mirror of
https://github.com/janet-lang/janet
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4a111b38b1
The break special form can break out of both loops and functions with an early (nil) return. Mainly useful for generated code in macros, and should probably be discouraged in user written code.
244 lines
7.1 KiB
C
244 lines
7.1 KiB
C
/*
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* Copyright (c) 2019 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 JANET_COMPILE_H
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#define JANET_COMPILE_H
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#ifndef JANET_AMALG
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#include <janet.h>
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#include "regalloc.h"
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#endif
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/* Tags for some functions for the prepared inliner */
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#define JANET_FUN_DEBUG 1
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#define JANET_FUN_ERROR 2
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#define JANET_FUN_APPLY 3
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#define JANET_FUN_YIELD 4
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#define JANET_FUN_RESUME 5
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#define JANET_FUN_GET 6
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#define JANET_FUN_PUT 7
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#define JANET_FUN_LENGTH 8
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#define JANET_FUN_ADD 9
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#define JANET_FUN_SUBTRACT 10
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#define JANET_FUN_MULTIPLY 11
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#define JANET_FUN_DIVIDE 12
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#define JANET_FUN_BAND 13
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#define JANET_FUN_BOR 14
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#define JANET_FUN_BXOR 15
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#define JANET_FUN_LSHIFT 16
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#define JANET_FUN_RSHIFT 17
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#define JANET_FUN_RSHIFTU 18
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#define JANET_FUN_BNOT 19
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#define JANET_FUN_ORDER_GT 20
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#define JANET_FUN_ORDER_LT 21
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#define JANET_FUN_ORDER_GTE 22
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#define JANET_FUN_ORDER_LTE 23
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#define JANET_FUN_ORDER_EQ 24
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#define JANET_FUN_ORDER_NEQ 25
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#define JANET_FUN_GT 26
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#define JANET_FUN_LT 27
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#define JANET_FUN_GTE 28
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#define JANET_FUN_LTE 29
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#define JANET_FUN_EQ 30
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#define JANET_FUN_NEQ 31
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/* Compiler typedefs */
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typedef struct JanetCompiler JanetCompiler;
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typedef struct FormOptions FormOptions;
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typedef struct SlotTracker SlotTracker;
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typedef struct JanetScope JanetScope;
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typedef struct JanetSlot JanetSlot;
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typedef struct JanetFopts JanetFopts;
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typedef struct JanetFunOptimizer JanetFunOptimizer;
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typedef struct JanetSpecial JanetSpecial;
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#define JANET_SLOT_CONSTANT 0x10000
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#define JANET_SLOT_NAMED 0x20000
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#define JANET_SLOT_MUTABLE 0x40000
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#define JANET_SLOT_REF 0x80000
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#define JANET_SLOT_RETURNED 0x100000
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/* Needed for handling single element arrays as global vars. */
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/* Used for unquote-splicing */
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#define JANET_SLOT_SPLICED 0x200000
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#define JANET_SLOTTYPE_ANY 0xFFFF
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/* A stack slot */
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struct JanetSlot {
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Janet constant; /* If the slot has a constant value */
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int32_t index;
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int32_t envindex; /* 0 is local, positive number is an upvalue */
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uint32_t flags;
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};
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#define JANET_SCOPE_FUNCTION 1
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#define JANET_SCOPE_ENV 2
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#define JANET_SCOPE_TOP 4
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#define JANET_SCOPE_UNUSED 8
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#define JANET_SCOPE_CLOSURE 16
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#define JANET_SCOPE_WHILE 32
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/* A symbol and slot pair */
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typedef struct SymPair {
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JanetSlot slot;
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const uint8_t *sym;
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int keep;
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} SymPair;
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/* A lexical scope during compilation */
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struct JanetScope {
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/* For debugging */
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const char *name;
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/* Scopes are doubly linked list */
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JanetScope *parent;
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JanetScope *child;
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/* Constants for this funcdef */
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Janet *consts;
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/* Map of symbols to slots. Use a simple linear scan for symbols. */
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SymPair *syms;
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/* FuncDefs */
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JanetFuncDef **defs;
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/* Regsiter allocator */
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JanetcRegisterAllocator ra;
