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[Instrumentation][X86] Limit setting large section flag to medium/large code models #75542

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Dec 15, 2023
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[Instrumentation][X86] Limit setting large section flag to medium/large code models #75542

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[Instrumentation][X86] Limit setting large section flag to medium/lar…
aeubanks Dec 14, 2023
abdfa15
use Module::getCodeModel() instead
aeubanks Dec 15, 2023
8b59a3d
update test comment
aeubanks Dec 15, 2023
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13 changes: 9 additions & 4 deletions llvm/lib/Transforms/Instrumentation/Instrumentation.cpp
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Expand Up @@ -87,8 +87,13 @@ Comdat *llvm::getOrCreateFunctionComdat(Function &F, Triple &T) {

void llvm::setGlobalVariableLargeSection(const Triple &TargetTriple,
GlobalVariable &GV) {
if (TargetTriple.getArch() == Triple::x86_64 &&
TargetTriple.getObjectFormat() == Triple::ELF) {
GV.setCodeModel(CodeModel::Large);
}
// Limit to x86-64 ELF.
if (TargetTriple.getArch() != Triple::x86_64 ||
TargetTriple.getObjectFormat() != Triple::ELF)
return;
// Limit to medium/large code models.
std::optional<CodeModel::Model> CM = GV.getParent()->getCodeModel();
if (!CM || (*CM != CodeModel::Medium && *CM != CodeModel::Large))
return;
GV.setCodeModel(CodeModel::Large);
}
13 changes: 13 additions & 0 deletions llvm/test/Instrumentation/AddressSanitizer/global-metadata-code-model-medium.ll
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@@ -0,0 +1,13 @@
;; Check that asan_globals is marked large under x86-64 medium code model.
; RUN: opt < %s -mtriple=x86_64-unknown-linux-gnu -passes=asan -S | FileCheck %s --check-prefixes=CHECK,X8664
; RUN: opt < %s -mtriple=ppc64-unknown-linux-gnu -passes=asan -S | FileCheck %s --check-prefixes=CHECK,PPC

; CHECK: @__asan_global_global =
; X8664-SAME: code_model "large"
; PPC-NOT: code_model "large"

@global = global i32 0, align 4

!llvm.module.flags = !{!0}

!0 = !{i32 1, !"Code Model", i32 3}
7 changes: 7 additions & 0 deletions llvm/test/Instrumentation/AddressSanitizer/global-metadata-code-model-small.ll
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@@ -0,0 +1,7 @@
;; Check that asan_globals is not marked large without an explicit code model.
; RUN: opt < %s -mtriple=x86_64-unknown-linux-gnu -passes=asan -S | FileCheck %s

; CHECK: @__asan_global_global =
; CHECK-NOT: code_model "large"

@global = global i32 0, align 4
10 changes: 0 additions & 10 deletions llvm/test/Instrumentation/AddressSanitizer/global_metadata_code_model.ll
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25 changes: 0 additions & 25 deletions llvm/test/Instrumentation/InstrProfiling/icall-comdat.ll
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Expand Up @@ -15,10 +15,6 @@
; RUN: opt %s -mtriple=powerpc64-ibm-aix -passes=instrprof -S | FileCheck %s --check-prefix=ALIGN
; RUN: opt %s -mtriple=x86_64-unknown-linux -passes=instrprof -S | FileCheck %s --check-prefix=ALIGN

;; Check that globals have the proper code model.
; RUN: opt %s -mtriple=x86_64-unknown-linux -passes=instrprof -S | FileCheck %s --check-prefixes=CODEMODEL,CODEMODEL-X8664
; RUN: opt %s -mtriple=powerpc-unknown-linux -passes=instrprof -S | FileCheck %s --check-prefixes=CODEMODEL,CODEMODEL-PPC

@__profn_foo = private constant [3 x i8] c"foo"
@__profn_bar = private constant [3 x i8] c"bar"

Expand Down Expand Up @@ -78,24 +74,3 @@ attributes #0 = { nounwind }
; ALIGN: @__profd_bar = private global {{.*}} section "__llvm_prf_data",{{.*}} align 8
; ALIGN: @__llvm_prf_vnodes = private global {{.*}} section "__llvm_prf_vnds",{{.*}} align 8
; ALIGN: @__llvm_prf_nm = private constant {{.*}} section "__llvm_prf_names",{{.*}} align 1

; CODEMODEL: @__profc_foo =
; CODEMODEL-NOT: code_model "large"
; CODEMODEL: @__profvp_foo =
; CODEMODEL-X8664-SAME: code_model "large"
; CODEMODEL-PPC-NOT: code_model
; CODEMODEL: @__profd_foo =
; CODEMODEL-NOT: code_model "large"
; CODEMODEL: @__profc_bar =
; CODEMODEL-NOT: code_model "large"
; CODEMODEL: @__profvp_bar =
; CODEMODEL-X8664-SAME: code_model "large"
; CODEMODEL-PPC-NOT: code_model
; CODEMODEL: @__profd_bar =
; CODEMODEL-NOT: code_model "large"
; CODEMODEL: @__llvm_prf_vnodes =
; CODEMODEL-X8664-SAME: code_model "large"
; CODEMODEL-PPC-NOT: code_model
; CODEMODEL: @__llvm_prf_nm =
; CODEMODEL-X8664-SAME: code_model "large"
; CODEMODEL-PPC-NOT: code_model
35 changes: 35 additions & 0 deletions llvm/test/Instrumentation/InstrProfiling/section-code-model-large.ll
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;; Check that certain globals are in large sections under x86-64 large code model.
; RUN: opt %s -mtriple=x86_64-unknown-linux -passes=instrprof -S | FileCheck %s

