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[tor-commits] [tor/master] Start work on fancy compiler tricks to expose extra stuff to our tests

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Subject: [tor-commits] [tor/master] Start work on fancy compiler tricks to expose extra stuff to our tests
From: nickm@xxxxxxxxxxxxxx
Date: Mon, 15 Jul 2013 16:06:52 +0000 (UTC)
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Delivery-date: Mon, 15 Jul 2013 12:07:06 -0400
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Patch-author: Nick Mathewson <nickm@xxxxxxxxxxxxxx>
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commit f7d654b81e1a65803c22bb53fc1d3a2021d87d50
Author: Nick Mathewson <nickm@xxxxxxxxxxxxxx>
Date:   Thu Jun 6 14:56:05 2013 -0400

    Start work on fancy compiler tricks to expose extra stuff to our tests
    
    This is mainly a matter of automake trickery: we build each static
    library in two versions now: one with the TOR_UNIT_TESTS macro
    defined, and one without.  When TOR_UNIT_TESTS is defined, we can
    enable mocking and expose more functions. When it's not defined, we
    can lock the binary down more.
    
    The alternatives would be to have alternate build modes: a "testing
    configuration" for building the libraries with test support, and a
    "production configuration" for building them without.  I don't favor
    that approach, since I think it would mean more people runnning
    binaries build for testing, or more people not running unit tests.
---
 .gitignore               |    4 ++++
 changes/fancy_testing    |    9 +++++++++
 configure.ac             |    4 ++++
 src/common/include.am    |   31 +++++++++++++++++++++++++++----
 src/common/testsupport.h |   14 ++++++++++++++
 src/or/include.am        |   14 ++++++++++++--
 src/test/include.am      |   14 +++++++++-----
 7 files changed, 79 insertions(+), 11 deletions(-)

diff --git a/.gitignore b/.gitignore
index e48918d..bb3817b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -128,10 +128,13 @@
 /src/common/Makefile.in
 /src/common/common_sha1.i
 /src/common/libor.a
+/src/common/libor-testing.a
 /src/common/libor.lib
 /src/common/libor-crypto.a
+/src/common/libor-crypto-testing.a
 /src/common/libor-crypto.lib
 /src/common/libor-event.a
+/src/common/libor-event-testing.a
 /src/common/libor-event.lib
 /src/common/libcurve25519_donna.a
 /src/common/libcurve25519_donna.lib
@@ -150,6 +153,7 @@
 /src/or/tor
 /src/or/tor.exe
 /src/or/libtor.a
+/src/or/libtor-testing.a
 /src/or/libtor.lib
 
 # /src/test
diff --git a/changes/fancy_testing b/changes/fancy_testing
new file mode 100644
index 0000000..4d97194
--- /dev/null
+++ b/changes/fancy_testing
@@ -0,0 +1,9 @@
+  o Build features:
+
+    - Tor now builds each source file in two modes: a mode that avoids
+      exposing identifiers needlessly, and another mode that exposes
+      more identifiers for testing. This lets the compiler do better at
+      optimizing the production code, while enabling us to take more
+      radical measures to let the unit tests test things.
+
+
diff --git a/configure.ac b/configure.ac
index 235f19b..34ed524 100644
--- a/configure.ac
+++ b/configure.ac
@@ -39,6 +39,10 @@ AC_ARG_ENABLE(static-tor,
    AS_HELP_STRING(--enable-static-tor, Create an entirely static Tor binary. Requires --with-openssl-dir and --with-libevent-dir and --with-zlib-dir))
 AC_ARG_ENABLE(curve25519,
    AS_HELP_STRING(--disable-curve25519, Build Tor with no curve25519 elliptic-curve crypto support))
+AC_ARG_ENABLE(unittests,
+   AS_HELP_STRING(--disable-unittests, [Don't build unit tests for Tor. Risky!]))
+
+AM_CONDITIONAL(UNITTESTS_ENABLED, test x$unittests != xno)
 
 if test "$enable_static_tor" = "yes"; then
   enable_static_libevent="yes";
diff --git a/src/common/include.am b/src/common/include.am
index 68275cb..3d8cc8e 100644
--- a/src/common/include.am
+++ b/src/common/include.am
@@ -1,5 +1,15 @@
 
