factor/vm/code_blocks.hpp

88 lines
1.6 KiB
C++

namespace factor
{
/* The compiled code heap is structured into blocks. */
struct code_block
{
cell header;
cell owner; /* tagged pointer to word, quotation or f */
cell parameters; /* tagged pointer to array or f */
cell relocation; /* tagged pointer to byte-array or f */
bool free_p() const
{
return (header & 1) == 1;
}
code_block_type type() const
{
return (code_block_type)((header >> 1) & 0x3);
}
void set_type(code_block_type type)
{
header = ((header & ~0x7) | (type << 1));
}
bool pic_p() const
{
return type() == code_block_pic;
}
bool optimized_p() const
{
return type() == code_block_optimized;
}
cell size() const
{
cell size = header & ~7;
#ifdef FACTOR_DEBUG
assert(size > 0);
#endif
return size;
}
template<typename Fixup> cell size(Fixup fixup) const
{
return size();
}
void *entry_point() const
{
return (void *)(this + 1);
}
/* GC info is stored at the end of the block */
gc_info *block_gc_info() const
{
return (gc_info *)((u8 *)this + size() - sizeof(gc_info));
}
void flush_icache()
{
factor::flush_icache((cell)this,size());
}
template<typename Iterator> void each_instruction_operand(Iterator &iter)
{
if(to_boolean(relocation))
{
byte_array *rels = (byte_array *)UNTAG(relocation);
cell index = 0;
cell length = (rels->capacity >> TAG_BITS) / sizeof(relocation_entry);
for(cell i = 0; i < length; i++)
{
relocation_entry rel = rels->data<relocation_entry>()[i];
iter(instruction_operand(rel,this,index));
index += rel.number_of_parameters();
}
}
}
};
VM_C_API void undefined_symbol(void);
}