testdata: add .clang-format

Enforce a common formatting across C code.

.clang-format

@@ -0,0 +1,17 @@
+---
+Language:        Cpp
+BasedOnStyle:    LLVM
+AlignAfterOpenBracket: DontAlign
+AlignConsecutiveAssignments: true
+AlignEscapedNewlines: DontAlign
+AlwaysBreakBeforeMultilineStrings: true
+AlwaysBreakTemplateDeclarations: false
+AllowAllParametersOfDeclarationOnNextLine: false
+AllowShortFunctionsOnASingleLine: false
+BreakBeforeBraces: Attach
+IndentWidth:     4
+KeepEmptyLinesAtTheStartOfBlocks: false
+TabWidth:        4
+UseTab:          ForContinuationAndIndentation
+ColumnLimit:     1000
+...

cmd/bpf2go/testdata/minimal.c

@@ -2,4 +2,6 @@
 
 char __license[] __attribute__((section("license"), used)) = "MIT";
 
-__attribute__((section("socket"), used)) int filter() { return 0; }
+__attribute__((section("socket"), used)) int filter() {
+	return 0;
+}

testdata/common.h

@@ -4,7 +4,7 @@ typedef unsigned int uint32_t;
 typedef unsigned long uint64_t;
 
 #define __section(NAME) __attribute__((section(NAME), used))
-#define __uint(name, val) int (*name)[val]
+#define __uint(name, val) int(*name)[val]
 #define __type(name, val) typeof(val) *name
 
 #define BPF_MAP_TYPE_ARRAY (1)
@@ -24,6 +24,8 @@ struct bpf_map_def {
 	unsigned int map_flags;
 };
 
-static void* (*map_lookup_elem)(const void *map, const void *key) = (void*)1;
-static int (*perf_event_output)(const void *ctx, const void *map, uint64_t index, const void *data, uint64_t size) = (void*)25;
-static uint32_t (*get_smp_processor_id)(void) = (void*)8;
+static void *(*map_lookup_elem)(const void *map, const void *key) = (void *)1;
+
+static int (*perf_event_output)(const void *ctx, const void *map, uint64_t index, const void *data, uint64_t size) = (void *)25;
+
+static uint32_t (*get_smp_processor_id)(void) = (void *)8;

testdata/invalid_map.c

@@ -9,11 +9,12 @@ struct {
 	struct bpf_map_def def;
 	uint32_t dummy;
 } invalid_map __section("maps") = {
-	.def = {
-		.type        = BPF_MAP_TYPE_ARRAY,
-		.key_size    = 4,
-		.value_size  = 2,
-		.max_entries = 1,
-	},
-	.dummy       = 1,
+	.def =
+		{
+			.type        = BPF_MAP_TYPE_ARRAY,
+			.key_size    = 4,
+			.value_size  = 2,
+			.max_entries = 1,
+		},
+	.dummy = 1,
 };

testdata/loader.c

@@ -10,7 +10,7 @@ struct bpf_map_def hash_map __section("maps") = {
 	.key_size    = 4,
 	.value_size  = 2,
 	.max_entries = 1,
-	.map_flags       = 0,
+	.map_flags   = 0,
 };
 
 struct bpf_map_def hash_map2 __section("maps") = {
@@ -22,14 +22,14 @@ struct bpf_map_def hash_map2 __section("maps") = {
 };
 
 struct bpf_map_def array_of_hash_map __section("maps") = {
-	.type = BPF_MAP_TYPE_ARRAY_OF_MAPS,
-	.key_size = sizeof(uint32_t),
+	.type        = BPF_MAP_TYPE_ARRAY_OF_MAPS,
+	.key_size    = sizeof(uint32_t),
 	.max_entries = 2,
 };
 
 struct bpf_map_def hash_of_hash_map __section("maps") = {
-	.type = BPF_MAP_TYPE_HASH_OF_MAPS,
-	.key_size = sizeof(uint32_t),
+	.type        = BPF_MAP_TYPE_HASH_OF_MAPS,
+	.key_size    = sizeof(uint32_t),
 	.max_entries = 2,
 };
 
@@ -60,30 +60,30 @@ int __attribute__((noinline)) global_fn2(uint32_t arg) {
 }
 
 int __attribute__((noinline)) __section("other") global_fn3(uint32_t arg) {
-	return arg+1;
+	return arg + 1;
 }
 
 int __attribute__((noinline)) global_fn(uint32_t arg) {
 	return static_fn(arg) + global_fn2(arg) + global_fn3(arg);
 }
 
 #if __clang_major__ >= 9
-static volatile unsigned int key1 = 0; // .bss
-static volatile unsigned int key2 = 1; // .data
+static volatile unsigned int key1       = 0; // .bss
+static volatile unsigned int key2       = 1; // .data
 static volatile const unsigned int key3 = 2; // .rodata
-static volatile const uint32_t arg; // .rodata, rewritten by loader
+static volatile const uint32_t arg;          // .rodata, rewritten by loader
 #endif
 
 __section("xdp") int xdp_prog() {
 #if __clang_major__ < 9
 	unsigned int key1 = 0;
 	unsigned int key2 = 1;
 	unsigned int key3 = 2;
-	uint32_t arg = 1;
+	uint32_t arg      = 1;
 #endif
-	map_lookup_elem(&hash_map, (void*)&key1);
-	map_lookup_elem(&hash_map2, (void*)&key2);
-	map_lookup_elem(&hash_map2, (void*)&key3);
+	map_lookup_elem(&hash_map, (void *)&key1);
+	map_lookup_elem(&hash_map2, (void *)&key2);
+	map_lookup_elem(&hash_map2, (void *)&key3);
 	return static_fn(arg) + global_fn(arg);
 }
 

testdata/raw_tracepoint.c

@@ -9,5 +9,5 @@ struct bpf_args {
 };
 
 __section("raw_tracepoint/sched_process_exec") int sched_process_exec(struct bpf_args *ctx) {
-    return 0;
+	return 0;
 }

testdata/rewrite.c

@@ -23,7 +23,7 @@ __section("socket") int rewrite() {
 }
 
 __section("socket/map") int rewrite_map() {
-	unsigned int key = 0;
+	unsigned int key    = 0;
 	unsigned int *value = map_lookup_elem(&map_val, &key);
 	if (!value) {
 		return 0;