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 6835D31E839 for ; Fri, 20 Mar 2026 19:10:16 +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=1774033819; cv=none; b=FH2ubBDCOFfE24L7Yb43nyoSO2dK3tq6A4KWEmK98yz0cX7ZDvibE2cwQI+6dln4CyxsYmlPHlPgQwLsO4a3VeT+FtMah0xAB5IVjyK3/f+Wrf4UiXaaZPX8dPy229NCvv/n5AE3SeMiGOnQ+4WIefv3VU6PPccKgF7qXttX0GE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774033819; c=relaxed/simple; bh=6PUSx3EUuEWtxpJFwmqqR+KPtW/iuN2npkRmf+SHj0I=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=cYIFwIADUZe4A8y6kj0es22RDRIQhDozEaoL3mm4epp3LPLX1u4vF42VmagO+2QpyHmuCKCS1GC+2rHvqM9HrT+Q33jXy9LDT0zumyWVrYFg/o5XM+3hxoVI4SbYeCZUApcrsm/RtYRXQV1a3SMBKNnS8RSx/a12n6dQb69jYes= 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 EFF0F2A7EAE37; Fri, 20 Mar 2026 12:10:03 -0700 (PDT) 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 v3 9/9] tests: Add a few clang true signature tests Date: Fri, 20 Mar 2026 12:10:03 -0700 Message-ID: <20260320191003.1975752-1-yonghong.song@linux.dev> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260320190917.1970524-1-yonghong.song@linux.dev> References: <20260320190917.1970524-1-yonghong.song@linux.dev> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Three tests are added. Test 1: VERBOSE=3D1 ./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: VERBOSE=3D1 ./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: VERBOSE=3D1 ./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/clang_parm_aggregate.sh | 63 +++++++++++++++++++++++ tests/clang_parm_optimized.sh | 77 +++++++++++++++++++++++++++++ tests/clang_parm_optimized_stack.sh | 77 +++++++++++++++++++++++++++++ 3 files changed, 217 insertions(+) create mode 100755 tests/clang_parm_aggregate.sh create mode 100755 tests/clang_parm_optimized.sh create mode 100755 tests/clang_parm_optimized_stack.sh diff --git a/tests/clang_parm_aggregate.sh b/tests/clang_parm_aggregate.s= h new file mode 100755 index 0000000..bf47c8c --- /dev/null +++ b/tests/clang_parm_aggregate.sh @@ -0,0 +1,63 @@ +#!/bin/bash +# SPDX-License-Identifier: GPL-2.0-only + +source test_lib.sh + +outdir=3D$(make_tmpdir) + +# Comment this out to save test data. +trap cleanup EXIT + +title_log "Validation of BTF encoding of true_signatures." + +clang_true=3D"${outdir}/clang_true" +CC=3D$(which clang 2>/dev/null) + +if [[ -z "$CC" ]]; then + info_log "skip: clang not available" + test_skip +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 + error_log "Could not compile ${clang_true}.c" + test_fail +fi +LLVM_OBJCOPY=3Dobjcopy pahole -J --btf_features=3D+true_signature $clang= _true +if [[ $? -ne 0 ]]; then + error_log "Could not encode BTF for $clang_true" + test_fail +fi + +btf_optimized=3D$(pfunct --all --format_path=3Dbtf $clang_true |grep "fo= o") +if [[ -z "$btf_optimized" ]]; then + info_log "skip: no optimizations applied." + test_skip +fi + +btf_cmp=3D$btf_optimized +dwarf=3D$(pfunct --all $clang_true |grep "foo") + +verbose_log "BTF: $btf_optimized DWARF: $dwarf" + +if [[ "$btf_cmp" =3D=3D "$dwarf" ]]; then + error_log "BTF and DWARF signatures should be different and they are no= t: BTF: $btf_optimized ; DWARF $dwarf" + test_fail +fi +test_pass diff --git a/tests/clang_parm_optimized.sh b/tests/clang_parm_optimized.s= h new file mode 100755 index 0000000..379e6d5 --- /dev/null +++ b/tests/clang_parm_optimized.sh @@ -0,0 +1,77 @@ +#!/bin/bash +# SPDX-License-Identifier: GPL-2.0-only + +source test_lib.sh + +outdir=3D$(make_tmpdir) + +# Comment this out to save test data. +trap cleanup EXIT + +title_log "Validation of BTF encoding of true_signatures." + +clang_true=3D"${outdir}/clang_true" +CC=3D$(which clang 2>/dev/null) + +if [[ -z "$CC" ]]; then + info_log "skip: clang not available" + test_skip +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 + error_log "Could not compile ${clang_true}.c" + test_fail +fi +LLVM_OBJCOPY=3Dobjcopy pahole -J --btf_features=3D+true_signature $clang= _true +if [[ $? -ne 0 ]]; then + error_log "Could not encode BTF for $clang_true" + test_fail +fi + +btf_optimized=3D$(pfunct --all --format_path=3Dbtf $clang_true |grep "fo= o") +if [[ -z "$btf_optimized" ]]; then + info_log "skip: no optimizations applied." + test_skip +fi + +btf_cmp=3D$btf_optimized +dwarf=3D$(pfunct --all $clang_true |grep "foo") + +if [[ -n "$VERBOSE" ]]; then + printf " BTF: %s DWARF: %s\n" "$btf_optimized" "$dwarf" +fi + +if [[ "$btf_cmp" =3D=3D "$dwarf" ]]; then + error_log "BTF and DWARF signatures should be different and they are no= t: BTF: $btf_optimized ; DWARF $dwarf" + test_fail +fi +test_pass diff --git a/tests/clang_parm_optimized_stack.sh b/tests/clang_parm_optim= ized_stack.sh new file mode 100755 index 0000000..8638af7 --- /dev/null +++ b/tests/clang_parm_optimized_stack.sh @@ -0,0 +1,77 @@ +#!/bin/bash +# SPDX-License-Identifier: GPL-2.0-only + +source test_lib.sh + +outdir=3D$(make_tmpdir) + +# Comment this out to save test data. +trap cleanup EXIT + +title_log "Validation of BTF encoding of true_signatures." + +clang_true=3D"${outdir}/clang_true" +CC=3D$(which clang 2>/dev/null) + +if [[ -z "$CC" ]]; then + info_log "skip: clang not available" + test_skip +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 + error_log "Could not compile ${clang_true}.c" + test_fail +fi +LLVM_OBJCOPY=3Dobjcopy pahole -J --btf_features=3D+true_signature $clang= _true +if [[ $? -ne 0 ]]; then + error_log "Could not encode BTF for $clang_true" + test_fail +fi + +btf_optimized=3D$(pfunct --all --format_path=3Dbtf $clang_true |grep "fo= o") +if [[ -z "$btf_optimized" ]]; then + info_log "skip: no optimizations applied." + test_skip +fi + +btf_cmp=3D$btf_optimized +dwarf=3D$(pfunct --all $clang_true |grep "foo") + +if [[ -n "$VERBOSE" ]]; then + printf " BTF: %s DWARF: %s\n" "$btf_optimized" "$dwarf" +fi + +if [[ "$btf_cmp" =3D=3D "$dwarf" ]]; then + error_log "BTF and DWARF signatures should be different and they are no= t: BTF: $btf_optimized ; DWARF $dwarf" + test_fail +fi +test_pass --=20 2.52.0