From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pf1-f172.google.com (mail-pf1-f172.google.com [209.85.210.172]) (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 AA701332EA7 for ; Mon, 17 Nov 2025 13:26:37 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.172 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763385999; cv=none; b=MFNjmNkZbWzS+SQfG0h/AK1M2he/85CAmaGGI3cyJSgcMsm+gQWDE4EvBhtQONnjT6+6A1Er3sx5hjQYEwrDoI/ZCzR+XXDtHesgl6ieJCYySVSuqeSTo6eA88IbotZpiYc8+2ZKk8/hPsg8SF0jTx97zSHFIwEhC2ziIgUHIVE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763385999; c=relaxed/simple; bh=fKl3CjkwUAvLf00MO5NwlJbM77gTj4jLjJopoNuYY3k=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=WPRSL+MBHd0uGClfCnGQnUJM4kQ3syhZOtOcv55ZMxJ6oe1gaA84JVVkSyNDhUP0/yMtljZ7Bc6ugD3qD3MejDudmXEd99D/T+70TkNJx/kBWcSptoQtK3RAWZxQUfyk7D0m3h6NsPurEV1RM5jllB19lRpM8X4CpqYB/AkX71s= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=RTwk0+Zo; arc=none smtp.client-ip=209.85.210.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="RTwk0+Zo" Received: by mail-pf1-f172.google.com with SMTP id d2e1a72fcca58-7baf61be569so2615605b3a.3 for ; Mon, 17 Nov 2025 05:26:37 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1763385997; x=1763990797; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=KIFYlXOHz5whi3PfXinpEu8mupdZxU5ceyDILBZSC4o=; b=RTwk0+ZoTLLyy1LznHpukZKWcKj5E5vrIt9ohyGzNFE/NcRYrP4P8n5NpNBvMkIMYi ZqVsT9nygAzy/XKlYOS0dBbLEEXk5QK0eHIudd/vuQR1rz3mk2ksMFauyWu5MFPnDj6F bm+z5pwVMdUvXN+5F6kmvvMsG5Rj6Kgx9dXufrxIhU2U3/0tbmzrgTZe7TwlXy8jciRr XpEz+k6a8pLiEj+qXVXqV2rbjHSln9dEI+Bwlugtouo4gfZN2WH1+UnAO6HJ68ED7N69 d//FFPkO5U7J9qoz71joLfUXkx1jDKZ39ca8bQdUKKtKWEvdgQ9ccfEuv0nV78YBnhKV SrOA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1763385997; x=1763990797; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to; bh=KIFYlXOHz5whi3PfXinpEu8mupdZxU5ceyDILBZSC4o=; b=YfB622iA4/s8ONB+RkAOdusYaSrjAqur4SC9GQApCHYSEOnE2KTTLhwusNkfc9TlTO 151PuGaP+WaxpseaVDfrvSWAPoZN8gzk3j92exPKKGtgctt/P6SPkm3I44ZniOP9yQC9 /2cl7Slyf5I1n4DzQxjAt8GRduSjuM5WM1e47ORrNtvUSlYh9JP62crmxTapc/zN92WP u8oFYEarudY4RjV3se6PFCJQqVzY10w2LsM2OKmv+DE0/1ISuu3I79wgNY6h7Uak61yE ZjCw7XJ+PwCNieib1YQzDShfowYceqGFW/7VDo1zSb1bw43YXoSZ4dRKn3wPz0lwolQD VcPA== X-Forwarded-Encrypted: i=1; AJvYcCWGJgrAcdWM4vsUUbn5NK4M0q6XTwq9KGfEAGtsSZLtNm3BukrSvMGwMJqhnGsG8LcVTPU=@vger.kernel.org X-Gm-Message-State: AOJu0YxOj+aUCExldA8LAKF5oqJk30CUi4SG4JVO4Hi1eV28qh8Uxw60 Bk6SCG9CITwY7TX13kHyEzhY6dQCKObIA+lE+iad1uc5bhQAe+TO4817 X-Gm-Gg: ASbGncu59lxHlTkyiqPk7UOuOzGPHuZYDDqxhYg76rDWUIFca9wefPusYetHUx4Q2Sv xLC+myBNqnWY1bu0FhFp0vcCvlhdYnlvT0FSmIM0zXK3kXPI38Zd11zMjHwleHzbzEmuB75VFiC d+I7890yMMuoERBmoJhhX2txLDLpTJWikZvGgbv8XWcgIUxRyP1GCHtAiAz/AvC3VYNOyN1po9T OUCxukFMRCTR9nDSTZTREYvkmXtzy835QjQGAOYhYX0bi93k8yq4zeWNxslKzeZd1nRd28DwF7B 4KxPaziZw01okevPlx22iO+UFdYnsvrH+dA9Qk34hanPT0oEHI53oOJvgo2yj3noKFNl6qAnfQ0 BIiPlGF014mF4iKX7sGpVJ5B9OlDM3vfToiUfQ/qnCg82HOOffHBUWEk7s549fiJ2HEI54BrlBf q/+TsECCluORj7QZES X-Google-Smtp-Source: AGHT+IHdTnYzPJpDm8dxpyzjmpKTz4z28CIouriXEG9ikH1xw0E4XaaZizSOWoHVGZw2NDZ+1IEN2g== X-Received: by 2002:a05:6a00:2194:b0:7a4:1880:e25e with SMTP id d2e1a72fcca58-7ba3ca60000mr13431081b3a.30.1763385996792; Mon, 17 Nov 2025 05:26:36 -0800 (PST) Received: from pengdl-pc.mioffice.cn ([43.224.245.249]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-7b924cd89bcsm13220953b3a.15.2025.11.17.05.26.