Add American Fuzzy Lop (afl) to third_party/afl/

third_party/afl/src/llvm_mode/Makefile

Index: third_party/afl/src/llvm_mode/Makefile
diff --git a/third_party/afl/src/llvm_mode/Makefile b/third_party/afl/src/llvm_mode/Makefile
new file mode 100644
index 0000000000000000000000000000000000000000..46b3678485df35dc445d4c797ce46c0a22570b6d
--- /dev/null
+++ b/third_party/afl/src/llvm_mode/Makefile
@@ -0,0 +1,112 @@
+#
+# american fuzzy lop - LLVM instrumentation
+# -----------------------------------------
+#
+# Written by Laszlo Szekeres <lszekeres@google.com> and
+#            Michal Zalewski <lcamtuf@google.com>
+#
+# LLVM integration design comes from Laszlo Szekeres.
+#
+# Copyright 2015, 2016 Google Inc. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at:
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+
+PREFIX      ?= /usr/local
+HELPER_PATH  = $(PREFIX)/lib/afl
+BIN_PATH     = $(PREFIX)/bin
+
+VERSION      = $(shell grep ^VERSION ../Makefile | cut -d= -f2 | sed 's/ //')
+
+LLVM_CONFIG ?= llvm-config
+
+CFLAGS      ?= -O3 -funroll-loops
+CFLAGS      += -Wall -D_FORTIFY_SOURCE=2 -g -Wno-pointer-sign \
+               -DAFL_PATH=\"$(HELPER_PATH)\" -DBIN_PATH=\"$(BIN_PATH)\" \
+               -DVERSION=\"$(VERSION)\" 
+ifdef AFL_TRACE_PC
+  CFLAGS    += -DUSE_TRACE_PC=1
+endif
+
+CXXFLAGS    ?= -O3 -funroll-loops
+CXXFLAGS    += -Wall -D_FORTIFY_SOURCE=2 -g -Wno-pointer-sign \
+               -DVERSION=\"$(VERSION)\" -Wno-variadic-macros
+
+CLANG_CFL    = `$(LLVM_CONFIG) --cxxflags` -fno-rtti -fpic $(CXXFLAGS)
+CLANG_LFL    = `$(LLVM_CONFIG) --ldflags` $(LDFLAGS)
+
+# User teor2345 reports that this is required to make things work on MacOS X.
+
+ifeq "$(shell uname)" "Darwin"
+  CLANG_LFL += -Wl,-flat_namespace -Wl,-undefined,suppress
+endif
+
+# We were using llvm-config --bindir to get the location of clang, but
+# this seems to be busted on some distros, so using the one in $PATH is
+# probably better.
+
+ifeq "$(origin CC)" "default"
+  CC         = clang
+  CXX        = clang++
+endif
+
+ifndef AFL_TRACE_PC
+  PROGS      = ../afl-clang-fast ../afl-llvm-pass.so ../afl-llvm-rt.o ../afl-llvm-rt-32.o ../afl-llvm-rt-64.o
+else
+  PROGS      = ../afl-clang-fast ../afl-llvm-rt.o ../afl-llvm-rt-32.o ../afl-llvm-rt-64.o
+endif
+
+all: test_deps $(PROGS) test_build all_done
+
+test_deps:
+ifndef AFL_TRACE_PC
+	@echo "[*] Checking for working 'llvm-config'..."
+	@which $(LLVM_CONFIG) >/dev/null 2>&1 || ( echo "[-] Oops, can't find 'llvm-config'. Install clang or set \$$LLVM_CONFIG or \$$PATH beforehand."; echo "    (Sometimes, the binary will be named llvm-config-3.5 or something like that.)"; exit 1 )
+else
+	@echo "[!] Note: using -fsanitize=trace-pc mode (this will fail with older LLVM)."
+endif
+	@echo "[*] Checking for working '$(CC)'..."
+	@which $(CC) >/dev/null 2>&1 || ( echo "[-] Oops, can't find '$(CC)'. Make sure that it's in your \$$PATH (or set \$$CC and \$$CXX)."; exit 1 )
+	@echo "[*] Checking for '../afl-showmap'..."
+	@test -f ../afl-showmap || ( echo "[-] Oops, can't find '../afl-showmap'. Be sure to compile AFL first."; exit 1 )
+	@echo "[+] All set and ready to build."
+
+../afl-clang-fast: afl-clang-fast.c | test_deps
+	$(CC) $(CFLAGS) $< -o $@ $(LDFLAGS)
+	ln -sf afl-clang-fast ../afl-clang-fast++
+
+../afl-llvm-pass.so: afl-llvm-pass.so.cc | test_deps
+	$(CXX) $(CLANG_CFL) -shared $< -o $@ $(CLANG_LFL)
+
+../afl-llvm-rt.o: afl-llvm-rt.o.c | test_deps
+	$(CC) $(CFLAGS) -fPIC -c $< -o $@
+
+../afl-llvm-rt-32.o: afl-llvm-rt.o.c | test_deps
+	@printf "[*] Building 32-bit variant of the runtime (-m32)... "
+	@$(CC) $(CFLAGS) -m32 -fPIC -c $< -o $@ 2>/dev/null; if [ "$$?" = "0" ]; then echo "success!"; else echo "failed (that's fine)"; fi
+
+../afl-llvm-rt-64.o: afl-llvm-rt.o.c | test_deps
+	@printf "[*] Building 64-bit variant of the runtime (-m64)... "
+	@$(CC) $(CFLAGS) -m64 -fPIC -c $< -o $@ 2>/dev/null; if [ "$$?" = "0" ]; then echo "success!"; else echo "failed (that's fine)"; fi
+
+test_build: $(PROGS)
+	@echo "[*] Testing the CC wrapper and instrumentation output..."
+	unset AFL_USE_ASAN AFL_USE_MSAN AFL_INST_RATIO; AFL_QUIET=1 AFL_PATH=. AFL_CC=$(CC) ../afl-clang-fast $(CFLAGS) ../test-instr.c -o test-instr $(LDFLAGS)
+	echo 0 | ../afl-showmap -m none -q -o .test-instr0 ./test-instr
+	echo 1 | ../afl-showmap -m none -q -o .test-instr1 ./test-instr
+	@rm -f test-instr
+	@cmp -s .test-instr0 .test-instr1; DR="$$?"; rm -f .test-instr0 .test-instr1; if [ "$$DR" = "0" ]; then echo; echo "Oops, the instrumentation does not seem to be behaving correctly!"; echo; echo "Please ping <lcamtuf@google.com> to troubleshoot the issue."; echo; exit 1; fi
+	@echo "[+] All right, the instrumentation seems to be working!"
+
+all_done: test_build
+	@echo "[+] All done! You can now use '../afl-clang-fast' to compile programs."
+
+.NOTPARALLEL: clean
+
+clean:
+	rm -f *.o *.so *~ a.out core core.[1-9][0-9]* test-instr .test-instr0 .test-instr1 
+	rm -f $(PROGS) ../afl-clang-fast++