Commit Graph

97 Commits

Author SHA1 Message Date
danno@chromium.org
9cca7d2733 Combine typed and pixel arrays.
Worth mentioning:
- Specialized versions of pixel array and store/loads inside the generic stubs have been removed, since to have parity for all external arrays, 8 different versions would have to be inlined/checked.
- There's a new constant in v8.h for external arrays with pixel array elements.

Review URL: http://codereview.chromium.org/6546036

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@7106 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2011-03-09 15:01:16 +00:00
kmillikin@chromium.org
a05a492254 Remove class HSubgraph.
Review URL: http://codereview.chromium.org/6647018

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@7100 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2011-03-09 12:37:56 +00:00
kmillikin@chromium.org
d31594feae Refactor construction of switch statements to avoid subgraphs.
Refactor construction of switch statements so it doesn't use class
HSubgraph.

There are also a few improvements.  We do not use an auxiliary list of
comparisons because they're embedded as a linked list in the graph
under construction.  We share a common break block for all breaks from
the same switch.  We do not insert empty blocks unless necessary to
maintain edge-split form.

There is also a bug fix.  The entry to a clause body is a potential
join and must have a join ID set, otherwise deoptimization within the
body can go to an unpredictable place in the unoptimized code.

Review URL: http://codereview.chromium.org/6650021

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@7099 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2011-03-09 12:06:54 +00:00
fschneider@chromium.org
4d2c3ee82d Avoid allocation of temporary zone lists when inserting representation changes.
Instead of allocating fresh temporary lists for every instruction, reuse
the same instance and reset it between instructions.

This reduces the amount of zone memory used for inserting the HChange
instructions roughly by half.

Review URL: http://codereview.chromium.org/6628079

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@7094 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2011-03-08 15:08:36 +00:00
fschneider@chromium.org
12ba2dd435 Improve dead phi elimination.
This change splits the existing phi elimination into two phases:
1. Remove redundant phis
2. Remove dead phis with a fixed point iteration.

The new approach allows us to remove dead phis that are connected
in a cycle.

Review URL: http://codereview.chromium.org/6624061

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@7085 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2011-03-08 10:04:23 +00:00
mmaly@chromium.org
927f341d3c Strict mode arguments do not share binding with formal parameters.
Move strict mode flag from TemporaryScope to Scope so that it can be accessed from variable binding code.
Arguments do not alias in strict mode (ia32, x64 and arm, codegen and full codegen).
Hydrogen tolerates null arguments_shadow().
In codegen-<arch> arguments object is allocated eagerly to capture values before they get modified.

Review URL: http://codereview.chromium.org/6625048/

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@7083 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2011-03-07 19:23:46 +00:00
kmillikin@chromium.org
4a9056cbce Fix a stack-height mismatch during deoptimization.
When deoptimizing after a conditional expression in an effect context, we
should not see the value of the conditional expression.

BUG=v8:1237

Review URL: http://codereview.chromium.org/6625057

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@7082 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2011-03-07 17:01:12 +00:00
kmillikin@chromium.org
2662624988 Refactor inlined functions to avoid using subgraphs.
Function inlining no longer uses subgraphs.  We detect inlining in an
effect context and avoid materializing a return value earlier than we
did before.

Review URL: http://codereview.chromium.org/6635012

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@7080 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2011-03-07 15:42:23 +00:00
kmillikin@chromium.org
5c6b3ae6c6 Fix presubmit errors.
TBR=whesse

Review URL: http://codereview.chromium.org/6627049

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@7075 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2011-03-07 12:08:51 +00:00
kmillikin@chromium.org
c3172a6b7e Refactor polymorphic load and inline function graph construction.
Change the way we construct the graph for polymorphic loads to match that of
polymorphic stores.

Introduce a stack-allocated helper for saving and restoring all the
function-specific graph builder state that needs to change when we begin
translating an inlined function.  Make this class authoritative by moving
redundant state out of the builder and deferring to the current function's
state.

Ensure that we always print a tracing message when abandoning an inlining
attempt.

Review URL: http://codereview.chromium.org/6628012

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@7074 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2011-03-07 11:52:36 +00:00
fschneider@chromium.org
ff6190946c Reorganize code for range analysis and suppress unnecessary debug printing of unknown ranges.
Review URL: http://codereview.chromium.org/6611020

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@7060 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2011-03-04 12:09:54 +00:00
kmillikin@chromium.org
36f63b8476 Change the translation of polymorphic stores.
They do not use subgraphs or subgraph scopes.  Instead of computing a list
of single-block subgraphs and then adding all the edges afterward, build
both the blocks and edges directly.

