- 27 Jun, 2019 1 commit
-
-
Jaroslav Sevcik authored
We also introduce a subclass of AbstractBytecodeArray to allow access to the off-heap copy of bytecode array from the bytecode iterator. Note that not all bytecode iterators have been converted to iterate the off-heap copy; in particular, bytecode analysis still iterates the on-heap bytecode array. Bug: v8:7790 Change-Id: Icc1b0adb5f63d7cfe94286311f64f209067bbfd5 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1672931 Commit-Queue: Jaroslav Sevcik <jarin@chromium.org> Reviewed-by: Maya Lekova <mslekova@chromium.org> Reviewed-by: Georg Neis <neis@chromium.org> Reviewed-by: Ross McIlroy <rmcilroy@chromium.org> Cr-Commit-Position: refs/heads/master@{#62403}
-
- 19 Jun, 2019 1 commit
-
-
Jaroslav Sevcik authored
This is to allow instantiating things like bytecode array iterator for accessing both on-heap and off-heap bytecode arrays. Bug: v8:7790 Change-Id: I8dbd0884f79923d69dbc8b168d3a4a200eab14b2 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1640199 Commit-Queue: Jaroslav Sevcik <jarin@chromium.org> Reviewed-by: Ross McIlroy <rmcilroy@chromium.org> Reviewed-by: Georg Neis <neis@chromium.org> Reviewed-by: Yang Guo <yangguo@chromium.org> Reviewed-by: Maya Lekova <mslekova@chromium.org> Cr-Commit-Position: refs/heads/master@{#62266}
-
- 23 May, 2019 1 commit
-
-
Yang Guo authored
TBR=bmeurer@chromium.org,leszeks@chromium.org Bug: v8:9247 Change-Id: I8d14d0192ea8c705f8274e8e61a162531826edb6 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1624220Reviewed-by: Yang Guo <yangguo@chromium.org> Reviewed-by: Hannes Payer <hpayer@chromium.org> Reviewed-by: Andreas Haas <ahaas@chromium.org> Cr-Commit-Position: refs/heads/master@{#61769}
-
- 13 Oct, 2017 1 commit
-
-
Marja Hölttä authored
BUG=v8:5402,v8:6921 Change-Id: I96a8a7cdded6f7c37b6f1da659d63df9e3a5de2b Reviewed-on: https://chromium-review.googlesource.com/718342 Commit-Queue: Marja Hölttä <marja@chromium.org> Reviewed-by: Michael Starzinger <mstarzinger@chromium.org> Cr-Commit-Position: refs/heads/master@{#48552}
-
- 21 Nov, 2016 1 commit
-
-
leszeks authored
Refactors the bytecode array iterator to separate the iteration and the bytecode parameter access, placing the latter into a separate super-class. This will allow us to have other forms of access, e.g. reverse iteration. Review-Url: https://codereview.chromium.org/2519923002 Cr-Commit-Position: refs/heads/master@{#41152}
-
- 05 Oct, 2016 1 commit
-
-
rmcilroy authored
Also get rid of useless kMaybeReg type. BUG=v8:4280 Review-Url: https://codereview.chromium.org/2382273002 Cr-Commit-Position: refs/heads/master@{#40001}
-
- 13 Sep, 2016 1 commit
-
-
leszeks authored
Review-Url: https://codereview.chromium.org/2336203002 Cr-Commit-Position: refs/heads/master@{#39388}
-
- 15 Jul, 2016 1 commit
-
-
oth authored
> Original issue's description: > [interpreter] Reduce dependencies in bytecodes.{h,cc} > > This CL reduces the number of dependencies bytecodes.{h,cc} to facilitate > generating the bytecode peephole optimizer table during build. Specifically, > it avoids depending on v8_base. > > BUG=v8:4280 > LOG=N > > Committed: https://crrev.com/4edebb1cd870ae6c1359ad54f83e618e185883b1 > Cr-Commit-Position: refs/heads/master@{#37715} BUG=v8:4280 LOG=N Review-Url: https://codereview.chromium.org/2149093002 Cr-Commit-Position: refs/heads/master@{#37794}
-
- 14 Jul, 2016 1 commit
-
-
machenbach authored
