Previously we used the start address of the AbstractCode object. This
doesn't make sense for off-heap builtins, where the code isn't contained
in the object itself. It also hides other potential problems - sometimes
the sample.pc is inside the AbstractCode object header - this is
never valid.
There were a few changes necessary to make this happen:
- Change the interface of CodeMoveEvent. Now 'to' and 'from' are both
AbstractCode objects, which is nice because many users were taking
'to' and adding the header offset to it to try and find the
instruction start address. This isn't valid for off-heap builtins.
- Fix a bug in CodeMap::MoveCode where we didn't update the CodeEntry
object to reflect the new instruction_start.
- Rename the 'start' field in all of the CodeEventRecord sub-classes
to make it clear that this is the address of the first instruction.
- Fix the confusion in RecordTickSample between 'tos' and 'pc' which
caused pc_offset to be calculated incorrectly.
Bug: v8:7983
Change-Id: I3e9dddf74e4b2e96a5f031d216ef7008d6f184d1
Reviewed-on: https://chromium-review.googlesource.com/1148457
Commit-Queue: Peter Marshall <petermarshall@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54749}
The current profiling mode (called kLeafNodeLineNumbers in this CL)
produces a tree, with each node representing a stack frame that is seen
in one or more samples taken during profiling. These nodes refer to a
particular function in a stack trace, but not to a particular line or
callsite within that function.
This CL adds a new more (called kCallerLineNumbers) which produces a
different profile tree, where each stack trace seen during profiling,
including the line number, has a unique path in the tree.
The profile tree was previously keyed on CodeEntry*. Now it is keyed on
the pair of CodeEntry* and line_number, meaning it has distinct nodes
for those combinations which exist, and each distinct stack trace that
was sampled is represented in the tree.
For optimized code where we have inline frames, there are no line
numbers for the inline frames in the stack trace, causing duplicate
branches in the tree with kNoLineNumberInfo as the reported line number.
This will be addressed in follow-ups.
Bug: v8:7018
Cq-Include-Trybots: luci.chromium.try:linux_chromium_rel_ng
Change-Id: I512e221508f5b50ec028306d212263b514a9fb24
Reviewed-on: https://chromium-review.googlesource.com/1013493
Commit-Queue: Peter Marshall <petermarshall@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#53298}
This map is often quite small and holds small items (ints) so wastes
quite a bit of overhead in the backing tree representation.
This CL changes the std::map to a sorted vector of pairs. This reduces
the size significantly (2.13 MiB -> 598 KiB on the node server example).
Bug: v8:7719
Change-Id: Ic829693f007732ae145fae02850a1ed913cd941e
Reviewed-on: https://chromium-review.googlesource.com/1064233
Commit-Queue: Peter Marshall <petermarshall@chromium.org>
Reviewed-by: Alexei Filippov <alph@chromium.org>
Cr-Commit-Position: refs/heads/master@{#53278}
ProfilerListener which holds CodeEntries has been moved from Logger to
CpuProfiler. This way we can clear entries when all the profiles
produced by a particular CpuProfiler are deleted.
BUG=v8:7719
Change-Id: I31d47dc7da44648c8fb8e87b47e2e6260d3dc5c3
Reviewed-on: https://chromium-review.googlesource.com/1043050
Reviewed-by: Peter Marshall <petermarshall@chromium.org>
Commit-Queue: Alexei Filippov <alph@chromium.org>
Cr-Commit-Position: refs/heads/master@{#53004}
When running this test locally, the OptimizeFunctionOnNextCall
call fails, because the line above has no semicolon, and automatic
insertion doesn't help, probably because of the % sign. The test still
runs, but the first call after level1() fails, meaning the inlining
does not happen.
Change-Id: Icd2d08e676ea3cade63d4e12277748a447e410fc
Reviewed-on: https://chromium-review.googlesource.com/1030210
Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Commit-Queue: Peter Marshall <petermarshall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#52808}
The "Address" type is V8's general-purpose type for manipulating memory
addresses. Per the C++ spec, pointer arithmetic and pointer comparisons
are undefined behavior except within the same array; since we generally
don't operate within a C++ array, our general-purpose type shouldn't be
a pointer type.
Bug: v8:3770
Cq-Include-Trybots: luci.chromium.try:linux_chromium_rel_ng;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: Ib96016c24a0f18bcdba916dabd83e3f24a1b5779
Reviewed-on: https://chromium-review.googlesource.com/988657
Commit-Queue: Jakob Kummerow <jkummerow@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/master@{#52601}
Looking up line numbers with the JITLineInfoTable would sometimes give
wrong answers. Fix these bugs and add a cctest for this data structure.
