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Merged
merged 9 commits into from
Oct 17, 2024
Merged

[PGO] Initialize GCOV Writeout and Reset Functions in the Runtime on AIX #108570

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e1b5e88
Initial commit.
Sep 11, 2024
7c6b1d7
Special code for AIX only.
Sep 12, 2024
258103e
Fix lit test.
Sep 16, 2024
b1eaf18
Improve new test.
Sep 18, 2024
11793f3
Address review comments.
Oct 4, 2024
b7c470a
Fix the code that inserts the .ref pseudo-op when xcoff-roptr is in e…
Oct 4, 2024
9c8505c
Address code review.
Oct 15, 2024
d5fc314
Address review comments.
Oct 16, 2024
426caab
Address code review comments.
Oct 16, 2024
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2 changes: 1 addition & 1 deletion clang/test/CodeGen/attr-function-return.c
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Expand Up @@ -9,7 +9,7 @@
// RUN: | FileCheck %s --check-prefixes=CHECK,CHECK-EXTERN
// RUN: %clang_cc1 -std=gnu2x -triple x86_64-linux-gnu %s -emit-llvm -o - \
// RUN: -mfunction-return=thunk-extern -coverage-data-file=/dev/null \
// RUN: | FileCheck %s --check-prefixes=CHECK-GCOV
// RUN: | FileCheck %s --check-prefix=CHECK-GCOV
// RUN: %clang_cc1 -std=gnu2x -triple x86_64-linux-gnu %s -emit-llvm -o - \
// RUN: -mfunction-return=thunk-extern -fsanitize=address \
// RUN: | FileCheck %s --check-prefix=CHECK-ASAN
Expand Down
16 changes: 8 additions & 8 deletions clang/test/CodeGen/code-coverage.c
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Expand Up @@ -4,17 +4,17 @@
/// 4.8 (default, compatible with gcov 7) emits the exit block the second.
// RUN: rm -rf %t && mkdir %t && cd %t
// RUN: %clang_cc1 -triple x86_64-unknown-unknown -emit-llvm -disable-red-zone -coverage-data-file=/dev/null -coverage-version='304*' %s -o - | \
// RUN: FileCheck --check-prefixes=CHECK,CHECK-ELF,304 %s
// RUN: FileCheck --check-prefixes=CHECK,CHECK-CTOR-INIT,304 %s
// RUN: %clang_cc1 -triple x86_64-unknown-unknown -emit-llvm -disable-red-zone -coverage-data-file=/dev/null -coverage-version='407*' %s -o - | \
// RUN: FileCheck --check-prefixes=CHECK,CHECK-ELF,407 %s
// RUN: FileCheck --check-prefixes=CHECK,CHECK-CTOR-INIT,407 %s
// RUN: %clang_cc1 -triple x86_64-unknown-unknown -emit-llvm -disable-red-zone -coverage-data-file=/dev/null %s -o - | \
// RUN: FileCheck --check-prefixes=CHECK,CHECK-ELF,408 %s
// RUN: FileCheck --check-prefixes=CHECK,CHECK-CTOR-INIT,408 %s
// RUN: %clang_cc1 -triple powerpc64-ibm-aix -emit-llvm -disable-red-zone -coverage-data-file=/dev/null -coverage-version='304*' %s -o - | \
// RUN: FileCheck --check-prefixes=CHECK,CHECK-XCOFF,304 %s
// RUN: FileCheck --check-prefixes=CHECK,CHECK-RT-INIT,304 %s
// RUN: %clang_cc1 -triple powerpc64-ibm-aix -emit-llvm -disable-red-zone -coverage-data-file=/dev/null -coverage-version='407*' %s -o - | \
// RUN: FileCheck --check-prefixes=CHECK,CHECK-XCOFF,407 %s
// RUN: FileCheck --check-prefixes=CHECK,CHECK-RT-INIT,407 %s
// RUN: %clang_cc1 -triple powerpc64-ibm-aix -emit-llvm -disable-red-zone -coverage-data-file=/dev/null %s -o - | \
// RUN: FileCheck --check-prefixes=CHECK,CHECK-XCOFF,408 %s
// RUN: FileCheck --check-prefixes=CHECK,CHECK-RT-INIT,408 %s

