[PATCH dwarves v4 11/11] tests: Add a few clang true signature tests

[Yonghong Song <yonghong.song@linux.dev>]

Three tests are added.

Test 1: VERBOSE=1 ./clang_parm_optimized.sh
  BTF:   BTF: int foo(int a, int c);
  DWARF: DWARF: int foo(int a, int b, int c);
where parameber 'b' is unused.

Test 2: VERBOSE=1 ./clang_parm_optimized_stack.sh
  BTF:   BTF: int foo(int a, int i);
  DWARF: DWARF: int foo(int a, int b, int c, int d, int e, int f, int g, int h, int i);
where parameters 'b' to 'h' are unused.

Test 3: VERBOSE=1 ./clang_parm_aggregate.sh
  BTF (x86_64):  long foo(long a__f1, struct t b, int i);
  BTF (aarch64): long foo(struct t a, 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 for x86_64 arch.

Signed-off-by: Yonghong Song <yonghong.song@linux.dev>
---
 tests/clang_parm_aggregate.sh       | 85 +++++++++++++++++++++++++++++
 tests/clang_parm_optimized.sh       | 63 +++++++++++++++++++++
 tests/clang_parm_optimized_stack.sh | 63 +++++++++++++++++++++
 3 files changed, 211 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.sh
new file mode 100755
index 0000000..9502f8b
--- /dev/null
+++ b/tests/clang_parm_aggregate.sh
@@ -0,0 +1,85 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0-only
+
+source test_lib.sh
+
+outdir=$(make_tmpdir)
+
+# Comment this out to save test data.
+trap cleanup EXIT
+
+title_log "Validation of BTF encoding of true_signatures."
+
+clang_true="${outdir}/clang_true"
+CC=$(which clang 2>/dev/null)
+
+if [[ -z "$CC" ]]; then
+	info_log "skip: clang not available"
+	test_skip
+fi
+
+cat > ${clang_true}.c << EOF
+struct t { long f1; long f2; };
+__attribute__((noinline)) static long foo(struct t a, struct t b, int i)
+{
+        return a.f1 + b.f1 + b.f2 + i;
+}
+
+struct t p1, p2;
+int i;
+int main()
+{
+        return (int)foo(p1, p2, i);
+}
+EOF
+
+CFLAGS="$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=objcopy pahole -J --btf_features=+true_signature $clang_true
+if [[ $? -ne 0 ]]; then
+	error_log "Could not encode BTF for $clang_true"
+	test_fail
+fi
+
+btf_optimized=$(pfunct --all --format_path=btf $clang_true |grep "foo")
+if [[ -z "$btf_optimized" ]]; then
+	info_log "skip: no optimizations applied."
+	test_skip
+fi
+
+btf_cmp=$btf_optimized
+dwarf=$(pfunct --all $clang_true |grep "foo")
+
+verbose_log "BTF: $btf_optimized  DWARF: $dwarf"
+
+arch=$(uname -m)
+
+if [[ "$arch" == "x86_64" ]]; then
+	# On x86_64, clang emits DW_CC_nocall for optimized functions,
+	# so pahole should detect the optimization and produce a
+	# different BTF signature.
+	if [[ "$btf_cmp" == "$dwarf" ]]; then
+		error_log "BTF and DWARF signatures should be different and they are not: BTF: $btf_optimized ; DWARF $dwarf"
+		test_fail
+	fi
+elif [[ "$arch" == "aarch64" ]]; then
+	# On arm64, clang does not emit DW_CC_nocall, so pahole cannot
+	# detect the optimization. BTF and DWARF signatures are expected
+	# to be the same.
+	if [[ "$btf_cmp" != "$dwarf" ]]; then
+		error_log "On arm64, BTF and DWARF signatures should be the same but they are not: BTF: $btf_optimized ; DWARF $dwarf"
+		test_fail
+	fi
+else
+	# On other architectures, skip if we cannot determine the
+	# expected behavior.
+	if [[ "$btf_cmp" == "$dwarf" ]]; then
