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(*
* Copyright 2025 Multikernel Technologies, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*)
open
Alcotest
open
Kernelscript.Ast
open
Kernelscript.Type_checker
open
Kernelscript.Ir_generator
open
Kernelscript.Ebpf_c_codegen
open
Kernelscript.Ir
(*
* Helper functions
*)
let
dummy_pos
=
{ line
=
1
; column
=
1
; filename
=
"
test_struct_init.ks
"
}
let
parse_string
s
=
let
lexbuf
=
Lexing.
from_string s
in
Kernelscript.Parser.
program
Kernelscript.Lexer.
token lexbuf
(*
* Helper to check if string contains substring
*)
let
contains_substr
str
substr
=
try
let
_
=
Str.
search_forward (
Str.
regexp_string substr) str
0
in
true
with
Not_found
->
false
(*
* Helper to generate IR and C code from program text
*)
let
generate_c_from_program
program_text
program_name
=
(*
Initialize context codegens first
*)
Kernelscript_context.Xdp_codegen.
register
()
;
Kernelscript_context.Tc_codegen.
register
()
;
let
ast
=
parse_string program_text
in
let
symbol_table
=
Test_utils.Helpers.
create_test_symbol_table ast
in
let
(annotated_ast, _)
=
type_check_and_annotate_ast
~symbol_table:
(
Some
symbol_table) ast
in
let
ir_multi_prog
=
generate_ir annotated_ast symbol_table program_name
in
(*
Generate C code
*)
let
c_code
=
generate_c_multi_program ir_multi_prog
in
c_code
(*
* Test 1: Basic struct initialization with simple types
*)
let
test_basic_struct_initialization
()
=
let
program_text
=
{
|
struct
PacketInfo
{
size
:
u64
,
action
:
u32
,
}
@
xdp fn packet_filter(ctx:
*xdp_md
) -> xdp_action {
var packet_size
=
ctx->data_end
-
ctx->data
var info
=
PacketInfo
{
size
:
packet_size
,
action
:
2
,
}
if
(info.size
>
1500
) {
return
1
}
return info.action
}
fn main
()
-> i32 {
return
0
}
|
}
in
try
let
c_code
=
generate_c_from_program program_text
"
packet_filter
"
in
(*
Verify struct definition is generated
*)
check
bool
"
struct definition generated
"
true
(contains_substr c_code
"
struct PacketInfo
"
);
check
bool
"
size field defined
"
true
(contains_substr c_code
"
__u64 size
"
);
check
bool
"
action field defined
"
true
(contains_substr c_code
"
__u32 action
"
);
(*
Verify struct initialization syntax
*)
check
bool
"
struct literal assignment found
"
true
(contains_substr c_code
"
(struct PacketInfo){
"
);
check
bool
"
field initialization syntax
"
true
(contains_substr c_code
"
.size =
"
);
check
bool
"
action field initialization
"
true
(contains_substr c_code
"
.action = 2
"
);
(*
Verify field access works
*)
check
bool
"
field access generated
"
true
(contains_substr c_code
"
.size
"
);
check
bool
"
return field access
"
true
(contains_substr c_code
"
.action
"
)
with
|
exn
-> fail (
"
Basic struct initialization test failed:
"
^
Printexc.
to_string
exn
)
(*
* Test 2: Struct initialization with different data types
*)
let
test_struct_with_different_types
()
=
let
program_text
=
{
|
struct
ConfigData
{
mode
:
u64
,
flags
:
u32
,
}
@
xdp fn config_filter(ctx:
*xdp_md
) -> xdp_action {
var packet_size
=
ctx->data_end
-
ctx->data
var info
=
ConfigData
{
mode
:
packet_size
,
flags
:
42
,
}
if
(info.mode
>
1500
) {
return
1
}
return info.flags
}
fn main
()
-> i32 {
return
0
}
|
}
in
try
let
c_code
=
generate_c_from_program program_text
"
config_filter
"
in
(*
Verify all data types are correctly generated
*)
check
bool
"
struct ConfigData defined
"
true
(contains_substr c_code
"
struct ConfigData
"
);
check
bool
"
u64 mode field defined
"
true
(contains_substr c_code
"
__u64 mode
"
);
check
bool
"
u32 flags field defined
"
true
(contains_substr c_code
"
__u32 flags
"
);
(*
Verify struct initialization syntax
*)
check
bool
"
struct literal syntax
"
true
(contains_substr c_code
"
(struct ConfigData){
"
);
check
bool
"
flags literal assignment
"
true
(contains_substr c_code
"
.flags = 42
"
)
with
|
exn
-> fail (
"
Different types struct test failed:
"
^
Printexc.