// RUN: %clang_cc1 -emit-llvm -disable-red-zone -coverage-notes-file=aaa.gcno -coverage-data-file=bbb.gcda -debug-info-kind=limited -dwarf-version=4 %s -o - | FileCheck %s --check-prefix GCOV_FILE_INFO

Expand Down Expand Up @@ -56,12 +56,12 @@ int test2(int b) {
// 408-SAME: i32 875575338

// Check for gcov initialization function pointers.
// CHECK-XCOFF: @__llvm_covinit_functions = private constant { ptr, ptr } { ptr @__llvm_gcov_writeout, ptr @__llvm_gcov_reset }, section "__llvm_covinit"
// CHECK-RT-INIT: @__llvm_covinit_functions = private constant { ptr, ptr } { ptr @__llvm_gcov_writeout, ptr @__llvm_gcov_reset }, section "__llvm_covinit"

// Check that the noredzone flag is set on the generated functions.

// CHECK: void @__llvm_gcov_writeout() unnamed_addr [[NRZ:#[0-9]+]]
// CHECK-ELF: void @__llvm_gcov_init() unnamed_addr [[NRZ]]
// CHECK-CTOR-INIT: void @__llvm_gcov_init() unnamed_addr [[NRZ]]

// CHECK: attributes [[NRZ]] = { {{.*}}noredzone{{.*}} }

Expand Down
3 changes: 2 additions & 1 deletion compiler-rt/include/profile/InstrProfData.inc
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Expand Up @@ -798,7 +798,8 @@ serializeValueProfDataFrom(ValueProfRecordClosure *Closure,
#define INSTR_PROF_COVNAME_COFF ".lcovn"
#define INSTR_PROF_ORDERFILE_COFF ".lorderfile$M"

// TODO: Placeholder for Windows. We need to revise when we upstream this.
// FIXME: Placeholder for Windows. Windows currently does not initialize
// the GCOV functions in the runtime.
#define INSTR_PROF_COVINIT_COFF ".lcovd$M"

#ifdef _WIN32
Expand Down
3 changes: 2 additions & 1 deletion llvm/include/llvm/ProfileData/InstrProfData.inc
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Expand Up @@ -798,7 +798,8 @@ serializeValueProfDataFrom(ValueProfRecordClosure *Closure,
#define INSTR_PROF_COVNAME_COFF ".lcovn"
#define INSTR_PROF_ORDERFILE_COFF ".lorderfile$M"

// TODO: Placeholder for Windows. We need to revise when we upstream this.
// FIXME: Placeholder for Windows. Windows currently does not initialize
// the GCOV functions in the runtime.
#define INSTR_PROF_COVINIT_COFF ".lcovd$M"

#ifdef _WIN32
Expand Down
9 changes: 7 additions & 2 deletions llvm/lib/Target/PowerPC/PPCAsmPrinter.cpp
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Expand Up @@ -2976,10 +2976,15 @@ void PPCAIXAsmPrinter::emitGCOVRefs() {
/*MultiSymbolsAllowed*/ true);

OutStreamer->switchSection(CtrSection);
const XCOFF::StorageMappingClass MappingClass =
TM.Options.XCOFFReadOnlyPointers ? XCOFF::XMC_RO : XCOFF::XMC_RW;
if (OutContext.hasXCOFFSection(
"__llvm_covinit",
XCOFF::CsectProperties(XCOFF::XMC_RW, XCOFF::XTY_SD))) {
MCSymbol *S = OutContext.getOrCreateSymbol("__llvm_covinit[RW]");
XCOFF::CsectProperties(MappingClass, XCOFF::XTY_SD))) {
const char *SymbolStr = TM.Options.XCOFFReadOnlyPointers
? "__llvm_covinit[RO]"
: "__llvm_covinit[RW]";
MCSymbol *S = OutContext.getOrCreateSymbol(SymbolStr);
OutStreamer->emitXCOFFRefDirective(S);
}
}
Expand Down
4 changes: 3 additions & 1 deletion llvm/lib/Transforms/Instrumentation/GCOVProfiling.cpp
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Expand Up @@ -918,7 +918,9 @@ bool GCOVProfiler::emitProfileNotes(
GlobalVariable *Counters = new GlobalVariable(
*M, CounterTy, false, GlobalValue::InternalLinkage,
Constant::getNullValue(CounterTy), "__llvm_gcov_ctr");
Counters->setSection("__llvm_gcov_ctr_section");
const llvm::Triple &Triple = llvm::Triple(M->getTargetTriple());
if (Triple.getObjectFormat() == llvm::Triple::XCOFF)
Counters->setSection("__llvm_gcov_ctr_section");
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@hubert-reinterpretcast hubert-reinterpretcast Oct 5, 2024 •
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I suggest moving the .ref generation to be from each GCOV-profiled function in the module instead of making this change. This change modifies the counters from being BSS in XCOFF to non-BSS (therefore increasing program load costs).

