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f8174f192c
janet/core/asm.c
bakpakin f8174f192c Fix some vararg behavior in tail calls.
2018-01-12 13:54:37 -05:00

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/*
* Copyright (c) 2017 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.
*/
#include <setjmp.h>
#include <dst/dst.h>
#include "opcodes.h"
#include "gc.h"
#include "sourcemap.h"
#include "util.h"
/* Bytecode op argument types */
typedef enum DstOpArgType DstOpArgType;
enum DstOpArgType {
DST_OAT_SLOT,
DST_OAT_ENVIRONMENT,
DST_OAT_CONSTANT,
DST_OAT_INTEGER,
DST_OAT_TYPE,
DST_OAT_SIMPLETYPE,
DST_OAT_LABEL,
DST_OAT_FUNCDEF
};
/* Convert a slot to to an integer for bytecode */
/* Types of instructions (some of them) */
/* _0arg - op.---.--.-- (return-nil, noop, vararg arguments)
* _s - op.src.--.-- (push1)
* _l - op.XX.XX.XX (jump)
* _ss - op.dest.XX.XX (move, swap)
* _sl - op.check.XX.XX (jump-if)
* _st - op.check.TT.TT (typecheck)
* _si - op.dest.XX.XX (load-integer)
* _sss - op.dest.op1.op2 (add, subtract, arithmetic, comparison)
* _ses - op.dest.up.which (load-upvalue, save-upvalue)
* _sc - op.dest.CC.CC (load-constant, closure)
*/
/* Various types of instructions */
typedef enum DstInstructionType DstInstructionType;
enum DstInstructionType {
DIT_0, /* No args */
DIT_S, /* One slot */
DIT_L, /* One label */
DIT_SS, /* Two slots */
DIT_SL,
DIT_ST,
DIT_SI,
DIT_SD, /* Closures (D for funcDef) */
DIT_SU, /* Unsigned */
DIT_SSS,
DIT_SSI,
DIT_SSU,
DIT_SES,
DIT_SC
};
/* Definition for an instruction in the assembler */
typedef struct DstInstructionDef DstInstructionDef;
struct DstInstructionDef {
const char *name;
DstInstructionType type;
DstOpCode opcode;
};
/* Hold all state needed during assembly */
typedef struct DstAssembler DstAssembler;
struct DstAssembler {
DstAssembler *parent;
DstFuncDef *def;
jmp_buf on_error;
const uint8_t *errmessage;
int32_t environments_capacity;
int32_t defs_capacity;
int32_t bytecode_count; /* Used for calculating labels */
Dst name;
DstTable labels; /* symbol -> bytecode index */
DstTable constants; /* symbol -> constant index */
DstTable slots; /* symbol -> slot index */
DstTable envs; /* symbol -> environment index */
DstTable defs; /* symbol -> funcdefs index */
};
/* Dst opcode descriptions in lexographic 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 DstInstructionDef dst_ops[] = {
{"add", DIT_SSS, DOP_ADD},
{"add-immediate", DIT_SSI, DOP_ADD_IMMEDIATE},
{"add-integer", DIT_SSS, DOP_ADD_INTEGER},
{"add-real", DIT_SSS, DOP_ADD_REAL},
{"band", DIT_SSS, DOP_BAND},
{"bnot", DIT_SS, DOP_BNOT},
{"bor", DIT_SSS, DOP_BOR},
{"bxor", DIT_SSS, DOP_BXOR},
{"call", DIT_SS, DOP_CALL},
{"closure", DIT_SD, DOP_CLOSURE},
{"compare", DIT_SSS, DOP_COMPARE},
{"divide", DIT_SSS, DOP_DIVIDE},
{"divide-immediate", DIT_SSI, DOP_DIVIDE_IMMEDIATE},
{"divide-integer", DIT_SSS, DOP_DIVIDE_INTEGER},
