From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from 66-220-155-178.mail-mxout.facebook.com (66-220-155-178.mail-mxout.facebook.com [66.220.155.178]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 37D1D364EA3 for ; Thu, 5 Mar 2026 22:55:51 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=66.220.155.178 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772751353; cv=none; b=H1RL6TBtE1cxYfsAAhO4bS+nF7sExrp8Z/Nw5WwLSyaLilohfUfQIRTFqC/Z730rogJZJsjgTkmzOemnd15qQf24f56H9iysDuISJi9Fze4x1K+uZzGAij+esCm6uD4brS4V0fwLkPD89uZmO4L7H+pGUkYr6irXKWuySVma53g= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772751353; c=relaxed/simple; bh=SjqU1PCjJxWDURIZKigdDFtT346ulOxagGcQxxkHQSk=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=aHM2gtkab85T4sXhZKROe7REFhu69z6pPjwZujgi8qDzPWpwV98uFF/q6bz4Nemfo03irIPeDY8i4sqJkrn/Qi3TOyMxhoMab3X5dHvcCcL4c9MxWuLEaFZlq447/sbZ5jztewTmIPu9DSu0UcYeX5bIw2YZyegThz2xjus6KFI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.dev; spf=fail smtp.mailfrom=linux.dev; arc=none smtp.client-ip=66.220.155.178 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=fail smtp.mailfrom=linux.dev Received: by devvm16039.vll0.facebook.com (Postfix, from userid 128203) id 09D9D22AAAB99; Thu, 5 Mar 2026 14:55:42 -0800 (PST) From: Yonghong Song To: Alan Maguire , Arnaldo Carvalho de Melo , dwarves@vger.kernel.org Cc: Alexei Starovoitov , Andrii Nakryiko , bpf@vger.kernel.org, kernel-team@fb.com Subject: [PATCH dwarves 9/9] tests: Add a few clang true signature tests Date: Thu, 5 Mar 2026 14:55:42 -0800 Message-ID: <20260305225542.1158464-1-yonghong.song@linux.dev> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260305225455.1151066-1-yonghong.song@linux.dev> References: <20260305225455.1151066-1-yonghong.song@linux.dev> Precedence: bulk X-Mailing-List: dwarves@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Three tests are added. Test 1: clang_parm_optimized.sh BTF: char * foo(struct t * a, struct t * d); DWARF: char * foo(struct t * a, int b, struct t * d); where parameber 'b' is unused. Test 2: clang_parm_optimized_stack.sh BTF: char * foo(struct t * a, struct t * d); DWARF: char * foo(struct t * a, int b1, int b2, int b3, int b4, int b5,= int b6, struct t * d); where parameters 'b1' to 'b6' are unused. Test 3: clang_parm_aggregate.sh BTF: long foo(long a__f1, struct t b, int i); DWARF: long foo(struct t a, struct t b, int i); where the 'struct t' definition is 'struct t { long f1; long f2; };', and a.f2 is not used in the function. Signed-off-by: Yonghong Song --- tests/true_signatures/clang_parm_aggregate.sh | 83 ++++++++++++++++ tests/true_signatures/clang_parm_optimized.sh | 95 +++++++++++++++++++ .../clang_parm_optimized_stack.sh | 95 +++++++++++++++++++ .../gcc_true_signatures.sh | 0 4 files changed, 273 insertions(+) create mode 100755 tests/true_signatures/clang_parm_aggregate.sh create mode 100755 tests/true_signatures/clang_parm_optimized.sh create mode 100755 tests/true_signatures/clang_parm_optimized_stack.sh rename tests/{ =3D> true_signatures}/gcc_true_signatures.sh (100%) diff --git a/tests/true_signatures/clang_parm_aggregate.sh b/tests/true_s= ignatures/clang_parm_aggregate.sh new file mode 100755 index 0000000..6d92701 --- /dev/null +++ b/tests/true_signatures/clang_parm_aggregate.sh @@ -0,0 +1,83 @@ +#!