Previously, Code objects of invisible functions were retained
in order to omit frames corresponding to such functions from stack
traces when stack trace is printed.
This change drops Code objects of invisible functions. That also
means that frames corresponding to such functions are no longer
skipped in binary DWARF stack traces.
In order to account for that, DW_AT_artificial attribute is added to
generated DWARF debug information to mark invisible functions.
Stack trace decoding now looks at this attribute and skips those
frames when symbolizing stack trace.
Flutter gallery in release-sizeopt mode:
Heap size of snapshot objects -4.2% (arm), -4.4% (arm64).
A large application in --dwarf_stack_traces mode:
Number of discarded Code objects increased from 72.4% to 83.7%
(out of all Code objects).
Heap size of Code objects -37.4%.
Heap size of all snapshot objects -5%.
TEST=tests/standalone/dwarf_stack_trace_invisible_functions_test.dart
Issue: https://github.com/dart-lang/sdk/issues/44852
Change-Id: Ib804852aba1e083670f1d9b9d66cbaab7dcdcff9
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/196583
Commit-Queue: Alexander Markov <alexmarkov@google.com>
Reviewed-by: Tess Strickland <sstrickl@google.com>
Reviewed-by: Ryan Macnak <rmacnak@google.com>
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>
This reverts commit 7c34a80c11.
Reason for revert: This change seems to cause >2% code size regression
in flutter-release mode.
Original change's description:
> [vm/aot] Keep column information when possible for precompiled mode.
>
> 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: Id1c826f10871e2f304fa40a59d8b704404d3a2c9
> Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/151507
> Commit-Queue: Tess Strickland <sstrickl@google.com>
> Reviewed-by: Ryan Macnak <rmacnak@google.com>
TBR=rmacnak@google.com,alexmarkov@google.com,sstrickl@google.com
Change-Id: I5cf97543d1ac2731bb27bdb58ae97af6f22f2cfb
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
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Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/151820
Reviewed-by: Martin Kustermann <kustermann@google.com>
Commit-Queue: Martin Kustermann <kustermann@google.com>
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: Id1c826f10871e2f304fa40a59d8b704404d3a2c9
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/151507
Commit-Queue: Tess Strickland <sstrickl@google.com>
Reviewed-by: Ryan Macnak <rmacnak@google.com>
For proper crashpad integration, we need to generate a build ID, as the
build ID generated by crashpad if there is not one will be a simple XOR
of the first text page, which rarely changes for Dart snapshots.
Assembly snapshots already have a build ID included by the assembler, so
we currently only do this for ELF snapshots.
Currently the build ID is a 128-bit hash value that is four separate
32-bit hash values concatenated together. Those hash values come from
the contents of the VM and isolate .text and .rodata sections.
This change also contains work to separate out the concepts of sections
and segments in the ELF builder. Now, consecutive allocated sections
with the same write and execute flags are combined into a single PT_LOAD
segment when possible, which reduces the padding needed to ensure that
segments start on page boundaries in ELF snapshots.
Bug: https://github.com/dart-lang/sdk/issues/42020
Change-Id: I42a837dae665a3902d881b8d151b49ede87d6c67
Cq-Include-Trybots: luci.dart.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
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/150625
Commit-Queue: Tess Strickland <sstrickl@google.com>
Reviewed-by: Martin Kustermann <kustermann@google.com>
Instead, we just always add a BSS section and we add the ROData
sections for ELF snapshots in BlobImageWriter::WriteText() (similar
to how AssemblyImageWriter::WriteText() handles it for assembly).
Cq-Include-Trybots: luci.dart.try:vm-kernel-precomp-mac-release-simarm64-try,vm-kernel-precomp-win-release-x64-try,vm-kernel-precomp-linux-debug-x64-try,vm-kernel-precomp-linux-release-simarm_x64-try
Change-Id: I87ce64037821ce10f2344964e7f379376c4538df
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/150937
Reviewed-by: Martin Kustermann <kustermann@google.com>
The relocated addresses are populated during BSS::Initialize() for
natively loaded ELF snapshots, and during the non-native loader when it
is used. Putting this information in the BSS segment avoids having to
change the embedder interface, since we only need this information for
AOT snapshots. This also avoids depending on our ELF snapshot layout
to reverse-engineer the DSO base for ELF-compiled snapshots.
We now always print the DSO base for both the VM and isolate in
non-symbolic stack traces, not just for ELF-compiled snapshots. However,
we still only print the relocated addresses in individual stack frames
if we're guaranteed they match those in separately saved debugging
information.
