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a65386e925
janet/src/core/asm.c
Calvin Rose 235605bfa4 1.9.0 Release. 
Fix up some documentation as well.
2020-05-10 16:45:33 -05:00

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/*
* Copyright (c) 2020 Calvin Rose
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#ifndef JANET_AMALG
#include "features.h"
#include <janet.h>
#include "util.h"
#endif
#include <setjmp.h>
/* Conditionally compile this file */
#ifdef JANET_ASSEMBLER
/* Definition for an instruction in the assembler */
typedef struct JanetInstructionDef JanetInstructionDef;
struct JanetInstructionDef {
const char *name;
enum JanetOpCode opcode;
};
/* Hold all state needed during assembly */
typedef struct JanetAssembler JanetAssembler;
struct JanetAssembler {
JanetAssembler *parent;
JanetFuncDef *def;
jmp_buf on_error;
const uint8_t *errmessage;
int32_t errindex;
int32_t environments_capacity;
int32_t defs_capacity;
int32_t bytecode_count; /* Used for calculating labels */
Janet name;
JanetTable labels; /* keyword -> bytecode index */
JanetTable constants; /* symbol -> constant index */
JanetTable slots; /* symbol -> slot index */
JanetTable envs; /* symbol -> environment index */
JanetTable defs; /* symbol -> funcdefs index */
};
/* Janet opcode descriptions in lexicographic order. This
* allows a binary search over the elements to find the
* correct opcode given a name. This works in reasonable
* time and is easier to setup statically than a hash table or
* prefix tree. */
static const JanetInstructionDef janet_ops[] = {
{"add", JOP_ADD},
{"addim", JOP_ADD_IMMEDIATE},
{"band", JOP_BAND},
{"bnot", JOP_BNOT},
{"bor", JOP_BOR},
{"bxor", JOP_BXOR},
{"call", JOP_CALL},
{"clo", JOP_CLOSURE},
{"cmp", JOP_COMPARE},
{"div", JOP_DIVIDE},
{"divim", JOP_DIVIDE_IMMEDIATE},
{"eq", JOP_EQUALS},
{"eqim", JOP_EQUALS_IMMEDIATE},
{"err", JOP_ERROR},
{"get", JOP_GET},
{"geti", JOP_GET_INDEX},
{"gt", JOP_GREATER_THAN},
{"gte", JOP_GREATER_THAN_EQUAL},
{"gtim", JOP_GREATER_THAN_IMMEDIATE},
{"in", JOP_IN},
{"jmp", JOP_JUMP},
{"jmpif", JOP_JUMP_IF},
{"jmpni", JOP_JUMP_IF_NIL},
{"jmpnn", JOP_JUMP_IF_NOT_NIL},
{"jmpno", JOP_JUMP_IF_NOT},
{"ldc", JOP_LOAD_CONSTANT},
{"ldf", JOP_LOAD_FALSE},
{"ldi", JOP_LOAD_INTEGER},
{"ldn", JOP_LOAD_NIL},
{"lds", JOP_LOAD_SELF},
{"ldt", JOP_LOAD_TRUE},
{"ldu", JOP_LOAD_UPVALUE},
{"len", JOP_LENGTH},
{"lt", JOP_LESS_THAN},
{"lte", JOP_LESS_THAN_EQUAL},
{"ltim", JOP_LESS_THAN_IMMEDIATE},
{"mkarr", JOP_MAKE_ARRAY},
{"mkbtp", JOP_MAKE_BRACKET_TUPLE},
{"mkbuf", JOP_MAKE_BUFFER},
{"mkstr", JOP_MAKE_STRING},
{"mkstu", JOP_MAKE_STRUCT},
