d7053ea9c7
* Upgrade to the latest versions of gimli, addr2line, object And adapt to API changes. New gimli supports wasm dwarf, resulting in some simplifications in the debug crate. * upgrade gimli usage in linux-specific profiling too * Add "continue" statement after interpreting a wasm local dwarf opcode
676 lines
25 KiB
Rust
676 lines
25 KiB
Rust
//! Support for jitdump files which can be used by perf for profiling jitted code.
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//! Spec definitions for the output format is as described here:
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//! <https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/tools/perf/Documentation/jitdump-specification.txt>
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//!
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//! Usage Example:
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//! Record
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//! sudo perf record -k 1 -e instructions:u target/debug/wasmtime -g --jitdump test.wasm
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//! Combine
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//! sudo perf inject -v -j -i perf.data -o perf.jit.data
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//! Report
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//! sudo perf report -i perf.jit.data -F+period,srcline
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//! Note: For descriptive results, the WASM file being executed should contain dwarf debug data
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use crate::ProfilingAgent;
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use anyhow::Result;
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use object::{Object, ObjectSection};
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use scroll::{IOwrite, SizeWith, NATIVE};
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use serde::{Deserialize, Serialize};
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use std::fmt::Debug;
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use std::fs::{File, OpenOptions};
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use std::io;
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use std::io::Write;
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use std::os::unix::prelude::*;
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use std::ptr;
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use std::sync::Mutex;
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use std::{borrow, mem, process};
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use target_lexicon::Architecture;
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use wasmtime_environ::entity::PrimaryMap;
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use wasmtime_environ::wasm::DefinedFuncIndex;
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use wasmtime_environ::Module;
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use wasmtime_runtime::VMFunctionBody;
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use object::elf;
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/// Defines jitdump record types
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#[repr(u32)]
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pub enum RecordId {
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/// Value 0: JIT_CODE_LOAD: record describing a jitted function
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JitCodeLoad = 0,
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/// Value 1: JIT_CODE_MOVE: record describing an already jitted function which is moved
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_JitCodeMove = 1,
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/// Value 2: JIT_CODE_DEBUG_INFO: record describing the debug information for a jitted function
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JitCodeDebugInfo = 2,
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/// Value 3: JIT_CODE_CLOSE: record marking the end of the jit runtime (optional)
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_JitCodeClose = 3,
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/// Value 4: JIT_CODE_UNWINDING_INFO: record describing a function unwinding information
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_JitCodeUnwindingInfo = 4,
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}
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/// Each record starts with this fixed size record header which describes the record that follows
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#[derive(Serialize, Deserialize, Debug, Default, Clone, Copy, IOwrite, SizeWith)]
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#[repr(C)]
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pub struct RecordHeader {
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/// uint32_t id: a value identifying the record type (see below)
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id: u32,
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/// uint32_t total_size: the size in bytes of the record including the header.
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record_size: u32,
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/// uint64_t timestamp: a timestamp of when the record was created.
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timestamp: u64,
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}
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/// The CodeLoadRecord is used for describing jitted functions
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#[derive(Serialize, Deserialize, Debug, Default, Clone, Copy, IOwrite, SizeWith)]
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#[repr(C)]
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pub struct CodeLoadRecord {
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/// Fixed sized header that describes this record
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header: RecordHeader,
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/// uint32_t pid: OS process id of the runtime generating the jitted code
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pid: u32,
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/// uint32_t tid: OS thread identification of the runtime thread generating the jitted code
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tid: u32,
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/// uint64_t vma: virtual address of jitted code start
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virtual_address: u64,
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/// uint64_t code_addr: code start address for the jitted code. By default vma = code_addr
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address: u64,
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/// uint64_t code_size: size in bytes of the generated jitted code
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size: u64,
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/// uint64_t code_index: unique identifier for the jitted code (see below)
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index: u64,
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}
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/// Describes source line information for a jitted function
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#[derive(Serialize, Deserialize, Debug, Default)]
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#[repr(C)]
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pub struct DebugEntry {
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/// uint64_t code_addr: address of function for which the debug information is generated
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address: u64,
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/// uint32_t line: source file line number (starting at 1)
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line: u32,
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/// uint32_t discrim: column discriminator, 0 is default
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discriminator: u32,
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/// char name[n]: source file name in ASCII, including null termination
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filename: String,
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}
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/// Describes debug information for a jitted function. An array of debug entries are
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/// appended to this record during writting. Note, this record must preceed the code
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/// load record that describes the same jitted function.
