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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@google.com> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Andres Freund <andres@anarazel.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Leo Yan <leo.yan@linaro.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Martin Liška <mliska@suse.cz> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Nathan Chancellor <nathan@kernel.org> Cc: Nick Desaulniers <ndesaulniers@google.com> Cc: Pavithra Gurushankar <gpavithrasha@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Quentin Monnet <quentin@isovalent.com> Cc: Roberto Sassu <roberto.sassu@huawei.com> Cc: Stephane Eranian <eranian@google.com> Cc: Tiezhu Yang <yangtiezhu@loongson.cn> Cc: Tom Rix <trix@redhat.com> Cc: Yang Jihong <yangjihong1@huawei.com> Cc: llvm@lists.linux.dev Link: https://lore.kernel.org/r/20230311065753.3012826-2-irogers@google.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Ian Rogers
Arnaldo Carvalho de Melo
parent
4c72e2b35a
commit
3b4e4efe88
@ -914,6 +914,7 @@ ifdef BUILD_NONDISTRO
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endif
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CFLAGS += -DHAVE_LIBBFD_SUPPORT
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CXXFLAGS += -DHAVE_LIBBFD_SUPPORT
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ifeq ($(feature-libbfd-buildid), 1)
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CFLAGS += -DHAVE_LIBBFD_BUILDID_SUPPORT
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else
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@ -921,26 +922,24 @@ ifdef BUILD_NONDISTRO
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endif
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endif
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ifdef NO_DEMANGLE
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CFLAGS += -DNO_DEMANGLE
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else
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ifndef NO_DEMANGLE
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$(call feature_check,cxa-demangle)
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ifeq ($(feature-cxa-demangle), 1)
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EXTLIBS += -lstdc++
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CFLAGS += -DHAVE_CXA_DEMANGLE_SUPPORT
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CXXFLAGS += -DHAVE_CXA_DEMANGLE_SUPPORT
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endif
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ifdef BUILD_NONDISTRO
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ifeq ($(filter -liberty,$(EXTLIBS)),)
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ifdef HAVE_CPLUS_DEMANGLE_SUPPORT
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$(call feature_check,cplus-demangle)
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ifeq ($(feature-cplus-demangle), 1)
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EXTLIBS += -liberty
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else
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$(call feature_check,cplus-demangle)
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ifeq ($(feature-cplus-demangle), 1)
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EXTLIBS += -liberty
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endif
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endif
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endif
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endif
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ifneq ($(filter -liberty,$(EXTLIBS)),)
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CFLAGS += -DHAVE_CPLUS_DEMANGLE_SUPPORT
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else
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CFLAGS += -DNO_DEMANGLE
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ifneq ($(filter -liberty,$(EXTLIBS)),)
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CFLAGS += -DHAVE_CPLUS_DEMANGLE_SUPPORT
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CXXFLAGS += -DHAVE_CPLUS_DEMANGLE_SUPPORT
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endif
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endif
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endif
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@ -211,6 +211,7 @@ perf-$(CONFIG_ZSTD) += zstd.o
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perf-$(CONFIG_LIBCAP) += cap.o
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perf-y += demangle-cxx.o
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perf-y += demangle-ocaml.o
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perf-y += demangle-java.o
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perf-y += demangle-rust.o
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50
tools/perf/util/demangle-cxx.cpp
Normal file
50
tools/perf/util/demangle-cxx.cpp
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@ -0,0 +1,50 @@
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// SPDX-License-Identifier: GPL-2.0
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#include "demangle-cxx.h"
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#include <stdlib.h>
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#include <string.h>
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#include <linux/compiler.h>
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#ifdef HAVE_LIBBFD_SUPPORT
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#define PACKAGE 'perf'
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#include <bfd.h>
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#endif
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#ifdef HAVE_CXA_DEMANGLE_SUPPORT
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#include <cxxabi.h>
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#endif
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#if defined(HAVE_LIBBFD_SUPPORT) || defined(HAVE_CPLUS_DEMANGLE_SUPPORT)
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#ifndef DMGL_PARAMS
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#define DMGL_PARAMS (1 << 0) /* Include function args */
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#define DMGL_ANSI (1 << 1) /* Include const, volatile, etc */
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#endif
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#endif
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/*
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* Demangle C++ function signature
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*
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* Note: caller is responsible for freeing demangled string
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*/
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extern "C"
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char *cxx_demangle_sym(const char *str, bool params __maybe_unused,
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bool modifiers __maybe_unused)
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{
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#ifdef HAVE_LIBBFD_SUPPORT
