Use a global to store the build context information

src/build_settings.c

@@ -0,0 +1,234 @@
+typedef struct BuildContext {
+	String ODIN_OS;      // target operating system
+	String ODIN_ARCH;    // target architecture
+	String ODIN_ENDIAN;  // target endian
+	String ODIN_VENDOR;  // compiler vendor
+	String ODIN_VERSION; // compiler version
+	String ODIN_ROOT;    // Odin ROOT
+
+	i64    word_size;
+	i64    max_align;
+	String llc_flags;
+	String link_flags;
+	bool   is_dll;
+} BuildContext;
+
+
+gb_global BuildContext build_context = {0};
+
+
+
+// TODO(bill): OS dependent versions for the BuildContext
+// join_path
+// is_dir
+// is_file
+// is_abs_path
+// has_subdir
+
+String const WIN32_SEPARATOR_STRING = {cast(u8 *)"\\", 1};
+String const NIX_SEPARATOR_STRING   = {cast(u8 *)"/",  1};
+
+#if defined(GB_SYSTEM_WINDOWS)
+String odin_root_dir(void) {
+	String path = global_module_path;
+	Array(wchar_t) path_buf;
+	isize len, i;
+	gbTempArenaMemory tmp;
+	wchar_t *text;
+
+	if (global_module_path_set) {
+		return global_module_path;
+	}
+
+	array_init_count(&path_buf, heap_allocator(), 300);
+
+	len = 0;
+	for (;;) {
+		len = GetModuleFileNameW(NULL, &path_buf.e[0], path_buf.count);
+		if (len == 0) {
+			return make_string(NULL, 0);
+		}
+		if (len < path_buf.count) {
+			break;
+		}
+		array_resize(&path_buf, 2*path_buf.count + 300);
+	}
+
+	tmp = gb_temp_arena_memory_begin(&string_buffer_arena);
+
+	text = gb_alloc_array(string_buffer_allocator, wchar_t, len+1);
+
+	GetModuleFileNameW(NULL, text, len);
+	path = string16_to_string(heap_allocator(), make_string16(text, len));
+	for (i = path.len-1; i >= 0; i--) {
+		u8 c = path.text[i];
+		if (c == '/' || c == '\\') {
+			break;
+		}
+		path.len--;
+	}
+
+	global_module_path = path;
+	global_module_path_set = true;
+
+	gb_temp_arena_memory_end(tmp);
+
+	array_free(&path_buf);
+
+	return path;
+}
+
+#elif defined(GB_SYSTEM_OSX)
+
+#include <mach-o/dyld.h>
+
+String odin_root_dir(void) {
+	String path = global_module_path;
+	Array(char) path_buf;
+	isize len, i;
+	gbTempArenaMemory tmp;
+	wchar_t *text;
+
+	if (global_module_path_set) {
+		return global_module_path;
+	}
+
+	array_init_count(&path_buf, heap_allocator(), 300);
+
+	len = 0;
+	for (;;) {
+		int sz = path_buf.count;
+		int res = _NSGetExecutablePath(&path_buf.e[0], &sz);
+		if(res == 0) {
+			len = sz;
+			break;
+		} else {
+			array_resize(&path_buf, sz + 1);
+		}
+	}
+
+
+	tmp = gb_temp_arena_memory_begin(&string_buffer_arena);
+	text = gb_alloc_array(string_buffer_allocator, u8, len + 1);
+	gb_memmove(text, &path_buf.e[0], len);
+
+	path = make_string(text, len);
+	for (i = path.len-1; i >= 0; i--) {
+		u8 c = path.text[i];
+		if (c == '/' || c == '\\') {
+			break;
+		}
+		path.len--;
+	}
+
+	global_module_path = path;
+	global_module_path_set = true;
+
+	gb_temp_arena_memory_end(tmp);
+
+	// array_free(&path_buf);
+
+	return path;
+}
+#else