{"divide-real", DIT_SSS, DOP_DIVIDE_REAL},
{"equals", DIT_SSS, DOP_EQUALS},
{"error", DIT_S, DOP_ERROR},
{"get", DIT_SSS, DOP_GET},
{"get-index", DIT_SSU, DOP_GET_INDEX},
{"greater-than", DIT_SSS, DOP_GREATER_THAN},
{"jump", DIT_L, DOP_JUMP},
{"jump-if", DIT_SL, DOP_JUMP_IF},
{"jump-if-not", DIT_SL, DOP_JUMP_IF_NOT},
{"less-than", DIT_SSS, DOP_LESS_THAN},
{"load-constant", DIT_SC, DOP_LOAD_CONSTANT},
{"load-false", DIT_S, DOP_LOAD_FALSE},
{"load-integer", DIT_SI, DOP_LOAD_INTEGER},
{"load-nil", DIT_S, DOP_LOAD_NIL},
{"load-self", DIT_S, DOP_LOAD_SELF},
{"load-true", DIT_S, DOP_LOAD_TRUE},
{"load-upvalue", DIT_SES, DOP_LOAD_UPVALUE},
{"move-far", DIT_SS, DOP_MOVE_FAR},
{"move-near", DIT_SS, DOP_MOVE_NEAR},
{"multiply", DIT_SSS, DOP_MULTIPLY},
{"multiply-immediate", DIT_SSI, DOP_MULTIPLY_IMMEDIATE},
{"multiply-integer", DIT_SSS, DOP_MULTIPLY_INTEGER},
{"multiply-real", DIT_SSS, DOP_MULTIPLY_REAL},
{"noop", DIT_0, DOP_NOOP},
{"push", DIT_S, DOP_PUSH},
{"push-array", DIT_S, DOP_PUSH_ARRAY},
{"push2", DIT_SS, DOP_PUSH_2},
{"push3", DIT_SSS, DOP_PUSH_3},
{"put", DIT_SSS, DOP_PUT},
{"put-index", DIT_SSU, DOP_PUT_INDEX},
{"return", DIT_S, DOP_RETURN},
{"return-nil", DIT_0, DOP_RETURN_NIL},
{"set-upvalue", DIT_SES, DOP_SET_UPVALUE},
{"shift-left", DIT_SSS, DOP_SHIFT_LEFT},
{"shift-left-immediate", DIT_SSI, DOP_SHIFT_LEFT_IMMEDIATE},
{"shift-right", DIT_SSS, DOP_SHIFT_RIGHT},
{"shift-right-immediate", DIT_SSI, DOP_SHIFT_RIGHT_IMMEDIATE},
{"shift-right-unsigned", DIT_SSS, DOP_SHIFT_RIGHT_UNSIGNED},
{"shift-right-unsigned-immediate", DIT_SSS, DOP_SHIFT_RIGHT_UNSIGNED_IMMEDIATE},
{"subtract", DIT_SSS, DOP_SUBTRACT},
{"tailcall", DIT_S, DOP_TAILCALL},
{"transfer", DIT_SSS, DOP_TRANSFER},
{"typecheck", DIT_ST, DOP_TYPECHECK},
};
/* Check a dst string against a bunch of test_strings. Return the
* index of the matching test_string, or -1 if not found. */
static int32_t strsearch(const uint8_t *str, const char **test_strings) {
int32_t len = dst_string_length(str);
int index;
for (index = 0; ; index++) {
int32_t i;
const char *testword = test_strings[index];
if (NULL == testword)
break;
for (i = 0; i < len; i++) {
if (testword[i] != str[i])
goto nextword;
}
return index;
nextword:
continue;
}
return -1;
}
/* Deinitialize an Assembler. Does not deinitialize the parents. */
static void dst_asm_deinit(DstAssembler *a) {
dst_table_deinit(&a->slots);
dst_table_deinit(&a->labels);
dst_table_deinit(&a->envs);
dst_table_deinit(&a->constants);
dst_table_deinit(&a->defs);
}
/* Throw some kind of assembly error */
static void dst_asm_error(DstAssembler *a, const char *message) {
a->errmessage = dst_cstring(message);
longjmp(a->on_error, 1);
}
#define dst_asm_assert(a, c, m) do { if (!(c)) dst_asm_error((a), (m)); } while (0)
/* Throw some kind of assembly error */
static void dst_asm_errorv(DstAssembler *a, const uint8_t *m) {
a->errmessage = m;
longjmp(a->on_error, 1);
