Change C++ exception usage back into a longjmp() due to GCC bugs

Makefile

@@ -60,6 +60,7 @@ DLL_OBJS = $(PLAF_DLL_OBJS) \
 	vm/strings.o \
 	vm/tuples.o \
 	vm/utilities.o \
+        vm/vm.o \
 	vm/words.o \
 	vm/write_barrier.o
 

vm/data_gc.cpp

@@ -12,18 +12,16 @@ gc_state::gc_state(data_heap *data_, bool growing_data_heap_, cell collecting_ge
 	data(data_),
 	growing_data_heap(growing_data_heap_),
 	collecting_gen(collecting_gen_),
+        collecting_aging_again(false),
 	start_time(current_micros()) { }
 
 gc_state::~gc_state() { }
 
-/* If a generation fills up, throw this error. It is caught in garbage_collection() */
-struct generation_full_condition { };
-
 /* Given a pointer to oldspace, copy it to newspace */
 object *factor_vm::copy_untagged_object_impl(object *pointer, cell size)
 {
 	if(current_gc->newspace->here + size >= current_gc->newspace->end)
-		throw generation_full_condition();
+		longjmp(current_gc->gc_unwind,1);
 
 	object *newpointer = allot_zone(current_gc->newspace,size);
 
@@ -502,7 +500,6 @@ void factor_vm::begin_gc(cell requested_bytes)
 
 void factor_vm::end_gc()
 {
-
 	gc_stats *s = &stats[current_gc->collecting_gen];
 
 	cell gc_elapsed = (current_micros() - current_gc->start_time);
@@ -545,10 +542,34 @@ void factor_vm::garbage_collection(cell collecting_gen_, bool growing_data_heap_
 
 	/* Keep trying to GC higher and higher generations until we don't run out
 	of space */
-	for(;;)
+        if(setjmp(current_gc->gc_unwind))
         {
-		try
+                /* We come back here if a generation is full */
+
+                /* We have no older generations we can try collecting, so we
+                resort to growing the data heap */
+                if(current_gc->collecting_tenured_p())
                 {
+                        current_gc->growing_data_heap = true;
+
+                        /* see the comment in unmark_marked() */
+                        code->unmark_marked();
+                }
+                /* we try collecting aging space twice before going on to
+                collect tenured */
+                else if(data->have_aging_p()
+                        && current_gc->collecting_gen == data->aging()
+                        && !current_gc->collecting_aging_again)
+                {
+                        current_gc->collecting_aging_again = true;
+                }
+                /* Collect the next oldest generation */
+                else
+                {
+                        current_gc->collecting_gen++;
+                }
+        }
+
         begin_gc(requested_bytes);
 
         /* Initialize chase pointer */
@@ -585,37 +606,6 @@ void factor_vm::garbage_collection(cell collecting_gen_, bool growing_data_heap_
                 update_dirty_code_blocks();
 
         /* GC completed without any generations filling up; finish up */
-			break;
-		}
-		catch(const generation_full_condition &c)
-		{
-			/* We come back here if a generation is full */
-
-			/* We have no older generations we can try collecting, so we
-			resort to growing the data heap */
-			if(current_gc->collecting_tenured_p())
-			{
-				current_gc->growing_data_heap = true;
-
-				/* see the comment in unmark_marked() */
-				code->unmark_marked();
-			}
-			/* we try collecting aging space twice before going on to
-			collect tenured */
-			else if(data->have_aging_p()
-				&& current_gc->collecting_gen == data->aging()
-				&& !current_gc->collecting_aging_again)
-			{
-				current_gc->collecting_aging_again = true;
-			}
-			/* Collect the next oldest generation */
-			else
-			{
-				current_gc->collecting_gen++;
-			}
-		}
-	}
-
 	end_gc();
 
 	delete current_gc;

vm/data_gc.hpp

@@ -34,6 +34,8 @@ struct gc_state {
 	/* GC start time, for benchmarking */
 	u64 start_time;
 
+        jmp_buf gc_unwind;
+
 	explicit gc_state(data_heap *data_, bool growing_data_heap_, cell collecting_gen_);
 	~gc_state();
 

vm/generic_arrays.hpp

@@ -4,7 +4,7 @@ namespace factor
 template<typename Array> cell array_capacity(Array *array)
 {
 #ifdef FACTOR_DEBUG
-	assert(array->h.hi_tag() == T::type_number);
+	assert(array->h.hi_tag() == Array::type_number);
 #endif
 	return array->capacity >> TAG_BITS;
 }

vm/os-windows-nt.cpp

@@ -46,7 +46,8 @@ LONG factor_vm::exception_handler(PEXCEPTION_POINTERS pe)
 	else
 		signal_callstack_top = NULL;
 
-    switch (e->ExceptionCode) {
+        switch (e->ExceptionCode)
+        {
         case EXCEPTION_ACCESS_VIOLATION:
 		signal_fault_addr = e->ExceptionInformation[1];
 		c->EIP = (cell)factor::memory_signal_handler_impl;

vm/quotations.cpp

@@ -330,6 +330,7 @@ void factor_vm::compile_all_words()
 
 	}
 
+        printf("done\n");
 	/* Update XTs in code heap */
 	word_updater updater(this);
 	iterate_code_heap(updater);

vm/vm.cpp

@@ -0,0 +1,11 @@
+#include "master.hpp"
+
+namespace factor
+{
+
+factor_vm::factor_vm()
+{
+        memset(this,0,sizeof(factor_vm));
+}
+
+}

vm/vm.hpp

@@ -535,7 +535,6 @@ struct factor_vm
 	//code_heap
 	heap *code;
 	unordered_map<heap_block *, char *> forwarding;
-	typedef void (factor_vm::*code_heap_iterator)(code_block *compiled);
 
 	void init_code_heap(cell size);
 	bool in_code_heap_p(cell ptr);
@@ -743,16 +742,7 @@ struct factor_vm
 	void call_fault_handler(exception_type_t exception, exception_data_type_t code, MACH_EXC_STATE_TYPE *exc_state, MACH_THREAD_STATE_TYPE *thread_state, MACH_FLOAT_STATE_TYPE *float_state);
   #endif
 
-	factor_vm() 
-		: profiling_p(false),
-		  secure_gc(false),
-		  gc_off(false),
-		  fep_disabled(false),
-		  full_output(false),
-		  max_pic_size(0)
-	{
-		memset(this,0,sizeof(this)); // just to make sure
-	}
+	factor_vm();
 
 };