Merge bitcoin-core/secp256k1#1008: bench.c: add --help option and ci: move env variables

592661c ci: move test environment variable declaration to .cirrus.yml (siv2r)
dcbe84b bench: add --help option to bench. (siv2r)

Pull request description:

  Fixes bitcoin#1005

  **Changes:**
  - added `--help` option to `bench.c`
      - `help()` function prints the help to command-line
      - `have_invalid_args()` checks if the user has entered an invalid argument
  - moved `secp256k1_bench_iters` and `secp256k1_test_iters` environment variables declaration to `.cirrus.yml`

ACKs for top commit:
  sipa:
    utACK 592661c
  real-or-random:
    ACK 592661c

Tree-SHA512: ebc6a2e6e47b529212efa1c9b75cc79649fca7f42aa75ce46502db24ac94f46b6cef59c828d13265d1fa69187a81c140d1951e7daeb7c8e008a6c1ad75259741

Author: real-or-random

.cirrus.yml

@@ -19,9 +19,9 @@ env:
   RECOVERY: no
   SCHNORRSIG: no
   ### test options
-  TEST_ITERS:
+  SECP256K1_TEST_ITERS:
   BENCH: yes
-  BENCH_ITERS: 2
+  SECP256K1_BENCH_ITERS: 2
   CTIMETEST: yes
 
 cat_logs_snippet: &CAT_LOGS
@@ -171,7 +171,7 @@ task:
     memory: 1G
   env:
     WRAPPER_CMD: qemu-s390x
-    TEST_ITERS: 16
+    SECP256K1_TEST_ITERS: 16
     HOST: s390x-linux-gnu
     WITH_VALGRIND: no
     ECDH: yes
@@ -194,7 +194,7 @@ task:
     memory: 1G
   env:
     WRAPPER_CMD: qemu-arm
-    TEST_ITERS: 16
+    SECP256K1_TEST_ITERS: 16
     HOST: arm-linux-gnueabihf
     WITH_VALGRIND: no
     ECDH: yes
@@ -218,7 +218,7 @@ task:
     memory: 1G
   env:
     WRAPPER_CMD: qemu-aarch64
-    TEST_ITERS: 16
+    SECP256K1_TEST_ITERS: 16
     HOST: aarch64-linux-gnu
     WITH_VALGRIND: no
     ECDH: yes
@@ -239,7 +239,7 @@ task:
     memory: 1G
   env:
     WRAPPER_CMD: qemu-ppc64le
-    TEST_ITERS: 16
+    SECP256K1_TEST_ITERS: 16
     HOST: powerpc64le-linux-gnu
     WITH_VALGRIND: no
     ECDH: yes
@@ -260,7 +260,7 @@ task:
     memory: 1G
   env:
     WRAPPER_CMD: wine64-stable
-    TEST_ITERS: 16
+    SECP256K1_TEST_ITERS: 16
     HOST: x86_64-w64-mingw32
     WITH_VALGRIND: no
     ECDH: yes
@@ -290,15 +290,15 @@ task:
       env:
         # The `--error-exitcode` is required to make the test fail if valgrind found errors, otherwise it'll return 0 (https://www.valgrind.org/docs/manual/manual-core.html)
         WRAPPER_CMD: "valgrind --error-exitcode=42"
-        TEST_ITERS: 16
+        SECP256K1_TEST_ITERS: 16
     - name: "UBSan, ASan, LSan"
       env:
         CFLAGS: "-fsanitize=undefined,address -g"
         CFLAGS_FOR_BUILD: "-fsanitize=undefined,address -g"
         UBSAN_OPTIONS: "print_stacktrace=1:halt_on_error=1"
         ASAN_OPTIONS: "strict_string_checks=1:detect_stack_use_after_return=1:detect_leaks=1"
         LSAN_OPTIONS: "use_unaligned=1"
-        TEST_ITERS: 32
+        SECP256K1_TEST_ITERS: 32
   # Try to cover many configurations with just a tiny matrix.
   matrix:
     - env:

ci/cirrus.sh

@@ -32,10 +32,6 @@ file .libs/* || true
 # This tells `make check` to wrap test invocations.
 export LOG_COMPILER="$WRAPPER_CMD"
 
-# This limits the iterations in the tests and benchmarks.
-export SECP256K1_TEST_ITERS="$TEST_ITERS"
-export SECP256K1_BENCH_ITERS="$BENCH_ITERS"
-
 make "$BUILD"
 
 if [ "$BENCH" = "yes" ]

src/bench.c

@@ -11,6 +11,51 @@
 #include "util.h"
 #include "bench.h"
 