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 17 Nov 2025 05:26:35 -0800 (PST) From: Donglin Peng To: ast@kernel.org Cc: eddyz87@gmail.com, andrii.nakryiko@gmail.com, zhangxiaoqin@xiaomi.com, linux-kernel@vger.kernel.org, bpf@vger.kernel.org, Donglin Peng , Alan Maguire , Song Liu Subject: [RFC PATCH v6 2/7] selftests/bpf: Add test cases for btf__permute functionality Date: Mon, 17 Nov 2025 21:26:18 +0800 Message-Id: <20251117132623.3807094-3-dolinux.peng@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20251117132623.3807094-1-dolinux.peng@gmail.com> References: <20251117132623.3807094-1-dolinux.peng@gmail.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Donglin Peng This patch introduces test cases for the btf__permute function to ensure it works correctly with both base BTF and split BTF scenarios. The test suite includes: - test_permute_base: Validates permutation on base BTF - test_permute_split: Tests permutation on split BTF - test_permute_drop_base: Validates type dropping on base BTF - test_permute_drop_split: Tests type dropping on split BTF - test_permute_drop_dedup: Tests type dropping and deduping Cc: Eduard Zingerman Cc: Alexei Starovoitov Cc: Andrii Nakryiko Cc: Alan Maguire Cc: Song Liu Cc: Xiaoqin Zhang Signed-off-by: Donglin Peng --- .../selftests/bpf/prog_tests/btf_permute.c | 632 ++++++++++++++++++ 1 file changed, 632 insertions(+) create mode 100644 tools/testing/selftests/bpf/prog_tests/btf_permute.c diff --git a/tools/testing/selftests/bpf/prog_tests/btf_permute.c b/tools/testing/selftests/bpf/prog_tests/btf_permute.c new file mode 100644 index 000000000000..fccbf3744e5e --- /dev/null +++ b/tools/testing/selftests/bpf/prog_tests/btf_permute.c @@ -0,0 +1,632 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) 2025 Xiaomi */ + +#include +#include +#include "btf_helpers.h" + +/* Ensure btf__permute work as expected with base BTF */ +static void test_permute_base(void) +{ + struct btf *btf; + __u32 permute_ids[7]; + int err; + + btf = btf__new_empty(); + if (!ASSERT_OK_PTR(btf, "empty_main_btf")) + return; + + btf__add_int(btf, "int", 4, BTF_INT_SIGNED); /* [1] int */ + btf__add_ptr(btf, 1); /* [2] ptr to int */ + btf__add_struct(btf, "s1", 4); /* [3] struct s1 { */ + btf__add_field(btf, "m", 1, 0, 0); /* int m; */ + /* } */ + btf__add_struct(btf, "s2", 4); /* [4] struct s2 { */ + btf__add_field(btf, "m", 1, 0, 0); /* int m; */ + /* } */ + btf__add_func_proto(btf, 1); /* [5] int (*)(int *p); */ + btf__add_func_param(btf, "p", 2); + btf__add_func(btf, "f", BTF_FUNC_STATIC, 5); /* [6] int f(int *p); */ + + VALIDATE_RAW_BTF( + btf, + "[1] INT 'int' size=4 bits_offset=0 nr_bits=32 encoding=SIGNED", + "[2] PTR '(anon)' type_id=1", + "[3] STRUCT 's1' size=4 vlen=1\n" + "\t'm' type_id=1 bits_offset=0", + "[4] STRUCT 's2' size=4 vlen=1\n" + "\t'm' type_id=1 