}
/* 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 dst_asm_addenv(DstAssembler *a, Dst envname) {
Dst check;
DstFuncDef *def = a->def;
int32_t envindex;
int32_t res;
if (dst_equals(a->name, envname)) {
return 0;
}
/* Check for memoized value */
check = dst_table_get(&a->envs, envname);
if (dst_checktype(check, DST_INTEGER)) return dst_unwrap_integer(check);
if (NULL == a->parent) return -1;
res = dst_asm_addenv(a->parent, envname);
if (res < 0)
return res;
envindex = def->environments_length;
if (envindex == 0) envindex = 1;
dst_table_put(&a->envs, envname, dst_wrap_integer(envindex));
if (envindex >= a->environments_capacity) {
int32_t newcap = 2 * envindex;
def->environments = realloc(def->environments, newcap * sizeof(int32_t));
if (NULL == def->environments) {
DST_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(
DstAssembler *a,
DstOpArgType argtype,
Dst x) {
int32_t ret = -1;
DstTable *c;
switch (argtype) {
case DST_OAT_SLOT:
c = &a->slots;
break;
case DST_OAT_ENVIRONMENT:
c = &a->envs;
break;
case DST_OAT_CONSTANT:
c = &a->constants;
break;
case DST_OAT_INTEGER:
c = NULL;
break;
case DST_OAT_TYPE:
case DST_OAT_SIMPLETYPE:
c = NULL;
break;
case DST_OAT_LABEL:
c = &a->labels;
break;
case DST_OAT_FUNCDEF:
c = &a->defs;
break;
}
switch (dst_type(x)) {
default:
goto error;
break;
case DST_INTEGER:
ret = dst_unwrap_integer(x);
break;
case DST_TUPLE:
{
const Dst *t = dst_unwrap_tuple(x);
if (argtype == DST_OAT_TYPE) {
int32_t i = 0;
ret = 0;
for (i = 0; i < dst_tuple_length(t); i++) {
ret |= doarg_1(a, DST_OAT_SIMPLETYPE, t[i]);
}
} else {
goto error;
}
break;
}
case DST_SYMBOL:
{
if (NULL != c) {
Dst result = dst_table_get(c, x);
if (dst_checktype(result, DST_INTEGER)) {
if (argtype == DST_OAT_LABEL) {
ret = dst_unwrap_integer(result) - a->bytecode_count;
} else {
ret = dst_unwrap_integer(result);
}
} else {
dst_asm_errorv(a, dst_formatc("unknown name %q", x));
}
} else if (argtype == DST_OAT_TYPE || argtype == DST_OAT_SIMPLETYPE) {
int32_t index = strsearch(dst_unwrap_symbol(x), dst_type_names);
if (index != -1) {
ret = index;
} else {
dst_asm_errorv(a, dst_formatc("unknown type %q", x));
}
} else {
goto error;
}
if (argtype == DST_OAT_ENVIRONMENT && ret == -1) {
/* Add a new env */
ret = dst_asm_addenv(a, x);
if (ret < 0) {
dst_asm_errorv(a, dst_formatc("unknown environment %q", x));
}
}
break;
}
}
if (argtype == DST_OAT_SLOT && ret >= a->def->slotcount)
a->def->slotcount = (int32_t) ret + 1;
return ret;
error:
dst_asm_errorv(a, dst_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(
DstAssembler *a,
DstOpArgType argtype,
int nth,
int nbytes,
int hassign,
Dst 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 min = (-hassign) << ((nbytes << 3) - 1);
int32_t max = ~((-1) << ((nbytes << 3) - hassign));
if (arg < min)
dst_asm_errorv(a, dst_formatc("instruction argument %v is too small, must be %d byte%s",
