45 lines
2.1 KiB
LLVM
45 lines
2.1 KiB
LLVM
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; 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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declare dllimport i32 @target_func1()
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declare dllimport i32 @target_func2()
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declare dllimport i32 @target_func3()
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@ptrs = dso_local local_unnamed_addr global [2 x void ()*] [void ()* bitcast (i32 ()* @target_func2 to void ()*), void ()* bitcast (i32 ()* @target_func3 to void ()*)], align 16
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; Test address-taken functions from imported DLLs are correctly added to the
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; Guard Address-Taken IAT Entry (.giats) and Guard Function ID (.gfids) sections.
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define i32 @func_cf_giats1() {
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entry:
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; Since it is a dllimport, target_func1 will be represented as "__imp_target_func1" when it is
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; stored in the function pointer. Therefore, the .giats section must contain "__imp_target_func1".
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; Unlike MSVC, we also have "target_func1" in the .gfids section, since this is not a security risk.
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%func_ptr = alloca i32 ()*, align 8
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store i32 ()* @target_func1, i32 ()** %func_ptr, align 8
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%0 = load i32 ()*, i32 ()** %func_ptr, align 8
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%1 = call i32 %0()
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; target_func2 is called directly from a global array, so should only appear in the .gfids section.
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%2 = load i32 ()*, i32 ()** bitcast ([2 x void ()*]* @ptrs to i32 ()**), align 8
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%3 = call i32 %2()
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; target_func3 is called both via a stored function pointer (as with target_func1) and via a gloabl
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; array (as with target_func2), so "target_func3" must appear in .gfids and "__imp_target_func3" in .giats.
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store i32 ()* @target_func3, i32 ()** %func_ptr, align 8
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%4 = load i32 ()*, i32 ()** %func_ptr, align 8
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%5 = call i32 %4()
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%6 = load i32 ()*, i32 ()** bitcast (void ()** getelementptr inbounds ([2 x void ()*], [2 x void ()*]* @ptrs, i64 0, i64 1) to i32 ()**), align 8
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%7 = call i32 %6()
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ret i32 %5
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}
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; CHECK-LABEL: .section .gfids$y,"dr"
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; CHECK-NEXT: .symidx target_func1
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; CHECK-NEXT: .symidx target_func2
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; CHECK-NEXT: .symidx target_func3
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; CHECK-NOT: .symidx
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; CHECK-LABEL: .section .giats$y,"dr"
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; CHECK-NEXT: .symidx __imp_target_func1
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; CHECK-NEXT: .symidx __imp_target_func3
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; CHECK-NOT: .symidx
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!llvm.module.flags = !{!0}
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!0 = !{i32 2, !"cfguard", i32 2}
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