bits_offset=0", + "[5] FUNC_PROTO '(anon)' ret_type_id=1 vlen=1\n" + "\t'p' type_id=2", + "[6] FUNC 'f' type_id=5 linkage=static"); + + permute_ids[0] = 0; + permute_ids[1] = 4; /* [1] -> [4] */ + permute_ids[2] = 3; /* [2] -> [3] */ + permute_ids[3] = 5; /* [3] -> [5] */ + permute_ids[4] = 1; /* [4] -> [1] */ + permute_ids[5] = 6; /* [5] -> [6] */ + permute_ids[6] = 2; /* [6] -> [2] */ + err = btf__permute(btf, permute_ids, ARRAY_SIZE(permute_ids), NULL); + if (!ASSERT_OK(err, "btf__permute_base")) + goto done; + + VALIDATE_RAW_BTF( + btf, + "[1] STRUCT 's2' size=4 vlen=1\n" + "\t'm' type_id=4 bits_offset=0", + "[2] FUNC 'f' type_id=6 linkage=static", + "[3] PTR '(anon)' type_id=4", + "[4] INT 'int' size=4 bits_offset=0 nr_bits=32 encoding=SIGNED", + "[5] STRUCT 's1' size=4 vlen=1\n" + "\t'm' type_id=4 bits_offset=0", + "[6] FUNC_PROTO '(anon)' ret_type_id=4 vlen=1\n" + "\t'p' type_id=3"); + + /* For base BTF, id_map[0] must be 0 */ + permute_ids[0] = 4; + permute_ids[1] = 0; + permute_ids[2] = 3; + permute_ids[3] = 5; + permute_ids[4] = 1; + permute_ids[5] = 6; + permute_ids[6] = 2; + err = btf__permute(btf, permute_ids, ARRAY_SIZE(permute_ids), NULL); + if (!ASSERT_ERR(err, "btf__permute_base")) + goto done; + + VALIDATE_RAW_BTF( + btf, + "[1] STRUCT 's2' size=4 vlen=1\n" + "\t'm' type_id=4 bits_offset=0", + "[2] FUNC 'f' type_id=6 linkage=static", + "[3] PTR '(anon)' type_id=4", + "[4] INT 'int' size=4 bits_offset=0 nr_bits=32 encoding=SIGNED", + "[5] STRUCT 's1' size=4 vlen=1\n" + "\t'm' type_id=4 bits_offset=0", + "[6] FUNC_PROTO '(anon)' ret_type_id=4 vlen=1\n" + "\t'p' type_id=3"); + + /* + * For base BTF, id_map_cnt must equal to the number of types + * include VOID type + */ + permute_ids[0] = 4; + permute_ids[1] = 0; + permute_ids[2] = 3; + permute_ids[3] = 5; + permute_ids[4] = 1; + permute_ids[5] = 6; + err = btf__permute(btf, permute_ids, ARRAY_SIZE(permute_ids) - 1, NULL); + if (!ASSERT_ERR(err, "btf__permute_base")) + goto done; + + VALIDATE_RAW_BTF( + btf, + "[1] STRUCT 's2' size=4 vlen=1\n" + "\t'm' type_id=4 bits_offset=0", + "[2] FUNC 'f' type_id=6 linkage=static", + "[3] PTR '(anon)' type_id=4", + "[4] INT 'int' size=4 bits_offset=0 nr_bits=32 encoding=SIGNED", + "[5] STRUCT 's1' size=4 vlen=1\n" + "\t'm' type_id=4 bits_offset=0", + "[6] FUNC_PROTO '(anon)' ret_type_id=4 vlen=1\n" + "\t'p' type_id=3"); + + /* Multiple types can not be mapped to the same ID */ + permute_ids[0] = 0; + permute_ids[1] = 4; + permute_ids[2] = 4; + permute_ids[3] = 5; + permute_ids[4] = 1; + permute_ids[5] = 6; + permute_ids[6] = 2; + err = btf__permute(btf, permute_ids, ARRAY_SIZE(permute_ids), NULL); + if (!ASSERT_ERR(err, "btf__permute_base")) + goto done; + + VALIDATE_RAW_BTF( + btf, + "[1] STRUCT 's2' size=4 vlen=1\n" + "\t'm' type_id=4 bits_offset=0", + "[2] FUNC 'f' type_id=6 linkage=static", + "[3] PTR '(anon)' type_id=4", + "[4] INT 'int' size=4 bits_offset=0 nr_bits=32 encoding=SIGNED", + "[5] STRUCT 's1' size=4 vlen=1\n" + "\t'm' type_id=4 bits_offset=0", + "[6] FUNC_PROTO '(anon)' ret_type_id=4 vlen=1\n" + "\t'p' type_id=3"); + + /* Type