579 lines
15 KiB
C
579 lines
15 KiB
C
#define i_implement
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#include"vm.h"
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#undef i_implement
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#include"str.h"
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#include<math.h>
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#include<malloc.h>
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size_t lvm_call(LVM *L, LFunc *func, size_t arg_count, set_LValueU *heap, LRegSet *regset) {
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if(func->is_native) {
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return func->native_func(L, func->ud, arg_count, heap, regset);
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}
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static const void *dispatch_table[] = {
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[L_GETGLOBAL] = &&do_getglobal,
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[L_SETGLOBAL] = &&do_setglobal,
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[L_SETINT16] = &&do_setint16,
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[L_SETINT32] = &&do_setint32,
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[L_SETFLOAT] = &&do_setfloat,
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[L_SETSTR] = &&do_setstr,
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[L_SETTABLE] = &&do_settable,
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[L_SETBOOL] = &&do_setbool,
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[L_SETNIL] = &&do_setnil,
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[L_SETFUNC] = &&do_setfunc,
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[L_ADD] = &&do_add,
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[L_SUB] = &&do_sub,
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[L_MUL] = &&do_mul,
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[L_DIV] = &&do_div,
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[L_MOD] = &&do_mod,
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[L_RET] = &&do_ret,
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[L_JNOTCOND] = &&do_jnotcond,
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[L_MOVE] = &&do_move,
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[L_CALL] = &&do_call,
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[L_JUMP] = &&do_jump,
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[L_ADVANCETEST] = &&do_advancetest,
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[L_COND_EQ] = &&do_cond_eq,
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[L_COND_NEQ] = &&do_cond_neq,
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[L_SETFIELD] = &&do_setfield,
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[L_GETFIELD] = &&do_getfield,
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[L_LEN] = &&do_len,
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};
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LUnit *unit = func->unit;
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LInst *inst = func->lua_instrs;
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#define DISPATCH() goto *dispatch_table[(++inst)->opcode]
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LThreadPrivates privates = {.regset = regset, .heap = heap};
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inst--;
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DISPATCH();
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do_getglobal:;
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{
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uint8_t *area = unit->abyss + inst->bc;
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size_t len = *(uint16_t*) area;
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area += 2;
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LString *str = realloc(NULL, sizeof(*str) + len);
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str->length = len;
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memcpy(str->data, area, len);
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regset->regs[inst->a] = ltable_get(func->env, lvalue_from_string(str));
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set_LValueU_insert(heap, lvalue_from_string(str).u);
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lvm_gc_alert(L, &privates, sizeof(*str) + len);
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}
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DISPATCH();
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do_setglobal:;
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{
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uint8_t *area = unit->abyss + inst->bc;
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size_t len = *(uint16_t*) area;
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area += 2;
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LString *str = realloc(NULL, sizeof(*str) + len);
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str->length = len;
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memcpy(str->data, area, len);
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ltable_set(func->env, lvalue_from_string(str), regset->regs[inst->a]);
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set_LValueU_insert(heap, lvalue_from_string(str).u);
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lvm_gc_alert(L, &privates, sizeof(*str) + len);
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}
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DISPATCH();
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do_setint16:;
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regset->regs[inst->a] = lvalue_from_int32((int16_t) inst->bc);
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DISPATCH();
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do_setint32:;
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regset->regs[inst->a] = lvalue_from_int32(*(int32_t*) &unit->abyss[inst->bc]);
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DISPATCH();
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do_setfloat:;
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DISPATCH();
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do_setstr:;
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{
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uint8_t *area = unit->abyss + inst->bc;
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size_t len = *(uint16_t*) area;
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area += 2;
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LString *str = realloc(NULL, sizeof(*str) + len);
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str->length = len;