Not an impediment to landing this patch though.

CountersBySP.emplace_back(Counters, SP);

for (size_t I : llvm::seq<size_t>(0, Measured)) {
Expand Down
129 changes: 129 additions & 0 deletions llvm/test/CodeGen/PowerPC/gcov_ctr_ref_init.ll
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@@ -0,0 +1,129 @@
; Tests if the __llvm_gcov_ctr section contains a .ref pseudo-op
; referring to the __llvm_covinit section.
; RUN: llc < %s | FileCheck --check-prefixes=CHECK,CHECK-RW %s
; RUN: llc -mxcoff-roptr < %s | FileCheck --check-prefixes=CHECK,CHECK-RO %s

target datalayout = "E-m:a-p:32:32-Fi32-i64:64-n32"
target triple = "powerpc-ibm-aix"

; CHECK-RW: .csect __llvm_covinit[RW],3
; CHECK-RO: .csect __llvm_covinit[RO],3
; CHECK: .vbyte 4, __llvm_gcov_writeout[DS]
; CHECK-NEXT: .vbyte 4, __llvm_gcov_reset[DS]
; CHECK: __llvm_gcov_ctr.1:
; CHECK-NEXT: .extern .llvm_gcda_start_file[PR]
; CHECK-NEXT: .extern .llvm_gcda_emit_function[PR]
; CHECK-NEXT: .extern .llvm_gcda_emit_arcs[PR]
; CHECK-NEXT: .extern .llvm_gcda_summary_info[PR]
; CHECK-NEXT: .extern .llvm_gcda_end_file[PR]
; CHECK-RW-NEXT: .ref __llvm_covinit[RW]
; CHECK-RO-NEXT: .ref __llvm_covinit[RO]
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@hubert-reinterpretcast hubert-reinterpretcast Oct 5, 2024

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This seems exceedingly weird. Why would we generate a label for __llvm_gcov_ctr.1: and not specify the space it needs?

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@qiongsiwu qiongsiwu Oct 15, 2024

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Fixed. I think this is because of the global merge that happens in llc.

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Fixed. I think this is because of the global merge that happens in llc.

Okay. We're seeing an existing bug here then. I'll see about getting an issue opened.


%emit_function_args_ty = type { i32, i32, i32 }
%emit_arcs_args_ty = type { i32, ptr }
%file_info = type { %start_file_args_ty, i32, ptr, ptr }
%start_file_args_ty = type { ptr, i32, i32 }

