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6b3351792c
For a definition (of most linkage types), dso_local is set for ELF -fno-pic/-fpie
and COFF, but not for Mach-O. This nuance causes unneeded binary format differences.
This patch replaces (function) `define ` with `define{{.*}} `,
(variable/constant/alias) `= ` with `={{.*}} `, or inserts appropriate `{{.*}} `
if there is an explicit linkage.
* Clang will set dso_local for Mach-O, which is currently implied by TargetMachine.cpp. This will make COFF/Mach-O and executable ELF similar.
* Eventually I hope we can make dso_local the textual LLVM IR default (write explicit "dso_preemptable" when applicable) and -fpic ELF will be similar to everything else. This patch helps move toward that goal.
30 lines
1.1 KiB
C++
30 lines
1.1 KiB
C++
// RUN: %clang_cc1 -std=c++11 -triple x86_64-apple-darwin10 -emit-llvm -o - %s -fsanitize=alignment | FileCheck %s
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struct S {
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int I;
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};
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extern S g_S;
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extern S array_S[];
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// CHECK-LABEL: define{{.*}} i32 @_Z18load_extern_global
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int load_extern_global() {
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// FIXME: The IR builder constant-folds the alignment check away to 'true'
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// here, so we never call the diagnostic. This is PR32630.
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// CHECK-NOT: ptrtoint i32* {{.*}} to i32, !nosanitize
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// CHECK: [[I:%.*]] = load i32, i32* getelementptr inbounds (%struct.S, %struct.S* @g_S, i32 0, i32 0), align 4
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// CHECK-NEXT: ret i32 [[I]]
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return g_S.I;
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}
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// CHECK-LABEL: define{{.*}} i32 @_Z22load_from_extern_array
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int load_from_extern_array(int I) {
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// CHECK: [[I:%.*]] = getelementptr inbounds %struct.S, %struct.S* {{.*}}, i32 0, i32 0
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// CHECK-NEXT: [[PTRTOINT:%.*]] = ptrtoint i32* [[I]] to i64, !nosanitize
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// CHECK-NEXT: [[AND:%.*]] = and i64 [[PTRTOINT]], 3, !nosanitize
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// CHECK-NEXT: [[ICMP:%.*]] = icmp eq i64 [[AND]], 0, !nosanitize
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// CHECK-NEXT: br i1 [[ICMP]]
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// CHECK: call void @__ubsan_handle_type_mismatch
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return array_S[I].I;
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}
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