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int flags = (params ? DMGL_PARAMS : 0) | (modifiers ? DMGL_ANSI : 0);
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return bfd_demangle(NULL, str, flags);
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#elif defined(HAVE_CPLUS_DEMANGLE_SUPPORT)
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int flags = (params ? DMGL_PARAMS : 0) | (modifiers ? DMGL_ANSI : 0);
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return cplus_demangle(str, flags);
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#elif defined(HAVE_CXA_DEMANGLE_SUPPORT)
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size_t len = strlen(str);
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char *output = (char*)malloc(len);
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int status;
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output = abi::__cxa_demangle(str, output, &len, &status);
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return output;
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#else
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return NULL;
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#endif
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}
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16
tools/perf/util/demangle-cxx.h
Normal file
16
tools/perf/util/demangle-cxx.h
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@ -0,0 +1,16 @@
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __PERF_DEMANGLE_CXX
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#define __PERF_DEMANGLE_CXX 1
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#ifdef __cplusplus
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extern "C" {
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#endif
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char *cxx_demangle_sym(const char *str, bool params, bool modifiers);
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#ifdef __cplusplus
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}
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#endif
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#endif /* __PERF_DEMANGLE_CXX */
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@ -12,6 +12,7 @@
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#include "maps.h"
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#include "symbol.h"
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#include "symsrc.h"
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#include "demangle-cxx.h"
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#include "demangle-ocaml.h"
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#include "demangle-java.h"
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#include "demangle-rust.h"
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@ -25,6 +26,11 @@
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#include <symbol/kallsyms.h>
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#include <internal/lib.h>
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#ifdef HAVE_LIBBFD_SUPPORT
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#define PACKAGE 'perf'
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#include <bfd.h>
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#endif
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#ifndef EM_AARCH64
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#define EM_AARCH64 183 /* ARM 64 bit */
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#endif
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@ -45,34 +51,6 @@
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typedef Elf64_Nhdr GElf_Nhdr;
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#ifndef DMGL_PARAMS
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#define DMGL_NO_OPTS 0 /* For readability... */
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#define DMGL_PARAMS (1 << 0) /* Include function args */
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#define DMGL_ANSI (1 << 1) /* Include const, volatile, etc */
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#endif
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#ifdef HAVE_LIBBFD_SUPPORT
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#define PACKAGE 'perf'
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#include <bfd.h>
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#else
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#ifdef HAVE_CPLUS_DEMANGLE_SUPPORT
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extern char *cplus_demangle(const char *, int);
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static inline char *bfd_demangle(void __maybe_unused *v, const char *c, int i)
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{
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return cplus_demangle(c, i);
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}
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#else
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#ifdef NO_DEMANGLE
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static inline char *bfd_demangle(void __maybe_unused *v,
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const char __maybe_unused *c,
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int __maybe_unused i)
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{
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return NULL;
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}
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#endif
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#endif
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#endif
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#ifndef HAVE_ELF_GETPHDRNUM_SUPPORT
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static int elf_getphdrnum(Elf *elf, size_t *dst)
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@ -295,7 +273,6 @@ static bool want_demangle(bool is_kernel_sym)
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static char *demangle_sym(struct dso *dso, int kmodule, const char *elf_name)
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{
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int demangle_flags = verbose > 0 ? (DMGL_PARAMS | DMGL_ANSI) : DMGL_NO_OPTS;
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char *demangled = NULL;
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/*
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@ -306,7 +283,7 @@ static char *demangle_sym(struct dso *dso, int kmodule, const char *elf_name)
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if (!want_demangle(dso->kernel || kmodule))
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return demangled;
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demangled = bfd_demangle(NULL, elf_name, demangle_flags);
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demangled = cxx_demangle_sym(elf_name, verbose > 0, verbose > 0);
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if (demangled == NULL) {
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demangled = ocaml_demangle_sym(elf_name);
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if (demangled == NULL) {
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