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6607 Commits

Author SHA1 Message Date
dslomov@chromium.org
c9049c0325 Keyed loads from super with numeric keys. 
R=ishell@chromium.org, arv@chromium.org
BUG=v8:3330
LOG=N

Review URL: https://codereview.chromium.org/638193004

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24522 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-10 10:40:29 +00:00
bmeurer@chromium.org
059e4c206e [turbofan] Optimize Uint32LessThan with Word32Sar. 
TEST=unittests
R=jarin@chromium.org

Review URL: https://codereview.chromium.org/648663002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24520 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-10 10:23:04 +00:00
mvstanton@chromium.org
52575220d4 Teach TurboFan to call vector-based ICs. 
Additional static information needs to be passed to Load and KeyedLoad calls if
--vector-ics is turned on.

R=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/633423002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24519 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-10 09:49:43 +00:00
yangguo@chromium.org
889d1e540c Conform to the unittest naming convention. 
R=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/644973002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24513 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-10 08:06:21 +00:00
yangguo@chromium.org
0dd69ec439 Allow identifier code points from supplementary multilingual planes. 
ES5.1 section 6 ("Source Text"):
"Throughout the rest of this document, the phrase “code unit” and the
word “character” will be used to refer to a 16-bit unsigned value
used to represent a single 16-bit unit of text."

This changed in ES6 draft section 10.1 ("Source Text"):
"The ECMAScript code is expressed using Unicode, version 5.1 or later.
ECMAScript source text is a sequence of code points. All Unicode code
point values from U+0000 to U+10FFFF, including surrogate code points,
may occur in source text where permitted by the ECMAScript grammars."

This patch is to reflect this spec change.

BUG=v8:3617
LOG=Y
R=jochen@chromium.org

Review URL: https://codereview.chromium.org/640193002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24510 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-10 07:13:46 +00:00
ulan@chromium.org
29296d7e50 Fix computation of UTC time from local time at DST change points. 
This also reverts r23606, which was an incorrect fix.

BUG=v8:3116,chromium:417640,chromium:415424
LOG=Y
TEST=mjsunit/regress/regress-3116.js
R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/639383002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24499 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-09 14:17:33 +00:00
machenbach@chromium.org
8e54052b10 Remove perf tests that are moved to another location. 
TBR=dslomov@chromium.org, bmeurer@chromium.org

Review URL: https://codereview.chromium.org/645583002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24496 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-09 13:25:42 +00:00
dslomov@chromium.org
2fd8a7f6b8 Convert obj ToObject in Object.keys() 
BUG=v8:3587
LOG=Y
R=arv@chromium.org, dslomov@chromium.org

Review URL: https://codereview.chromium.org/585373003

Patch from Caitlin Potter <caitpotter88@gmail.com>.

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24495 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-09 13:19:02 +00:00
machenbach@chromium.org
75f665d203 Move js perf test to another directory. 
TBR=dslomov@chromium.org, bmeurer@chromium.org

Review URL: https://codereview.chromium.org/641033003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24493 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-09 12:41:36 +00:00
bmeurer@chromium.org
c95ba9bd04 [turbofan] Eliminate redundant masking operations for word8/word16 stores. 
There's no need to apply 0xff when storing 8-bit values or 0xffff when
storing 16-bit values.

TEST=unittests
R=titzer@chromium.org

Review URL: https://codereview.chromium.org/642033002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24492 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-09 12:20:45 +00:00
dslomov@chromium.org
53c9f0bb3d Keyed stores to super where key is a name. 
R=arv@chromium.org, ishell@chromium.org
BUG=v:3330
LOG=N

Review URL: https://codereview.chromium.org/638623002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24490 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-09 11:36:22 +00:00
bmeurer@chromium.org
f0452e2193 [turbofan] Add support for ARM64 Ubfx 
Support selecting Ubfx for shift-mask and mask-shift operations. Also, rename
the shifts to match the instruction names.

BUG=
R=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/633123002

Patch from Martyn Capewell <m.m.capewell@googlemail.com>.

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24482 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-09 09:18:31 +00:00
yangguo@chromium.org
8659e50723 Update unicode to 7.0.0. 
And do not use code points with PATTERN_* property for identifier start.
Maintain that \u180E is a white space character.

BUG=v8:2892
LOG=Y
R=dpino@igalia.com, mathias@qiwi.be

Review URL: https://codereview.chromium.org/638643002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24473 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-08 14:55:03 +00:00
arv@chromium.org
c8b1c3e784 Classes: Add support for toString 
BUG=v8:3330
LOG=Y
R=dslomov@chromium.org

Review URL: https://codereview.chromium.org/624013005

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24472 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-08 14:48:48 +00:00
mstarzinger@chromium.org
f99fd3867b Remove premordial math functions from native context. 
R=rossberg@chromium.org

Review URL: https://codereview.chromium.org/635323002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24471 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-08 14:42:31 +00:00
bmeurer@chromium.org
9b306893a3 [turbofan] Properly emit bounds checks for typed array element loads. 
Also fix an awfull bug in simplified lowering.

