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Unified Diff: src/mips64/builtins-mips64.cc

Issue 1865833002: [generators] Decouple generator resume from fullcodegen. (Closed) Base URL: https://chromium.googlesource.com/v8/v8.git@master
Patch Set: Created 4 years, 8 months ago
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Index: src/mips64/builtins-mips64.cc
diff --git a/src/mips64/builtins-mips64.cc b/src/mips64/builtins-mips64.cc
index b55b77c51158bf82d61d1faf8eafcdd073a4e6c8..b086780ae36cd42488da953633efc232e18c29ba 100644
--- a/src/mips64/builtins-mips64.cc
+++ b/src/mips64/builtins-mips64.cc
@@ -690,6 +690,116 @@ void Builtins::Generate_JSBuiltinsConstructStubForDerived(
Generate_JSConstructStubHelper(masm, false, false, true);
}
+// static
+void Builtins::Generate_ResumeGeneratorTrampoline(MacroAssembler* masm) {
+ // ----------- S t a t e -------------
+ // -- v0 : the value to pass to the generator
+ // -- a1 : the JSGeneratorObject to resume
+ // -- a2 : the resume mode (tagged)
+ // -- ra : return address
+ // -----------------------------------
+ __ AssertGeneratorObject(a1);
+
+ // Store input value into generator object.
+ __ sd(v0, FieldMemOperand(a1, JSGeneratorObject::kInputOffset));
+ __ RecordWriteField(a1, JSGeneratorObject::kInputOffset, v0, a3,
+ kRAHasNotBeenSaved, kDontSaveFPRegs);
+
+ // Load suspended function and context.
+ __ ld(cp, FieldMemOperand(a1, JSGeneratorObject::kContextOffset));
+ __ ld(a4, FieldMemOperand(a1, JSGeneratorObject::kFunctionOffset));
+
+ // Flood function if we are stepping.
+ Label skip_flooding;
+ ExternalReference step_in_enabled =
+ ExternalReference::debug_step_in_enabled_address(masm->isolate());
+ __ li(t1, Operand(step_in_enabled));
+ __ lb(t1, MemOperand(t1));
+ __ Branch(&skip_flooding, eq, t1, Operand(zero_reg));
+ {
+ FrameScope scope(masm, StackFrame::INTERNAL);
+ __ Push(a1, a2, t0);
+ __ CallRuntime(Runtime::kDebugPrepareStepInIfStepping);
+ __ Pop(a1, a2);
+ __ ld(t0, FieldMemOperand(a1, JSGeneratorObject::kFunctionOffset));
+ }
+ __ bind(&skip_flooding);
+
+ // Push receiver.
+ __ ld(a5, FieldMemOperand(a1, JSGeneratorObject::kReceiverOffset));
+ __ Push(a5);
+
+ // ----------- S t a t e -------------
+ // -- a1 : the JSGeneratorObject to resume
+ // -- a2 : the resume mode (tagged)
+ // -- a4 : generator function
+ // -- cp : generator context
+ // -- ra : return address
+ // -- sp[0] : generator receiver
+ // -----------------------------------
+
+ // Push holes for arguments to generator function. Since the parser forced
+ // context allocation for any variables in generators, the actual argument
+ // values have already been copied into the context and these dummy values
+ // will never be used.
+ __ ld(a3, FieldMemOperand(a4, JSFunction::kSharedFunctionInfoOffset));
+ __ lw(a3,
+ FieldMemOperand(a3, SharedFunctionInfo::kFormalParameterCountOffset));
+ {
+ Label done_loop, loop;
+ __ bind(&loop);
+ __ Dsubu(a3, a3, Operand(1));
+ __ Branch(&done_loop, lt, a3, Operand(zero_reg));
+ __ PushRoot(Heap::kTheHoleValueRootIndex);
+ __ Branch(&loop);
+ __ bind(&done_loop);
+ }
+
+ // Enter a new JavaScript frame, and initialize its slots as they were when
+ // the generator was suspended.
+ FrameScope scope(masm, StackFrame::MANUAL);
+ __ Push(ra, fp);
+ __ Move(fp, sp);
+ __ Push(cp, a4);
+
+ // Restore the operand stack.
+ __ ld(a0, FieldMemOperand(a1, JSGeneratorObject::kOperandStackOffset));
+ __ ld(a3, FieldMemOperand(a0, FixedArray::kLengthOffset));
+ __ SmiUntag(a3);
+ __ Daddu(a0, a0, Operand(FixedArray::kHeaderSize - kHeapObjectTag));
+ __ Lsa(a3, a0, a3, kPointerSizeLog2);
+ {
+ Label done_loop, loop;
+ __ bind(&loop);
+ __ Branch(&done_loop, eq, a0, Operand(a3));
+ __ ld(a5, MemOperand(a0));
+ __ Push(a5);
+ __ Branch(USE_DELAY_SLOT, &loop);
+ __ daddiu(a0, a0, kPointerSize); // In delay slot.
+ __ bind(&done_loop);
+ }
+
+ // Push resume mode (consumed in continuation).
+ __ Push(a2);
+
+ // Reset operand stack so we don't leak.
+ __ LoadRoot(a5, Heap::kEmptyFixedArrayRootIndex);
+ __ sd(a5, FieldMemOperand(a1, JSGeneratorObject::kOperandStackOffset));
+
+ // Restore value.
+ __ ld(v0, FieldMemOperand(a1, JSGeneratorObject::kInputOffset));
+
+ // Resume the generator function at the continuation.
+ __ ld(a3, FieldMemOperand(a4, JSFunction::kSharedFunctionInfoOffset));
+ __ ld(a3, FieldMemOperand(a3, SharedFunctionInfo::kCodeOffset));
+ __ Daddu(a3, a3, Operand(Code::kHeaderSize - kHeapObjectTag));
+ __ ld(a2, FieldMemOperand(a1, JSGeneratorObject::kContinuationOffset));
+ __ SmiUntag(a2);
+ __ Daddu(a3, a3, Operand(a2));
+ __ li(a2, Operand(Smi::FromInt(JSGeneratorObject::kGeneratorExecuting)));
+ __ sd(a2, FieldMemOperand(a1, JSGeneratorObject::kContinuationOffset));
+ __ Jump(a3);
+}
void Builtins::Generate_ConstructedNonConstructable(MacroAssembler* masm) {
FrameScope scope(masm, StackFrame::INTERNAL);

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