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Message-Id: <20230311065753.3012826-10-irogers@google.com>
Date: Fri, 10 Mar 2023 22:57:49 -0800
From: Ian Rogers <irogers@...gle.com>
To: Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...hat.com>,
Arnaldo Carvalho de Melo <acme@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Jiri Olsa <jolsa@...nel.org>,
Namhyung Kim <namhyung@...nel.org>,
Nathan Chancellor <nathan@...nel.org>,
Nick Desaulniers <ndesaulniers@...gle.com>,
Tom Rix <trix@...hat.com>,
Roberto Sassu <roberto.sassu@...wei.com>,
Quentin Monnet <quentin@...valent.com>,
Andres Freund <andres@...razel.de>,
Tiezhu Yang <yangtiezhu@...ngson.cn>,
Pavithra Gurushankar <gpavithrasha@...il.com>,
Yang Jihong <yangjihong1@...wei.com>,
Adrian Hunter <adrian.hunter@...el.com>,
Leo Yan <leo.yan@...aro.org>,
"Martin Liška" <mliska@...e.cz>,
linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
llvm@...ts.linux.dev
Cc: Stephane Eranian <eranian@...gle.com>,
Ian Rogers <irogers@...gle.com>
Subject: [PATCH v1 09/13] perf symbol: Add abi::__cxa_demangle C++ demangling support
Refactor C++ demangling out of symbol-elf into its own files similar
to other languages. Add abi::__cxa_demangle support. As the other
demanglers are not shippable with distributions, this brings back C++
demangling in a common case. It isn't perfect as the support for
optionally demangling arguments and modifiers isn't present.
Signed-off-by: Ian Rogers <irogers@...gle.com>
---
tools/perf/Makefile.config | 29 +++++++++---------
tools/perf/util/Build | 1 +
tools/perf/util/demangle-cxx.cpp | 50 ++++++++++++++++++++++++++++++++
tools/perf/util/demangle-cxx.h | 16 ++++++++++
tools/perf/util/symbol-elf.c | 37 +++++------------------
5 files changed, 88 insertions(+), 45 deletions(-)
create mode 100644 tools/perf/util/demangle-cxx.cpp
create mode 100644 tools/perf/util/demangle-cxx.h
diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config
index 5756498248e0..fdeca45cf15f 100644
--- a/tools/perf/Makefile.config
+++ b/tools/perf/Makefile.config
@@ -906,6 +906,7 @@ ifdef BUILD_NONDISTRO
endif
CFLAGS += -DHAVE_LIBBFD_SUPPORT
+ CXXFLAGS += -DHAVE_LIBBFD_SUPPORT
ifeq ($(feature-libbfd-buildid), 1)
CFLAGS += -DHAVE_LIBBFD_BUILDID_SUPPORT
else
@@ -913,26 +914,24 @@ ifdef BUILD_NONDISTRO
endif
endif
-ifdef NO_DEMANGLE
- CFLAGS += -DNO_DEMANGLE
-else
+ifndef NO_DEMANGLE
+ $(call feature_check,cxa-demangle)
+ ifeq ($(feature-cxa-demangle), 1)
+ EXTLIBS += -lstdc++
+ CFLAGS += -DHAVE_CXA_DEMANGLE_SUPPORT
+ CXXFLAGS += -DHAVE_CXA_DEMANGLE_SUPPORT
+ endif
ifdef BUILD_NONDISTRO
ifeq ($(filter -liberty,$(EXTLIBS)),)
- ifdef HAVE_CPLUS_DEMANGLE_SUPPORT
+ $(call feature_check,cplus-demangle)
+ ifeq ($(feature-cplus-demangle), 1)
EXTLIBS += -liberty
- else
- $(call feature_check,cplus-demangle)
- ifeq ($(feature-cplus-demangle), 1)
- EXTLIBS += -liberty
- endif
endif
endif
- endif
-
- ifneq ($(filter -liberty,$(EXTLIBS)),)
- CFLAGS += -DHAVE_CPLUS_DEMANGLE_SUPPORT
- else
- CFLAGS += -DNO_DEMANGLE
+ ifneq ($(filter -liberty,$(EXTLIBS)),)
+ CFLAGS += -DHAVE_CPLUS_DEMANGLE_SUPPORT
+ CXXFLAGS += -DHAVE_CPLUS_DEMANGLE_SUPPORT
+ endif
endif
endif
diff --git a/tools/perf/util/Build b/tools/perf/util/Build
index 918b501f9bd8..8607575183a9 100644
--- a/tools/perf/util/Build
+++ b/tools/perf/util/Build
@@ -211,6 +211,7 @@ perf-$(CONFIG_ZSTD) += zstd.o
perf-$(CONFIG_LIBCAP) += cap.o
+perf-y += demangle-cxx.o
perf-y += demangle-ocaml.o
perf-y += demangle-java.o
perf-y += demangle-rust.o
diff --git a/tools/perf/util/demangle-cxx.cpp b/tools/perf/util/demangle-cxx.cpp
new file mode 100644
index 000000000000..8708bcafd370
--- /dev/null
+++ b/tools/perf/util/demangle-cxx.cpp
@@ -0,0 +1,50 @@
+// SPDX-License-Identifier: GPL-2.0
+#include "demangle-cxx.h"
+#include <stdlib.h>
