From patchwork Fri Feb 16 23:54:10 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Namhyung Kim X-Patchwork-Id: 13560919 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0F5D2148FFF; Fri, 16 Feb 2024 23:54:25 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708127666; cv=none; b=sSfOLrH/Q3vWR6FE3Ej63oSZ2Pnpkhgv9iU7ZOXQcgr4K9RL17gzTTE4vo1hb5BpdlPahCdu/nKdHskEU51fcEoNvlo5oyuVMAVv1isEp3ZVKxU3a6rP1l3c5hAWchoxs058/uWrOMw1SDTORS6bo6UXQ5+jJ3TnscpSleJ4yl4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708127666; c=relaxed/simple; bh=Qw5in8yXru6XDR/MkCtSi5udF5OsSGUvfaaiz1BQ/Vc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=CpsXbPZG4elA9E0BSn+0Iaxmh+S3FO6MLvIJQkn9q1fivkFGqQ6rOoMk3NkSPAZrZOSjBizdNhxL4264pHcPNERtzA5oWifWxfNIVsItgc5bHvbbdO+JDd5QfH7X+RohpmA+zVKC7L27e8CMPMnJ1wcWkfX1/QcyzXDCLhk3H14= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=lrFcSa2m; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="lrFcSa2m" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2151BC433C7; Fri, 16 Feb 2024 23:54:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1708127665; bh=Qw5in8yXru6XDR/MkCtSi5udF5OsSGUvfaaiz1BQ/Vc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=lrFcSa2mRpoWSX/v9+yZiSyZX8U54mmS1u1B7ANszJyVkrCyL0oxTOXL0Vu94WFqT QYm4QgDfKMlQ3UPjrHvUCtRN2dmb8tQgha8RkZ/8PXUnMm6113IP7ZRtg+1ewWqDY/ Nb0OsPevP437xNFMXGlOQ5CV6ksbYFw80KPnOzNL+RpnxmlVhnsQvRHs0BS+qLy14v jFXjLF+R1omwAtzj+MHh1nV5lEdncpiJP8ZepuNhipnnvi37Al2HElIP9YalSxDdjb 6B4cqH5ung2S5x5pdMf2G8eFi5NRF4dw+g7o0af8+EeIm8vDImvAGQ7SLWGE/Jf5ve 7jOnr+a7lTTaA== From: Namhyung Kim To: Arnaldo Carvalho de Melo , Ian Rogers Cc: Jiri Olsa , Adrian Hunter , Peter Zijlstra , Ingo Molnar , LKML , linux-perf-users@vger.kernel.org, Linus Torvalds , Stephane Eranian , Masami Hiramatsu , linux-toolchains@vger.kernel.org, linux-trace-devel@vger.kernel.org Subject: [PATCH 01/14] perf dwarf-aux: Add die_collect_vars() Date: Fri, 16 Feb 2024 15:54:10 -0800 Message-ID: <20240216235423.2343167-2-namhyung@kernel.org> X-Mailer: git-send-email 2.44.0.rc0.258.g7320e95886-goog In-Reply-To: <20240216235423.2343167-1-namhyung@kernel.org> References: <20240216235423.2343167-1-namhyung@kernel.org> Precedence: bulk X-Mailing-List: linux-trace-devel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 The die_collect_vars() is to find all variable information in the scope including function parameters. The struct die_var_type is to save the type of the variable with the location (reg and offset) as well as where it's defined in the code (addr). Acked-by: Masami Hiramatsu (Google) Signed-off-by: Namhyung Kim --- tools/perf/util/dwarf-aux.c | 118 +++++++++++++++++++++++++++--------- tools/perf/util/dwarf-aux.h | 17 ++++++ 2 files changed, 107 insertions(+), 28 deletions(-) diff --git a/tools/perf/util/dwarf-aux.c b/tools/perf/util/dwarf-aux.c index 2791126069b4..f878014c9e27 100644 --- a/tools/perf/util/dwarf-aux.c +++ b/tools/perf/util/dwarf-aux.c @@ -1136,6 +1136,40 @@ int die_get_varname(Dwarf_Die *vr_die, struct strbuf *buf) return ret < 0 ? ret : strbuf_addf(buf, "\t%s", dwarf_diename(vr_die)); } +#if defined(HAVE_DWARF_GETLOCATIONS_SUPPORT) || defined(HAVE_DWARF_CFI_SUPPORT) +static int reg_from_dwarf_op(Dwarf_Op *op) +{ + switch (op->atom) { + case DW_OP_reg0 ... DW_OP_reg31: + return op->atom - DW_OP_reg0; + case DW_OP_breg0 ... DW_OP_breg31: + return op->atom - DW_OP_breg0; + case DW_OP_regx: + case DW_OP_bregx: + return op->number; + default: + break; + } + return -1; +} + +static int offset_from_dwarf_op(Dwarf_Op *op) +{ + switch (op->atom) { + case DW_OP_reg0 ... DW_OP_reg31: + case DW_OP_regx: + return 0; + case DW_OP_breg0 ... DW_OP_breg31: + return op->number; + case DW_OP_bregx: + return op->number2; + default: + break; + } + return -1; +} +#endif /* HAVE_DWARF_GETLOCATIONS_SUPPORT || HAVE_DWARF_CFI_SUPPORT */ + #ifdef HAVE_DWARF_GETLOCATIONS_SUPPORT /** * die_get_var_innermost_scope - Get innermost scope range of given variable DIE @@ -1479,41 +1513,69 @@ Dwarf_Die *die_find_variable_by_addr(Dwarf_Die *sc_die, Dwarf_Addr pc, *offset = data.offset; return result; } -#endif /* HAVE_DWARF_GETLOCATIONS_SUPPORT */ -#ifdef HAVE_DWARF_CFI_SUPPORT -static int reg_from_dwarf_op(Dwarf_Op *op) +static int __die_collect_vars_cb(Dwarf_Die *die_mem, void *arg) { - switch (op->atom) { - case DW_OP_reg0 ... DW_OP_reg31: - return op->atom - DW_OP_reg0; - case DW_OP_breg0 ... DW_OP_breg31: - return op->atom - DW_OP_breg0; - case DW_OP_regx: - case DW_OP_bregx: - return op->number; - default: - break; - } - return -1; + struct die_var_type **var_types = arg; + Dwarf_Die type_die; + int tag = dwarf_tag(die_mem); + Dwarf_Attribute attr; + Dwarf_Addr base, start, end; + Dwarf_Op *ops; + size_t nops; + struct die_var_type *vt; + + if (tag != DW_TAG_variable && tag != DW_TAG_formal_parameter) + return DIE_FIND_CB_SIBLING; + + if (dwarf_attr(die_mem, DW_AT_location, &attr) == NULL) + return DIE_FIND_CB_SIBLING; + + /* + * Only collect the first location as it can reconstruct the + * remaining state by following the instructions. + * start = 0 means it covers the whole range. + */ + if (dwarf_getlocations(&attr, 0, &base, &start, &end, &ops, &nops) <= 0) + return DIE_FIND_CB_SIBLING; + + if (die_get_real_type(die_mem, &type_die) == NULL) + return DIE_FIND_CB_SIBLING; + + vt = malloc(sizeof(*vt)); + if (vt == NULL) + return DIE_FIND_CB_END; + + vt->die_off = dwarf_dieoffset(&type_die); + vt->addr = start; + vt->reg = reg_from_dwarf_op(ops); + vt->offset = offset_from_dwarf_op(ops); + vt->next = *var_types; + *var_types = vt; + + return DIE_FIND_CB_SIBLING; } -static int offset_from_dwarf_op(Dwarf_Op *op) +/** + * die_collect_vars - Save all variables and parameters + * @sc_die: a scope DIE + * @var_types: a pointer to save the resulting list + * + * Save all variables and parameters in the @sc_die and save them to @var_types. + * The @var_types is a singly-linked list containing type and location info. + * Actual type can be retrieved using dwarf_offdie() with 'die_off' later. + * + * Callers should free @var_types. + */ +void die_collect_vars(Dwarf_Die *sc_die, struct die_var_type **var_types) { - switch (op->atom) { - case DW_OP_reg0 ... DW_OP_reg31: - case DW_OP_regx: - return 0; - case DW_OP_breg0 ... DW_OP_breg31: - return op->number; - case DW_OP_bregx: - return op->number2; - default: - break; - } - return -1; + Dwarf_Die die_mem; + + die_find_child(sc_die, __die_collect_vars_cb, (void *)var_types, &die_mem); } +#endif /* HAVE_DWARF_GETLOCATIONS_SUPPORT */ +#ifdef HAVE_DWARF_CFI_SUPPORT /** * die_get_cfa - Get frame base information * @dwarf: a Dwarf info diff --git a/tools/perf/util/dwarf-aux.h b/tools/perf/util/dwarf-aux.h index 85dd527ae1f7..efafd3a1f5b6 100644 --- a/tools/perf/util/dwarf-aux.h +++ b/tools/perf/util/dwarf-aux.h @@ -135,6 +135,15 @@ void die_skip_prologue(Dwarf_Die *sp_die, Dwarf_Die *cu_die, /* Get the list of including scopes */ int die_get_scopes(Dwarf_Die *cu_die, Dwarf_Addr pc, Dwarf_Die **scopes); +/* Variable type information */ +struct die_var_type { + struct die_var_type *next; + u64 die_off; + u64 addr; + int reg; + int offset; +}; + #ifdef HAVE_DWARF_GETLOCATIONS_SUPPORT /* Get byte offset range of given variable DIE */ @@ -150,6 +159,9 @@ Dwarf_Die *die_find_variable_by_addr(Dwarf_Die *sc_die, Dwarf_Addr pc, Dwarf_Addr addr, Dwarf_Die *die_mem, int *offset); +/* Save all variables and parameters in this scope */ +void die_collect_vars(Dwarf_Die *sc_die, struct die_var_type **var_types); + #else /* HAVE_DWARF_GETLOCATIONS_SUPPORT */ static inline int die_get_var_range(Dwarf_Die *sp_die __maybe_unused, @@ -178,6 +190,11 @@ static inline Dwarf_Die *die_find_variable_by_addr(Dwarf_Die *sc_die __maybe_unu return NULL; } +static inline void die_collect_vars(Dwarf_Die *sc_die __maybe_unused, + struct die_var_type **var_types __maybe_unused) +{ +} + #endif /* HAVE_DWARF_GETLOCATIONS_SUPPORT */ #ifdef HAVE_DWARF_CFI_SUPPORT