Also do some cleanup while we're here like inlining the (empty)
constructor and destructor and removing the empty() method which is
only used unnecessarily anyway, to make the contract of
GetSourceLineNumber a bit clearer.
Also rename the data structure to SourcePositionTable, because it
doesn't just provide info for JIT code, but also bytecode, and 'Info'
is pretty ambiguous.
Bug: v8:7018
Change-Id: I126581c844d85df6b2b3f80f2f5acbce01c16ba1
Reviewed-on: https://chromium-review.googlesource.com/1006795
Reviewed-by: Yang Guo <yangguo@chromium.org>
Commit-Queue: Peter Marshall <petermarshall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#52571}
Previously embedder had to create an instance of TracingCpuProfiler explicitly.
The patch makes the profiler created automatically for every isolate.
The profiler has no overhead unless tracing with v8.cpu_profiler category is enabled.
Cq-Include-Trybots: luci.chromium.try:linux_chromium_rel_ng
Change-Id: I9369c2c56bcddc72093eda33dc2bc185c9253b4a
Reviewed-on: https://chromium-review.googlesource.com/1006049
Commit-Queue: Alexei Filippov <alph@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#52552}
In order to clarify the difference between, e.g., InstructionStart and
instruction_start, rename as follows:
Code::instruction_start -> raw_instruction_start
Code::instruction_end -> raw_instruction_end
Code::instruction_size -> raw_instruction_size
The difference between the camel-case and raw_* function families is
in how they handle off-heap-trampoline Code objects. For example, when
called on an off-heap-trampoline: raw_instruction_start returns the
trampoline's entry point, while InstructionStart returns the off-heap
code's entry point (located in the .text section of the binary).
Some callsites were updated to call the camel-case function family as
appropriate.
Bug: v8:6666
Change-Id: I4a572f47c2d161a853599d7c17879e263b0d1a87
Reviewed-on: https://chromium-review.googlesource.com/997532
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#52387}
The VM state is a property of the isolate, not the CPU profiler.
Having to create a v8::CpuProfiler instance in order to change
the property is somewhat inefficient.
See https://github.com/nodejs/node/issues/18039 and
https://github.com/nodejs/node/pull/18534 for context.
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Change-Id: I70e31deca6529bccc05a0f4ed500ee268fb63cb8
Reviewed-on: https://chromium-review.googlesource.com/900622
Commit-Queue: Yang Guo <yangguo@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#51779}
Use the script name from the shared function info to create an
inline entry. Otherwise functions are attributed to the wrong file
in the CpuProfileNode.
See https://github.com/GoogleCloudPlatform/cloud-profiler-nodejs/issues/89
Bug: v8:7203, v8:7241
Change-Id: I8ea31943741770e6611275a9c93375922b934547
Reviewed-on: https://chromium-review.googlesource.com/848093
Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Commit-Queue: Franziska Hinkelmann <franzih@chromium.org>
Cr-Commit-Position: refs/heads/master@{#50339}
This reverts commit c500aa9fb0.
Reason for revert: Breaks V8 Linux64 - gyp
Original change's description:
> [cpu-profiler] Fix script name when recording inlining info
>
> Use the script name from the shared function info to create an
> inline entry. Otherwise functions are attributed to the wrong file
> in the CpuProfileNode.
>
> See https://github.com/GoogleCloudPlatform/cloud-profiler-nodejs/issues/89
>
>
> Bug: v8:7203, v8:7241
> Change-Id: I7a7524ad68a295efd35ef94295cd48f823376e07
> Reviewed-on: https://chromium-review.googlesource.com/845624
> Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
> Commit-Queue: Franziska Hinkelmann <franzih@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#50324}
TBR=jarin@chromium.org,franzih@chromium.org
Change-Id: I5876d24723bb6bd20854db91a579485b07313a69
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:7203, v8:7241
Reviewed-on: https://chromium-review.googlesource.com/846771
Reviewed-by: Franziska Hinkelmann <franzih@chromium.org>
Commit-Queue: Franziska Hinkelmann <franzih@chromium.org>
Cr-Commit-Position: refs/heads/master@{#50325}
Use the script name from the shared function info to create an
inline entry. Otherwise functions are attributed to the wrong file
in the CpuProfileNode.
