Subzero: Add basic ELFObjectWriter (text section, symtab, strtab, headers)

Makefile.standalone

 # The following variables will likely need to be modified, depending on where
 # and how you built LLVM & Clang. They can be overridden in a command-line
 # invocation of make, like:
 #
 #   make LLVM_SRC_PATH=<path> LLVM_BIN_PATH=<path> \
 #        LIBCXX_INSTALL_PATH=<path> CLANG_PATH=<path> ...
 #
 
 # LLVM_SRC_PATH is the path to the root of the checked out source code. This
 # directory should contain the configure script, the include/ and lib/
@@ skipping 73 matching lines @@
         -fno-exceptions $(OPTLEVEL) $(ASSERTIONS) $(CXX_DEFINES) -g \
         $(HOST_FLAGS) -Wno-error=unused-parameter \
         -I$(LIBCXX_INSTALL_PATH)/include/c++/v1
 LDFLAGS := $(HOST_FLAGS) -L$(LIBCXX_INSTALL_PATH)/lib
 
 SRCS = \
         assembler.cpp \
         assembler_ia32.cpp \
         IceCfg.cpp \
         IceCfgNode.cpp \
+        IceELFObjectWriter.cpp \
+        IceELFSection.cpp \
         IceGlobalContext.cpp \
         IceGlobalInits.cpp \
         IceInst.cpp \
         IceInstX8632.cpp \
         IceIntrinsics.cpp \
         IceLiveness.cpp \
-        IceMemoryRegion.cpp \
         IceOperand.cpp \
         IceRegAlloc.cpp \
         IceRNG.cpp \
         IceTargetLowering.cpp \
         IceTargetLoweringX8632.cpp \
         IceTimerTree.cpp \
         IceTranslator.cpp \
         IceTypeConverter.cpp \
         IceTypes.cpp \
         llvm2ice.cpp \
         PNaClTranslator.cpp
 
 ifndef MINIMAL
   SRCS += IceConverter.cpp
 endif
 
 OBJS=$(patsubst %.cpp, $(OBJDIR)/%.o, $(SRCS))
 
+UNITTEST_SRCS = \
+        IceELFSectionTest.cpp
+
+UNITTEST_OBJS = $(patsubst %.cpp, $(OBJDIR)/unittest/%.o, $(UNITTEST_SRCS))
+UNITTEST_LIB_OBJS = $(filter-out $(OBJDIR)/llvm2ice.o,$(OBJS))
+
 # Keep all the first target so it's the default.
 all: $(OBJDIR)/llvm2ice make_symlink
 
 # Creates symbolic link so that testing is easier. Also runs
 # llvm2ice to verify that the defines flags have valid values,
 # as well as describe the corresponding build attributes.
 make_symlink: $(OBJDIR)/llvm2ice
         rm -rf llvm2ice
         ln -s $(OBJDIR)/llvm2ice
         @echo "Build Attributes:"
         @$(OBJDIR)/llvm2ice --build-atts
 
 .PHONY: all make_symlink
 
 # TODO(kschimpf): Fix python scripts to directly get build attributes
 # rather than generating $(OBJDIR)/llvm2ice.build_atts.
 $(OBJDIR)/llvm2ice: $(OBJS)
         $(CXX) $(LDFLAGS) -o $@ $^ $(LLVM_LDFLAGS) -ldl \
                -Wl,-rpath=$(abspath $(LIBCXX_INSTALL_PATH)/lib)
 
 # TODO: Be more precise than "*.h" here and elsewhere.
 $(OBJS): $(OBJDIR)/%.o: src/%.cpp src/*.h src/*.def
         $(CXX) -c $(CXXFLAGS) $< -o $@
 
+$(OBJDIR)/run_unittests: $(UNITTEST_OBJS) $(UNITTEST_LIB_OBJS)
+        $(CXX) $(LDFLAGS) -o $@ $^ $(LLVM_LDFLAGS) -lgtest -lgtest_main -ldl \
+               -Wl,-rpath=$(abspath $(LIBCXX_INSTALL_PATH)/lib)
+
+$(UNITTEST_OBJS): $(OBJDIR)/unittest/%.o: unittest/%.cpp
+        $(CXX) -c $(CXXFLAGS) \
+                -Isrc/ \
+                -I$(LLVM_SRC_PATH)/utils/unittest/googletest/include \
+                -DGTEST_HAS_RTTI=0 -DGTEST_USE_OWN_TR1_TUPLE \
+                $< -o $@
+
 $(OBJS): | $(OBJDIR)
 
+$(UNITTEST_OBJS): | $(OBJDIR)/unittest
+
 $(OBJDIR):
         @mkdir -p $@
 
+$(OBJDIR)/unittest: $(OBJDIR)
+        @mkdir -p $@
+
 check-lit: llvm2ice make_symlink
         LLVM_BIN_PATH=$(LLVM_BIN_PATH) \
         $(LLVM_SRC_PATH)/utils/lit/lit.py -sv tests_lit
 
+check-unit: $(OBJDIR)/run_unittests
+        $(OBJDIR)/run_unittests
+
 ifdef MINIMAL
-check: check-lit
+check: check-lit check-unit
         @echo "Crosstests ignored, minimal build"
 else
-check: check-lit
+check: check-lit check-unit
         (cd crosstest; ./runtests.sh)
 endif
 
 # TODO: Fix the use of wildcards.
 # Assumes clang-format is within $PATH.
 format:
         clang-format -style=LLVM -i src/*.h src/*.cpp
 
 # Assumes clang-format-diff.py is within $PATH, and that the
 # clang-format it calls is also within $PATH.  This may require adding
 # a component to $PATH, or creating symlinks within some existing
 # $PATH component.  Uses the one in /usr/lib/clang-format/ if it
 # exists.
 ifeq (,$(wildcard /usr/lib/clang-format/clang-format-diff.py))
   CLANG_FORMAT_DIFF = clang-format-diff.py
 else
   CLANG_FORMAT_DIFF = /usr/lib/clang-format/clang-format-diff.py
 endif
 format-diff:
         git diff -U0 `git merge-base HEAD master` | \
         $(CLANG_FORMAT_DIFF) -p1 -style=LLVM -i
 
 clean:
         rm -rf llvm2ice *.o $(OBJDIR)
 
 clean-all: clean
         rm -rf build/