/**
* Gets a loaded infusion for a given infusion name.
* @param vm the virtual machine to lookup the infusion in
* @param name the name of the infusion. Has to be a NULL-terminated ascii string in program memory.
* @return the infusion for the given name, or NULL if no such infusion is found
*/
dj_infusion *dj_vm_lookupInfusion(dj_vm *vm, dj_di_pointer name)
{
dj_infusion *finger = vm->infusions;
while (finger!=NULL)
{
if (dj_di_strEquals(dj_di_header_getInfusionName(finger->header), name)) return finger;
finger = finger->next;
}
return NULL;
}
/**
* Loads an infusion into the virtual machine.
* @param vm the virtual machine object to load the infusion into
* @param di a di pointer to the infusion file in program space
* @return a newly loaded infusion, or NULL in case of fail
*/
dj_infusion *dj_vm_loadInfusion(dj_vm *vm, dj_di_pointer di, dj_named_native_handler native_handlers[], unsigned char numHandlers)
{
int i;
dj_infusion *infusion;
dj_di_pointer element;
dj_di_pointer staticFieldInfo = DJ_DI_NOT_SET;
dj_di_pointer infusionList = DJ_DI_NOT_SET;
dj_thread * thread;
dj_global_id entryPoint;
// iterate over the child elements, and find the static
// field size info block. We need this info to allocate
// the memory to hold the static fields for this
// infusion
for (i=0; i<dj_di_getListSize(di); i++)
{
element = dj_di_getListElement(di, i);
switch (dj_di_element_getId(element))
{
case STATICFIELDINFO:
staticFieldInfo = element;
break;
case INFUSIONLIST:
infusionList = element;
break;
}
}
// Check if each of the required elements were found
if (staticFieldInfo==DJ_DI_NOT_SET||infusionList==DJ_DI_NOT_SET)
dj_panic(DJ_PANIC_MALFORMED_INFUSION);
// allocate the Infusion struct
infusion = dj_infusion_create(staticFieldInfo, dj_di_infusionList_getSize(infusionList));
// if we're out of memory, let the caller handle it
if (infusion==NULL) return NULL;
// iterate over the child elements and get references
// to the class list and method implementation list,
// and get the header
for (i=0; i<dj_di_getListSize(di); i++)
{
element = dj_di_getListElement(di, i);
switch (dj_di_element_getId(element))
{
case HEADER:
infusion->header = element;
break;
case CLASSLIST:
infusion->classList = element;
break;
case METHODIMPLLIST:
infusion->methodImplementationList = element;
break;
case STRINGTABLE:
infusion->stringTable = element;
break;
}
}
// Check if each of the required elements was found
if (infusion->stringTable==DJ_DI_NOT_SET||infusion->classList==DJ_DI_NOT_SET||infusion->methodImplementationList==DJ_DI_NOT_SET||infusion->header==DJ_DI_NOT_SET)
dj_panic(DJ_PANIC_MALFORMED_INFUSION);
// iterate over the referenced infusion list and set the appropriate pointers
for (i=0; i<dj_di_infusionList_getSize(infusionList); i++)
{
dj_di_pointer name = dj_di_infusionList_getChild(infusionList, i);
dj_infusion *referenced_infusion = dj_vm_lookupInfusion(vm, name);
if (infusion==NULL)
dj_panic(DJ_PANIC_UNSATISFIED_LINK);
infusion->referencedInfusions[i] = referenced_infusion;
}
// add the new infusion to the VM
dj_vm_addInfusion(vm, infusion);
// We're assuming here that base.di is the first file in the archive
if (vm->systemInfusion == NULL)
vm->systemInfusion = infusion;
// This code was originally in load dj_vm_loadInfusionArchive.
// Moved here because the application is not in an archive, but needs
// some of the same code (not native_handlers, but class initialisers
// and creating a thread)
#ifdef DARJEELING_DEBUG
char name[64];
dj_infusion_getName(infusion, name, 64);
DEBUG_LOG(DBG_DARJEELING, "Loaded infusion %s.", name);
#endif
for (i=0; i<numHandlers; i++)
{
if (dj_di_strEqualsDirectStr(dj_di_header_getInfusionName(infusion->header), native_handlers[i].name))
{
infusion->native_handler = native_handlers[i].handler;
#ifdef DARJEELING_DEBUG
DEBUG_LOG(DBG_DARJEELING, "Attached native handler to infusion %s.", name);
#endif
}
}
// run class initialisers for this infusion
infusion = dj_vm_runClassInitialisers(vm, infusion);
// find the entry point for the infusion
if ((entryPoint.entity_id=dj_di_header_getEntryPoint(infusion->header))!=255)
{
// create a new thread and add it to the VM
entryPoint.infusion = infusion;
thread = dj_thread_create_and_run(entryPoint);
if (thread==NULL)
dj_panic(DJ_PANIC_OUT_OF_MEMORY);
dj_vm_addThread(vm, thread);
}
return infusion;
}
// TODO niels clean up this function
dj_infusion* dj_vm_runClassInitialisers(dj_vm *vm, dj_infusion *infusion)
{
int i, threadId;
dj_thread * thread;
dj_frame * frame;
dj_global_id methodImplId;
uint8_t infusionId;
// store infusion ID so that we can get an up-to-date infusion pointer later
infusionId = dj_vm_getInfusionId(vm, infusion);
// create a new thread object to run the <CLINIT> methods in
thread = dj_thread_create();
infusion = dj_vm_getInfusion(vm, infusionId);
if (thread == NULL)
{
DARJEELING_PRINTF("Not enough space for class initializer in infusion %s\n", (char *) dj_di_header_getInfusionName(infusion->header));
dj_panic(DJ_PANIC_OUT_OF_MEMORY);
}
dj_vm_addThread(dj_exec_getVM(), thread);
threadId = thread->id;
// iterate over the class list and execute any class initialisers that are encountered
int size = dj_di_parentElement_getListSize(infusion->classList);
for (i=0; i<size; i++)
{
infusion = dj_vm_getInfusion(dj_exec_getVM(), infusionId);
dj_di_pointer classDef = dj_di_parentElement_getChild(infusion->classList, i);
methodImplId.entity_id = dj_di_classDefinition_getCLInit(classDef);
methodImplId.infusion = infusion;
if (methodImplId.entity_id!=255)
{
// create a frame to run the initialiser in
methodImplId.infusion = infusion;
frame = dj_frame_create(methodImplId);
// if we're out of memory, panic
if (frame==NULL)
{
DEBUG_LOG(DBG_DARJEELING, "dj_vm_runClassInitialisers: could not create frame. Panicking\n");
DARJEELING_PRINTF("Not enough space to create a frame\n");
dj_panic(DJ_PANIC_OUT_OF_MEMORY);
}
// the thread we're running the class initialisers in.
