234 lines
9.5 KiB
LLVM
234 lines
9.5 KiB
LLVM
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; RUN: llc -mtriple=x86_64-pc-linux-gnu -start-before=stack-protector \
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; RUN: -stop-after=stack-protector -o - < %s | FileCheck %s
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; Bugs 42238/43308: Test some additional situations not caught previously.
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define void @store_captures() #0 {
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; CHECK-LABEL: @store_captures(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[STACKGUARDSLOT:%.*]] = alloca ptr
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; CHECK-NEXT: [[STACKGUARD:%.*]] = load volatile ptr, ptr addrspace(257) inttoptr (i32 40 to ptr addrspace(257))
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; CHECK-NEXT: call void @llvm.stackprotector(ptr [[STACKGUARD]], ptr [[STACKGUARDSLOT]])
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; CHECK-NEXT: [[RETVAL:%.*]] = alloca i32, align 4
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; CHECK-NEXT: [[A:%.*]] = alloca i32, align 4
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; CHECK-NEXT: [[J:%.*]] = alloca ptr, align 8
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; CHECK-NEXT: store i32 0, ptr [[RETVAL]]
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; CHECK-NEXT: [[LOAD:%.*]] = load i32, ptr [[A]], align 4
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; CHECK-NEXT: [[ADD:%.*]] = add nsw i32 [[LOAD]], 1
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; CHECK-NEXT: store i32 [[ADD]], ptr [[A]], align 4
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; CHECK-NEXT: store ptr [[A]], ptr [[J]], align 8
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; CHECK-NEXT: [[STACKGUARD1:%.*]] = load volatile ptr, ptr addrspace(257) inttoptr (i32 40 to ptr addrspace(257))
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; CHECK-NEXT: [[TMP0:%.*]] = load volatile ptr, ptr [[STACKGUARDSLOT]]
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; CHECK-NEXT: [[TMP1:%.*]] = icmp eq ptr [[STACKGUARD1]], [[TMP0]]
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; CHECK-NEXT: br i1 [[TMP1]], label [[SP_RETURN:%.*]], label [[CALLSTACKCHECKFAILBLK:%.*]], !prof !0
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; CHECK: SP_return:
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; CHECK-NEXT: ret void
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; CHECK: CallStackCheckFailBlk:
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; CHECK-NEXT: call void @__stack_chk_fail()
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; CHECK-NEXT: unreachable
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;
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entry:
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%retval = alloca i32, align 4
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%a = alloca i32, align 4
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%j = alloca ptr, align 8
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store i32 0, ptr %retval
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%load = load i32, ptr %a, align 4
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%add = add nsw i32 %load, 1
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store i32 %add, ptr %a, align 4
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store ptr %a, ptr %j, align 8
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ret void
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}
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define ptr @non_captures() #0 {
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; load, atomicrmw, and ret do not trigger a stack protector.
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; CHECK-LABEL: @non_captures(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[A:%.*]] = alloca i32, align 4
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; CHECK-NEXT: [[LOAD:%.*]] = load i32, ptr [[A]], align 4
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; CHECK-NEXT: [[ATOM:%.*]] = atomicrmw add ptr [[A]], i32 1 seq_cst
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; CHECK-NEXT: ret ptr [[A]]
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;
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entry:
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%a = alloca i32, align 4
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%load = load i32, ptr %a, align 4
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%atom = atomicrmw add ptr %a, i32 1 seq_cst
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ret ptr %a
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}
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define void @store_addrspacecast_captures() #0 {
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; CHECK-LABEL: @store_addrspacecast_captures(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[STACKGUARDSLOT:%.*]] = alloca ptr
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; CHECK-NEXT: [[STACKGUARD:%.*]] = load volatile ptr, ptr addrspace(257) inttoptr (i32 40 to ptr addrspace(257))
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; CHECK-NEXT: call void @llvm.stackprotector(ptr [[STACKGUARD]], ptr [[STACKGUARDSLOT]])
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; CHECK-NEXT: [[RETVAL:%.*]] = alloca i32, align 4
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; CHECK-NEXT: [[A:%.*]] = alloca i32, align 4
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; CHECK-NEXT: [[J:%.*]] = alloca ptr addrspace(1), align 8
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; CHECK-NEXT: store i32 0, ptr [[RETVAL]]
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; CHECK-NEXT: [[LOAD:%.*]] = load i32, ptr [[A]], align 4
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; CHECK-NEXT: [[ADD:%.*]] = add nsw i32 [[LOAD]], 1
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; CHECK-NEXT: store i32 [[ADD]], ptr [[A]], align 4
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; CHECK-NEXT: [[A_ADDRSPACECAST:%.*]] = addrspacecast ptr [[A]] to ptr addrspace(1)
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; CHECK-NEXT: store ptr addrspace(1) [[A_ADDRSPACECAST]], ptr [[J]], align 8
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; CHECK-NEXT: [[STACKGUARD1:%.*]] = load volatile ptr, ptr addrspace(257) inttoptr (i32 40 to ptr addrspace(257))
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; CHECK-NEXT: [[TMP0:%.*]] = load volatile ptr, ptr [[STACKGUARDSLOT]]
