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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> |
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