Bug: https://github.com/dart-lang/sdk/issues/41880
Cq-Include-Trybots: luci.dart.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-win-release-x64-try,vm-kernel-precomp-mac-release-simarm64-try
Change-Id: I4837262f78e6e73a32eb7e24ef7a68ccb8ec2669
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/148441
Commit-Queue: Tess Strickland <sstrickl@google.com>
Reviewed-by: Martin Kustermann <kustermann@google.com>
Now when -v/--verbose is used, we will also print call information
when those calls appear in stubs that do not correspond to Dart code.
The returned information contains the name of the stub (the name of
the static symbol in the ELF file generated for the stub) as well as
the offset of the frame PC within the stub payload.
This change also adds a flag --dump-debug-file-contents that
outputs the parsed information from the file passed via -d/--debug.
Change-Id: Ic52dd6825f2f3564efa3c2c12b46a8bef23d56bc
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Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/139280
Commit-Queue: Teagan Strickland <sstrickl@google.com>
Reviewed-by: Martin Kustermann <kustermann@google.com>
We don't intend to migrate unittest to NNBD, so the remaining tests
that use it need to be migrated off. This takes care of the couple of
tests in standalone/ and standalone_2/ that used it.
The tests should behave the same as they did before. I verified by
making the tests fail in various ways after the migration and ensuring
that the tests failed as expected.
Change-Id: I938229cabad1d78a42a030970f2003edd36572f9
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/136060
Commit-Queue: Bob Nystrom <rnystrom@google.com>
Auto-Submit: Bob Nystrom <rnystrom@google.com>
Reviewed-by: Jonas Termansen <sortie@google.com>
We only check the expected stack starting from the call to
foo in main, so we no longer depend on what is captured in
the stacktrace for how main is invoked.
Also removes the old status lines for this test, which are no
longer applicable, and cleans up the documentation a little.
Fixes https://github.com/dart-lang/sdk/issues/39766.
Cq-Include-Trybots: luci.dart.try:vm-kernel-precomp-linux-release-x64-try,vm-kernel-precomp-linux-product-x64-try,vm-kernel-precomp-obfuscate-linux-release-x64-try
Change-Id: I66746f5a5169bce425bfd1f01a6a912b062e99c7
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/128737
Reviewed-by: Teagan Strickland <sstrickl@google.com>
Reviewed-by: Samir Jindel <sjindel@google.com>
Commit-Queue: Teagan Strickland <sstrickl@google.com>
Commit-Queue: Samir Jindel <sjindel@google.com>
Note that when generating unstripped ELF snapshots with --obfuscate,
this means DWARF sections in the resulting snapshot will leak
otherwise obfuscated information. To avoid this, use both --strip
to strip the generated snapshot and --save-debugging-info=<...> to
save the unobfuscated DWARF information to a separate file.
Fixes https://github.com/dart-lang/sdk/issues/35563.
Cq-Include-Trybots: luci.dart.try:vm-kernel-precomp-linux-release-x64-try,vm-kernel-precomp-android-release-arm64-try,vm-kernel-precomp-mac-release-simarm64-try,vm-kernel-precomp-win-release-x64-try
Change-Id: I545a737bd58fcd99c329386a552bd8951acf38b9
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/128732
Reviewed-by: Martin Kustermann <kustermann@google.com>
Removes an unnecessary change to the names of type testing stubs that
allowed name collisions to happen.
Old commit message:
The flag can be used when creating AOT snapshots. The resulting file can be
used with package:vm/dwarf/convert.dart to convert DWARF-based stack traces
to stack traces with function, file, and line number information.
Currently the saved file will be an ELF file with DWARF debugging information,
but this is subject to change in the future. To avoid being affected by any
changes in format, read the DWARF information from the file using
Dwarf.fromFile() in package:vm/dwarf/dwarf.dart.
Also adds --dwarf-stack-traces to the VM global flag list, so its value at
compilation will be read out of snapshots by the precompiled runtime.
Fixes https://github.com/dart-lang/sdk/issues/39512, which was due to
a missing compiler::target:: prefix for Instructions::HeaderSize() in
BlobImageWriter::WriteText().
Exposes the information suggested in
https://github.com/dart-lang/sdk/issues/39490 so that package:vm/dwarf
can appropriately convert absolute PC addresses to the correct virtual
address for a given DWARF line number program.
Bug: https://github.com/dart-lang/sdk/issues/35851
Change-Id: I6723449dceb0b89c054a1f1e70e7acd7749baf14
Cq-Include-Trybots: luci.dart.try:vm-kernel-precomp-linux-release-x64-try,vm-kernel-precomp-android-release-arm64-try,vm-kernel-precomp-mac-release-simarm64-try,vm-kernel-precomp-win-release-x64-try
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/128730
Reviewed-by: Martin Kustermann <kustermann@google.com>
REASON: the first commit in the chain contains a change that breaks internal
Flutter roll due to duplicated symbols for type testing stubs in assembly
snapshots.
