECK: @__dfsan_retval_tls = external thread_local(initialexec) global [[TLS_ARR]] 8@lookup_table_a = external local_unnamed_addr constant [256 x i8], align 16 9@lookup_table_b = external local_unnamed_addr constant [256 x i8], align 16 10 11define i8 @load_lookup_table_a(i8 %p) { 12 ; CHECK-LABEL: @load_lookup_table_a.dfsan 13 ; CHECK-NEXT: %[[#PS:]] = load i8, ptr @__dfsan_arg_tls, align [[ALIGN:2]] 14 ; CHECK-NEXT: %c = zext i8 %p to i64 15 ; CHECK-NEXT: %b = getelementptr inbounds [256 x i8], ptr @lookup_table_a, i64 0, i64 %c 16 ; CHECK-NEXT: %a = load i8, ptr %b, align 1 17 ; Propagates p shadow when lookup_table_a flag is provided, otherwise propagates 0 shadow 18 ; LOOKUP_A-NEXT: store i8 %[[#PS]], ptr @__dfsan_retval_tls, align [[ALIGN]] 19 ; NO_LOOKUP_A-NEXT: store i8 0, ptr @__dfsan_retval_tls, align [[ALIGN]] 20 ; CHECK-NEXT: ret i8 %a 21 22 %c = zext i8 %p to i64 23 %b = getelementptr inbounds [256 x i8], ptr @lookup_table_a, i64 0, i64 %c 24 %a = load i8, ptr %b 25 ret i8 %a 26} 27 28define i8 @load_lookup_table_b(i8 %p) { 29 ; CHECK-LABEL: @load_lookup_table_b.dfsan 30 ; CHECK-NEXT: %[[#PS:]] = load i8, ptr @__dfsan_arg_tls, align 2 31 ; CHECK-NEXT: %c = zext i8 %p to i64 32 ; CHECK-NEXT: %b = getelementptr inbounds [256 x i8], ptr @lookup_table_b, i64 0, i64 %c 33 ; CHECK-NEXT: %a = load i8, ptr %b, align 1 34 ; Propagates 0 shadow 35 ; CHECK-NEXT: store i8 0, ptr @__dfsan_retval_tls, align [[ALIGN]] 36 ; CHECK-NEXT: ret i8 %a 37 38 %c = zext i8 %p to i64 39 %b = getelementptr inbounds [256 x i8], ptr @lookup_table_b, i64 0, i64 %c 40 %a = load i8, ptr %b, align 1 41 ret i8 %a 42} 43