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PPC: Visit the Optimized Code Map on first call rather than closure creation.

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Port 9336f4cc6d

Original commit message:
    This is useful for escape analysis, and helps upcoming changes to
    type feedback gathering.

R=mvstanton@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com, bjaideep@ca.ibm.com
BUG=

Review URL: https://codereview.chromium.org/1883743004

Cr-Commit-Position: refs/heads/master@{#35461}
This commit is contained in:
mbrandy 2016-04-13 18:55:51 -07:00 committed by Commit bot
parent a9817c6846
commit d7bb46d49f
1 changed files with 140 additions and 0 deletions
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140
src/ppc/builtins-ppc.cc
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@ -1241,6 +1241,146 @@ void Builtins::Generate_InterpreterEnterBytecodeDispatch(MacroAssembler* masm) {
void Builtins::Generate_CompileLazy(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- r3 : argument count (preserved for callee)
// -- r6 : new target (preserved for callee)
// -- r4 : target function (preserved for callee)
// -----------------------------------
// First lookup code, maybe we don't need to compile!
Label gotta_call_runtime;
Label maybe_call_runtime;
Label try_shared;
Label loop_top, loop_bottom;
Register closure = r4;
Register map = r9;
Register index = r5;
__ LoadP(map,
FieldMemOperand(closure, JSFunction::kSharedFunctionInfoOffset));
__ LoadP(map,
FieldMemOperand(map, SharedFunctionInfo::kOptimizedCodeMapOffset));
__ LoadP(index, FieldMemOperand(map, FixedArray::kLengthOffset));
__ CmpSmiLiteral(index, Smi::FromInt(2), r0);
__ blt(&gotta_call_runtime);
// Find literals.
// r10 : native context
// r5 : length / index
// r9 : optimized code map
// r6 : new target
// r4 : closure
Register native_context = r10;
__ LoadP(native_context, NativeContextMemOperand());
__ bind(&loop_top);
Register temp = r11;
Register array_pointer = r8;
// Does the native context match?
__ SmiToPtrArrayOffset(array_pointer, index);
__ add(array_pointer, map, array_pointer);
__ LoadP(temp, FieldMemOperand(array_pointer,
SharedFunctionInfo::kOffsetToPreviousContext));
__ LoadP(temp, FieldMemOperand(temp, WeakCell::kValueOffset));
__ cmp(temp, native_context);
__ bne(&loop_bottom);
// OSR id set to none?
__ LoadP(temp,
FieldMemOperand(array_pointer,
SharedFunctionInfo::kOffsetToPreviousOsrAstId));
const int bailout_id = BailoutId::None().ToInt();
__ CmpSmiLiteral(temp, Smi::FromInt(bailout_id), r0);
__ bne(&loop_bottom);
// Literals available?
__ LoadP(temp,
FieldMemOperand(array_pointer,
SharedFunctionInfo::kOffsetToPreviousLiterals));
__ LoadP(temp, FieldMemOperand(temp, WeakCell::kValueOffset));
__ JumpIfSmi(temp, &gotta_call_runtime);
// Save the literals in the closure.
__ StoreP(temp, FieldMemOperand(closure, JSFunction::kLiteralsOffset), r0);
__ RecordWriteField(closure, JSFunction::kLiteralsOffset, temp, r7,
kLRHasNotBeenSaved, kDontSaveFPRegs, EMIT_REMEMBERED_SET,
OMIT_SMI_CHECK);
// Code available?
Register entry = r7;
__ LoadP(entry,
FieldMemOperand(array_pointer,
SharedFunctionInfo::kOffsetToPreviousCachedCode));
__ LoadP(entry, FieldMemOperand(entry, WeakCell::kValueOffset));
__ JumpIfSmi(entry, &maybe_call_runtime);
// Found literals and code. Get them into the closure and return.
// Store code entry in the closure.
__ addi(entry, entry, Operand(Code::kHeaderSize - kHeapObjectTag));
Label install_optimized_code_and_tailcall;
__ bind(&install_optimized_code_and_tailcall);
__ StoreP(entry, FieldMemOperand(closure, JSFunction::kCodeEntryOffset), r0);
__ RecordWriteCodeEntryField(closure, entry, r8);
// Link the closure into the optimized function list.
// r7 : code entry
// r10: native context
// r4 : closure
__ LoadP(
r8, ContextMemOperand(native_context, Context::OPTIMIZED_FUNCTIONS_LIST));
__ StoreP(r8, FieldMemOperand(closure, JSFunction::kNextFunctionLinkOffset),
r0);
__ RecordWriteField(closure, JSFunction::kNextFunctionLinkOffset, r8, temp,
kLRHasNotBeenSaved, kDontSaveFPRegs, EMIT_REMEMBERED_SET,
OMIT_SMI_CHECK);
const int function_list_offset =
Context::SlotOffset(Context::OPTIMIZED_FUNCTIONS_LIST);
__ StoreP(
closure,
ContextMemOperand(native_context, Context::OPTIMIZED_FUNCTIONS_LIST), r0);
// Save closure before the write barrier.
__ mr(r8, closure);
__ RecordWriteContextSlot(native_context, function_list_offset, r8, temp,
kLRHasNotBeenSaved, kDontSaveFPRegs);
__ JumpToJSEntry(entry);
__ bind(&loop_bottom);
__ SubSmiLiteral(index, index, Smi::FromInt(SharedFunctionInfo::kEntryLength),
r0);
__ CmpSmiLiteral(index, Smi::FromInt(1), r0);
__ bgt(&loop_top);
// We found neither literals nor code.
__ b(&gotta_call_runtime);
__ bind(&maybe_call_runtime);
// Last possibility. Check the context free optimized code map entry.
__ LoadP(entry,
FieldMemOperand(map, FixedArray::kHeaderSize +
SharedFunctionInfo::kSharedCodeIndex));
__ LoadP(entry, FieldMemOperand(entry, WeakCell::kValueOffset));
__ JumpIfSmi(entry, &try_shared);
// Store code entry in the closure.
__ addi(entry, entry, Operand(Code::kHeaderSize - kHeapObjectTag));
__ b(&install_optimized_code_and_tailcall);
__ bind(&try_shared);
// Is the full code valid?
__ LoadP(entry,
FieldMemOperand(closure, JSFunction::kSharedFunctionInfoOffset));
__ LoadP(entry, FieldMemOperand(entry, SharedFunctionInfo::kCodeOffset));
__ lwz(r8, FieldMemOperand(entry, Code::kFlagsOffset));
__ DecodeField<Code::KindField>(r8);
__ cmpi(r8, Operand(Code::BUILTIN));
__ beq(&gotta_call_runtime);
// Yes, install the full code.
__ addi(entry, entry, Operand(Code::kHeaderSize - kHeapObjectTag));
__ StoreP(entry, FieldMemOperand(closure, JSFunction::kCodeEntryOffset), r0);
__ RecordWriteCodeEntryField(closure, entry, r8);
__ JumpToJSEntry(entry);
__ bind(&gotta_call_runtime);
GenerateTailCallToReturnedCode(masm, Runtime::kCompileLazy);
}