}
+class DeferredSwapElements: public DeferredCode {
+ public:
+ DeferredSwapElements(Register object, Register index1, Register index2)
+ : object_(object), index1_(index1), index2_(index2) {
+ set_comment("[ DeferredSwapElements");
+ }
+
+ virtual void Generate();
+
+ private:
+ Register object_, index1_, index2_;
+};
+
+
+void DeferredSwapElements::Generate() {
+ __ push(object_);
+ __ push(index1_);
+ __ push(index2_);
+ __ CallRuntime(Runtime::kSwapElements, 3);
+}
+
+
void CodeGenerator::GenerateSwapElements(ZoneList<Expression*>* args) {
Comment cmnt(masm_, "[ GenerateSwapElements");
Load(args->at(1));
Load(args->at(2));
- frame_->CallRuntime(Runtime::kSwapElements, 3);
- frame_->EmitPush(r0);
+ Register index2 = r2;
+ Register index1 = r1;
+ Register object = r0;
+ Register tmp1 = r3;
+ Register tmp2 = r4;
+
+ frame_->EmitPop(index2);
+ frame_->EmitPop(index1);
+ frame_->EmitPop(object);
+
+ DeferredSwapElements* deferred =
+ new DeferredSwapElements(object, index1, index2);
+
+ // Fetch the map and check if array is in fast case.
+ // Check that object doesn't require security checks and
+ // has no indexed interceptor.
+ __ CompareObjectType(object, tmp1, tmp2, FIRST_JS_OBJECT_TYPE);
+ deferred->Branch(lt);
+ __ ldrb(tmp2, FieldMemOperand(tmp1, Map::kBitFieldOffset));
+ __ tst(tmp2, Operand(KeyedLoadIC::kSlowCaseBitFieldMask));
+ deferred->Branch(nz);
+
+ // Check the object's elements are in fast case.
+ __ ldr(tmp1, FieldMemOperand(object, JSObject::kElementsOffset));
+ __ ldr(tmp2, FieldMemOperand(tmp1, HeapObject::kMapOffset));
+ __ LoadRoot(ip, Heap::kFixedArrayMapRootIndex);
+ __ cmp(tmp2, ip);
+ deferred->Branch(ne);
+
+ // Smi-tagging is equivalent to multiplying by 2.
+ STATIC_ASSERT(kSmiTag == 0);
+ STATIC_ASSERT(kSmiTagSize == 1);
+
+ // Check that both indices are smis.
+ __ mov(tmp2, index1);
+ __ orr(tmp2, tmp2, index2);
+ __ tst(tmp2, Operand(kSmiTagMask));
+ deferred->Branch(nz);
+
+ // Bring the offsets into the fixed array in tmp1 into index1 and
+ // index2.
+ __ mov(tmp2, Operand(FixedArray::kHeaderSize - kHeapObjectTag));
+ __ add(index1, tmp2, Operand(index1, LSL, kPointerSizeLog2 - kSmiTagSize));
+ __ add(index2, tmp2, Operand(index2, LSL, kPointerSizeLog2 - kSmiTagSize));
+
+ // Swap elements.
+ Register tmp3 = object;
+ object = no_reg;
+ __ ldr(tmp3, MemOperand(tmp1, index1));
+ __ ldr(tmp2, MemOperand(tmp1, index2));
+ __ str(tmp3, MemOperand(tmp1, index2));
+ __ str(tmp2, MemOperand(tmp1, index1));
+
+ Label done;
+ __ InNewSpace(tmp1, tmp2, eq, &done);
+ // Possible optimization: do a check that both values are Smis
+ // (or them and test against Smi mask.)
+
+ __ mov(tmp2, tmp1);
+ RecordWriteStub recordWrite1(tmp1, index1, tmp3);
+ __ CallStub(&recordWrite1);
+
+ RecordWriteStub recordWrite2(tmp2, index2, tmp3);
+ __ CallStub(&recordWrite2);
+
+ __ bind(&done);
+
+ deferred->BindExit();
+ __ LoadRoot(tmp1, Heap::kUndefinedValueRootIndex);
+ frame_->EmitPush(tmp1);
}
}
+void RecordWriteStub::Generate(MacroAssembler* masm) {
+ __ RecordWriteHelper(object_, offset_, scratch_);
+ __ Ret();
+}
+
+
// On entry r0 (rhs) and r1 (lhs) are the values to be compared.
// On exit r0 is 0, positive or negative to indicate the result of
// the comparison.
};
+class RecordWriteStub : public CodeStub {
+ public:
+ RecordWriteStub(Register object, Register offset, Register scratch)
+ : object_(object), offset_(offset), scratch_(scratch) { }
+
+ void Generate(MacroAssembler* masm);
+
+ private:
+ Register object_;
+ Register offset_;
+ Register scratch_;
+
+#ifdef DEBUG
+ void Print() {
+ PrintF("RecordWriteStub (object reg %d), (offset reg %d),"
+ " (scratch reg %d)\n",
+ object_.code(), offset_.code(), scratch_.code());
+ }
+#endif
+
+ // Minor key encoding in 12 bits. 4 bits for each of the three
+ // registers (object, offset and scratch) OOOOAAAASSSS.
