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; Test hanlding of llvm.lifetime intrinsics.
; RUN: opt < %s -asan -asan-module -asan-check-lifetime -asan-use-after-return=0 -S | FileCheck %s
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"
declare void @llvm.lifetime.start(i64, i8* nocapture) nounwind
declare void @llvm.lifetime.end(i64, i8* nocapture) nounwind
define void @lifetime_no_size() sanitize_address {
entry:
%i = alloca i32, align 4
%i.ptr = bitcast i32* %i to i8*
call void @llvm.lifetime.start(i64 -1, i8* %i.ptr)
store volatile i8 0, i8* %i.ptr
call void @llvm.lifetime.end(i64 -1, i8* %i.ptr)
; Check that lifetime with no size are ignored.
; CHECK-LABEL: define void @lifetime_no_size()
; CHECK-NOT: @__asan_poison_stack_memory
; CHECK-NOT: @__asan_unpoison_stack_memory
; CHECK: ret void
ret void
}
; Generic case of lifetime analysis.
define void @lifetime() sanitize_address {
; CHECK-LABEL: define void @lifetime()
; Regular variable lifetime intrinsics.
%i = alloca i32, align 4
%i.ptr = bitcast i32* %i to i8*
call void @llvm.lifetime.start(i64 3, i8* %i.ptr)
store volatile i8 0, i8* %i.ptr
; Memory is unpoisoned at llvm.lifetime.start
; CHECK: %[[VAR:[^ ]*]] = ptrtoint i32* %{{[^ ]+}} to i64
; CHECK-NEXT: call void @__asan_unpoison_stack_memory(i64 %[[VAR]], i64 3)
call void @llvm.lifetime.end(i64 4, i8* %i.ptr)
call void @llvm.lifetime.end(i64 2, i8* %i.ptr)
; Memory is poisoned at every call to llvm.lifetime.end
; CHECK: call void @__asan_poison_stack_memory(i64 %{{[^ ]+}}, i64 4)
; CHECK: call void @__asan_poison_stack_memory(i64 %{{[^ ]+}}, i64 2)
; Lifetime intrinsics for array.
%arr = alloca [10 x i32], align 16
%arr.ptr = bitcast [10 x i32]* %arr to i8*
call void @llvm.lifetime.start(i64 40, i8* %arr.ptr)
store volatile i8 0, i8* %arr.ptr
; CHECK: call void @__asan_unpoison_stack_memory(i64 %{{[^ ]+}}, i64 40)
call void @llvm.lifetime.end(i64 40, i8* %arr.ptr)
; CHECK: call void @__asan_poison_stack_memory(i64 %{{[^ ]+}}, i64 40)
; One more lifetime start/end for the same variable %i.
call void @llvm.lifetime.start(i64 4, i8* %i.ptr)
store volatile i8 0, i8* %i.ptr
; CHECK: call void @__asan_unpoison_stack_memory(i64 %{{[^ ]+}}, i64 4)
call void @llvm.lifetime.end(i64 4, i8* %i.ptr)
; CHECK: call void @__asan_poison_stack_memory(i64 %{{[^ ]+}}, i64 4)
; Memory is unpoisoned at function exit (only once).
; CHECK: call void @__asan_unpoison_stack_memory(i64 %{{[^ ]+}}, i64 {{.*}})
; CHECK-NOT: @__asan_unpoison_stack_memory
; CHECK: ret void
ret void
}
; Check that arguments of lifetime may come from phi nodes.
define void @phi_args(i1 %x) sanitize_address {
; CHECK-LABEL: define void @phi_args(i1 %x)
entry:
%i = alloca i64, align 4
%i.ptr = bitcast i64* %i to i8*
call void @llvm.lifetime.start(i64 8, i8* %i.ptr)
store volatile i8 0, i8* %i.ptr
; CHECK: __asan_unpoison_stack_memory
br i1 %x, label %bb0, label %bb1
bb0:
%i.ptr2 = bitcast i64* %i to i8*
br label %bb1
bb1:
%i.phi = phi i8* [ %i.ptr, %entry ], [ %i.ptr2, %bb0 ]
call void @llvm.lifetime.end(i64 8, i8* %i.phi)
; CHECK: __asan_poison_stack_memory
; CHECK: ret void
ret void
}
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