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mruby/src/debug.c at master · bkutil/mruby · GitHub
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#include
<string.h>
#include
<mruby.h>
#include
<mruby/irep.h>
#include
<mruby/debug.h>
static
mrb_irep_debug_info_file
*
get_file
(
mrb_irep_debug_info
*
info
,
uint32_t
pc
)
{
mrb_irep_debug_info_file
*
*
ret
;
int32_t
count
;
if
(
pc
>=
info
->
pc_count
) {
return
NULL
; }
/* get upper bound */
ret
=
info
->
files
;
count
=
info
->
flen
;
while
(
count
>
0
) {
int32_t
step
=
count
/
2
;
mrb_irep_debug_info_file
*
*
it
=
ret
+
step
;
if
(!(
pc
<
(
*
it
)
->
start_pos
)) {
ret
=
it
+
1
;
count
-=
step
+
1
;
}
else
{
count
=
step
; }
}
--
ret
;
/* check returning file exists inside debug info */
mrb_assert
(
info
->
files
<=
ret
&&
ret
<
(
info
->
files
+
info
->
flen
));
/* check pc is within the range of returning file */
mrb_assert
((
*
ret
)
->
start_pos
<=
pc
&&
pc
<
(((
ret
+
1
-
info
->
files
)
<
info
->
flen
)
? (
*
(
ret
+
1
))
->
start_pos
:
info
->
pc_count
));
return
*
ret
;
}
static
mrb_debug_line_type
select_line_type
(
const
uint16_t
*
lines
,
size_t
lines_len
)
{
size_t
line_count
=
0
;
int
prev_line
=
-1
;
size_t
i
;
for
(
i
=
0
;
i
<
lines_len
;
++
i
) {
if
(
lines
[
i
]
!=
prev_line
) {
++
line_count
;
}
}
return
(
sizeof
(
uint16_t
)
*
lines_len
) <= (
sizeof
(
mrb_irep_debug_info_line
)
*
line_count
)
?
mrb_debug_line_ary
:
mrb_debug_line_flat_map
;
}
MRB_API
char
const
*
mrb_debug_get_filename
(
mrb_state
*
mrb
,
mrb_irep
*
irep
,
ptrdiff_t
pc
)
{
if
(
irep
&&
pc
>=
0
&&
pc
<
irep
->
ilen
) {
mrb_irep_debug_info_file
*
f
=
NULL
;
if
(!
irep
->
debug_info
)
return
NULL
;
else
if
((
f
=
get_file
(
irep
->
debug_info
, (
uint32_t
)
pc
))) {
return
mrb_sym_name_len
(
mrb
,
f
->
filename_sym
,
NULL
);
}
}
return
NULL
;
}
MRB_API
int32_t
mrb_debug_get_line
(
mrb_state
*
mrb
,
mrb_irep
*
irep
,
ptrdiff_t
pc
)
{
if
(
irep
&&
pc
>=
0
&&
pc
<
irep
->
ilen
) {
mrb_irep_debug_info_file
*
f
=
NULL
;
if
(!
irep
->
debug_info
) {
return
-1
;
}
else
if
((
f
=
get_file
(
irep
->
debug_info
, (
uint32_t
)
pc
))) {
switch
(
f
->
line_type
) {
case
mrb_debug_line_ary
:
mrb_assert
(
f
->
start_pos
<=
pc
&&
pc
<
(
f
->
start_pos
+
f
->
line_entry_count
));
return
f
->
lines
.
ary
[
pc
-
f
->
start_pos
];
case
mrb_debug_line_flat_map
: {
/* get upper bound */
mrb_irep_debug_info_line
*
ret
=
f
->
lines
.
flat_map
;
uint32_t
count
=
f
->
line_entry_count
;
while
(
count
>
0
) {
int32_t
step
=
count
/
2
;
mrb_irep_debug_info_line
*
it
=
ret
+
step
;
if
(!(
pc
<
it
->
start_pos
)) {
ret
=
it
+
1
;
count
-=
step
+
1
;
}
else
{
count
=
step
; }
}
--
ret
;
/* check line entry pointer range */
mrb_assert
(
f
->
lines
.
flat_map
<=
ret
&&
ret
<
(
f
->
lines
.
flat_map
+
f
->
line_entry_count
));
/* check pc range */
mrb_assert
(
ret
->
start_pos
<=
pc
&&
pc
<
(((
uint32_t
)(
ret
+
1
-
f
->
lines
.
flat_map
)
<
f
->
line_entry_count
)
? (
ret
+
1
)
->
start_pos
:
irep
->
debug_info
->
pc_count
));
return
ret
->
line
;
}
}
}
}
return
-1
;
}
MRB_API
mrb_irep_debug_info
*
mrb_debug_info_alloc
(
mrb_state
*
mrb
,
mrb_irep
*
irep
)
{
static
const
mrb_irep_debug_info
initial
=
{
0
,
0
,
NULL
};
mrb_irep_debug_info
*
ret
;
mrb_assert
(!