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/* Referenced closure environents. The values at each index correspond
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* to which index to get the environment from in the parent. The environment
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* that corresponds to the direct parent's stack will always have value 0. */
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int32_t *envs;
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int32_t bytecode_start;
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int flags;
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};
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/* Compilation state */
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struct JanetCompiler {
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/* Pointer to current scope */
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JanetScope *scope;
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uint32_t *buffer;
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JanetSourceMapping *mapbuffer;
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/* Hold the environment */
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JanetTable *env;
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/* Name of source to attach to generated functions */
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const uint8_t *source;
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/* The result of compilation */
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JanetCompileResult result;
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/* Keep track of where we are in the source */
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JanetSourceMapping current_mapping;
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/* Prevent unbounded recursion */
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int recursion_guard;
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};
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#define JANET_FOPTS_TAIL 0x10000
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#define JANET_FOPTS_HINT 0x20000
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#define JANET_FOPTS_DROP 0x40000
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/* Options for compiling a single form */
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struct JanetFopts {
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JanetCompiler *compiler;
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JanetSlot hint;
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uint32_t flags; /* bit set of accepted primitive types */
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};
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/* Get the default form options */
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JanetFopts janetc_fopts_default(JanetCompiler *c);
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/* For optimizing builtin normal functions. */
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struct JanetFunOptimizer {
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int (*can_optimize)(JanetFopts opts, JanetSlot *args);
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JanetSlot(*optimize)(JanetFopts opts, JanetSlot *args);
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};
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/* A grouping of a named special and the corresponding compiler fragment */
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struct JanetSpecial {
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const char *name;
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JanetSlot(*compile)(JanetFopts opts, int32_t argn, const Janet *argv);
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};
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/****************************************************/
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/* Get an optimizer if it exists, otherwise NULL */
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const JanetFunOptimizer *janetc_funopt(uint32_t flags);
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/* Get a special. Return NULL if none exists */
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const JanetSpecial *janetc_special(const uint8_t *name);
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void janetc_freeslot(JanetCompiler *c, JanetSlot s);
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void janetc_nameslot(JanetCompiler *c, const uint8_t *sym, JanetSlot s);
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JanetSlot janetc_farslot(JanetCompiler *c);
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/* Throw away some code after checking that it is well formed. */
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void janetc_throwaway(JanetFopts opts, Janet x);
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/* Get a target slot for emitting an instruction. Will always return
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* a local slot. */
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JanetSlot janetc_gettarget(JanetFopts opts);
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/* Get a bunch of slots for function arguments */
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JanetSlot *janetc_toslots(JanetCompiler *c, const Janet *vals, int32_t len);
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/* Get a bunch of slots for function arguments */
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JanetSlot *janetc_toslotskv(JanetCompiler *c, Janet ds);
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/* Push slots load via janetc_toslots. */
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void janetc_pushslots(JanetCompiler *c, JanetSlot *slots);
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/* Free slots loaded via janetc_toslots */
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void janetc_freeslots(JanetCompiler *c, JanetSlot *slots);
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/* Generate the return instruction for a slot. */
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JanetSlot janetc_return(JanetCompiler *c, JanetSlot s);
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/* Store an error */
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void janetc_error(JanetCompiler *c, const uint8_t *m);
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void janetc_cerror(JanetCompiler *c, const char *m);
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/* Dispatch to correct form compiler */
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JanetSlot janetc_value(JanetFopts opts, Janet x);
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/* Push and pop from the scope stack */
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void janetc_scope(JanetScope *s, JanetCompiler *c, int flags, const char *name);
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void janetc_popscope(JanetCompiler *c);
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void janetc_popscope_keepslot(JanetCompiler *c, JanetSlot retslot);
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JanetFuncDef *janetc_pop_funcdef(JanetCompiler *c);
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/* Create a destory slots */
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JanetSlot janetc_cslot(Janet x);
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/* Search for a symbol */
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JanetSlot janetc_resolve(JanetCompiler *c, const uint8_t *sym);
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#endif
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