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#include "master.hpp"
namespace factor
{
context::context(cell datastack_size, cell retainstack_size, cell callstack_size) :
callstack_top(NULL),
callstack_bottom(NULL),
datastack(0),
retainstack(0),
callstack_save(0),
datastack_seg(new segment(datastack_size,false)),
retainstack_seg(new segment(retainstack_size,false)),
callstack_seg(new segment(callstack_size,false))
{
reset();
}
void context::reset_datastack()
{
datastack = datastack_seg->start - sizeof(cell);
}
void context::reset_retainstack()
{
retainstack = retainstack_seg->start - sizeof(cell);
}
void context::reset_callstack()
{
callstack_top = callstack_bottom = CALLSTACK_BOTTOM(this);
}
void context::reset_context_objects()
{
memset_cell(context_objects,false_object,context_object_count * sizeof(cell));
}
void context::reset()
{
reset_datastack();
reset_retainstack();
reset_callstack();
reset_context_objects();
}
void context::fix_stacks()
{
if(datastack + sizeof(cell) < datastack_seg->start
|| datastack + stack_reserved >= datastack_seg->end)
reset_datastack();
if(retainstack + sizeof(cell) < retainstack_seg->start
|| retainstack + stack_reserved >= retainstack_seg->end)
reset_retainstack();
}
void context::scrub_stacks(gc_info *info, cell index)
{
u8 *bitmap = info->gc_info_bitmap();
{
cell base = info->scrub_d_base(index);
for(int loc = 0; loc < info->scrub_d_count; loc++)
{
if(bitmap_p(bitmap,base + loc))
{
#ifdef DEBUG_GC_MAPS
std::cout << "scrubbing datastack location " << loc << std::endl;
#endif
*((cell *)datastack - loc) = 0;
}
}
}
{
cell base = info->scrub_r_base(index);
for(int loc = 0; loc < info->scrub_r_count; loc++)
{
if(bitmap_p(bitmap,base + loc))
{
#ifdef DEBUG_GC_MAPS
std::cout << "scrubbing retainstack location " << loc << std::endl;
#endif
*((cell *)retainstack - loc) = 0;
}
}
}
}
context::~context()
{
delete datastack_seg;
delete retainstack_seg;
delete callstack_seg;
}
/* called on startup */
void factor_vm::init_contexts(cell datastack_size_, cell retainstack_size_, cell callstack_size_)
{
datastack_size = datastack_size_;
retainstack_size = retainstack_size_;
callstack_size = callstack_size_;
ctx = NULL;
spare_ctx = new_context();
}
void factor_vm::delete_contexts()
{
assert(!ctx);
std::list<context *>::const_iterator iter = unused_contexts.begin();
std::list<context *>::const_iterator end = unused_contexts.end();
while(iter != end)
{
delete *iter;
iter++;
}
}
context *factor_vm::new_context()
{
context *new_context;
if(unused_contexts.empty())
{
new_context = new context(datastack_size,
retainstack_size,
callstack_size);
}
else
{
new_context = unused_contexts.back();
unused_contexts.pop_back();
}
new_context->reset();
active_contexts.insert(new_context);
return new_context;
}
void factor_vm::init_context(context *ctx)
{
ctx->context_objects[OBJ_CONTEXT] = allot_alien(ctx);
}
context *new_context(factor_vm *parent)
{
context *new_context = parent->new_context();
parent->init_context(new_context);
return new_context;
}
void factor_vm::delete_context(context *old_context)
{
unused_contexts.push_back(old_context);
active_contexts.erase(old_context);
while(unused_contexts.size() > 10)
{
context *stale_context = unused_contexts.front();
unused_contexts.pop_front();
delete stale_context;
}
}
VM_C_API void delete_context(factor_vm *parent, context *old_context)
{
parent->delete_context(old_context);
}
VM_C_API void reset_context(factor_vm *parent, context *ctx)
{
ctx->reset();
parent->init_context(ctx);
}
cell factor_vm::begin_callback(cell quot_)
{
data_root<object> quot(quot_,this);
ctx->reset();
spare_ctx = new_context();
callback_ids.push_back(callback_id++);
init_context(ctx);
return quot.value();
}
cell begin_callback(factor_vm *parent, cell quot)
