/* * Copyright (c) 2023 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 #include "state.h" #include "fiber.h" #include "gc.h" #include "symcache.h" #include "util.h" #endif #include /* Virtual registers * * One instruction word * CC | BB | AA | OP * DD | DD | DD | OP * EE | EE | AA | OP */ #define A ((*pc >> 8) & 0xFF) #define B ((*pc >> 16) & 0xFF) #define C (*pc >> 24) #define D (*pc >> 8) #define E (*pc >> 16) /* Signed interpretations of registers */ #define CS (*((int32_t *)pc) >> 24) #define DS (*((int32_t *)pc) >> 8) #define ES (*((int32_t *)pc) >> 16) /* How we dispatch instructions. By default, we use * a switch inside an infinite loop. For GCC/clang, we use * computed gotos. */ #if defined(__GNUC__) && !defined(__EMSCRIPTEN__) #define JANET_USE_COMPUTED_GOTOS #endif #ifdef JANET_USE_COMPUTED_GOTOS #define VM_START() { goto *op_lookup[first_opcode]; #define VM_END() } #define VM_OP(op) label_##op : #define VM_DEFAULT() label_unknown_op: #define vm_next() goto *op_lookup[*pc & 0xFF] #define opcode (*pc & 0xFF) #else #define VM_START() uint8_t opcode = first_opcode; for (;;) {switch(opcode) { #define VM_END() }} #define VM_OP(op) case op : #define VM_DEFAULT() default: #define vm_next() opcode = *pc & 0xFF; continue #endif /* Commit and restore VM state before possible longjmp */ #define vm_commit() do { janet_stack_frame(stack)->pc = pc; } while (0) #define vm_restore() do { \ stack = fiber->data + fiber->frame; \ pc = janet_stack_frame(stack)->pc; \ func = janet_stack_frame(stack)->func; \ } while (0) #define vm_return(sig, val) do { \ janet_vm.return_reg[0] = (val); \ vm_commit(); \ return (sig); \ } while (0) #define vm_return_no_restore(sig, val) do { \ janet_vm.return_reg[0] = (val); \ return (sig); \ } while (0) /* Next instruction variations */ #define maybe_collect() do {\ if (janet_vm.next_collection >= janet_vm.gc_interval) janet_collect(); } while (0) #define vm_checkgc_next() maybe_collect(); vm_next() #define vm_pcnext() pc++; vm_next() #define vm_checkgc_pcnext() maybe_collect(); vm_pcnext() /* Handle certain errors in main vm loop */ #define vm_throw(e) do { vm_commit(); janet_panic(e); } while (0) #define vm_assert(cond, e) do {if (!(cond)) vm_throw((e)); } while (0) #define vm_assert_type(X, T) do { \ if (!(janet_checktype((X), (T)))) { \ vm_commit(); \ janet_panicf("expected %T, got %v", (1 << (T)), (X)); \ } \ } while (0) #define vm_assert_types(X, TS) do { \ if (!(janet_checktypes((X), (TS)))) { \ vm_commit(); \ janet_panicf("expected %T, got %v", (TS), (X)); \ } \ } while (0) #ifdef JANET_NO_INTERPRETER_INTERRUPT #define vm_maybe_auto_suspend(COND) #else #define vm_maybe_auto_suspend(COND) do { \ if ((COND) && janet_vm.auto_suspend) { \ janet_vm.auto_suspend = 0; \ fiber->flags |= (JANET_FIBER_RESUME_NO_USEVAL | JANET_FIBER_RESUME_NO_SKIP); \ vm_return(JANET_SIGNAL_INTERRUPT, janet_wrap_nil()); \ } \ } while (0) #endif /* Templates for certain patterns in opcodes */ #define vm_binop_immediate(op)\ {\ Janet op1 = stack[B];\ if (!janet_checktype(op1, JANET_NUMBER)) {\ vm_commit();\ Janet _argv[2] = { op1, janet_wrap_number(CS) };\ stack[A] = janet_mcall(#op, 2, _argv);\ vm_checkgc_pcnext();\ } else {\ double x1 = janet_unwrap_number(op1);\ stack[A] = janet_wrap_number(x1 op CS);\ vm_pcnext();\ }\ } #define _vm_bitop_immediate(op, type1)\ {\ Janet op1 = stack[B];\ if (!janet_checktype(op1, JANET_NUMBER)) {\ vm_commit();\ Janet _argv[2] = { op1, janet_wrap_number(CS) };\ stack[A] = janet_mcall(#op, 2, _argv);\ vm_checkgc_pcnext();\ } else {\ type1 x1 = (type1) janet_unwrap_integer(op1);\ stack[A] = janet_wrap_integer(x1 op CS);\ vm_pcnext();\ }\ } #define vm_bitop_immediate(op) _vm_bitop_immediate(op, int32_t); #define vm_bitopu_immediate(op) _vm_bitop_immediate(op, uint32_t); #define _vm_binop(op, wrap)\ {\ Janet op1 = stack[B];\ Janet op2 = stack[C];\ if (janet_checktype(op1, JANET_NUMBER) && janet_checktype(op2, JANET_NUMBER)) {\ double x1 = janet_unwrap_number(op1);\ double x2 = janet_unwrap_number(op2);\ stack[A] = wrap(x1 op x2);\ vm_pcnext();\ } else {\ vm_commit();\ stack[A] = janet_binop_call(#op, "r" #op, op1, op2);\ vm_checkgc_pcnext();\ }\ } #define vm_binop(op) _vm_binop(op, janet_wrap_number) #define _vm_bitop(op, type1)\ {\ Janet op1 = stack[B];\ Janet op2 = stack[C];\ if (janet_checktype(op1, JANET_NUMBER) && janet_checktype(op2, JANET_NUMBER)) {\ type1 x1 = (type1) janet_unwrap_integer(op1);\ int32_t x2 = janet_unwrap_integer(op2);\ stack[A] = janet_wrap_integer(x1 op x2);\ vm_pcnext();\ } else {\ vm_commit();\ stack[A] = janet_binop_call(#op, "r" #op, op1, op2);\ vm_checkgc_pcnext();\ }\ } #define