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; 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
; 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
target 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"
target triple = "x86_64-unknown-linux-gnu"
; CHECK: @__dfsan_arg_tls = external thread_local(initialexec) global [[TLS_ARR:\[100 x i64\]]]
; CHECK: @__dfsan_retval_tls = external thread_local(initialexec) global [[TLS_ARR]]
@lookup_table_a = external local_unnamed_addr constant [256 x i8], align 16
@lookup_table_b = external local_unnamed_addr constant [256 x i8], align 16
define i8 @load_lookup_table_a(i8 %p) {
; CHECK-LABEL: @load_lookup_table_a.dfsan
; CHECK-NEXT: %[[#PS:]] = load i8, ptr @__dfsan_arg_tls, align [[ALIGN:2]]
; CHECK-NEXT: %c = zext i8 %p to i64
; CHECK-NEXT: %b = getelementptr inbounds [256 x i8], ptr @lookup_table_a, i64 0, i64 %c
; CHECK-NEXT: %a = load i8, ptr %b, align 1
; Propagates p shadow when lookup_table_a flag is provided, otherwise propagates 0 shadow
; LOOKUP_A-NEXT: store i8 %[[#PS]], ptr @__dfsan_retval_tls, align [[ALIGN]]
; NO_LOOKUP_A-NEXT: store i8 0, ptr @__dfsan_retval_tls, align [[ALIGN]]
; CHECK-NEXT: ret i8 %a
%c = zext i8 %p to i64
%b = getelementptr inbounds [256 x i8], ptr @lookup_table_a, i64 0, i64 %c
%a = load i8, ptr %b
ret i8 %a
}
define i8 @load_lookup_table_b(i8 %p) {
; CHECK-LABEL: @load_lookup_table_b.dfsan
; CHECK-NEXT: %[[#PS:]] = load i8, ptr @__dfsan_arg_tls, align 2
; CHECK-NEXT: %c = zext i8 %p to i64
; CHECK-NEXT: %b = getelementptr inbounds [256 x i8], ptr @lookup_table_b, i64 0, i64 %c
; CHECK-NEXT: %a = load i8, ptr %b, align 1
; Propagates 0 shadow
; CHECK-NEXT: store i8 0, ptr @__dfsan_retval_tls, align [[ALIGN]]
; CHECK-NEXT: ret i8 %a
%c = zext i8 %p to i64
%b = getelementptr inbounds [256 x i8], ptr @lookup_table_b, i64 0, i64 %c
%a = load i8, ptr %b, align 1
ret i8 %a
}
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