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224 Commits

Author SHA1 Message Date
jarin@chromium.org
c7685a59f0 [turbofan] Use range types to type and lower arithmetic ops. 
This is based on Georg's work on typing arithmetic operations (https://codereview.chromium.org/658743002/).

Instead of weakening to bitset types, we weaken to the closest 2^n
limit if we see that we are re-typing a node with a range type (which
means that the node can be part of a cycle, so we might need
to speed up the fixpoint there).

BUG=
R=rossberg@chromium.org

Review URL: https://codereview.chromium.org/636283009

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24848 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-23 14:40:43 +00:00
bmeurer@chromium.org
80836787a3 [turbofan] Improve code generation for inline comparisons with zero. 
TEST=cctest,unittests
R=dcarney@chromium.org

Review URL: https://codereview.chromium.org/669133004

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24832 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-23 10:22:06 +00:00
titzer@chromium.org
5a1774268a Add Terminate operator. 
Terminate is need for non-terminating loops (NTLs) that can appear after optimizing control flow. It gathers the control and effect(s) from a NTL and connects them to end so that they are not dead-code removed.

R=mstarzinger@chromium.org
BUG=

Review URL: https://codereview.chromium.org/651843004

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24812 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-22 17:15:38 +00:00
bmeurer@chromium.org
6619a7975d [turbofan] Add support for deferred code. 
Branch can now have an optional hint, when the condition is
likely true or false, and if such a hint is present the other
basic block will be marked as deferred and placed at the end
of the function.

We currently use this feature for tagging int32/uint32 in
change lowering, and for load/store bounds checks in simplified
lowering.

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

Review URL: https://codereview.chromium.org/642883003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24802 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-22 11:24:55 +00:00
dcarney@chromium.org
1c5fafe890 [turbofan] use ZonePool in most places in the compiler pipeline a temp zone is used. 
R=jarin@chromium.org, bmeurer@chromium.org

BUG=

Review URL: https://codereview.chromium.org/663333003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24779 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-21 14:44:50 +00:00
dcarney@chromium.org
54fef44df3 [turbofan] add ZonePool to correctly track compiler phase memory usage 
R=bmeurer@chromium.org

BUG=

Review URL: https://codereview.chromium.org/665893006

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24771 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-21 12:38:46 +00:00
wingo@igalia.com
4eddbacabf Assign bailout and type feedback IDs in a post-pass 
This will allow us to move expressions from one function to another, for
example when the parser determines that a given cover grammar instance
is actually the default value initializer for an arrow function.

This is a re-land of https://codereview.chromium.org/636403003/ with a
fix for the arm64 code generator.

R=svenpanne@chromium.org
BUG=

Review URL: https://codereview.chromium.org/663373003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24769 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-21 12:16:37 +00:00
svenpanne@chromium.org
d66d302b00 Revert "Assign bailout and type feedback IDs in a post-pass" 
This reverts r24757, which breaks the ARM64 simulator build.
Simple repro:

   out/arm64.debug/d8 -e 'eval("(function(){ const x; var x; })")'

TBR=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/652543006

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24762 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-21 10:55:12 +00:00
svenpanne@chromium.org
2b8d734037 Assign bailout and type feedback IDs in a post-pass 
This will allow us to move expressions from one function to another, for
example when the parser determines that a given cover grammar instance
is actually the default value initializer for an arrow function.

R=svenpanne@chromium.org, marja@chromium.org
BUG=

Review URL: https://codereview.chromium.org/636403003

Patch from Andy Wingo <wingo@igalia.com>.

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24757 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-21 08:52:32 +00:00
dcarney@chromium.org
6c1e4f08d1 [turbofan] cleanup InstructionSequence 
R=bmeurer@chromium.org

BUG=

Review URL: https://codereview.chromium.org/664123002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24753 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-21 06:59:50 +00:00
dcarney@chromium.org
32161089da [turbofan] pass zone to InstructionSequence 
R=bmeurer@chromium.org

BUG=

Review URL: https://codereview.chromium.org/663073002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24728 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-20 11:18:07 +00:00
dcarney@chromium.org
4e191e782e [turbofan] remove schedule from InstructionSequence 
R=bmeurer@chromium.org

BUG=

Review URL: https://codereview.chromium.org/669613002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24726 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-20 10:19:15 +00:00
sigurds@chromium.org
bc475b4a6b Add inlining for intrinsics. 
This issue is for discussion on how to proceed.

I think the implementation of ValueOf shows that directly creating the IR does not scale.

BUG=
R=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/612043003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24719 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-20 07:56:50 +00:00
titzer@chromium.org
e4c6f9488e Implement graph trimming in ControlReducer. 
Trimming the graph consists of breaking links from nodes that are not reachable from end to nodes that are reachable from end. Such dead nodes show up in the use lists of the live nodes and though mostly harmless, just clutter up the graph. They also can limit instruction selection opportunities, so it is good to get rid of them.

