Fixes to make the open-source build compile on Linux.

Makefile

@@ -101,6 +101,7 @@ CORE= \
 # Library for the protocol buffer format (both text and binary).
 PB= \
   upb/pb/decoder.c \
+  upb/pb/compile_decoder.c \
   upb/pb/glue.c \
   upb/pb/varint.c \
 
@@ -137,7 +138,8 @@ PICOBJ=$(patsubst %.c,%.lo,$(SRC)) $(patsubst %.cc,%.lo,$(SRC))
 
 
 ifdef USE_JIT
-upb/pb/decoder.o upb/pb/decoder.lo: upb/pb/decoder_x64.h
+PB += upb/pb/compile_decoder_x64.c
+upb/pb/compile_decoder_x64.o upb/pb/comiple_decoder_x64.lo: upb/pb/compile_decoder_x64.h
 endif
 $(LIBUPB): $(OBJ)
 	$(E) AR $(LIBUPB)
@@ -172,9 +174,9 @@ upb/def.lo: upb/def.c
 	$(E) 'CC -fPIC' $<
 	$(Q) $(CC) $(CFLAGS) $(CPPFLAGS) $(DEF_OPT) -c -o $@ $< -fPIC
 
-upb/pb/decoder_x64.h: upb/pb/decoder_x64.dasc
+upb/pb/compile_decoder_x64.h: upb/pb/compile_decoder_x64.dasc
 	$(E) DYNASM $<
-	$(Q) $(LUA) dynasm/dynasm.lua upb/pb/decoder_x64.dasc > upb/pb/decoder_x64.h || (rm upb/pb/decoder_x64.h ; false)
+	$(Q) $(LUA) dynasm/dynasm.lua upb/pb/compile_decoder_x64.dasc > upb/pb/compile_decoder_x64.h || (rm upb/pb/compile_decoder_x64.h ; false)
 
 ifneq ($(shell uname), Darwin)
 upb/pb/jit_debug_elf_file.o: upb/pb/jit_debug_elf_file.s
@@ -184,7 +186,7 @@ upb/pb/jit_debug_elf_file.o: upb/pb/jit_debug_elf_file.s
 upb/pb/jit_debug_elf_file.h: upb/pb/jit_debug_elf_file.o
 	$(E) XXD $<
 	$(Q) xxd -i < upb/pb/jit_debug_elf_file.o > upb/pb/jit_debug_elf_file.h
-upb/pb/decoder_x64.h: upb/pb/jit_debug_elf_file.h
+upb/pb/compile_decoder_x64.h: upb/pb/jit_debug_elf_file.h
 endif
 
 # Function to expand a wildcard pattern recursively.
@@ -251,8 +253,8 @@ $(SIMPLE_CXX_TESTS): % : %.cc
 	$(E) CXX $<
 	$(Q) $(CXX) $(CXXFLAGS) $(CPPFLAGS) -o $@ tests/testmain.o $< $(LIBUPB)
 
-#VALGRIND=valgrind --leak-check=full --error-exitcode=1 --track-origins=yes
-VALGRIND=
+VALGRIND=valgrind --leak-check=full --error-exitcode=1 --track-origins=yes
+#VALGRIND=
 test: tests
 	@set -e  # Abort on error.
 	@for test in $(SIMPLE_TESTS) $(SIMPLE_CXX_TESTS); do \

upb/pb/compile_decoder.c

@@ -623,7 +623,7 @@ static void compile_method(compiler *c, upb_pbdecodermethod *method) {
         break;
       default: {
         opcode parse_type = (opcode)type;
-        assert(parse_type >= 0 && parse_type <= OP_MAX);
+        assert((int)parse_type >= 0 && parse_type <= OP_MAX);
         upb_selector_t sel = getsel(f, upb_handlers_getprimitivehandlertype(f));
         int wire_type = native_wire_types[upb_fielddef_descriptortype(f)];
         if (upb_fielddef_isseq(f)) {
@@ -762,6 +762,7 @@ static void sethandlers(upb_pbdecoderplan *p, upb_handlers *h, bool allowjit) {
 
 static bool bind_dynamic(bool allowjit) {
   // Bytecode handlers never bind statically.
+  UPB_UNUSED(allowjit);
   return true;
 }
 
@@ -797,6 +798,7 @@ upb_string_handler *upb_pbdecoderplan_jitcode(const upb_pbdecoderplan *p) {
 #ifdef UPB_USE_JIT_X64
   return p->jit_code;
 #else
+  UPB_UNUSED(p);
   assert(false);
   return NULL;
 #endif

upb/pb/compile_decoder_x64.c

@@ -280,7 +280,9 @@ void upb_pbdecoder_jit(upb_pbdecoderplan *plan) {
 void upb_pbdecoder_freejit(upb_pbdecoderplan *plan) {
   if (!plan->jit_code) return;
   if (plan->dl) {
+#ifdef UPB_JIT_LOAD_SO
     dlclose(plan->dl);
+#endif
   } else {
     munmap(plan->jit_code, plan->jit_size);
   }

upb/pb/decoder.c

@@ -333,6 +333,10 @@ FORCEINLINE int32_t decode_v32(upb_pbdecoder *d, uint32_t *u32) {
   if (ret >= 0) return ret;
   if (u64 > UINT32_MAX) {
     seterr(d, "Unterminated 32-bit varint");
+    // TODO(haberman) guarantee that this function return is >= 0 somehow,
+    // so we know this path will always be treated as error by our caller.
+    // Right now the size_t -> int32_t can overflow and produce negative values.
+    *u32 = 0;
     return upb_pbdecoder_suspend(d);
   }
   *u32 = u64;