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  1. 20 Oct, 2020 4 commits
    • Jakob Gruber's avatar
      [code] Move the unwinding info into metadata area · c5379162
      Jakob Gruber authored 
      Semantically, the unwinding info is a variable-size metadata table
with untagged (i.e. no relocation needed) contents, packed inside Code
objects. This is just like other metadata tables (safepoint table,
handler table, constant pool, code comments); but for historical
reasons it's been treated differently so far. Unlike these other
tables, the unwinding info was located *after* InstructionEnd, and its
size was written to the first 8 bytes after InstructionEnd.

This CL makes unwinding info handling more consistent with other
metadata tables by writing its offset into a dedicated
kUnwindingInfoOffsetOffset header slot, and by moving the actual data
inside the [InstructionStart,InstructionEnd[ area. In follow-up CLs,
this area will be split into dedicated instruction- and metadata
areas.

A picture is worth 1000 words, before:

 +--------------------------+  <-- raw_instruction_start()
 |       instructions       |
 |           ...            |
 +--------------------------+
 |     embedded metadata    |  <-- safepoint_table_offset()
 |           ...            |  <-- handler_table_offset()
 |                          |  <-- constant_pool_offset()
 |                          |  <-- code_comments_offset()
 |    padding to the next   |
 |  8-byte aligned address  |
 +--------------------------+  <-- raw_instruction_end()
 |   [unwinding_info_size]  |
 |        as uint64_t       |
 +--------------------------+  <-- unwinding_info_start()
 |       unwinding info     |
 |            ...           |
 +--------------------------+  <-- unwinding_info_end()

After:

 +--------------------------+  <-- raw_instruction_start()
 |       instructions       |
 |           ...            |
 +--------------------------+
 |     embedded metadata    |  <-- safepoint_table_offset()
 |           ...            |  <-- handler_table_offset()
 |                          |  <-- constant_pool_offset()
 |                          |  <-- code_comments_offset()
 |                          |  <-- unwinding_info_offset()
 |                          |
 +--------------------------+  <-- raw_instruction_end()

Bug: v8:11036
Change-Id: I649708821acc5365186ca2c9cff2669fc3e91fd3
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2484795Reviewed-by: 's avatarDominik Inführ <dinfuehr@chromium.org>
Reviewed-by: 's avatarLeszek Swirski <leszeks@chromium.org>
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#70640}
      c5379162
    • v8-ci-autoroll-builder's avatar
      Update V8 DEPS. · fe1c9190
      v8-ci-autoroll-builder authored 
      Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/198585c..d68ca6a

Rolling v8/third_party/aemu-linux-x64: kj9nh6CkrdEq-ctobPV7CtPMwpdU4VrQx_JgZCmejxQC..Dg0s5PKnfzzCVjDNe8EuKAnOGVVpKvB-dKqia-IpGkgC

Rolling v8/third_party/catapult: https://chromium.googlesource.com/catapult/+log/89eeef5..d384f36

Rolling v8/third_party/depot_tools: https://chromium.googlesource.com/chromium/tools/depot_tools/+log/958dc62..792630c

Rolling v8/tools/clang: https://chromium.googlesource.com/chromium/src/tools/clang/+log/3a982ad..4135c06

TBR=machenbach@chromium.org,tmrts@chromium.org,v8-waterfall-sheriff@grotations.appspotmail.com

Change-Id: I2ce24ab2ca6189cc614a978255f83812c263960c
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2485720Reviewed-by: 's avatarv8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Commit-Queue: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#70639}
      fe1c9190
    • Frank Tang's avatar
      [Intl] call new ListFormatter::createInstance · 035c305c
      Frank Tang authored 
      The one we currently using is now marked as internal and to be removed
for 68. Migrating to the style which already avaiable in ICU 67-1.

Bug: v8:11031
Change-Id: I668382a2e1b8602ddca02bf231c5008a6c92bf2d
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2477751Reviewed-by: 's avatarJakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Frank Tang <ftang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#70638}
      035c305c
    • Junliang Yan's avatar
      PPC/s390: [deoptimizer] Change deopt entries into builtins · 5d5ed19f
      Junliang Yan authored 
      Port 7f58ced7

Original Commit Message:

    While the overall goal of this commit is to change deoptimization
    entries into builtins, there are multiple related things happening:

    - Deoptimization entries, formerly stubs (i.e. Code objects generated
      at runtime, guaranteed to be immovable), have been converted into
      builtins. The major restriction is that we now need to preserve the
      kRootRegister, which was formerly used on most architectures to pass
      the deoptimization id. The solution differs based on platform.
    - Renamed DEOPT_ENTRIES_OR_FOR_TESTING code kind to FOR_TESTING.
    - Removed heap/ support for immovable Code generation.
    - Removed the DeserializerData class (no longer needed).
    - arm64: to preserve 4-byte deopt exits, introduced a new optimization
      in which the final jump to the deoptimization entry is generated
      once per Code object, and deopt exits can continue to emit a
      near-call.
    - arm,ia32,x64: change to fixed-size deopt exits. This reduces exit
      sizes by 4/8, 5, and 5 bytes, respectively.

    On arm the deopt exit size is reduced from 12 (or 16) bytes to 8 bytes
    by using the same strategy as on arm64 (recalc deopt id from return
    address). Before:

     e300a002       movw r10, <id>
     e59fc024       ldr ip, [pc, <entry offset>]
     e12fff3c       blx ip

    After:

     e59acb35       ldr ip, [r10, <entry offset>]
     e12fff3c       blx ip

    On arm64 the deopt exit size remains 4 bytes (or 8 bytes in same cases
    with CFI). Additionally, up to 4 builtin jumps are emitted per Code
    object (max 32 bytes added overhead per Code object). Before:

     9401cdae       bl <entry offset>

    After:

     # eager deoptimization entry jump.
     f95b1f50       ldr x16, [x26, <eager entry offset>]
     d61f0200       br x16
     # lazy deoptimization entry jump.
     f95b2b50       ldr x16, [x26, <lazy entry offset>]
     d61f0200       br x16
     # the deopt exit.
     97fffffc       bl <eager deoptimization entry jump offset>

    On ia32 the deopt exit size is reduced from 10 to 5 bytes. Before:

     bb00000000     mov ebx,<id>
     e825f5372b     call <entry>

    After:

     e8ea2256ba     call <entry>

    On x64 the deopt exit size is reduced from 12 to 7 bytes. Before:

     49c7c511000000 REX.W movq r13,<id>
     e8ea2f0700     call <entry>

    After:

     41ff9560360000 call [r13+<entry offset>]

R=jgruber@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com, miladfar@ca.ibm.com
BUG=
LOG=N

Change-Id: I49e4c92759043e46beb3c76c97823285b16feeef
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2486225Reviewed-by: 's avatarMilad Fa <mfarazma@redhat.com>
Commit-Queue: Junliang Yan <junyan@redhat.com>
Cr-Commit-Position: refs/heads/master@{#70637}
      5d5ed19f
  3. 19 Oct, 2020 36 commits