x, nbytes, nbytes > 1 ? "s" : ""));
if (arg > max)
dst_asm_errorv(a, dst_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(
DstAssembler *a,
const DstInstructionDef *idef,
const Dst *argt) {
uint32_t instr = idef->opcode;
switch (idef->type) {
case DIT_0:
{
if (dst_tuple_length(argt) != 1)
dst_asm_error(a, "expected 0 arguments: (op)");
break;
}
case DIT_S:
{
if (dst_tuple_length(argt) != 2)
dst_asm_error(a, "expected 1 argument: (op, slot)");
instr |= doarg(a, DST_OAT_SLOT, 1, 3, 0, argt[1]);
break;
}
case DIT_L:
{
if (dst_tuple_length(argt) != 2)
dst_asm_error(a, "expected 1 argument: (op, label)");
instr |= doarg(a, DST_OAT_LABEL, 1, 3, 1, argt[1]);
break;
}
case DIT_SS:
{
if (dst_tuple_length(argt) != 3)
dst_asm_error(a, "expected 2 arguments: (op, slot, slot)");
instr |= doarg(a, DST_OAT_SLOT, 1, 1, 0, argt[1]);
instr |= doarg(a, DST_OAT_SLOT, 2, 2, 0, argt[2]);
break;
}
case DIT_SL:
{
if (dst_tuple_length(argt) != 3)
dst_asm_error(a, "expected 2 arguments: (op, slot, label)");
instr |= doarg(a, DST_OAT_SLOT, 1, 1, 0, argt[1]);
instr |= doarg(a, DST_OAT_LABEL, 2, 2, 1, argt[2]);
break;
}
case DIT_ST:
{
if (dst_tuple_length(argt) != 3)
dst_asm_error(a, "expected 2 arguments: (op, slot, type)");
instr |= doarg(a, DST_OAT_SLOT, 1, 1, 0, argt[1]);
instr |= doarg(a, DST_OAT_TYPE, 2, 2, 0, argt[2]);
break;
}
case DIT_SI:
case DIT_SU:
{
if (dst_tuple_length(argt) != 3)
dst_asm_error(a, "expected 2 arguments: (op, slot, integer)");
instr |= doarg(a, DST_OAT_SLOT, 1, 1, 0, argt[1]);
instr |= doarg(a, DST_OAT_INTEGER, 2, 2, idef->type == DIT_SI, argt[2]);
break;
}
case DIT_SD:
{
if (dst_tuple_length(argt) != 3)
dst_asm_error(a, "expected 2 arguments: (op, slot, funcdef)");
instr |= doarg(a, DST_OAT_SLOT, 1, 1, 0, argt[1]);
instr |= doarg(a, DST_OAT_FUNCDEF, 2, 2, 0, argt[2]);
break;
}
case DIT_SSS:
{
if (dst_tuple_length(argt) != 4)
dst_asm_error(a, "expected 3 arguments: (op, slot, slot, slot)");
instr |= doarg(a, DST_OAT_SLOT, 1, 1, 0, argt[1]);
instr |= doarg(a, DST_OAT_SLOT, 2, 1, 0, argt[2]);
instr |= doarg(a, DST_OAT_SLOT, 3, 1, 0, argt[3]);
break;
}
case DIT_SSI:
case DIT_SSU:
{
if (dst_tuple_length(argt) != 4)
dst_asm_error(a, "expected 3 arguments: (op, slot, slot, integer)");
instr |= doarg(a, DST_OAT_SLOT, 1, 1, 0, argt[1]);
instr |= doarg(a, DST_OAT_SLOT, 2, 1, 0, argt[2]);
instr |= doarg(a, DST_OAT_INTEGER, 3, 1, idef->type == DIT_SSI, argt[3]);
break;
}
case DIT_SES:
{
DstAssembler *b = a;
uint32_t env;
if (dst_tuple_length(argt) != 4)
dst_asm_error(a, "expected 3 arguments: (op, slot, environment, envslot)");
instr |= doarg(a, DST_OAT_SLOT, 1, 1, 0, argt[1]);
env = doarg(a, DST_OAT_ENVIRONMENT, 0, 1, 0, argt[2]);
instr |= env << 16;
for (env += 1; env > 0; env--) {
b = b->parent;
if (NULL == b)
dst_asm_error(a, "invalid environment index");
}
instr |= doarg(b, DST_OAT_SLOT, 3, 1, 0, argt[3]);
break;
}
case DIT_SC:
{
