1 ; RUN: opt < %s -S -passes=msan 2>&1 | FileCheck %s
3 target datalayout = "e-m:m-i8:8:32-i16:16:32-i64:64-n32:64-S128"
4 target triple = "mips64el--linux"
6 define i32 @foo(i32 %guard, ...) {
7 %vl = alloca ptr, align 8
8 call void @llvm.lifetime.start.p0(i64 32, ptr %vl)
9 call void @llvm.va_start(ptr %vl)
10 call void @llvm.va_end(ptr %vl)
11 call void @llvm.lifetime.end.p0(i64 32, ptr %vl)
15 ; First, check allocation of the save area.
18 ; CHECK: [[A:%.*]] = load {{.*}} @__msan_va_arg_overflow_size_tls
19 ; CHECK: [[C:%.*]] = alloca {{.*}} [[A]]
21 ; CHECK: call void @llvm.memset.p0.i64(ptr align 8 [[C]], i8 0, i64 [[A]], i1 false)
23 ; CHECK: [[D:%.*]] = call i64 @llvm.umin.i64(i64 [[A]], i64 800)
24 ; CHECK: call void @llvm.memcpy.p0.p0.i64(ptr align 8 [[C]], ptr align 8 @__msan_va_arg_tls, i64 [[D]], i1 false)
26 declare void @llvm.lifetime.start.p0(i64, ptr nocapture) #1
27 declare void @llvm.va_start(ptr) #2
28 declare void @llvm.va_end(ptr) #2
29 declare void @llvm.lifetime.end.p0(i64, ptr nocapture) #1
32 %1 = call i32 (i32, ...) @foo(i32 0, i32 1, i64 2, double 3.000000e+00)
36 ; Save the incoming shadow value from the arguments in the __msan_va_arg_tls
39 ; CHECK: store i32 0, ptr @__msan_va_arg_tls, align 8
40 ; CHECK: store i64 0, ptr inttoptr (i64 add (i64 ptrtoint (ptr @__msan_va_arg_tls to i64), i64 8) to ptr), align 8
41 ; CHECK: store i64 0, ptr inttoptr (i64 add (i64 ptrtoint (ptr @__msan_va_arg_tls to i64), i64 16) to ptr), align 8
42 ; CHECK: store {{.*}} 24, {{.*}} @__msan_va_arg_overflow_size_tls
44 ; Check multiple fixed arguments.
45 declare i32 @foo2(i32 %g1, i32 %g2, ...)
47 %1 = call i32 (i32, i32, ...) @foo2(i32 0, i32 1, i64 2, double 3.000000e+00)
52 ; CHECK: store i64 0, ptr @__msan_va_arg_tls, align 8
53 ; CHECK: store i64 0, ptr inttoptr (i64 add (i64 ptrtoint (ptr @__msan_va_arg_tls to i64), i64 8) to ptr), align 8
54 ; CHECK: store {{.*}} 16, {{.*}} @__msan_va_arg_overflow_size_tls
56 ; Test that MSan doesn't generate code overflowing __msan_va_arg_tls when too many arguments are
57 ; passed to a variadic function.
58 define dso_local i64 @many_args() {
60 %ret = call i64 (i64, ...) @sum(i64 120,
61 i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1,
62 i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1,
63 i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1,
64 i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1,
65 i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1,
66 i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1,
67 i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1,
68 i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1,
69 i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1,
70 i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1,
71 i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1,
72 i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1, i64 1
77 ; If the size of __msan_va_arg_tls changes the second argument of `add` must also be changed.
78 ; CHECK-LABEL: @many_args
79 ; CHECK: i64 add (i64 ptrtoint (ptr @__msan_va_arg_tls to i64), i64 792)
80 ; CHECK-NOT: i64 add (i64 ptrtoint (ptr @__msan_va_arg_tls to i64), i64 800)
81 declare i64 @sum(i64 %n, ...)