Split off .c file from precomputed_ecmult_gen.h

stratospher · Dec 18, 2021 · 1a6691a · 1a6691a
1 parent bb36331
commit 1a6691a
Show file tree

Hide file tree

Showing 5 changed files with 9,790 additions and 9,770 deletions.
diff --git a/.gitattributes b/.gitattributes
@@ -1,2 +1,2 @@
 src/precomputed_ecmult.h linguist-generated
-src/precomputed_ecmult_gen.h linguist-generated
+src/precomputed_ecmult_gen.c linguist-generated
diff --git a/Makefile.am b/Makefile.am
@@ -44,6 +44,7 @@ noinst_HEADERS += src/modinv32.h
 noinst_HEADERS += src/modinv32_impl.h
 noinst_HEADERS += src/modinv64.h
 noinst_HEADERS += src/modinv64_impl.h
+noinst_HEADERS += src/precomputed_ecmult_gen.h
 noinst_HEADERS += src/assumptions.h
 noinst_HEADERS += src/util.h
 noinst_HEADERS += src/scratch.h
@@ -62,12 +63,17 @@ noinst_HEADERS += contrib/lax_der_parsing.c
 noinst_HEADERS += contrib/lax_der_privatekey_parsing.h
 noinst_HEADERS += contrib/lax_der_privatekey_parsing.c
 
+PRECOMPUTED_LIB = libsecp256k1_precomputed.la
+noinst_LTLIBRARIES = $(PRECOMPUTED_LIB)
+libsecp256k1_precomputed_la_SOURCES = src/precomputed_ecmult_gen.c
+libsecp256k1_precomputed_la_CPPFLAGS = $(SECP_INCLUDES)
+
 if USE_EXTERNAL_ASM
 COMMON_LIB = libsecp256k1_common.la
-noinst_LTLIBRARIES = $(COMMON_LIB)
 else
 COMMON_LIB =
 endif
+noinst_LTLIBRARIES += $(COMMON_LIB)
 
 pkgconfigdir = $(libdir)/pkgconfig
 pkgconfig_DATA = libsecp256k1.pc
@@ -80,7 +86,7 @@ endif
 
 libsecp256k1_la_SOURCES = src/secp256k1.c
 libsecp256k1_la_CPPFLAGS = -I$(top_srcdir)/include -I$(top_srcdir)/src $(SECP_INCLUDES)
-libsecp256k1_la_LIBADD = $(SECP_LIBS) $(COMMON_LIB)
+libsecp256k1_la_LIBADD = $(SECP_LIBS) $(COMMON_LIB) $(PRECOMPUTED_LIB)
 libsecp256k1_la_LDFLAGS = -no-undefined
 
 if VALGRIND_ENABLED
@@ -93,10 +99,10 @@ noinst_PROGRAMS += bench bench_internal bench_ecmult
 bench_SOURCES = src/bench.c
 bench_LDADD = libsecp256k1.la $(SECP_LIBS) $(SECP_TEST_LIBS) $(COMMON_LIB)
 bench_internal_SOURCES = src/bench_internal.c
-bench_internal_LDADD = $(SECP_LIBS) $(COMMON_LIB)
+bench_internal_LDADD = $(SECP_LIBS) $(COMMON_LIB) $(PRECOMPUTED_LIB)
 bench_internal_CPPFLAGS = $(SECP_INCLUDES)
 bench_ecmult_SOURCES = src/bench_ecmult.c
-bench_ecmult_LDADD = $(SECP_LIBS) $(COMMON_LIB)
+bench_ecmult_LDADD = $(SECP_LIBS) $(COMMON_LIB) $(PRECOMPUTED_LIB)
 bench_ecmult_CPPFLAGS = $(SECP_INCLUDES)
 endif
 
@@ -114,7 +120,7 @@ endif
 if !ENABLE_COVERAGE
 tests_CPPFLAGS += -DVERIFY
 endif
-tests_LDADD = $(SECP_LIBS) $(SECP_TEST_LIBS) $(COMMON_LIB)
+tests_LDADD = $(SECP_LIBS) $(SECP_TEST_LIBS) $(COMMON_LIB) $(PRECOMPUTED_LIB)
 tests_LDFLAGS = -static
 TESTS += tests
 endif
@@ -126,6 +132,7 @@ exhaustive_tests_CPPFLAGS = $(SECP_INCLUDES)
 if !ENABLE_COVERAGE
 exhaustive_tests_CPPFLAGS += -DVERIFY
 endif
+# Note: do not include $(PRECOMPUTED_LIB) in exhaustive_tests (it uses runtime-generated tables).
 exhaustive_tests_LDADD = $(SECP_LIBS) $(COMMON_LIB)
 exhaustive_tests_LDFLAGS = -static
 TESTS += exhaustive_tests
@@ -152,12 +159,12 @@ precompute_ecmult_gen_LDADD = $(SECP_LIBS) $(COMMON_LIB)
 src/precomputed_ecmult.h:
 	$(MAKE) $(AM_MAKEFLAGS) precompute_ecmult$(EXEEXT)
 	./precompute_ecmult$(EXEEXT)
-src/precomputed_ecmult_gen.h:
+src/precomputed_ecmult_gen.c:
 	$(MAKE) $(AM_MAKEFLAGS) precompute_ecmult_gen$(EXEEXT)
 	./precompute_ecmult_gen$(EXEEXT)
 