{
return parent->begin_callback(quot);
}
void factor_vm::end_callback()
{
callback_ids.pop_back();
delete_context(ctx);
}
void end_callback(factor_vm *parent)
{
parent->end_callback();
}
void factor_vm::primitive_current_callback()
{
ctx->push(tag_fixnum(callback_ids.back()));
}
void factor_vm::primitive_context_object()
{
fixnum n = untag_fixnum(ctx->peek());
ctx->replace(ctx->context_objects[n]);
}
void factor_vm::primitive_set_context_object()
{
fixnum n = untag_fixnum(ctx->pop());
cell value = ctx->pop();
ctx->context_objects[n] = value;
}
void factor_vm::primitive_context_object_for()
{
context *other_ctx = (context *)pinned_alien_offset(ctx->pop());
fixnum n = untag_fixnum(ctx->pop());
ctx->push(other_ctx->context_objects[n]);
}
cell factor_vm::stack_to_array(cell bottom, cell top)
{
fixnum depth = (fixnum)(top - bottom + sizeof(cell));
if(depth < 0)
return false_object;
else
{
array *a = allot_uninitialized_array<array>(depth / sizeof(cell));
memcpy(a + 1,(void*)bottom,depth);
return tag<array>(a);
}
}
cell factor_vm::datastack_to_array(context *ctx)
{
cell array = stack_to_array(ctx->datastack_seg->start,ctx->datastack);
if(array == false_object)
{
general_error(ERROR_DATASTACK_UNDERFLOW,false_object,false_object);
return false_object;
}
else
return array;
}
void factor_vm::primitive_datastack()
{
ctx->push(datastack_to_array(ctx));
}
void factor_vm::primitive_datastack_for()
{
context *other_ctx = (context *)pinned_alien_offset(ctx->pop());
ctx->push(datastack_to_array(other_ctx));
}
cell factor_vm::retainstack_to_array(context *ctx)
{
cell array = stack_to_array(ctx->retainstack_seg->start,ctx->retainstack);
if(array == false_object)
{
general_error(ERROR_RETAINSTACK_UNDERFLOW,false_object,false_object);
return false_object;
}
else
return array;
}
void factor_vm::primitive_retainstack()
{
ctx->push(retainstack_to_array(ctx));
}
void factor_vm::primitive_retainstack_for()
{
context *other_ctx = (context *)pinned_alien_offset(ctx->pop());
ctx->push(retainstack_to_array(other_ctx));
}
/* returns pointer to top of stack */
cell factor_vm::array_to_stack(array *array, cell bottom)
{
cell depth = array_capacity(array) * sizeof(cell);
memcpy((void*)bottom,array + 1,depth);
return bottom + depth - sizeof(cell);
}
void factor_vm::set_datastack(context *ctx, array *array)
{
ctx->datastack = array_to_stack(array,ctx->datastack_seg->start);
}
void factor_vm::primitive_set_datastack()
{
set_datastack(ctx,untag_check<array>(ctx->pop()));
}
void factor_vm::set_retainstack(context *ctx, array *array)
{
ctx->retainstack = array_to_stack(array,ctx->retainstack_seg->start);
}
void factor_vm::primitive_set_retainstack()
{
set_retainstack(ctx,untag_check<array>(ctx->pop()));
}
/* Used to implement call( */
void factor_vm::primitive_check_datastack()
{
fixnum out = to_fixnum(ctx->pop());
fixnum in = to_fixnum(ctx->pop());
fixnum height = out - in;
array *saved_datastack = untag_check<array>(ctx->pop());
fixnum saved_height = array_capacity(saved_datastack);
fixnum current_height = (ctx->datastack - ctx->datastack_seg->start + sizeof(cell)) / sizeof(cell);
if(current_height - height != saved_height)
ctx->push(false_object);
else
{
cell *ds_bot = (cell *)ctx->datastack_seg->start;
for(fixnum i = 0; i < saved_height - in; i++)
{
if(ds_bot[i] != array_nth(saved_datastack,i))
{
ctx->push(false_object);
return;
}
}
ctx->push(true_object);
}
}
void factor_vm::primitive_load_locals()
{
fixnum count = untag_fixnum(ctx->pop());
memcpy((cell *)(ctx->retainstack + sizeof(cell)),
(cell *)(ctx->datastack - sizeof(cell) * (count - 1)),
sizeof(cell) * count);
ctx->datastack -= sizeof(cell) * count;
ctx->retainstack += sizeof(cell) * count;
}
}
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