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memcpy(str->data, area, len);
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regset->regs[inst->a] = lvalue_from_string(str);
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set_LValueU_insert(heap, lvalue_from_string(str).u);
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lvm_gc_alert(L, &privates, sizeof(*str) + len);
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}
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DISPATCH();
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do_settable:;
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{
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LTable *tbl = ltable_new(inst->bc);
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regset->regs[inst->a] = lvalue_from_table(tbl);
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set_LValueU_insert(heap, lvalue_from_table(tbl).u);
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}
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DISPATCH();
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do_setbool:;
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regset->regs[inst->a] = lvalue_from_bool(inst->b);
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DISPATCH();
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do_setnil:;
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regset->regs[inst->a] = lvalue_from_nil();
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DISPATCH();
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do_setfunc:;
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regset->regs[inst->a] = lvalue_from_func(&func->unit->funcs[inst->bc]);
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DISPATCH();
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do_add:;
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{
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LValue x = regset->regs[inst->b];
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LValue y = regset->regs[inst->c];
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if(lvalue_tag(x) == LTAG_I32 && lvalue_tag(y) == LTAG_FLOAT) {
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regset->regs[inst->a] = lvalue_from_double(lvalue_to_int32(x) + y.f);
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} else if(lvalue_tag(x) == LTAG_FLOAT && lvalue_tag(y) == LTAG_I32) {
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regset->regs[inst->a] = lvalue_from_double(x.f + lvalue_to_int32(y));
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} else if(lvalue_tag(x) == LTAG_I32 && lvalue_tag(y) == LTAG_I32) {
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regset->regs[inst->a] = lvalue_from_int32(lvalue_to_int32(x) + lvalue_to_int32(y));
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} else goto err;
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}
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DISPATCH();
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do_sub:;
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{
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LValue x = regset->regs[inst->b];
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LValue y = regset->regs[inst->c];
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if(lvalue_tag(x) == LTAG_I32 && lvalue_tag(y) == LTAG_FLOAT) {
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regset->regs[inst->a] = lvalue_from_double(lvalue_to_int32(x) - y.f);
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} else if(lvalue_tag(x) == LTAG_FLOAT && lvalue_tag(y) == LTAG_I32) {
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regset->regs[inst->a] = lvalue_from_double(x.f - lvalue_to_int32(y));
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} else if(lvalue_tag(x) == LTAG_I32 && lvalue_tag(y) == LTAG_I32) {
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regset->regs[inst->a] = lvalue_from_int32(lvalue_to_int32(x) - lvalue_to_int32(y));
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} else goto err;
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}
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DISPATCH();
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do_mul:;
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{
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LValue x = regset->regs[inst->b];
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LValue y = regset->regs[inst->c];
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if(lvalue_tag(x) == LTAG_I32 && lvalue_tag(y) == LTAG_FLOAT) {
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regset->regs[inst->a] = lvalue_from_double(lvalue_to_int32(x) * y.f);
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} else if(lvalue_tag(x) == LTAG_FLOAT && lvalue_tag(y) == LTAG_I32) {
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regset->regs[inst->a] = lvalue_from_double(x.f * lvalue_to_int32(y));
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} else if(lvalue_tag(x) == LTAG_I32 && lvalue_tag(y) == LTAG_I32) {
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regset->regs[inst->a] = lvalue_from_int32(lvalue_to_int32(x) * lvalue_to_int32(y));
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} else goto err;
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}
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DISPATCH();
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do_div:;
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{
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LValue x = regset->regs[inst->b];
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LValue y = regset->regs[inst->c];
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if(lvalue_tag(x) == LTAG_I32 && lvalue_tag(y) == LTAG_FLOAT) {
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regset->regs[inst->a] = lvalue_from_double(lvalue_to_int32(x) / y.f);
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} else if(lvalue_tag(x) == LTAG_FLOAT && lvalue_tag(y) == LTAG_I32) {
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regset->regs[inst->a] = lvalue_from_double(x.f / lvalue_to_int32(y));
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} else if(lvalue_tag(x) == LTAG_I32 && lvalue_tag(y) == LTAG_I32) {
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int32_t yv = lvalue_to_int32(y);
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if(yv == 0) {
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regset->regs[inst->a] = lvalue_from_nil();
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} else {
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regset->regs[inst->a] = lvalue_from_int32(lvalue_to_int32(x) / yv);
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}