TEST=cctest,mjsunit/asm
R=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/640603003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24463 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-08 11:16:45 +00:00
titzer@chromium.org
015f963e8f Lower NumberMultiply, NumberDivide, and NumberModulus to Int32Mul, Int32[U]Div, and Int32[U]Mod when possible in simplified-lowering. 
R=mstarzinger@chromium.org
BUG=

Review URL: https://codereview.chromium.org/620553008

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24462 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-08 10:53:46 +00:00
jochen@chromium.org
e1fe5da318 CcTest::isolate_used_ is used from multiple threads, make it atomic 
BUG=none
R=svenpanne@chromium.org
LOG=n

Review URL: https://codereview.chromium.org/637263003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24460 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-08 09:34:40 +00:00
titzer@chromium.org
42365d429c The empty husk of a JSFunction is useful to us. 
We hollow out the rotting core and with evil intent repurpose its dry carcass to empower ourselves; with such a shell we can test.

R=mstarzinger@chromium.org

BUG=

Review URL: https://codereview.chromium.org/637873002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24459 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-08 09:23:33 +00:00
jochen@chromium.org
c5c02d3bd4 Fix race in debugger threads in cctest/test-debug 
BUG=none
R=svenpanne@chromium.org, ishell@chromium.org
LOG=n

Review URL: https://codereview.chromium.org/637283002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24455 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-08 08:56:57 +00:00
jarin@chromium.org
bb5b39260b Relax representation requirement in FrameStates. 
This change enables non-tagged representations in FrameStates.

That allows us to run zlib with deoptimization support and have almost the same performance of the generated code (as the code with no deoptimization). Unfortunately, the frame states seem to confuse typer. As a consequence, we generate more representation changes, which in turn causes the scheduler to take a lot more time and memory (>4x). The added compiler time makes zlib with deopt be about 50% slower.

BUG=
R=titzer@chromium.org

Review URL: https://codereview.chromium.org/614713002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24454 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-08 08:47:29 +00:00
jochen@chromium.org
73733bb3eb Fix data races and leaks related to v8::Lockers 
BUG=v8:3618
R=ishell@chromium.org, svenpanne@chromium.org
LOG=n

Review URL: https://codereview.chromium.org/637263002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24453 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-08 08:17:04 +00:00
bmeurer@chromium.org
db33f07f79 [turbofan] Reenable value numbering. 
Value numbering is now limited to eliminatable operators (i.e. operators
that don't throw and don't write), and uses linear probing instead of
separate chaining.

TEST=unittests
R=svenpanne@chromium.org

Review URL: https://codereview.chromium.org/630423002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24452 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-08 08:06:59 +00:00
jochen@chromium.org
d78fab455a Fix data race in cctest/test-api/RegExpInterruption 
BUG=v8:3615
R=yangguo@chromium.org
LOG=n

Review URL: https://codereview.chromium.org/634523003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24451 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-08 07:41:28 +00:00
bmeurer@chromium.org
8617b3acf8 [turbofan] Fix HashCode/Equals for floating point operators. 
Those floating point constant operators require bitwise handling of
their parameters, otherwise 0.0 equals -0.0. This is solved in a
general way by adding new base::bit_equal_to and base::bit_hash
function objects.

TEST=unittests
R=svenpanne@chromium.org

Review URL: https://codereview.chromium.org/636953002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24450 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-08 07:32:07 +00:00
weiliang.lin@intel.com
5c0bd0cb00 X87: [turbofan] support all shift operands on ia32 
port r24387.

original commit message:
  [turbofan] support all shift operands on ia32

BUG=
R=weiliang.lin@intel.com

Review URL: https://codereview.chromium.org/637193002

Patch from Chunyang Dai <chunyang.dai@intel.com>.

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24448 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-08 06:13:22 +00:00
adamk@chromium.org
a0f80eddde Add test case demonstrating bug in SparseReverse when combined with getters/setters 
BUG=v8:3612
LOG=N
R=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/628383002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24443 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-07 19:22:44 +00:00
arv@chromium.org
583868288a This uses a runtime function to set up the the constructor and its 
prototype.

This does not add the methods/accessors to the prototype or the
constructor.

