py/bc: Remove unused mp_opcode_format function.

This was made redundant by f2040bfc7e, which
also did not update this function for the change to qstr-opcode encoding,
so it does not work correctly anyway.

Signed-off-by: Damien George <damien@micropython.org>

py/bc.c

@@ -337,35 +337,3 @@ void mp_setup_code_state_native(mp_code_state_native_t *code_state, size_t n_arg
     mp_setup_code_state_helper((mp_code_state_t *)code_state, n_args, n_kw, args);
 }
 #endif
-
-#if MICROPY_PERSISTENT_CODE_LOAD || MICROPY_PERSISTENT_CODE_SAVE
-
-// The following table encodes the number of bytes that a specific opcode
-// takes up.  Some opcodes have an extra byte, defined by MP_BC_MASK_EXTRA_BYTE.
-uint mp_opcode_format(const byte *ip, size_t *opcode_size, bool count_var_uint) {
-    uint f = MP_BC_FORMAT(*ip);
-    const byte *ip_start = ip;
-    if (f == MP_BC_FORMAT_QSTR) {
-        ip += 3;
-    } else {
-        int extra_byte = (*ip & MP_BC_MASK_EXTRA_BYTE) == 0;
-        ip += 1;
-        if (f == MP_BC_FORMAT_VAR_UINT) {
-            if (count_var_uint) {
-                while ((*ip++ & 0x80) != 0) {
-                }
-            }
-        } else if (f == MP_BC_FORMAT_OFFSET) {
-            if ((*ip & 0x80) == 0) {
-                ip += 1;
-            } else {
-                ip += 2;
-            }
-        }
-        ip += extra_byte;
-    }
-    *opcode_size = ip - ip_start;
-    return f;
-}
-
-#endif // MICROPY_PERSISTENT_CODE_LOAD || MICROPY_PERSISTENT_CODE_SAVE

py/bc.h

@@ -292,12 +292,6 @@ const byte *mp_bytecode_print_str(const mp_print_t *print, const byte *ip_start,
 #define MP_TAGPTR_TAG1(x) ((uintptr_t)(x) & 2)
 #define MP_TAGPTR_MAKE(ptr, tag) ((void *)((uintptr_t)(ptr) | (tag)))
 
-#if MICROPY_PERSISTENT_CODE_LOAD || MICROPY_PERSISTENT_CODE_SAVE
-
-uint mp_opcode_format(const byte *ip, size_t *opcode_size, bool count_var_uint);
-
-#endif
-
 static inline void mp_module_context_alloc_tables(mp_module_context_t *context, size_t n_qstr, size_t n_obj) {
     #if MICROPY_EMIT_BYTECODE_USES_QSTR_TABLE
     size_t nq = (n_qstr * sizeof(qstr_short_t) + sizeof(mp_uint_t) - 1) / sizeof(mp_uint_t);

tools/mpy-tool.py

@@ -326,30 +326,6 @@ def mp_small_int_fits(i):
     return -0x2000 <= i <= 0x1FFF
 
 
-# this function mirrors that in py/bc.c
-def mp_opcode_format(bytecode, ip, count_var_uint):
-    opcode = bytecode[ip]
-    ip_start = ip
-    f = (0x000003A4 >> (2 * ((opcode) >> 4))) & 3
-    if f == MP_BC_FORMAT_QSTR:
-        ip += 3
-    else:
-        extra_byte = (opcode & MP_BC_MASK_EXTRA_BYTE) == 0
-        ip += 1
-        if f == MP_BC_FORMAT_VAR_UINT:
-            if count_var_uint:
-                while bytecode[ip] & 0x80 != 0:
-                    ip += 1
-                ip += 1
-        elif f == MP_BC_FORMAT_OFFSET:
-            if bytecode[ip] & 0x80 == 0:
-                ip += 1
-            else:
-                ip += 2
-        ip += extra_byte
-    return f, ip - ip_start
-
-
 def mp_opcode_decode(bytecode, ip):
     opcode = bytecode[ip]
     ip_start = ip