80 lines
2.0 KiB
C++
80 lines
2.0 KiB
C++
namespace factor {
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// Context object count and identifiers must be kept in sync with:
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// core/kernel/kernel.factor
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static const cell context_object_count = 4;
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enum context_object {
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OBJ_NAMESTACK,
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OBJ_CATCHSTACK,
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OBJ_CONTEXT,
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OBJ_IN_CALLBACK_P,
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};
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// When the callstack fills up (e.g by to deep recursion), a callstack
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// overflow error is triggered. So before continuing executing on it
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// in general_error(), we chop off this many bytes to have some space
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// to work with. Mac OSX 64 bit needs more than 8192. See issue #1419.
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static const cell stack_reserved = 16384;
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struct context {
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// First 5 fields accessed directly by compiler. See basis/vm/vm.factor
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// Factor callstack pointers
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cell callstack_top;
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cell callstack_bottom;
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// current datastack top pointer
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cell datastack;
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// current retain stack top pointer
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cell retainstack;
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// C callstack pointer
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cell callstack_save;
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segment* datastack_seg;
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segment* retainstack_seg;
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segment* callstack_seg;
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// context-specific special objects, accessed by context-object and
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// set-context-object primitives
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cell context_objects[context_object_count];
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context(cell ds_size, cell rs_size, cell cs_size);
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~context();
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void reset_datastack();
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void reset_retainstack();
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void reset_callstack();
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void reset_context_objects();
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void reset();
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void fix_stacks();
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void fill_stack_seg(cell top_ptr, segment* seg, cell pattern);
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vm_error_type address_to_error(cell addr);
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cell peek() { return *(cell*)datastack; }
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void replace(cell tagged) { *(cell*)datastack = tagged; }
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cell pop() {
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cell value = peek();
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datastack -= sizeof(cell);
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return value;
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}
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void push(cell tagged) {
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datastack += sizeof(cell);
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replace(tagged);
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}
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};
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VM_C_API context* new_context(factor_vm* parent);
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VM_C_API void delete_context(factor_vm* parent);
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VM_C_API void reset_context(factor_vm* parent);
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VM_C_API cell begin_callback(factor_vm* parent, cell quot);
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VM_C_API void end_callback(factor_vm* parent);
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}
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