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} else goto err;
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}
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DISPATCH();
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do_mod:;
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{
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LValue x = regset->regs[inst->b];
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LValue y = regset->regs[inst->c];
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if(lvalue_tag(x) == LTAG_I32 && lvalue_tag(y) == LTAG_FLOAT) {
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regset->regs[inst->a] = lvalue_from_double(fmod(fmod(lvalue_to_int32(x), y.f) + y.f, y.f));
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} else if(lvalue_tag(x) == LTAG_FLOAT && lvalue_tag(y) == LTAG_I32) {
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int32_t yv = lvalue_to_int32(y);
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regset->regs[inst->a] = lvalue_from_double(fmod(fmod(x.f, yv) + yv, yv));
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} else if(lvalue_tag(x) == LTAG_I32 && lvalue_tag(y) == LTAG_I32) {
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int32_t yv = lvalue_to_int32(y);
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if(yv == 0) {
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goto err;
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} else {
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regset->regs[inst->a] = lvalue_from_int32((lvalue_to_int32(x) % yv + yv) % yv);
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}
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} else goto err;
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}
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DISPATCH();
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do_jump:;
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inst += (int16_t) inst->bc;
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L->safepoint_func(L, heap, regset);
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DISPATCH();
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do_jnotcond:;
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{
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LValue v = regset->regs[inst->a];
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if(v.u == LTAG_NIL || v.u == LTAG_FALSE) {
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inst += (int16_t) inst->bc;
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}
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}
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DISPATCH();
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do_call:;
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{
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if(lvalue_tag(regset->regs[inst->a]) != LTAG_FUNCTION) {
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goto err;
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}
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uint8_t *abyss_data = unit->abyss + inst->bc;
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uint8_t ret_vreg = abyss_data[0];
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uint8_t arg_count = abyss_data[1];
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uint8_t *args = &abyss_data[2];
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LRegSet regset2 = {.parent = regset};
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lvm_reset_regs(®set2);
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for(int i = 0; i < arg_count; i++) {
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regset2.regs[i] = regset->regs[args[i]];
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}
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size_t returned_count = lvm_call(L, (LFunc*) (regset->regs[inst->a].u & ~LTAG_MASK), arg_count, heap, ®set2);
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if(returned_count) {
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// TODO: more than 1 return
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regset->regs[ret_vreg] = regset2.regs[0];
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}
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}
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DISPATCH();
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do_move:;
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regset->regs[inst->a] = regset->regs[inst->b];
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DISPATCH();
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do_advancetest:;
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{
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int64_t a = lvalue_to_int32(regset->regs[inst->a]);
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int64_t b = lvalue_to_int32(regset->regs[inst->b]);
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int64_t c = lvalue_to_int32(regset->regs[inst->c]);
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if(!((c >= 0 && a > b) || (c < 0 && a < b))) {
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inst++;
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}
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}
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DISPATCH();
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do_cond_eq:;
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regset->regs[inst->a] = lvalue_from_bool(lvalue_eq(regset->regs[inst->b], regset->regs[inst->c]));
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DISPATCH();
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do_cond_neq:;
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regset->regs[inst->a] = lvalue_from_bool(!lvalue_eq(regset->regs[inst->b], regset->regs[inst->c]));
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DISPATCH();
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do_setfield:;
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{
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if(lvalue_tag(regset->regs[inst->a]) != LTAG_TABLE) {
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goto err;
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}
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if(regset->regs[inst->b].u == LTAG_NIL) {
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goto err;
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}
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LTable *tbl = (void*) (regset->regs[inst->a].u & ~LTAG_MASK);
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ltable_set(tbl, regset->regs[inst->b], regset->regs[inst->c]);
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}
