bool factor_vm::embedded_image_p() {
const vm_char* vm_path = vm_executable_path();
if (!vm_path)
return false;
FILE* file = OPEN_READ(vm_path);
if (!file)
return false;
embedded_image_footer footer;
bool embedded_p = read_embedded_image_footer(file, &footer);
fclose(file);
return embedded_p;
}
FILE* factor_vm::open_image(vm_parameters* p) {
if (p->embedded_image) {
FILE* file = OPEN_READ(p->executable_path);
if (file == NULL) {
std::cout << "Cannot open embedded image" << std::endl;
char *msg = threadsafe_strerror(errno);
std::cout << "strerror:1: " << msg << std::endl;
free(msg);
exit(1);
}
embedded_image_footer footer;
if (!read_embedded_image_footer(file, &footer)) {
std::cout << "No embedded image" << std::endl;
exit(1);
}
safe_fseek(file, (off_t)footer.image_offset, SEEK_SET);
return file;
} else
return OPEN_READ(p->image_path);
}
// Read an image file from disk, only done once during startup
// This function also initializes the data and code heaps
void factor_vm::load_image(vm_parameters* p) {
FILE* file = OPEN_READ(p->image_path);
if (file == NULL) {
std::cout << "Cannot open image file: " << p->image_path << std::endl;
char *msg = threadsafe_strerror(errno);
std::cout << "strerror:2: " << msg << std::endl;
free(msg);
exit(1);
}
if (p->embedded_image) {
embedded_image_footer footer;
if (!read_embedded_image_footer(file, &footer)) {
std::cout << "No embedded image" << std::endl;
exit(1);
}
safe_fseek(file, (off_t)footer.image_offset, SEEK_SET);
}
image_header h;
if (raw_fread(&h, sizeof(image_header), 1, file) != 1)
fatal_error("Cannot read image header", 0);
if (h.magic != image_magic)
fatal_error("Bad image: magic number check failed", h.magic);
if (h.version != image_version)
fatal_error("Bad image: version number check failed", h.version);
load_data_heap(file, &h, p);
load_code_heap(file, &h, p);
raw_fclose(file);
// Certain special objects in the image are known to the runtime
memcpy(special_objects, h.special_objects, sizeof(special_objects));
cell data_offset = data->tenured->start - h.data_relocation_base;
cell code_offset = code->allocator->start - h.code_relocation_base;
fixup_heaps(data_offset, code_offset);
}