if (dst_tuple_length(argt) != 3)
dst_asm_error(a, "expected 2 arguments: (op, slot, constant)");
instr |= doarg(a, DST_OAT_SLOT, 1, 1, 0, argt[1]);
instr |= doarg(a, DST_OAT_CONSTANT, 2, 2, 0, argt[2]);
break;
}
}
return instr;
}
/* Helper to assembly. Return the assembly result */
static DstAssembleResult dst_asm1(DstAssembler *parent, DstAssembleOptions opts) {
DstAssembleResult result;
DstAssembler a;
Dst s = opts.source;
DstFuncDef *def;
int32_t count, i;
const Dst *arr;
Dst x;
/* Initialize funcdef */
def = dst_gcalloc(DST_MEMORY_FUNCDEF, sizeof(DstFuncDef));
def->environments = NULL;
def->constants = NULL;
def->bytecode = NULL;
def->flags = 0;
def->slotcount = 0;
def->arity = 0;
def->source = NULL;
def->sourcepath = NULL;
def->sourcemap = NULL;
def->defs = NULL;
def->defs_length = 0;
def->constants_length = 0;
def->bytecode_length = 0;
def->environments_length = 1;
/* Initialize Assembler */
a.def = def;
a.parent = parent;
a.errmessage = NULL;
a.environments_capacity = 0;
a.bytecode_count = 0;
a.defs_capacity = 0;
a.name = dst_wrap_nil();
dst_table_init(&a.labels, 0);
dst_table_init(&a.constants, 0);
dst_table_init(&a.slots, 0);
dst_table_init(&a.envs, 0);
dst_table_init(&a.defs, 0);
/* Set error jump */
if (setjmp(a.on_error)) {
if (NULL != a.parent) {
dst_asm_deinit(&a);
longjmp(a.parent->on_error, 1);
}
result.error = a.errmessage;
result.status = DST_ASSEMBLE_ERROR;
dst_asm_deinit(&a);
return result;
}
dst_asm_assert(&a,
dst_checktype(s, DST_STRUCT) ||
dst_checktype(s, DST_TABLE),
"expected struct or table for assembly source");
/* Check for function name */
a.name = dst_get(s, dst_csymbolv("name"));
/* Set function arity */
x = dst_get(s, dst_csymbolv("arity"));
def->arity = dst_checktype(x, DST_INTEGER) ? dst_unwrap_integer(x) : 0;
/* Check vararg */
x = dst_get(s, dst_csymbolv("vararg"));
if (dst_truthy(x)) def->flags |= DST_FUNCDEF_FLAG_VARARG;
/* Check source */
x = dst_get(s, dst_csymbolv("source"));
if (dst_checktype(x, DST_STRING)) def->source = dst_unwrap_string(x);
/* Check source path */
x = dst_get(s, dst_csymbolv("sourcepath"));
if (dst_checktype(x, DST_STRING)) def->sourcepath = dst_unwrap_string(x);
/* Create slot aliases */
x = dst_get(s, dst_csymbolv("slots"));
if (dst_seq_view(x, &arr, &count)) {
for (i = 0; i < count; i++) {
Dst v = arr[i];
if (dst_checktype(v, DST_TUPLE)) {
const Dst *t = dst_unwrap_tuple(v);
int32_t j;
for (j = 0; j < dst_tuple_length(t); j++) {
if (!dst_checktype(t[j], DST_SYMBOL))
dst_asm_error(&a, "slot names must be symbols");
dst_table_put(&a.slots, t[j], dst_wrap_integer(i));
}
} else if (dst_checktype(v, DST_SYMBOL)) {
dst_table_put(&a.slots, v, dst_wrap_integer(i));
} else {
dst_asm_error(&a, "slot names must be symbols or tuple of symbols");
}
}
}
/* Parse constants */
x = dst_get(s, dst_csymbolv("constants"));
if (dst_seq_view(x, &arr, &count)) {
def->constants_length = count;