vm_bitop(op) _vm_bitop(op, int32_t) #define vm_bitopu(op) _vm_bitop(op, uint32_t) #define vm_compop(op) \ {\ Janet op1 = stack[B];\ Janet op2 = stack[C];\ if (janet_checktype(op1, JANET_NUMBER) && janet_checktype(op2, JANET_NUMBER)) {\ double x1 = janet_unwrap_number(op1);\ double x2 = janet_unwrap_number(op2);\ stack[A] = janet_wrap_boolean(x1 op x2);\ vm_pcnext();\ } else {\ vm_commit();\ stack[A] = janet_wrap_boolean(janet_compare(op1, op2) op 0);\ vm_checkgc_pcnext();\ }\ } #define vm_compop_imm(op) \ {\ Janet op1 = stack[B];\ if (janet_checktype(op1, JANET_NUMBER)) {\ double x1 = janet_unwrap_number(op1);\ double x2 = (double) CS; \ stack[A] = janet_wrap_boolean(x1 op x2);\ vm_pcnext();\ } else {\ vm_commit();\ stack[A] = janet_wrap_boolean(janet_compare(op1, janet_wrap_integer(CS)) op 0);\ vm_checkgc_pcnext();\ }\ } /* Trace a function call */ static void vm_do_trace(JanetFunction *func, int32_t argc, const Janet *argv) { if (func->def->name) { janet_eprintf("trace (%S", func->def->name); } else { janet_eprintf("trace (%p", janet_wrap_function(func)); } for (int32_t i = 0; i < argc; i++) { janet_eprintf(" %p", argv[i]); } janet_eprintf(")\n"); } /* Invoke a method once we have looked it up */ static Janet janet_method_invoke(Janet method, int32_t argc, Janet *argv) { switch (janet_type(method)) { case JANET_CFUNCTION: return (janet_unwrap_cfunction(method))(argc, argv); case JANET_FUNCTION: { JanetFunction *fun = janet_unwrap_function(method); return janet_call(fun, argc, argv); } case JANET_ABSTRACT: { JanetAbstract abst = janet_unwrap_abstract(method); const JanetAbstractType *at = janet_abstract_type(abst); if (NULL != at->call) { return at->call(abst, argc, argv); } } /* fallthrough */ case JANET_STRING: case JANET_BUFFER: case JANET_TABLE: case JANET_STRUCT: case JANET_ARRAY: case JANET_TUPLE: { if (argc != 1) { janet_panicf("%v called with %d arguments, possibly expected 1", method, argc); } return janet_in(method, argv[0]); } default: { if (argc != 1) { janet_panicf("%v called with %d arguments, possibly expected 1", method, argc); } return janet_in(argv[0], method); } } } /* Call a non function type from a JOP_CALL or JOP_TAILCALL instruction. * Assumes that the arguments are on the fiber stack. */ static Janet call_nonfn(JanetFiber *fiber, Janet callee) { int32_t argc = fiber->stacktop - fiber->stackstart; fiber->stacktop = fiber->stackstart; return janet_method_invoke(callee, argc, fiber->data + fiber->stacktop); } /* Method lookup could potentially handle tables specially... */ static Janet method_to_fun(Janet method, Janet obj) { return janet_get(obj, method); } /* Get a callable from a keyword method name and ensure that it is valid. */ static Janet resolve_method(Janet name, JanetFiber *fiber) { int32_t argc = fiber->stacktop - fiber->stackstart; if (argc < 1) janet_panicf("method call (%v) takes at least 1 argument, got 0", name); Janet callee = method_to_fun(name, fiber->data[fiber->stackstart]); if (janet_checktype(callee, JANET_NIL)) janet_panicf("unknown method %v invoked on %v", name, fiber->data[fiber->stackstart]); return callee; } /* Lookup method on value x */ static Janet janet_method_lookup(Janet x, const char *name) { return method_to_fun(janet_ckeywordv(name), x); } /* Call a method first on the righthand side, and then on the left hand side with a prefix */ static Janet janet_binop_call(const char *lmethod, const char *rmethod, Janet lhs, Janet rhs) { Janet lm = janet_method_lookup(lhs, lmethod); if (janet_checktype(lm, JANET_NIL)) { /* Invert order for rmethod */ Janet lr = janet_method_lookup(rhs, rmethod); Janet argv[2] = { rhs, lhs }; if (janet_checktype(lr, JANET_NIL)) { janet_panicf("could not find method :%s for %v, or :%s for %v", lmethod, lhs, rmethod, rhs); } return janet_method_invoke(lr, 2, argv); } else { Janet argv[2] = { lhs, rhs }; return janet_method_invoke(lm, 2, argv); } } /* Forward declaration */ static JanetSignal janet_check_can_resume(JanetFiber *fiber, Janet *out, int is_cancel); static JanetSignal janet_continue_no_check(JanetFiber *fiber, Janet in, Janet *out); /* Interpreter main loop */ static JanetSignal run_vm(JanetFiber *fiber, Janet in) { /* opcode -> label lookup if using clang/GCC */ #ifdef JANET_USE_COMPUTED_GOTOS static void *op_lookup[255] = { &&label_JOP_NOOP, &&label_JOP_ERROR, &&label_JOP_TYPECHECK, &&label_JOP_RETURN, &&label_JOP_RETURN_NIL, &&label_JOP_ADD_IMMEDIATE, &&label_JOP_ADD, &&label_JOP_SUBTRACT, &&label_JOP_MULTIPLY_IMMEDIATE, &&label_JOP_MULTIPLY, &&label_JOP_DIVIDE_IMMEDIATE, &&label_JOP_DIVIDE, &&label_JOP_MODULO, &&label_JOP_REMAINDER, &&label_JOP_BAND, &&label_JOP_BOR, &&label_JOP_BXOR, &&label_JOP_BNOT, &&label_JOP_SHIFT_LEFT, &&label_JOP_SHIFT_LEFT_IMMEDIATE, &&label_JOP_SHIFT_RIGHT, &&label_JOP_SHIFT_RIGHT_IMMEDIATE, &&label_JOP_SHIFT_RIGHT_UNSIGNED, &&label_JOP_SHIFT_RIGHT_UNSIGNED_IMMEDIATE, &&label_JOP_MOVE_FAR, &&label_JOP_MOVE_NEAR, &&label_JOP_JUMP, &&label_JOP_JUMP_IF, &&label_JOP_JUMP_IF_NOT, &&label_JOP_JUMP_IF_NIL, &&label_JOP_JUMP_IF_NOT_NIL, &&label_JOP_GREATER_THAN, &&label_JOP_GREATER_THAN_IMMEDIATE, &&label_JOP_LESS_THAN, &&label_JOP_LESS_THAN_IMMEDIATE, &&label_JOP_EQUALS, &&label_JOP_EQUALS_IMMEDIATE, &&label_JOP_COMPARE, &&label_JOP_LOAD_NIL, &&label_JOP_LOAD_TRUE, &&label_JOP_LOAD_FALSE, &&label_JOP_LOAD_INTEGER, &&label_JOP_LOAD_CONSTANT, &&label_JOP_LOAD_UPVALUE, &&label_JOP_LOAD_SELF, &&label_JOP_SET_UPVALUE, &&label_JOP_CLOSURE, &&label_JOP_PUSH, &&label_JOP_PUSH_2, &&label_JOP_PUSH_3, &&label_JOP_PUSH_ARRAY, &&label_JOP_CALL, &&label_JOP_TAILCALL, &&label_JOP_RESUME, &&label_JOP_SIGNAL, &&label_JOP_PROPAGATE, &&label_JOP_IN, &&label_JOP_GET, &&label_JOP_PUT, &&label_JOP_GET_INDEX, &&label_JOP_PUT_INDEX, &&label_JOP_LENGTH, &&label_JOP_MAKE_ARRAY, &&label_JOP_MAKE_BUFFER, &&label_JOP_MAKE_STRING, &&label_JOP_MAKE_STRUCT, &&label_JOP_MAKE_TABLE, &&label_JOP_MAKE_TUPLE, &&label_JOP_MAKE_BRACKET_TUPLE, &&label_JOP_GREATER_THAN_EQUAL, &&label_JOP_LESS_THAN_EQUAL, &&label_JOP_NEXT, &&label_JOP_NOT_EQUALS, &&label_JOP_NOT_EQUALS_IMMEDIATE, &&label_JOP_CANCEL, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op, &&label_unknown_op }; #endif /* Interpreter state */ register Janet *stack; register uint32_t *pc; register JanetFunction *func; if (fiber->flags & JANET_FIBER_RESUME_SIGNAL) { JanetSignal sig = (fiber->gc.flags & JANET_FIBER_STATUS_MASK) >> JANET_FIBER_STATUS_OFFSET; fiber->gc.flags &= ~JANET_FIBER_STATUS_MASK; fiber->flags &= ~(JANET_FIBER_RESUME_SIGNAL | JANET_FIBER_FLAG_MASK); janet_vm.return_reg[0] = in; return sig; } vm_restore(); if (fiber->flags & JANET_FIBER_DID_LONGJUMP) { if (janet_fiber_frame(fiber)->func == NULL) { /* Inside a c function */ janet_fiber_popframe(fiber); vm_restore(); } /* Check if we were at a tail call instruction. If so, do implicit return */ if ((*pc & 0xFF) == JOP_TAILCALL) { /* Tail call resume */ int entrance_frame = janet_stack_frame(stack)->flags & JANET_STACKFRAME_ENTRANCE; janet_fiber_popframe(fiber); if (entrance_frame) { fiber->flags &= ~JANET_FIBER_FLAG_MASK; vm_return(JANET_SIGNAL_OK, in); } vm_restore(); } } if (!(fiber->flags & JANET_FIBER_RESUME_NO_USEVAL)) stack[A] = in; if (!(fiber->flags & JANET_FIBER_RESUME_NO_SKIP)) pc++; uint8_t first_opcode = *pc & ((fiber->flags & JANET_FIBER_BREAKPOINT) ? 0x7F : 0xFF); fiber->flags &= ~JANET_FIBER_FLAG_MASK; /* Main interpreter loop. Semantically is a switch on * (*pc & 0xFF) inside of an infinite loop. */ VM_START(); VM_DEFAULT(); fiber->flags |= JANET_FIBER_BREAKPOINT | JANET_FIBER_RESUME_NO_USEVAL | JANET_FIBER_RESUME_NO_SKIP; vm_return(JANET_SIGNAL_DEBUG, janet_wrap_nil()); VM_OP(JOP_NOOP) vm_pcnext(); VM_OP(JOP_ERROR) vm_return(JANET_SIGNAL_ERROR, stack[A]); VM_OP(JOP_TYPECHECK) vm_assert_types(stack[A], E); vm_pcnext(); VM_OP(JOP_RETURN) { Janet retval = stack[D]; int entrance_frame = janet_stack_frame(stack)->flags & JANET_STACKFRAME_ENTRANCE; janet_fiber_popframe(fiber); if (entrance_frame) vm_return_no_restore(JANET_SIGNAL_OK, retval); vm_restore(); stack[A] = retval; vm_checkgc_pcnext(); } VM_OP(JOP_RETURN_NIL) { Janet retval = janet_wrap_nil(); int entrance_frame = janet_stack_frame(stack)->flags & JANET_STACKFRAME_ENTRANCE; janet_fiber_popframe(fiber); if (entrance_frame) vm_return_no_restore(JANET_SIGNAL_OK, retval); vm_restore(); stack[A] = retval; vm_checkgc_pcnext(); } VM_OP(JOP_ADD_IMMEDIATE) vm_binop_immediate(+); VM_OP(JOP_ADD) vm_binop(+); VM_OP(JOP_SUBTRACT) vm_binop(-); VM_OP(JOP_MULTIPLY_IMMEDIATE) vm_binop_immediate(*); VM_OP(JOP_MULTIPLY) vm_binop(*); VM_OP(JOP_DIVIDE_IMMEDIATE) vm_binop_immediate( /); VM_OP(JOP_DIVIDE) vm_binop( /); VM_OP(JOP_MODULO) { Janet op1 = stack[B]; Janet op2 = stack[C]; if (janet_checktype(op1, JANET_NUMBER) && janet_checktype(op2, JANET_NUMBER)) { double x1 = janet_unwrap_number(op1); double x2 = janet_unwrap_number(op2); double intres = x2 * floor(x1 / x2); stack[A] = janet_wrap_number(x1 - intres); vm_pcnext(); } else { vm_commit(); stack[A] = janet_binop_call("mod", "rmod", op1, op2); vm_checkgc_pcnext(); } } VM_OP(JOP_REMAINDER) { Janet op1 = stack[B]; Janet op2 = stack[C]; if (janet_checktype(op1, JANET_NUMBER) && janet_checktype(op2, JANET_NUMBER)) { double x1 = janet_unwrap_number(op1); double x2 = janet_unwrap_number(op2); stack[A] = janet_wrap_number(fmod(x1, x2)); vm_pcnext(); } else { vm_commit(); stack[A] = janet_binop_call("%", "r%", op1, op2); vm_checkgc_pcnext(); } } VM_OP(JOP_BAND) vm_bitop(&); VM_OP(JOP_BOR) vm_bitop( |); VM_OP(JOP_BXOR) vm_bitop(^); VM_OP(JOP_BNOT) { Janet op = stack[E]; vm_assert_type(op, JANET_NUMBER); stack[A] = janet_wrap_integer(~janet_unwrap_integer(op)); vm_pcnext(); } VM_OP(JOP_SHIFT_RIGHT_UNSIGNED) vm_bitopu( >>); VM_OP(JOP_SHIFT_RIGHT_UNSIGNED_IMMEDIATE) vm_bitopu_immediate( >>); VM_OP(JOP_SHIFT_RIGHT) vm_bitop( >>); VM_OP(JOP_SHIFT_RIGHT_IMMEDIATE) vm_bitop_immediate( >>); VM_OP(JOP_SHIFT_LEFT) vm_bitop( <<); VM_OP(JOP_SHIFT_LEFT_IMMEDIATE) vm_bitop_immediate( <<); VM_OP(JOP_MOVE_NEAR) stack[A] = stack[E]; vm_pcnext(); VM_OP(JOP_MOVE_FAR) stack[E] = stack[A]; vm_pcnext(); VM_OP(JOP_JUMP) pc += DS; vm_maybe_auto_suspend(DS < 0); vm_next(); VM_OP(JOP_JUMP_IF) if (janet_truthy(stack[A])) { pc += ES; vm_maybe_auto_suspend(ES < 0); } else { pc++; } vm_next(); VM_OP(JOP_JUMP_IF_NOT) if (janet_truthy(stack[A])) { pc++; } else { pc += ES; vm_maybe_auto_suspend(ES < 0); } vm_next(); VM_OP(JOP_JUMP_IF_NIL) if (janet_checktype(stack[A], JANET_NIL)) { pc += ES; vm_maybe_auto_suspend(ES < 0); } else { pc++; } vm_next(); VM_OP(JOP_JUMP_IF_NOT_NIL) if (janet_checktype(stack[A], JANET_NIL)) { pc++; } else { pc += ES; vm_maybe_auto_suspend(ES < 0); } vm_next(); VM_OP(JOP_LESS_THAN) vm_compop( <); VM_OP(JOP_LESS_THAN_EQUAL) vm_compop( <=); VM_OP(JOP_LESS_THAN_IMMEDIATE) vm_compop_imm( <); VM_OP(JOP_GREATER_THAN) vm_compop( >); VM_OP(JOP_GREATER_THAN_EQUAL) vm_compop( >=); VM_OP(JOP_GREATER_THAN_IMMEDIATE) vm_compop_imm( >); VM_OP(JOP_EQUALS) stack[A] = janet_wrap_boolean(janet_equals(stack[B], stack[C])); vm_pcnext(); VM_OP(JOP_EQUALS_IMMEDIATE) stack[A] = janet_wrap_boolean(janet_unwrap_number(stack[B]) == (double) CS); vm_pcnext(); VM_OP(JOP_NOT_EQUALS) stack[A] = janet_wrap_boolean(!janet_equals(stack[B], stack[C])); vm_pcnext(); VM_OP(JOP_NOT_EQUALS_IMMEDIATE) stack[A] = janet_wrap_boolean(janet_unwrap_number(stack[B]) != (double) CS); vm_pcnext(); VM_OP(JOP_COMPARE) stack[A] = janet_wrap_integer(janet_compare(stack[B], stack[C])); vm_pcnext(); VM_OP(JOP_NEXT) vm_commit(); { Janet temp = janet_next_impl(stack[B], stack[C], 1); vm_restore(); stack[A] = temp; } vm_pcnext(); VM_OP(JOP_LOAD_NIL) stack[D] = janet_wrap_nil(); vm_pcnext(); VM_OP(JOP_LOAD_TRUE) stack[D] = janet_wrap_true(); vm_pcnext(); VM_OP(JOP_LOAD_FALSE) stack[D] = janet_wrap_false(); vm_pcnext(); VM_OP(JOP_LOAD_INTEGER) stack[A] = janet_wrap_integer(ES); vm_pcnext(); VM_OP(JOP_LOAD_CONSTANT) { int32_t cindex = (int32_t)E; vm_assert(cindex < func->def->constants_length, "invalid constant"); stack[A] = func->def->constants[cindex]; vm_pcnext(); } VM_OP(JOP_LOAD_SELF) stack[D] = janet_wrap_function(func); vm_pcnext(); VM_OP(JOP_LOAD_UPVALUE) { int32_t eindex = B; int32_t vindex = C; JanetFuncEnv *env; vm_assert(func->def->environments_length > eindex, "invalid upvalue environment"); env = func->envs[eindex]; vm_assert(env->length > vindex, "invalid upvalue index"); vm_assert(janet_env_valid(env), "invalid upvalue environment"); if (env->offset > 0) { /* On stack */ stack[A] = env->as.fiber->data[env->offset + vindex]; } else { /* Off stack */ stack[A] = env->as.values[vindex]; } vm_pcnext(); } VM_OP(JOP_SET_UPVALUE) { int32_t eindex = B; int32_t vindex = C; JanetFuncEnv *env; vm_assert(func->def->environments_length > eindex, "invalid upvalue environment"); env = func->envs[eindex]; vm_assert(env->length > vindex, "invalid upvalue index"); vm_assert(janet_env_valid(env), "invalid upvalue environment"); if (env->offset > 0) { env->as.fiber->data[env->offset + vindex] = stack[A]; } else { env->as.values[vindex] = stack[A]; } vm_pcnext(); } VM_OP(JOP_CLOSURE) { JanetFuncDef *fd; JanetFunction *fn; int32_t elen; int32_t defindex = (int32_t)E; vm_assert(defindex < func->def->defs_length, "invalid funcdef"); fd = func->def->defs[defindex]; elen = fd->environments_length; fn = janet_gcalloc(JANET_MEMORY_FUNCTION, sizeof(JanetFunction) + ((size_t) elen * sizeof(JanetFuncEnv *))); fn->def = fd; { int32_t i; for (i = 0; i < elen; ++i) { int32_t inherit = fd->environments[i]; if (inherit == -1 || inherit >= func->def->environments_length) { JanetStackFrame *frame = janet_stack_frame(stack); if (!frame->env) { /* Lazy capture of current stack frame */ JanetFuncEnv *env = janet_gcalloc(JANET_MEMORY_FUNCENV, sizeof(JanetFuncEnv)); env->offset = fiber->frame; env->as.fiber = fiber; env->length = func->def->slotcount; frame->env = env; } fn->envs[i] = frame->env; } else { fn->envs[i] = func->envs[inherit]; } } } stack[A] = janet_wrap_function(fn); vm_checkgc_pcnext(); } VM_OP(JOP_PUSH) janet_fiber_push(fiber, stack[D]); stack = fiber->data + fiber->frame; vm_checkgc_pcnext(); VM_OP(JOP_PUSH_2) janet_fiber_push2(fiber, stack[A], stack[E]); stack = fiber->data + fiber->frame; vm_checkgc_pcnext(); VM_OP(JOP_PUSH_3) janet_fiber_push3(fiber, stack[A], stack[B], stack[C]); stack = fiber->data + fiber->frame; vm_checkgc_pcnext(); VM_OP(JOP_PUSH_ARRAY) { const Janet *vals; int32_t len; if (janet_indexed_view(stack[D], &vals, &len)) { janet_fiber_pushn(fiber, vals, len); } else { janet_panicf("expected %T, got %v", JANET_TFLAG_INDEXED, stack[D]); } } stack = fiber->data + fiber->frame; vm_checkgc_pcnext(); VM_OP(JOP_CALL) { vm_maybe_auto_suspend(1); Janet callee = stack[E]; if (fiber->stacktop > fiber->maxstack) { vm_throw("stack overflow"); } if (janet_checktype(callee, JANET_KEYWORD)) { vm_commit(); callee = resolve_method(callee, fiber); } if (janet_checktype(callee, JANET_FUNCTION)) { func = janet_unwrap_function(callee); if (func->gc.flags & JANET_FUNCFLAG_TRACE) { vm_do_trace(func, fiber->stacktop - fiber->stackstart, fiber->data + fiber->stackstart); } janet_stack_frame(stack)->pc = pc; if (janet_fiber_funcframe(fiber, func)) { int32_t n = fiber->stacktop - fiber->stackstart; janet_panicf("%v called with %d argument%s, expected %d", callee, n, n == 1 ? "" : "s", func->def->arity); } stack = fiber->data + fiber->frame; pc = func->def->bytecode; vm_checkgc_next(); } else if (janet_checktype(callee, JANET_CFUNCTION)) { vm_commit(); int32_t argc = fiber->stacktop - fiber->stackstart; janet_fiber_cframe(fiber, janet_unwrap_cfunction(callee)); Janet ret = janet_unwrap_cfunction(callee)(argc, fiber->data + fiber->frame); janet_fiber_popframe(fiber); stack = fiber->data + fiber->frame; stack[A] = ret; vm_checkgc_pcnext(); } else { vm_commit(); stack[A] = call_nonfn(fiber, callee); vm_pcnext(); } } VM_OP(JOP_TAILCALL) { vm_maybe_auto_suspend(1); Janet callee = stack[D]; if (fiber->stacktop > fiber->maxstack) { vm_throw("stack overflow"); } if (janet_checktype(callee, JANET_KEYWORD)) { vm_commit(); callee = resolve_method(callee, fiber); } if (janet_checktype(callee, JANET_FUNCTION)) { func = janet_unwrap_function(callee); if (func->gc.flags & JANET_FUNCFLAG_TRACE) { vm_do_trace(func, fiber->stacktop - fiber->stackstart, fiber->data + fiber->stackstart); } if (janet_fiber_funcframe_tail(fiber, func)) { janet_stack_frame(fiber->data + fiber->frame)->pc = pc; int32_t n = fiber->stacktop - fiber->stackstart; janet_panicf("%v called with %d argument%s, expected %d", callee, n, n == 1 ? "" : "s", func->def->arity); } stack = fiber->data + fiber->frame; pc = func->def->bytecode; vm_checkgc_next(); } else { Janet retreg; int entrance_frame = janet_stack_frame(stack)->flags & JANET_STACKFRAME_ENTRANCE; vm_commit(); if (janet_checktype(callee, JANET_CFUNCTION)) { int32_t argc = fiber->stacktop - fiber->stackstart; janet_fiber_cframe(fiber, janet_unwrap_cfunction(callee)); retreg = janet_unwrap_cfunction(callee)(argc, fiber->data + fiber->frame); janet_fiber_popframe(fiber); } else { retreg = call_nonfn(fiber, callee); } janet_fiber_popframe(fiber); if (entrance_frame) { vm_return_no_restore(JANET_SIGNAL_OK, retreg); } vm_restore(); stack[A] = retreg; vm_checkgc_pcnext(); } } VM_OP(JOP_RESUME) { Janet retreg; vm_maybe_auto_suspend(1); vm_assert_type(stack[B], JANET_FIBER); JanetFiber *child = janet_unwrap_fiber(stack[B]); if (janet_check_can_resume(child, &retreg, 0)) { vm_commit(); janet_panicv(retreg); } fiber->child = child; JanetSignal sig = janet_continue_no_check(child, stack[C], &retreg); if (sig != JANET_SIGNAL_OK && !(child->flags & (1 << sig))) { vm_return(sig, retreg); } fiber->child = NULL; stack = fiber->data + fiber->frame; stack[A] = retreg; vm_checkgc_pcnext(); } VM_OP(JOP_SIGNAL) { int32_t s = C; if (s > JANET_SIGNAL_USER9) s = JANET_SIGNAL_USER9; if (s < 0) s = 0; vm_return(s, stack[B]); } VM_OP(JOP_PROPAGATE) { Janet fv = stack[C]; vm_assert_type(fv, JANET_FIBER); JanetFiber *f = janet_unwrap_fiber(fv); JanetFiberStatus sub_status = janet_fiber_status(f); if (sub_status > JANET_STATUS_USER9) { vm_commit(); janet_panicf("cannot propagate from fiber with status :%s", janet_status_names[sub_status]); } fiber->child = f; vm_return((int) sub_status, stack[B]); } VM_OP(JOP_CANCEL) { Janet retreg; vm_assert_type(stack[B], JANET_FIBER); JanetFiber *child = janet_unwrap_fiber(stack[B]); if (janet_check_can_resume(child, &retreg, 1)) { vm_commit(); janet_panicv(retreg); } fiber->child = child; JanetSignal sig = janet_continue_signal(child, stack[C], &retreg, JANET_SIGNAL_ERROR); if (sig != JANET_SIGNAL_OK && !