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#[derive(Serialize, Deserialize, Debug, Default, Clone, Copy, IOwrite, SizeWith)]
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#[repr(C)]
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pub struct DebugInfoRecord {
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/// Fixed sized header that describes this record
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header: RecordHeader,
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/// uint64_t code_addr: address of function for which the debug information is generated
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address: u64,
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/// uint64_t nr_entry: number of debug entries for the function appended to this record
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count: u64,
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}
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/// Fixed-sized header for each jitdump file
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#[derive(Serialize, Deserialize, Debug, Default, IOwrite, SizeWith)]
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#[repr(C)]
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pub struct FileHeader {
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/// uint32_t magic: a magic number tagging the file type. The value is 4-byte long and represents the
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/// string "JiTD" in ASCII form. It is 0x4A695444 or 0x4454694a depending on the endianness. The field can
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/// be used to detect the endianness of the file
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magic: u32,
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/// uint32_t version: a 4-byte value representing the format version. It is currently set to 2
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version: u32,
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/// uint32_t total_size: size in bytes of file header
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size: u32,
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/// uint32_t elf_mach: ELF architecture encoding (ELF e_machine value as specified in /usr/include/elf.h)
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e_machine: u32,
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/// uint32_t pad1: padding. Reserved for future use
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pad1: u32,
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/// uint32_t pid: JIT runtime process identification (OS specific)
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pid: u32,
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/// uint64_t timestamp: timestamp of when the file was created
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timestamp: u64,
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/// uint64_t flags: a bitmask of flags
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flags: u64,
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}
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/// Interface for driving the creation of jitdump files
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pub struct JitDumpAgent {
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// Note that we use a mutex internally to serialize writing out to our
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// `jitdump_file` within this process, since multiple threads may be sharing
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// this jit agent.
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state: Mutex<State>,
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}
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struct State {
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/// File instance for the jit dump file
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jitdump_file: File,
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map_addr: usize,
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/// Unique identifier for jitted code
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code_index: u64,
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/// Flag for experimenting with dumping code load record
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/// after each function (true) or after each module. This
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/// flag is currently set to true.
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dump_funcs: bool,
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}
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impl JitDumpAgent {
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/// Intialize a JitDumpAgent and write out the header
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pub fn new() -> Result<Self> {
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let filename = format!("./jit-{}.dump", process::id());
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let jitdump_file = OpenOptions::new()
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.read(true)
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.write(true)
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.create(true)
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.truncate(true)
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.open(&filename)?;
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// After we make our `*.dump` file we execute an `mmap` syscall,
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// specifically with executable permissions, to map it into our address
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// space. This is required so `perf inject` will work later. The `perf
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// inject` command will see that an mmap syscall happened, and it'll see
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// the filename we mapped, and that'll trigger it to actually read and
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// parse the file.
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//
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// To match what some perf examples are doing we keep this `mmap` alive
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// until this agent goes away.
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let map_addr = unsafe {
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let ptr = libc::mmap(
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ptr::null_mut(),
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libc::sysconf(libc::_SC_PAGESIZE) as usize,
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libc::PROT_EXEC | libc::PROT_READ,
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libc::MAP_PRIVATE,
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jitdump_file.as_raw_fd(),
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0,
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);
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if ptr == libc::MAP_FAILED {
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return Err(io::Error::last_os_error().into());
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}
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ptr as usize
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};
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let mut state = State {
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jitdump_file,
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map_addr,
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code_index: 0,
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dump_funcs: true,
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};
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state.write_file_header()?;
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Ok(JitDumpAgent {
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state: Mutex::new(state),
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})
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}
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}
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impl ProfilingAgent for JitDumpAgent {
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fn module_load(
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&self,
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module: &Module,
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functions: &PrimaryMap<DefinedFuncIndex, *mut [VMFunctionBody]>,
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dbg_image: Option<&[u8]>,
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) {
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self.state
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.lock()
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.unwrap()
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.module_load(module, functions, dbg_image);
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}
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}
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impl State {
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/// Returns timestamp from a single source
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fn get_time_stamp(&self) -> u64 {
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// We need to use `CLOCK_MONOTONIC` on Linux which is what `Instant`
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// conveniently also uses, but `Instant` doesn't allow us to get access
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// to nanoseconds as an internal detail, so we calculate the nanoseconds
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// ourselves here.
