mirror of
https://github.com/janet-lang/janet
synced 2024-06-24 06:03:17 +00:00
406 lines
12 KiB
C
406 lines
12 KiB
C
/*
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* Copyright (c) 2017 Calvin Rose
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to
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* deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#ifndef DST_INTERNAL_H_defined
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#define DST_INTERNAL_H_defined
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#include <dst/dst.h>
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#include <string.h>
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#include <stdlib.h>
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/* String utils */
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#define dst_string_raw(s) ((uint32_t *)(s) - 2)
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#define dst_string_length(s) (dst_string_raw(s)[0])
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#define dst_string_hash(s) (dst_string_raw(s)[1])
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/* Tuple utils */
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#define dst_tuple_raw(t) ((uint32_t *)(t) - 2)
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#define dst_tuple_length(t) (dst_tuple_raw(t)[0])
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#define dst_tuple_hash(t) (dst_tuple_raw(t)[1])
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/* Struct utils */
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#define dst_struct_raw(t) ((uint32_t *)(t) - 2)
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#define dst_struct_length(t) (dst_struct_raw(t)[0])
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#define dst_struct_capacity(t) (dst_struct_length(t) * 4)
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#define dst_struct_hash(t) (dst_struct_raw(t)[1])
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/* Userdata utils */
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#define dst_udata_header(u) ((DstUserdataHeader *)(u) - 1)
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#define dst_udata_type(u) (dst_udata_header(u)->type)
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#define dst_udata_size(u) (dst_udata_header(u)->size)
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/* Stack frame manipulation */
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/* Size of stack frame in number of values */
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#define DST_FRAME_SIZE 5
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/* Prevent some recursive functions from recursing too deeply
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* ands crashing. */
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#define DST_RECURSION_GUARD 1000
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/* Macros for referencing a stack frame given a stack */
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#define dst_frame_callee(s) (*(s - 1))
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#define dst_frame_size(s) ((s - 2)->data.dwords[0])
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#define dst_frame_prevsize(s) ((s - 2)->data.dwords[1])
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#define dst_frame_args(s) ((s - 3)->data.dwords[0])
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#define dst_frame_ret(s) ((s - 3)->data.dwords[1])
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#define dst_frame_pc(s) ((s - 4)->data.u16p)
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#define dst_frame_env(s) ((s - 5)->data.env)
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/* C function helpers */
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/* Return in a c function */
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#define dst_c_return(vm, x) do { (vm)->ret = (x); return DST_RETURN_OK; } while (0)
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/* Throw error from a c function */
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#define dst_c_throw(vm, e) do { (vm)->ret = (e); return DST_RETURN_ERROR; } while (0)
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/* Throw c string error from a c function */
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#define dst_c_throwc(vm, e) dst_c_throw((vm), dst_string_cv((vm), (e)))
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/* Assert from a c function */
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#define dst_c_assert(vm, cond, e) do { if (cond) dst_c_throw((vm), (e)); } while (0)
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/* What to do when out of memory */
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#ifndef DST_OUT_OF_MEMORY
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#include <stdio.h>
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#define DST_OUT_OF_MEMORY do { printf("out of memory\n"); exit(1); } while (0)
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#endif
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/* A general dst value type */
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typedef struct DstValue DstValue;
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/* All of the dst types */
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typedef int DstBoolean;
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typedef struct DstFunction DstFunction;
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typedef struct DstArray DstArray;
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typedef struct DstBuffer DstBuffer;
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typedef struct DstTable DstTable;
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typedef struct DstThread DstThread;
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/* Other structs */
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typedef struct DstUserdataHeader DstUserdataHeader;
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typedef struct DstFuncDef DstFuncDef;
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typedef struct DstFuncEnv DstFuncEnv;
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typedef union DstValueUnion DstValueUnion;
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typedef struct DstUserType DstUserType;
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typedef struct DstParser DstParser;
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typedef struct DstParseState DstParseState;
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/* Union datatype */
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union DstValueUnion {
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DstBoolean boolean;
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double real;
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int64_t integer;
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DstArray *array;
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DstBuffer *buffer;
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DstTable *table;
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DstThread *thread;
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const DstValue *tuple;
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DstCFunction cfunction;
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DstFunction *function;
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const DstValue *st;
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const uint8_t *string;
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/* Indirectly used union members */
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uint16_t *u16p;
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uint32_t dwords[2];
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uint16_t words[4];
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uint8_t bytes[8];
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void *pointer;
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const char *cstring;
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};
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/* The general dst value type. Contains a large union and
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* the type information of the value */
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struct DstValue {
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DstType type;
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DstValueUnion as;
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};
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/* A lightweight green thread in dst. Does not correspond to
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* operating system threads. */
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struct DstThread {
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uint32_t count;
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uint32_t capacity;
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DstValue *data;
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DstThread *parent;
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enum {
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DST_THREAD_PENDING = 0,
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DST_THREAD_ALIVE,
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DST_THREAD_DEAD,