(child->flags & (1 << sig))) { vm_return(sig, retreg); } fiber->child = NULL; stack = fiber->data + fiber->frame; stack[A] = retreg; vm_checkgc_pcnext(); } VM_OP(JOP_PUT) vm_commit(); fiber->flags |= JANET_FIBER_RESUME_NO_USEVAL; janet_put(stack[A], stack[B], stack[C]); fiber->flags &= ~JANET_FIBER_RESUME_NO_USEVAL; vm_checkgc_pcnext(); VM_OP(JOP_PUT_INDEX) vm_commit(); fiber->flags |= JANET_FIBER_RESUME_NO_USEVAL; janet_putindex(stack[A], C, stack[B]); fiber->flags &= ~JANET_FIBER_RESUME_NO_USEVAL; vm_checkgc_pcnext(); VM_OP(JOP_IN) vm_commit(); stack[A] = janet_in(stack[B], stack[C]); vm_pcnext(); VM_OP(JOP_GET) vm_commit(); stack[A] = janet_get(stack[B], stack[C]); vm_pcnext(); VM_OP(JOP_GET_INDEX) vm_commit(); stack[A] = janet_getindex(stack[B], C); vm_pcnext(); VM_OP(JOP_LENGTH) vm_commit(); stack[A] = janet_lengthv(stack[E]); vm_pcnext(); VM_OP(JOP_MAKE_ARRAY) { int32_t count = fiber->stacktop - fiber->stackstart; Janet *mem = fiber->data + fiber->stackstart; stack[D] = janet_wrap_array(janet_array_n(mem, count)); fiber->stacktop = fiber->stackstart; vm_checkgc_pcnext(); } VM_OP(JOP_MAKE_TUPLE) /* fallthrough */ VM_OP(JOP_MAKE_BRACKET_TUPLE) { int32_t count = fiber->stacktop - fiber->stackstart; Janet *mem = fiber->data + fiber->stackstart; const Janet *tup = janet_tuple_n(mem, count); if (opcode == JOP_MAKE_BRACKET_TUPLE) janet_tuple_flag(tup) |= JANET_TUPLE_FLAG_BRACKETCTOR; stack[D] = janet_wrap_tuple(tup); fiber->stacktop = fiber->stackstart; vm_checkgc_pcnext(); } VM_OP(JOP_MAKE_TABLE) { int32_t count = fiber->stacktop - fiber->stackstart; Janet *mem = fiber->data + fiber->stackstart; if (count & 1) { vm_commit(); janet_panicf("expected even number of arguments to table constructor, got %d", count); } JanetTable *table = janet_table(count / 2); for (int32_t i = 0; i < count; i += 2) janet_table_put(table, mem[i], mem[i + 1]); stack[D] = janet_wrap_table(table); fiber->stacktop = fiber->stackstart; vm_checkgc_pcnext(); } VM_OP(JOP_MAKE_STRUCT) { int32_t count = fiber->stacktop - fiber->stackstart; Janet *mem = fiber->data + fiber->stackstart; if (count & 1) { vm_commit(); janet_panicf("expected even number of arguments to struct constructor, got %d", count); } JanetKV *st = janet_struct_begin(count / 2); for (int32_t i = 0; i < count; i += 2) janet_struct_put(st, mem[i], mem[i + 1]); stack[D] = janet_wrap_struct(janet_struct_end(st)); fiber->stacktop = fiber->stackstart; vm_checkgc_pcnext(); } VM_OP(JOP_MAKE_STRING) { int32_t count = fiber->stacktop - fiber->stackstart; Janet *mem = fiber->data + fiber->stackstart; JanetBuffer buffer; janet_buffer_init(&buffer, 10 * count); for (int32_t i = 0; i < count; i++) janet_to_string_b(&buffer, mem[i]); stack[D] = janet_stringv(buffer.data, buffer.count); janet_buffer_deinit(&buffer); fiber->stacktop = fiber->stackstart; vm_checkgc_pcnext(); } VM_OP(JOP_MAKE_BUFFER) { int32_t count = fiber->stacktop - fiber->stackstart; Janet *mem = fiber->data + fiber->stackstart; JanetBuffer *buffer = janet_buffer(10 * count); for (int32_t i = 0; i < count; i++) janet_to_string_b(buffer, mem[i]); stack[D] = janet_wrap_buffer(buffer); fiber->stacktop = fiber->stackstart; vm_checkgc_pcnext(); } VM_END() } /* * Execute a single instruction in the fiber. Does this by inspecting * the fiber, setting a breakpoint at the next instruction, executing, and * reseting breakpoints to how they were prior. Yes, it's a bit hacky. */ JanetSignal janet_step(JanetFiber *fiber, Janet in, Janet *out) { /* No finished or currently alive fibers. */ JanetFiberStatus status = janet_fiber_status(fiber); if (status == JANET_STATUS_ALIVE || status == JANET_STATUS_DEAD || status == JANET_STATUS_ERROR) { janet_panicf("cannot step fiber with status :%s", janet_status_names[status]); } /* Get PC for setting breakpoints */ uint32_t *pc = janet_stack_frame(fiber->data + fiber->frame)->pc; /* Check current opcode (sans debug flag). This tells us where the next or next two candidate * instructions will be. Usually it's the next instruction in memory, * but for branching instructions it is also the target of the branch. */ uint32_t *nexta = NULL, *nextb = NULL, olda = 0, oldb = 0; /* Set temporary breakpoints */ switch (*pc & 0x7F) { default: nexta = pc + 1; break; /* These we just ignore for now. Supporting them means * we could step into and out of functions (including JOP_CALL). */ case JOP_RETURN_NIL: case JOP_RETURN: case JOP_ERROR: case JOP_TAILCALL: break; case JOP_JUMP: nexta = pc + DS; break; case JOP_JUMP_IF: case JOP_JUMP_IF_NOT: nexta = pc + 1; nextb = pc + ES; break; } if (nexta) { olda = *nexta; *nexta |= 0x80; } if (nextb) { oldb = *nextb; *nextb |= 0x80; } /* Go */ JanetSignal signal = janet_continue(fiber, in, out); /* Restore */ if (nexta) *nexta = olda; if (nextb) *nextb = oldb; return signal; } static Janet void_cfunction(int32_t argc, Janet *argv) { (void) argc; (void) argv; janet_panic("placeholder"); } Janet janet_call(JanetFunction *fun, int32_t argc, const Janet *argv) { /* Check entry conditions */ if (!janet_vm.fiber) janet_panic("janet_call failed because there is no current fiber"); if (janet_vm.stackn >= JANET_RECURSION_GUARD) janet_panic("C stack recursed too deeply"); /* Dirty stack */ int32_t dirty_stack = janet_vm.fiber->stacktop - janet_vm.fiber->stackstart; if (dirty_stack) { janet_fiber_cframe(janet_vm.fiber, void_cfunction); } /* Tracing */ if (fun->gc.flags & JANET_FUNCFLAG_TRACE) { janet_vm.stackn++; vm_do_trace(fun, argc, argv); janet_vm.stackn--; } /* Push frame */ janet_fiber_pushn(janet_vm.fiber, argv, argc); if (janet_fiber_funcframe(janet_vm.fiber, fun)) { int32_t min = fun->def->min_arity; int32_t max = fun->def->max_arity; Janet funv = janet_wrap_function(fun); if (min == max && min != argc) janet_panicf("arity mismatch in %v, expected %d, got %d", funv, min, argc); if (min >= 0 && argc < min) janet_panicf("arity mismatch in %v, expected at least %d, got %d", funv, min, argc); janet_panicf("arity mismatch in %v, expected at most %d, got %d", funv, max, argc); } janet_fiber_frame(janet_vm.fiber)->flags |= JANET_STACKFRAME_ENTRANCE; /* Set up */ int32_t oldn = janet_vm.stackn++; int handle = janet_gclock(); /* Run vm */ janet_vm.fiber->flags |= JANET_FIBER_RESUME_NO_USEVAL | JANET_FIBER_RESUME_NO_SKIP; JanetSignal signal = run_vm(janet_vm.fiber, janet_wrap_nil()); /* Teardown */ janet_vm.stackn = oldn; janet_gcunlock(handle); if (dirty_stack) { janet_fiber_popframe(janet_vm.fiber); janet_vm.fiber->stacktop += dirty_stack; } if (signal != JANET_SIGNAL_OK) { janet_panicv(*janet_vm.return_reg); } return *janet_vm.return_reg; } static JanetSignal janet_check_can_resume(JanetFiber *fiber, Janet *out, int is_cancel) { /* Check conditions */ JanetFiberStatus old_status = janet_fiber_status(fiber); if (janet_vm.stackn >= JANET_RECURSION_GUARD) { janet_fiber_set_status(fiber, JANET_STATUS_ERROR); *out = janet_cstringv("C stack recursed too deeply"); return JANET_SIGNAL_ERROR; } /* If a "task" fiber is trying to be used as a normal fiber, detect that. See bug #920. * Fibers must be marked as root fibers manually, or by the ev scheduler. */ if (janet_vm.fiber != NULL && (fiber->gc.flags & JANET_FIBER_FLAG_ROOT)) { #ifdef JANET_EV *out = janet_cstringv(is_cancel ? "cannot cancel root fiber, use ev/cancel" : "cannot resume root fiber, use ev/go"); #else *out = janet_cstringv(is_cancel ? "cannot cancel root fiber" : "cannot resume root fiber"); #endif return JANET_SIGNAL_ERROR; } if (old_status == JANET_STATUS_ALIVE || old_status == JANET_STATUS_DEAD || (old_status >= JANET_STATUS_USER0 && old_status <= JANET_STATUS_USER4) || old_status == JANET_STATUS_ERROR) { const uint8_t *str = janet_formatc("cannot resume fiber with status :%s", janet_status_names[old_status]); *out = janet_wrap_string(str); return JANET_SIGNAL_ERROR; } return JANET_SIGNAL_OK; } void janet_try_init(JanetTryState *state) { state->stackn = janet_vm.stackn++; state->gc_handle = janet_vm.gc_suspend; state->vm_fiber = janet_vm.fiber; state->vm_jmp_buf = janet_vm.signal_buf; state->vm_return_reg = janet_vm.return_reg; janet_vm.return_reg = &(state->payload); janet_vm.signal_buf = &(state->buf); } void janet_restore(JanetTryState *state) { janet_vm.stackn = state->stackn; janet_vm.gc_suspend = state->gc_handle; janet_vm.fiber = state->vm_fiber; janet_vm.signal_buf = state->vm_jmp_buf; janet_vm.return_reg = state->vm_return_reg; } static JanetSignal janet_continue_no_check(JanetFiber *fiber, Janet in, Janet *out) { JanetFiberStatus old_status = janet_fiber_status(fiber); #ifdef JANET_EV janet_fiber_did_resume(fiber); #endif /* Clear last value */ fiber->last_value = janet_wrap_nil(); /* Continue child fiber if it exists */ if (fiber->child) { if (janet_vm.root_fiber == NULL) janet_vm.root_fiber = fiber; JanetFiber *child = fiber->child; uint32_t instr = (janet_stack_frame(fiber->data + fiber->frame)->pc)[0]; janet_vm.stackn++; JanetSignal sig = janet_continue(child, in, &in); janet_vm.stackn--; if (janet_vm.root_fiber == fiber) janet_vm.root_fiber = NULL; if (sig != JANET_SIGNAL_OK && !