@__llvm_gcov_ctr = internal global [1 x i64] zeroinitializer, section "__llvm_gcov_ctr_section"
@__llvm_gcov_ctr.1 = internal global [1 x i64] zeroinitializer, section "__llvm_gcov_ctr_section"
@0 = private unnamed_addr constant [10 x i8] c"test.gcda\00", align 1
@__llvm_internal_gcov_emit_function_args.0 = internal unnamed_addr constant [2 x %emit_function_args_ty] [%emit_function_args_ty { i32 0, i32 1961870044, i32 -801444649 }, %emit_function_args_ty { i32 1, i32 1795396728, i32 -801444649 }]
@__llvm_internal_gcov_emit_arcs_args.0 = internal unnamed_addr constant [2 x %emit_arcs_args_ty] [%emit_arcs_args_ty { i32 1, ptr @__llvm_gcov_ctr }, %emit_arcs_args_ty { i32 1, ptr @__llvm_gcov_ctr.1 }]
@__llvm_internal_gcov_emit_file_info = internal unnamed_addr constant [1 x %file_info] [%file_info { %start_file_args_ty { ptr @0, i32 875575338, i32 -801444649 }, i32 2, ptr @__llvm_internal_gcov_emit_function_args.0, ptr @__llvm_internal_gcov_emit_arcs_args.0 }]
@__llvm_covinit_functions = private constant { ptr, ptr } { ptr @__llvm_gcov_writeout, ptr @__llvm_gcov_reset }, section "__llvm_covinit", align 8

define i32 @bar() {
entry:
%gcov_ctr = load i64, ptr @__llvm_gcov_ctr, align 8
%0 = add i64 %gcov_ctr, 1
store i64 %0, ptr @__llvm_gcov_ctr, align 8
ret i32 1
}

define i32 @main() {
entry:
%gcov_ctr = load i64, ptr @__llvm_gcov_ctr.1, align 8
%0 = add i64 %gcov_ctr, 1
store i64 %0, ptr @__llvm_gcov_ctr.1, align 8
%retval = alloca i32, align 4
store i32 0, ptr %retval, align 4
%call = call i32 @bar()
%sub = sub nsw i32 %call, 1
ret i32 %sub
}

define internal void @__llvm_gcov_writeout() unnamed_addr {
entry:
br label %file.loop.header

file.loop.header: ; preds = %file.loop.latch, %entry
%file_idx = phi i32 [ 0, %entry ], [ %next_file_idx, %file.loop.latch ]
%0 = getelementptr inbounds [1 x %file_info], ptr @__llvm_internal_gcov_emit_file_info, i32 0, i32 %file_idx
%start_file_args = getelementptr inbounds nuw %file_info, ptr %0, i32 0, i32 0
%1 = getelementptr inbounds nuw %start_file_args_ty, ptr %start_file_args, i32 0, i32 0
%filename = load ptr, ptr %1, align 4
%2 = getelementptr inbounds nuw %start_file_args_ty, ptr %start_file_args, i32 0, i32 1
%version = load i32, ptr %2, align 4
%3 = getelementptr inbounds nuw %start_file_args_ty, ptr %start_file_args, i32 0, i32 2
%stamp = load i32, ptr %3, align 4
call void @llvm_gcda_start_file(ptr %filename, i32 %version, i32 %stamp)
%4 = getelementptr inbounds nuw %file_info, ptr %0, i32 0, i32 1
%num_ctrs = load i32, ptr %4, align 4
%5 = getelementptr inbounds nuw %file_info, ptr %0, i32 0, i32 2
%emit_function_args = load ptr, ptr %5, align 4
%6 = getelementptr inbounds nuw %file_info, ptr %0, i32 0, i32 3
%emit_arcs_args = load ptr, ptr %6, align 4
%7 = icmp slt i32 0, %num_ctrs
br i1 %7, label %counter.loop.header, label %file.loop.latch

counter.loop.header: ; preds = %counter.loop.header, %file.loop.header
%ctr_idx = phi i32 [ 0, %file.loop.header ], [ %15, %counter.loop.header ]
%8 = getelementptr inbounds %emit_function_args_ty, ptr %emit_function_args, i32 %ctr_idx
%9 = getelementptr inbounds nuw %emit_function_args_ty, ptr %8, i32 0, i32 0
%ident = load i32, ptr %9, align 4
%10 = getelementptr inbounds nuw %emit_function_args_ty, ptr %8, i32 0, i32 1
%func_checkssum = load i32, ptr %10, align 4
%11 = getelementptr inbounds nuw %emit_function_args_ty, ptr %8, i32 0, i32 2
%cfg_checksum = load i32, ptr %11, align 4
call void @llvm_gcda_emit_function(i32 %ident, i32 %func_checkssum, i32 %cfg_checksum)
%12 = getelementptr inbounds %emit_arcs_args_ty, ptr %emit_arcs_args, i32 %ctr_idx
%13 = getelementptr inbounds nuw %emit_arcs_args_ty, ptr %12, i32 0, i32 0
%num_counters = load i32, ptr %13, align 4
%14 = getelementptr inbounds nuw %emit_arcs_args_ty, ptr %12, i32 0, i32 1
%counters = load ptr, ptr %14, align 4
call void @llvm_gcda_emit_arcs(i32 %num_counters, ptr %counters)
%15 = add i32 %ctr_idx, 1
%16 = icmp slt i32 %15, %num_ctrs
br i1 %16, label %counter.loop.header, label %file.loop.latch

