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little.h
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little.h
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#pragma once
#include <stdint.h>
typedef uint64_t lt_Value;
// IEEE 756 DOUBLE S[Exponent-][Mantissa------------------------------------------]
#define LT_SIGN_BIT (0b1000000000000000000000000000000000000000000000000000000000000000)
#define LT_EXPONENT (0b0111111111110000000000000000000000000000000000000000000000000000)
#define LT_QNAN_BIT (0b0000000000001000000000000000000000000000000000000000000000000000)
#define LT_TYPE_MASK (0b0000000000000111000000000000000000000000000000000000000000000000)
#define LT_VALUE_MASK (0b0000000000000000111111111111111111111111111111111111111111111111)
#define LT_NAN_MASK (LT_EXPONENT | LT_QNAN_BIT)
#define LT_TYPE_NULL (0b0000000000000011000000000000000000000000000000000000000000000000)
#define LT_TYPE_BOOL (0b0000000000000001000000000000000000000000000000000000000000000000)
#define LT_TYPE_STRING (0b0000000000000010000000000000000000000000000000000000000000000000)
#define LT_TYPE_OBJECT (0b0000000000000101000000000000000000000000000000000000000000000000)
#define LT_VALUE_NULL ((lt_Value)(LT_NAN_MASK | LT_TYPE_NULL))
#define LT_VALUE_FALSE ((lt_Value)(LT_NAN_MASK | LT_TYPE_BOOL))
#define LT_VALUE_TRUE ((lt_Value)(LT_NAN_MASK | (LT_TYPE_BOOL | 1)))
#define LT_VALUE_NUMBER(x) ((lt_Value)(lt_make_number((double)x)))
#define LT_VALUE_OBJECT(x) ((lt_Value)(LT_NAN_MASK | (LT_TYPE_OBJECT | (uint64_t)x)))
#define LT_IS_NUMBER(x) (((x) & LT_NAN_MASK) != LT_NAN_MASK)
#define LT_IS_NULL(x) ((x) == LT_VALUE_NULL)
#define LT_IS_BOOL(x) (x == LT_VALUE_TRUE || x == LT_VALUE_FALSE)
#define LT_IS_TRUE(x) (x == LT_VALUE_TRUE)
#define LT_IS_FALSE(x) (x == LT_VALUE_FALSE)
#define LT_IS_TRUTHY(x) (!(x == LT_VALUE_FALSE || x == LT_VALUE_NULL))
#define LT_IS_STRING(x) (!LT_IS_NUMBER(x) && (x & LT_TYPE_MASK) == LT_TYPE_STRING)
#define LT_IS_OBJECT(x) (!LT_IS_NUMBER(x) && (x & LT_TYPE_MASK) == LT_TYPE_OBJECT)
#define LT_IS_TABLE(x) (LT_IS_OBJECT(x) && LT_GET_OBJECT(x)->type == LT_OBJECT_TABLE)
#define LT_IS_ARRAY(x) (LT_IS_OBJECT(x) && LT_GET_OBJECT(x)->type == LT_OBJECT_ARRAY)
#define LT_IS_FUNCTION(x) (LT_IS_OBJECT(x) && LT_GET_OBJECT(x)->type == LT_OBJECT_FN)
#define LT_IS_CLOSURE(x) (LT_IS_OBJECT(x) && LT_GET_OBJECT(x)->type == LT_OBJECT_CLOSURE)
#define LT_IS_NATIVE(x) (LT_IS_OBJECT(x) && LT_GET_OBJECT(x)->type == LT_OBJECT_NATIVEFN)
#define LT_IS_PTR(x) (LT_IS_OBJECT(x) && LT_GET_OBJECT(x)->type == LT_OBJECT_PTR)
#define LT_GET_NUMBER(x) lt_get_number(x)
#define LT_GET_STRING(vm, x) lt_get_string(vm, x)
#define LT_GET_OBJECT(x) ((lt_Object*)(x & LT_VALUE_MASK))
typedef enum {
LT_TOKEN_TRUE_LITERAL,
LT_TOKEN_FALSE_LITERAL,
LT_TOKEN_STRING_LITERAL,
LT_TOKEN_NULL_LITERAL,
LT_TOKEN_NUMBER_LITERAL,
LT_TOKEN_IDENTIFIER,
LT_TOKEN_PERIOD,
LT_TOKEN_COMMA,
LT_TOKEN_COLON,
LT_TOKEN_OPENPAREN,
LT_TOKEN_CLOSEPAREN,
LT_TOKEN_OPENBRACKET,
LT_TOKEN_CLOSEBRACKET,
LT_TOKEN_OPENBRACE,
LT_TOKEN_CLOSEBRACE,
LT_TOKEN_FN,
LT_TOKEN_BREAK,
LT_TOKEN_VAR,
LT_TOKEN_IF,
LT_TOKEN_ELSE,
LT_TOKEN_ELSEIF,
LT_TOKEN_FOR,
LT_TOKEN_IN,
LT_TOKEN_WHILE,
LT_TOKEN_RETURN,
LT_TOKEN_PLUS,