BUG=v8:3330
LOG=Y
R=dslomov@chromium.org

Review URL: https://codereview.chromium.org/631433002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24442 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-07 16:24:59 +00:00
jochen@chromium.org
5a6f37c77e Fix compilation on win64 
TBR=bmeurer@chromium.org
LOG=n
BUG=none

Review URL: https://codereview.chromium.org/613093004

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24440 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-07 16:00:44 +00:00
bmeurer@chromium.org
a17289f4bc [turbofan] Drop broken StaticParameterTraits. 
The StaticParameterTraits are broken by design, and cause way too much
trouble. The compilers usually pick the wrong specialization (i.e. the
default specialization is picked for Load and Phi even tho there is a
specialization for MachineType), which is not only the reason why GVN is
ineffective and slow, but can also lead to correctness issues in some
rare cases.

Also clean up some minor bugs/inconsistencies on the way.

TEST=cctest,unittests
R=svenpanne@chromium.org

Review URL: https://codereview.chromium.org/636893002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24437 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-07 13:30:28 +00:00
titzer@chromium.org
fabb14e87f Fix bugs in lowering NumberToInt32. 
The backward propagation was different in the lowering phase versus the propagation phase, leading to some missing truncations.

R=bmeurer@chromium.org
BUG=

Review URL: https://codereview.chromium.org/638533002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24434 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-07 12:18:39 +00:00
yangguo@chromium.org
ec871585fc Add stack trace to the promise reject callback. 
R=aandrey@chromium.org
BUG=chromium:393913
LOG=N

Review URL: https://codereview.chromium.org/630373003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24432 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-07 12:03:55 +00:00
bmeurer@chromium.org
0a6e406927 Further improve hashing of pointers and integers. 
Also make sure that the appropriate functions are inlined properly
(using V8_INLINE instead of inline to enforce it even with GCC),
and improve the HashIsOkish unittest.

TEST=unittests
R=svenpanne@chromium.org

Review URL: https://codereview.chromium.org/635733002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24427 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-07 07:39:19 +00:00
bmeurer@chromium.org
e3294b1f09 [turbofan] Fix lowering of typed loads/stores. 
Only JSLoadProperty/JSStoreProperty nodes with external typed arrays can
be lowered to LoadElement/StoreElement, because lowering of non-external
typed arrays would require a map check.

TEST=cctest,unittests,mjsunit
R=svenpanne@chromium.org

Review URL: https://codereview.chromium.org/631093003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24426 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-07 07:36:21 +00:00
titzer@chromium.org
f98b7ecd4b Remove extraneous line from CompareWrapper test 
On platforms without TurboFan (PowerPC) the CompareWrapper test was
failing. It appears the line

RawMachineAssemblerTester<int32_t> m;

was causing the issue, and does not appear to be required for the
test to operate correctly. Removing it resolves the crash on non
TurboFan platforms

BUG=
R=titzer@chromium.org

Review URL: https://codereview.chromium.org/618043002

Patch from Andrew Low <andrew_low@ca.ibm.com>.

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24424 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-06 16:26:25 +00:00
erikcorry@chromium.org
d0dc7fc4da Reland: Add a use counter for Intl.v8BreakIterator 
This relands https://codereview.chromium.org/619913002/
The test has been fixed to do a GC so it does not appear to leak in
ASAN.  In addition the test has been fixed to work in the no-i18n
build, by incorporating the change from https://codereview.chromium.org/631743002/
R=ishell@chromium.org
BUG=

Review URL: https://codereview.chromium.org/628223002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24423 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-06 15:50:40 +00:00
arv@chromium.org
6708f664a9 Stage ES6 numeric literals 
BUG=
R=rossberg@chromium.org

Review URL: https://codereview.chromium.org/626153002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24421 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-06 15:40:55 +00:00
bmeurer@chromium.org
03255440de Don't use identity as hash function for integers. 
Also slightly improve hashing of floats/doubles.

TEST=unittests
R=jarin@chromium.org

Review URL: https://codereview.chromium.org/632713002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24420 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-06 15:23:59 +00:00
dcarney@chromium.org
e7a635c853 [turbofan] fix vreg mapping for instruction selector tests 
BUG=
R=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/636543002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24418 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-06 14:30:55 +00:00
jkummerow@chromium.org
b6f82c734c Remove FLAG_opt_safe_uint32_operations. 
It has been turned on by default for a long time, and hydrogenized BinaryOpStubs actually depend on it being turned on.

BUG=v8:3487
LOG=n
R=ishell@chromium.org

Review URL: https://codereview.chromium.org/630023002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24415 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-06 13:15:23 +00:00
bmeurer@chromium.org
9440b885ae Add C++11 compatible base::hash function object. 
Implement NodeCache in terms of base::hash and std::equal_to in preparation
for HeapConstant caching.

