393 lines
14 KiB
C
393 lines
14 KiB
C
#include <stdint.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <assert.h>
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#include "nlr.h"
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#include "misc.h"
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#include "mpyconfig.h"
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#include "runtime.h"
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#include "bc.h"
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// (value) stack grows down (to be compatible with native code when passing pointers to the stack), top element is pointed to
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// exception stack grows up, top element is pointed to
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#define DECODE_UINT do { unum = *ip++; if (unum > 127) { unum = ((unum & 0x3f) << 8) | (*ip++); } } while (0)
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#define DECODE_QSTR do { qstr = *ip++; if (qstr > 127) { qstr = ((qstr & 0x3f) << 8) | (*ip++); } } while (0)
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#define PUSH(val) *--sp = (val)
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#define POP() (*sp++)
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// args are in reverse order in array
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py_obj_t py_execute_byte_code(const byte *code, const py_obj_t *args, uint n_args) {
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py_obj_t state[18]; // TODO allocate properly
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// init args
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for (int i = 0; i < n_args; i++) {
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assert(i < 8);
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state[i] = args[n_args - 1 - i];
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}
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py_obj_t *sp = &state[18];
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const byte *ip = code;
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if (py_execute_byte_code_2(code, &ip, &state[0], &sp)) {
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// it shouldn't yield
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assert(0);
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}
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assert(sp == &state[17]);
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return *sp;
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}
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// fastn has items in normal order
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// sp points to top of stack which grows down
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bool py_execute_byte_code_2(const byte *code, const byte **ip_in_out, py_obj_t *fastn, py_obj_t **sp_in_out) {
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// careful: be sure to declare volatile any variables read in the exception handler (written is ok, I think)
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const byte *ip = *ip_in_out;
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py_obj_t *sp = *sp_in_out;
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machine_uint_t unum;
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machine_int_t snum;
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qstr qstr;
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py_obj_t obj1, obj2;
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py_obj_t fast0 = fastn[0], fast1 = fastn[1], fast2 = fastn[2];
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nlr_buf_t nlr;
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// on the exception stack we store (ip, sp) for each block
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machine_uint_t exc_stack[8];
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machine_uint_t *volatile exc_sp = &exc_stack[-1]; // stack grows up, exc_sp points to top of stack
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// outer exception handling loop
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for (;;) {
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if (nlr_push(&nlr) == 0) {
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// loop to execute byte code
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for (;;) {
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int op = *ip++;
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switch (op) {
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case PYBC_LOAD_CONST_FALSE:
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PUSH(py_const_false);
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break;
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case PYBC_LOAD_CONST_NONE:
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PUSH(py_const_none);
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break;
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case PYBC_LOAD_CONST_TRUE:
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PUSH(py_const_true);
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break;
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case PYBC_LOAD_CONST_SMALL_INT:
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snum = ip[0] | (ip[1] << 8);
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if (snum & 0x8000) {
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snum |= ~0xffff;
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}
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ip += 2;
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PUSH((py_obj_t)(snum << 1 | 1));
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break;
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case PYBC_LOAD_CONST_ID:
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DECODE_QSTR;
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PUSH(rt_load_const_str(qstr)); // TODO
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break;
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case PYBC_LOAD_CONST_STRING:
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DECODE_QSTR;
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PUSH(rt_load_const_str(qstr));
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break;
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case PYBC_LOAD_FAST_0:
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PUSH(fast0);
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break;
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case PYBC_LOAD_FAST_1:
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PUSH(fast1);
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break;
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case PYBC_LOAD_FAST_2:
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PUSH(fast2);
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break;
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case PYBC_LOAD_FAST_N:
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DECODE_UINT;
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PUSH(fastn[unum]);
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break;
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case PYBC_LOAD_NAME:
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DECODE_QSTR;
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PUSH(rt_load_name(qstr));
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break;
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case PYBC_LOAD_GLOBAL:
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DECODE_QSTR;
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PUSH(rt_load_global(qstr));
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break;
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case PYBC_LOAD_ATTR:
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DECODE_QSTR;
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*sp = rt_load_attr(*sp, qstr);
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break;
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case PYBC_LOAD_METHOD:
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DECODE_QSTR;
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sp -= 1;
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rt_load_method(sp[1], qstr, sp);
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break;
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case PYBC_LOAD_BUILD_CLASS:
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PUSH(rt_load_build_class());
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break;
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case PYBC_STORE_FAST_0:
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fast0 = POP();
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break;
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case PYBC_STORE_FAST_1:
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fast1 = POP();
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break;
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case PYBC_STORE_FAST_2:
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fast2 = POP();
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break;
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case PYBC_STORE_FAST_N:
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DECODE_UINT;
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fastn[unum] = POP();
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break;
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case PYBC_STORE_NAME:
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DECODE_QSTR;
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rt_store_name(qstr, POP());
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break;
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case PYBC_STORE_ATTR:
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DECODE_QSTR;
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rt_store_attr(sp[0], qstr, sp[1]);
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sp += 2;
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break;
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case PYBC_STORE_SUBSCR:
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rt_store_subscr(sp[1], sp[0], sp[2]);
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sp += 3;
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break;
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case PYBC_DUP_TOP:
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obj1 = *sp;
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PUSH(obj1);
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break;
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case PYBC_DUP_TOP_TWO:
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sp -= 2;
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sp[0] = sp[2];
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sp[1] = sp[3];
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break;
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case PYBC_POP_TOP:
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++sp;
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break;
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case PYBC_ROT_THREE:
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obj1 = sp[0];
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sp[0] = sp[1];
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sp[1] = sp[2];
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sp[2] = obj1;
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break;
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case PYBC_JUMP:
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DECODE_UINT;
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ip = code + unum;
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break;
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case PYBC_POP_JUMP_IF_TRUE:
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DECODE_UINT;
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if (rt_is_true(POP())) {
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ip = code + unum;
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}
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break;