This CL is one half of the ControlReducer functionality, the other half
being branch folding.

R=bmeurer@chromium.org
BUG=

Review URL: https://codereview.chromium.org/661923002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24694 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-17 11:51:57 +00:00
neis@chromium.org
7f7354f3fd Test monotonicity of expression typings. 
R=rossberg@chromium.org
BUG=

Review URL: https://codereview.chromium.org/653093002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24693 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-17 11:46:06 +00:00
bmeurer@chromium.org
fe3a8845f0 [turbofan] Correctify typed lowering. 
We cannot add new JSToNumber nodes here in general, because:

 a) The inserted ToNumber operation screws up observability of valueOf.
 b) Deoptimization at ToNumber doesn't have corresponding bailout id.

TEST=cctest,mjsunit
R=jarin@chromium.org

Review URL: https://codereview.chromium.org/649543004

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24660 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-16 11:31:00 +00:00
titzer@chromium.org
ad80a80a8b Fix bug in NodeCache::GetCachedNodes 
TBR=dcarney@chromium.org
BUG=

Review URL: https://codereview.chromium.org/656033003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24635 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-15 13:07:18 +00:00
titzer@chromium.org
754abff699 Add JSGraph::GetCachedNodes and NodeCache::GetCachedNodes. These routines are necessary in the dead code elimination phase to trim away uses from unreachable nodes. 
R=bmeurer@chromium.org
BUG=

Review URL: https://codereview.chromium.org/656103002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24632 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-15 12:29:39 +00:00
dcarney@chromium.org
37f1645023 [turbofan] more verification of rpo 
R=titzer@chromium.org

BUG=

Review URL: https://codereview.chromium.org/603533002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24630 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-15 12:15:38 +00:00
rossberg@chromium.org
0e16150d33 Better typing and type verification 
- Extend verifier to check types of JS and Simplified nodes.
- Untyped nodes now contain NULL as types, enforcing hard failure.
- Typer immediately installs itself as a decorator; remove explicit decorator installation.
- Decorator eagerly types all nodes that have typed inputs
  (subsumes typing of constant cache, removing its typing
  side-channel and various spurious dependencies on the typer).
- Cut down typer interface to prevent inconsistently typed graphs.
- Remove verification from start, since it caused too much trouble
  with semi-wellformed nodes.
- Fix a couple of bugs on the way that got uncovered.

To do: verifying machine operators. Also, various conditions in the
verifier are currently commented out, because they don't yet hold.

BUG=
R=jarin@chromium.org,titzer@chromium.org

Review URL: https://codereview.chromium.org/658543002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24626 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-15 11:38:04 +00:00
neis@chromium.org
93d0e79d6e Again reland "Refine expression typing, esp. by propagating range information." 
This relands commit 24552.

TBR=rossberg@chromium.org
BUG=

Review URL: https://codereview.chromium.org/650513003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24615 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-15 08:21:46 +00:00
bmeurer@chromium.org
f574d93e51 Revert "Reland "Refine expression typing, esp. by propagating range information."" 
This reverts commit r24609 for breaking the
cctest/test-js-typed-lowering/Int32BitwiseBinops test.

TBR=rossberg@chromium.org,neis@chromium.org

Review URL: https://codereview.chromium.org/656003002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24614 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-15 03:50:13 +00:00
neis@chromium.org
a7eb593147 Reland "Refine expression typing, esp. by propagating range information." 
This relands commit 24552.

R=rossberg@chromium.org
BUG=

Review URL: https://codereview.chromium.org/653693002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24609 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-14 16:27:26 +00:00
sigurds@chromium.org
4dc4b40925 Reland "Fix scheduler to correctly schedule nested diamonds". 
Reland fix: Consume less memory.

R=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/636233006

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24597 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-14 12:08:55 +00:00
bmeurer@chromium.org
81877a6440 [turbofan] Optimize division/modulus by constant. 
TEST=cctest,mjsunit,unittests
R=dcarney@chromium.org, svenpanne@chromium.org

Review URL: https://codereview.chromium.org/654833002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24595 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-14 11:57:06 +00:00
dcarney@chromium.org
75d15894f6 [turbofan] remove some of the dependency of Instruction on Schedule 
R=bmeurer@chromium.org

BUG=

Review URL: https://codereview.chromium.org/646393002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24584 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-14 08:51:22 +00:00
sigurds@chromium.org
aa67d12f09 Revert "Fix scheduler to correctly schedule nested diamonds." 
This reverts commit 0ab306041a6eba99fe5e2ef78251de137321f559.

"Fix" make scheduler run out of memory.

