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py/inlineasm: Add ability to specify return type of asm_thumb funcs.

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Supported return types are: object, bool, int, uint.

For example:

@micropython.asm_thumb
def foo(r0, r1) -> uint:
    add(r0, r0, r1)
This commit is contained in:
Damien George
2016-01-15 15:20:43 +00:00
parent 3d42aa07dd
commit 8f54c08691
10 changed files with 65 additions and 16 deletions
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21
py/compile.c
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@@ -2936,7 +2936,24 @@ STATIC void compile_scope_inline_asm(compiler_t *comp, scope_t *scope, pass_kind
}
}
assert(MP_PARSE_NODE_IS_NULL(pns->nodes[2])); // type
// pns->nodes[2] is function return annotation
mp_uint_t type_sig = MP_NATIVE_TYPE_INT;
mp_parse_node_t pn_annotation = pns->nodes[2];
if (!MP_PARSE_NODE_IS_NULL(pn_annotation)) {
// nodes[2] can be null or a test-expr
if (MP_PARSE_NODE_IS_ID(pn_annotation)) {
qstr ret_type = MP_PARSE_NODE_LEAF_ARG(pn_annotation);
switch (ret_type) {
case MP_QSTR_object: type_sig = MP_NATIVE_TYPE_OBJ; break;
case MP_QSTR_bool: type_sig = MP_NATIVE_TYPE_BOOL; break;
case MP_QSTR_int: type_sig = MP_NATIVE_TYPE_INT; break;
case MP_QSTR_uint: type_sig = MP_NATIVE_TYPE_UINT; break;
default: compile_syntax_error(comp, pn_annotation, "unknown type"); return;
}
} else {
compile_syntax_error(comp, pn_annotation, "return annotation must be an identifier");
}
}
mp_parse_node_t pn_body = pns->nodes[3]; // body
mp_parse_node_t *nodes;
@@ -3028,7 +3045,7 @@ STATIC void compile_scope_inline_asm(compiler_t *comp, scope_t *scope, pass_kind
}
if (comp->pass > MP_PASS_SCOPE) {
EMIT_INLINE_ASM(end_pass);
EMIT_INLINE_ASM_ARG(end_pass, type_sig);
}
if (comp->compile_error != MP_OBJ_NULL) {