to_string
exn
)
(*
* Test 3: Struct initialization with variables
*)
let
test_struct_initialization_with_variables
()
=
let
program_text
=
{
|
struct
VariableTest
{
size
:
u64
,
action
:
u32
,
}
@
xdp fn variable_test(ctx:
*xdp_md
) -> xdp_action {
var packet_size
=
ctx->data_end
-
ctx->data
var info
=
VariableTest
{
size
:
packet_size
,
action
:
3
,
}
if
(info.size
>
1500
) {
return
1
}
return info.action
}
fn main
()
-> i32 {
return
0
}
|
}
in
try
let
c_code
=
generate_c_from_program program_text
"
variable_test
"
in
(*
Verify struct definition
*)
check
bool
"
VariableTest struct defined
"
true
(contains_substr c_code
"
struct VariableTest
"
);
check
bool
"
__u64 size field
"
true
(contains_substr c_code
"
__u64 size
"
);
check
bool
"
__u32 action field
"
true
(contains_substr c_code
"
__u32 action
"
);
(*
Verify struct compound literal syntax
*)
check
bool
"
compound literal syntax
"
true
(contains_substr c_code
"
(struct VariableTest){
"
);
check
bool
"
literal field assignment
"
true
(contains_substr c_code
"
.action = 3
"
)
with
|
exn
-> fail (
"
Variable struct initialization test failed:
"
^
Printexc.
to_string
exn
)
(*
* Test 4: Multiple struct definitions and initializations
*)
let
test_multiple_struct_definitions
()
=
let
program_text
=
{
|
struct
Header
{
version
:
u8
,
flags
:
u8
,
}
struct
Payload
{
size
:
u32
,
data_type
:
u16
,
}
@
xdp fn multi_struct(ctx:
*xdp_md
) -> xdp_action {
var hdr
=
Header
{
version
:
1
,
flags
:
0
,
}
var payload
=
Payload
{
size
:
1024
,
data_type
:
42
,
}
if
(hdr.version
==
1
&&
payload.size
>
0
) {
return
2
}
return
1
}
fn main
()
-> i32 {
return
0
}
|
}
in
try
let
c_code
=
generate_c_from_program program_text
"
multi_struct
"
in
(*
Verify both struct definitions are generated
*)
check
bool
"
Header struct defined
"
true
(contains_substr c_code
"
struct Header
"
);
check
bool
"
Payload struct defined
"
true
(contains_substr c_code
"
struct Payload
"
);
(*
Verify both struct initializations
*)
check
bool
"
Header initialization
"
true
(contains_substr c_code
"
(struct Header){
"
);
check
bool
"
Payload initialization
"
true
(contains_substr c_code
"
(struct Payload){
"
);
(*
Verify field assignments for both structs
*)
check
bool
"
Header version assignment
"
true
(contains_substr c_code
"
.version = 1
"
);
check
bool
"
Header flags assignment
"
true
(contains_substr c_code
"
.flags = 0
"
);
check
bool
"
Payload size assignment
"
true
(contains_substr c_code
"
.size = 1024
"
);
check
bool
"
Payload data_type assignment
"
true
(contains_substr c_code
"
.data_type = 42
"
)
with
|
exn
-> fail (
"
Multiple struct definitions test failed:
"
^
Printexc.
to_string
exn
)
(*
* Test 5: Nested struct usage (assignment and field access)
*)
let
test_nested_struct_usage
()
=
let
program_text
=
{
|
struct
FieldTest
{
size
:
u64
,
action
:
u32
,
}
@
xdp fn field_test(ctx:
*xdp_md
) -> xdp_action {
var packet_size
=
ctx->data_end
-
ctx->data
var info
=
FieldTest
{
size
:
packet_size
,
action
:
4
,
}
if
(info.size
>
1500
) {
return
1
}
return info.action
}
fn main
()
-> i32 {
return
0
}
|
}
in
try
let
c_code
=
generate_c_from_program program_text
"
field_test
"
in
(*
Verify struct definition
*)
check
bool
"
FieldTest struct defined
"
true
(contains_substr c_code
"
struct FieldTest
"
);
check
bool
"
__u64 size field
"
true
(contains_substr c_code
"
__u64 size
"
);
check
bool
"
__u32 action field
"
true
(contains_substr c_code
"
__u32 action
"
);
(*
Verify struct initialization
*)
check
bool
"
struct literal syntax
"
true
(contains_substr c_code
"
(struct FieldTest){
"
);
check
bool
"
field initialization
"
true
(contains_substr c_code
"
.action = 4
"
)
with
|
exn
-> fail (
"
Nested struct usage test failed:
"
^
Printexc.