See https://github.com/GoogleCloudPlatform/cloud-profiler-nodejs/issues/89
Bug: v8:7203, v8:7241
Change-Id: I7a7524ad68a295efd35ef94295cd48f823376e07
Reviewed-on: https://chromium-review.googlesource.com/845624
Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Commit-Queue: Franziska Hinkelmann <franzih@chromium.org>
Cr-Commit-Position: refs/heads/master@{#50324}
Remove comment about usage of FATAL, UNREACHABLE and UNIMPLEMENTED,
which was deprecated since https://crrev.com/1410713006.
Also, refactor the FATAL macro and use it for implementing UNREACHABLE
and UNIMPLEMENTED, and in more code. The benefit over printf +
CHECK(false) is that the compiler knows that FATAL will never return.
R=bmeurer@chromium.org
Change-Id: I8c2ab3b4e6edfe8eff5ec6fdf3d92b15d0ed7126
Reviewed-on: https://chromium-review.googlesource.com/832726
Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#50183}
The new frame type is inteneded to represent native C++ stack frames.
JS code may sometimes make calls to helper native functions that do not
provide any special stack layout besides the return address and frame pointer.
Currently the stack iterator bails out when it sees an unknown frame.
The patch allows the iterator to unwind stacks having such frames.
BUG=chromium:768540
Change-Id: I9c273c7015695a6733c0a0c52b522fca7b25de0d
Reviewed-on: https://chromium-review.googlesource.com/794991
Commit-Queue: Alexei Filippov <alph@chromium.org>
Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#50058}
Performed manual testing as well by making 20 CPU profile recordings of
loading http://meduza.io page. Without the patch the page renderer memory size
grows beyond 300MB. With the patch it remains below 200MB.
BUG=v8:6623
Change-Id: Ifce541b84bb2aaaa5175520f8dd49dbc0cb5dd20
Reviewed-on: https://chromium-review.googlesource.com/798020
Commit-Queue: Alexei Filippov <alph@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49914}
With this CL, {CreateDefaultPlatform} returns a unique_ptr to indicate
that the caller owns the returned memory. We had several memory leaks
where the memory of the DefaultPlatform did not get deallocated.
In addition, the {TracingController} of the {DefaultPlatform} also gets
received as a unique_ptr. Thereby we document that the {DefaultPlatform}
takes ownership of the {TracingController}. Note that the memory of the
{TracingController} was already owned by the {DefaultPlatform}, but it
was not documented in the interface, and it was used incorrectly in
tests.
This CL fixes the asan issues in
https://chromium-review.googlesource.com/c/v8/v8/+/753583
([platform] Implement TaskRunners in the DefaultPlatform)
R=rmcilroy@chromium.org
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_chromium_rel_ng
Change-Id: I0d1a6d3b22bb8289dc050b1977e4f58381cec675
Reviewed-on: https://chromium-review.googlesource.com/755033
Reviewed-by: Adam Klein <adamk@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Commit-Queue: Andreas Haas <ahaas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49349}
The method forces all running profilers attached to the provided isolate
to collect a sample with the current stack.
It is going to be used to synchronize trace events generated by embedder with the samples
collected by the profiler.
Also it will finally allow us to break dependency of isolate on CPU profiler.
BUG=chromium:721099
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_chromium_rel_ng
Change-Id: I81a0f8a463f837b5201bc8edaf2eb4f3761e3ff8
Reviewed-on: https://chromium-review.googlesource.com/750264
Reviewed-by: Yang Guo <yangguo@chromium.org>
Commit-Queue: Alexei Filippov <alph@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49236}
New code should use nullptr instead of NULL.
This patch updates existing use of NULL to nullptr where applicable,
making the code base more consistent.
BUG=v8:6928,v8:6921
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_chromium_rel_ng;master.tryserver.v8:v8_linux_noi18n_rel_ng
Change-Id: I4687f5b96fcfd88b41fa970a2b937b4f6538777c
Reviewed-on: https://chromium-review.googlesource.com/718338
Commit-Queue: Mathias Bynens <mathias@chromium.org>
Reviewed-by: Andreas Haas <ahaas@chromium.org>
Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48557}
When starting profiling, we iterate the heap to find all existing code
objects and the associated functions.
The iteration tried to log the function's code if either the closure's
code was optimized-but-not-deoptimized or if the optimized code in its
feedback vector was optimized-but-not-deoptimized.