{"mktab", JOP_MAKE_TABLE},
{"mktup", JOP_MAKE_TUPLE},
{"mod", JOP_MODULO},
{"movf", JOP_MOVE_FAR},
{"movn", JOP_MOVE_NEAR},
{"mul", JOP_MULTIPLY},
{"mulim", JOP_MULTIPLY_IMMEDIATE},
{"next", JOP_NEXT},
{"noop", JOP_NOOP},
{"prop", JOP_PROPAGATE},
{"push", JOP_PUSH},
{"push2", JOP_PUSH_2},
{"push3", JOP_PUSH_3},
{"pusha", JOP_PUSH_ARRAY},
{"put", JOP_PUT},
{"puti", JOP_PUT_INDEX},
{"rem", JOP_REMAINDER},
{"res", JOP_RESUME},
{"ret", JOP_RETURN},
{"retn", JOP_RETURN_NIL},
{"setu", JOP_SET_UPVALUE},
{"sig", JOP_SIGNAL},
{"sl", JOP_SHIFT_LEFT},
{"slim", JOP_SHIFT_LEFT_IMMEDIATE},
{"sr", JOP_SHIFT_RIGHT},
{"srim", JOP_SHIFT_RIGHT_IMMEDIATE},
{"sru", JOP_SHIFT_RIGHT_UNSIGNED},
{"sruim", JOP_SHIFT_RIGHT_UNSIGNED_IMMEDIATE},
{"sub", JOP_SUBTRACT},
{"tcall", JOP_TAILCALL},
{"tchck", JOP_TYPECHECK}
};
/* Typename aliases for tchck instruction */
typedef struct TypeAlias {
const char *name;
int32_t mask;
} TypeAlias;
static const TypeAlias type_aliases[] = {
{"abstract", JANET_TFLAG_ABSTRACT},
{"array", JANET_TFLAG_ARRAY},
{"boolean", JANET_TFLAG_BOOLEAN},
{"buffer", JANET_TFLAG_BUFFER},
{"callable", JANET_TFLAG_CALLABLE},
{"cfunction", JANET_TFLAG_CFUNCTION},
{"dictionary", JANET_TFLAG_DICTIONARY},
{"fiber", JANET_TFLAG_FIBER},
{"function", JANET_TFLAG_FUNCTION},
{"indexed", JANET_TFLAG_INDEXED},
{"keyword", JANET_TFLAG_KEYWORD},
{"nil", JANET_TFLAG_NIL},
{"number", JANET_TFLAG_NUMBER},
{"pointer", JANET_TFLAG_POINTER},
{"string", JANET_TFLAG_STRING},
{"struct", JANET_TFLAG_STRUCT},
{"symbol", JANET_TFLAG_SYMBOL},
{"table", JANET_TFLAG_TABLE},
{"tuple", JANET_TFLAG_TUPLE}
};
/* Deinitialize an Assembler. Does not deinitialize the parents. */
static void janet_asm_deinit(JanetAssembler *a) {
janet_table_deinit(&a->slots);
janet_table_deinit(&a->labels);
janet_table_deinit(&a->envs);
janet_table_deinit(&a->constants);
janet_table_deinit(&a->defs);
}
static void janet_asm_longjmp(JanetAssembler *a) {
#if defined(JANET_BSD) || defined(JANET_APPLE)
_longjmp(a->on_error, 1);
#else
longjmp(a->on_error, 1);
#endif
}
/* Throw some kind of assembly error */
static void janet_asm_error(JanetAssembler *a, const char *message) {
a->errmessage = janet_formatc("%s, instruction %d", message, a->errindex);
janet_asm_longjmp(a);
}
#define janet_asm_assert(a, c, m) do { if (!(c)) janet_asm_error((a), (m)); } while (0)
/* Throw some kind of assembly error */
static void janet_asm_errorv(JanetAssembler *a, const uint8_t *m) {
a->errmessage = m;
janet_asm_longjmp(a);
}
/* Add a closure environment to the assembler. Sub funcdefs may need
* to reference outer function environments, and may change the outer environment.