LT_TOKEN_MINUS,
LT_TOKEN_NEGATE,
LT_TOKEN_MULTIPLY,
LT_TOKEN_DIVIDE,
LT_TOKEN_ASSIGN,
LT_TOKEN_EQUALS,
LT_TOKEN_NOTEQUALS,
LT_TOKEN_GT,
LT_TOKEN_GTE,
LT_TOKEN_LT,
LT_TOKEN_LTE,
LT_TOKEN_AND,
LT_TOKEN_OR,
LT_TOKEN_NOT,
LT_TOKEN_END,
} lt_TokenType;
typedef struct {
lt_TokenType type;
uint16_t line, col, idx;
} lt_Token;
typedef struct {
void* data;
uint32_t length, capacity, element_size;
} lt_Buffer;
typedef struct {
lt_TokenType type;
union {
char* string;
double number;
};
} lt_Literal;
typedef struct {
char* name;
uint32_t num_references;
} lt_Identifier;
typedef struct {
lt_Buffer token_buffer;
lt_Buffer literal_buffer;
lt_Buffer identifier_buffer;
const char* source;
const char* module;
uint8_t is_valid;
} lt_Tokenizer;
typedef enum {
LT_AST_NODE_ERROR,
LT_AST_NODE_EMPTY,
LT_AST_NODE_CHUNK,
LT_AST_NODE_LITERAL,
LT_AST_NODE_TABLE,
LT_AST_NODE_ARRAY,
LT_AST_NODE_IDENTIFIER,
LT_AST_NODE_INDEX,
LT_AST_NODE_BINARYOP,
LT_AST_NODE_UNARYOP,
LT_AST_NODE_DECLARE,
LT_AST_NODE_ASSIGN,
LT_AST_NODE_FN,
LT_AST_NODE_CALL,
LT_AST_NODE_RETURN,
LT_AST_NODE_IF,
LT_AST_NODE_ELSE,
LT_AST_NODE_ELSEIF,
LT_AST_NODE_FOR,
LT_AST_NODE_WHILE,
LT_AST_NODE_BREAK,
} lt_AstNodeType;
struct lt_AstNode;
struct lt_Scope;
typedef struct
{
uint16_t line, col;
} lt_DebugLoc;
typedef struct
{
const char* module_name;
lt_Buffer locations;
} lt_DebugInfo;
typedef struct lt_AstNode {
lt_AstNodeType type;
lt_DebugLoc loc;
union {
struct {
char* name;
lt_Buffer body;
struct lt_Scope* scope;
} chunk;
struct {
lt_Token* token;
} literal;
struct {
lt_Buffer keys;
lt_Buffer values;
} table;
struct {
lt_Buffer values;
} array;
struct {
lt_Token* token;
} identifier;
struct {
struct lt_AstNode* source;
struct lt_AstNode* idx;
} index;
struct {
lt_TokenType type;
struct lt_AstNode* left;
struct lt_AstNode* right;
} binary_op;
struct {
lt_TokenType type;
struct lt_AstNode* expr;
} unary_op;
struct {
lt_Token* identifier;
struct lt_AstNode* expr;
} declare;
struct {
struct lt_AstNode* left;
struct lt_AstNode* right;
} assign;
struct {
lt_Token* args[16];
struct lt_Scope* scope;
lt_Buffer body;
} fn;
struct {
struct lt_AstNode* callee;
struct lt_AstNode* args[16];
} call;
struct {
struct lt_AstNode* expr;
} ret;
struct {
struct lt_AstNode* expr;
lt_Buffer body;
struct lt_AstNode* next;
} branch;
struct {
uint16_t identifier, closureidx;
struct lt_AstNode* iterator;
lt_Buffer body;
} loop;
};
} lt_AstNode;
typedef struct lt_Scope {
struct lt_Scope* last;
lt_Token* start;
lt_Buffer locals;
lt_Buffer upvals;
lt_Token* end;
} lt_Scope;
typedef struct {
lt_Buffer ast_nodes;
lt_AstNode* root;
lt_Tokenizer* tkn;
lt_Scope* current;
uint8_t is_valid;
} lt_Parser;
typedef struct {
lt_Value key, value;
} lt_TablePair;
typedef struct {
lt_Buffer buckets[16];
} lt_Table;
typedef enum {
LT_OBJECT_CHUNK,
LT_OBJECT_FN,
LT_OBJECT_CLOSURE,
LT_OBJECT_TABLE,
LT_OBJECT_ARRAY,
LT_OBJECT_NATIVEFN,
LT_OBJECT_PTR,
} lt_ObjectType;
struct lt_VM;
typedef uint8_t(*lt_NativeFn)(struct lt_VM* vm, uint8_t argc);
typedef struct {
lt_ObjectType type;
union
{
struct
{
lt_Buffer code;
lt_Buffer constants;
char* name;
lt_DebugInfo* debug;
} chunk;
struct
{
uint8_t arity;
lt_Buffer code;
lt_Buffer constants;