Revert of [interpreter] Reduce dependencies in bytecodes.{h,cc} (patchset #8 id:140001 of https://codereview.chromium.org/2135273002/ ) Reason for revert: Breaks the roll, possibly win gn: https://codereview.chromium.org/2148863002/ Original issue's description: > [interpreter] Reduce dependencies in bytecodes.{h,cc} > > This CL reduces the number of dependencies bytecodes.{h,cc} to facilitate > generating the bytecode peephole optimizer table during build. Specifically, > it avoids depending on v8_base. > > BUG=v8:4280 > LOG=N > > Committed: https://crrev.com/4edebb1cd870ae6c1359ad54f83e618e185883b1 > Cr-Commit-Position: refs/heads/master@{#37715} TBR=mstarzinger@chromium.org,rmcilroy@chromium.org,oth@chromium.org # Skipping CQ checks because original CL landed less than 1 days ago. NOPRESUBMIT=true NOTREECHECKS=true NOTRY=true BUG=v8:4280 Review-Url: https://codereview.chromium.org/2151693003 Cr-Commit-Position: refs/heads/master@{#37743}
-
- 13 Jul, 2016 1 commit
-
-
oth authored
This CL reduces the number of dependencies bytecodes.{h,cc} to facilitate generating the bytecode peephole optimizer table during build. Specifically, it avoids depending on v8_base. BUG=v8:4280 LOG=N Review-Url: https://codereview.chromium.org/2135273002 Cr-Commit-Position: refs/heads/master@{#37715}
-
- 21 Jun, 2016 3 commits
-
-
rmcilroy authored
Make intrinsic ids a contiguous set of ids so that the switch statement can build a table switch rather than doing a large if/else tree. BUG=v8:4822 LOG=N Committed: https://crrev.com/36abd28a8d9932eb55d7c2bf3ad5e7cfe3eb99ea Review-Url: https://codereview.chromium.org/2084623002 Cr-Original-Commit-Position: refs/heads/master@{#37135} Cr-Commit-Position: refs/heads/master@{#37145}
-
machenbach authored
Revert of [Interpreter] Map runtime id's to intrinsic id's in InvokeIntrinsic bytecode. (patchset #3 id:40001 of https://codereview.chromium.org/2084623002/ ) Reason for revert: [Sheriff] Breaks gc stress: https://build.chromium.org/p/client.v8/builders/V8%20Linux64%20GC%20Stress%20-%20custom%20snapshot/builds/6304 Original issue's description: > [Interpreter] Map runtime id's to intrinsic id's in InvokeIntrinsic bytecode. > > Make intrinsic ids a contiguous set of ids so that the switch statement can build > a table switch rather than doing a large if/else tree. > > BUG=v8:4822 > LOG=N > > Committed: https://crrev.com/36abd28a8d9932eb55d7c2bf3ad5e7cfe3eb99ea > Cr-Commit-Position: refs/heads/master@{#37135} TBR=epertoso@chromium.org,oth@chromium.org,rmcilroy@chromium.org # Skipping CQ checks because original CL landed less than 1 days ago. NOPRESUBMIT=true NOTREECHECKS=true NOTRY=true BUG=v8:4822 Review-Url: https://codereview.chromium.org/2085823003 Cr-Commit-Position: refs/heads/master@{#37137}
-
rmcilroy authored
Make intrinsic ids a contiguous set of ids so that the switch statement can build a table switch rather than doing a large if/else tree. BUG=v8:4822 LOG=N Review-Url: https://codereview.chromium.org/2084623002 Cr-Commit-Position: refs/heads/master@{#37135}
-
- 12 May, 2016 1 commit
-
-
oth authored
This change introduces a pipeline for the final stages of bytecode generation. The peephole optimizer is made distinct from the BytecodeArrayBuilder. A new BytecodeArrayWriter is responsible for writing bytecode. It also keeps track of the maximum register seen and offers a potentially smaller frame size. R=rmcilroy@chromium.org LOG=N BUG=v8:4280 Review-Url: https://codereview.chromium.org/1947403002 Cr-Commit-Position: refs/heads/master@{#36220}
-
- 21 Mar, 2016 1 commit
-
-
oth authored
This change introduces wide prefix bytecodes to support wide (16-bit) and extra-wide (32-bit) operands. It retires the previous wide-bytecodes and reduces the number of operand types. Operands are now either scalable or fixed size. Scalable operands increase in width when a bytecode is prefixed with wide or extra-wide. The bytecode handler table is extended to 256*3 entries. The first 256 entries are used for bytecodes with 8-bit operands, the second 256 entries are used for bytecodes with operands that scale to 16-bits, and the third group of 256 entries are used for bytecodes with operands that scale to 32-bits. LOG=N BUG=v8:4747,v8:4280 Review URL: https://codereview.chromium.org/1783483002 Cr-Commit-Position: refs/heads/master@{#34955}
