1. DTrace Release Notes
  2. DTrace Changelog
  3. 2.0.0-1.10 (Apr 26th, 2022)

2.0.0-1.10 (Apr 26th, 2022)

Tenth errata of the standalone userspace implementation.

This is a pre-release with limited functionality.

New features:

  • The trace() action supports array, struct, and union values.

  • The execname built-in variables is now implemented.

  • The inet_ntoa() subroutine has been implemented.

  • The progenyof() subroutine has been implemented.

  • The getmajor() and getminor() subroutines have been implemented.

  • The mutex_owned(), mutex_owner(), mutex_type_adaptive(), mutex_type_spin(), rw_read_held(), rw_write_held(), and rw_iswriter() have been implemented.

  • The alloca() and bcopy() subroutines have been implemented.

  • Associative arrays have been implemented. They are supported for both global and TLS variables.

  • Disassembler annotations have been added for associative arrays, register spills, and string constants.

  • The translators have been updated to support up to kernel series 5.16.

  • Faults will now report the PC (program counter) where the fault is reported.

Bugfixes:

  • Register allocation leaks were fixed.

  • NULL pointer verification has been optimized to avoid checking the same pointer more than once.

  • NULL pointers handling in ternary conditionals are now supported.

  • Casting of pointers to integers has been fixed.

  • Negative (immediate) values in signed conditionals are now printed correctly.

  • Disassembler annotations for TLS variables have been corrected.

  • The DIFO strtab handling has been reworked to fix multiple bugs.

Internal changes:

  • The strlen() subroutine is now implemented using the bpf_probe_read_str() BPF helper.

  • Strings are no longer stored using a length prefix.

  • BPF functions that are implemented in C or assembly code are no longer statically listed in the DTrace source code. Their existence is determined at runtime when the dlibs are loaded.

  • All load-time constants are now handled by the relocation mechanism.

  • New function dt_dis_insn() can be used by developers to disassemble a single instruction..

  • The implementation of pre and post arithmetic has been optimized.

  • Relocation support for the 'add immediate' instructions has been added.

  • The substr() subroutine has been optimized to reduce register pressure.

Testsuite changes:

  • Various tests have been moved from XFAIL to PASS status in response to the implementation of new features and in view of some bug fixes.

  • Various tests were improved.