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use crate::{AttrFlags, BranchSampleFormat, Endianness, PerfEventAttr, ReadFormat, SampleFormat};
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub struct RecordParseInfo {
pub endian: Endianness,
pub sample_format: SampleFormat,
pub branch_sample_format: BranchSampleFormat,
pub read_format: ReadFormat,
pub common_data_offset_from_end: Option<u8>, // 0..=48
pub sample_regs_user: u64,
pub regs_count: u8, // 0..=64
pub id_parse_info: RecordIdParseInfo,
pub nonsample_record_time_offset_from_end: Option<u8>, // 0..=40
pub sample_record_time_offset_from_start: Option<u8>, // 0..=32
}
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub struct RecordIdParseInfo {
pub nonsample_record_id_offset_from_end: Option<u8>, // 0..=32
pub sample_record_id_offset_from_start: Option<u8>, // 0..=24
}
impl RecordParseInfo {
pub fn new(attr: &PerfEventAttr, endian: Endianness) -> Self {
let sample_format = attr.sample_format;
let branch_sample_format = attr.branch_sample_format;
let read_format = attr.read_format;
// struct sample_id {
// { u32 pid, tid; } /* if PERF_SAMPLE_TID set */
// { u64 time; } /* if PERF_SAMPLE_TIME set */
// { u64 id; } /* if PERF_SAMPLE_ID set */
// { u64 stream_id;} /* if PERF_SAMPLE_STREAM_ID set */
// { u32 cpu, res; } /* if PERF_SAMPLE_CPU set */
// { u64 id; } /* if PERF_SAMPLE_IDENTIFIER set */
// };
let common_data_offset_from_end = if attr.flags.contains(AttrFlags::SAMPLE_ID_ALL) {
Some(
sample_format
.intersection(
SampleFormat::TID
| SampleFormat::TIME
| SampleFormat::ID
| SampleFormat::STREAM_ID
| SampleFormat::CPU
| SampleFormat::IDENTIFIER,
)
.bits()
.count_ones() as u8
* 8,
)
} else {
None
};
let sample_regs_user = attr.sample_regs_user;
let regs_count = sample_regs_user.count_ones() as u8;
let nonsample_record_time_offset_from_end = if attr.flags.contains(AttrFlags::SAMPLE_ID_ALL)
&& sample_format.contains(SampleFormat::TIME)
{
Some(
sample_format
.intersection(
SampleFormat::TIME
| SampleFormat::ID
| SampleFormat::STREAM_ID
| SampleFormat::CPU
| SampleFormat::IDENTIFIER,
)
.bits()
.count_ones() as u8
* 8,
)
} else {
None
};
// { u64 id; } && PERF_SAMPLE_IDENTIFIER
// { u64 ip; } && PERF_SAMPLE_IP
// { u32 pid; u32 tid; } && PERF_SAMPLE_TID
// { u64 time; } && PERF_SAMPLE_TIME
// { u64 addr; } && PERF_SAMPLE_ADDR
// { u64 id; } && PERF_SAMPLE_ID
let sample_record_time_offset_from_start = if sample_format.contains(SampleFormat::TIME) {
Some(
sample_format
.intersection(SampleFormat::IDENTIFIER | SampleFormat::IP | SampleFormat::TID)
.bits()
.count_ones() as u8
* 8,
)
} else {
None
};
Self {
endian,
sample_format,
branch_sample_format,
read_format,
common_data_offset_from_end,
sample_regs_user,
regs_count,
nonsample_record_time_offset_from_end,
sample_record_time_offset_from_start,
id_parse_info: RecordIdParseInfo::new(attr),
}
}
}
impl RecordIdParseInfo {
pub fn new(attr: &PerfEventAttr) -> Self {
let sample_format = attr.sample_format;
let nonsample_record_id_offset_from_end = if attr.flags.contains(AttrFlags::SAMPLE_ID_ALL)
&& sample_format.intersects(SampleFormat::ID | SampleFormat::IDENTIFIER)
{
if sample_format.contains(SampleFormat::IDENTIFIER) {
Some(8)
} else {
Some(
sample_format
.intersection(
SampleFormat::ID
| SampleFormat::STREAM_ID
| SampleFormat::CPU
| SampleFormat::IDENTIFIER,
)
.bits()
.count_ones() as u8
* 8,
)
}
} else {
None
};
// { u64 id; } && PERF_SAMPLE_IDENTIFIER
// { u64 ip; } && PERF_SAMPLE_IP
// { u32 pid; u32 tid; } && PERF_SAMPLE_TID
// { u64 time; } && PERF_SAMPLE_TIME
// { u64 addr; } && PERF_SAMPLE_ADDR
// { u64 id; } && PERF_SAMPLE_ID
let sample_record_id_offset_from_start = if sample_format.contains(SampleFormat::IDENTIFIER)
{
Some(0)
} else if sample_format.contains(SampleFormat::ID) {
Some(
sample_format
.intersection(
SampleFormat::IP
| SampleFormat::TID
| SampleFormat::TIME
| SampleFormat::ADDR,
)
.bits()
.count_ones() as u8
* 8,
)
} else {
None
};
Self {
nonsample_record_id_offset_from_end,
sample_record_id_offset_from_start,
}
}
}