TBR=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/656473002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24566 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-13 16:08:29 +00:00
sigurds@chromium.org
0f5949d605 Fix scheduler to correctly schedule nested diamonds. 
The scheduler rewires control based on the last *control*
node that appears in the schedule of a block. This is not
sufficient to account for dependencies.

This patch adds additional dependencies to floating control
nodes. Given a floating control node A, every non-control
dependency of every node B that depends on A is introduces
as an additional dependency of A.

This allows the scheduler to correctly schedule two
diamonds A, B, if their only correct schedule is to
schedule B into the ifTrue successor in A.

TEST=cctest/test-scheduler/NestedFloatingDiamonds
R=mstarzinger@chromium.org, titzer@chromium.org

Review URL: https://codereview.chromium.org/602083003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24561 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-13 13:07:49 +00:00
neis@chromium.org
a2f4963abd Revert "Refine expression typing, esp. by propagating range information." 
This reverts commit 24552.

TBR=rossberg@chromium.org
BUG=

Review URL: https://codereview.chromium.org/648163002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24553 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-13 10:48:01 +00:00
neis@chromium.org
5a0ff8e656 Refine expression typing, esp. by propagating range information. 
R=rossberg@chromium.org
BUG=

Review URL: https://codereview.chromium.org/618803003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24552 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-13 10:40:29 +00:00
dcarney@chromium.org
657052e87f [turbofan] remove graph from InstructionSequence 
R=bmeurer@chromium.org

BUG=

Review URL: https://codereview.chromium.org/652643002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24545 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-13 08:09:27 +00:00
dcarney@chromium.org
907ad65dce [turbofan]IA: ChangeFloat32ToFloat64 supports mem operand 
BUG=
R=titzer@chromium.org

Review URL: https://codereview.chromium.org/641153003

Patch from Jing Bao <jing.bao@intel.com>.

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24542 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-13 07:42:35 +00:00
dcarney@chromium.org
3396c2badd [turbofan] IA: TruncateFloat64ToFloat32 supports mem operand 
BUG=
R=dcarney@chromium.org

Review URL: https://codereview.chromium.org/639283003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24541 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-13 07:12:57 +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
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
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
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
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
rodolph.perfetta@arm.com
9d3eda079e [turbofan] re-enable some tests for arm64. 
Those tests were disabled because of an issue in TruncateDoubleToI which has
been fixed since.

BUG=
R=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/605253002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24371 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-01 15:47:40 +00:00
mstarzinger@chromium.org
3bc3df9a27 Implement inlined stack-check guards in TurboFan. 
R=bmeurer@chromium.org
TEST=cctest/test-run-stackcheck/TerminateAtMethodEntry

Review URL: https://codereview.chromium.org/621833003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24367 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-01 14:03:02 +00:00
bmeurer@chromium.org
b9afcdcefb [turbofan] Add control input to Load and LoadElements. 
Also remove the now obsolete ControlEffect operator.

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

Review URL: https://codereview.chromium.org/620803003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24359 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-01 11:08:37 +00:00
dcarney@chromium.org
b3d426889d [turbofan] intel lea add multiply matchers 
R=bmeurer@chromium.org

BUG=

Review URL: https://codereview.chromium.org/614013002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24357 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-01 10:47:14 +00:00
titzer@chromium.org
c1d79db81b Rename Int32{UMod,UDiv} to Uint32{Div,Mod} and Int64{UMod,UDiv} to Uint64{Div,Mod}. 
R=bmeurer@chromium.org, mstarzinger@chromium.org
BUG=

Review URL: https://codereview.chromium.org/620773003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24356 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-01 10:39:11 +00:00
bmeurer@chromium.org
67383fe700 [turbofan] Add BoundsCheckMode to ElementAccess. 
This is currently only used for StoreElement. LoadElement will be
updated to make use of that in a follow-up CL (depends on additional
control input for loads first).

TEST=cctest,mjsunit
R=jarin@chromium.org, mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/617853002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24347 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-10-01 07:42:54 +00:00
bmeurer@chromium.org
900df59f41 Correct fix this time. 
TBR=dcarney@chromium.org

Review URL: https://codereview.chromium.org/619613003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24325 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-09-30 10:56:25 +00:00
bmeurer@chromium.org
d721ea6b9d Fix windows build after r24322. 
TBR=dcarney@chromium.org

Review URL: https://codereview.chromium.org/617803002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24324 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-09-30 10:55:02 +00:00
bmeurer@chromium.org
c1ee6247ca [turbofan] Some javascript operators are globally shared singletons. 
Also cleanup the interface, and make the parameter class/accessors
explicit to work-around the type-unsafety of OpParameter<T>.

TEST=compiler-unittests,cctest,mjsunit
R=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/613683002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24322 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
 2014-09-30 10:42:44 +00:00