-PRECOMP = src/precomputed_ecmult_gen.h src/precomputed_ecmult.h
-noinst_HEADERS += $(PRECOMP)
+PRECOMP = src/precomputed_ecmult_gen.c
+noinst_HEADERS += src/precomputed_ecmult.h
 precomp: $(PRECOMP)
 
 # Ensure the prebuilt files will be build first (only if they don't exist,

diff --git a/src/precompute_ecmult_gen.c b/src/precompute_ecmult_gen.c
@@ -1,8 +1,8 @@
-/***********************************************************************
- * Copyright (c) 2013, 2014, 2015 Thomas Daede, Cory Fields            *
- * Distributed under the MIT software license, see the accompanying    *
- * file COPYING or https://www.opensource.org/licenses/mit-license.php.*
- ***********************************************************************/
+/*********************************************************************************
+ * Copyright (c) 2013, 2014, 2015, 2021 Thomas Daede, Cory Fields, Pieter Wuille *
+ * Distributed under the MIT software license, see the accompanying              *
+ * file COPYING or https://www.opensource.org/licenses/mit-license.php.          *
+ *********************************************************************************/
 
 #include <inttypes.h>
 #include <stdio.h>
@@ -15,7 +15,7 @@
 #include "ecmult_gen_compute_table_impl.h"
 
 int main(int argc, char **argv) {
-    const char outfile[] = "src/precomputed_ecmult_gen.h";
+    const char outfile[] = "src/precomputed_ecmult_gen.c";
     FILE* fp;
     int bits;
 
@@ -30,19 +30,17 @@ int main(int argc, char **argv) {
 
     fprintf(fp, "/* This file was automatically generated by precompute_ecmult_gen. */\n");
     fprintf(fp, "/* See ecmult_gen_impl.h for details about the contents of this file. */\n");
-    fprintf(fp, "#ifndef SECP256K1_PRECOMPUTED_ECMULT_GEN_H\n");
-    fprintf(fp, "#define SECP256K1_PRECOMPUTED_ECMULT_GEN_H\n");
-
+    fprintf(fp, "#if defined HAVE_CONFIG_H\n");
+    fprintf(fp, "#include \"libsecp256k1-config.h\"\n");
+    fprintf(fp, "#endif\n");
+    fprintf(fp, "#include \"../include/secp256k1.h\"\n");
     fprintf(fp, "#include \"group.h\"\n");
-
-    fprintf(fp, "#define S(a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p) "
-            "SECP256K1_GE_STORAGE_CONST(0x##a##u,0x##b##u,0x##c##u,0x##d##u,0x##e##u,0x##f##u,0x##g##u,"
-            "0x##h##u,0x##i##u,0x##j##u,0x##k##u,0x##l##u,0x##m##u,0x##n##u,0x##o##u,0x##p##u)\n");
-
+    fprintf(fp, "#include \"ecmult_gen.h\"\n");
     fprintf(fp, "#ifdef EXHAUSTIVE_TEST_ORDER\n");
-    fprintf(fp, "static secp256k1_ge_storage secp256k1_ecmult_gen_prec_table[ECMULT_GEN_PREC_N(ECMULT_GEN_PREC_BITS)][ECMULT_GEN_PREC_G(ECMULT_GEN_PREC_BITS)];\n");
-    fprintf(fp, "#else\n");
-    fprintf(fp, "static const secp256k1_ge_storage secp256k1_ecmult_gen_prec_table[ECMULT_GEN_PREC_N(ECMULT_GEN_PREC_BITS)][ECMULT_GEN_PREC_G(ECMULT_GEN_PREC_BITS)] = {\n");
+    fprintf(fp, "#error Cannot compile precomputed_ecmult_gen.c in exhaustive test mode\n");
+    fprintf(fp, "#endif /* EXHAUSTIVE_TEST_ORDER */\n");
+    fprintf(fp, "#define S(a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p) SECP256K1_GE_STORAGE_CONST(0x##a##u,0x##b##u,0x##c##u,0x##d##u,0x##e##u,0x##f##u,0x##g##u,0x##h##u,0x##i##u,0x##j##u,0x##k##u,0x##l##u,0x##m##u,0x##n##u,0x##o##u,0x##p##u)\n");
+    fprintf(fp, "const secp256k1_ge_storage secp256k1_ecmult_gen_prec_table[ECMULT_GEN_PREC_N(ECMULT_GEN_PREC_BITS)][ECMULT_GEN_PREC_G(ECMULT_GEN_PREC_BITS)] = {\n");
 
     for (bits = 2; bits <= 8; bits *= 2) {
         int g = ECMULT_GEN_PREC_G(bits);
@@ -74,9 +72,7 @@ int main(int argc, char **argv) {
     }
 
     fprintf(fp, "};\n");
-    fprintf(fp, "#endif /* EXHAUSTIVE_TEST_ORDER */\n");
-    fprintf(fp, "#undef SC\n");
-    fprintf(fp, "#endif /* SECP256K1_PRECOMPUTED_ECMULT_GEN_H */\n");
+    fprintf(fp, "#undef S\n");
     fclose(fp);
 
     return 0;