* Returns the index of the environment in the assembler's environments, or -1
* if not found. */
static int32_t janet_asm_addenv(JanetAssembler *a, Janet envname) {
Janet check;
JanetFuncDef *def = a->def;
int32_t envindex;
int32_t res;
if (janet_equals(a->name, envname)) {
return -1;
}
/* Check for memoized value */
check = janet_table_get(&a->envs, envname);
if (janet_checktype(check, JANET_NUMBER)) {
return (int32_t) janet_unwrap_number(check);
}
if (NULL == a->parent) return -2;
res = janet_asm_addenv(a->parent, envname);
if (res < -1) {
return res;
}
envindex = def->environments_length;
janet_table_put(&a->envs, envname, janet_wrap_number(envindex));
if (envindex >= a->environments_capacity) {
int32_t newcap = 2 * envindex;
def->environments = realloc(def->environments, newcap * sizeof(int32_t));
if (NULL == def->environments) {
JANET_OUT_OF_MEMORY;
}
a->environments_capacity = newcap;
}
def->environments[envindex] = (int32_t) res;
def->environments_length = envindex + 1;
return envindex;
}
/* Parse an argument to an assembly instruction, and return the result as an
* integer. This integer will need to be bounds checked. */
static int32_t doarg_1(
JanetAssembler *a,
enum JanetOpArgType argtype,
Janet x) {
int32_t ret = -1;
JanetTable *c;
switch (argtype) {
default:
c = NULL;
break;
case JANET_OAT_SLOT:
c = &a->slots;
break;
case JANET_OAT_ENVIRONMENT:
c = &a->envs;
break;
case JANET_OAT_CONSTANT:
c = &a->constants;
break;
case JANET_OAT_LABEL:
c = &a->labels;
break;
case JANET_OAT_FUNCDEF:
c = &a->defs;
break;
}
switch (janet_type(x)) {
default:
goto error;
break;
case JANET_NUMBER: {
double y = janet_unwrap_number(x);
if (janet_checkintrange(y)) {
ret = (int32_t) y;
} else {
goto error;
}
break;
}
case JANET_TUPLE: {
const Janet *t = janet_unwrap_tuple(x);
if (argtype == JANET_OAT_TYPE) {
int32_t i = 0;
ret = 0;
for (i = 0; i < janet_tuple_length(t); i++) {
ret |= doarg_1(a, JANET_OAT_SIMPLETYPE, t[i]);
}
} else {
goto error;
}
break;
}
case JANET_KEYWORD: {
if (NULL != c && argtype == JANET_OAT_LABEL) {
Janet result = janet_table_get(c, x);
if (janet_checktype(result, JANET_NUMBER)) {
ret = janet_unwrap_integer(result) - a->bytecode_count;
} else {
goto error;
}
} else if (argtype == JANET_OAT_TYPE || argtype == JANET_OAT_SIMPLETYPE) {
const TypeAlias *alias = janet_strbinsearch(
&type_aliases,
sizeof(type_aliases) / sizeof(TypeAlias),
sizeof(TypeAlias),
janet_unwrap_keyword(x));
if (alias) {
ret = alias->mask;
} else {
janet_asm_errorv(a, janet_formatc("unknown type %v", x));
}
} else {
goto error;
}
break;
}
case JANET_SYMBOL: {
if (NULL != c) {
Janet result = janet_table_get(c, x);
if (janet_checktype(result, JANET_NUMBER)) {
ret = (int32_t) janet_unwrap_number(result);
} else {
janet_asm_errorv(a, janet_formatc("unknown name %v", x));
}
} else {
goto error;
}
if (argtype == JANET_OAT_ENVIRONMENT && ret == -1) {
/* Add a new env */
ret = janet_asm_addenv(a, x);
if (ret < -1) {
janet_asm_errorv(a, janet_formatc("unknown environment %v", x));
}
}
break;
}
}
if (argtype == JANET_OAT_SLOT && ret >= a->def->slotcount)
a->def->slotcount = (int32_t) ret + 1;
return ret;
error:
janet_asm_errorv(a, janet_formatc("error parsing instruction argument %v", x));
return 0;
}
/* Parse a single argument to an instruction. Trims it as well as
* try to convert arguments to bit patterns */
static uint32_t doarg(
JanetAssembler *a,
enum JanetOpArgType argtype,
int nth,
int nbytes,
int hassign,
Janet x) {
int32_t arg = doarg_1(a, argtype, x);
/* Calculate the min and max values that can be stored given
* nbytes, and whether or not the storage is signed */
