factor/vm/layouts.hpp

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namespace factor
{
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typedef unsigned char u8;
typedef unsigned short u16;
typedef unsigned int u32;
typedef unsigned long long u64;
typedef signed char s8;
typedef signed short s16;
typedef signed int s32;
typedef signed long long s64;
#ifdef _WIN64
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typedef long long fixnum;
typedef unsigned long long cell;
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#else
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typedef long fixnum;
typedef unsigned long cell;
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#endif
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inline static cell align(cell a, cell b)
{
return (a + (b-1)) & ~(b-1);
}
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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 15
#define TAG_BITS 4
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#define TAG(x) ((cell)(x) & TAG_MASK)
#define UNTAG(x) ((cell)(x) & ~TAG_MASK)
#define RETAG(x,tag) (UNTAG(x) | (tag))
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/*** Tags ***/
#define FIXNUM_TYPE 0
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#define F_TYPE 1
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#define ARRAY_TYPE 2
#define FLOAT_TYPE 3
#define QUOTATION_TYPE 4
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#define BIGNUM_TYPE 5
#define ALIEN_TYPE 6
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#define TUPLE_TYPE 7
#define WRAPPER_TYPE 8
#define BYTE_ARRAY_TYPE 9
#define CALLSTACK_TYPE 10
#define STRING_TYPE 11
#define WORD_TYPE 12
#define DLL_TYPE 13
#define TYPE_COUNT 14
#define FORWARDING_POINTER 5 /* can be anything other than FIXNUM_TYPE */
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enum code_block_type
{
code_block_unoptimized,
code_block_optimized,
code_block_profiling,
code_block_pic
};
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/* Constants used when floating-point trap exceptions are thrown */
enum
{
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FP_TRAP_INVALID_OPERATION = 1 << 0,
FP_TRAP_OVERFLOW = 1 << 1,
FP_TRAP_UNDERFLOW = 1 << 2,
FP_TRAP_ZERO_DIVIDE = 1 << 3,
FP_TRAP_INEXACT = 1 << 4,
};
/* What Factor calls 'f' */
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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/* We assume that fixnums have tag 0 and false_object has tag 1 */
return TAG(obj) <= F_TYPE;
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}
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inline static fixnum untag_fixnum(cell tagged)
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{
#ifdef FACTOR_DEBUG
assert(TAG(tagged) == FIXNUM_TYPE);
#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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{
return RETAG(untagged << TAG_BITS,FIXNUM_TYPE);
}
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struct object;
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struct header {
cell value;
/* Default ctor to make gcc 3.x happy */
explicit header() { abort(); }
explicit header(cell value_) : value(value_ << TAG_BITS) {}
void check_header() const
{
#ifdef FACTOR_DEBUG
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assert(TAG(value) == FIXNUM_TYPE && untag_fixnum(value) < TYPE_COUNT);
#endif
}
cell hi_tag() const
{
check_header();
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return value >> TAG_BITS;
}
bool forwarding_pointer_p() const
{
return TAG(value) == FORWARDING_POINTER;
}
object *forwarding_pointer() const
{
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return (object *)UNTAG(value);
}
void forward_to(object *pointer)
{
value = RETAG(pointer,FORWARDING_POINTER);
}
};
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#define NO_TYPE_CHECK static const cell type_number = TYPE_COUNT
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struct object {
NO_TYPE_CHECK;
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header h;
cell size() const;
cell binary_payload_start() const;
cell *slots() const { return (cell *)this; }
/* Only valid for objects in tenured space; must fast to free_heap_block
to do anything with it if its free */
bool free_p() const
{
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return (h.value & 1) == 1;
}
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};
/* Assembly code makes assumptions about the layout of this struct */
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struct array : public object {
static const cell type_number = ARRAY_TYPE;
static const cell element_size = sizeof(cell);
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/* tagged */
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cell capacity;
cell *data() const { return (cell *)(this + 1); }
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};
/* These are really just arrays, but certain elements have special
significance */
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struct tuple_layout : public array {
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 {
static const cell type_number = BIGNUM_TYPE;
static const cell element_size = sizeof(cell);
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/* tagged */
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cell capacity;
cell *data() const { return (cell *)(this + 1); }
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};
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struct byte_array : public object {
static const cell type_number = BYTE_ARRAY_TYPE;
static const cell element_size = 1;
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/* tagged */
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cell capacity;
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#ifndef FACTOR_64
cell padding0;
cell padding1;
#endif
template<typename Scalar> Scalar *data() const { return (Scalar *)(this + 1); }
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};
/* Assembly code makes assumptions about the layout of this struct */
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struct string : public object {
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;
u8 *data() const { return (u8 *)(this + 1); }
cell nth(cell i) const;
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};
/* The compiled code heap is structured into blocks. */
struct code_block
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{
cell header;
cell owner; /* tagged pointer to word, quotation or f */
cell literals; /* tagged pointer to array or f */
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cell relocation; /* tagged pointer to byte-array or f */
bool free_p() const
{
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return (header & 1) == 1;
}
code_block_type type() const
{
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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
{
return header & ~7;
}
void *xt() const
{
return (void *)(this + 1);
}
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};
/* Assembly code makes assumptions about the layout of this struct */
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struct word : public object {
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 */
cell pic_def;
/* TAGGED alternative entry point for direct tail calls. Used for inline caching */
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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};
/* Assembly code makes assumptions about the layout of this struct */
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struct wrapper : public object {
static const cell type_number = WRAPPER_TYPE;
cell object;
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};
/* Assembly code makes assumptions about the layout of this struct */
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struct boxed_float : object {
static const cell type_number = FLOAT_TYPE;
#ifndef FACTOR_64
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cell padding;
#endif
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double n;
};
/* Assembly code makes assumptions about the layout of this struct */
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struct quotation : public object {
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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};
/* Assembly code makes assumptions about the layout of this struct */
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struct alien : public object {
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;
/* untagged */
cell address;
void update_address()
{
if(base == false_object)
address = displacement;
else
address = UNTAG(base) + sizeof(byte_array) + displacement;
}
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};
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struct dll : public object {
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 */
void *dll;
};
struct stack_frame {
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void *xt;
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/* Frame size in bytes */
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cell size;
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};
struct callstack : public object {
static const cell type_number = CALLSTACK_TYPE;
/* tagged */
cell length;
stack_frame *frame_at(cell offset) const
{
return (stack_frame *)((char *)(this + 1) + offset);
}
stack_frame *top() const { return (stack_frame *)(this + 1); }
stack_frame *bottom() const { return (stack_frame *)((cell)(this + 1) + untag_fixnum(length)); }
};
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struct tuple : public object {
static const cell type_number = TUPLE_TYPE;
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/* tagged layout */
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cell layout;
cell *data() const { return (cell *)(this + 1); }
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};
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struct data_root_range {
cell *start;
cell len;
explicit data_root_range(cell *start_, cell len_) :
start(start_), len(len_) {}
};
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}