-noinst_LIBRARIES+= src/common/libor.a src/common/libor-crypto.a src/common/libor-event.a
+noinst_LIBRARIES += \
+	src/common/libor.a \
+	src/common/libor-crypto.a \
+	src/common/libor-event.a
+
+if UNITTESTS_ENABLED
+noinst_LIBRARIES += \
+	src/common/libor-testing.a \
+	src/common/libor-crypto-testing.a \
+	src/common/libor-event-testing.a
+endif
 
 EXTRA_DIST+= \
   src/common/common_sha1.i	\
@@ -38,7 +48,7 @@ if CURVE25519_ENABLED
 libcrypto_extra_source=src/common/crypto_curve25519.c
 endif
 
-src_common_libor_a_SOURCES = \
+LIBOR_A_SOURCES = \
   src/common/address.c					\
   src/common/compat.c					\
   src/common/container.c				\
@@ -51,7 +61,7 @@ src_common_libor_a_SOURCES = \
   src/common/util_codedigest.c				\
   $(libor_extra_source)
 
-src_common_libor_crypto_a_SOURCES = \
+LIBOR_CRYPTO_A_SOURCES = \
   src/common/aes.c		\
   src/common/crypto.c		\
   src/common/crypto_format.c	\
@@ -59,7 +69,19 @@ src_common_libor_crypto_a_SOURCES = \
   src/common/tortls.c		\
   $(libcrypto_extra_source)
 
-src_common_libor_event_a_SOURCES = src/common/compat_libevent.c
+LIBOR_EVENT_A_SOURCES = src/common/compat_libevent.c
+
+src_common_libor_a_SOURCES = $(LIBOR_A_SOURCES)
+src_common_libor_crypto_a_SOURCES = $(LIBOR_CRYPTO_A_SOURCES)
+src_common_libor_event_a_SOURCES = $(LIBOR_EVENT_A_SOURCES)
+
+src_common_libor_testing_a_SOURCES = $(LIBOR_A_SOURCES)
+src_common_libor_crypto_testing_a_SOURCES = $(LIBOR_CRYPTO_A_SOURCES)
+src_common_libor_event_testing_a_SOURCES = $(LIBOR_EVENT_A_SOURCES)
+
+src_common_libor_testing_a_CPPFLAGS = -DTOR_UNIT_TESTS $(AM_CPPFLAGS)
+src_common_libor_crypto_testing_a_CPPFLAGS = -DTOR_UNIT_TESTS $(AM_CPPFLAGS)
+src_common_libor_event_testing_a_CPPFLAGS = -DTOR_UNIT_TESTS $(AM_CPPFLAGS)
 
 COMMONHEADERS = \
   src/common/address.h				\
@@ -74,6 +96,7 @@ COMMONHEADERS = \
   src/common/memarea.h				\
   src/common/mempool.h				\
   src/common/procmon.h				\
+  src/common/testsupport.h			\
   src/common/torgzip.h				\
   src/common/torint.h				\
   src/common/torlog.h				\
diff --git a/src/common/testsupport.h b/src/common/testsupport.h
new file mode 100644
index 0000000..621fd8c
--- /dev/null
+++ b/src/common/testsupport.h
@@ -0,0 +1,14 @@
+/* Copyright (c) 2013, The Tor Project, Inc. */
+/* See LICENSE for licensing information */
+
+#ifndef TOR_TESTSUPPORT_H
+#define TOR_TESTSUPPORT_H
+
+#ifdef TOR_UNIT_TESTS
+#define STATIC_UNLESS_TESTING
+#else
+#define STATIC_UNLESS_TESTING static
+#endif
+
+#endif
+
diff --git a/src/or/include.am b/src/or/include.am
index 65dbeff..91b9bfc 100644
--- a/src/or/include.am
+++ b/src/or/include.am
@@ -1,5 +1,10 @@
 bin_PROGRAMS+= src/or/tor
-noinst_LIBRARIES+= src/or/libtor.a
+noinst_LIBRARIES += \
+	src/or/libtor.a
+if UNITTESTS_ENABLED
+noinst_LIBRARIES += \
+	src/or/libtor-testing.a
+endif
 
 if BUILD_NT_SERVICES
 tor_platform_source=src/or/ntmain.c
@@ -21,7 +26,7 @@ else
 onion_ntor_source=
 endif
 