int32_t max = (1 << ((nbytes << 3) - hassign)) - 1;
int32_t min = hassign ? -max - 1 : 0;
if (arg < min)
janet_asm_errorv(a, janet_formatc("instruction argument %v is too small, must be %d byte%s",
x, nbytes, nbytes > 1 ? "s" : ""));
if (arg > max)
janet_asm_errorv(a, janet_formatc("instruction argument %v is too large, must be %d byte%s",
x, nbytes, nbytes > 1 ? "s" : ""));
return ((uint32_t) arg) << (nth << 3);
}
/* Provide parsing methods for the different kinds of arguments */
static uint32_t read_instruction(
JanetAssembler *a,
const JanetInstructionDef *idef,
const Janet *argt) {
uint32_t instr = idef->opcode;
enum JanetInstructionType type = janet_instructions[idef->opcode];
switch (type) {
case JINT_0: {
if (janet_tuple_length(argt) != 1)
janet_asm_error(a, "expected 0 arguments: (op)");
break;
}
case JINT_S: {
if (janet_tuple_length(argt) != 2)
janet_asm_error(a, "expected 1 argument: (op, slot)");
instr |= doarg(a, JANET_OAT_SLOT, 1, 2, 0, argt[1]);
break;
}
case JINT_L: {
if (janet_tuple_length(argt) != 2)
janet_asm_error(a, "expected 1 argument: (op, label)");
instr |= doarg(a, JANET_OAT_LABEL, 1, 3, 1, argt[1]);
break;
}
case JINT_SS: {
if (janet_tuple_length(argt) != 3)
janet_asm_error(a, "expected 2 arguments: (op, slot, slot)");
instr |= doarg(a, JANET_OAT_SLOT, 1, 1, 0, argt[1]);
instr |= doarg(a, JANET_OAT_SLOT, 2, 2, 0, argt[2]);
break;
}
case JINT_SL: {
if (janet_tuple_length(argt) != 3)
janet_asm_error(a, "expected 2 arguments: (op, slot, label)");
instr |= doarg(a, JANET_OAT_SLOT, 1, 1, 0, argt[1]);
instr |= doarg(a, JANET_OAT_LABEL, 2, 2, 1, argt[2]);
break;
}
case JINT_ST: {
if (janet_tuple_length(argt) != 3)
janet_asm_error(a, "expected 2 arguments: (op, slot, type)");
instr |= doarg(a, JANET_OAT_SLOT, 1, 1, 0, argt[1]);
instr |= doarg(a, JANET_OAT_TYPE, 2, 2, 0, argt[2]);
break;
}
case JINT_SI:
case JINT_SU: {
if (janet_tuple_length(argt) != 3)
janet_asm_error(a, "expected 2 arguments: (op, slot, integer)");
instr |= doarg(a, JANET_OAT_SLOT, 1, 1, 0, argt[1]);
instr |= doarg(a, JANET_OAT_INTEGER, 2, 2, type == JINT_SI, argt[2]);
break;
}
case JINT_SD: {
if (janet_tuple_length(argt) != 3)
janet_asm_error(a, "expected 2 arguments: (op, slot, funcdef)");
instr |= doarg(a, JANET_OAT_SLOT, 1, 1, 0, argt[1]);
instr |= doarg(a, JANET_OAT_FUNCDEF, 2, 2, 0, argt[2]);
break;
}
case JINT_SSS: {
if (janet_tuple_length(argt) != 4)
janet_asm_error(a, "expected 3 arguments: (op, slot, slot, slot)");
instr |= doarg(a, JANET_OAT_SLOT, 1, 1, 0, argt[1]);
instr |= doarg(a, JANET_OAT_SLOT, 2, 1, 0, argt[2]);
instr |= doarg(a, JANET_OAT_SLOT, 3, 1, 0, argt[3]);
break;
}
case JINT_SSI:
case JINT_SSU: {
if (janet_tuple_length(argt) != 4)
janet_asm_error(a, "expected 3 arguments: (op, slot, slot, integer)");
instr |= doarg(a, JANET_OAT_SLOT, 1, 1, 0, argt[1]);
instr |= doarg(a, JANET_OAT_SLOT, 2, 1, 0, argt[2]);
instr |= doarg(a, JANET_OAT_INTEGER, 3, 1, type == JINT_SSI, argt[3]);
break;
}
case JINT_SES: {
JanetAssembler *b = a;
uint32_t env;
if (janet_tuple_length(argt) != 4)
janet_asm_error(a, "expected 3 arguments: (op, slot, environment, envslot)");
instr |= doarg(a, JANET_OAT_SLOT, 1, 1, 0, argt[1]);
env = doarg(a, JANET_OAT_ENVIRONMENT, 0, 1, 0, argt[2]);
instr |= env << 16;
for (env += 1; env > 0; env--) {
b = b->parent;
if (NULL == b)
janet_asm_error(a, "invalid environment index");
}
instr |= doarg(b, JANET_OAT_SLOT, 3, 1, 0, argt[3]);
break;
}
case JINT_SC: {
if (janet_tuple_length(argt) != 3)
janet_asm_error(a, "expected 2 arguments: (op, slot, constant)");
instr |= doarg(a, JANET_OAT_SLOT, 1, 1, 0, argt[1]);