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; CHECK-NEXT: [[TMP1:%.*]] = icmp eq ptr [[STACKGUARD1]], [[TMP0]]
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; CHECK-NEXT: br i1 [[TMP1]], label [[SP_RETURN:%.*]], label [[CALLSTACKCHECKFAILBLK:%.*]], !prof !0
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; CHECK: SP_return:
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; CHECK-NEXT: ret void
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; CHECK: CallStackCheckFailBlk:
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; CHECK-NEXT: call void @__stack_chk_fail()
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; CHECK-NEXT: unreachable
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;
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entry:
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%retval = alloca i32, align 4
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%a = alloca i32, align 4
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%j = alloca ptr addrspace(1), align 8
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store i32 0, ptr %retval
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%load = load i32, ptr %a, align 4
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%add = add nsw i32 %load, 1
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store i32 %add, ptr %a, align 4
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%a.addrspacecast = addrspacecast ptr %a to ptr addrspace(1)
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store ptr addrspace(1) %a.addrspacecast, ptr %j, align 8
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ret void
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}
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define void @cmpxchg_captures() #0 {
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; CHECK-LABEL: @cmpxchg_captures(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[STACKGUARDSLOT:%.*]] = alloca ptr
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; CHECK-NEXT: [[STACKGUARD:%.*]] = load volatile ptr, ptr addrspace(257) inttoptr (i32 40 to ptr addrspace(257))
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; CHECK-NEXT: call void @llvm.stackprotector(ptr [[STACKGUARD]], ptr [[STACKGUARDSLOT]])
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; CHECK-NEXT: [[RETVAL:%.*]] = alloca i32, align 4
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; CHECK-NEXT: [[A:%.*]] = alloca i32, align 4
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; CHECK-NEXT: [[J:%.*]] = alloca ptr, align 8
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; CHECK-NEXT: store i32 0, ptr [[RETVAL]]
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; CHECK-NEXT: [[LOAD:%.*]] = load i32, ptr [[A]], align 4
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; CHECK-NEXT: [[ADD:%.*]] = add nsw i32 [[LOAD]], 1
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; CHECK-NEXT: store i32 [[ADD]], ptr [[A]], align 4
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; CHECK-NEXT: [[TMP0:%.*]] = cmpxchg ptr [[J]], ptr null, ptr [[A]] seq_cst monotonic
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; CHECK-NEXT: [[STACKGUARD1:%.*]] = load volatile ptr, ptr addrspace(257) inttoptr (i32 40 to ptr addrspace(257))
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; CHECK-NEXT: [[TMP1:%.*]] = load volatile ptr, ptr [[STACKGUARDSLOT]]
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; CHECK-NEXT: [[TMP2:%.*]] = icmp eq ptr [[STACKGUARD1]], [[TMP1]]
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; CHECK-NEXT: br i1 [[TMP2]], label [[SP_RETURN:%.*]], label [[CALLSTACKCHECKFAILBLK:%.*]], !prof !0
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; CHECK: SP_return:
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; CHECK-NEXT: ret void
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; CHECK: CallStackCheckFailBlk:
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; CHECK-NEXT: call void @__stack_chk_fail()
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; CHECK-NEXT: unreachable
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;
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entry:
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%retval = alloca i32, align 4
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%a = alloca i32, align 4
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%j = alloca ptr, align 8
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store i32 0, ptr %retval
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%load = load i32, ptr %a, align 4
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%add = add nsw i32 %load, 1
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store i32 %add, ptr %a, align 4
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cmpxchg ptr %j, ptr null, ptr %a seq_cst monotonic
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ret void
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}
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define void @memset_captures(i64 %c) #0 {
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; CHECK-LABEL: @memset_captures(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[STACKGUARDSLOT:%.*]] = alloca ptr
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; CHECK-NEXT: [[STACKGUARD:%.*]] = load volatile ptr, ptr addrspace(257) inttoptr (i32 40 to ptr addrspace(257))
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; CHECK-NEXT: call void @llvm.stackprotector(ptr [[STACKGUARD]], ptr [[STACKGUARDSLOT]])
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; CHECK-NEXT: [[CADDR:%.*]] = alloca i64, align 8
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; CHECK-NEXT: store i64 %c, ptr [[CADDR]], align 8
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; CHECK-NEXT: [[I:%.*]] = alloca i32, align 4
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; CHECK-NEXT: [[COUNT:%.*]] = load i64, ptr [[CADDR]], align 8
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; CHECK-NEXT: call void @llvm.memset.p0.i64(ptr align 4 [[I]], i8 0, i64 [[COUNT]], i1 false)
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; CHECK-NEXT: [[STACKGUARD1:%.*]] = load volatile ptr, ptr addrspace(257) inttoptr (i32 40 to ptr addrspace(257))
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; CHECK-NEXT: [[TMP1:%.*]] = load volatile ptr, ptr [[STACKGUARDSLOT]]
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; CHECK-NEXT: [[TMP2:%.*]] = icmp eq ptr [[STACKGUARD1]], [[TMP1]]
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; CHECK-NEXT: br i1 [[TMP2]], label [[SP_RETURN:%.*]], label [[CALLSTACKCHECKFAILBLK:%.*]], !prof !0
