4db69f4145
LLVM allows Windows Control Flow Guard to be enabled in "table only" mode where it emits the Control Flow Guard tables (indicating addresses for valid targets) but doesn't emit any checks at call sites. This is almost the same as MSVC's `/d2guardnochecks` flag, EXCEPT MSVC doesn't set the COFF feature bit indicating that Control Flow Guard is enabled (`GuardCF`) whereas LLVM does. This change aligns LLVM with MSVC: in table only mode, the Control Flow Guard COFF feature bit (`GuardCF`) will not be set.
167 lines
8.7 KiB
LLVM
167 lines
8.7 KiB
LLVM
; RUN: llc < %s -mtriple=x86_64-pc-windows-msvc | FileCheck %s
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; Control Flow Guard is currently only available on Windows
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; If no checks were inserted then the GuardCF bit shouldn't be set in @feat.00.
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; CHECK: @feat.00 = 0
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; CHECK: .section .gfids$y
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; CHECK: .symidx "?address_taken@@YAXXZ"
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; CHECK: .symidx "?virt_method@Derived@@UEBAHXZ"
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; ModuleID = 'cfguard.cpp'
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source_filename = "cfguard.cpp"
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target datalayout = "e-m:w-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-pc-windows-msvc"
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%struct.Derived = type { %struct.Base }
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%struct.Base = type { ptr }
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%rtti.CompleteObjectLocator = type { i32, i32, i32, i32, i32, i32 }
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%rtti.TypeDescriptor13 = type { ptr, ptr, [14 x i8] }
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%rtti.ClassHierarchyDescriptor = type { i32, i32, i32, i32 }
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%rtti.BaseClassDescriptor = type { i32, i32, i32, i32, i32, i32, i32 }
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%rtti.TypeDescriptor10 = type { ptr, ptr, [11 x i8] }
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$"\01??0Derived@@QEAA@XZ" = comdat any
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$"\01??0Base@@QEAA@XZ" = comdat any
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$"\01?virt_method@Derived@@UEBAHXZ" = comdat any
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$"\01??_7Derived@@6B@" = comdat largest
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$"\01??_R4Derived@@6B@" = comdat any
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$"\01??_R0?AUDerived@@@8" = comdat any
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$"\01??_R3Derived@@8" = comdat any
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$"\01??_R2Derived@@8" = comdat any
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$"\01??_R1A@?0A@EA@Derived@@8" = comdat any
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$"\01??_R1A@?0A@EA@Base@@8" = comdat any
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$"\01??_R0?AUBase@@@8" = comdat any
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$"\01??_R3Base@@8" = comdat any
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$"\01??_R2Base@@8" = comdat any
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$"\01??_7Base@@6B@" = comdat largest
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$"\01??_R4Base@@6B@" = comdat any
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@"\01?D@@3UDerived@@A" = global %struct.Derived zeroinitializer, align 8
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@0 = private unnamed_addr constant { [2 x ptr] } { [2 x ptr] [ptr @"\01??_R4Derived@@6B@", ptr @"\01?virt_method@Derived@@UEBAHXZ"] }, comdat($"\01??_7Derived@@6B@")
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@"\01??_R4Derived@@6B@" = linkonce_odr constant %rtti.CompleteObjectLocator { i32 1, i32 0, i32 0, i32 trunc (i64 sub nuw nsw (i64 ptrtoint (ptr @"\01??_R0?AUDerived@@@8" to i64), i64 ptrtoint (ptr @__ImageBase to i64)) to i32), i32 trunc (i64 sub nuw nsw (i64 ptrtoint (ptr @"\01??_R3Derived@@8" to i64), i64 ptrtoint (ptr @__ImageBase to i64)) to i32), i32 trunc (i64 sub nuw nsw (i64 ptrtoint (ptr @"\01??_R4Derived@@6B@" to i64), i64 ptrtoint (ptr @__ImageBase to i64)) to i32) }, comdat
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@"\01??_7type_info@@6B@" = external constant ptr
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@"\01??_R0?AUDerived@@@8" = linkonce_odr global %rtti.TypeDescriptor13 { ptr @"\01??_7type_info@@6B@", ptr null, [14 x i8] c".?AUDerived@@\00" }, comdat
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@__ImageBase = external constant i8
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@"\01??_R3Derived@@8" = linkonce_odr constant %rtti.ClassHierarchyDescriptor { i32 0, i32 0, i32 2, i32 trunc (i64 sub nuw nsw (i64 ptrtoint (ptr @"\01??_R2Derived@@8" to i64), i64 ptrtoint (ptr @__ImageBase to i64)) to i32) }, comdat