+#error Implement system
+#endif
+
+
+#if defined(GB_SYSTEM_WINDOWS)
+String path_to_fullpath(gbAllocator a, String s) {
+	gbTempArenaMemory tmp = gb_temp_arena_memory_begin(&string_buffer_arena);
+	String16 string16 = string_to_string16(string_buffer_allocator, s);
+	String result = {0};
+
+	DWORD len = GetFullPathNameW(string16.text, 0, NULL, NULL);
+	if (len != 0) {
+		wchar_t *text = gb_alloc_array(string_buffer_allocator, wchar_t, len+1);
+		GetFullPathNameW(string16.text, len, text, NULL);
+		text[len] = 0;
+		result = string16_to_string(a, make_string16(text, len));
+	}
+	gb_temp_arena_memory_end(tmp);
+	return result;
+}
+#elif defined(GB_SYSTEM_OSX) || defined(GB_SYSTEM_UNIX)
+String path_to_fullpath(gbAllocator a, String s) {
+	char* p = realpath(s.text, 0);
+	// GB_ASSERT(p && "file does not exist");
+	if(!p) return make_string_c("");
+
+	return make_string(p, strlen(p));
+}
+#else
+#error Implement system
+#endif
+
+
+String get_fullpath_relative(gbAllocator a, String base_dir, String path) {
+	String res = {0};
+	isize str_len = base_dir.len+path.len;
+
+	u8 *str = gb_alloc_array(heap_allocator(), u8, str_len+1);
+
+	isize i = 0;
+	gb_memmove(str+i, base_dir.text, base_dir.len); i += base_dir.len;
+	gb_memmove(str+i, path.text, path.len);
+	str[str_len] = '\0';
+	res = path_to_fullpath(a, make_string(str, str_len));
+	gb_free(heap_allocator(), str);
+	return res;
+}
+
+String get_fullpath_core(gbAllocator a, String path) {
+	String module_dir = odin_root_dir();
+	String res = {0};
+
+	char core[] = "core/";
+	isize core_len = gb_size_of(core)-1;
+
+	isize str_len = module_dir.len + core_len + path.len;
+	u8 *str = gb_alloc_array(heap_allocator(), u8, str_len+1);
+
+	gb_memmove(str, module_dir.text, module_dir.len);
+	gb_memmove(str+module_dir.len, core, core_len);
+	gb_memmove(str+module_dir.len+core_len, path.text, path.len);
+	str[str_len] = '\0';
+
+	res = path_to_fullpath(a, make_string(str, str_len));
+	gb_free(heap_allocator(), str);
+	return res;
+}
+
+
+
+
+void init_build_context(void) {
+	BuildContext *bc = &build_context;
+	bc->ODIN_VENDOR  = str_lit("odin");
+	bc->ODIN_VERSION = str_lit("0.1.1");
+	bc->ODIN_ROOT    = odin_root_dir();
+
+#if defined(GB_SYSTEM_WINDOWS)
+	bc->ODIN_OS      = str_lit("windows");
+	bc->ODIN_ARCH    = str_lit("amd64");
+	bc->ODIN_ENDIAN  = str_lit("little");
+#elif defined(GB_SYSTEM_OSX)
+	bc->ODIN_OS      = str_lit("osx");
+	bc->ODIN_ARCH    = str_lit("amd64");
+	bc->ODIN_ENDIAN  = str_lit("little");
+#else
+#error Implement system
+#endif
+
+	if (str_eq(bc->ODIN_ARCH, str_lit("amd64"))) {
+		bc->word_size = 8;
+		bc->max_align = 16;
+		bc->llc_flags = str_lit("-march=x86-64 ");
+		bc->link_flags = str_lit("/machine:x64 ");
+	} else if (str_eq(bc->ODIN_ARCH, str_lit("x86"))) {
+		bc->word_size = 4;
+		bc->max_align = 8;
+		bc->llc_flags = str_lit("-march=x86 ");
+		bc->link_flags = str_lit("/machine:x86 ");
+	}
+}