support embedded resources on darwin via binaryToMacho.cpp

makefile

@@ -84,6 +84,7 @@ ifeq ($(platform),darwin)
 		-I$(JAVA_HOME)/include/linux -I$(src)
 	lflags = $(common-lflags) -ldl
 	strip-all = -S -x
+	binaryToMacho = $(native-build)/binaryToMacho
 endif
 
 ifeq ($(platform),windows)
@@ -198,10 +199,6 @@ classpath-classes = \
 classpath-object = $(native-build)/classpath-jar.o
 classpath-dep = $(classpath-build)/dep
 
-ifeq ($(platform),darwin)
-	classpath-object =
-endif
-
 test-sources = $(wildcard $(test)/*.java)
 test-classes = $(call java-classes,$(test-sources),$(test),$(test-build))
 test-dep = $(test-build)/dep
@@ -209,11 +206,7 @@ test-dep = $(test-build)/dep
 class-name = $(patsubst $(1)/%.class,%,$(2))
 class-names = $(foreach x,$(2),$(call class-name,$(1),$(x)))
 
-ifeq ($(platform),darwin)
-	flags = -cp $(classpath-build):$(test-build)
-else
-	flags = -cp $(test-build)
-endif
+flags = -cp $(test-build)
 
 args = $(flags) $(input)
 
@@ -299,11 +292,19 @@ $(build)/classpath.jar: $(classpath-dep)
 	 cd $(classpath-build); \
 	 $(jar) c0f $${wd}/$(@) $$(find . -name '*.class'))
 
-$(classpath-object): $(build)/classpath.jar
+$(binaryToMacho): $(src)/binaryToMacho.cpp
+	$(cxx) $(^) -o $(@)
+
+$(classpath-object): $(build)/classpath.jar $(binaryToMacho)
+ifeq ($(platform),darwin)
+	$(binaryToMacho) $(build)/classpath.jar \
+		__binary_classpath_jar_data __binary_classpath_jar_size > $(@)
+else
 	(wd=$$(pwd); \
 	 cd $(build); \
 	 $(objcopy) -I binary classpath.jar \
 		 -O $(object-format) -B $(object-arch) $${wd}/$(@))
+endif
 
 $(generator-objects): $(native-build)/%.o: $(src)/%.cpp
 	@echo "compiling $(@)"

src/binaryToMacho.cpp

@@ -0,0 +1,158 @@
+#include "stdint.h"
+#include "stdio.h"
+#include "string.h"
+
+#include "sys/stat.h"
+#include "sys/mman.h"
+#include "fcntl.h"
+#include "unistd.h"
+
+#include "mach-o/loader.h"
+#include "mach-o/nlist.h"
+
+namespace {
+
+inline unsigned
+pad(unsigned n)
+{
+  return (n + (4 - 1)) & ~(4 - 1);
+}
+
+void
+writeObject(FILE* out, const uint8_t* data, unsigned size,
+            const char* dataName, const char* sizeName)
+{
+  unsigned dataNameLength = strlen(dataName) + 1;
+  unsigned sizeNameLength = strlen(sizeName) + 1;
+
+  mach_header header = {
+    MH_MAGIC, // magic
+    CPU_TYPE_I386, // cputype
+    CPU_SUBTYPE_I386_ALL, // cpusubtype
+    MH_OBJECT, // filetype,
+    2, // ncmds
+    sizeof(segment_command)
+    + sizeof(section)
+    + sizeof(symtab_command), // sizeofcmds
+    0 // flags
+  };
+  
+  segment_command segment = {
+    LC_SEGMENT, // cmd
+    sizeof(segment_command) + sizeof(section), // cmdsize
+    "__TEXT", // segname
+    0, // vmaddr
+    pad(size), // vmsize
+    sizeof(mach_header)
+    + sizeof(segment_command)
+    + sizeof(section)
+    + sizeof(symtab_command), // fileoff
+    pad(size), // filesize
+    7, // maxprot
+    7, // initprot
+    1, // nsects
+    0 // flags
+  };
+
+  section sect = {
+    "__const", // sectname
+    "__TEXT", // segname
+    0, // addr
+    pad(size), // size
+    sizeof(mach_header)
+    + sizeof(segment_command)
+    + sizeof(section)
+    + sizeof(symtab_command), // offset
+    0, // align
+    0, // reloff
+    0, // nreloc
+    S_REGULAR, // flags
+    0, // reserved1
+    0, // reserved2
+  };
+
+  symtab_command symbolTable = {
+    LC_SYMTAB, // cmd
+    sizeof(symtab_command), // cmdsize
+    sizeof(mach_header)
+    + sizeof(segment_command)
+    + sizeof(section)
+    + sizeof(symtab_command)
+    + pad(size), // symoff
+    2, // nsyms
+    sizeof(mach_header)
+    + sizeof(segment_command)
+    + sizeof(section)
+    + sizeof(symtab_command)
+    + pad(size)
+    + (sizeof(struct nlist) * 2), // stroff
+    1 + dataNameLength + sizeNameLength, // strsize
+  };
+
+  struct nlist symbolList[] = {
+    {
+      reinterpret_cast<char*>(1), // n_un
+      N_SECT | N_EXT, // n_type
+      1, // n_sect
+      0, // n_desc
+      0 // n_value
+    },
+    {
+      reinterpret_cast<char*>(1 + dataNameLength), // n_un
+      N_ABS | N_EXT, // n_type
+      NO_SECT, // n_sect
+      0, // n_desc
+      size // n_value
+    }
+  };
+
+  fwrite(&header, 1, sizeof(header), out);
+  fwrite(&segment, 1, sizeof(segment), out);
+  fwrite(&sect, 1, sizeof(sect), out);
+  fwrite(&symbolTable, 1, sizeof(symbolTable), out);
+
+  fwrite(data, 1, size, out);
+  for (unsigned i = 0; i < pad(size) - size; ++i) fputc(0, out);
+
+  fwrite(&symbolList, 1, sizeof(symbolList), out);
+
+  fputc(0, out);
+  fwrite(dataName, 1, dataNameLength, out);
+  fwrite(sizeName, 1, sizeNameLength, out);
+}
+
+} // namespace
+
+int
+main(int argc, const char** argv)
+{
+  if (argc != 4) {
+    fprintf(stderr,
+            "usage: %s <input file> <data symbol name> <size symbol name>\n",
+            argv[0]);
+    return -1;
+  }
+
+  uint8_t* data = 0;
+  unsigned size;
+  int fd = open(argv[1], O_RDONLY);
+  if (fd != -1) {
+    struct stat s;
+    int r = fstat(fd, &s);
+    if (r != -1) {
+      data = static_cast<uint8_t*>
+        (mmap(0, s.st_size, PROT_READ, MAP_PRIVATE, fd, 0));
+      size = s.st_size;
+    }
+    close(fd);
+  }
+
+  if (data) {
+    writeObject(stdout, data, size, argv[2], argv[3]);
+    munmap(data, size);
+    return 0;
+  } else {
+    perror(argv[0]);
+    return -1;
+  }
+}