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@"\01??_R2Derived@@8" = linkonce_odr constant [3 x i32] [i32 trunc (i64 sub nuw nsw (i64 ptrtoint (ptr @"\01??_R1A@?0A@EA@Derived@@8" to i64), i64 ptrtoint (ptr @__ImageBase to i64)) to i32), i32 trunc (i64 sub nuw nsw (i64 ptrtoint (ptr @"\01??_R1A@?0A@EA@Base@@8" to i64), i64 ptrtoint (ptr @__ImageBase to i64)) to i32), i32 0], comdat
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@"\01??_R1A@?0A@EA@Derived@@8" = linkonce_odr constant %rtti.BaseClassDescriptor { i32 trunc (i64 sub nuw nsw (i64 ptrtoint (ptr @"\01??_R0?AUDerived@@@8" to i64), i64 ptrtoint (ptr @__ImageBase to i64)) to i32), i32 1, i32 0, i32 -1, i32 0, i32 64, i32 trunc (i64 sub nuw nsw (i64 ptrtoint (ptr @"\01??_R3Derived@@8" to i64), i64 ptrtoint (ptr @__ImageBase to i64)) to i32) }, comdat
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@"\01??_R1A@?0A@EA@Base@@8" = linkonce_odr constant %rtti.BaseClassDescriptor { i32 trunc (i64 sub nuw nsw (i64 ptrtoint (ptr @"\01??_R0?AUBase@@@8" to i64), i64 ptrtoint (ptr @__ImageBase to i64)) to i32), i32 0, i32 0, i32 -1, i32 0, i32 64, i32 trunc (i64 sub nuw nsw (i64 ptrtoint (ptr @"\01??_R3Base@@8" to i64), i64 ptrtoint (ptr @__ImageBase to i64)) to i32) }, comdat
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@"\01??_R0?AUBase@@@8" = linkonce_odr global %rtti.TypeDescriptor10 { ptr @"\01??_7type_info@@6B@", ptr null, [11 x i8] c".?AUBase@@\00" }, comdat
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@"\01??_R3Base@@8" = linkonce_odr constant %rtti.ClassHierarchyDescriptor { i32 0, i32 0, i32 1, i32 trunc (i64 sub nuw nsw (i64 ptrtoint (ptr @"\01??_R2Base@@8" to i64), i64 ptrtoint (ptr @__ImageBase to i64)) to i32) }, comdat
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@"\01??_R2Base@@8" = linkonce_odr constant [2 x i32] [i32 trunc (i64 sub nuw nsw (i64 ptrtoint (ptr @"\01??_R1A@?0A@EA@Base@@8" to i64), i64 ptrtoint (ptr @__ImageBase to i64)) to i32), i32 0], comdat
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@1 = private unnamed_addr constant { [2 x ptr] } { [2 x ptr] [ptr @"\01??_R4Base@@6B@", ptr @_purecall] }, comdat($"\01??_7Base@@6B@")
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@"\01??_R4Base@@6B@" = linkonce_odr constant %rtti.CompleteObjectLocator { i32 1, i32 0, i32 0, i32 trunc (i64 sub nuw nsw (i64 ptrtoint (ptr @"\01??_R0?AUBase@@@8" to i64), i64 ptrtoint (ptr @__ImageBase to i64)) to i32), i32 trunc (i64 sub nuw nsw (i64 ptrtoint (ptr @"\01??_R3Base@@8" to i64), i64 ptrtoint (ptr @__ImageBase to i64)) to i32), i32 trunc (i64 sub nuw nsw (i64 ptrtoint (ptr @"\01??_R4Base@@6B@" to i64), i64 ptrtoint (ptr @__ImageBase to i64)) to i32) }, comdat
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@llvm.global_ctors = appending global [1 x { i32, ptr, ptr }] [{ i32, ptr, ptr } { i32 65535, ptr @_GLOBAL__sub_I_cfguard.cpp, ptr null }]
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@"\01??_7Derived@@6B@" = unnamed_addr alias ptr, getelementptr inbounds ({ [2 x ptr] }, ptr @0, i32 0, i32 0, i32 1)
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@"\01??_7Base@@6B@" = unnamed_addr alias ptr, getelementptr inbounds ({ [2 x ptr] }, ptr @1, i32 0, i32 0, i32 1)
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; Function Attrs: noinline nounwind
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define internal void @"\01??__ED@@YAXXZ"() #0 {
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entry:
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%call = call ptr @"\01??0Derived@@QEAA@XZ"(ptr @"\01?D@@3UDerived@@A") #2
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ret void
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}
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; Function Attrs: noinline nounwind optnone
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define linkonce_odr ptr @"\01??0Derived@@QEAA@XZ"(ptr returned %this) unnamed_addr #1 comdat align 2 {
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entry:
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%this.addr = alloca ptr, align 8
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store ptr %this, ptr %this.addr, align 8
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%this1 = load ptr, ptr %this.addr, align 8
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%0 = bitcast ptr %this1 to ptr
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%call = call ptr @"\01??0Base@@QEAA@XZ"(ptr %0) #2
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%1 = bitcast ptr %this1 to ptr
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store ptr @"\01??_7Derived@@6B@", ptr %1, align 8
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ret ptr %this1
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}
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; Function Attrs: noinline nounwind optnone
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define void @"\01?address_taken@@YAXXZ"() #1 {
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entry:
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ret void
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}