-
- 11 Feb, 2016 3 commits
-
-
ssanfilippo authored
Apparently, this BytecodeArrayIterator method was missed during the previous refactor. No other (collateral) change was done. BUG=v8:4280 LOG=N Review URL: https://codereview.chromium.org/1691433002 Cr-Commit-Position: refs/heads/master@{#33909}
-
machenbach authored
Revert of [Interpreter] Rename GetCountOperand to GetRegisterCountOperand. (patchset #1 id:20001 of https://codereview.chromium.org/1691433002/ ) Reason for revert: [Sheriff] Breaks the tree: https://build.chromium.org/p/client.v8/builders/V8%20Linux%20-%20builder/builds/13892 Blamelists are wrong because of overloaded master. The trybots on this CL might have been outdated by the time of commit... Please rebase and retry. Original issue's description: > [Interpreter] Rename GetCountOperand to GetRegisterCountOperand. > > Apparently, this BytecodeArrayIterator method was missed during the > previous refactor. No other (collateral) change was done. > > BUG=v8:4280 > LOG=N > > Committed: https://crrev.com/3781ca79f5c48b55d7f0bf6df370ec11515a1466 > Cr-Commit-Position: refs/heads/master@{#33897} TBR=oth@chromium.org,rmcilroy@chromium.org,mstarzinger@chromium.org,ssanfilippo@chromium.org # Skipping CQ checks because original CL landed less than 1 days ago. NOPRESUBMIT=true NOTREECHECKS=true NOTRY=true BUG=v8:4280 Review URL: https://codereview.chromium.org/1690963002 Cr-Commit-Position: refs/heads/master@{#33900}
-
ssanfilippo authored
Apparently, this BytecodeArrayIterator method was missed during the previous refactor. No other (collateral) change was done. BUG=v8:4280 LOG=N Review URL: https://codereview.chromium.org/1691433002 Cr-Commit-Position: refs/heads/master@{#33897}
-
- 03 Feb, 2016 1 commit
-
-
oth authored
Unifies the meaning of kRegCount8 and kRegCount16 across bytecodes. Call and CallJSRuntime had a slightly different use of the register count operand. From this change forth, register count operands are always based off of the previous register operand. BUG=v8:4280,v8:4675 LOG=N Review URL: https://codereview.chromium.org/1659023002 Cr-Commit-Position: refs/heads/master@{#33707}
-
- 02 Feb, 2016 1 commit
-
-
oth authored
Moves the temporary register allocator out of the bytecode array builder into TemporaryRegisterAllocator class and adds unittests. Particular must be taken around the translation window boundary motivating the addition of tests. Also adds a Clear() method to IdentityMap() which is called by the destructor. This allows classes to hold an IdentityMap if they are zone allocated. Classes must call Clear() before the zone is re-cycled or face v8 heap corruption. BUG=v8:4280,v8:4675 LOG=N Review URL: https://codereview.chromium.org/1651133002 Cr-Commit-Position: refs/heads/master@{#33686}
-
- 29 Jan, 2016 1 commit
-
-
jkummerow authored
String wrappers (new String("foo")) are special objects: their string characters are accessed like elements, and they also have an elements backing store. This used to require a bunch of explicit checks like: if (obj->IsJSValue() && JSValue::cast(obj)->value()->IsString()) { /* Handle string characters */ } // Handle regular elements (for string wrappers and other objects) obj->GetElementsAccessor()->Whatever(...); This CL introduces new ElementsKinds for string wrapper objects (one for fast elements, one for dictionary elements), which allow folding the special-casing into new StringWrapperElementsAccessors. No observable change in behavior is intended. Review URL: https://codereview.chromium.org/1612323003 Cr-Commit-Position: refs/heads/master@{#33616}
-
- 28 Jan, 2016 1 commit
-
-
rmcilroy authored