def->constants = malloc(sizeof(Dst) * count);
if (NULL == def->constants) {
DST_OUT_OF_MEMORY;
}
for (i = 0; i < count; i++) {
Dst ct = arr[i];
if (dst_checktype(ct, DST_TUPLE) &&
dst_tuple_length(dst_unwrap_tuple(ct)) > 1 &&
dst_checktype(dst_unwrap_tuple(ct)[0], DST_SYMBOL)) {
const Dst *t = dst_unwrap_tuple(ct);
int32_t tcount = dst_tuple_length(t);
const uint8_t *macro = dst_unwrap_symbol(t[0]);
if (0 == dst_cstrcmp(macro, "quote")) {
def->constants[i] = t[1];
} else if (tcount == 3 &&
dst_checktype(t[1], DST_SYMBOL) &&
0 == dst_cstrcmp(macro, "def")) {
def->constants[i] = t[2];
dst_table_put(&a.constants, t[1], dst_wrap_integer(i));
} else {
dst_asm_errorv(&a, dst_formatc("could not parse constant \"%v\"", ct));
}
} else {
def->constants[i] = ct;
}
}
} else {
def->constants = NULL;
def->constants_length = 0;
}
/* Parse sub funcdefs */
x = dst_get(s, dst_csymbolv("closures"));
if (dst_seq_view(x, &arr, &count)) {
int32_t i;
for (i = 0; i < count; i++) {
DstAssembleResult subres;
DstAssembleOptions subopts;
Dst subname;
int32_t newlen;
subopts.source = arr[i];
subopts.flags = opts.flags;
subres = dst_asm1(&a, subopts);
if (subres.status != DST_ASSEMBLE_OK) {
dst_asm_errorv(&a, subres.error);
}
subname = dst_get(arr[i], dst_csymbolv("name"));
if (!dst_checktype(subname, DST_NIL)) {
dst_table_put(&a.defs, subname, dst_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(DstFuncDef *));
if (NULL == def->defs) {
DST_OUT_OF_MEMORY;
}
a.defs_capacity = newcap;
}
def->defs[def->defs_length] = subres.funcdef;
def->defs_length = newlen;
}
}
/* Parse bytecode and labels */
x = dst_get(s, dst_csymbolv("bytecode"));
if (dst_seq_view(x, &arr, &count)) {
/* Do labels and find length */
int32_t blength = 0;
for (i = 0; i < count; ++i) {
Dst instr = arr[i];
if (dst_checktype(instr, DST_SYMBOL)) {
dst_table_put(&a.labels, instr, dst_wrap_integer(blength));
} else if (dst_checktype(instr, DST_TUPLE)) {
blength++;
} else {
dst_asm_error(&a, "expected assembly instruction");
}
}
/* Allocate bytecode array */
def->bytecode_length = blength;
def->bytecode = malloc(sizeof(int32_t) * blength);
if (NULL == def->bytecode) {
DST_OUT_OF_MEMORY;
}
/* Do bytecode */
for (i = 0; i < count; ++i) {
Dst instr = arr[i];
if (dst_checktype(instr, DST_SYMBOL)) {
continue;
} else {
uint32_t op;
const DstInstructionDef *idef;
const Dst *t;
dst_asm_assert(&a, dst_checktype(instr, DST_TUPLE), "expected tuple");
t = dst_unwrap_tuple(instr);
if (dst_tuple_length(t) == 0) {
op = 0;
} else {
dst_asm_assert(&a, dst_checktype(t[0], DST_SYMBOL),
"expected symbol in assembly instruction");
idef = dst_strbinsearch(
&dst_ops,
sizeof(dst_ops)/sizeof(DstInstructionDef),
sizeof(DstInstructionDef),
dst_unwrap_symbol(t[0]));
if (NULL == idef)
dst_asm_errorv(&a, dst_formatc("unknown instruction %v", instr));
op = read_instruction(&a, idef, t);
}
def->bytecode[a.bytecode_count++] = op;
}
}
} else {