ID must be valid */ + permute_ids[0] = 0; + permute_ids[1] = 4; + permute_ids[2] = 3; + permute_ids[3] = 5; + permute_ids[4] = 1; + permute_ids[5] = 7; + permute_ids[6] = 2; + err = btf__permute(btf, permute_ids, ARRAY_SIZE(permute_ids), NULL); + if (!ASSERT_ERR(err, "btf__permute_base")) + goto done; + + VALIDATE_RAW_BTF( + btf, + "[1] STRUCT 's2' size=4 vlen=1\n" + "\t'm' type_id=4 bits_offset=0", + "[2] FUNC 'f' type_id=6 linkage=static", + "[3] PTR '(anon)' type_id=4", + "[4] INT 'int' size=4 bits_offset=0 nr_bits=32 encoding=SIGNED", + "[5] STRUCT 's1' size=4 vlen=1\n" + "\t'm' type_id=4 bits_offset=0", + "[6] FUNC_PROTO '(anon)' ret_type_id=4 vlen=1\n" + "\t'p' type_id=3"); + +done: + btf__free(btf); +} + +/* Ensure btf__permute work as expected with split BTF */ +static void test_permute_split(void) +{ + struct btf *split_btf = NULL, *base_btf = NULL; + __u32 permute_ids[4]; + int err; + + base_btf = btf__new_empty(); + if (!ASSERT_OK_PTR(base_btf, "empty_main_btf")) + return; + + btf__add_int(base_btf, "int", 4, BTF_INT_SIGNED); /* [1] int */ + btf__add_ptr(base_btf, 1); /* [2] ptr to int */ + VALIDATE_RAW_BTF( + base_btf, + "[1] INT 'int' size=4 bits_offset=0 nr_bits=32 encoding=SIGNED", + "[2] PTR '(anon)' type_id=1"); + split_btf = btf__new_empty_split(base_btf); + if (!ASSERT_OK_PTR(split_btf, "empty_split_btf")) + goto cleanup; + btf__add_struct(split_btf, "s1", 4); /* [3] struct s1 { */ + btf__add_field(split_btf, "m", 1, 0, 0); /* int m; */ + /* } */ + btf__add_struct(split_btf, "s2", 4); /* [4] struct s2 { */ + btf__add_field(split_btf, "m", 1, 0, 0); /* int m; */ + /* } */ + btf__add_func_proto(split_btf, 1); /* [5] int (*)(int p); */ + btf__add_func_param(split_btf, "p", 2); + btf__add_func(split_btf, "f", BTF_FUNC_STATIC, 5); /* [6] int f(int *p); */ + + VALIDATE_RAW_BTF( + split_btf, + "[1] INT 'int' size=4 bits_offset=0 nr_bits=32 encoding=SIGNED", + "[2] PTR '(anon)' type_id=1", + "[3] STRUCT 's1' size=4 vlen=1\n" + "\t'm' type_id=1 bits_offset=0", + "[4] STRUCT 's2' size=4 vlen=1\n" + "\t'm' type_id=1 bits_offset=0", + "[5] FUNC_PROTO '(anon)' ret_type_id=1 vlen=1\n" + "\t'p' type_id=2", + "[6] FUNC 'f' type_id=5 linkage=static"); + + permute_ids[0] = 6; /* [3] -> [6] */ + permute_ids[1] = 3; /* [4] -> [3] */ + permute_ids[2] = 5; /* [5] -> [5] */ + permute_ids[3] = 4; /* [6] -> [4] */ + err = btf__permute(split_btf, permute_ids, ARRAY_SIZE(permute_ids), NULL); + if (!ASSERT_OK(err, "btf__permute_split")) + goto cleanup; + + VALIDATE_RAW_BTF( + split_btf, + "[1] INT 'int' size=4 bits_offset=0 nr_bits=32 encoding=SIGNED", + "[2] PTR '(anon)' type_id=1", + "[3] STRUCT 's2' size=4 vlen=1\n" + "\t'm' type_id=1 bits_offset=0", + "[4] FUNC 'f' type_id=5 linkage=static", + "[5] FUNC_PROTO '(anon)' ret_type_id=1 vlen=1\n" + "\t'p' type_id=2", + "[6] STRUCT 's1' size=4 vlen=1\n" + "\t'm' type_id=1 bits_offset=0"); + + /* + * For split BTF, id_map_cnt must equal to the number of types + * added on top of base BTF + */ + permute_ids[0] = 4; + permute_ids[1] = 3; + permute_ids[2] = 5; + permute_ids[3] = 6; + err = btf__permute(split_btf, permute_ids, 3, NULL); + if (!ASSERT_ERR(err, "btf__permute_split")) + goto cleanup; + + VALIDATE_RAW_BTF( + split_btf, + "[1] INT 'int' size=4 bits_offset=0 nr_bits=32 encoding=SIGNED", + "[2] PTR '(anon)' type_id=1", + "[3] STRUCT 's2' size=4 vlen=1\n" + "\t'm' type_id=1 bits_offset=0", + "[4] FUNC 'f' type_id=5 linkage=static", + "[5] FUNC_PROTO '(anon)' ret_type_id=1 vlen=1\n" + "\t'p' type_id=2", + "[6] STRUCT 's1' size=4 vlen=1\n" + "\t'm' type_id=1 bits_offset=0"); + + /* Multiple types can not be mapped to the same ID */ + permute_ids[0] = 4; + permute_ids[1] = 3; + permute_ids[2] = 3; + permute_ids[3] = 6; + err = btf__permute(split_btf, permute_ids, 4, NULL); + if (!ASSERT_ERR(err, "btf__permute_split")) + goto cleanup; + + VALIDATE_RAW_BTF( + split_btf, + "[1] INT 'int' size=4 bits_offset=0 nr_bits=32 encoding=SIGNED", + "[2] PTR '(anon)' type_id=1", + "[3] STRUCT 's2' size=4 vlen=1\n" + "\t'm' type_id=1 bits_offset=0", + "[4] FUNC 'f' type_id=5 linkage=static", + "[5] FUNC_PROTO '(anon)' ret_type_id=1 vlen=1\n" + "\t'p' type_id=2", + "[6] STRUCT 's1' size=4 vlen=1\n" + "\t'm' type_id=1 bits_offset=0"); + + /* Can not map to base ID */ + permute_ids[0] = 4; + permute_ids[1] = 2; + permute_ids[2] = 5; + permute_ids[3] = 6; + err = btf__permute(split_btf, permute_ids, 4, NULL); + if (!ASSERT_ERR(err, "btf__permute_split")) + goto cleanup; + + VALIDATE_RAW_BTF( + split_btf, + "[1] INT 'int' size=4 bits_offset=0 nr_bits=32 encoding=SIGNED", + "[2] PTR '(anon)' type_id=1", + "[3] STRUCT 's2' size=4 vlen=1\n" + "\t'm' type_id=1 bits_offset=0", + "[4] FUNC 'f' type_id=5 linkage=static", + "[5] FUNC_PROTO '(anon)' ret_type_id=1 vlen=1\n" + "\t'p' type_id=2", + "[6] STRUCT 's1' size=4 vlen=1\n" + "\t'm' type_id=1 bits_offset=0"); + +cleanup: + btf__free(split_btf); + btf__free(base_btf); +} + +/* Verify btf__permute function drops types correctly with base_btf */ +static void test_permute_drop_base(void) +{ + struct btf *btf; + __u32 permute_ids[7]; + int err; + + btf = btf__new_empty(); + if (!ASSERT_OK_PTR(btf, "empty_main_btf")) + return; + + btf__add_int(btf, "int", 4, BTF_INT_SIGNED); /* [1] int */ + btf__add_ptr(btf, 1); /* [2] ptr to int */ + btf__add_struct(btf, "s1", 4); /* [3] struct s1 { */ + btf__add_field(btf, "m", 1, 0, 0); /* int m; */ + /* } */ + btf__add_struct(btf, "s2", 4); /* [4] struct s2 { */ + btf__add_field(btf, "m", 1, 0, 0); /* int m; */ + /* } */ + btf__add_func_proto(btf, 1); /* [5] int (*)(int *p); */ + btf__add_func_param(btf, "p", 2); + btf__add_func(btf, "f", BTF_FUNC_STATIC, 5); /* [6] int f(int *p); */ + + VALIDATE_RAW_BTF( + btf, + "[1] INT 'int' size=4 bits_offset=0 nr_bits=32 encoding=SIGNED", + "[2] PTR '(anon)' type_id=1", + "[3] STRUCT 's1' size=4 vlen=1\n" + "\t'm' type_id=1 bits_offset=0", + "[4] STRUCT 's2' size=4 vlen=1\n" + "\t'm' type_id=1 bits_offset=0", + "[5] FUNC_PROTO '(anon)' ret_type_id=1 vlen=1\n" + "\t'p' type_id=2", + "[6] FUNC 'f' type_id=5 linkage=static"); + + /* Drop ID 4 */ + permute_ids[0] = 0; + permute_ids[1] = 5; /* [1] -> [5] */ + permute_ids[2] = 1; /* [2] -> [1] */ + permute_ids[3] = 2; /* [3] -> [2] */ + permute_ids[4] = 0; /* Drop [4] */ + permute_ids[5] = 3; /* [5] -> [3] */ + permute_ids[6] = 4; /* [6] -> [4] */ + err = btf__permute(btf, permute_ids, ARRAY_SIZE(permute_ids), NULL); + if (!ASSERT_OK(err, "btf__permute_drop_base")) + goto done; + + VALIDATE_RAW_BTF( + btf, + "[1] PTR '(anon)' type_id=5", + "[2] STRUCT 's1' size=4 vlen=1\n" + "\t'm' type_id=5 bits_offset=0", + "[3] FUNC_PROTO '(anon)' ret_type_id=5 vlen=1\n" + "\t'p' type_id=1", + "[4] FUNC 'f' type_id=3 linkage=static", + "[5] INT 'int' size=4 bits_offset=0 nr_bits=32 encoding=SIGNED"); + + /* Continue dropping */ + permute_ids[0] = 0; + permute_ids[1] = 1; /* [1] -> [1] */ + permute_ids[2] = 2; /* [2] -> [2] */ + permute_ids[3] = 3; /* [3] -> [3] */ + permute_ids[4] = 0; /* Drop [4] */ + permute_ids[5] = 4; /* [5] -> [4] */ + err = btf__permute(btf, permute_ids, 6, NULL); + if (!ASSERT_OK(err, "btf__permute_drop_base_fail")) + goto done; + + VALIDATE_RAW_BTF( + btf, + "[1] PTR '(anon)' type_id=4", + "[2] STRUCT 's1' size=4 vlen=1\n" + "\t'm' type_id=4 bits_offset=0", + "[3] FUNC_PROTO '(anon)' ret_type_id=4 vlen=1\n" + "\t'p' type_id=1", + "[4] INT 'int' size=4 bits_offset=0 nr_bits=32 encoding=SIGNED"); + + /* Cannot drop the ID referenced by others */ + permute_ids[0] = 0; + permute_ids[1] = 2; + permute_ids[2] = 3; + permute_ids[3] = 1; + permute_ids[4] = 0; /* [4] is referenced by others */ + err = btf__permute(btf, permute_ids, 5, NULL); + if (!ASSERT_ERR(err, "btf__permute_drop_base_fail")) + goto done; + + VALIDATE_RAW_BTF( + btf, + "[1] PTR '(anon)' type_id=4", + "[2] STRUCT 's1' size=4 vlen=1\n" + "\t'm' type_id=4 bits_offset=0", + "[3] FUNC_PROTO '(anon)' ret_type_id=4 vlen=1\n" + "\t'p' type_id=1", + "[4] INT 'int' size=4 bits_offset=0 nr_bits=32 encoding=SIGNED"); + + /* Drop 2 IDs at once */ + permute_ids[0] = 0; + permute_ids[1] = 2; /* [1] -> [2] */ + permute_ids[2] = 0; /* Drop [2] */ + permute_ids[3] = 0; /* Drop [3] */ + permute_ids[4] = 1; /* [4] -> [1] */ + err = btf__permute(btf, permute_ids, 5, NULL); + if (!ASSERT_OK(err, "btf__permute_drop_base_fail")) + goto done; + + VALIDATE_RAW_BTF( + btf, + "[1] INT 'int' size=4 bits_offset=0 nr_bits=32 encoding=SIGNED", + "[2] PTR '(anon)' type_id=1"); + + /* Drop all IDs */ + permute_ids[0] = 0; + permute_ids[1] = 0; /* Drop [1] */ + permute_ids[2] = 0; /* Drop [2] */ + err = btf__permute(btf, permute_ids, 3, NULL); + if (!ASSERT_OK(err, "btf__permute_drop_base_fail")) + goto done; + if (!ASSERT_EQ(btf__type_cnt(btf), 0, "btf__permute_drop_split all")) + goto done; + +done: + btf__free(btf); +} + +/* Verify btf__permute function drops types correctly with split BTF */ +static void test_permute_drop_split(void) +{ + struct btf *split_btf = NULL, *base_btf = NULL; + __u32 permute_ids[4]; + int err; + + base_btf = btf__new_empty(); + if (!ASSERT_OK_PTR(base_btf, "empty_main_btf")) + return; + + btf__add_int(base_btf, "int", 4, BTF_INT_SIGNED); /* [1] int */ + btf__add_ptr(base_btf, 1); /* [2] ptr to int */ + VALIDATE_RAW_BTF( + base_btf, + "[1] INT 'int' size=4 bits_offset=0 