399 lines
7.9 KiB
C++
399 lines
7.9 KiB
C++
namespace factor
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{
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typedef unsigned char u8;
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typedef unsigned short u16;
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typedef unsigned int u32;
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typedef unsigned long long u64;
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typedef signed char s8;
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typedef signed short s16;
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typedef signed int s32;
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typedef signed long long s64;
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#ifdef _WIN64
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typedef long long fixnum;
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typedef unsigned long long cell;
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#else
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typedef long fixnum;
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typedef unsigned long cell;
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#endif
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inline static cell align(cell a, cell b)
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{
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return (a + (b-1)) & ~(b-1);
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}
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static const cell data_alignment = 16;
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#define WORD_SIZE (signed)(sizeof(cell)*8)
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#define TAG_MASK 7
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#define TAG_BITS 3
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#define TAG(x) ((cell)(x) & TAG_MASK)
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#define UNTAG(x) ((cell)(x) & ~TAG_MASK)
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#define RETAG(x,tag) (UNTAG(x) | (tag))
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/*** Tags ***/
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#define FIXNUM_TYPE 0
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#define BIGNUM_TYPE 1
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#define ARRAY_TYPE 2
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#define FLOAT_TYPE 3
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#define QUOTATION_TYPE 4
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#define F_TYPE 5
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#define OBJECT_TYPE 6
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#define TUPLE_TYPE 7
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#define HEADER_TYPE 8 /* anything less than this is a tag */
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#define GC_COLLECTED 5 /* can be anything other than FIXNUM_TYPE */
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/*** Header types ***/
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#define WRAPPER_TYPE 8
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#define BYTE_ARRAY_TYPE 9
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#define CALLSTACK_TYPE 10
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#define STRING_TYPE 11
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#define WORD_TYPE 12
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#define DLL_TYPE 13
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#define ALIEN_TYPE 14
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#define TYPE_COUNT 15
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enum code_block_type
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{
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code_block_unoptimized,
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code_block_optimized,
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code_block_profiling,
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code_block_pic
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};
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/* Constants used when floating-point trap exceptions are thrown */
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enum
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{
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FP_TRAP_INVALID_OPERATION = 1 << 0,
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FP_TRAP_OVERFLOW = 1 << 1,
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FP_TRAP_UNDERFLOW = 1 << 2,
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FP_TRAP_ZERO_DIVIDE = 1 << 3,
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FP_TRAP_INEXACT = 1 << 4,
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};
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/* What Factor calls 'f' */
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static const cell false_object = F_TYPE;
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inline static bool immediate_p(cell obj)
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{
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return (obj == false_object || TAG(obj) == FIXNUM_TYPE);
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}
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inline static fixnum untag_fixnum(cell tagged)
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{
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#ifdef FACTOR_DEBUG
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assert(TAG(tagged) == FIXNUM_TYPE);
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#endif
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return ((fixnum)tagged) >> TAG_BITS;
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}
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inline static cell tag_fixnum(fixnum untagged)
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{
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return RETAG(untagged << TAG_BITS,FIXNUM_TYPE);
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}
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inline static cell tag_for(cell type)
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{
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return type < HEADER_TYPE ? type : OBJECT_TYPE;
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}
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struct object;
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struct header {
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cell value;
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/* Default ctor to make gcc 3.x happy */
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explicit header() { abort(); }
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explicit header(cell value_) : value(value_ << TAG_BITS) {}
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void check_header() const
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{
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#ifdef FACTOR_DEBUG
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assert(TAG(value) == FIXNUM_TYPE && untag_fixnum(value) < TYPE_COUNT);
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#endif
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}
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cell hi_tag() const
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{
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check_header();
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return value >> TAG_BITS;
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}
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bool forwarding_pointer_p() const
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{
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return TAG(value) == GC_COLLECTED;
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}
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object *forwarding_pointer() const
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{
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return (object *)UNTAG(value);
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}
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void forward_to(object *pointer)
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{
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value = RETAG(pointer,GC_COLLECTED);
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}
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};
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#define NO_TYPE_CHECK static const cell type_number = TYPE_COUNT
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struct object {
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NO_TYPE_CHECK;
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header h;
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cell size() const;
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cell *slots() const { return (cell *)this; }
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/* Only valid for objects in tenured space; must fast to free_heap_block
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to do anything with it if its free */
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bool free_p() const
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{
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return h.value & 1 == 1;
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}
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};
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/* Assembly code makes assumptions about the layout of this struct */
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struct array : public object {
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static const cell type_number = ARRAY_TYPE;
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static const cell element_size = sizeof(cell);
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/* tagged */
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cell capacity;
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cell *data() const { return (cell *)(this + 1); }
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};
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/* These are really just arrays, but certain elements have special
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significance */
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struct tuple_layout : public array {
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NO_TYPE_CHECK;
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/* tagged */
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cell klass;
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/* tagged fixnum */
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cell size;
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/* tagged fixnum */
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cell echelon;
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};
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struct bignum : public object {
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static const cell type_number = BIGNUM_TYPE;
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static const cell element_size = sizeof(cell);
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/* tagged */
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cell capacity;
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cell *data() const { return (cell *)(this + 1); }
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};
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struct byte_array : public object {
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static const cell type_number = BYTE_ARRAY_TYPE;
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static const cell element_size = 1;
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/* tagged */
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cell capacity;
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#ifndef FACTOR_64
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cell padding0;
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cell padding1;
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#endif
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template<typename Scalar> Scalar *data() const { return (Scalar *)(this + 1); }