TEST=cctest,unittests
R=svenpanne@chromium.org

Review URL: https://codereview.chromium.org/624153003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24412 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-06 12:27:24 +00:00
erikcorry@chromium.org
33da50f2ea Revert Add a use counter for Intl.v8BreakIterator https://codereview.chromium.org/619913002/ 
This is due to breakage on the ASAN memory leak bot, possibly due to
pre-existing leaks in v8BreakIterator().

R=ishell@chromium.org
BUG=

Review URL: https://codereview.chromium.org/636493004

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24409 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-06 11:14:50 +00:00
m.m.capewell@googlemail.com
b662e754ae [turbofan] Negated immediates for ARM64 add/sub 
Add ARM64 instruction selector support for negating the sense of an arithmetic
instruction when its immediate is negative.

BUG=
R=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/610323004

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24407 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-06 10:39:23 +00:00
jarin@chromium.org
f40d582cf1 Revert "[turbofan] Fix lowering of typed loads/stores." 
This reverts commit r24386 for tanking asm.js benchmarks.

BUG=
R=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/634473002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24406 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-06 08:54:24 +00:00
svenpanne@chromium.org
560659e321 Test C++11 features on *all* platforms. 
R=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/630773002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24405 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-06 08:53:48 +00:00
dslomov@chromium.org
da86ab5d23 Support for super keyed loads where key is a name. 
R=arv@chromium.org, ishell@chromium.org
BUG=v8:3330
LOG=N

Review URL: https://codereview.chromium.org/622523004

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24403 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-06 08:25:27 +00:00
erikcorry@chromium.org
43257b61ae Add a use counter for Intl.v8BreakIterator 
R=marja@chromium.org
BUG=

Review URL: https://codereview.chromium.org/619913002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24400 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-03 10:29:12 +00:00
paul.lind@imgtec.com
f9b39f29fb MIPS: Add turbofan support for mips32. 
BUG=
R=bmeurer@chromium.org, dusan.milosavljevic@imgtec.com

Review URL: https://codereview.chromium.org/601723002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24397 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-02 15:48:48 +00:00
dcarney@chromium.org
c9c4b931f0 fix imul(reg, op, imm) emission on x64 
R=bmeurer@chromium.org

BUG=

Review URL: https://codereview.chromium.org/619903005

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24395 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-02 12:22:36 +00:00
yurys@chromium.org
08c40baa1f Revert of Extend CPU profiler with mapping ticks to source lines (patchset #3 id:40001 of https://codereview.chromium.org/616963005/) 
Reason for revert:
It broke layout test fast/events/window-onerror-02.html, error column reported by window.onerror is now wrong (I believe it is because of the change in full-codegen):

http://build.chromium.org/p/client.v8/builders/V8-Blink%20Linux%2064%20%28dbg%29/builds/652

Original issue's description:
> Extend CPU profiler with mapping ticks to source lines
>
> The idea behind of this solution is to use the existing "relocation info" instead of consumption the CodeLinePosition events emitted by the V8 compilers.
> During generation code and relocation info are generated simultaneously.
> When code generation is done you each code object has associated "relocation info".
> Relocation information lets V8 to mark interesting places in the generated code: the pointers that might need to be relocated (after garbage collection),
> correspondences between the machine program counter and source locations for stack walking.
>
> This patch:
> 1. Add more source positions info in reloc info to make it suitable for source level mapping.
> The amount of data should not be increased dramatically because (1) V8 already marks interesting places in the generated code and
> (2) V8 does not write redundant information (it writes a pair (pc_offset, pos) only if pos is changed and skips other).
> I measured it on Octane benchmark - for unoptimized code the number of source positions may achieve 2x ('lin_solve' from NavierStokes benchmark).
>
> 2. When a sample happens, CPU profiler finds a code object by pc, then use its reloc info to match the sample to a source line.
> If a source line is found that hit counter is increased by one for this line.
>
> 3. Add a new public V8 API to get the hit source lines by CDT CPU profiler.
> Note that it's expected a minor patch in Blink to pack the source level info in JSON to be shown.
>
> 4.Add a test that checks how the samples are distributed through source lines.
> It tests two cases: (1) relocation info created during code generation and (2) relocation info associated with precompiled function's version.
>
> Patch from Denis Pravdin <denis.pravdin@intel.com>
> BUG=None
> LOG=Y
> R=svenpanne@chromium.org
>
> Committed: https://code.google.com/p/v8/source/detail?r=24389

TBR=svenpanne@chromium.org,danno@chromium.org,alph@chromium.org,denis.pravdin@intel.com,weiliang.lin@intel.com
BUG=None
LOG=N

Review URL: https://codereview.chromium.org/624443005

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24394 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-02 11:58:21 +00:00