That caused some trouble if the function's code was deoptimized but
we had a valid optimized code in the feedback vector. In that case
we would log the deoptimized code object from the closure, which
would later crash when trying to access the deoptimization information
(which we clear on deoptimization).
This CL just fixes the iteration so that we do not crash. A better fix
might be to log the function's code object if not deoptimized *and*
the code object in type feedback vector if not not deoptimized. Or
perhaps iterate optimized code objects and log those that have
deoptimization information.
Bug: chromium:763073
Change-Id: Iddee6a1c8b0fe332186ef7af2f3751c8828434b1
Reviewed-on: https://chromium-review.googlesource.com/709116
Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Commit-Queue: Jaroslav Sevcik <jarin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48437}
To enable executing code in a context of a particular time or date (e.g. when
codepath depends on whether it's say evening or New Year) there is a need for
a way to provide it bypassing actual system time.
Bug: chromium:751993
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_chromium_rel_ng
Change-Id: Iee35d97b74345f63fff814a65a6f134d7c970341
Reviewed-on: https://chromium-review.googlesource.com/598666
Commit-Queue: Sergei Datsenko <dats@chromium.org>
Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#47700}
As part of J2V8 development (https://github.com/eclipsesource/J2V8),
we realized that we had a subtle bug in how Isolate scope was created
and it's lifetime managed, see:
https://github.com/eclipsesource/J2V8/issues/313.
Mentioned above bug was fixed, however, what we also noticed is that
V8 API has been constantly and slowly moving to such an API, in which
one has to pass Isolate explicitly to methods and/or constructors. We
found two more places that might have been overlooked. This contribution
adds passing of Isolate pointer explicitly to constructors of
String::Utf8Value and String::Value classes.
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_chromium_rel_ng;master.tryserver.v8:v8_linux_noi18n_rel_ng
Change-Id: I61984285f152aba5ca922100cf3df913a9cb2cea
Reviewed-on: https://chromium-review.googlesource.com/593309
Commit-Queue: Adam Klein <adamk@chromium.org>
Reviewed-by: Adam Klein <adamk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#47656}
Crankshaft flag and opt flag mostly serve the same purpose. Using
crankshaft to mean use optimizing compiler is a bit confusing.
This cl: https://chromium-review.googlesource.com/c/490206/ fixes
the tests to use opt instead of crankshaft flag.
One difference between --no-crankshaft and --no-opt would be that
--no-opt would mean no optimizations at all where as with --no-crankshaft
would mean we can force optimizations using %OptimizeFunctionOnNextCall.
Bug: v8:6325
Change-Id: If17393ac5b6af4ea6e9a98e092f0261c2e0899c5
Reviewed-on: https://chromium-review.googlesource.com/490307
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Commit-Queue: Mythri Alle <mythria@chromium.org>
Cr-Commit-Position: refs/heads/master@{#45298}
1. Replaces --crankshaft with --opt in tests.
2. Also fixes presubmit to check for --opt flag when
assertOptimized is used.
3. Updates testrunner/local/variants.py and
v8_foozie.py to use --opt flag.
This would mean, nooptimize variant means there are
no optimizations. Not even with %OptimizeFunctionOnNextCall.
Bug:v8:6325
Change-Id: I638e743d0773a6729c6b9749e2ca1e2537f12ce6
Reviewed-on: https://chromium-review.googlesource.com/490206
Commit-Queue: Mythri Alle <mythria@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#44985}
Most callers passed kFinalizeIncrementalMarkingMask, so use that as
a default argument (not using default argument syntax to avoid including
heap.h in cctest.h).
Change-Id: I904f1eb3a0f5fdbe63eab16f6a6f01d04618645d
Reviewed-on: https://chromium-review.googlesource.com/488104
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Adam Klein <adamk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#44950}
This fixes the corner-case where the method in question failed to lookup
the very last deoptimization bailout without subsequent entries within
the relocation info. Also enable a test covering this.
R=tebbi@chromium.org
TEST=cctest/test-cpu-profiler/CollectDeoptEvents
Review-Url: https://codereview.chromium.org/2565733002
Cr-Commit-Position: refs/heads/master@{#41623}
The new SourcePosition class allows for precise tracking of source positions including the stack of inlinings. This CL makes the cpu profiler use this new information. Before, the cpu profiler used the deoptimization data to reconstruct the inlining stack. However, optimizing compilers (especially Turbofan) can hoist out checks such that the inlining stack of the deopt reason and the inlining stack of the position the deoptimizer jumps to can be different (the old cpu profiler tests and the ones introduced in this cl produce such situations for turbofan). In this case, relying on the deoptimization info produces paradoxical results, where the reported position is before the function responsible is called. Even worse, https://codereview.chromium.org/2451853002/ combines the precise position with the wrong inlining stack from the deopt info, leading to completely wrong results.