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; CHECK: SP_return:
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; CHECK-NEXT: ret void
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; CHECK: CallStackCheckFailBlk:
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; CHECK-NEXT: call void @__stack_chk_fail()
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; CHECK-NEXT: unreachable
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;
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entry:
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%c.addr = alloca i64, align 8
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store i64 %c, ptr %c.addr, align 8
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%i = alloca i32, align 4
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%count = load i64, ptr %c.addr, align 8
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call void @llvm.memset.p0.i64(ptr align 4 %i, i8 0, i64 %count, i1 false)
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ret void
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}
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declare void @llvm.memset.p0.i64(ptr nocapture writeonly, i8, i64, i1 immarg)
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; Intentionally does not have any fn attrs.
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declare dso_local void @foo(ptr)
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; @bar_sspstrong and @bar_nossp are the same function, but differ only in
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; function attributes. Test that a callee without stack protector function
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; attribute does not trigger a stack guard slot in a caller that also does not
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; have a stack protector slot.
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define dso_local void @bar_sspstrong(i64 %0) #0 {
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; CHECK-LABEL: @bar_sspstrong
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; CHECK-NEXT: %StackGuardSlot = alloca ptr
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%2 = alloca i64, align 8
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store i64 %0, ptr %2, align 8
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%3 = load i64, ptr %2, align 8
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%4 = alloca i8, i64 %3, align 16
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call void @foo(ptr %4)
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ret void
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}
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; Intentionally does not have any fn attrs.
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define dso_local void @bar_nossp(i64 %0) {
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; CHECK-LABEL: @bar_nossp
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; CHECK-NEXT: %2 = alloca i64
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%2 = alloca i64, align 8
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store i64 %0, ptr %2, align 8
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%3 = load i64, ptr %2, align 8
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%4 = alloca i8, i64 %3, align 16
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call void @foo(ptr %4)
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ret void
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}
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; Check stack protect for noreturn call
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define dso_local i32 @foo_no_return(i32 %0) #1 {
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; CHECK-LABEL: @foo_no_return
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entry:
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%cmp = icmp sgt i32 %0, 4
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br i1 %cmp, label %if.then, label %if.end
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; CHECK: if.then: ; preds = %entry
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; CHECK-NEXT: %StackGuard1 = load volatile ptr, ptr addrspace(257) inttoptr (i32 40 to ptr addrspace(257)), align 8
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; CHECK-NEXT: %1 = load volatile ptr, ptr %StackGuardSlot, align 8
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; CHECK-NEXT: %2 = icmp eq ptr %StackGuard1, %1
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; CHECK-NEXT: br i1 %2, label %SP_return, label %CallStackCheckFailBlk
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; CHECK: SP_return: ; preds = %if.then
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; CHECK-NEXT: %call = call i32 @foo_no_return(i32 1)
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; CHECK-NEXT: br label %return
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; CHECK: if.end: ; preds = %entry
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; CHECK-NEXT: br label %return
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if.then: ; preds = %entry
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%call = call i32 @foo_no_return(i32 1)
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br label %return
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if.end: ; preds = %entry
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br label %return
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return: ; preds = %if.end, %if.then
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ret i32 0
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}
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declare void @callee() noreturn nounwind
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define void @caller() sspstrong {
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; Test that a stack protector is NOT inserted when we call nounwind functions.
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; CHECK-LABEL: @caller
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; CHECK-NEXT: call void @callee
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call void @callee() noreturn nounwind
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ret void
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}
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attributes #0 = { sspstrong }
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attributes #1 = { noreturn sspreq}
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