Review URL: http://codereview.chromium.org/6615014

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@7058 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2011-03-04 10:07:43 +00:00
fschneider@chromium.org
db9e6dcd86 Mark HChange that convert to int32 with truncation with the appropiate flag.
Before we would compute the flag by iterating over all uses. The truncating 
flag is always determined at construction time since we already computed
the flag for all other instructions before inserting HChange instructions.

 
Review URL: http://codereview.chromium.org/6615012

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@7047 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2011-03-03 13:50:16 +00:00
kmillikin@chromium.org
84aceb526a Refactor translation of short-circuit logical operations to avoid subgraphs.
Do not use a subgraph or subgraph scope for the Hydrogen translation
of the short-circuit logical operations.

Review URL: http://codereview.chromium.org/6615010

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@7045 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2011-03-03 13:02:56 +00:00
kmillikin@chromium.org
d6a041b8f9 Remove some more uses of subgraphs and more cleanup of the graph builder.
Do not use subgraphs to implement the translation of simple branching
control flow, for the function body entry, or for labeled blocks.

Combine all the loop construction functions into a single one.

Resolve a possible problem with duplicate AST IDs used both for joined loop
break blocks, the normal loop exit, and for their common successor, by never
introducing the extra (successor) block and instead making the normal loop
exit a predecessor of the break join block.  There is a similar issue with
joined continue blocks.

Remove a (never needed) two-element zone list per each time we replace one
hydrogen value with another.

Review URL: http://codereview.chromium.org/6604002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@7027 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2011-03-02 14:09:59 +00:00
kmillikin@chromium.org
043a876e93 Translate loops without using subgraphs.
Build all loop graphs without using class HSubgraph.  This also eliminates a
silly goto for the update expression of a for loop.

Support for peeling loops is removed because it's currently untested.

Review URL: http://codereview.chromium.org/6602031

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@7017 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2011-03-02 11:09:25 +00:00
kmillikin@chromium.org
6b1530ea6d Fix a stack height mismatch when deoptimizing.
When deoptimizing from the key subexpression of a keyed arguments access,
the unoptimized code expects to find the value of the receiver on the
expression stack.  The environment of the optimizing compiler did not
contain this value during evaluation of the key subexpression.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6981 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2011-03-01 09:32:45 +00:00
kmillikin@chromium.org
ee2659d4e6 Remove all functionality from class HSubgraph.
Move the member functions of HSubgraph to HGraphBuilder.

Review URL: http://codereview.chromium.org/6573006

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6958 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2011-02-28 08:52:00 +00:00
lrn@chromium.org
485f4ea0d9 Clear exceptions set during attempts to lazily optimize.
Resubmit of patch for issue 1145 with a few additions:
- Now also clears exceptions when calling Runtime_LazyRecompile.
- Sets function where parsing fails to not be optimizable.

BUG=v8:1145
TEST=test/mjsunit/regress/regress-1145.js

Review URL: http://codereview.chromium.org/6469050

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6945 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2011-02-25 11:17:31 +00:00
fschneider@chromium.org
bdcf0ec270 Fix debug tracing of live ranges and remove unused code.
When printing the sub-parts of a live range, only print the use intervals
belonging to each part.

Add a flag to print all use positions (incl. environment uses)


Review URL: http://codereview.chromium.org/6566005

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6917 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2011-02-23 15:25:04 +00:00
kmillikin@chromium.org
791c9e2c21 Remove most uses of HSubgraph as an argument.
In a lot of cases where we were passing a subgraph (a pair of basic blocks),
we actually only needed a basic block.

Review URL: http://codereview.chromium.org/6570006

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6913 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2011-02-23 11:59:18 +00:00
fschneider@chromium.org
288b4fb8f4 HIR refactoring.
Review URL: http://codereview.chromium.org/6538080

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6910 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2011-02-23 11:19:50 +00:00
rossberg@chromium.org
3af35dc96f Optimize functions needing a local context.
Allocate the context in the prologue. Two issues had to be solved:
(1) deoptimization needs to handle functions with a local context,
(2) we need a safepoint in the prologue.
(Thanks to Kevin.)

Review URL: http://codereview.chromium.org/6534022

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6903 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2011-02-22 16:56:57 +00:00
mikhail.naganov@gmail.com
56788625b6 Fix CPU profiling for Crankshaft.
The main issue was due to multiple recompilations of functions.  Now
code objects are grouped by function using SFI object address.
JSFunction objects are no longer tracked, instead we track SFI object
moves. To pick a correct code version, we now sample return addresses
instead of JSFunction addresses.

tools/{linux|mac|windows}-tickprocessor scripts differentiate
between code optimization states for the same function
(using * and ~ prefixes introduced earlier).