Other changes in this CL:
- DeoptInlinedFrame is no longer needed, because we can compute the correct inlining stack up front.
- I changed the cpu profiler tests back to test situations where deopt checks are hoisted out in Turbofan and made them robust enough to handle the differences between Crankshaft and Turbofan.
- I reversed the order of SourcePosition::InliningStack to make it match the cpu profiler convention.
- I removed CodeDeoptEvent::position, as it is no longer used.
R=alph@chromium.org
BUG=v8:5432
Review-Url: https://codereview.chromium.org/2503393002
Cr-Commit-Position: refs/heads/master@{#41168}
SourcePosition::InliningId() refers to a the new table DeoptimizationInputData::InliningPositions(), which provides the following data for every inlining id:
- The inlined SharedFunctionInfo as an offset into DeoptimizationInfo::LiteralArray
- The SourcePosition of the inlining. Recursively, this yields the full inlining stack.
Before the Code object is created, the same information can be found in CompilationInfo::inlined_functions().
If SourcePosition::InliningId() is SourcePosition::kNotInlined, it refers to the outer (non-inlined) function.
So every SourcePosition has full information about its inlining stack, as long as the corresponding Code object is known. The internal represenation of a source position is a positive 64bit integer.
All compilers create now appropriate source positions for inlined functions. In the case of Turbofan, this required using AstGraphBuilderWithPositions for inlined functions too. So this class is now moved to a header file.
At the moment, the additional information in source positions is only used in --trace-deopt and --code-comments. The profiler needs to be updated, at the moment it gets the correct script offsets from the deopt info, but the wrong script id from the reconstructed deopt stack, which can lead to wrong outputs. This should be resolved by making the profiler use the new inlining information for deopts.
I activated the inlined deoptimization tests in test-cpu-profiler.cc for Turbofan, changing them to a case where the deopt stack and the inlining position agree. It is currently still broken for other cases.
The following additional changes were necessary:
- The source position table (internal::SourcePositionTableBuilder etc.) supports now 64bit source positions. Encoding source positions in a single 64bit int together with the difference encoding in the source position table results in very little overhead for the inlining id, since only 12% of the source positions in Octane have a changed inlining id.
- The class HPositionInfo was effectively dead code and is now removed.
- SourcePosition has new printing and information facilities, including computing a full inlining stack.
- I had to rename compiler/source-position.{h,cc} to compiler/compiler-source-position-table.{h,cc} to avoid clashes with the new src/source-position.cc file.
- I wrote the new wrapper PodArray for ByteArray. It is a template working with any POD-type. This is used in DeoptimizationInputData::InliningPositions().
- I removed HInlinedFunctionInfo and HGraph::inlined_function_infos, because they were only used for the now obsolete Crankshaft inlining ids.
- Crankshaft managed a list of inlined functions in Lithium: LChunk::inlined_functions. This is an analog structure to CompilationInfo::inlined_functions. So I removed LChunk::inlined_functions and made Crankshaft use CompilationInfo::inlined_functions instead, because this was necessary to register the offsets into the literal array in a uniform way. This is a safe change because LChunk::inlined_functions has no other uses and the functions in CompilationInfo::inlined_functions have a strictly longer lifespan, being created earlier (in Hydrogen already).
BUG=v8:5432
Review-Url: https://codereview.chromium.org/2451853002
Cr-Commit-Position: refs/heads/master@{#40975}
With this CL, we set the is_source_positions_enabled flag on CompilationInfo when
- a command line flag is enabled that requires Turbofan to preserve source position
information (e.g. --trace-deopt), and
- when profiling is enabled.
This also removes the --turbo-source-positions flag.
The goal is to eventually only track source position information when needed.
R=mstarzinger@chromium.org
BUG=v8:5439
Review-Url: https://codereview.chromium.org/2484163003
Cr-Commit-Position: refs/heads/master@{#40836}
These are added to the sampler stack trace when RCS are
enabled.
Resource name for a RCS frame is reported as "V8Runtime".
Counter names match ones from src/counters.h
BUG=chromium:660428
Review-Url: https://codereview.chromium.org/2461003002
Cr-Commit-Position: refs/heads/master@{#40658}