(child->flags & (1 << sig))) { *out = in; janet_fiber_set_status(fiber, sig); return sig; } /* Check if we need any special handling for certain opcodes */ switch (instr & 0x7F) { default: break; case JOP_NEXT: { if (sig == JANET_SIGNAL_OK || sig == JANET_SIGNAL_ERROR || sig == JANET_SIGNAL_USER0 || sig == JANET_SIGNAL_USER1 || sig == JANET_SIGNAL_USER2 || sig == JANET_SIGNAL_USER3 || sig == JANET_SIGNAL_USER4) { in = janet_wrap_nil(); } else { in = janet_wrap_integer(0); } break; } } fiber->child = NULL; } /* Handle new fibers being resumed with a non-nil value */ if (old_status == JANET_STATUS_NEW && !janet_checktype(in, JANET_NIL)) { Janet *stack = fiber->data + fiber->frame; JanetFunction *func = janet_stack_frame(stack)->func; if (func) { if (func->def->arity > 0) { stack[0] = in; } else if (func->def->flags & JANET_FUNCDEF_FLAG_VARARG) { stack[0] = janet_wrap_tuple(janet_tuple_n(&in, 1)); } } } /* Save global state */ JanetTryState tstate; JanetSignal sig = janet_try(&tstate); if (!sig) { /* Normal setup */ if (janet_vm.root_fiber == NULL) janet_vm.root_fiber = fiber; janet_vm.fiber = fiber; janet_fiber_set_status(fiber, JANET_STATUS_ALIVE); sig = run_vm(fiber, in); } /* Restore */ if (janet_vm.root_fiber == fiber) janet_vm.root_fiber = NULL; janet_fiber_set_status(fiber, sig); janet_restore(&tstate); fiber->last_value = tstate.payload; *out = tstate.payload; return sig; } /* Enter the main vm loop */ JanetSignal janet_continue(JanetFiber *fiber, Janet in, Janet *out) { /* Check conditions */ JanetSignal tmp_signal = janet_check_can_resume(fiber, out, 0); if (tmp_signal) return tmp_signal; return janet_continue_no_check(fiber, in, out); } /* Enter the main vm loop but immediately raise a signal */ JanetSignal janet_continue_signal(JanetFiber *fiber, Janet in, Janet *out, JanetSignal sig) { JanetSignal tmp_signal = janet_check_can_resume(fiber, out, sig != JANET_SIGNAL_OK); if (tmp_signal) return tmp_signal; if (sig != JANET_SIGNAL_OK) { JanetFiber *child = fiber; while (child->child) child = child->child; child->gc.flags &= ~JANET_FIBER_STATUS_MASK; child->gc.flags |= sig << JANET_FIBER_STATUS_OFFSET; child->flags |= JANET_FIBER_RESUME_SIGNAL; } return janet_continue_no_check(fiber, in, out); } JanetSignal janet_pcall( JanetFunction *fun, int32_t argc, const Janet *argv, Janet *out, JanetFiber **f) { JanetFiber *fiber; if (f && *f) { fiber = janet_fiber_reset(*f, fun, argc, argv); } else { fiber = janet_fiber(fun, 64, argc, argv); } if (f) *f = fiber; if (!fiber) { *out = janet_cstringv("arity mismatch"); return JANET_SIGNAL_ERROR; } return janet_continue(fiber, janet_wrap_nil(), out); } Janet janet_mcall(const char *name, int32_t argc, Janet *argv) { /* At least 1 argument */ if (argc < 1) { janet_panicf("method :%s expected at least 1 argument", name); } /* Find method */ Janet method = janet_method_lookup(argv[0], name); if (janet_checktype(method, JANET_NIL)) { janet_panicf("could not find method :%s for %v", name, argv[0]); } /* Invoke method */ return janet_method_invoke(method, argc, argv); } /* Setup VM */ int janet_init(void) { /* Garbage collection */ janet_vm.blocks = NULL; janet_vm.next_collection = 0; janet_vm.gc_interval = 0x400000; janet_vm.block_count = 0; janet_symcache_init(); /* Initialize gc roots */ janet_vm.roots = NULL; janet_vm.root_count = 0; janet_vm.root_capacity = 0; /* Scratch memory */ janet_vm.user = NULL; janet_vm.scratch_mem = NULL; janet_vm.scratch_len = 0; janet_vm.scratch_cap = 0; /* Initialize registry */ janet_vm.registry = NULL; janet_vm.registry_cap = 0; janet_vm.registry_count = 0; janet_vm.registry_dirty = 0; /* Intialize abstract registry */ janet_vm.abstract_registry = janet_table(0); janet_gcroot(janet_wrap_table(janet_vm.abstract_registry)); /* Traversal */ janet_vm.traversal = NULL; janet_vm.traversal_base = NULL; janet_vm.traversal_top = NULL; /* Core env */ janet_vm.core_env = NULL; /* Auto suspension */ janet_vm.auto_suspend = 0; /* Dynamic bindings */ janet_vm.top_dyns = NULL; /* Seed RNG */ janet_rng_seed(janet_default_rng(), 0); /* Fibers */ janet_vm.fiber = NULL; janet_vm.root_fiber = NULL; janet_vm.stackn = 0; #ifdef JANET_EV janet_ev_init(); #endif #ifdef JANET_NET janet_net_init(); #endif return 0; } /* Clear all memory associated with the VM */ void janet_deinit(void) { janet_clear_memory(); janet_symcache_deinit(); janet_free(janet_vm.roots); janet_vm.roots = NULL; janet_vm.root_count = 0; janet_vm.root_capacity = 0; janet_vm.abstract_registry = NULL; janet_vm.core_env = NULL; janet_vm.top_dyns = NULL; janet_vm.user = NULL; janet_free(janet_vm.traversal_base); janet_vm.fiber = NULL; janet_vm.root_fiber = NULL; janet_free(janet_vm.registry); janet_vm.registry = NULL; #ifdef JANET_EV janet_ev_deinit(); #endif #ifdef JANET_NET janet_net_deinit(); #endif }