instr |= doarg(a, JANET_OAT_CONSTANT, 2, 2, 0, argt[2]);
break;
}
}
return instr;
}
/* Helper to get from a structure */
static Janet janet_get1(Janet ds, Janet key) {
switch (janet_type(ds)) {
default:
return janet_wrap_nil();
case JANET_TABLE:
return janet_table_get(janet_unwrap_table(ds), key);
case JANET_STRUCT:
return janet_struct_get(janet_unwrap_struct(ds), key);
}
}
/* Helper to assembly. Return the assembly result */
static JanetAssembleResult janet_asm1(JanetAssembler *parent, Janet source, int flags) {
JanetAssembleResult result;
JanetAssembler a;
Janet s = source;
JanetFuncDef *def;
int32_t count, i;
const Janet *arr;
Janet x;
(void) flags;
/* Initialize funcdef */
def = janet_funcdef_alloc();
/* Initialize Assembler */
a.def = def;
a.parent = parent;
a.errmessage = NULL;
a.errindex = 0;
a.environments_capacity = 0;
a.bytecode_count = 0;
a.defs_capacity = 0;
a.name = janet_wrap_nil();
janet_table_init(&a.labels, 0);
janet_table_init(&a.constants, 0);
janet_table_init(&a.slots, 0);
janet_table_init(&a.envs, 0);
janet_table_init(&a.defs, 0);
/* Set error jump */
#if defined(JANET_BSD) || defined(JANET_APPLE)
if (_setjmp(a.on_error)) {
#else
if (setjmp(a.on_error)) {
#endif
if (NULL != a.parent) {
janet_asm_deinit(&a);
janet_asm_longjmp(a.parent);
}
result.funcdef = NULL;
result.error = a.errmessage;
result.status = JANET_ASSEMBLE_ERROR;
janet_asm_deinit(&a);
return result;
}
janet_asm_assert(&a,
janet_checktype(s, JANET_STRUCT) ||
janet_checktype(s, JANET_TABLE),
"expected struct or table for assembly source");
/* Check for function name */
a.name = janet_get1(s, janet_csymbolv("name"));
if (!janet_checktype(a.name, JANET_NIL)) {
def->name = janet_to_string(a.name);
}
/* Set function arity */
x = janet_get1(s, janet_csymbolv("arity"));
def->arity = janet_checkint(x) ? janet_unwrap_integer(x) : 0;
janet_asm_assert(&a, def->arity >= 0, "arity must be non-negative");
x = janet_get1(s, janet_csymbolv("max-arity"));
def->max_arity = janet_checkint(x) ? janet_unwrap_integer(x) : def->arity;
janet_asm_assert(&a, def->max_arity >= def->arity, "max-arity must be greater than or equal to arity");
x = janet_get1(s, janet_csymbolv("min-arity"));
def->min_arity = janet_checkint(x) ? janet_unwrap_integer(x) : def->arity;
janet_asm_assert(&a, def->min_arity <= def->arity, "min-arity must be less than or equal to arity");
/* Check vararg */
x = janet_get1(s, janet_csymbolv("vararg"));
if (janet_truthy(x)) def->flags |= JANET_FUNCDEF_FLAG_VARARG;
/* Check source */
x = janet_get1(s, janet_csymbolv("source"));
if (janet_checktype(x, JANET_STRING)) def->source = janet_unwrap_string(x);
/* Create slot aliases */
x = janet_get1(s, janet_csymbolv("slots"));
if (janet_indexed_view(x, &arr, &count)) {
for (i = 0; i < count; i++) {
Janet v = arr[i];
if (janet_checktype(v, JANET_TUPLE)) {
const Janet *t = janet_unwrap_tuple(v);
int32_t j;
for (j = 0; j < janet_tuple_length(t); j++) {
if (!janet_checktype(t[j], JANET_SYMBOL))
janet_asm_error(&a, "slot names must be symbols");
janet_table_put(&a.slots, t[j], janet_wrap_integer(i));
}
} else if (janet_checktype(v, JANET_SYMBOL)) {
janet_table_put(&a.slots, v, janet_wrap_integer(i));
} else {
janet_asm_error(&a, "slot names must be symbols or tuple of symbols");
}
}
}
/* Parse constants */
x = janet_get1(s, janet_csymbolv("constants"));
if (janet_indexed_view(x, &arr, &count)) {
def->constants_length = count;
def->constants = malloc(sizeof(Janet) * (size_t) count);
if (NULL == def->constants) {
JANET_OUT_OF_MEMORY;
}
for (i = 0; i < count; i++) {
Janet ct = arr[i];
if (janet_checktype(ct, JANET_TUPLE) &&