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; Function Attrs: noinline nounwind optnone
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define ptr @"\01?foo@@YAP6AXXZPEAUBase@@@Z"(ptr %B) #1 {
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entry:
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%retval = alloca ptr, align 8
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%B.addr = alloca ptr, align 8
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store ptr %B, ptr %B.addr, align 8
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%0 = load ptr, ptr %B.addr, align 8
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%1 = bitcast ptr %0 to ptr
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%vtable = load ptr, ptr %1, align 8
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%vfn = getelementptr inbounds ptr, ptr %vtable, i64 0
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%2 = load ptr, ptr %vfn, align 8
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%call = call i32 %2(ptr %0)
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%tobool = icmp ne i32 %call, 0
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br i1 %tobool, label %if.then, label %if.end
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if.then: ; preds = %entry
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store ptr @"\01?address_taken@@YAXXZ", ptr %retval, align 8
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br label %return
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if.end: ; preds = %entry
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store ptr null, ptr %retval, align 8
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br label %return
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return: ; preds = %if.end, %if.then
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%3 = load ptr, ptr %retval, align 8
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ret ptr %3
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}
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; Function Attrs: noinline nounwind optnone
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define linkonce_odr ptr @"\01??0Base@@QEAA@XZ"(ptr returned %this) unnamed_addr #1 comdat align 2 {
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entry:
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%this.addr = alloca ptr, align 8
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store ptr %this, ptr %this.addr, align 8
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%this1 = load ptr, ptr %this.addr, align 8
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%0 = bitcast ptr %this1 to ptr
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store ptr @"\01??_7Base@@6B@", ptr %0, align 8
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ret ptr %this1
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}
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; Function Attrs: noinline nounwind optnone
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define linkonce_odr i32 @"\01?virt_method@Derived@@UEBAHXZ"(ptr %this) unnamed_addr #1 comdat align 2 {
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entry:
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%this.addr = alloca ptr, align 8
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store ptr %this, ptr %this.addr, align 8
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%this1 = load ptr, ptr %this.addr, align 8
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ret i32 42
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}
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declare dllimport void @_purecall() unnamed_addr
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; Function Attrs: noinline nounwind
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define internal void @_GLOBAL__sub_I_cfguard.cpp() #0 {
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entry:
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call void @"\01??__ED@@YAXXZ"()
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ret void
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}
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attributes #0 = { noinline nounwind "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "frame-pointer"="none" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "target-features"="+mmx,+sse,+sse2,+x87" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #1 = { noinline nounwind optnone "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "frame-pointer"="none" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "target-features"="+mmx,+sse,+sse2,+x87" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #2 = { nounwind }
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!llvm.module.flags = !{!0, !1}
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!llvm.ident = !{!2}
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!0 = !{i32 2, !"cfguard", i32 1}
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!1 = !{i32 1, !"wchar_size", i32 2}
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!2 = !{!"clang version 6.0.0 "}
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