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af44b5b1af
Use a combination of !associated, comdat, @llvm.compiler.used and custom sections to allow dead stripping of globals and their asan metadata. Sometimes. Currently this works on LLD, which supports SHF_LINK_ORDER with sh_link pointing to the associated section. This also works on BFD, which seems to treat comdats as all-or-nothing with respect to linker GC. There is a weird quirk where the "first" global in each link is never GC-ed because of the section symbols. At this moment it does not work on Gold (as in the globals are never stripped). This is a second re-land of r298158. This time, this feature is limited to -fdata-sections builds. llvm-svn: 301587
42 lines
1.7 KiB
LLVM
42 lines
1.7 KiB
LLVM
; Test that global metadata is placed in a separate section on Mach-O platforms,
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; allowing dead stripping to be performed, and that the appropriate runtime
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; routines are invoked.
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; RUN: opt < %s -asan -asan-module -asan-globals-live-support=1 -S | FileCheck %s
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target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-apple-macosx10.11.0"
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@global = global [1 x i32] zeroinitializer, align 4
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!llvm.asan.globals = !{!0}
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!0 = !{[1 x i32]* @global, !1, !"global", i1 false, i1 false}
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!1 = !{!"test-globals.c", i32 1, i32 5}
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; Find the metadata for @global:
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; CHECK: [[METADATA:@.+]] = internal global {{.*}} @global {{.*}} section "__DATA,__asan_globals,regular"
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; Find the liveness binder for @global and its metadata:
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; CHECK: @__asan_binder_global = internal global {{.*}} @global {{.*}} [[METADATA]] {{.*}} section "__DATA,__asan_liveness,regular,live_support"
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; The binder has to be inserted to llvm.compiler.used to avoid being stripped
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; during LTO.
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; CHECK: @llvm.compiler.used {{.*}} @__asan_binder_global {{.*}} section "llvm.metadata"
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; Test that there is the flag global variable:
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; CHECK: @___asan_globals_registered = common hidden global i64 0
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; Test that __asan_register_image_globals is invoked from the constructor:
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; CHECK-LABEL: define internal void @asan.module_ctor
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; CHECK-NOT: ret
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; CHECK: call void @__asan_register_image_globals(i64 ptrtoint (i64* @___asan_globals_registered to i64))
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; CHECK: ret
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; Test that __asan_unregister_image_globals is invoked from the destructor:
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; CHECK-LABEL: define internal void @asan.module_dtor
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; CHECK-NOT: ret
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; CHECK: call void @__asan_unregister_image_globals(i64 ptrtoint (i64* @___asan_globals_registered to i64))
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; CHECK: ret
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