/bin/bash +# SPDX-License-Identifier: GPL-2.0-only + +outdir=3D + +fail() +{ + # Do not remove test dir; might be useful for analysis + trap - EXIT + if [[ -d "$outdir" ]]; then + echo "Test data is in $outdir" + fi + exit 1 +} + +cleanup() +{ + rm ${outdir}/* + rmdir $outdir +} + +outdir=3D$(mktemp -d /tmp/clang_true.sh.XXXXXX) + +trap cleanup EXIT + +echo -n "Validation of BTF encoding of true_signatures: " + +clang_true=3D"${outdir}/clang_true" +CC=3D$(which clang 2>/dev/null) + +if [[ -z "$CC" ]]; then + echo "skip: clang not available" + exit 2 +fi + +cat > ${clang_true}.c << EOF +struct t { long f1; long f2; }; +__attribute__((noinline)) static long foo(struct t a, struct t b, int i) +{ + return a.f1 + b.f1 + b.f2 + i; +} + +struct t p1, p2; +int i; +int main() +{ + return (int)foo(p1, p2, i); +} +EOF + +CFLAGS=3D"$CFLAGS -g -O2" +${CC} ${CFLAGS} -o $clang_true ${clang_true}.c +if [[ $? -ne 0 ]]; then + echo "Could not compile ${clang_true}.c" >& 2 + exit 1 +fi +LLVM_OBJCOPY=3Dobjcopy pahole -J --btf_features=3D+true_signature $clang= _true +if [[ $? -ne 0 ]]; then + echo "Could not encode BTF for $clang_true" + exit 1 +fi + +btf_optimized=3D$(pfunct --all --format_path=3Dbtf $clang_true |grep "fo= o") +if [[ -z "$btf_optimized" ]]; then + echo "skip: no optimizations applied." + exit 2 +fi + +btf_cmp=3D$btf_optimized +dwarf=3D$(pfunct --all $clang_true |grep "foo") + +test -n "$VERBOSE" && printf "\nBTF: $btf_optimized DWARF: $dwarf \n" + +if [[ "$btf_cmp" =3D=3D "$dwarf" ]]; then + echo "BTF and DWARF signatures should be different and they are not: BT= F: $btf_optimized ; DWARF $dwarf" + exit 1 +else + echo "" + echo " BTF: $btf_optimized" + echo " DWARF: $dwarf" +fi +echo "Ok" +exit 0 diff --git a/tests/true_signatures/clang_parm_optimized.sh b/tests/true_s= ignatures/clang_parm_optimized.sh new file mode 100755 index 0000000..3022e2b --- /dev/null +++ b/tests/true_signatures/clang_parm_optimized.sh @@ -0,0 +1,95 @@ +#!/bin/bash +# SPDX-License-Identifier: GPL-2.0-only + +outdir=3D + +fail() +{ + # Do not remove test dir; might be useful for analysis + trap - EXIT + if [[ -d "$outdir" ]]; then + echo "Test data is in $outdir" + fi + exit 1 +} + +cleanup() +{ + rm ${outdir}/* + rmdir $outdir +} + +outdir=3D$(mktemp -d /tmp/clang_true.sh.XXXXXX) + +trap cleanup EXIT + +echo -n "Validation of BTF encoding of true_signatures: " + +clang_true=3D"${outdir}/clang_true" +CC=3D$(which clang 2>/dev/null) + +if [[ -z "$CC" ]]; then + echo "skip: clang not available" + exit 2 +fi + +cat > ${clang_true}.c << EOF +struct t { int a; }; +__attribute__((noinline)) char *tar(struct t *a, struct t *d) +{ + if (a->a =3D=3D d->a) + return (char *)10; + else + return (char *)0; +} + +__attribute__((noinline)) static char * foo(struct t *a, int b, struct t= *d) +{ + return tar(a, d); +} + +__attribute__((noinline)) char *bar(struct t *a, struct t *d) +{ + return foo(a, 1, d); +} + +struct t p1, p2; +int main() +{ + return !!bar(&p1, &p2); +} +EOF + +CFLAGS=3D"$CFLAGS -g -O2" +${CC} ${CFLAGS} -o $clang_true ${clang_true}.c +if [[ $? -ne 0 ]]; then + echo "Could not compile ${clang_true}.c" >& 