+#include <string.h>
+#include <linux/compiler.h>
+
+#ifdef HAVE_LIBBFD_SUPPORT
+#define PACKAGE 'perf'
+#include <bfd.h>
+#endif
+
+#ifdef HAVE_CXA_DEMANGLE_SUPPORT
+#include <cxxabi.h>
+#endif
+
+#if defined(HAVE_LIBBFD_SUPPORT) || defined(HAVE_CPLUS_DEMANGLE_SUPPORT)
+#ifndef DMGL_PARAMS
+#define DMGL_PARAMS (1 << 0) /* Include function args */
+#define DMGL_ANSI (1 << 1) /* Include const, volatile, etc */
+#endif
+#endif
+
+/*
+ * Demangle C++ function signature
+ *
+ * Note: caller is responsible for freeing demangled string
+ */
+extern "C"
+char *cxx_demangle_sym(const char *str, bool params __maybe_unused,
+ bool modifiers __maybe_unused)
+{
+#ifdef HAVE_LIBBFD_SUPPORT
+ int flags = (params ? DMGL_PARAMS : 0) | (modifiers ? DMGL_ANSI : 0);
+
+ return bfd_demangle(NULL, str, flags);
+#elif defined(HAVE_CPLUS_DEMANGLE_SUPPORT)
+ int flags = (params ? DMGL_PARAMS : 0) | (modifiers ? DMGL_ANSI : 0);
+
+ return cplus_demangle(str, flags);
+#elif defined(HAVE_CXA_DEMANGLE_SUPPORT)
+ size_t len = strlen(str);
+ char *output = (char*)malloc(len);
+ int status;
+
+ output = abi::__cxa_demangle(str, output, &len, &status);
+ return output;
+#else
+ return NULL;
+#endif
+}
diff --git a/tools/perf/util/demangle-cxx.h b/tools/perf/util/demangle-cxx.h
new file mode 100644
index 000000000000..26b5b66c0b4e
--- /dev/null
+++ b/tools/perf/util/demangle-cxx.h
@@ -0,0 +1,16 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __PERF_DEMANGLE_CXX
+#define __PERF_DEMANGLE_CXX 1
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+char *cxx_demangle_sym(const char *str, bool params, bool modifiers);
+
+#ifdef __cplusplus
+}
+#endif
+
+
+#endif /* __PERF_DEMANGLE_CXX */
diff --git a/tools/perf/util/symbol-elf.c b/tools/perf/util/symbol-elf.c
index 41882ae8452e..c0a2de42c51b 100644
--- a/tools/perf/util/symbol-elf.c
+++ b/tools/perf/util/symbol-elf.c
@@ -12,6 +12,7 @@
#include "maps.h"
#include "symbol.h"
#include "symsrc.h"
+#include "demangle-cxx.h"
#include "demangle-ocaml.h"
#include "demangle-java.h"
#include "demangle-rust.h"
@@ -25,6 +26,11 @@
#include <symbol/kallsyms.h>
#include <internal/lib.h>
+#ifdef HAVE_LIBBFD_SUPPORT
+#define PACKAGE 'perf'
+#include <bfd.h>
+#endif
+
#ifndef EM_AARCH64
#define EM_AARCH64 183 /* ARM 64 bit */
#endif
@@ -45,34 +51,6 @@
typedef Elf64_Nhdr GElf_Nhdr;
-#ifndef DMGL_PARAMS
-#define DMGL_NO_OPTS 0 /* For readability... */
-#define DMGL_PARAMS (1 << 0) /* Include function args */
-#define DMGL_ANSI (1 << 1) /* Include const, volatile, etc */
-#endif
-
-#ifdef HAVE_LIBBFD_SUPPORT
-#define PACKAGE 'perf'
-#include <bfd.h>
-#else
-#ifdef HAVE_CPLUS_DEMANGLE_SUPPORT
-extern char *cplus_demangle(const char *, int);
-
-static inline char *bfd_demangle(void __maybe_unused *v, const char *c, int i)
-{
- return cplus_demangle(c, i);
-}
-#else
-#ifdef NO_DEMANGLE
-static inline char *bfd_demangle(void __maybe_unused *v,
- const char __maybe_unused *c,
- int __maybe_unused i)
-{
- return NULL;
-}
-#endif
-#endif
-#endif
#ifndef HAVE_ELF_GETPHDRNUM_SUPPORT
static int elf_getphdrnum(Elf *elf, size_t *dst)
@@ -295,7 +273,6 @@ static bool want_demangle(bool is_kernel_sym)
static char *demangle_sym(struct dso *dso, int kmodule, const char *elf_name)
{
- int demangle_flags = verbose > 0 ? (DMGL_PARAMS | DMGL_ANSI) : DMGL_NO_OPTS;
char *demangled = NULL;
/*
@@ -306,7 +283,7 @@ static char *demangle_sym(struct dso *dso, int kmodule, const char *elf_name)
if (!want_demangle(dso->kernel || kmodule))
return demangled;
- demangled = bfd_demangle(NULL, elf_name, demangle_flags);
+ demangled = cxx_demangle_sym(elf_name, verbose > 0, verbose > 0);
if (demangled == NULL) {
demangled = ocaml_demangle_sym(elf_name);
if (demangled == NULL) {
--
2.40.0.rc1.284.g88254d51c5-goog
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