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The 3-field form was introduced by D3499 in 2014 and the legacy 2-field form was planned to be removed in LLVM 4.0 For the textual format, this patch migrates the existing 2-field form to use the 3-field form and deletes the compatibility code. test/Verifier/global-ctors-2.ll checks we have a friendly error message. For bitcode, lib/IR/AutoUpgrade UpgradeGlobalVariables will upgrade the 2-field form (add i8* null as the third field). Reviewed By: rnk, dexonsmith Differential Revision: https://reviews.llvm.org/D61547 llvm-svn: 360742
93 lines
3.0 KiB
LLVM
93 lines
3.0 KiB
LLVM
; RUN: opt < %s -asan -asan-module -S | FileCheck %s
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; RUN: opt < %s -asan -asan-module -asan-mapping-scale=5 -S | FileCheck %s
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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"
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target triple = "x86_64-unknown-linux-gnu"
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@xxx = internal global i32 0, align 4 ; With dynamic initializer.
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@XXX = global i32 0, align 4 ; With dynamic initializer.
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@yyy = internal global i32 0, align 4 ; W/o dynamic initializer.
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@YYY = global i32 0, align 4 ; W/o dynamic initializer.
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; Clang will emit the following metadata identifying @xxx as dynamically
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; initialized.
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!0 = !{i32* @xxx, null, null, i1 true, i1 false}
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!1 = !{i32* @XXX, null, null, i1 true, i1 false}
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!2 = !{i32* @yyy, null, null, i1 false, i1 false}
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!3 = !{i32* @YYY, null, null, i1 false, i1 false}
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!llvm.asan.globals = !{!0, !1, !2, !3}
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define i32 @initializer() uwtable {
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entry:
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ret i32 42
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}
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define internal void @__cxx_global_var_init() section ".text.startup" {
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entry:
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%call = call i32 @initializer()
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store i32 %call, i32* @xxx, align 4
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ret void
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}
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@llvm.global_ctors = appending global [2 x { i32, void ()*, i8* }] [{ i32, void ()*, i8* } { i32 65535, void ()* @__late_ctor, i8* null }, { i32, void ()*, i8* } { i32 0, void ()* @__early_ctor, i8* null }]
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define internal void @__late_ctor() sanitize_address section ".text.startup" {
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entry:
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call void @__cxx_global_var_init()
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ret void
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}
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; Clang indicated that @xxx was dynamically initailized.
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; __asan_{before,after}_dynamic_init should be called from __late_ctor
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; CHECK-LABEL: define internal void @__late_ctor
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; CHECK-NOT: ret
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; CHECK: call void @__asan_before_dynamic_init
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; CHECK: call void @__cxx_global_var_init
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; CHECK: call void @__asan_after_dynamic_init
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; CHECK: ret
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; CTOR with priority 0 should not be instrumented.
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define internal void @__early_ctor() sanitize_address section ".text.startup" {
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entry:
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call void @__cxx_global_var_init()
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ret void
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}
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; CHECK-LABEL: define internal void @__early_ctor
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; CHECK-NOT: __asan
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; CHECK: ret
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; Check that xxx is instrumented.
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define void @touch_xxx() sanitize_address {
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store i32 0, i32 *@xxx, align 4
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ret void
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; CHECK-LABEL: touch_xxx
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; CHECK: call void @__asan_report_store4
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; CHECK: ret void
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}
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; Check that XXX is instrumented.
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define void @touch_XXX() sanitize_address {
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store i32 0, i32 *@XXX, align 4
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ret void
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; CHECK: define void @touch_XXX
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; CHECK: call void @__asan_report_store4
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; CHECK: ret void
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}
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; Check that yyy is NOT instrumented (as it does not have dynamic initializer).
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define void @touch_yyy() sanitize_address {
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store i32 0, i32 *@yyy, align 4
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ret void
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; CHECK: define void @touch_yyy
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; CHECK-NOT: call void @__asan_report_store4
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; CHECK: ret void
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}
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; Check that YYY is NOT instrumented (as it does not have dynamic initializer).
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define void @touch_YYY() sanitize_address {
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store i32 0, i32 *@YYY, align 4
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ret void
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; CHECK: define void @touch_YYY
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; CHECK-NOT: call void @__asan_report_store4
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; CHECK: ret void
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}
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