2 + exit 1 +fi +LLVM_OBJCOPY=3Dobjcopy pahole -J --btf_features=3D+true_signature $clang= _true +if [[ $? -ne 0 ]]; then + echo "Could not encode BTF for $clang_true" + exit 1 +fi + +btf_optimized=3D$(pfunct --all --format_path=3Dbtf $clang_true |grep "fo= o") +if [[ -z "$btf_optimized" ]]; then + echo "skip: no optimizations applied." + exit 2 +fi + +btf_cmp=3D$btf_optimized +dwarf=3D$(pfunct --all $clang_true |grep "foo") + +test -n "$VERBOSE" && printf "\nBTF: $btf_optimized DWARF: $dwarf \n" + +if [[ "$btf_cmp" =3D=3D "$dwarf" ]]; then + echo "BTF and DWARF signatures should be different and they are not: BT= F: $btf_optimized ; DWARF $dwarf" + exit 1 +else + echo "" + echo " BTF: $btf_optimized" + echo " DWARF: $dwarf" +fi +echo "Ok" +exit 0 diff --git a/tests/true_signatures/clang_parm_optimized_stack.sh b/tests/= true_signatures/clang_parm_optimized_stack.sh new file mode 100755 index 0000000..1abb96d --- /dev/null +++ b/tests/true_signatures/clang_parm_optimized_stack.sh @@ -0,0 +1,95 @@ +#!/bin/bash +# SPDX-License-Identifier: GPL-2.0-only + +outdir=3D + +fail() +{ + # Do not remove test dir; might be useful for analysis + trap - EXIT + if [[ -d "$outdir" ]]; then + echo "Test data is in $outdir" + fi + exit 1 +} + +cleanup() +{ + rm ${outdir}/* + rmdir $outdir +} + +outdir=3D$(mktemp -d /tmp/clang_true.sh.XXXXXX) + +trap cleanup EXIT + +echo -n "Validation of BTF encoding of true_signatures: " + +clang_true=3D"${outdir}/clang_true" +CC=3D$(which clang 2>/dev/null) + +if [[ -z "$CC" ]]; then + echo "skip: clang not available" + exit 2 +fi + +cat > ${clang_true}.c << EOF +struct t { int a; }; +__attribute__((noinline)) char *tar(struct t *a, struct t *d) +{ + if (a->a =3D=3D d->a) + return (char *)10; + else + return (char *)0; +} + +__attribute__((noinline)) static char * foo(struct t *a, int b1, int b2,= int b3, int b4, int b5, int b6, struct t *d) +{ + return tar(a, d); +} + +__attribute__((noinline)) char *bar(struct t *a, struct t *d) +{ + return foo(a, 1, 2, 3, 4, 5, 6, d); +} + +struct t p1, p2; +int main() +{ + return !!bar(&p1, &p2); +} +EOF + +CFLAGS=3D"$CFLAGS -g -O2" +${CC} ${CFLAGS} -o $clang_true ${clang_true}.c +if [[ $? -ne 0 ]]; then + echo "Could not compile ${clang_true}.c" >& 2 + exit 1 +fi +LLVM_OBJCOPY=3Dobjcopy pahole -J --btf_features=3D+true_signature $clang= _true +if [[ $? -ne 0 ]]; then + echo "Could not encode BTF for $clang_true" + exit 1 +fi + +btf_optimized=3D$(pfunct --all --format_path=3Dbtf $clang_true |grep "fo= o") +if [[ -z "$btf_optimized" ]]; then + echo "skip: no optimizations applied." + exit 2 +fi + +btf_cmp=3D$btf_optimized +dwarf=3D$(pfunct --all $clang_true |grep "foo") + +test -n "$VERBOSE" && printf "\nBTF: $btf_optimized DWARF: $dwarf \n" + +if [[ "$btf_cmp" =3D=3D "$dwarf" ]]; then + echo "BTF and DWARF signatures should be different and they are not: BT= F: $btf_optimized ; DWARF $dwarf" + exit 1 +else + echo "" + echo " BTF: $btf_optimized" + echo " DWARF: $dwarf" +fi +echo "Ok" +exit 0 diff --git a/tests/gcc_true_signatures.sh b/tests/true_signatures/gcc_tru= e_signatures.sh similarity index 100% rename from tests/gcc_true_signatures.sh rename to tests/true_signatures/gcc_true_signatures.sh --=20 2.47.3