52 lines · plain
1; RUN: opt < %s -S -passes=msan -msan-kernel=1 2>&1 | FileCheck %s2 3target datalayout = "e-m:e-i64:64-i128:128-n32:64-S128"4target triple = "aarch64-unknown-linux-gnu"5 6%struct.__va_list = type { ptr, ptr, ptr, i32, i32 }7 8define i32 @foo(i32 %guard, ...) {9 %vl = alloca %struct.__va_list, align 810 call void @llvm.lifetime.start.p0(ptr %vl)11 call void @llvm.va_start(ptr %vl)12 call void @llvm.va_end(ptr %vl)13 call void @llvm.lifetime.end.p0(ptr %vl)14 ret i32 015}16 17; First check if the variadic shadow values are saved in stack with correct18; size (192 is total of general purpose registers size, 64, plus total of19; floating-point registers size, 128).20 21; CHECK-LABEL: @foo22; CHECK: [[A:%.*]] = load {{.*}} ptr %va_arg_overflow_size23; CHECK: [[B:%.*]] = add i64 192, [[A]]24; CHECK: alloca {{.*}} [[B]]25 26; We expect three memcpy operations: one for the general purpose registers,27; one for floating-point/SIMD ones, and one for thre remaining arguments.28 29; Propagate the GR shadow values on for the va_list::__gp_top, adjust the 30; offset in the __msan_va_arg_tls based on va_list:__gp_off, and finally31; issue the memcpy.32; CHECK: [[GRP:%.*]] = getelementptr inbounds i8, ptr {{%.*}}, i64 {{%.*}}33; CHECK: [[GRSIZE:%.*]] = sub i64 64, {{%.*}}34; CHECK: call void @llvm.memcpy.p0.p0.i64(ptr align 8 {{%.*}}, ptr align 8 [[GRP]], i64 [[GRSIZE]], i1 false)35 36; Propagate the VR shadow values on for the va_list::__vr_top, adjust the 37; offset in the __msan_va_arg_tls based on va_list:__vr_off, and finally38; issue the memcpy.39; CHECK: [[VRP:%.*]] = getelementptr inbounds i8, ptr {{%.*}}, i64 {{%.*}}40; CHECK: [[VRSIZE:%.*]] = sub i64 128, {{%.*}}41; CHECK: call void @llvm.memcpy.p0.p0.i64(ptr align 8 {{%.*}}, ptr align 8 [[VRP]], i64 [[VRSIZE]], i1 false)42 43; Copy the remaining shadow values on the va_list::__stack position (it is44; on the constant offset of 192 from __msan_va_arg_tls).45; CHECK: [[STACK:%.*]] = getelementptr inbounds i8, ptr {{%.*}}, i32 19246; CHECK: call void @llvm.memcpy.p0.p0.i64(ptr align 16 {{%.*}}, ptr align 16 [[STACK]], i64 {{%.*}}, i1 false)47 48declare void @llvm.lifetime.start.p0(ptr nocapture) #149declare void @llvm.va_start(ptr) #250declare void @llvm.va_end(ptr) #251declare void @llvm.lifetime.end.p0(ptr nocapture) #152