+void help(int default_iters) {
+    printf("Benchmarks the following algorithms:\n");
+    printf("    - ECDSA signing/verification\n");
+
+#ifdef ENABLE_MODULE_ECDH
+    printf("    - ECDH key exchange (optional module)\n");
+#endif
+
+#ifdef ENABLE_MODULE_RECOVERY
+    printf("    - Public key recovery (optional module)\n");
+#endif
+
+#ifdef ENABLE_MODULE_SCHNORRSIG
+    printf("    - Schnorr signatures (optional module)\n");
+#endif
+
+    printf("\n");
+    printf("The default number of iterations for each benchmark is %d. This can be\n", default_iters);
+    printf("customized using the SECP256K1_BENCH_ITERS environment variable.\n");
+    printf("\n");
+    printf("Usage: ./bench [args]\n");
+    printf("By default, all benchmarks will be run.\n");
+    printf("args:\n");
+    printf("    help              : display this help and exit\n");
+    printf("    ecdsa             : all ECDSA algorithms--sign, verify, recovery (if enabled)\n");
+    printf("    ecdsa_sign        : ECDSA siging algorithm\n");
+    printf("    ecdsa_verify      : ECDSA verification algorithm\n");
+
+#ifdef ENABLE_MODULE_RECOVERY
+    printf("    ecdsa_recover     : ECDSA public key recovery algorithm\n");
+#endif
+
+#ifdef ENABLE_MODULE_ECDH
+    printf("    ecdh              : ECDH key exchange algorithm\n");
+#endif
+
+#ifdef ENABLE_MODULE_SCHNORRSIG
+    printf("    schnorrsig        : all Schnorr signature algorithms (sign, verify)\n");
+    printf("    schnorrsig_sign   : Schnorr sigining algorithm\n");
+    printf("    schnorrsig_verify : Schnorr verification algorithm\n");
+#endif
+
+    printf("\n");
+}
+
 typedef struct {
     secp256k1_context *ctx;
     unsigned char msg[32];
@@ -95,7 +140,52 @@ int main(int argc, char** argv) {
     bench_verify_data data;
 
     int d = argc == 1;
-    int iters = get_iters(20000);
+    int default_iters = 20000;
+    int iters = get_iters(default_iters);
+
+    /* Check for invalid user arguments */
+    char* valid_args[] = {"ecdsa", "verify", "ecdsa_verify", "sign", "ecdsa_sign", "ecdh", "recover",
+                         "ecdsa_recover", "schnorrsig", "schnorrsig_verify", "schnorrsig_sign"};
+    size_t valid_args_size = sizeof(valid_args)/sizeof(valid_args[0]);
+    int invalid_args = have_invalid_args(argc, argv, valid_args, valid_args_size);
+
+    if (argc > 1) {
+        if (have_flag(argc, argv, "-h")
+           || have_flag(argc, argv, "--help")
+           || have_flag(argc, argv, "help")) {
+            help(default_iters);
+            return 0;
+        } else if (invalid_args) {
+            fprintf(stderr, "./bench: unrecognized argument.\n\n");
+            help(default_iters);
+            return 1;
+        }
+    }
+
+/* Check if the user tries to benchmark optional module without building it */
+#ifndef ENABLE_MODULE_ECDH
+    if (have_flag(argc, argv, "ecdh")) { 
+        fprintf(stderr, "./bench: ECDH module not enabled.\n");
+        fprintf(stderr, "Use ./configure --enable-module-ecdh.\n\n");
+        return 1;
+    }
+#endif
+
+#ifndef ENABLE_MODULE_RECOVERY
+    if (have_flag(argc, argv, "recover") || have_flag(argc, argv, "ecdsa_recover")) { 
+        fprintf(stderr, "./bench: Public key recovery module not enabled.\n");
+        fprintf(stderr, "Use ./configure --enable-module-recovery.\n\n");
+        return 1;
+    }
+#endif
+
+#ifndef ENABLE_MODULE_SCHNORRSIG
+    if (have_flag(argc, argv, "schnorrsig") || have_flag(argc, argv, "schnorrsig_sign") || have_flag(argc, argv, "schnorrsig_verify")) { 
+        fprintf(stderr, "./bench: Schnorr signatures module not enabled.\n");
+        fprintf(stderr, "Use ./configure --enable-module-schnorrsig.\n\n");
+        return 1;
+    }
+#endif
 
     /* ECDSA verification benchmark */
     data.ctx = secp256k1_context_create(SECP256K1_CONTEXT_SIGN | SECP256K1_CONTEXT_VERIFY);

src/bench.h

@@ -116,7 +116,7 @@ void run_benchmark(char *name, void (*benchmark)(void*, int), void (*setup)(void
 int have_flag(int argc, char** argv, char *flag) {
     char** argm = argv + argc;
     argv++;
-    while (argv != NULL && argv != argm) {
+    while (argv != argm) {
         if (strcmp(*argv, flag) == 0) {
             return 1;
         }
@@ -125,6 +125,32 @@ int have_flag(int argc, char** argv, char *flag) {
     return 0;
 }
 
+/* takes an array containing the arguments that the user is allowed to enter on the command-line
+   returns:
+      - 1 if the user entered an invalid argument
+      - 0 if all the user entered arguments are valid */
+int have_invalid_args(int argc, char** argv, char** valid_args, size_t n) {
+    size_t i;
+    int found_valid;
+    char** argm = argv + argc;
+    argv++;
+
+    while (argv != argm) {
+        found_valid = 0;
+        for (i = 0; i < n; i++) {
+            if (strcmp(*argv, valid_args[i]) == 0) {
+                found_valid = 1; /* user entered a valid arg from the list */
+                break;
+            }
+        }
+        if (found_valid == 0) {
+            return 1; /* invalid arg found */
+        }
+        argv++;
+    }
+    return 0;
+}
+
 int get_iters(int default_iters) {
     char* env = getenv("SECP256K1_BENCH_ITERS");
     if (env) {

src/bench_ecmult.c

@@ -292,7 +292,7 @@ int main(int argc, char **argv) {
            || have_flag(argc, argv, "--help")
            || have_flag(argc, argv, "help")) {
             help(argv);
-            return 1;
+            return 0;
         } else if(have_flag(argc, argv, "pippenger_wnaf")) {
             printf("Using pippenger_wnaf:\n");
             data.ecmult_multi = secp256k1_ecmult_pippenger_batch_single;