dst_asm_error(&a, "bytecode expected");
}
/* Check for source mapping */
x = dst_get(s, dst_csymbolv("sourcemap"));
if (dst_seq_view(x, &arr, &count)) {
dst_asm_assert(&a, count != 2 * def->bytecode_length, "sourcemap must have twice the length of the bytecode");
def->sourcemap = malloc(sizeof(int32_t) * 2 * count);
for (i = 0; i < count; i += 2) {
Dst start = arr[i];
Dst end = arr[i + 1];
if (!(dst_checktype(start, DST_INTEGER) ||
dst_unwrap_integer(start) < 0)) {
dst_asm_error(&a, "expected positive integer");
}
if (!(dst_checktype(end, DST_INTEGER) ||
dst_unwrap_integer(end) < 0)) {
dst_asm_error(&a, "expected positive integer");
}
def->sourcemap[i] = dst_unwrap_integer(start);
def->sourcemap[i+1] = dst_unwrap_integer(end);
}
}
/* Finish everything and return funcdef */
dst_asm_deinit(&a);
def->environments =
realloc(def->environments, def->environments_length * sizeof(int32_t));
result.funcdef = def;
result.status = DST_ASSEMBLE_OK;
return result;
}
/* Assemble a function */
DstAssembleResult dst_asm(DstAssembleOptions opts) {
return dst_asm1(NULL, opts);
}
/* Build a function from the result */
DstFunction *dst_asm_func(DstAssembleResult result) {
if (result.status != DST_ASSEMBLE_OK) {
return NULL;
}
DstFunction *func = dst_gcalloc(DST_MEMORY_FUNCTION, sizeof(DstFunction));
func->def = result.funcdef;
func->envs = NULL;
return func;
}
/* Disassembly */
/* Find the deinfintion of an instruction given the instruction word. Return
* NULL if not found. */
static const DstInstructionDef *dst_asm_reverse_lookup(uint32_t instr) {
size_t i;
uint32_t opcode = instr & 0xFF;
for (i = 0; i < sizeof(dst_ops)/sizeof(DstInstructionDef); i++) {
const DstInstructionDef *def = dst_ops + i;
if (def->opcode == opcode)
return def;
}
return NULL;
}
/* Create some constant sized tuples */
static Dst tup1(Dst x) {
Dst *tup = dst_tuple_begin(1);
tup[0] = x;
return dst_wrap_tuple(dst_tuple_end(tup));
}
static Dst tup2(Dst x, Dst y) {
Dst *tup = dst_tuple_begin(2);
tup[0] = x;
tup[1] = y;
return dst_wrap_tuple(dst_tuple_end(tup));
}
static Dst tup3(Dst x, Dst y, Dst z) {
Dst *tup = dst_tuple_begin(3);
tup[0] = x;
tup[1] = y;
tup[2] = z;
return dst_wrap_tuple(dst_tuple_end(tup));
}
static Dst tup4(Dst w, Dst x, Dst y, Dst z) {
Dst *tup = dst_tuple_begin(4);
tup[0] = w;
tup[1] = x;
tup[2] = y;
tup[3] = z;
return dst_wrap_tuple(dst_tuple_end(tup));
}
/* Given an argument, convert it to the appriate integer or symbol */
Dst dst_asm_decode_instruction(uint32_t instr) {
const DstInstructionDef *def = dst_asm_reverse_lookup(instr);
Dst name;
if (NULL == def) {
return dst_wrap_integer((int32_t)instr);
}
name = dst_csymbolv(def->name);
#define oparg(shift, mask) ((instr >> ((shift) << 3)) & (mask))
switch (def->type) {
case DIT_0:
return tup1(name);
case DIT_S:
return tup2(name, dst_wrap_integer(oparg(1, 0xFFFFFF)));
case DIT_L:
return tup2(name, dst_wrap_integer((int32_t)instr >> 8));