Revert "[vm/compiler] Add --save-debugging-info flag to gen_snapshot."
This reverts commit c2b6c2e1db.
Revert "[vm] De-obfuscate function and file names in DWARF sections."
This reverts commit 4b8fd3c412.
Revert "[vm] Add docs for DWARF stack traces and related tools/libraries."
This reverts commit 5543e5ceb8.
Revert "[vm] Weaken dwarf_stack_trace expected stack trace."
This reverts commit 5824d3ed53.
Change-Id: I95ecd16fe493f61ae761dabfdd91a6ec0c2f0ca3
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/128776
Reviewed-by: Alexander Markov <alexmarkov@google.com>
Commit-Queue: Siva Annamalai <asiva@google.com>
We only check the expected stack starting from the call to
foo in main, so we no longer depend on what is captured in
the stacktrace for how main is invoked.
Also removes the old status lines for this test, which are no
longer applicable, and cleans up the documentation a little.
Fixes https://github.com/dart-lang/sdk/issues/39766.
Cq-Include-Trybots: luci.dart.try:vm-kernel-precomp-linux-release-x64-try,vm-kernel-precomp-linux-product-x64-try,vm-kernel-precomp-obfuscate-linux-release-x64-try
Change-Id: I61f0465dcd55d090c49db9c6af503ae9c0df6313
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/128401
Reviewed-by: Clement Skau <cskau@google.com>
Commit-Queue: Teagan Strickland <sstrickl@google.com>
Note that when generating unstripped ELF snapshots with --obfuscate,
this means DWARF sections in the resulting snapshot will leak
otherwise obfuscated information. To avoid this, use both --strip
to strip the generated snapshot and --save-debugging-info=<...> to
save the unobfuscated DWARF information to a separate file.
Fixes https://github.com/dart-lang/sdk/issues/35563.
Change-Id: I8795e2a5623ad5fc5362257007f677e622a7700b
Cq-Include-Trybots: luci.dart.try:vm-kernel-precomp-linux-release-x64-try,vm-kernel-precomp-android-release-arm64-try,vm-kernel-precomp-mac-release-simarm_x64-try,vm-kernel-precomp-win-release-x64-try
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/127166
Commit-Queue: Teagan Strickland <sstrickl@google.com>
Reviewed-by: Martin Kustermann <kustermann@google.com>
The flag can be used when creating AOT snapshots. The resulting file can be
used with package:vm/dwarf/convert.dart to convert DWARF-based stack traces
to stack traces with function, file, and line number information.
Currently the saved file will be an ELF file with DWARF debugging information,
but this is subject to change in the future. To avoid being affected by any
changes in format, read the DWARF information from the file using
Dwarf.fromFile() in package:vm/dwarf/dwarf.dart.
Also adds --dwarf-stack-traces to the VM global flag list, so its value at
compilation will be read out of snapshots by the precompiled runtime.
Fixes https://github.com/dart-lang/sdk/issues/39512, which was due to
a missing compiler::target:: prefix for Instructions::HeaderSize() in
BlobImageWriter::WriteText().
Exposes the information suggested in
https://github.com/dart-lang/sdk/issues/39490 so that package:vm/dwarf
can appropriately convert absolute PC addresses to the correct virtual
address for a given DWARF line number program.
Bug: https://github.com/dart-lang/sdk/issues/35851
Cq-Include-Trybots: luci.dart.try:vm-kernel-precomp-linux-debug-x64-try,vm-kernel-precomp-android-release-arm64-try,vm-kernel-precomp-mac-release-simarm_x64-try,vm-kernel-precomp-win-release-x64-try
Change-Id: I80d900fd9e5f1e2399ad3f2fd25c85131a7ea43c
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/121857
Commit-Queue: Teagan Strickland <sstrickl@google.com>
Reviewed-by: Martin Kustermann <kustermann@google.com>
Also fixes the low and high PC information in the DWARF output of
inlining nodes.
Bug: https://github.com/dart-lang/sdk/issues/35851
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Change-Id: I11c3577bdc5c12abdc88aa799c1aae3f505294df
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/123734
Commit-Queue: Teagan Strickland <sstrickl@google.com>
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Also switch some CQ bots using blobs to ELF. Once all embedders have migrated, we will remove blobs
support entirely.
Change-Id: Ie5e8c1187ad6c1af362b5715daafd3641bc8cc0e
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Reviewed-by: Martin Kustermann <kustermann@google.com>