lt_DebugInfo* debug;
} fn;
struct
{
char* string;
uint16_t len;
} string;
struct
{
lt_Value function;
lt_Buffer captures;
} closure;
lt_Table table;
lt_Buffer array;
lt_NativeFn native;
void* ptr;
};
uint8_t markbit : 1;
} lt_Object;
typedef struct {
uint8_t op;
int8_t arg;
} lt_Op;
typedef struct lt_Frame {
lt_Object* callee;
lt_Buffer* code;
lt_Buffer* constants;
lt_Buffer* upvals;
lt_Value* start;
lt_Op** ip;
} lt_Frame;
typedef void* (*lt_AllocFn)(size_t);
typedef void (*lt_FreeFn)(void*);
typedef void (*lt_ErrorFn)(struct lt_VM* vm, const char*);
#ifndef LT_STACK_SIZE
#define LT_STACK_SIZE 256
#endif
#ifndef LT_CALLSTACK_SIZE
#define LT_CALLSTACK_SIZE 32
#endif
#ifndef LT_DEDUP_TABLE_SIZE
#define LT_DEDUP_TABLE_SIZE 64
#endif
typedef struct {
lt_Buffer heap;
lt_Buffer keepalive;
lt_Value* top;
lt_Value stack[LT_STACK_SIZE];
uint16_t depth;
lt_Frame callstack[LT_CALLSTACK_SIZE];
lt_Frame* current;
lt_Buffer strings[LT_DEDUP_TABLE_SIZE];
lt_Value global;
lt_AllocFn alloc;
lt_FreeFn free;
lt_ErrorFn error;
void* error_buf;
uint8_t generate_debug;
} lt_VM;
lt_VM* lt_open(lt_AllocFn alloc, lt_FreeFn free, lt_ErrorFn error);
void lt_destroy(lt_VM* vm);
lt_Buffer lt_buffer_new(uint32_t element_size);
void lt_buffer_destroy(lt_VM* vm, lt_Buffer* buf);
lt_Object* lt_allocate(lt_VM* vm, lt_ObjectType type);
void lt_free(lt_VM* vm, uint32_t heapidx);
void lt_nocollect(lt_VM* vm, lt_Object* obj);
void lt_resumecollect(lt_VM* vm, lt_Object* obj);
uint32_t lt_collect(lt_VM* vm);
void lt_push(lt_VM* vm, lt_Value val);
lt_Value lt_pop(lt_VM* vm);
lt_Value lt_at(lt_VM* vm, uint32_t idx);
void lt_close(lt_VM* vm, uint8_t count);
lt_Value lt_getupval(lt_VM* vm, uint8_t idx);
void lt_setupval(lt_VM* vm, uint8_t idx, lt_Value val);
uint16_t lt_exec(lt_VM* vm, lt_Value callable, uint8_t argc);
void lt_error(lt_VM* vm, const char* msg);
void lt_runtime_error(lt_VM* vm, const char* message);
lt_Tokenizer lt_tokenize(lt_VM* vm, const char* source, const char* mod_name);
lt_Parser lt_parse(lt_VM* vm, lt_Tokenizer* tkn);
lt_Value lt_compile(lt_VM* vm, lt_Parser* p);
void lt_free_parser(lt_VM* vm, lt_Parser* p);
void lt_free_tokenizer(lt_VM* vm, lt_Tokenizer* tok);
lt_Value lt_loadstring(lt_VM* vm, const char* source, const char* mod_name);
uint32_t lt_dostring(lt_VM* vm, const char* source, const char* mod_name);
lt_Value lt_make_number(double n);
double lt_get_number(lt_Value v);
lt_Value lt_make_string(lt_VM* vm, const char* string);
const char* lt_get_string(lt_VM* vm, lt_Value value);
uint8_t lt_equals(lt_Value a, lt_Value b);
lt_Value lt_make_table(lt_VM* vm);
lt_Value lt_table_set(lt_VM* vm, lt_Value table, lt_Value key, lt_Value val);
lt_Value lt_table_get(lt_VM* vm, lt_Value table, lt_Value key);
uint8_t lt_table_pop(lt_VM* vm, lt_Value table, lt_Value key);
lt_Value lt_make_array(lt_VM* vm);
lt_Value lt_array_push(lt_VM* vm, lt_Value array, lt_Value val);
lt_Value* lt_array_at(lt_Value array, uint32_t idx);
lt_Value lt_array_remove(lt_VM* vm, lt_Value array, uint32_t idx);
uint32_t lt_array_length(lt_Value array);
lt_Value lt_make_native(lt_VM* vm, lt_NativeFn fn);
lt_Value lt_make_ptr(lt_VM* vm, void* ptr);
void* lt_get_ptr(lt_Value ptr);