115 lines
3.2 KiB
C++
115 lines
3.2 KiB
C++
namespace factor {
|
|
|
|
// The compiled code heap is structured into blocks.
|
|
struct code_block {
|
|
// header format (bits indexed with least significant as zero):
|
|
// bit 0 : free?
|
|
// bits 1-2: type (as a code_block_type)
|
|
// if not free:
|
|
// bits 3-23: code size / 8
|
|
// bits 24-31: stack frame size / 16
|
|
// if free:
|
|
// bits 3-end: code size / 8
|
|
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; }
|
|
|
|
cell size() const {
|
|
cell size;
|
|
if (free_p())
|
|
size = header & ~7;
|
|
else
|
|
size = header & 0xFFFFF8;
|
|
FACTOR_ASSERT(size > 0);
|
|
return size;
|
|
}
|
|
|
|
cell stack_frame_size() const {
|
|
if (free_p())
|
|
return 0;
|
|
return (header >> 20) & 0xFF0;
|
|
}
|
|
|
|
cell stack_frame_size_for_address(cell addr) const {
|
|
cell natural_frame_size = stack_frame_size();
|
|
// The first instruction in a code block is the prolog safepoint,
|
|
// and a leaf procedure code block will record a frame size of zero.
|
|
// If we're seeing a stack frame in either of these cases, it's a
|
|
// fake "leaf frame" set up by the signal handler.
|
|
if (natural_frame_size == 0 || addr == entry_point())
|
|
return LEAF_FRAME_SIZE;
|
|
return natural_frame_size;
|
|
}
|
|
|
|
void set_stack_frame_size(cell frame_size) {
|
|
FACTOR_ASSERT(size() < 0xFFFFFF);
|
|
FACTOR_ASSERT(!free_p());
|
|
FACTOR_ASSERT(frame_size % 16 == 0);
|
|
FACTOR_ASSERT(frame_size <= 0xFF0);
|
|
header = (header & 0xFFFFFF) | (frame_size << 20);
|
|
}
|
|
|
|
template <typename Fixup> cell size(Fixup fixup) const { return size(); }
|
|
|
|
cell entry_point() const { return (cell)(this + 1); }
|
|
|
|
// GC info is stored at the end of the block
|
|
gc_info* block_gc_info() const {
|
|
return (gc_info*)((uint8_t*)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))
|
|
return;
|
|
|
|
byte_array* rels = untag<byte_array>(relocation);
|
|
|
|
cell index = 0;
|
|
cell length = untag_fixnum(rels->capacity) / 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();
|
|
}
|
|
}
|
|
|
|
cell offset(cell addr) const { return addr - entry_point(); }
|
|
|
|
cell address_for_offset(cell offset) const {
|
|
return entry_point() + offset;
|
|
}
|
|
|
|
cell scan(factor_vm* vm, cell addr) const;
|
|
cell owner_quot() const;
|
|
};
|
|
|
|
VM_C_API void undefined_symbol(void);
|
|
|
|
inline code_block* word::code() const {
|
|
FACTOR_ASSERT(entry_point != 0);
|
|
return (code_block*)entry_point - 1;
|
|
}
|
|
|
|
inline code_block* quotation::code() const {
|
|
FACTOR_ASSERT(entry_point != 0);
|
|
return (code_block*)entry_point - 1;
|
|
}
|
|
|
|
}
|