DevTools CPU profiler treats all variants of function code as
a single function.

ll_prof treats each optimized variant as a separate entry, because
it can disassemble each one of them.

tickprocessor.py not updated -- it is deprecated and will be removed.

BUG=v8/1087,b/3178160
TEST=all existing tests pass, including Chromium layout tests

Review URL: http://codereview.chromium.org/6551011

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6902 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2011-02-22 16:31:24 +00:00
kmillikin@chromium.org
3c02d036a8 Partial refactoring of subgraphs.
Change the interface to the Hydrogen graph builder to appear like it
directly holds a current basic block and a current environment.
Remove some direct accesses to the current subgraph, and remove
subgraph accessors that simply forwarded to the exit block.

Review URL: http://codereview.chromium.org/6532088

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6887 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2011-02-22 10:32:16 +00:00
kmillikin@chromium.org
14e185b31b Change the translation of break/continue into Hydrogen.
Resolve break and continue when we see them, rather then deferring
them until later.

Review URL: http://codereview.chromium.org/6541060

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6878 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2011-02-22 08:40:10 +00:00
kmillikin@chromium.org
663da3df40 Fix presubmit failure.
TBR=ager@chromium.org

Review URL: http://codereview.chromium.org/6552001

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6877 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2011-02-22 06:41:32 +00:00
kmillikin@chromium.org
c1386c3381 Shorten live ranges for arguments to runtime calls.
Before, the live ranges of the arguments extended to the call itself, and
they were pushed immediately before the call.  Now, they are spilled eagerly
as soon as their value is available and they are spilled to the right place.

The inlined runtime calls in the optimized backend are changed to work as in
all the other backends: they get their arguments untranslated and can choose
their own custom evaluation order.

Review URL: http://codereview.chromium.org/6526047

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6876 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2011-02-22 06:25:01 +00:00
kmillikin@chromium.org
b02107284a Fix incorrect deoptimization for logical not in an effect context.
The baseline compiler does not materialize a value for expressions of
the form !expr in an effect context so the graph translation should
not produce such an environment, otherwise we risk targeting it by
deoptimization.

BUG=v8:1167

Review URL: http://codereview.chromium.org/6537018

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6833 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2011-02-17 13:05:49 +00:00
kmillikin@chromium.org
82cdd48b2f Fix a bug in deoptimization after logical expressions in an effect context.
When deoptimizing to after an expression of the form (expr0 || expr1)
or (expr0 && expr1) in an effect context, the unoptimized code could
incorrectly see the value of the expression.

Handle the short-circuit binary operators specially in effect contexts.
This fixes the issue and will generate better code when the left
subexpression is boolean-valued.

BUG=v8:1166

Review URL: http://codereview.chromium.org/6519046

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6831 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2011-02-17 11:06:50 +00:00
danno@chromium.org
181bdc5f06 Fix syntax error, feel sheepish.
Review URL: http://codereview.chromium.org/6525052

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6822 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2011-02-16 13:59:26 +00:00
danno@chromium.org
e8c012c99a Fix presubmit problem.
Review URL: http://codereview.chromium.org/6526048

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6820 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2011-02-16 13:52:46 +00:00
danno@chromium.org
12b4e0efe7 Implement crankshaft support for pixel array stores.
Review URL: http://codereview.chromium.org/6528013

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6817 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2011-02-16 13:31:12 +00:00
karlklose@chromium.org
7de60ef84d ARM: Implement GetCachedArrayIndex in the lithium code generator.
Add GetCachedArrayIndex to the Hydrogen instruction set and implement GetCachedArrayIndex in the lithium code generator. The x64 and ia32 code generators implementations abort in the chunk builder.

Review URL: http://codereview.chromium.org/6499014

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6803 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2011-02-16 08:21:45 +00:00
rossberg@chromium.org
ae8c5defbc Enable compound assignment to context slots.
Review URL: http://codereview.chromium.org/6523025

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6798 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2011-02-15 16:37:40 +00:00
kmillikin@chromium.org
f2e38c6276 Refactor construction of polymorphic loads, stores, and calls.
Rather than passing in a pair of unequal-length lists, pass the default
subgraph separately.  Construct the typecase from the top down rather than
the bottom up, so it doesn't need an intermediate zone list.

Also, change a basic block's 'last' instruction field to really be its last
instruction by correctly updating it when inserting and removing
instructions.

Review URL: http://codereview.chromium.org/6516016

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6783 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2011-02-15 07:58:04 +00:00
fschneider@chromium.org
9bbb257b02 Small cleanup of unused code in hydrogen IR.
Review URL: http://codereview.chromium.org/6513008

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6763 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2011-02-14 09:23:26 +00:00
fschneider@chromium.org
56f6cbbeae Revert r6748.
I'm seeing some crashes after this change which I need to investigate.