file.loop.latch: ; preds = %counter.loop.header, %file.loop.header
call void @llvm_gcda_summary_info()
call void @llvm_gcda_end_file()
%next_file_idx = add i32 %file_idx, 1
%17 = icmp slt i32 %next_file_idx, 1
br i1 %17, label %file.loop.header, label %exit

exit: ; preds = %file.loop.latch
ret void
}

declare void @llvm_gcda_start_file(ptr, i32, i32)

declare void @llvm_gcda_emit_function(i32, i32, i32)

declare void @llvm_gcda_emit_arcs(i32, ptr)

declare void @llvm_gcda_summary_info()

declare void @llvm_gcda_end_file()

define internal void @__llvm_gcov_reset() unnamed_addr {
entry:
call void @llvm.memset.p0.i64(ptr @__llvm_gcov_ctr, i8 0, i64 8, i1 false)
call void @llvm.memset.p0.i64(ptr @__llvm_gcov_ctr.1, i8 0, i64 8, i1 false)
ret void
}

declare void @llvm.memset.p0.i64(ptr nocapture writeonly, i8, i64, i1 immarg)


13 changes: 7 additions & 6 deletions llvm/test/Transforms/GCOVProfiling/kcfi-normalize.ll
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Expand Up @@ -3,13 +3,14 @@
; RUN: mkdir -p %t && cd %t
; RUN: opt < %s -S -passes=insert-gcov-profiling \
; RUN: -mtriple=x86_64-unknown-linux-gnu | FileCheck \
; RUN: --check-prefixes=CHECK,CHECK-ELF %s
; RUN: --check-prefixes=CHECK,CHECK-CTOR-INIT %s
; RUN: opt < %s -S -passes=insert-gcov-profiling \
; RUN: -mtriple=powerpc64-ibm-aix | FileCheck \
; RUN: --check-prefixes=CHECK,CHECK-XCOFF %s
; RUN: --check-prefixes=CHECK,CHECK-RT-INIT %s

; Check for gcov initialization function pointers for XCOFF.
; CHECK-XCOFF: @__llvm_covinit_functions = private constant { ptr, ptr } { ptr @__llvm_gcov_writeout, ptr @__llvm_gcov_reset }, section "__llvm_covinit"
; Check for gcov initialization function pointers when we initialize
; the writeout and reset functions in the runtime.
; CHECK-RT-INIT: @__llvm_covinit_functions = private constant { ptr, ptr } { ptr @__llvm_gcov_writeout, ptr @__llvm_gcov_reset }, section "__llvm_covinit"

define dso_local void @empty() !dbg !5 {
entry:
Expand All @@ -35,7 +36,7 @@ entry:
; CHECK-SAME: !kcfi_type ![[#TYPE:]]
; CHECK: define internal void @__llvm_gcov_reset()
; CHECK-SAME: !kcfi_type ![[#TYPE]]
; CHECK-ELF: define internal void @__llvm_gcov_init()
; CHECK-ELF-SAME: !kcfi_type ![[#TYPE]]
; CHECK-CTOR-INIT: define internal void @__llvm_gcov_init()
; CHECK-CTOR-INIT-SAME: !kcfi_type ![[#TYPE]]