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DISPATCH();
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do_getfield:;
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{
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if(lvalue_tag(regset->regs[inst->a]) != LTAG_TABLE) {
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goto err;
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}
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LTable *tbl = (void*) (regset->regs[inst->b].u & ~LTAG_MASK);
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regset->regs[inst->a] = ltable_get(tbl, regset->regs[inst->c]);
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}
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DISPATCH();
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do_len:
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if(lvalue_tag(regset->regs[inst->b]) == LTAG_STRING) {
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regset->regs[inst->a] = lvalue_from_int32(((LString*) (regset->regs[inst->b].u & ~LTAG_MASK))->length);
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} else if(lvalue_tag(regset->regs[inst->b]) == LTAG_TABLE) {
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regset->regs[inst->a] = lvalue_from_int32(ltable_len((LTable*) (regset->regs[inst->b].u & ~LTAG_MASK)));
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} else goto err;
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DISPATCH();
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err:;
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puts("Error");
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do_ret:;
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return 0;
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}
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size_t lvm_run(LVM *L, LFunc *func, size_t arg_count, LRegSet *regset) {
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set_LValueU heap = {};
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atomic_fetch_add(&L->active_thread_count, 1);
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size_t ret = lvm_call(L, func, arg_count, &heap, regset);
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mtx_lock(&L->dead_heap_mut);
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for(c_each(i, set_LValueU, heap)) {
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set_LValueU_insert(&L->dead_heap, *i.ref);
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}
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atomic_fetch_sub(&L->active_thread_count, 1);
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mtx_unlock(&L->dead_heap_mut);
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set_LValueU_drop(&heap);
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return ret;
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}
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LFunc *lvm_func_from_native(LFuncCallback cb, void *ud) {
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LFunc *f = calloc(1, sizeof(*f));
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f->is_native = true;
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f->ud = ud;
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f->native_func = cb;
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return f;
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}
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bool lvalue_eq(LValue a, LValue b) {
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if(a.u == b.u) {
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return true;
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}
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if(lvalue_tag(a) == LTAG_I32 && lvalue_tag(b) == LTAG_FLOAT) {
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return (a.u & ~LTAG_MASK) == b.f;
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} else if(lvalue_tag(a) == LTAG_FLOAT && lvalue_tag(b) == LTAG_I32) {
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return (b.u & ~LTAG_MASK) == a.f;
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} else if(lvalue_tag(a) == LTAG_STRING && lvalue_tag(b) == LTAG_STRING) {
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LString *sa = (LString*) (a.u & ~LTAG_MASK);
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LString *sb = (LString*) (b.u & ~LTAG_MASK);
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if(sa->length != sb->length) {
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return false;
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}
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return !memcmp(sa->data, sb->data, sa->length);
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}
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return false;
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}
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static void gc_unmark_heap(set_LValueU *heap) {
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for(c_each(i, set_LValueU, *heap)) {
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LValue v = (LValue) {.u = *i.ref};
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assert(lvalue_tag(v) == LTAG_TABLE || lvalue_tag(v) == LTAG_STRING);
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void *gco = (void*) (v.u & ~LTAG_MASK);
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if(lvalue_tag(v) == LTAG_TABLE) {
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LTable *tbl = gco;
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tbl->ref = false;
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} else if(lvalue_tag(v) == LTAG_STRING) {
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LString *str = gco;
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str->ref = false;
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}
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}
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}
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static void gc_unmark_all(LVM *L, size_t thread_count) {
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for(size_t thrd = 0; thrd < thread_count; thrd++) {
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LThreadPrivates *privates = &L->privates[thrd];
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gc_unmark_heap(privates->heap);
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}
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gc_unmark_heap(&L->dead_heap);
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}
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static void gc_mark(LValue v) {
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if(lvalue_tag(v) != LTAG_TABLE && lvalue_tag(v) != LTAG_STRING) {