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};
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/* Assembly code makes assumptions about the layout of this struct */
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struct string : public object {
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static const cell type_number = STRING_TYPE;
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/* tagged num of chars */
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cell length;
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/* tagged */
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cell aux;
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/* tagged */
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cell hashcode;
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u8 *data() const { return (u8 *)(this + 1); }
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cell nth(cell i) const;
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};
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/* The compiled code heap is structured into blocks. */
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struct heap_block
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{
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cell header;
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bool free_p() const
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{
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return header & 1 == 1;
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}
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cell size() const
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{
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cell bytes = header >> 3;
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#ifdef FACTOR_DEBUG
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assert(bytes > 0);
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#endif
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return bytes;
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}
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void set_size(cell size)
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{
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header = ((header & 0x7) | (size << 3));
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}
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};
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struct free_heap_block : public heap_block
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{
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free_heap_block *next_free;
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void make_free(cell size)
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{
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header = (size << 3) | 1;
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}
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};
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struct code_block : public heap_block
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{
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cell owner; /* tagged pointer to word, quotation or f */
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cell literals; /* tagged pointer to array or f */
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cell relocation; /* tagged pointer to byte-array or f */
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void *xt() const
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{
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return (void *)(this + 1);
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}
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code_block_type type() const
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{
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return (code_block_type)((header >> 1) & 0x3);
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}
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void set_type(code_block_type type)
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{
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header = ((header & ~0x7) | (type << 1));
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}
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bool pic_p() const
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{
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return type() == code_block_pic;
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}
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bool optimized_p() const
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{
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return type() == code_block_optimized;
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}
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};
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/* Assembly code makes assumptions about the layout of this struct */
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struct word : public object {
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static const cell type_number = WORD_TYPE;
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/* TAGGED hashcode */
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cell hashcode;
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/* TAGGED word name */
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cell name;
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/* TAGGED word vocabulary */
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cell vocabulary;
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/* TAGGED definition */
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cell def;
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/* TAGGED property assoc for library code */
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cell props;
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/* TAGGED alternative entry point for direct non-tail calls. Used for inline caching */
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cell pic_def;
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/* TAGGED alternative entry point for direct tail calls. Used for inline caching */
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cell pic_tail_def;
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/* TAGGED call count for profiling */
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cell counter;
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/* TAGGED machine code for sub-primitive */
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cell subprimitive;
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/* UNTAGGED execution token: jump here to execute word */
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void *xt;
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/* UNTAGGED compiled code block */
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code_block *code;
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/* UNTAGGED profiler stub */
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code_block *profiling;
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};
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/* Assembly code makes assumptions about the layout of this struct */
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struct wrapper : public object {
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static const cell type_number = WRAPPER_TYPE;
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cell object;
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};
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/* Assembly code makes assumptions about the layout of this struct */
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struct boxed_float : object {
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static const cell type_number = FLOAT_TYPE;
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#ifndef FACTOR_64
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cell padding;
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#endif
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double n;
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};
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/* Assembly code makes assumptions about the layout of this struct */
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struct quotation : public object {
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static const cell type_number = QUOTATION_TYPE;
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/* tagged */
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cell array;
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/* tagged */
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cell cached_effect;
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/* tagged */
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cell cache_counter;
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/* UNTAGGED */
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void *xt;
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/* UNTAGGED compiled code block */
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code_block *code;
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};
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/* Assembly code makes assumptions about the layout of this struct */
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struct alien : public object {
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static const cell type_number = ALIEN_TYPE;
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/* tagged */
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cell base;
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/* tagged */
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cell expired;
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/* untagged */
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cell displacement;
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};
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struct dll : public object {
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static const cell type_number = DLL_TYPE;
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/* tagged byte array holding a C string */
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cell path;
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/* OS-specific handle */
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void *dll;
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};
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struct stack_frame
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{
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void *xt;
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/* Frame size in bytes */
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cell size;
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};
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struct callstack : public object {
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static const cell type_number = CALLSTACK_TYPE;
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/* tagged */
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cell length;
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stack_frame *frame_at(cell offset) const
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{
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return (stack_frame *)((char *)(this + 1) + offset);
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}
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stack_frame *top() const { return (stack_frame *)(this + 1); }
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stack_frame *bottom() const { return (stack_frame *)((cell)(this + 1) + untag_fixnum(length)); }
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};
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struct tuple : public object {
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static const cell type_number = TUPLE_TYPE;
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/* tagged layout */
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cell layout;
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cell *data() const { return (cell *)(this + 1); }
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};
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}
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