janet_tuple_length(janet_unwrap_tuple(ct)) > 1 &&
janet_checktype(janet_unwrap_tuple(ct)[0], JANET_SYMBOL)) {
const Janet *t = janet_unwrap_tuple(ct);
int32_t tcount = janet_tuple_length(t);
const uint8_t *macro = janet_unwrap_symbol(t[0]);
if (0 == janet_cstrcmp(macro, "quote")) {
def->constants[i] = t[1];
} else if (tcount == 3 &&
janet_checktype(t[1], JANET_SYMBOL) &&
0 == janet_cstrcmp(macro, "def")) {
def->constants[i] = t[2];
janet_table_put(&a.constants, t[1], janet_wrap_integer(i));
} else {
janet_asm_errorv(&a, janet_formatc("could not parse constant \"%v\"", ct));
}
} else {
def->constants[i] = ct;
}
}
} else {
def->constants = NULL;
def->constants_length = 0;
}
/* Parse sub funcdefs */
x = janet_get1(s, janet_csymbolv("closures"));
if (janet_indexed_view(x, &arr, &count)) {
int32_t i;
for (i = 0; i < count; i++) {
JanetAssembleResult subres;
Janet subname;
int32_t newlen;
subres = janet_asm1(&a, arr[i], flags);
if (subres.status != JANET_ASSEMBLE_OK) {
janet_asm_errorv(&a, subres.error);
}
subname = janet_get1(arr[i], janet_csymbolv("name"));
if (!janet_checktype(subname, JANET_NIL)) {
janet_table_put(&a.defs, subname, janet_wrap_integer(def->defs_length));
}
newlen = def->defs_length + 1;
if (a.defs_capacity < newlen) {
int32_t newcap = newlen;
def->defs = realloc(def->defs, newcap * sizeof(JanetFuncDef *));
if (NULL == def->defs) {
JANET_OUT_OF_MEMORY;
}
a.defs_capacity = newcap;
}
def->defs[def->defs_length] = subres.funcdef;
def->defs_length = newlen;
}
}
/* Parse bytecode and labels */
x = janet_get1(s, janet_csymbolv("bytecode"));
if (janet_indexed_view(x, &arr, &count)) {
/* Do labels and find length */
int32_t blength = 0;
for (i = 0; i < count; ++i) {
Janet instr = arr[i];
if (janet_checktype(instr, JANET_KEYWORD)) {
janet_table_put(&a.labels, instr, janet_wrap_integer(blength));
} else if (janet_checktype(instr, JANET_TUPLE)) {
blength++;
} else {
a.errindex = i;
janet_asm_error(&a, "expected assembly instruction");
}
}
/* Allocate bytecode array */
def->bytecode_length = blength;
def->bytecode = malloc(sizeof(uint32_t) * (size_t) blength);
if (NULL == def->bytecode) {
JANET_OUT_OF_MEMORY;
}
/* Do bytecode */
for (i = 0; i < count; ++i) {
Janet instr = arr[i];
if (janet_checktype(instr, JANET_KEYWORD)) {
continue;
} else {
uint32_t op;
const JanetInstructionDef *idef;
const Janet *t;
a.errindex = i;
janet_asm_assert(&a, janet_checktype(instr, JANET_TUPLE), "expected tuple");
t = janet_unwrap_tuple(instr);
if (janet_tuple_length(t) == 0) {
op = 0;
} else {
janet_asm_assert(&a, janet_checktype(t[0], JANET_SYMBOL),
"expected symbol in assembly instruction");
idef = janet_strbinsearch(
&janet_ops,
sizeof(janet_ops) / sizeof(JanetInstructionDef),
sizeof(JanetInstructionDef),
janet_unwrap_symbol(t[0]));
if (NULL == idef)
janet_asm_errorv(&a, janet_formatc("unknown instruction %v", t[0]));
op = read_instruction(&a, idef, t);
}
def->bytecode[a.bytecode_count++] = op;
}
}
} else {
janet_asm_error(&a, "bytecode expected");
}
a.errindex = -1;
/* Check for source mapping */
x = janet_get1(s, janet_csymbolv("sourcemap"));
if (janet_indexed_view(x, &arr, &count)) {
janet_asm_assert(&a, count == def->bytecode_length, "sourcemap must have the same length as the bytecode");
def->sourcemap = malloc(sizeof(JanetSourceMapping) * (size_t) count);
if (NULL == def->sourcemap) {
JANET_OUT_OF_MEMORY;
}
for (i = 0; i < count; i++) {
const Janet *tup;
Janet entry = arr[i];
JanetSourceMapping mapping;
if (!janet_checktype(entry, JANET_TUPLE)) {
janet_asm_error(&a, "expected tuple");
}
tup = janet_unwrap_tuple(entry);