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unsafe {
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let mut ts = mem::MaybeUninit::zeroed();
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assert_eq!(
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libc::clock_gettime(libc::CLOCK_MONOTONIC, ts.as_mut_ptr()),
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0
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);
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let ts = ts.assume_init();
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// TODO: What does it mean for either sec or nsec to be negative?
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(ts.tv_sec * 1_000_000_000 + ts.tv_nsec) as u64
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}
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}
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/// Returns the ELF machine architecture.
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fn get_e_machine(&self) -> u32 {
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match target_lexicon::HOST.architecture {
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Architecture::X86_64 => elf::EM_X86_64 as u32,
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Architecture::X86_32(_) => elf::EM_386 as u32,
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Architecture::Arm(_) => elf::EM_ARM as u32,
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Architecture::Aarch64(_) => elf::EM_AARCH64 as u32,
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Architecture::S390x => elf::EM_S390 as u32,
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_ => unimplemented!("unrecognized architecture"),
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}
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}
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fn write_file_header(&mut self) -> Result<()> {
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let header = FileHeader {
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timestamp: self.get_time_stamp(),
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e_machine: self.get_e_machine(),
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magic: 0x4A695444,
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version: 1,
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size: mem::size_of::<FileHeader>() as u32,
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pad1: 0,
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pid: process::id(),
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flags: 0,
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};
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self.jitdump_file.iowrite_with(header, NATIVE)?;
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Ok(())
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}
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fn write_code_load_record(
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&mut self,
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record_name: &str,
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cl_record: CodeLoadRecord,
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code_buffer: &[u8],
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) -> Result<()> {
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self.jitdump_file.iowrite_with(cl_record, NATIVE)?;
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self.jitdump_file.write_all(record_name.as_bytes())?;
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self.jitdump_file.write_all(b"\0")?;
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self.jitdump_file.write_all(code_buffer)?;
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Ok(())
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}
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/// Write DebugInfoRecord to open jit dump file.
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/// Must be written before the corresponding CodeLoadRecord.
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fn write_debug_info_record(&mut self, dir_record: DebugInfoRecord) -> Result<()> {
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self.jitdump_file.iowrite_with(dir_record, NATIVE)?;
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Ok(())
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}
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/// Write DebugInfoRecord to open jit dump file.
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/// Must be written before the corresponding CodeLoadRecord.
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fn write_debug_info_entries(&mut self, die_entries: Vec<DebugEntry>) -> Result<()> {
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for entry in die_entries.iter() {
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self.jitdump_file.iowrite_with(entry.address, NATIVE)?;
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self.jitdump_file.iowrite_with(entry.line, NATIVE)?;
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self.jitdump_file
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.iowrite_with(entry.discriminator, NATIVE)?;
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self.jitdump_file.write_all(entry.filename.as_bytes())?;
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self.jitdump_file.write_all(b"\0")?;
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}
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Ok(())
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}
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/// Sent when a method is compiled and loaded into memory by the VM.
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pub fn module_load(
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&mut self,
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module: &Module,
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functions: &PrimaryMap<DefinedFuncIndex, *mut [VMFunctionBody]>,
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dbg_image: Option<&[u8]>,
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) -> () {
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let pid = process::id();
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let tid = pid; // ThreadId does appear to track underlying thread. Using PID.
