py/emit: Combine break_loop and continue_loop into one emit function.

Reduces code size by:

   bare-arm:    +0
minimal x86:    +0
   unix x64:   -80
unix nanbox:    +0
      stm32:   -12
     cc3200:    +0
    esp8266:   -28
      esp32:    +0

py/compile.c

@@ -950,7 +950,7 @@ STATIC void compile_break_stmt(compiler_t *comp, mp_parse_node_struct_t *pns) {
         compile_syntax_error(comp, (mp_parse_node_t)pns, "'break' outside loop");
     }
     assert(comp->cur_except_level >= comp->break_continue_except_level);
-    EMIT_ARG(break_loop, comp->break_label, comp->cur_except_level - comp->break_continue_except_level);
+    EMIT_ARG(unwind_jump, comp->break_label, comp->cur_except_level - comp->break_continue_except_level);
 }
 
 STATIC void compile_continue_stmt(compiler_t *comp, mp_parse_node_struct_t *pns) {
@@ -958,7 +958,7 @@ STATIC void compile_continue_stmt(compiler_t *comp, mp_parse_node_struct_t *pns)
         compile_syntax_error(comp, (mp_parse_node_t)pns, "'continue' outside loop");
     }
     assert(comp->cur_except_level >= comp->break_continue_except_level);
-    EMIT_ARG(continue_loop, comp->continue_label, comp->cur_except_level - comp->break_continue_except_level);
+    EMIT_ARG(unwind_jump, comp->continue_label, comp->cur_except_level - comp->break_continue_except_level);
 }
 
 STATIC void compile_return_stmt(compiler_t *comp, mp_parse_node_struct_t *pns) {

py/emit.h

@@ -122,8 +122,7 @@ typedef struct _emit_method_table_t {
     void (*jump)(emit_t *emit, mp_uint_t label);
     void (*pop_jump_if)(emit_t *emit, bool cond, mp_uint_t label);
     void (*jump_if_or_pop)(emit_t *emit, bool cond, mp_uint_t label);
-    void (*break_loop)(emit_t *emit, mp_uint_t label, mp_uint_t except_depth);
-    void (*continue_loop)(emit_t *emit, mp_uint_t label, mp_uint_t except_depth);
+    void (*unwind_jump)(emit_t *emit, mp_uint_t label, mp_uint_t except_depth);
     void (*setup_with)(emit_t *emit, mp_uint_t label);
     void (*with_cleanup)(emit_t *emit, mp_uint_t label);
     void (*setup_except)(emit_t *emit, mp_uint_t label);
@@ -227,8 +226,6 @@ void mp_emit_bc_jump(emit_t *emit, mp_uint_t label);
 void mp_emit_bc_pop_jump_if(emit_t *emit, bool cond, mp_uint_t label);
 void mp_emit_bc_jump_if_or_pop(emit_t *emit, bool cond, mp_uint_t label);
 void mp_emit_bc_unwind_jump(emit_t *emit, mp_uint_t label, mp_uint_t except_depth);
-#define mp_emit_bc_break_loop mp_emit_bc_unwind_jump
-#define mp_emit_bc_continue_loop mp_emit_bc_unwind_jump
 void mp_emit_bc_setup_with(emit_t *emit, mp_uint_t label);
 void mp_emit_bc_with_cleanup(emit_t *emit, mp_uint_t label);
 void mp_emit_bc_setup_except(emit_t *emit, mp_uint_t label);

py/emitbc.c

@@ -967,7 +967,6 @@ const emit_method_table_t emit_bc_method_table = {
     mp_emit_bc_pop_jump_if,
     mp_emit_bc_jump_if_or_pop,
     mp_emit_bc_unwind_jump,
-    mp_emit_bc_unwind_jump,
     mp_emit_bc_setup_with,
     mp_emit_bc_with_cleanup,
     mp_emit_bc_setup_except,

py/emitnative.c

@@ -1560,16 +1560,11 @@ STATIC void emit_native_jump_if_or_pop(emit_t *emit, bool cond, mp_uint_t label)
     emit_post(emit);
 }
 
-STATIC void emit_native_break_loop(emit_t *emit, mp_uint_t label, mp_uint_t except_depth) {
+STATIC void emit_native_unwind_jump(emit_t *emit, mp_uint_t label, mp_uint_t except_depth) {
     (void)except_depth;
     emit_native_jump(emit, label & ~MP_EMIT_BREAK_FROM_FOR); // TODO properly
 }
 
-STATIC void emit_native_continue_loop(emit_t *emit, mp_uint_t label, mp_uint_t except_depth) {
-    (void)except_depth;
-    emit_native_jump(emit, label); // TODO properly
-}
-
 STATIC void emit_native_setup_with(emit_t *emit, mp_uint_t label) {
     // the context manager is on the top of the stack
     // stack: (..., ctx_mgr)
@@ -2248,8 +2243,7 @@ const emit_method_table_t EXPORT_FUN(method_table) = {
     emit_native_jump,
     emit_native_pop_jump_if,
     emit_native_jump_if_or_pop,
-    emit_native_break_loop,
-    emit_native_continue_loop,
+    emit_native_unwind_jump,
     emit_native_setup_with,
     emit_native_with_cleanup,
     emit_native_setup_except,