113 lines
2.6 KiB
C++
113 lines
2.6 KiB
C++
#include "master.hpp"
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namespace factor
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{
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/* Simple code generator used by:
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- profiler (profiler.cpp),
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- quotation compiler (quotations.cpp),
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- megamorphic caches (dispatch.cpp),
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- polymorphic inline caches (inline_cache.cpp) */
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/* Allocates memory */
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jit::jit(code_block_type type_, cell owner_, factor_vm *vm)
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: type(type_),
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owner(owner_,vm),
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code(vm),
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relocation(vm),
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literals(vm),
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computing_offset_p(false),
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position(0),
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offset(0),
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parent(vm)
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{}
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void jit::emit_relocation(cell code_template_)
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{
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data_root<array> code_template(code_template_,parent);
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cell capacity = array_capacity(code_template.untagged());
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for(cell i = 1; i < capacity; i += 3)
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{
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cell rel_class = array_nth(code_template.untagged(),i);
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cell rel_type = array_nth(code_template.untagged(),i + 1);
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cell offset = array_nth(code_template.untagged(),i + 2);
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relocation_entry new_entry
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= (untag_fixnum(rel_type) << 28)
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| (untag_fixnum(rel_class) << 24)
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| ((code.count + untag_fixnum(offset)));
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relocation.append_bytes(&new_entry,sizeof(relocation_entry));
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}
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}
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/* Allocates memory */
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void jit::emit(cell code_template_)
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{
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data_root<array> code_template(code_template_,parent);
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emit_relocation(code_template.value());
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data_root<byte_array> insns(array_nth(code_template.untagged(),0),parent);
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if(computing_offset_p)
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{
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cell size = array_capacity(insns.untagged());
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if(offset == 0)
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{
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position--;
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computing_offset_p = false;
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}
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else if(offset < size)
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{
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position++;
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computing_offset_p = false;
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}
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else
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offset -= size;
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}
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code.append_byte_array(insns.value());
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}
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void jit::emit_with(cell code_template_, cell argument_) {
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data_root<array> code_template(code_template_,parent);
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data_root<object> argument(argument_,parent);
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literal(argument.value());
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emit(code_template.value());
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}
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void jit::emit_class_lookup(fixnum index, cell type)
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{
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emit_with(parent->special_objects[PIC_LOAD],tag_fixnum(-index * sizeof(cell)));
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emit(parent->special_objects[type]);
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}
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/* Facility to convert compiled code offsets to quotation offsets.
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Call jit_compute_offset() with the compiled code offset, then emit
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code, and at the end jit->position is the quotation position. */
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void jit::compute_position(cell offset_)
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{
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computing_offset_p = true;
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position = 0;
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offset = offset_;
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}
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/* Allocates memory */
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code_block *jit::to_code_block()
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{
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code.trim();
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relocation.trim();
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literals.trim();
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return parent->add_code_block(
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type,
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code.elements.value(),
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false_object, /* no labels */
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owner.value(),
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relocation.elements.value(),
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literals.elements.value());
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}
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}
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