to_string
exn
)
(*
* Test 6: IR generation verification for struct literals
*)
let
test_ir_struct_literal_generation
()
=
let
program_text
=
{
|
struct
TestStruct
{
field1
:
u32
,
field2
:
u64
,
}
@
xdp fn test_ir(ctx:
*xdp_md
) -> xdp_action {
var test_obj
=
TestStruct
{
field1
:
42
,
field2
:
1000
,
}
return test_obj.field1
}
fn main
()
-> i32 {
return
0
}
|
}
in
try
let
ast
=
parse_string program_text
in
let
symbol_table
=
Test_utils.Helpers.
create_test_symbol_table ast
in
let
(annotated_ast, _)
=
type_check_and_annotate_ast
~symbol_table:
(
Some
symbol_table) ast
in
let
ir_multi_prog
=
generate_ir annotated_ast symbol_table
"
test_ir
"
in
(*
Extract the main function from IR
*)
let
test_program
=
List.
find (
fun
prog
-> prog.name
=
"
test_ir
"
) (get_programs ir_multi_prog)
in
let
main_func
=
test_program.entry_function
in
(*
Look for IRStructLiteral in the instructions
*)
let
has_struct_literal
=
ref
false
in
let
check_instruction
instr
=
match
instr.instr_desc
with
|
IRAssign
(
_
,
expr
) ->
(
match
expr.expr_desc
with
|
IRStructLiteral
(
struct_name
,
_
) ->
if
struct_name
=
"
TestStruct
"
then
has_struct_literal
:=
true
|
_
->
()
)
|
IRVariableDecl
(
_
,
_
, Some
expr
) ->
(
match
expr.expr_desc
with
|
IRStructLiteral
(
struct_name
,
_
) ->
if
struct_name
=
"
TestStruct
"
then
has_struct_literal
:=
true
|
_
->
()
)
|
_
->
()
in
List.
iter (
fun
block
->
List.
iter check_instruction block.instructions
) main_func.basic_blocks;
check
bool
"
IRStructLiteral generated in IR
"
true
!
has_struct_literal
with
|
exn
-> fail (
"
IR struct literal generation test failed:
"
^
Printexc.
to_string
exn
)
(*
* Test 7: Struct initialization in function parameters and returns
*)
let
test_struct_as_function_parameter
()
=
let
program_text
=
{
|
struct
Parameter
{
size
:
u64
,
action
:
u32
,
}
@
xdp fn param_test(ctx:
*xdp_md
) -> xdp_action {
var packet_size
=
ctx->data_end
-
ctx->data
var info
=
Parameter
{
size
:
packet_size
,
action
:
5
,
}
if
(info.size
>
1500
) {
return
1
}
return info.action
}
fn main
()
-> i32 {
return
0
}
|
}
in
try
let
c_code
=
generate_c_from_program program_text
"
param_test
"
in
(*
Verify struct definition
*)
check
bool
"
Parameter struct defined
"
true
(contains_substr c_code
"
struct Parameter
"
);
check
bool
"
__u64 size field
"
true
(contains_substr c_code
"
__u64 size
"
);
check
bool
"
__u32 action field
"
true
(contains_substr c_code
"
__u32 action
"
);
(*
Verify struct initialization and field access
*)
check
bool
"
struct initialization
"
true
(contains_substr c_code
"
(struct Parameter){
"
);
check
bool
"
action field assignment
"
true
(contains_substr c_code
"
.action = 5
"
)
with
|
exn
-> fail (
"
Struct as function parameter test failed:
"
^
Printexc.
to_string
exn
)
(*
* All struct initialization tests
*)
let
tests
=
[
"
test_basic_struct_initialization
"
,
`Quick
, test_basic_struct_initialization;
"
test_multiple_struct_definitions
"
,
`Quick
, test_multiple_struct_definitions;
"
test_ir_struct_literal_generation
"
,
`Quick
, test_ir_struct_literal_generation;
]
let
()
=
Alcotest.
run
"
Struct Initialization Tests
"
[
"
struct_initialization
"
, tests
]
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