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DST_THREAD_ERROR
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} status;
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};
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/* A dynamic array type. */
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struct DstArray {
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uint32_t count;
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uint32_t capacity;
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DstValue *data;
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};
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/* A bytebuffer type. Used as a mutable string or string builder. */
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struct DstBuffer {
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uint32_t count;
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uint32_t capacity;
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uint8_t *data;
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};
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/* A mutable associative data type. Backed by a hashtable. */
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struct DstTable {
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uint32_t count;
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uint32_t capacity;
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uint32_t deleted;
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DstValue *data;
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};
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/* Some function defintion flags */
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#define DST_FUNCDEF_FLAG_VARARG 1
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#define DST_FUNCDEF_FLAG_NEEDSENV 4
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/* A function definition. Contains information needed to instantiate closures. */
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struct DstFuncDef {
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uint32_t flags;
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uint32_t locals; /* The amount of stack space required for the function */
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uint32_t arity; /* Not including varargs */
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uint32_t literalsLen; /* Number of literals */
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uint32_t byteCodeLen; /* Length of bytcode */
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uint32_t envLen; /* Number of environments */
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uint32_t *envSizes; /* Minimum sizes of environments (for static analysis) */
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uint32_t *envCaptures; /* Which environments to capture from parent. Is a bitset with the parent's envLen bits. */
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DstValue *literals; /* Contains strings, FuncDefs, etc. */
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uint32_t *byteCode;
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};
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/* A fuction environment */
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struct DstFuncEnv {
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DstThread *thread; /* When nil, index the local values */
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uint32_t stackOffset; /* Used as environment size when off stack */
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DstValue *values;
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};
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/* A function */
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struct DstFunction {
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DstFuncDef *def;
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DstFuncEnv *envs;
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};
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/* Defines a type for userdata */
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struct DstUserType {
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const char *name;
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int (*serialize)(Dst *vm, void *data, uint32_t len);
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int (*deserialize)(Dst *vm);
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void (*finalize)(Dst *vm, void *data, uint32_t len);
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};
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/* Contains information about userdata */
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struct DstUserdataHeader {
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uint32_t size;
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const DstUserType *type;
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};
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/* The VM state */
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struct Dst {
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/* Garbage collection */
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void *blocks;
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uint32_t memoryInterval;
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uint32_t nextCollection;
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uint32_t black : 1;
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/* Immutable value cache */
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DstValue *cache;
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uint32_t cache_capacity;
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uint32_t cache_count;
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uint32_t cache_deleted;
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/* GC roots */
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DstThread *thread;
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DstTable *modules;
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DstTable *registry;
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DstTable *env;
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/* Return state */
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DstValue ret;
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uint32_t flags;
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};
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/* Bytecode */
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enum DstOpCode {
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DST_OP_FLS, /* Load false */
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DST_OP_TRU, /* Load true */
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DST_OP_NIL, /* Load nil */
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DST_OP_UPV, /* Load upvalue */
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DST_OP_JIF, /* Jump if */
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DST_OP_JMP, /* Jump */
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DST_OP_SUV, /* Set upvalue */
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DST_OP_CST, /* Load constant */
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DST_OP_I16, /* Load 16 bit signed integer */
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DST_OP_I32, /* Load 32 bit signed integer */
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DST_OP_I64, /* Load 64 bit signed integer */
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DST_OP_F64, /* Load 64 bit IEEE double */
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DST_OP_MOV, /* Move value */
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DST_OP_CLN, /* Create a closure */
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DST_OP_ARR, /* Create array */
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DST_OP_DIC, /* Create object */
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DST_OP_TUP, /* Create tuple */
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DST_OP_RET, /* Return from function */
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DST_OP_RTN, /* Return nil */
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DST_OP_PSK, /* Push stack */
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DST_OP_PAR, /* Push array or tuple */
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DST_OP_CAL, /* Call function */
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DST_OP_TCL, /* Tail call */
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DST_OP_TRN /* Transfer to new thread */
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};
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/****/
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/* Value Stack Manipulation */
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/****/
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void dst_switchv(Dst *vm, DstValue x);
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DstValue dst_popv(Dst *vm);
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DstValue dst_peekv(Dst *vm);
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void dst_pushv(Dst *vm, DstValue x);
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DstValue dst_getv(Dst *vm, int64_t index);