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case PYBC_POP_JUMP_IF_FALSE:
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DECODE_UINT;
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if (!rt_is_true(POP())) {
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ip = code + unum;
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}
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break;
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/* we are trying to get away without using this opcode
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case PYBC_SETUP_LOOP:
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DECODE_UINT;
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// push_block(PYBC_SETUP_LOOP, code + unum, sp)
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break;
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*/
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case PYBC_SETUP_EXCEPT:
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DECODE_UINT;
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*++exc_sp = (machine_uint_t)code + unum;
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*++exc_sp = (machine_uint_t)sp;
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break;
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case PYBC_END_FINALLY:
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// not implemented
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// if TOS is an exception, reraises the exception (3 values on TOS)
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// if TOS is an integer, does something else
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// if TOS is None, just pops it and continues
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// else error
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assert(0);
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break;
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case PYBC_GET_ITER:
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*sp = rt_getiter(*sp);
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break;
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case PYBC_FOR_ITER:
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DECODE_UINT; // the jump offset if iteration finishes
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obj1 = rt_iternext(*sp);
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if (obj1 == py_const_stop_iteration) {
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++sp; // pop the exhausted iterator
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ip = code + unum; // jump to after for-block
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} else {
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PUSH(obj1); // push the next iteration value
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}
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break;
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case PYBC_POP_BLOCK:
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// pops block and restores the stack
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assert(0);
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break;
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case PYBC_POP_EXCEPT:
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// TODO need to work out how blocks work etc
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// pops block, checks it's an exception block, and restores the stack, saving the 3 exception values to local threadstate
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assert(exc_sp >= &exc_stack[0]);
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//sp = (py_obj_t*)(*exc_sp--);
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//exc_sp--; // discard ip
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exc_sp -= 2;
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//sp += 3; // pop 3 exception values
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break;
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case PYBC_BINARY_OP:
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unum = *ip++;
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obj2 = POP();
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obj1 = *sp;
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*sp = rt_binary_op(unum, obj1, obj2);
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break;
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case PYBC_COMPARE_OP:
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unum = *ip++;
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obj2 = POP();
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obj1 = *sp;
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*sp = rt_compare_op(unum, obj1, obj2);
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break;
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case PYBC_BUILD_TUPLE:
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DECODE_UINT;
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obj1 = rt_build_tuple(unum, sp);
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sp += unum - 1;
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*sp = obj1;
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break;
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case PYBC_BUILD_LIST:
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DECODE_UINT;
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obj1 = rt_build_list(unum, sp);
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sp += unum - 1;
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*sp = obj1;
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break;
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case PYBC_LIST_APPEND:
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DECODE_UINT;
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// I think it's guaranteed by the compiler that sp[unum] is a list
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rt_list_append(sp[unum], sp[0]);
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sp++;
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break;
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case PYBC_BUILD_MAP:
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DECODE_UINT;
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PUSH(rt_build_map(unum));
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break;
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case PYBC_STORE_MAP:
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sp += 2;
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rt_store_map(sp[0], sp[-2], sp[-1]);
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break;
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case PYBC_MAP_ADD:
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DECODE_UINT;
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// I think it's guaranteed by the compiler that sp[unum + 1] is a map
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rt_store_map(sp[unum + 1], sp[0], sp[1]);
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sp += 2;
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break;
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case PYBC_BUILD_SET:
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DECODE_UINT;
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obj1 = rt_build_set(unum, sp);
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sp += unum - 1;
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*sp = obj1;
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break;
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case PYBC_SET_ADD:
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DECODE_UINT;
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// I think it's guaranteed by the compiler that sp[unum] is a set
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rt_store_set(sp[unum], sp[0]);
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sp++;
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break;
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case PYBC_MAKE_FUNCTION:
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DECODE_UINT;
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PUSH(rt_make_function_from_id(unum));
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break;
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case PYBC_CALL_FUNCTION:
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DECODE_UINT;
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assert((unum & 0xff00) == 0); // n_keyword
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unum &= 0xff; // n_positional
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sp += unum;
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*sp = rt_call_function_n(*sp, unum, sp - unum);
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break;
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case PYBC_CALL_METHOD:
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DECODE_UINT;
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assert((unum & 0xff00) == 0); // n_keyword
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unum &= 0xff;
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obj1 = rt_call_method_n(unum, sp);
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sp += unum + 1;
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*sp = obj1;
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break;
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case PYBC_RETURN_VALUE:
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nlr_pop();
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*sp_in_out = sp;
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assert(exc_sp == &exc_stack[-1]);
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return false;
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case PYBC_YIELD_VALUE:
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nlr_pop();
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*ip_in_out = ip;
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fastn[0] = fast0;
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fastn[1] = fast1;
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fastn[2] = fast2;
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*sp_in_out = sp;
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return true;
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default:
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printf("code %p, offset %u, byte code 0x%02x not implemented\n", code, (uint)(ip - code), op);
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assert(0);
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nlr_pop();
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return false;
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}
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}
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} else {
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// exception occurred
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if (exc_sp >= &exc_stack[0]) {
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// catch exception and pass to byte code
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sp = (py_obj_t*)(exc_sp[0]);
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ip = (const byte*)(exc_sp[-1]);
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// push(traceback, exc-val, exc-type)
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PUSH(py_const_none);
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PUSH(nlr.ret_val);
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PUSH(py_const_none);
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} else {
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// re-raise exception
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// TODO what to do if this is a generator??
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nlr_jump(nlr.ret_val);
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}
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}
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}
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}
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