-src_or_libtor_a_SOURCES = \
+LIBTOR_A_SOURCES = \
 	src/or/addressmap.c				\
 	src/or/buffers.c				\
 	src/or/channel.c				\
@@ -77,6 +82,9 @@ src_or_libtor_a_SOURCES = \
 	$(onion_ntor_source)				\
 	src/or/config_codedigest.c
 
+src_or_libtor_a_SOURCES = $(LIBTOR_A_SOURCES)
+src_or_libtor_testing_a_SOURCES = $(LIBTOR_A_SOURCES)
+
 #libtor_a_LIBADD = ../common/libor.a ../common/libor-crypto.a \
 #	../common/libor-event.a
 
@@ -90,6 +98,8 @@ AM_CPPFLAGS += -DSHARE_DATADIR="\"$(datadir)\"" \
         -DLOCALSTATEDIR="\"$(localstatedir)\"" \
         -DBINDIR="\"$(bindir)\""
 
+src_or_libtor_testing_a_CPPFLAGS = -DTOR_UNIT_TESTS $(AM_CPPFLAGS)
+
 # -L flags need to go in LDFLAGS. -l flags need to go in LDADD.
 # This seems to matter nowhere but on windows, but I assure you that it
 # matters a lot there, and is quite hard to debug if you forget to do it.
diff --git a/src/test/include.am b/src/test/include.am
index 112d1a7..08eb7fb 100644
--- a/src/test/include.am
+++ b/src/test/include.am
@@ -1,11 +1,15 @@
 TESTS+= src/test/test
 
-noinst_PROGRAMS+= src/test/test src/test/test-child src/test/bench
+noinst_PROGRAMS+= src/test/bench
+if UNITTESTS_ENABLED
+noinst_PROGRAMS+= src/test/test src/test/test-child
+endif
 
 src_test_AM_CPPFLAGS = -DSHARE_DATADIR="\"$(datadir)\"" \
         -DLOCALSTATEDIR="\"$(localstatedir)\"" \
         -DBINDIR="\"$(bindir)\""	       \
-	-I"$(top_srcdir)/src/or" -I"$(top_srcdir)/src/ext"
+	-I"$(top_srcdir)/src/or" -I"$(top_srcdir)/src/ext" \
+	-DTOR_UNIT_TESTS
 
 # -L flags need to go in LDFLAGS. -l flags need to go in LDADD.
 # This seems to matter nowhere but on Windows, but I assure you that it
@@ -36,9 +40,9 @@ src_test_bench_CPPFLAGS= $(src_test_AM_CPPFLAGS)
 
 src_test_test_LDFLAGS = @TOR_LDFLAGS_zlib@ @TOR_LDFLAGS_openssl@ \
         @TOR_LDFLAGS_libevent@
-src_test_test_LDADD = src/or/libtor.a src/common/libor.a \
-	src/common/libor-crypto.a $(LIBDONNA) \
-	src/common/libor-event.a \
+src_test_test_LDADD = src/or/libtor-testing.a src/common/libor-testing.a \
+	src/common/libor-crypto-testing.a $(LIBDONNA) \
+	src/common/libor-event-testing.a \
 	@TOR_ZLIB_LIBS@ @TOR_LIB_MATH@ @TOR_LIBEVENT_LIBS@ \
 	@TOR_OPENSSL_LIBS@ @TOR_LIB_WS32@ @TOR_LIB_GDI@ @CURVE25519_LIBS@
 



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