if (!janet_checkint(tup[0])) {
janet_asm_error(&a, "expected integer");
}
if (!janet_checkint(tup[1])) {
janet_asm_error(&a, "expected integer");
}
mapping.line = janet_unwrap_integer(tup[0]);
mapping.column = janet_unwrap_integer(tup[1]);
def->sourcemap[i] = mapping;
}
}
/* Set environments */
def->environments =
realloc(def->environments, def->environments_length * sizeof(int32_t));
if (NULL == def->environments) {
JANET_OUT_OF_MEMORY;
}
/* Verify the func def */
if (janet_verify(def)) {
janet_asm_error(&a, "invalid assembly");
}
/* Finish everything and return funcdef */
janet_asm_deinit(&a);
result.error = NULL;
result.funcdef = def;
result.status = JANET_ASSEMBLE_OK;
return result;
}
/* Assemble a function */
JanetAssembleResult janet_asm(Janet source, int flags) {
return janet_asm1(NULL, source, flags);
}
/* Disassembly */
/* Find the definition of an instruction given the instruction word. Return
* NULL if not found. */
static const JanetInstructionDef *janet_asm_reverse_lookup(uint32_t instr) {
size_t i;
uint32_t opcode = instr & 0x7F;
for (i = 0; i < sizeof(janet_ops) / sizeof(JanetInstructionDef); i++) {
const JanetInstructionDef *def = janet_ops + i;
if (def->opcode == opcode)
return def;
}
return NULL;
}
/* Create some constant sized tuples */
static const Janet *tup1(Janet x) {
Janet *tup = janet_tuple_begin(1);
tup[0] = x;
return janet_tuple_end(tup);
}
static const Janet *tup2(Janet x, Janet y) {
Janet *tup = janet_tuple_begin(2);
tup[0] = x;
tup[1] = y;
return janet_tuple_end(tup);
}
static const Janet *tup3(Janet x, Janet y, Janet z) {
Janet *tup = janet_tuple_begin(3);
tup[0] = x;
tup[1] = y;
tup[2] = z;
return janet_tuple_end(tup);
}
static const Janet *tup4(Janet w, Janet x, Janet y, Janet z) {
Janet *tup = janet_tuple_begin(4);
tup[0] = w;
tup[1] = x;
tup[2] = y;
tup[3] = z;
return janet_tuple_end(tup);
}
/* Given an argument, convert it to the appropriate integer or symbol */
Janet janet_asm_decode_instruction(uint32_t instr) {
const JanetInstructionDef *def = janet_asm_reverse_lookup(instr);
Janet name;
if (NULL == def) {
return janet_wrap_integer((int32_t)instr);
}
name = janet_csymbolv(def->name);
const Janet *ret = NULL;
#define oparg(shift, mask) ((instr >> ((shift) << 3)) & (mask))
switch (janet_instructions[def->opcode]) {
case JINT_0:
ret = tup1(name);
break;
case JINT_S:
ret = tup2(name, janet_wrap_integer(oparg(1, 0xFFFFFF)));
break;
case JINT_L:
ret = tup2(name, janet_wrap_integer((int32_t)instr >> 8));
break;
case JINT_SS:
case JINT_ST:
case JINT_SC:
case JINT_SU:
case JINT_SD:
ret = tup3(name,
janet_wrap_integer(oparg(1, 0xFF)),
janet_wrap_integer(oparg(2, 0xFFFF)));
break;
case JINT_SI:
case JINT_SL:
ret = tup3(name,
janet_wrap_integer(oparg(1, 0xFF)),
janet_wrap_integer((int32_t)instr >> 16));
break;
case JINT_SSS:
case JINT_SES:
case JINT_SSU:
ret = tup4(name,
janet_wrap_integer(oparg(1, 0xFF)),
janet_wrap_integer(oparg(2, 0xFF)),
janet_wrap_integer(oparg(3, 0xFF)));
break;
case JINT_SSI:
ret = tup4(name,
janet_wrap_integer(oparg(1, 0xFF)),
janet_wrap_integer(oparg(2, 0xFF)),
janet_wrap_integer((int32_t)instr >> 24));
break;
}
#undef oparg
if (ret) {
/* Check if break point set */
if (instr & 0x80) {
janet_tuple_flag(ret) |= JANET_TUPLE_FLAG_BRACKETCTOR;
}
return janet_wrap_tuple(ret);
}
return janet_wrap_nil();
}
Janet janet_disasm(JanetFuncDef *def) {
int32_t i;
JanetArray *bcode = janet_array(def->bytecode_length);
JanetArray *constants;
JanetTable *ret = janet_table(10);
janet_table_put(ret, janet_csymbolv("arity"), janet_wrap_integer(def->arity));
janet_table_put(ret, janet_csymbolv("min-arity"), janet_wrap_integer(def->min_arity));