Adds --trace-ignition flag which allows tracing of bytecodes as they execute. As well as printing out the bytecode, this also prints out the input and output registers to each operation. The generated output looks as follows: -> 0x350cb46d5264 (139) : 49 fc fb 03 07 Call r4, r5, #3, [7] [ accumulator -> 0x177fba00bc99 <JS Array[2]> ] [ r4 -> 0x350cb46ce099 <JS Function InstallFunctions (SharedFunctionInfo 0x350cb46470c1)> ] [ r5 -> 0x350cb46cddc1 <an Object with map 0x35fdf590a3a9> ] [ r6 -> 0x350cb46d3f11 <JS Function Proxy (SharedFunctionInfo 0x350cb46d3e61)> ] [ r7 -> 2 ] [ accumulator <- 0x350cb4604189 <undefined> ] -> 0x350cb46d5978 (47) : 4b f8 00 00 00 CallRuntime [248], r0, #0 [ accumulator -> 0x350cb4604189 <undefined> ] [ accumulator <- 0x350cb4604189 <undefined> ] -> 0x350cb46d597d (52) : 23 09 Ldar a0 [ accumulator -> 0x350cb4604189 <undefined> ] [ a0 -> 0x350cb46d3f11 <JS Function Proxy (SharedFunctionInfo 0x350cb46d3e61)> ] [ accumulator <- 0x350cb46d3f11 <JS Function Proxy (SharedFunctionInfo 0x350cb46d3e61)> ] -> 0x350cb46d597f (54) : 24 fd Star r3 [ accumulator -> 0x350cb46d3f11 <JS Function Proxy (SharedFunctionInfo 0x350cb46d3e61)> ] [ accumulator <- 0x350cb46d3f11 <JS Function Proxy (SharedFunctionInfo 0x350cb46d3e61)> ] [ r3 <- 0x350cb46d3f11 <JS Function Proxy (SharedFunctionInfo 0x350cb46d3e61)> ] Also adds support for --print_source and --print-ast to the interpreter. BUG=v8:4280 LOG=N Review URL: https://codereview.chromium.org/1640213002 Cr-Commit-Position: refs/heads/master@{#33594}
-
- 27 Jan, 2016 1 commit
-
-
oth authored
Introduces the concept of transfer direction to register operands. This enables the register translator to emit exactly the moves that a bytecode having it's register operands translated needs. BUG=v8:4280,v8:4675 LOG=N Review URL: https://codereview.chromium.org/1633153002 Cr-Commit-Position: refs/heads/master@{#33544}
-
- 26 Jan, 2016 1 commit
-
-
oth authored
This increases the size of register operands to be 16-bit. Not all bytecodes have wide register variants, so when they are needed a register translator will copy them into a small area reserved at the top of the 8-bit register range and these registers are supplied as arguments to the bytecode with 8-bit operands. This is non-intrusive for typical bytecode where the number of registers is less than 120. For bytecodes with wide register operands (above the window) their index needs to be translated to avoid the reserved translation window. Enables splay.js to run in Octane and a handful of mjsunit tests. BUG=v8:4280,v8:4675 LOG=NO Review URL: https://codereview.chromium.org/1613163002 Cr-Commit-Position: refs/heads/master@{#33516}
-
- 19 Jan, 2016 1 commit
-
-
oth authored
o Adds wide variants of bytecodes that have operands describing ranges of registers. The upcoming wide register support does not suppport re-mapping ranges. o Adds kRegPair16 and kRegTriple16 operands required for new wide bytecodes and renames Count8/Count16 operands to RegCount8/RegCount16. o Removes Exchange bytecodes BUG=v8:4675 LOG=NO Review URL: https://codereview.chromium.org/1595103006 Cr-Commit-Position: refs/heads/master@{#33389}
-
- 18 Jan, 2016 1 commit
-
-
rmcilroy authored
Make ForInPrepare take a kRegTriple8 operand and ForInNext take kRegPair8 operand for cache state. This is to ensure that the cache state output of ForInPrepare is in consecutive registers to allow us to deopt the ForInPrepare node from TF->Ignition (to be done in a followup CL). BUG=v8:4280 LOG=N Review URL: https://codereview.chromium.org/1584813002 Cr-Commit-Position: refs/heads/master@{#33357}
-
- 08 Jan, 2016 1 commit
-
-
rmcilroy authored
Adds support for calling runtime functions which return a pair of values. Adds the bytecode CallRuntimePair. Also adds support to TurboFan for calling stubs which return multiple values. BUG=v8:4280 LOG=N Review URL: https://codereview.chromium.org/1568493002 Cr-Commit-Position: refs/heads/master@{#33181}
-
- 05 Jan, 2016 1 commit
-
-
oth authored