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void dst_setv(Dst *vm, int64_t index, DstValue x);
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/****/
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/* Buffer functions */
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/****/
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void dst_buffer_ensure_(Dst *vm, DstBuffer *buffer, uint32_t capacity);
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void dst_buffer_push_u8_(Dst *vm, DstBuffer *buffer, uint8_t x);
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void dst_buffer_push_u16_(Dst *vm, DstBuffer *buffer, uint16_t x);
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void dst_buffer_push_u32_(Dst *vm, DstBuffer *buffer, uint32_t x);
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void dst_buffer_push_u64_(Dst *vm, DstBuffer *buffer, uint64_t x);
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void dst_buffer_push_bytes_(Dst *vm, DstBuffer *buffer, const uint8_t *bytes, uint32_t len);
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void dst_buffer_push_cstring_(Dst *vm, DstBuffer *buffer, const char *string);
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/****/
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/* Array functions */
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/****/
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DstArray *dst_make_array(Dst *vm, uint32_t capacity);
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void dst_array_ensure_(Dst *vm, DstArray *array, uint32_t capacity);
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/****/
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/* Tuple functions */
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/****/
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DstValue *dst_tuple_begin(Dst *vm, uint32_t length);
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const DstValue *dst_tuple_end(Dst *vm, DstValue *tuple);
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/****/
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/* String/Symbol functions */
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/****/
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const uint8_t *dst_string_b(Dst *vm, const uint8_t *buf, uint32_t len);
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const uint8_t *dst_string_c(Dst *vm, const char *cstring);
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DstValue dst_string_cv(Dst *vm, const char *string);
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DstValue dst_string_cvs(Dst *vm, const char *string);
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int dst_string_compare(const uint8_t *lhs, const uint8_t *rhs);
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const uint8_t *dst_string_bu(Dst *vm, const uint8_t *buf, uint32_t len);
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const uint8_t *dst_string_cu(Dst *vm, const char *s);
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/****/
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/* Struct functions */
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/****/
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DstValue *dst_struct_begin(Dst *vm, uint32_t count);
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void dst_struct_put(DstValue *st, DstValue key, DstValue value);
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const DstValue *dst_struct_end(Dst *vm, DstValue *st);
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DstValue dst_struct_get(const DstValue *st, DstValue key);
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DstValue dst_struct_next(const DstValue *st, DstValue key);
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/****/
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/* Table functions */
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/****/
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DstTable *dst_make_table(Dst *vm, uint32_t capacity);
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DstValue dst_table_get(DstTable *t, DstValue key);
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DstValue dst_table_remove(DstTable *t, DstValue key);
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void dst_table_put(Dst *vm, DstTable *t, DstValue key, DstValue value);
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DstValue dst_table_next(DstTable *o, DstValue key);
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/****/
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/* Threads */
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/****/
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#define dst_thread_stack(t) ((t)->data + (t)->count)
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DstThread *dst_thread(Dst *vm, DstValue callee, uint32_t capacity);
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DstThread *dst_thread_reset(Dst *vm, DstThread *thread, DstValue callee);
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void dst_thread_ensure_extra(Dst *vm, DstThread *thread, uint32_t extra);
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void dst_thread_push(Dst *vm, DstThread *thread, DstValue x);
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void dst_thread_pushnil(Dst *vm, DstThread *thread, uint32_t n);
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void dst_thread_tuplepack(Dst *vm, DstThread *thread, uint32_t n);
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DstValue *dst_thread_beginframe(Dst *vm, DstThread *thread, DstValue callee, uint32_t arity);
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void dst_thread_endframe(Dst *vm, DstThread *thread);
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DstValue *dst_thread_popframe(Dst *vm, DstThread *thread);
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uint32_t dst_thread_countframes(DstThread *thread);
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/****/
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/* Serialization */
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/****/
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const char *dst_deserialize_internal(
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Dst *vm,
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const uint8_t *data,
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uint32_t len,
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DstValue *out,
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const uint8_t **nextData);
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const char *dst_serialize_internal(Dst *vm, DstBuffer *buffer, DstValue x);
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/* Treat similar types through uniform interfaces for iteration */
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int dst_seq_view(DstValue seq, const DstValue **data, uint32_t *len);
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int dst_chararray_view(DstValue str, const uint8_t **data, uint32_t *len);
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int dst_hashtable_view(DstValue tab, const DstValue **data, uint32_t *cap);
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/****/
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/* Parse functions */
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/****/
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#define PARSE_OK 0
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#define PARSE_ERROR 1
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#define PARSE_UNEXPECTED_EOS 2
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int dst_parseb(Dst *vm, const uint8_t *src, const uint8_t **newsrc, uint32_t len);
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/* Parse a c string */
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int dst_parsec(Dst *vm, const char *src, const char **newsrc);
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/* Parse a DST char seq (Buffer, String, Symbol) */
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int dst_parse(Dst *vm);
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/****/
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/* Value functions */
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/****/
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int dst_truthy(DstValue v);
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int dst_equals(DstValue x, DstValue y);
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uint32_t dst_hash(DstValue x);
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int dst_compare(DstValue x, DstValue y);
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uint32_t dst_calchash_array(const DstValue *array, uint32_t len);
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/****/
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/* Helper functions */
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/****/
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uint32_t dst_startrange(int64_t index, uint32_t modulo);
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uint32_t dst_endrange(int64_t index, uint32_t modulo);
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int64_t dst_normalize_index(Dst *vm, int64_t index);
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#endif /* DST_INTERNAL_H_defined */
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