case DIT_SS:
case DIT_ST:
case DIT_SC:
case DIT_SU:
case DIT_SD:
return tup3(name,
dst_wrap_integer(oparg(1, 0xFF)),
dst_wrap_integer(oparg(2, 0xFFFF)));
case DIT_SI:
case DIT_SL:
return tup3(name,
dst_wrap_integer(oparg(1, 0xFF)),
dst_wrap_integer((int32_t)instr >> 16));
case DIT_SSS:
case DIT_SES:
case DIT_SSU:
return tup4(name,
dst_wrap_integer(oparg(1, 0xFF)),
dst_wrap_integer(oparg(2, 0xFF)),
dst_wrap_integer(oparg(3, 0xFF)));
case DIT_SSI:
return tup4(name,
dst_wrap_integer(oparg(1, 0xFF)),
dst_wrap_integer(oparg(2, 0xFF)),
dst_wrap_integer((int32_t)instr >> 24));
}
#undef oparg
}
Dst dst_disasm(DstFuncDef *def) {
int32_t i;
DstArray *bcode = dst_array(def->bytecode_length);
DstArray *constants;
DstTable *ret = dst_table(10);
if (def->arity)
dst_table_put(ret, dst_csymbolv("arity"), dst_wrap_integer(def->arity));
dst_table_put(ret, dst_csymbolv("bytecode"), dst_wrap_array(bcode));
if (NULL != def->sourcepath) {
dst_table_put(ret, dst_csymbolv("sourcepath"),
dst_wrap_string(def->sourcepath));
}
if (NULL != def->source) {
dst_table_put(ret, dst_csymbolv("source"), dst_wrap_string(def->source));
}
if (def->flags & DST_FUNCDEF_FLAG_VARARG) {
dst_table_put(ret, dst_csymbolv("vararg"), dst_wrap_true());
}
/* Add constants */
if (def->constants_length > 0) {
constants = dst_array(def->constants_length);
dst_table_put(ret, dst_csymbolv("constants"), dst_wrap_array(constants));
for (i = 0; i < def->constants_length; i++) {
Dst src = def->constants[i];
Dst dest;
if (dst_checktype(src, DST_TUPLE)) {
dest = tup2(dst_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] = dst_asm_decode_instruction(def->bytecode[i]);
}
bcode->count = def->bytecode_length;
/* Add source map */
if (NULL != def->sourcemap) {
DstArray *sourcemap = dst_array(def->bytecode_length * 2);
for (i = 0; i < def->bytecode_length * 2; i++) {
sourcemap->data[i] = dst_wrap_integer(def->sourcemap[i]);
}
sourcemap->count = def->bytecode_length * 2;
dst_table_put(ret, dst_csymbolv("sourcemap"), dst_wrap_array(sourcemap));
}
/* Add environments */
if (NULL != def->environments) {
DstArray *envs = dst_array(def->environments_length);
for (i = 0; i < def->environments_length; i++) {
envs->data[i] = dst_wrap_integer(def->environments[i]);
}
envs->count = def->environments_length;
dst_table_put(ret, dst_csymbolv("environments"), dst_wrap_array(envs));
}
/* Add closures */
/* Funcdefs cannot be recursive */
if (NULL != def->defs) {
DstArray *defs = dst_array(def->defs_length);
for (i = 0; i < def->defs_length; i++) {
defs->data[i] = dst_disasm(def->defs[i]);
}
defs->count = def->defs_length;
dst_table_put(ret, dst_csymbolv("defs"), dst_wrap_array(defs));
}
/* Add slotcount */
dst_table_put(ret, dst_csymbolv("slotcount"), dst_wrap_integer(def->slotcount));
return dst_wrap_struct(dst_table_to_struct(ret));
}
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