This increases the size of addressable constant pool entries for jumps to match other bytecodes using operands indexing the constant pool. This change also introduces reservations for constant pool entries. Reservations are used for forward jumps to ensure a constant pool entry will be available when the jump target (label) is bound and the jump is patched up in the bytecode array. BUG=v8:4280 LOG=N Review URL: https://codereview.chromium.org/1546683002 Cr-Commit-Position: refs/heads/master@{#33125}
-
- 04 Jan, 2016 1 commit
-
-
oth authored
New bytecodes for making registers with indicies wider than 1-byte accessible. BUG=v8:4280 LOG=N Review URL: https://codereview.chromium.org/1555713002 Cr-Commit-Position: refs/heads/master@{#33091}
-
- 18 Dec, 2015 1 commit
-
-
rmcilroy authored
Adds FrameState nodes to graphs built by the Bytecode Graph Builder, in preparation for adding deopt support. Also adds a new FrameStateType::kInterpretedFunction to allow for specialized deopt stack translation for interpreted frames. Finally adds support for disabling typed lowering of binary ops, since the current approach relies on a FrameState hack which does not apply to interpreted frames BUG=v8:4280 LOG=N Review URL: https://codereview.chromium.org/1514413002 Cr-Commit-Position: refs/heads/master@{#32964}
-
- 16 Dec, 2015 1 commit
-
-
oth authored
This change adds support for local control flow when building graphs from bytecode. The change ensures loop emitted from the bytecode generator are in natural order so the only back branches are for loops. BUG=v8:4280 LOG=N Review URL: https://codereview.chromium.org/1502243002 Cr-Commit-Position: refs/heads/master@{#32911}
-
- 17 Nov, 2015 1 commit
-
-
oth authored
Adds support for visiting the Call bytecode to the bytecode graph builder. This change also adds the call type feedback slot to the Call bytecode. This is not currently used by the interpreter, but is used by the graph builder. Also adds a CallWide varient of the Call bytecode, and adds the kCount16 operand type. Landed on behalf of rmcilroy. BUG=v8:4280 LOG=N Review URL: https://codereview.chromium.org/1456453002 Cr-Commit-Position: refs/heads/master@{#32033}
-
- 05 Nov, 2015 1 commit
-
-
akos.palfi authored
On MIPS arch, all memory accesses (including halfword) must be aligned to their native size or an alignment exception occurs. The kernel will fix this up, but with performance penalty. TEST=test-bytecode-generator/CallRuntime BUG= Review URL: https://codereview.chromium.org/1423373004 Cr-Commit-Position: refs/heads/master@{#31845}
-
- 04 Nov, 2015 1 commit
-
-
rmcilroy authored
Adds support for calling JS runtime functions. Also changes the bytecode array builder to allow calling functions with an invalid argument register if the call takes no arguments. Adds the bytecode CallJSRuntime. BUG=v8:4280 LOG=N Review URL: https://codereview.chromium.org/1410003003 Cr-Commit-Position: refs/heads/master@{#31774}
-
- 02 Oct, 2015 5 commits
-
-
rmcilroy authored
Adds support for calling runtime functions from the interpreter. Adds the CallRuntime bytecode which takes a Runtime::FunctionId of the function to call and the arguments in sequential registers. Adds a InterpreterCEntry builtin to enable the interpreter to enter C++ code based on the functionId. Also renames Builtin::PushArgsAndCall to Builtin::InterpreterPushArgsAndCall and groups all the interpreter builtins together. BUG=v8:4280 LOG=N Review URL: https://codereview.chromium.org/1362383002 Cr-Commit-Position: refs/heads/master@{#31089}
-
rmcilroy authored
