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generator: sumof: support any type, generate explicit code 

A sumof-expression now generates explicit code ( for-loop etc )
instead of calling xcb_sumof.

This way, it supports any type which can be added.
Previously, only uint_8 was supported.

Here's an example and the generated code:

xml:
<struct name="SumofTest">
   <field type="CARD32" name="len" />
   <list type="CARD16" name="mylist1">
	   <fieldref>len</fieldref>
   </list>
   <list type="CARD8" name="mylist2">
	   <sumof ref="mylist1"/>
   </list>
</struct>

declaration of tempvars at the start of enclosing function:
    int xcb_pre_tmp_1; /* sumof length */
    int xcb_pre_tmp_2; /* sumof loop counter */
    int64_t xcb_pre_tmp_3; /* sumof sum */
    const uint16_t* xcb_pre_tmp_4; /* sumof list ptr */

code:
    /* mylist2 */
    /* sumof start */
    xcb_pre_tmp_1 = _aux->len;
    xcb_pre_tmp_3 = 0;
    xcb_pre_tmp_4 = xcb_input_sumof_test_mylist_1(_aux);
    for ( xcb_pre_tmp_2 = 0; xcb_pre_tmp_2 < xcb_pre_tmp_1; xcb_pre_tmp_2++) {
        xcb_pre_tmp_3 += *xcb_pre_tmp_4;
        xcb_pre_tmp_4++;
    }
    /* sumof end. Result is in xcb_pre_tmp_3 */
    xcb_block_len += xcb_pre_tmp_3 * sizeof(uint8_t);

This patch is also a preparation for sumof which can access
fields of lists of struct, etc.

V2: Changed style and formatting according to suggestions from Ran Benita

Signed-off-by: Christian Linhart <chris@DemoRecorder.com>
Reviewed-by: Ran Benita <ran234@gmail.com>

Message-ID: <54562774.8030306@DemoRecorder.com>
Patch-Thread-Subject: [Xcb] [PATCHSET] ListInputDevices revision 2
Patch-Set: ListInputDevices
Patch-Number: libxcb 4/9
Patch-Version: V2
This commit is contained in:
Christian Linhart 2014-11-02 13:45:40 +01:00 committed by Christian Linhart
parent fda1fb4ed4
commit 4a915c0dba
1 changed files with 24 additions and 2 deletions
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26
src/c_client.py
View File

@ -1628,9 +1628,31 @@ def _c_accessor_get_expr(expr, field_mapping):
raise Exception("list field '%s' referenced by sumof not found" % expr.lenfield_name)
list_name = field_mapping[field.c_field_name][0]
c_length_func = "%s(%s)" % (field.c_length_name, list_name)
# note: xcb_sumof() has only been defined for integers
c_length_func = _c_accessor_get_expr(field.type.expr, field_mapping)
return 'xcb_sumof(%s, %s)' % (list_name, c_length_func)
# create explicit code for computing the sum.
# This works for all C-types which can be added to int64_t with +=
_c_pre.start()
lengthvar = _c_pre.get_tempvarname()
loopvar = _c_pre.get_tempvarname()
sumvar = _c_pre.get_tempvarname()
listvar = _c_pre.get_tempvarname()
_c_pre.tempvar("int %s; /* sumof length */", lengthvar)
_c_pre.tempvar("int %s; /* sumof loop counter */", loopvar)
_c_pre.tempvar("int64_t %s; /* sumof sum */", sumvar)
_c_pre.tempvar("const %s* %s; /* sumof list ptr */", field.c_field_type, listvar)
_c_pre.code("/* sumof start */")
_c_pre.code("%s = %s;", lengthvar, c_length_func)
_c_pre.code("%s = 0;", sumvar)
_c_pre.code("%s = %s;", listvar, list_name)
_c_pre.code("for (%s = 0; %s < %s; %s++) {", loopvar, loopvar, lengthvar, loopvar)
_c_pre.indent()
_c_pre.code("%s += *%s;", sumvar, listvar)
_c_pre.code("%s++;", listvar)
_c_pre.pop_indent()
_c_pre.code("}")
_c_pre.code("/* sumof end. Result is in %s */", sumvar)
_c_pre.end()
return sumvar
elif expr.op != None:
return ('(' + _c_accessor_get_expr(expr.lhs, field_mapping) +
' ' + expr.op + ' ' +