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py/compile: Put compiler state on the C stack.

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It's relatively small (between 44 and 56 bytes) and helps to reduce heap
pressure and fragmentation during compilation.
This commit is contained in:
Damien George 2015-09-24 13:15:57 +01:00
parent 5572f735b6
commit 9d5e5c08ab
1 changed files with 7 additions and 13 deletions
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20
py/compile.c
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@ -3,7 +3,7 @@
* *
* The MIT License (MIT) * The MIT License (MIT)
* *
* Copyright (c) 2013, 2014 Damien P. George * Copyright (c) 2013-2015 Damien P. George
* *
* Permission is hereby granted, free of charge, to any person obtaining a copy * Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal * of this software and associated documentation files (the "Software"), to deal
@ -3316,10 +3316,12 @@ STATIC void scope_compute_things(scope_t *scope) {
} }
mp_obj_t mp_compile(mp_parse_node_t pn, qstr source_file, uint emit_opt, bool is_repl) { mp_obj_t mp_compile(mp_parse_node_t pn, qstr source_file, uint emit_opt, bool is_repl) {
compiler_t *comp = m_new0(compiler_t, 1); // put compiler state on the stack, it's relatively small
compiler_t comp_state = {0};
compiler_t *comp = &comp_state;
comp->source_file = source_file; comp->source_file = source_file;
comp->is_repl = is_repl; comp->is_repl = is_repl;
comp->compile_error = MP_OBJ_NULL;
// create the module scope // create the module scope
scope_t *module_scope = scope_new_and_link(comp, SCOPE_MODULE, pn, emit_opt); scope_t *module_scope = scope_new_and_link(comp, SCOPE_MODULE, pn, emit_opt);
@ -3339,10 +3341,6 @@ mp_obj_t mp_compile(mp_parse_node_t pn, qstr source_file, uint emit_opt, bool is
#if MICROPY_EMIT_NATIVE #if MICROPY_EMIT_NATIVE
comp->emit_method_table = &emit_bc_method_table; comp->emit_method_table = &emit_bc_method_table;
#endif #endif
#if MICROPY_EMIT_INLINE_THUMB
comp->emit_inline_asm = NULL;
comp->emit_inline_asm_method_table = NULL;
#endif
uint max_num_labels = 0; uint max_num_labels = 0;
for (scope_t *s = comp->scope_head; s != NULL && comp->compile_error == MP_OBJ_NULL; s = s->next) { for (scope_t *s = comp->scope_head; s != NULL && comp->compile_error == MP_OBJ_NULL; s = s->next) {
if (false) { if (false) {
@ -3495,12 +3493,8 @@ mp_obj_t mp_compile(mp_parse_node_t pn, qstr source_file, uint emit_opt, bool is
s = next; s = next;
} }
// free the compiler if (comp->compile_error != MP_OBJ_NULL) {
mp_obj_t compile_error = comp->compile_error; nlr_raise(comp->compile_error);
m_del_obj(compiler_t, comp);
if (compile_error != MP_OBJ_NULL) {
nlr_raise(compile_error);
} else { } else {
// return function that executes the outer module // return function that executes the outer module
return mp_make_function_from_raw_code(outer_raw_code, MP_OBJ_NULL, MP_OBJ_NULL); return mp_make_function_from_raw_code(outer_raw_code, MP_OBJ_NULL, MP_OBJ_NULL);