Revert of [Interpreter] Add CallRuntime support to the interpreter. (patchset #8 id:220001 of https://codereview.chromium.org/1362383002/ ) Reason for revert: Now breaking arm32 debug bot (worked locally even with --debug-code, so I'll need to figure out what's different on the bot) Original issue's description: > [Interpreter] Add CallRuntime support to the interpreter. > > Adds support for calling runtime functions from the interpreter. Adds the > CallRuntime bytecode which takes a Runtime::FunctionId of the function to call > and the arguments in sequential registers. Adds a InterpreterCEntry builtin > to enable the interpreter to enter C++ code based on the functionId. > > Also renames Builtin::PushArgsAndCall to Builtin::InterpreterPushArgsAndCall > and groups all the interpreter builtins together. > > BUG=v8:4280 > LOG=N > TBR=bmeurer@chromium.org,oth@chromium.org,mstarzinger@chromium.org NOPRESUBMIT=true NOTREECHECKS=true NOTRY=true BUG=v8:4280 Review URL: https://codereview.chromium.org/1379933003 Cr-Commit-Position: refs/heads/master@{#31078}
-
rmcilroy authored
Adds support for calling runtime functions from the interpreter. Adds the CallRuntime bytecode which takes a Runtime::FunctionId of the function to call and the arguments in sequential registers. Adds a InterpreterCEntry builtin to enable the interpreter to enter C++ code based on the functionId. Also renames Builtin::PushArgsAndCall to Builtin::InterpreterPushArgsAndCall and groups all the interpreter builtins together. BUG=v8:4280 LOG=N Committed: https://crrev.com/40e8424b744f8b6e3e1d93e20f23487419911dfc Cr-Commit-Position: refs/heads/master@{#31064} Review URL: https://codereview.chromium.org/1362383002 Cr-Commit-Position: refs/heads/master@{#31076}
-
rmcilroy authored
Revert of [Interpreter] Add CallRuntime support to the interpreter. (patchset #6 id:180001 of https://codereview.chromium.org/1362383002/ ) Reason for revert: Broke Arm64 bot (CEntry stub is trying to pop arguments off stack when argv_in_reg, so I need to fix this). Original issue's description: > [Interpreter] Add CallRuntime support to the interpreter. > > Adds support for calling runtime functions from the interpreter. Adds the > CallRuntime bytecode which takes a Runtime::FunctionId of the function to call > and the arguments in sequential registers. Adds a InterpreterCEntry builtin > to enable the interpreter to enter C++ code based on the functionId. > > Also renames Builtin::PushArgsAndCall to Builtin::InterpreterPushArgsAndCall > and groups all the interpreter builtins together. > > BUG=v8:4280 > LOG=N > > Committed: https://crrev.com/40e8424b744f8b6e3e1d93e20f23487419911dfc > Cr-Commit-Position: refs/heads/master@{#31064} TBR=bmeurer@chromium.org,oth@chromium.org,mstarzinger@chromium.org NOPRESUBMIT=true NOTREECHECKS=true NOTRY=true BUG=v8:4280 Review URL: https://codereview.chromium.org/1387543002 Cr-Commit-Position: refs/heads/master@{#31066}
-
rmcilroy authored
Adds support for calling runtime functions from the interpreter. Adds the CallRuntime bytecode which takes a Runtime::FunctionId of the function to call and the arguments in sequential registers. Adds a InterpreterCEntry builtin to enable the interpreter to enter C++ code based on the functionId. Also renames Builtin::PushArgsAndCall to Builtin::InterpreterPushArgsAndCall and groups all the interpreter builtins together. BUG=v8:4280 LOG=N Review URL: https://codereview.chromium.org/1362383002 Cr-Commit-Position: refs/heads/master@{#31064}
-
- 01 Oct, 2015 1 commit
-
-
rmcilroy authored
Adds support for short operands, starting with kIdx16. Introduces BytecodeTraits to enable compile time determination of various traits for a bytecode, such as size, operands, etc. Reworks BytecodeIterator, BytecodeArrayBuilder and Bytecodes::Decode to support 16 bit operands. Adds support to Interpreter to load 16 bit operands. Also fixes a bug with ToBoolean where it wouldn't get emitted at the start of a block, and added a test. BytecodeTraits template magic inspired by oth@chromium.org. BUG=v8:4280 LOG=N Review URL: https://codereview.chromium.org/1370893002 Cr-Commit-Position: refs/heads/master@{#31058}
-