janet_table_put(ret, janet_csymbolv("max-arity"), janet_wrap_integer(def->max_arity));
janet_table_put(ret, janet_csymbolv("bytecode"), janet_wrap_array(bcode));
if (NULL != def->source) {
janet_table_put(ret, janet_csymbolv("source"), janet_wrap_string(def->source));
}
if (def->flags & JANET_FUNCDEF_FLAG_VARARG) {
janet_table_put(ret, janet_csymbolv("vararg"), janet_wrap_true());
}
if (NULL != def->name) {
janet_table_put(ret, janet_csymbolv("name"), janet_wrap_string(def->name));
}
/* Add constants */
if (def->constants_length > 0) {
constants = janet_array(def->constants_length);
janet_table_put(ret, janet_csymbolv("constants"), janet_wrap_array(constants));
for (i = 0; i < def->constants_length; i++) {
Janet src = def->constants[i];
Janet dest;
if (janet_checktype(src, JANET_TUPLE)) {
dest = janet_wrap_tuple(tup2(janet_csymbolv("quote"), src));
} else {
dest = src;
}
constants->data[i] = dest;
}
constants->count = def->constants_length;
}
/* Add bytecode */
for (i = 0; i < def->bytecode_length; i++) {
bcode->data[i] = janet_asm_decode_instruction(def->bytecode[i]);
}
bcode->count = def->bytecode_length;
/* Add source map */
if (NULL != def->sourcemap) {
JanetArray *sourcemap = janet_array(def->bytecode_length);
for (i = 0; i < def->bytecode_length; i++) {
Janet *t = janet_tuple_begin(2);
JanetSourceMapping mapping = def->sourcemap[i];
t[0] = janet_wrap_integer(mapping.line);
t[1] = janet_wrap_integer(mapping.column);
sourcemap->data[i] = janet_wrap_tuple(janet_tuple_end(t));
}
sourcemap->count = def->bytecode_length;
janet_table_put(ret, janet_csymbolv("sourcemap"), janet_wrap_array(sourcemap));
}
/* Add environments */
if (NULL != def->environments) {
JanetArray *envs = janet_array(def->environments_length);
for (i = 0; i < def->environments_length; i++) {
envs->data[i] = janet_wrap_integer(def->environments[i]);
}
envs->count = def->environments_length;
janet_table_put(ret, janet_csymbolv("environments"), janet_wrap_array(envs));
}
/* Add closures */
/* Funcdefs cannot be recursive */
if (NULL != def->defs) {
JanetArray *defs = janet_array(def->defs_length);
for (i = 0; i < def->defs_length; i++) {
defs->data[i] = janet_disasm(def->defs[i]);
}
defs->count = def->defs_length;
janet_table_put(ret, janet_csymbolv("defs"), janet_wrap_array(defs));
}
/* Add slotcount */
janet_table_put(ret, janet_csymbolv("slotcount"), janet_wrap_integer(def->slotcount));
return janet_wrap_struct(janet_table_to_struct(ret));
}
/* C Function for assembly */
static Janet cfun_asm(int32_t argc, Janet *argv) {
janet_arity(argc, 1, 1);
JanetAssembleResult res;
res = janet_asm(argv[0], 0);
if (res.status != JANET_ASSEMBLE_OK) {
janet_panics(res.error);
}
return janet_wrap_function(janet_thunk(res.funcdef));
}
static Janet cfun_disasm(int32_t argc, Janet *argv) {
janet_arity(argc, 1, 1);
JanetFunction *f = janet_getfunction(argv, 0);
return janet_disasm(f->def);
}
static const JanetReg asm_cfuns[] = {
{
"asm", cfun_asm,
JDOC("(asm assembly)\n\n"
"Returns a new function that is the compiled result of the assembly.\n"
"The syntax for the assembly can be found on the Janet website. Will throw an\n"
"error on invalid assembly.")
},
{
"disasm", cfun_disasm,
JDOC("(disasm func)\n\n"
"Returns assembly that could be used be compile the given function.\n"
"func must be a function, not a c function. Will throw on error on a badly\n"
"typed argument.")
},
{NULL, NULL, NULL}
};
/* Load the library */
void janet_lib_asm(JanetTable *env) {
janet_core_cfuns(env, NULL, asm_cfuns);
}
#endif
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