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for (idx, func) in functions.iter() {
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let (addr, len) = unsafe { ((**func).as_ptr() as *const u8, (**func).len()) };
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if let Some(img) = &dbg_image {
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if let Err(err) = self.dump_from_debug_image(img, "wasm", addr, len, pid, tid) {
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println!(
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"Jitdump: module_load failed dumping from debug image: {:?}\n",
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err
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);
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}
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} else {
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let timestamp = self.get_time_stamp();
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let name = super::debug_name(module, idx);
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self.dump_code_load_record(&name, addr, len, timestamp, pid, tid);
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}
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}
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}
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fn dump_code_load_record(
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&mut self,
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method_name: &str,
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addr: *const u8,
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len: usize,
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timestamp: u64,
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pid: u32,
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tid: u32,
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) -> () {
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let name_len = method_name.len() + 1;
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let size_limit = mem::size_of::<CodeLoadRecord>();
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let rh = RecordHeader {
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id: RecordId::JitCodeLoad as u32,
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record_size: size_limit as u32 + name_len as u32 + len as u32,
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timestamp: timestamp,
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};
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let clr = CodeLoadRecord {
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header: rh,
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pid: pid,
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tid: tid,
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virtual_address: addr as u64,
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address: addr as u64,
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size: len as u64,
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index: self.code_index,
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};
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self.code_index += 1;
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unsafe {
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let code_buffer: &[u8] = std::slice::from_raw_parts(addr, len);
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if let Err(err) = self.write_code_load_record(method_name, clr, code_buffer) {
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println!("Jitdump: write_code_load_failed_record failed: {:?}\n", err);
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}
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}
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}
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/// Attempts to dump debuginfo data structures, adding method and line level
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/// for the jitted function.
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pub fn dump_from_debug_image(
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&mut self,
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dbg_image: &[u8],
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module_name: &str,
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addr: *const u8,
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len: usize,
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pid: u32,
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tid: u32,
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) -> Result<()> {
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let file = object::File::parse(dbg_image).unwrap();
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let endian = if file.is_little_endian() {
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gimli::RunTimeEndian::Little
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} else {
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gimli::RunTimeEndian::Big
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};
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let load_section = |id: gimli::SectionId| -> Result<borrow::Cow<[u8]>> {
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if let Some(section) = file.section_by_name(id.name()) {
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Ok(section.data()?.into())
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} else {
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Ok((&[] as &[u8]).into())
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}
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};
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let dwarf_cow = gimli::Dwarf::load(&load_section)?;
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let borrow_section: &dyn for<'a> Fn(
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&'a borrow::Cow<[u8]>,
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)
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-> gimli::EndianSlice<'a, gimli::RunTimeEndian> =
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&|section| gimli::EndianSlice::new(&*section, endian);
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let dwarf = dwarf_cow.borrow(&borrow_section);
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let mut iter = dwarf.units();
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while let Some(header) = iter.next()? {
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let unit = match dwarf.unit(header) {
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Ok(unit) => unit,
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Err(_err) => {
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return Ok(());
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}
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};
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self.dump_entries(unit, &dwarf, module_name, addr, len, pid, tid)?;
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// TODO: Temp exit to avoid duplicate addresses being covered by only
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// processing the top unit
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break;