; CHECK: ![[#TYPE]] = !{i32 -440107680}
13 changes: 7 additions & 6 deletions llvm/test/Transforms/GCOVProfiling/kcfi.ll
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Expand Up @@ -2,13 +2,14 @@
; RUN: mkdir -p %t && cd %t
; RUN: opt < %s -S -passes=insert-gcov-profiling \
; RUN: -mtriple=x86_64-unknown-linux-gnu | FileCheck \
; RUN: --check-prefixes=CHECK,CHECK-ELF %s
; RUN: --check-prefixes=CHECK,CHECK-CTOR-INIT %s
; RUN: opt < %s -S -passes=insert-gcov-profiling \
; RUN: -mtriple=powerpc64-ibm-aix | FileCheck \
; RUN: --check-prefixes=CHECK,CHECK-XCOFF %s
; RUN: --check-prefixes=CHECK,CHECK-RT-INIT %s

; Check for gcov initialization function pointers for XCOFF.
; CHECK-XCOFF: @__llvm_covinit_functions = private constant { ptr, ptr } { ptr @__llvm_gcov_writeout, ptr @__llvm_gcov_reset }, section "__llvm_covinit"
; Check for gcov initialization function pointers when we initialize
; the writeout and reset functions in the runtime.
; CHECK-RT-INIT: @__llvm_covinit_functions = private constant { ptr, ptr } { ptr @__llvm_gcov_writeout, ptr @__llvm_gcov_reset }, section "__llvm_covinit"

define dso_local void @empty() !dbg !5 {
entry:
Expand All @@ -33,7 +34,7 @@ entry:
; CHECK-SAME: !kcfi_type ![[#TYPE:]]
; CHECK: define internal void @__llvm_gcov_reset()
; CHECK-SAME: !kcfi_type ![[#TYPE]]
; CHECK-ELF: define internal void @__llvm_gcov_init()
; CHECK-ELF-SAME: !kcfi_type ![[#TYPE]]
; CHECK-CTOR-INIT: define internal void @__llvm_gcov_init()
; CHECK-CTOR-INIT-SAME: !kcfi_type ![[#TYPE]]

; CHECK: ![[#TYPE]] = !{i32 -1522505972}
11 changes: 6 additions & 5 deletions llvm/test/Transforms/GCOVProfiling/module-flags.ll
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@@ -1,13 +1,14 @@
; RUN: mkdir -p %t && cd %t
; RUN: opt < %s -S -passes=insert-gcov-profiling \
; RUN: -mtriple=x86_64-unknown-linux-gnu | FileCheck \
; RUN: --check-prefixes=CHECK,CHECK-ELF %s
; RUN: --check-prefixes=CHECK,CHECK-CTOR-INIT %s
; RUN: opt < %s -S -passes=insert-gcov-profiling \
; RUN: -mtriple=powerpc64-ibm-aix | FileCheck \
; RUN: --check-prefixes=CHECK,CHECK-XCOFF %s
; RUN: --check-prefixes=CHECK,CHECK-RT-INIT %s

; Check for gcov initialization function pointers for XCOFF.
; CHECK-XCOFF: @__llvm_covinit_functions = private constant { ptr, ptr } { ptr @__llvm_gcov_writeout, ptr @__llvm_gcov_reset }, section "__llvm_covinit"
; Check for gcov initialization function pointers when we initialize
; the writeout and reset functions in the runtime.
; CHECK-RT-INIT: @__llvm_covinit_functions = private constant { ptr, ptr } { ptr @__llvm_gcov_writeout, ptr @__llvm_gcov_reset }, section "__llvm_covinit"

define dso_local void @empty() !dbg !5 {
entry:
Expand Down Expand Up @@ -36,5 +37,5 @@ entry:
;; Infer uwtable and "frame-pointer" from the module flags.
; CHECK: define internal void @__llvm_gcov_writeout() unnamed_addr #[[#ATTR:]]
; CHECK: define internal void @__llvm_gcov_reset() unnamed_addr #[[#ATTR]]
; CHECK-ELF: define internal void @__llvm_gcov_init() unnamed_addr #[[#ATTR]]
; CHECK-CTOR-INIT: define internal void @__llvm_gcov_init() unnamed_addr #[[#ATTR]]
; CHECK: attributes #[[#ATTR]] = { noinline nounwind uwtable "frame-pointer"="all" }
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