+		info_log "skip: no optimization detected on $arch"
+		test_skip
+	fi
+fi
+test_pass
diff --git a/tests/clang_parm_optimized.sh b/tests/clang_parm_optimized.sh
new file mode 100755
index 0000000..81d50af
--- /dev/null
+++ b/tests/clang_parm_optimized.sh
@@ -0,0 +1,63 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0-only
+
+source test_lib.sh
+
+outdir=$(make_tmpdir)
+
+# Comment this out to save test data.
+trap cleanup EXIT
+
+title_log "Validation of BTF encoding of true_signatures."
+
+clang_true="${outdir}/clang_true"
+CC=$(which clang 2>/dev/null)
+
+if [[ -z "$CC" ]]; then
+	info_log "skip: clang not available"
+	test_skip
+fi
+
+cat > ${clang_true}.c << EOF
+__attribute__((noinline)) static int foo(int a, int b, int c)
+{
+	return a * c - a - c;
+}
+
+int a, b, c;
+int main()
+{
+	return foo(a, b, c);
+}
+EOF
+
+CFLAGS="$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=objcopy pahole -J --btf_features=+true_signature $clang_true
+if [[ $? -ne 0 ]]; then
+	error_log "Could not encode BTF for $clang_true"
+	test_fail
+fi
+
+btf_optimized=$(pfunct --all --format_path=btf $clang_true |grep "foo")
+if [[ -z "$btf_optimized" ]]; then
+	info_log "skip: no optimizations applied."
+	test_skip
+fi
+
+btf_cmp=$btf_optimized
+dwarf=$(pfunct --all $clang_true |grep "foo")
+
+if [[ -n "$VERBOSE" ]]; then
+	printf "   BTF: %s  DWARF: %s\n" "$btf_optimized" "$dwarf"
+fi
+
+if [[ "$btf_cmp" == "$dwarf" ]]; then
+	error_log "BTF and DWARF signatures should be different and they are not: BTF: $btf_optimized ; DWARF $dwarf"
+	test_fail
+fi
+test_pass
diff --git a/tests/clang_parm_optimized_stack.sh b/tests/clang_parm_optimized_stack.sh
new file mode 100755
index 0000000..afdc355
--- /dev/null
+++ b/tests/clang_parm_optimized_stack.sh
@@ -0,0 +1,63 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0-only
+
+source test_lib.sh
+
+outdir=$(make_tmpdir)
+
+# Comment this out to save test data.
+trap cleanup EXIT
+
+title_log "Validation of BTF encoding of true_signatures."
+
+clang_true="${outdir}/clang_true"
+CC=$(which clang 2>/dev/null)
+
+if [[ -z "$CC" ]]; then
+	info_log "skip: clang not available"
+	test_skip
+fi
+
+cat > ${clang_true}.c << EOF
+__attribute__((noinline)) static int foo(int a, int b, int c, int d, int e, int f, int g, int h, int i)
+{
+        return a * i - a - i;
+}
+
+int a, b, c, d, e, f, g, h, i;
+int main()
+{
+        return foo(a, b, c, d, e, f, g, h, i);
+}
+EOF
+
+CFLAGS="$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=objcopy pahole -J --btf_features=+true_signature $clang_true
+if [[ $? -ne 0 ]]; then
+	error_log "Could not encode BTF for $clang_true"
+	test_fail
+fi
+
+btf_optimized=$(pfunct --all --format_path=btf $clang_true |grep "foo")
+if [[ -z "$btf_optimized" ]]; then
+	info_log "skip: no optimizations applied."
+	test_skip
+fi
+
+btf_cmp=$btf_optimized
+dwarf=$(pfunct --all $clang_true |grep "foo")
+
+if [[ -n "$VERBOSE" ]]; then
+	printf "   BTF: %s  DWARF: %s\n" "$btf_optimized" "$dwarf"
+fi
+
+if [[ "$btf_cmp" == "$dwarf" ]]; then
+	error_log "BTF and DWARF signatures should be different and they are not: BTF: $btf_optimized ; DWARF $dwarf"
+	test_fail
+fi
+test_pass
-- 
2.52.0