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}
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if !self.dump_funcs {
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let timestamp = self.get_time_stamp();
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self.dump_code_load_record(module_name, addr, len, timestamp, pid, tid);
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}
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Ok(())
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}
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fn dump_entries<R: Reader>(
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&mut self,
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unit: gimli::Unit<R>,
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dwarf: &gimli::Dwarf<R>,
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module_name: &str,
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addr: *const u8,
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len: usize,
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pid: u32,
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tid: u32,
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) -> Result<()> {
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let mut depth = 0;
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let mut entries = unit.entries();
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while let Some((delta_depth, entry)) = entries.next_dfs()? {
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if self.dump_funcs {
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let record_header = RecordHeader {
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id: RecordId::JitCodeLoad as u32,
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record_size: 0,
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timestamp: 0,
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};
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let mut clr = CodeLoadRecord {
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header: record_header,
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pid: pid,
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tid: tid,
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virtual_address: 0,
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address: 0,
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size: 0,
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index: 0,
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};
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let mut clr_name: String = String::from(module_name);
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let mut get_debug_entry = false;
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depth += delta_depth;
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assert!(depth >= 0);
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if entry.tag() == gimli::constants::DW_TAG_subprogram {
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get_debug_entry = true;
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let mut attrs = entry.attrs();
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while let Some(attr) = attrs.next()? {
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if let Some(n) = attr.name().static_string() {
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if n == "DW_AT_low_pc" {
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clr.address = match attr.value() {
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gimli::AttributeValue::Addr(address) => address,
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_ => 0,
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};
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clr.virtual_address = clr.address;
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} else if n == "DW_AT_high_pc" {
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clr.size = match attr.value() {
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gimli::AttributeValue::Udata(data) => data,
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_ => 0,
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};
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} else if n == "DW_AT_name" {
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clr_name = match attr.value() {
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gimli::AttributeValue::DebugStrRef(offset) => {
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if let Ok(s) = dwarf.debug_str.get_str(offset) {
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clr_name.push_str("::");
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clr_name.push_str(&s.to_string_lossy()?);
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clr_name
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} else {
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clr_name.push_str("::");
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clr_name.push_str("?");
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clr_name
|
|
}
|
|
}
|
|
_ => {
|
|
clr_name.push_str("??");
|
|
clr_name
|
|
}
|
|
};
|
|
}
|
|
}
|
|
}
|
|
}
|
|
if get_debug_entry {
|
|
// TODO: Temp check to make sure well only formed data is processed.
|
|
if clr.address == 0 {
|
|
continue;
|
|
}
|
|
// TODO: Temp check to make sure well only formed data is processed.
|
|
if clr_name == "?" {
|
|
continue;
|
|
}
|
|
if clr.address == 0 || clr.size == 0 {
|
|
clr.address = addr as u64;
|
|
clr.virtual_address = addr as u64;
|
|
clr.size = len as u64;
|
|
}
|
|
clr.header.record_size = mem::size_of::<CodeLoadRecord>() as u32
|
|
+ (clr_name.len() + 1) as u32
|
|
+ clr.size as u32;
|
|
clr.index = self.code_index;
|
|
self.code_index += 1;
|
|
self.dump_debug_info(&unit, &dwarf, clr.address, clr.size, None)?;
|
|
|
|
clr.header.timestamp = self.get_time_stamp();
|
|
|
|
unsafe {
|
|
let code_buffer: &[u8] =
|
|
std::slice::from_raw_parts(clr.address as *const u8, clr.size as usize);
|
|
let _ = self.write_code_load_record(&clr_name, clr, code_buffer);
|
|
}
|
|
}
|
|
} else {
|
|
let mut func_name: String = String::from("?");
|
|
let mut func_addr = 0;
|
|
let mut func_size = 0;
|
|
|
|
let mut get_debug_entry = false;
|
|
depth += delta_depth;
|
|
assert!(depth >= 0);
|
|
if entry.tag() == gimli::constants::DW_TAG_subprogram {
|
|
get_debug_entry = true;
|
|
|
|
let mut attrs = entry.attrs();
|
|
while let Some(attr) = attrs.next()? {
|
|
if let Some(n) = attr.name().static_string() {
|
|
if n == "DW_AT_low_pc" {
|
|
func_addr = match attr.value() {
|
|
gimli::AttributeValue::Addr(address) => address,
|
|
_ => 0,
|
|
};
|
|
} else if n == "DW_AT_high_pc" {
|
|
func_size = match attr.value() {
|
|
gimli::AttributeValue::Udata(data) => data,
|
|
_ => 0,
|
|
};
|
|
} else if n == "DW_AT_name" {
|
|
func_name = match attr.value() {
|
|
gimli::AttributeValue::DebugStrRef(offset) => {
|
|
if let Ok(s) = dwarf.debug_str.get_str(offset) {
|
|
func_name.clear();
|
|
func_name.push_str(&s.to_string_lossy()?);
|
|
func_name
|
|
} else {
|
|
func_name.push_str("?");
|
|
func_name
|
|
}
|
|
}
|
|
_ => {
|
|
func_name.push_str("??");
|
|
func_name
|
|
}
|
|
};
|
|
}
|
|
}
|
|
}
|
|
}
|
|
if get_debug_entry {
|
|
// TODO: Temp check to make sure well only formed data is processed.
