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dart-sdk/pkg/native_stack_traces/CHANGELOG.md
Tess Strickland 3e40abbc09 [vm/aot] Reland "Keep column information when possible for precompiled mode." 
Changes:

Doing this always in precompiled mode meant increased data segment sizes
when CodeSourceMaps are stored, since encoded line/column information is
larger in the LEB-like encoding used. Now we only store column
information when we produce non-symbolic stacks, since the increased
space needed to store the columns is instead in DWARF sections and can
be stripped or elided.

Original description:

Previously, we passed line number information to the stack trace printer
and to DWARF by changing the non-special positions in the CodeSourceMap
to line numbers in precompiled mode. However, doing this lost column
information.

We get the column information back in the majority of cases by encoding
the line number and column information when neither is too large to pack
together into 30 bits. (Here, 20 bits for line and 10 bits for column.)
Otherwise, we just store the line information as before, though due to
using a bit to encode whether column info exists, it's reduced to 30
bits. If the line info is too big for that, we just return kNoSourcePos.

Cq-Include-Trybots: luci.dart.try:vm-kernel-precomp-nnbd-linux-release-x64-try,vm-kernel-precomp-linux-release-x64-try,vm-kernel-precomp-linux-product-x64-try,vm-kernel-precomp-linux-debug-x64-try,vm-kernel-precomp-linux-release-simarm_x64-try
Change-Id: Ia8baee71468da6100a170fa305d03059ffd17f78
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/151822
Commit-Queue: Tess Strickland <sstrickl@google.com>
Reviewed-by: Martin Kustermann <kustermann@google.com>
2020-06-19 13:50:03 +00:00

1.9 KiB
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Changelog

0.3.8

  • Support columns when present in line number programs.

0.3.7

  • Added buildId accessor for retrieving GNU build IDs from DWARF files that include them.

0.3.6

  • Adjusts RegExp for stack trace header line to be more flexible in what it permits to allow additional information to be added in the Dart VM.

0.3.5

  • Use virtual addresses in non-symbolic stack frames as a fallback if we cannot retrieve an appropriate offset from the instructions section otherwise.

0.3.4

  • Decoded Dart calls are now never considered internal, only VM stub calls. This is due to a concurrent change in the Dart VM that no longer prints non-symbolic frames for functions considered invisible, which matches the symbolic frame printer and removes the need for the decoder to guess which frames should be hidden.

    This package still works on earlier versions of Dart, so the dependencies have not changed. However, it may print more frame information than expected when decoding stack frames from a Dart VM that does not include this change to non-symbolic stack printing.

0.3.3

  • No externally visible changes.

0.3.2

  • The find command can now look up addresses given as offsets from static symbols, not just hexadecimal virtual or absolute addresses.
  • Integer inputs (addresses or offsets) without an '0x' prefix or hexadecimal digits will now be parsed as decimal unless the -x/--force_hexadecimal flag is used.

0.3.1

  • Uses dynamic symbol information embedded in stack frame lines when available.

0.3.0

  • Adds handling of virtual addresses within stub code payloads.

0.2.2

  • Finds instruction sections by the dynamic symbols the Dart VM creates instead of assuming there are two text sections.

0.2.1

  • Added static method Dwarf.fromBuffer.

0.2.0

  • API and documentation cleanups

0.1.0

  • Initial release