Review URL: http://codereview.chromium.org/6486033

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6755 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2011-02-11 14:34:02 +00:00
antonm@chromium.org
e96c24bf03 Properly treat exceptions thrown while compiling.
BUG=v8:1132
TEST=test/mjsunit/regress/regress-1132.js

Review URL: http://codereview.chromium.org/6487021

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6754 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2011-02-11 14:26:56 +00:00
kmillikin@chromium.org
3ef7ca6c28 Remove the uses of the arguments from all calls.
Before, Hydrogen call instructions had uses of the PushArgument instructions
for their arguments.  These operands were unneeded, bloated the IR, and
caused calls to be the only Hydrogen instructions with an unpredictable
number of operands.

Now, PushArgument is a pure side-effecting instruction that has no uses.

Review URL: http://codereview.chromium.org/6480030

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6749 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2011-02-11 13:20:06 +00:00
fschneider@chromium.org
bbba0dbd61 Add a genuine unary minus instruction to Crankshaft.
This change introduces an instruction for negation instead
of generating a multiplication with -1.

The code for x64 and ARM is not included in this change.


Review URL: http://codereview.chromium.org/6461021

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6748 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2011-02-11 12:56:30 +00:00
kmillikin@chromium.org
2e08148b06 Fix the semantics of delete on parameters.
Before, an attempt to delete a parameter in a function that used the
arguments object in any way would succeed with true and delete both
the parameter and the corresponding arguments object property.

Now, an attempt to delete such a parameter does not delete and
evaluates to false.

Parameters can be deleted, as before, from functions that use the
arguments object, by deleting the corresponding arguments object
property (this is a spec violation).

BUG=fixes v8:1136

Review URL: http://codereview.chromium.org/6484023

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6745 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2011-02-11 11:57:11 +00:00
danno@chromium.org
1bd9f602be Implement crankshaft support for pixel array loads.
Review URL: http://codereview.chromium.org/6410112

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6725 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2011-02-10 12:02:36 +00:00
kmillikin@chromium.org
c0fd053982 Fix a representation change bug in the Hydrogen graph construction.
We could try to treat an HPhi as an HInstruction because the code did
not properly handle the case of a phi in a block with itself as one of
the predecessors.

BUG=v8:1134

Review URL: http://codereview.chromium.org/6471020

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6721 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2011-02-10 10:28:59 +00:00
kmillikin@chromium.org
e88f25f6dc Insert a space to please our presubmit overlords.
Review URL: http://codereview.chromium.org/6480027

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6715 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2011-02-10 09:16:33 +00:00
kmillikin@chromium.org
ebebcae4c2 Allow esi to be an allocatable register on IA32.
Make esi available to the register allocator rather than dedicating it
permanently to the context.

The context is still passed in register esi to JavaScript and to the runtime
as part of the calling convention.  Because some stubs might end up calling
JS or the runtime, it is also conservatively passed to stubs.

Roughly half the calls have been modified to use the context as an input
value in fixed register esi.  The other half are marked as calls or deferred
code so esi is spilled and can be explicitly set.

It is no longer necessary to restore the context to esi after a call that
might change it.

Review URL: http://codereview.chromium.org/6452001

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6713 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2011-02-10 09:00:50 +00:00
kmillikin@chromium.org
991a1cae12 Fix an assertion failure in stack trace construction.
When constructing stack traces we interpret the deoptimization data for
optimized frames to find the receiver value.  This value could sometimes be
eliminated from the deoptimization data if we though it was unused.

BUG=v8:1118

Review URL: http://codereview.chromium.org/6465023

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6694 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2011-02-09 11:45:50 +00:00
whesse@chromium.org
39c855bd48 Bailout from crankshaft if a global property is found in the prototype chain of the global object, not on the global object itself.
Review URL: http://codereview.chromium.org/6449002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6678 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2011-02-08 13:28:09 +00:00
vegorov@chromium.org
76cf30d9c8 Support %_IsConstructCall in the Crankshaft pipeline.
Provide special case for f.bind(obj).

Review URL: http://codereview.chromium.org/6368138

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6671 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2011-02-08 10:08:47 +00:00
kmillikin@chromium.org
97ccdd1e99 Introduce a hydrogen value for contexts, support context slot assignment.
Each context in the context chain has a corresponding hydrogen value.
The context values are used for global object lookup and context slot
lookup.  Add simple (non-compound) assignment to context slots.

Review URL: http://codereview.chromium.org/6390003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6615 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2011-02-03 13:10:28 +00:00