1; There are two main cases where comdats are necessary: 2; 1. standard inline functions (weak_odr / linkonce_odr) 3; 2. available externally functions (C99 inline / extern template / dllimport) 4; Check that we do the right thing for the two object formats with comdats, ELF 5; and COFF. 6; 7; Test comdat functions. Non-comdat functions are tested in linkage.ll. 8; RUN: split-file %s %t 9; RUN: cat %t/main.ll %t/disable.ll > %t0.ll 10; RUN: cat %t/main.ll %t/enable.ll > %t1.ll 11; RUN: opt < %t0.ll -mtriple=x86_64-linux -passes=instrprof -S | FileCheck %s --check-prefixes=ELF,ELF0 12; RUN: opt < %t1.ll -mtriple=x86_64-linux -passes=instrprof -S | FileCheck %s --check-prefixes=ELF,ELF1 13; RUN: opt < %t0.ll -mtriple=x86_64-windows -passes=instrprof -S | FileCheck %s --check-prefixes=COFF,COFF0 14; RUN: opt < %t1.ll -mtriple=x86_64-windows -passes=instrprof -S | FileCheck %s --check-prefixes=COFF,COFF1 15 16;--- main.ll 17declare void @llvm.instrprof.increment(ptr, i64, i32, i32) 18 19$foo_inline = comdat any 20$foo_extern = comdat any 21$foo_private_profn = comdat any 22 23@__profn_foo_inline = linkonce_odr hidden constant [10 x i8] c"foo_inline" 24@__profn_foo_extern = linkonce_odr hidden constant [10 x i8] c"foo_extern" 25@__profn_foo_private_profn = private constant [17 x i8] c"foo_private_profn" 26 27;; When value profiling is disabled, __profd_ variables are not referenced by 28;; code. We can use private linkage. When enabled, __profd_ needs to be 29;; non-local which requires separate comdat on COFF due to a link.exe limitation. 30 31; ELF: @__profc_foo_inline = linkonce_odr hidden global {{.*}}, section "__llvm_prf_cnts", comdat, align 8 32; ELF0: @__profd_foo_inline = private global {{.*}}, section "__llvm_prf_data", comdat($__profc_foo_inline), align 8 33; ELF1: @__profd_foo_inline = linkonce_odr hidden global {{.*}}, section "__llvm_prf_data", comdat($__profc_foo_inline), align 8 34; COFF0: @__profc_foo_inline = linkonce_odr hidden global {{.*}}, section ".lprfc$M", comdat, align 8 35; COFF0: @__profd_foo_inline = internal global {{.*}}, section ".lprfd$M", comdat($__profc_foo_inline), align 8 36; COFF1: @__profc_foo_inline = linkonce_odr hidden global {{.*}}, section ".lprfc$M", comdat, align 8 37; COFF1: @__profd_foo_inline = linkonce_odr hidden global {{.*}}, section ".lprfd$M", comdat, align 8 38define weak_odr void @foo_inline() comdat { 39 call void @llvm.instrprof.increment(ptr @__profn_foo_inline, i64 0, i32 1, i32 0) 40 ret void 41} 42 43; ELF: @__profc_foo_extern = linkonce_odr hidden global{{.*}}, section "__llvm_prf_cnts", comdat, align 8 44; ELF0: @__profd_foo_extern = private global{{.*}}, section "__llvm_prf_data", comdat($__profc_foo_extern), align 8 45; ELF1: @__profd_foo_extern = linkonce_odr hidden global{{.*}}, section "__llvm_prf_data", comdat($__profc_foo_extern), align 8 46; COFF: @__profc_foo_extern = linkonce_odr hidden global{{.*}}, section ".lprfc$M", comdat, align 8 47; COFF0: @__profd_foo_extern = internal global{{.*}}, section ".lprfd$M", comdat($__profc_foo_extern), align 8 48; COFF1: @__profd_foo_extern = linkonce_odr hidden global{{.*}}, section ".lprfd$M", comdat, align 8 49define available_externally void @foo_extern() { 50 call void @llvm.instrprof.increment(ptr @__profn_foo_extern, i64 0, i32 1, i32 0) 51 ret void 52} 53 54; ELF: @__profc_foo_private_profn = private global{{.*}}, section "__llvm_prf_cnts", comdat, align 8 55; ELF0: @__profd_foo_private_profn = private global{{.*}}, section "__llvm_prf_data", comdat($__profc_foo_private_profn), align 8 56; ELF1: @__profd_foo_private_profn = private global{{.*}}, section "__llvm_prf_data", comdat($__profc_foo_private_profn), align 8 57; COFF: @__profc_foo_private_profn = internal global{{.*}}, section ".lprfc$M", comdat, align 8 58; COFF0: @__profd_foo_private_profn = internal global{{.*}}, section ".lprfd$M", comdat($__profc_foo_private_profn), align 8 59; COFF1: @__profd_foo_private_profn = internal global{{.*}}, section ".lprfd$M", comdat, align 8 60define void @foo_private_profn() comdat { 61 call void @llvm.instrprof.increment(ptr @__profn_foo_private_profn, i64 0, i32 1, i32 0) 62 ret void 63} 64 65; ELF: @llvm.compiler.used = appending global [3 x ptr] [ptr @__profd_foo_inline, ptr @__profd_foo_extern, ptr @__profd_foo_private_profn] 66; COFF0: @llvm.compiler.used = appending global [4 x ptr] [ptr @__llvm_profile_runtime_user, ptr @__profd_foo_inline, ptr @__profd_foo_extern, ptr @__profd_foo_private_profn] 67; COFF1: @llvm.used = appending global [5 x ptr] [ptr @__llvm_profile_runtime_user, ptr @__profd_foo_inline, ptr @__profd_foo_extern, ptr @__profd_foo_private_profn, ptr @__llvm_prf_nm] 68 69;--- disable.ll 70!llvm.module.flags = !{!0} 71!0 = !{i32 2, !"EnableValueProfiling", i32 0} 72 73;--- enable.ll 74!llvm.module.flags = !{!0} 75!0 = !{i32 2, !"EnableValueProfiling", i32 1} 76