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return;
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}
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void *gco = (void*) (v.u & ~LTAG_MASK);
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if(lvalue_tag(v) == LTAG_TABLE) {
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LTable *tbl = gco;
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tbl->ref = true;
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for(size_t i = 0; i < tbl->buckets->capacity; i++) {
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LTableEntry e = tbl->buckets->data[i];
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gc_mark(e.key);
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gc_mark(e.val);
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}
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} else if(lvalue_tag(v) == LTAG_STRING) {
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LString *str = gco;
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str->ref = true;
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}
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}
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static void gc_mark_units(LVM *L) {
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for(size_t u = 0; u < L->unit_count; u++) {
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LUnit *unit = &L->units[u];
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for(size_t f = 0; f < unit->func_count; f++) {
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LFunc *func = &unit->funcs[f];
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gc_mark(lvalue_from_table(func->env));
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for(size_t upv = 0; upv < func->upvalue_count; upv++) {
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gc_mark(func->upvalues[upv]);
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}
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}
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}
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}
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static void safepoint_active(LVM *L, set_LValueU *heap, LRegSet *regset) {
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size_t my_privates_index = atomic_fetch_add(&L->privates_index, 1);
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L->privates[my_privates_index].heap = heap;
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L->privates[my_privates_index].regset = regset;
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atomic_fetch_add(&L->privates_ready, 1);
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// Wait until GC finishes
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while(atomic_load(&L->safepoint_func) == safepoint_active);
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atomic_fetch_sub(&L->privates_ready, 1);
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}
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static void gc_mark_stacks(LVM *L, size_t thread_count) {
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for(size_t thrd = 0; thrd < thread_count; thrd++) {
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LThreadPrivates *privates = &L->privates[thrd];
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LRegSet *rset = privates->regset;
|
|
while(rset) {
|
|
for(size_t r = 0; r < 256; r++) {
|
|
gc_mark(rset->regs[r]);
|
|
}
|
|
rset = rset->parent;
|
|
}
|
|
}
|
|
}
|
|
static void safepoint_inactive(LVM *L, set_LValueU *heap, LRegSet *regset) {
|
|
}
|
|
static void gc_delete_unmarked_in_heap(LVM *L, set_LValueU *heap) {
|
|
for(set_LValueU_iter i = set_LValueU_begin(heap); i.ref;) {
|
|
LValue v = (LValue) {.u = *i.ref};
|
|
|
|
void *gco = (void*) (v.u & ~LTAG_MASK);
|
|
|
|
if(lvalue_tag(v) == LTAG_TABLE) {
|
|
LTable *tbl = gco;
|
|
|
|
if(tbl->ref == false) {
|
|
free(tbl->buckets);
|
|
free(tbl);
|
|
|
|
i = set_LValueU_erase_at(heap, i);
|
|
continue;
|
|
}
|
|
} else if(lvalue_tag(v) == LTAG_STRING) {
|
|
LString *str = gco;
|
|
|
|
if(str->ref == false) {
|
|
lvm_gc_alert(L, NULL, -sizeof(*str) - str->length);
|
|
|
|
free(str);
|
|
|
|
i = set_LValueU_erase_at(heap, i);
|
|
continue;
|
|
}
|
|
}
|
|
|
|
set_LValueU_next(&i);
|
|
}
|
|
}
|
|
static void gc_delete_unmarked(LVM *L, size_t thread_count) {
|
|
for(size_t thrd = 0; thrd < thread_count; thrd++) {
|
|
LThreadPrivates *privates = &L->privates[thrd];
|
|
gc_delete_unmarked_in_heap(L, privates->heap);
|
|
}
|
|
gc_delete_unmarked_in_heap(L, &L->dead_heap);
|
|
}
|
|
static void lvm_gc_force(LVM *L, LThreadPrivates *callerPrivates) {
|
|
// At most one thread can force GC, while others must behave as usual and enter a safepoint instead
|
|
if(atomic_compare_exchange_strong(&L->gcInProgress, &(bool) {false}, true)) {
|
|
|
|
//static size_t gcidx = 0;
|
|
//fprintf(stderr, "GC %i (%lu bytes)\n", atomic_fetch_add(&gcidx, 1), L->memUsage);
|
|
|
|
if(callerPrivates) {
|
|
// Called from within VM
|
|
atomic_store(&L->privates_index, 1);
|
|
atomic_store(&L->privates_ready, 1);
|
|
|
|
L->privates[0] = *callerPrivates;
|
|
} else {
|
|
// Called outside of VM, probably by lvm_destroy
|
|
atomic_store(&L->privates_index, 0);
|
|
atomic_store(&L->privates_ready, 0);
|
|
}
|
|
|
|
L->safepoint_func = safepoint_active;
|
|
|
|
// Wait until other threads have entered GC stage
|
|
while(atomic_load(&L->privates_ready) < atomic_load(&L->active_thread_count));
|
|
|
|
size_t thread_count = atomic_load(&L->privates_ready);
|
|
|
|
mtx_lock(&L->dead_heap_mut);
|
|
gc_unmark_all(L, thread_count);
|
|
gc_mark_stacks(L, thread_count);
|
|
gc_mark_units(L);
|
|
gc_delete_unmarked(L, thread_count);
|
|
mtx_unlock(&L->dead_heap_mut);
|
|
|
|
while(L->memUsage > L->nextGCThreshold) {
|
|
L->nextGCThreshold <<= 1;
|
|
}
|
|
|
|
L->safepoint_func = safepoint_inactive;
|
|
|
|
if(callerPrivates) {
|
|
// Called from within VM
|
|
atomic_fetch_sub(&L->privates_ready, 1);
|
|
}
|
|
|
|
// Wait until other threads have left GC stage
|
|
while(atomic_load(&L->privates_ready) > 0);
|
|
|
|
atomic_store(&L->gcInProgress, false);
|
|
|
|
}
|
|
}
|
|
|
|
// `privates` can be NULL but ONLY IF diff < 0
|
|
void lvm_gc_alert(LVM *L, LThreadPrivates *privates, intmax_t diff) {
|
|
L->memUsage += diff;
|
|
|
|
assert(L->memUsage >= 0);
|
|
|
|
if(L->memUsage > L->nextGCThreshold) {
|
|
lvm_gc_force(L, privates);
|
|
}
|
|
}
|
|
|
|
void lvm_init(LVM *L) {
|
|
memset(L, 0, sizeof(*L));
|
|
|
|
L->safepoint_func = safepoint_inactive;
|
|
L->nextGCThreshold = 16384;
|
|
mtx_init(&L->dead_heap_mut, mtx_plain);
|
|
}
|
|
|
|
void lvm_destroy(LVM *L) {
|
|
mtx_destroy(&L->dead_heap_mut);
|
|
|
|
lvm_gc_force(L, NULL);
|
|
|
|
set_LValueU_drop(&L->dead_heap);
|
|
}
|