thread = dj_vm_getThreadById(dj_exec_getVM(), threadId);
thread->frameStack = frame;
thread->status = THREADSTATUS_RUNNING;
dj_exec_activate_thread(thread);
// execute the method
while (dj_vm_getThreadById(dj_exec_getVM(), threadId)->status!=THREADSTATUS_FINISHED)
{
// running the CLINIT method may trigger garbage collection
dj_exec_run(RUNSIZE);
}
}
}
// clean up the thread
thread = dj_vm_getThreadById(dj_exec_getVM(), threadId);
dj_vm_removeThread(vm, thread);
dj_thread_destroy(thread);
vm->currentThread = NULL;
return infusion;
}
void dj_vm_loadInfusionArchive(dj_vm * vm, dj_archive* archive, dj_named_native_handler native_handlers[], unsigned char numHandlers)
{
dj_thread * thread;
dj_infusion * infusion = NULL;
dj_di_pointer archive_start = archive->start;
dj_di_pointer archive_end = archive->end;
unsigned char digit, i;
dj_global_id entryPoint;
unsigned long size, pos;
bool first = true;
// skip header, we'll just assume you're not passing something silly into this method
archive_start += 8;
while (archive_start<archive_end-1)
{
// read size
size = 0;
pos = AR_EHEADER_SIZE_START;
while (((digit=dj_di_getU8(archive_start+pos))!=' ')&&(pos<AR_EHEADER_SIZE_END))
{
size *= 10;
size += digit - '0';
pos++;
}
// if filename starts with '/' skip this entry, since it's part of a
// GNU extension on the common AR format
if (dj_di_getU8(archive_start)!='/')
{
// Read infusion file. We're assuming here that base.di is the first file in the archive
if (first)
infusion = dj_vm_loadSystemInfusion(vm, archive_start + AR_EHEADER_SIZE);
else
infusion = dj_vm_loadInfusion(vm, archive_start + AR_EHEADER_SIZE);
// If infusion is not loaded a critical error has occured
if (infusion == NULL){
DARJEELING_PRINTF("Not enough space to create the infusion : %c%c%c%c%c%c%c%c\n",
dj_di_getU8(archive_start+0),
dj_di_getU8(archive_start+1),
dj_di_getU8(archive_start+2),
dj_di_getU8(archive_start+3),
dj_di_getU8(archive_start+4),
dj_di_getU8(archive_start+5),
dj_di_getU8(archive_start+6),
dj_di_getU8(archive_start+7)
);
dj_panic(DJ_PANIC_OUT_OF_MEMORY);
}
/*
else
DARJEELING_PRINTF("[%s.di] %ld\n",
(char *) dj_di_header_getInfusionName(infusion->header),
size
);
*/
#ifdef DARJEELING_DEBUG
char name[64];
dj_infusion_getName(infusion, name, 64);
DEBUG_LOG("Loaded infusion %s.", name);
#endif
for (i=0; i<numHandlers; i++)
{
if (dj_di_strEqualsDirectStr(dj_di_header_getInfusionName(infusion->header), native_handlers[i].name))
{
infusion->native_handler = native_handlers[i].handler;
#ifdef DARJEELING_DEBUG
DEBUG_LOG("Attached native handler to infusion %s.", name);
#endif
}
}
// run class initialisers for this infusion
infusion = dj_vm_runClassInitialisers(vm, infusion);
// find the entry point for the infusion
if ((entryPoint.entity_id=dj_di_header_getEntryPoint(infusion->header))!=255)
{
// create a new thread and add it to the VM
entryPoint.infusion = infusion;
thread = dj_thread_create_and_run(entryPoint);
if (thread==NULL)
dj_panic(DJ_PANIC_OUT_OF_MEMORY);
dj_vm_addThread(vm, thread);
}
first = false;
}
// files are 2-byte aligned
if (size&1) size++;
archive_start += size + AR_EHEADER_SIZE;
}
}