irep
->
debug_info
);
ret
=
(
mrb_irep_debug_info
*
)
mrb_malloc
(
mrb
,
sizeof
(
*
ret
));
*
ret
=
initial
;
irep
->
debug_info
=
ret
;
return
ret
;
}
MRB_API
mrb_irep_debug_info_file
*
mrb_debug_info_append_file
(
mrb_state
*
mrb
,
mrb_irep_debug_info
*
d
,
const
char
*
filename
,
uint16_t
*
lines
,
uint32_t
start_pos
,
uint32_t
end_pos
)
{
mrb_irep_debug_info_file
*
f
;
uint32_t
file_pc_count
;
size_t
fn_len
;
uint32_t
i
;
if
(!
d
)
return
NULL
;
if
(
start_pos
==
end_pos
)
return
NULL
;
mrb_assert
(
filename
);
mrb_assert
(
lines
);
if
(
d
->
flen
>
0
) {
const
char
*
fn
=
mrb_sym_name_len
(
mrb
,
d
->
files
[
d
->
flen
-
1
]
->
filename_sym
,
NULL
);
if
(
strcmp
(
filename
,
fn
)
==
0
)
return
NULL
;
}
f
=
(
mrb_irep_debug_info_file
*
)
mrb_malloc
(
mrb
,
sizeof
(
*
f
));
d
->
files
=
(
mrb_irep_debug_info_file
*
*
)(
d
->
files
?
mrb_realloc
(
mrb
,
d
->
files
,
sizeof
(
mrb_irep_debug_info_file
*
)
*
(
d
->
flen
+
1
))
:
mrb_malloc
(
mrb
,
sizeof
(
mrb_irep_debug_info_file
*
)));
d
->
files
[
d
->
flen
++
]
=
f
;
file_pc_count
=
end_pos
-
start_pos
;
f
->
start_pos
=
start_pos
;
d
->
pc_count
=
end_pos
;
fn_len
=
strlen
(
filename
);
f
->
filename_sym
=
mrb_intern
(
mrb
,
filename
,
fn_len
);
f
->
line_type
=
select_line_type
(
lines
+
start_pos
,
end_pos
-
start_pos
);
f
->
lines
.
ptr
=
NULL
;
switch
(
f
->
line_type
) {
case
mrb_debug_line_ary
:
f
->
line_entry_count
=
file_pc_count
;
f
->
lines
.
ary
=
(
uint16_t
*
)
mrb_malloc
(
mrb
,
sizeof
(
uint16_t
)
*
file_pc_count
);
for
(
i
=
0
;
i
<
file_pc_count
;
++
i
) {
f
->
lines
.
ary
[
i
]
=
lines
[
start_pos
+
i
];
}
break
;
case
mrb_debug_line_flat_map
: {
uint16_t
prev_line
=
0
;
mrb_irep_debug_info_line
m
;
f
->
lines
.
flat_map
=
(
mrb_irep_debug_info_line
*
)
mrb_malloc
(
mrb
,
sizeof
(
mrb_irep_debug_info_line
)
*
1
);
f
->
line_entry_count
=
0
;
for
(
i
=
0
;
i
<
file_pc_count
;
++
i
) {
if
(
lines
[
start_pos
+
i
]
==
prev_line
) {
continue
; }
f
->
lines
.
flat_map
=
(
mrb_irep_debug_info_line
*
)
mrb_realloc
(
mrb
,
f
->
lines
.
flat_map
,
sizeof
(
mrb_irep_debug_info_line
)
*
(
f
->
line_entry_count
+
1
));
m
.
start_pos
=
start_pos
+
i
;
m
.
line
=
lines
[
start_pos
+
i
];
f
->
lines
.
flat_map
[
f
->
line_entry_count
]
=
m
;
/* update */
++
f
->
line_entry_count
;
prev_line
=
lines
[
start_pos
+
i
];
}
}
break
;
default
:
mrb_assert
(
0
);
break
;
}
return
f
;
}
MRB_API
void
mrb_debug_info_free
(
mrb_state
*
mrb
,
mrb_irep_debug_info
*
d
)
{
uint32_t
i
;
if
(!
d
) {
return
; }
for
(
i
=
0
;
i
<
d
->
flen
;
++
i
) {
mrb_assert
(
d
->
files
[
i
]);
mrb_free
(
mrb
,
d
->
files
[
i
]
->
lines
.
ptr
);
mrb_free
(
mrb
,
d
->
files
[
i
]);
}
mrb_free
(
mrb
,
d
->
files
);
mrb_free
(
mrb
,
d
);
}
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