nr_bits=32 encoding=SIGNED", + "[2] PTR '(anon)' type_id=1"); + split_btf = btf__new_empty_split(base_btf); + if (!ASSERT_OK_PTR(split_btf, "empty_split_btf")) + goto cleanup; + btf__add_struct(split_btf, "s1", 4); /* [3] struct s1 { */ + btf__add_field(split_btf, "m", 1, 0, 0); /* int m; */ + /* } */ + btf__add_struct(split_btf, "s2", 4); /* [4] struct s2 { */ + btf__add_field(split_btf, "m", 1, 0, 0); /* int m; */ + /* } */ + btf__add_func_proto(split_btf, 1); /* [5] int (*)(int p); */ + btf__add_func_param(split_btf, "p", 2); + btf__add_func(split_btf, "f", BTF_FUNC_STATIC, 5); /* [6] int f(int *p); */ + + VALIDATE_RAW_BTF( + split_btf, + "[1] INT 'int' size=4 bits_offset=0 nr_bits=32 encoding=SIGNED", + "[2] PTR '(anon)' type_id=1", + "[3] STRUCT 's1' size=4 vlen=1\n" + "\t'm' type_id=1 bits_offset=0", + "[4] STRUCT 's2' size=4 vlen=1\n" + "\t'm' type_id=1 bits_offset=0", + "[5] FUNC_PROTO '(anon)' ret_type_id=1 vlen=1\n" + "\t'p' type_id=2", + "[6] FUNC 'f' type_id=5 linkage=static"); + + /* Drop ID 4 */ + permute_ids[0] = 5; /* [3] -> [5] */ + permute_ids[1] = 0; /* Drop [4] */ + permute_ids[2] = 3; /* [5] -> [3] */ + permute_ids[3] = 4; /* [6] -> [4] */ + err = btf__permute(split_btf, permute_ids, ARRAY_SIZE(permute_ids), NULL); + if (!ASSERT_OK(err, "btf__permute_drop_split")) + goto cleanup; + + VALIDATE_RAW_BTF( + split_btf, + "[1] INT 'int' size=4 bits_offset=0 nr_bits=32 encoding=SIGNED", + "[2] PTR '(anon)' type_id=1", + "[3] FUNC_PROTO '(anon)' ret_type_id=1 vlen=1\n" + "\t'p' type_id=2", + "[4] FUNC 'f' type_id=3 linkage=static", + "[5] STRUCT 's1' size=4 vlen=1\n" + "\t'm' type_id=1 bits_offset=0"); + + /* Can not drop the type referenced by others */ + permute_ids[0] = 0; /* [3] is referenced by [4] */ + permute_ids[1] = 4; + permute_ids[2] = 3; + err = btf__permute(split_btf, permute_ids, 3, NULL); + if (!ASSERT_ERR(err, "btf__permute_drop_split")) + goto cleanup; + + VALIDATE_RAW_BTF( + split_btf, + "[1] INT 'int' size=4 bits_offset=0 nr_bits=32 encoding=SIGNED", + "[2] PTR '(anon)' type_id=1", + "[3] FUNC_PROTO '(anon)' ret_type_id=1 vlen=1\n" + "\t'p' type_id=2", + "[4] FUNC 'f' type_id=3 linkage=static", + "[5] STRUCT 's1' size=4 vlen=1\n" + "\t'm' type_id=1 bits_offset=0"); + + /* Continue dropping */ + permute_ids[0] = 0; /* Drop [3] */ + permute_ids[1] = 0; /* Drop [4] */ + permute_ids[2] = 3; /* [5] -> [3] */ + err = btf__permute(split_btf, permute_ids, 3, NULL); + if (!ASSERT_OK(err, "btf__permute_drop_split")) + goto cleanup; + + VALIDATE_RAW_BTF( + split_btf, + "[1] INT 'int' size=4 bits_offset=0 nr_bits=32 encoding=SIGNED", + "[2] PTR '(anon)' type_id=1", + "[3] STRUCT 's1' size=4 vlen=1\n" + "\t'm' type_id=1 bits_offset=0"); + + /* Continue dropping */ + permute_ids[0] = 0; /* Drop [3] */ + err = btf__permute(split_btf, permute_ids, 1, NULL); + if (!ASSERT_OK(err, "btf__permute_drop_split")) + goto cleanup; + + VALIDATE_RAW_BTF( + split_btf, + "[1] INT 'int' size=4 bits_offset=0 nr_bits=32 encoding=SIGNED", + "[2] PTR '(anon)' type_id=1"); + +cleanup: + btf__free(split_btf); + btf__free(base_btf); +} + +/* Verify