@__profn_foo = private constant [3 x i8] c"foo"

define i32 @foo(ptr) {
call void @llvm.instrprof.increment(ptr @__profn_foo, i64 12884901887, i32 1, i32 0)
%2 = ptrtoint ptr %0 to i64
call void @llvm.instrprof.value.profile(ptr @__profn_foo, i64 12884901887, i64 %2, i32 0, i32 0)
%3 = tail call i32 %0()
ret i32 %3
}

; Function Attrs: nounwind
declare void @llvm.instrprof.increment(ptr, i64, i32, i32) #0

; Function Attrs: nounwind
declare void @llvm.instrprof.value.profile(ptr, i64, i64, i32, i32) #0

attributes #0 = { nounwind }

!llvm.module.flags = !{!0}

!0 = !{i32 1, !"Code Model", i32 4}

; CHECK: @__profc_foo =
; CHECK-NOT: code_model "large"
; CHECK: @__profvp_foo =
; CHECK-SAME: code_model "large"
; CHECK: @__profd_foo =
; CHECK-NOT: code_model "large"
; CHECK: @__llvm_prf_vnodes =
; CHECK-SAME: code_model "large"
; CHECK: @__llvm_prf_nm =
; CHECK-SAME: code_model "large"
39 changes: 39 additions & 0 deletions llvm/test/Instrumentation/InstrProfiling/section-code-model-medium.ll
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@@ -0,0 +1,39 @@
;; Check that certain globals are in large sections under x86-64 medium code model (but not in other arches).
; RUN: opt %s -mtriple=x86_64-unknown-linux -passes=instrprof -S | FileCheck %s --check-prefixes=CHECK,X8664
; RUN: opt %s -mtriple=ppc64-unknown-linux -passes=instrprof -S | FileCheck %s --check-prefixes=CHECK,PPC

@__profn_foo = private constant [3 x i8] c"foo"

define i32 @foo(ptr) {
call void @llvm.instrprof.increment(ptr @__profn_foo, i64 12884901887, i32 1, i32 0)
%2 = ptrtoint ptr %0 to i64
call void @llvm.instrprof.value.profile(ptr @__profn_foo, i64 12884901887, i64 %2, i32 0, i32 0)
%3 = tail call i32 %0()
ret i32 %3
}

; Function Attrs: nounwind
declare void @llvm.instrprof.increment(ptr, i64, i32, i32) #0

; Function Attrs: nounwind
declare void @llvm.instrprof.value.profile(ptr, i64, i64, i32, i32) #0

attributes #0 = { nounwind }

!llvm.module.flags = !{!0}

!0 = !{i32 1, !"Code Model", i32 3}

; CHECK: @__profc_foo =
; CHECK-NOT: code_model "large"
; CHECK: @__profvp_foo =
; X8664-SAME: code_model "large"
; PPC-NOT: code_model "large"
; CHECK: @__profd_foo =
; CHECK-NOT: code_model "large"
; CHECK: @__llvm_prf_vnodes =
; X8664-SAME: code_model "large"
; PPC-NOT: code_model "large"
; CHECK: @__llvm_prf_nm =
; X8664-SAME: code_model "large"
; PPC-NOT: code_model "large"
35 changes: 35 additions & 0 deletions llvm/test/Instrumentation/InstrProfiling/section-code-model-small.ll
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@@ -0,0 +1,35 @@
;; Check that globals are not marked large under x86-64 small code model.
; RUN: opt %s -mtriple=x86_64-unknown-linux -passes=instrprof -S | FileCheck %s

@__profn_foo = private constant [3 x i8] c"foo"

define i32 @foo(ptr) {
call void @llvm.instrprof.increment(ptr @__profn_foo, i64 12884901887, i32 1, i32 0)
%2 = ptrtoint ptr %0 to i64
call void @llvm.instrprof.value.profile(ptr @__profn_foo, i64 12884901887, i64 %2, i32 0, i32 0)
%3 = tail call i32 %0()
ret i32 %3
}

; Function Attrs: nounwind
declare void @llvm.instrprof.increment(ptr, i64, i32, i32) #0

; Function Attrs: nounwind
declare void @llvm.instrprof.value.profile(ptr, i64, i64, i32, i32) #0

attributes #0 = { nounwind }

!llvm.module.flags = !{!0}

!0 = !{i32 1, !"Code Model", i32 1}

; CHECK: @__profc_foo =
; CHECK-NOT: code_model "large"
; CHECK: @__profvp_foo =
; CHECK-NOT: code_model "large"
; CHECK: @__profd_foo =
; CHECK-NOT: code_model "large"
; CHECK: @__llvm_prf_vnodes =
; CHECK-NOT: code_model "large"
; CHECK: @__llvm_prf_nm =
; CHECK-NOT: code_model "large"