|
|
if func_addr == 0 {
|
|
continue;
|
|
}
|
|
// TODO: Temp check to make sure well only formed data is processed.
|
|
if func_name == "?" {
|
|
continue;
|
|
}
|
|
self.dump_debug_info(
|
|
&unit,
|
|
&dwarf,
|
|
func_addr,
|
|
func_size,
|
|
Some(func_name.as_str()),
|
|
)?;
|
|
}
|
|
}
|
|
}
|
|
Ok(())
|
|
}
|
|
|
|
fn dump_debug_info<R: Reader>(
|
|
&mut self,
|
|
unit: &gimli::Unit<R>,
|
|
dwarf: &gimli::Dwarf<R>,
|
|
address: u64,
|
|
size: u64,
|
|
file_suffix: Option<&str>,
|
|
) -> Result<()> {
|
|
let timestamp = self.get_time_stamp();
|
|
if let Some(program) = unit.line_program.clone() {
|
|
let mut debug_info_record = DebugInfoRecord {
|
|
header: RecordHeader {
|
|
id: RecordId::JitCodeDebugInfo as u32,
|
|
record_size: 0,
|
|
timestamp,
|
|
},
|
|
address,
|
|
count: 0,
|
|
};
|
|
|
|
let mut debug_entries = Vec::new();
|
|
let mut debug_entries_total_filenames_len = 0;
|
|
let mut rows = program.rows();
|
|
while let Some((header, row)) = rows.next_row()? {
|
|
let row_file_index = row.file_index() - 1;
|
|
let myfile = dwarf
|
|
.attr_string(
|
|
&unit,
|
|
header.file_names()[row_file_index as usize].path_name(),
|
|
)
|
|
.unwrap();
|
|
let filename = myfile.to_string_lossy()?;
|
|
let line = row.line().map(|nonzero| nonzero.get()).unwrap_or(0);
|
|
let column = match row.column() {
|
|
gimli::ColumnType::Column(column) => column.get(),
|
|
gimli::ColumnType::LeftEdge => 0,
|
|
};
|
|
|
|
if (row.address() < address) || (row.address() > (address + size)) {
|
|
continue;
|
|
}
|
|
let mut debug_entry = DebugEntry {
|
|
address: row.address(),
|
|
line: line as u32,
|
|
discriminator: column as u32,
|
|
filename: filename.to_string(),
|
|
};
|
|
|
|
if let Some(suffix) = file_suffix {
|
|
debug_entry.filename.push_str("::");
|
|
debug_entry.filename.push_str(suffix);
|
|
}
|
|
|
|
debug_entries_total_filenames_len += debug_entry.filename.len() + 1;
|
|
debug_entries.push(debug_entry);
|
|
}
|
|
|
|
debug_info_record.count = debug_entries.len() as u64;
|
|
|
|
let debug_entries_size = (debug_info_record.count
|
|
* (mem::size_of::<DebugEntry>() as u64 - mem::size_of::<String>() as u64))
|
|
+ debug_entries_total_filenames_len as u64;
|
|
debug_info_record.header.record_size =
|
|
mem::size_of::<DebugInfoRecord>() as u32 + debug_entries_size as u32;
|
|
|
|
let _ = self.write_debug_info_record(debug_info_record);
|
|
let _ = self.write_debug_info_entries(debug_entries);
|
|
}
|
|
Ok(())
|
|
}
|
|
}
|
|
|
|
impl Drop for State {
|
|
fn drop(&mut self) {
|
|
unsafe {
|
|
libc::munmap(
|
|
self.map_addr as *mut _,
|
|
libc::sysconf(libc::_SC_PAGESIZE) as usize,
|
|
);
|
|
}
|
|
}
|
|
}
|
|
|
|
trait Reader: gimli::Reader<Offset = usize> + Send + Sync {}
|
|
|
|
impl<'input, Endian> Reader for gimli::EndianSlice<'input, Endian> where
|
|
Endian: gimli::Endianity + Send + Sync
|
|
{
|
|
}
|