btf__permute then btf__dedup work correctly */ +static void test_permute_drop_dedup(void) +{ + struct btf *btf, *new_btf = NULL; + const struct btf_header *hdr; + const void *btf_data; + char expect_strs[] = "\0int\0s1\0m\0tag1\0tag2\0tag3"; + char expect_strs_dedupped[] = "\0int\0s1\0m\0tag1"; + __u32 permute_ids[6], btf_size; + int err; + + btf = btf__new_empty(); + if (!ASSERT_OK_PTR(btf, "empty_main_btf")) + return; + + btf__add_int(btf, "int", 4, BTF_INT_SIGNED); /* [1] int */ + btf__add_struct(btf, "s1", 4); /* [2] struct s1 { */ + btf__add_field(btf, "m", 1, 0, 0); /* int m; */ + /* } */ + btf__add_decl_tag(btf, "tag1", 2, -1); /* [3] tag -> s1: tag1 */ + btf__add_decl_tag(btf, "tag2", 2, 1); /* [4] tag -> s1/m: tag2 */ + btf__add_decl_tag(btf, "tag3", 2, 1); /* [5] tag -> s1/m: tag3 */ + + VALIDATE_RAW_BTF( + btf, + "[1] INT 'int' size=4 bits_offset=0 nr_bits=32 encoding=SIGNED", + "[2] STRUCT 's1' size=4 vlen=1\n" + "\t'm' type_id=1 bits_offset=0", + "[3] DECL_TAG 'tag1' type_id=2 component_idx=-1", + "[4] DECL_TAG 'tag2' type_id=2 component_idx=1", + "[5] DECL_TAG 'tag3' type_id=2 component_idx=1"); + + btf_data = btf__raw_data(btf, &btf_size); + if (!ASSERT_OK_PTR(btf_data, "btf__raw_data")) + goto done; + hdr = btf_data; + if (!ASSERT_EQ(hdr->str_len, ARRAY_SIZE(expect_strs), "expect_strs")) + goto done; + + new_btf = btf__new(btf_data, btf_size); + if (!ASSERT_OK_PTR(new_btf, "btf__new")) + goto done; + + /* Drop 2 IDs result in unreferenced strings */ + permute_ids[0] = 0; + permute_ids[1] = 3; /* [1] -> [3] */ + permute_ids[2] = 1; /* [2] -> [1] */ + permute_ids[3] = 2; /* [3] -> [2] */ + permute_ids[4] = 0; /* Drop result in unreferenced "tag2" */ + permute_ids[5] = 0; /* Drop result in unreferenced "tag3" */ + err = btf__permute(new_btf, permute_ids, ARRAY_SIZE(permute_ids), NULL); + if (!ASSERT_OK(err, "btf__permute")) + goto done; + + VALIDATE_RAW_BTF( + new_btf, + "[1] STRUCT 's1' size=4 vlen=1\n" + "\t'm' type_id=3 bits_offset=0", + "[2] DECL_TAG 'tag1' type_id=1 component_idx=-1", + "[3] INT 'int' size=4 bits_offset=0 nr_bits=32 encoding=SIGNED"); + + btf_data = btf__raw_data(new_btf, &btf_size); + if (!ASSERT_OK_PTR(btf_data, "btf__raw_data")) + goto done; + hdr = btf_data; + if (!ASSERT_EQ(hdr->str_len, ARRAY_SIZE(expect_strs), "expect_strs")) + goto done; + + err = btf__dedup(new_btf, NULL); + if (!ASSERT_OK(err, "btf__dedup")) + goto done; + + btf_data = btf__raw_data(new_btf, &btf_size); + if (!ASSERT_OK_PTR(btf_data, "btf__raw_data")) + goto done; + hdr = btf_data; + if (!ASSERT_EQ(hdr->str_len, ARRAY_SIZE(expect_strs_dedupped), "expect_strs_dedupped")) + goto done; + +done: + btf__free(btf); + btf__free(new_btf); +} + +void test_btf_permute(void) +{ + if (test__start_subtest("permute_base")) + test_permute_base(); + if (test__start_subtest("permute_split")) + test_permute_split(); + if (test__start_subtest("permute_drop_base")) + test_permute_drop_base(); + if (test__start_subtest("permute_drop_split")) + test_permute_drop_split(); + if (test__start_subtest("permute_drop_dedup")) + test_permute_drop_dedup(); +} -- 2.34.1