+ class ScratchBits: public BitField<uint32_t, 0, 4> {};
+ class OffsetBits: public BitField<uint32_t, 4, 4> {};
+ class ObjectBits: public BitField<uint32_t, 8, 4> {};
+
+ Major MajorKey() { return RecordWrite; }
+
+ int MinorKey() {
+ // Encode the registers.
+ return ObjectBits::encode(object_.code()) |
+ OffsetBits::encode(offset_.code()) |
+ ScratchBits::encode(scratch_.code());
+ }
+};
+
+
} } // namespace v8::internal
#endif // V8_ARM_CODEGEN_ARM_H_
}
-// Will clobber 4 registers: object, offset, scratch, ip. The
-// register 'object' contains a heap object pointer. The heap object
-// tag is shifted away.
-void MacroAssembler::RecordWrite(Register object, Register offset,
- Register scratch) {
- // The compiled code assumes that record write doesn't change the
- // context register, so we check that none of the clobbered
- // registers are cp.
- ASSERT(!object.is(cp) && !offset.is(cp) && !scratch.is(cp));
+void MacroAssembler::RecordWriteHelper(Register object,
+ Register offset,
+ Register scratch) {
+ if (FLAG_debug_code) {
+ // Check that the object is not in new space.
+ Label not_in_new_space;
+ InNewSpace(object, scratch, ne, ¬_in_new_space);
+ Abort("new-space object passed to RecordWriteHelper");
+ bind(¬_in_new_space);
+ }
// This is how much we shift the remembered set bit offset to get the
// offset of the word in the remembered set. We divide by kBitsPerInt (32,
// shift right 5) and then multiply by kIntSize (4, shift left 2).
const int kRSetWordShift = 3;
- Label fast, done;
-
- // First, test that the object is not in the new space. We cannot set
- // remembered set bits in the new space.
- // object: heap object pointer (with tag)
- // offset: offset to store location from the object
- and_(scratch, object, Operand(ExternalReference::new_space_mask()));
- cmp(scratch, Operand(ExternalReference::new_space_start()));
- b(eq, &done);
+ Label fast;
// Compute the bit offset in the remembered set.
// object: heap object pointer (with tag)
mov(ip, Operand(1));
orr(scratch, scratch, Operand(ip, LSL, offset));
str(scratch, MemOperand(object));
+}
+
+
+void MacroAssembler::InNewSpace(Register object,
+ Register scratch,
+ Condition cc,
+ Label* branch) {
+ ASSERT(cc == eq || cc == ne);
+ and_(scratch, object, Operand(ExternalReference::new_space_mask()));
+ cmp(scratch, Operand(ExternalReference::new_space_start()));
+ b(cc, branch);
+}
+
+
+// Will clobber 4 registers: object, offset, scratch, ip. The
+// register 'object' contains a heap object pointer. The heap object
+// tag is shifted away.
+void MacroAssembler::RecordWrite(Register object, Register offset,
+ Register scratch) {
+ // The compiled code assumes that record write doesn't change the
+ // context register, so we check that none of the clobbered
+ // registers are cp.
+ ASSERT(!object.is(cp) && !offset.is(cp) && !scratch.is(cp));
+
+ Label done;
+
+ // First, test that the object is not in the new space. We cannot set
+ // remembered set bits in the new space.
+ InNewSpace(object, scratch, eq, &done);
+
+ // Record the actual write.
+ RecordWriteHelper(object, offset, scratch);
bind(&done);
Heap::RootListIndex index,
Condition cond = al);
+
+ // Check if object is in new space.
+ // scratch can be object itself, but it will be clobbered.
+ void InNewSpace(Register object,
+ Register scratch,
+ Condition cc, // eq for new space, ne otherwise
+ Label* branch);
+
+
+ // Set the remebered set bit for an offset into an
+ // object. RecordWriteHelper only works if the object is not in new
+ // space.
+ void RecordWriteHelper(Register object, Register offset, Register scracth);
+
// Sets the remembered set bit for [address+offset], where address is the
// address of the heap object 'object'. The address must be in the first 8K
// of an allocated page. The 'scratch' register is used in the
}
#endif
- // Minor key encoding in 12 bits of three registers (object, address and
- // scratch) OOOOAAAASSSS.
+ // Minor key encoding in 12 bits. 4 bits for each of the three
+ // registers (object, address and scratch) OOOOAAAASSSS.
class ScratchBits: public BitField<uint32_t, 0, 4> {};
class AddressBits: public BitField<uint32_t, 4, 4> {};
class ObjectBits: public BitField<uint32_t, 8, 4> {};
void MacroAssembler::RecordWriteHelper(Register object,
Register addr,
Register scratch) {
+ if (FLAG_debug_code) {
+ // Check that the object is not in new space.
+ Label not_in_new_space;
+ InNewSpace(object, scratch, not_equal, ¬_in_new_space);
+ Abort("new-space object passed to RecordWriteHelper");
+ bind(¬_in_new_space);
+ }
+
Label fast;
// Compute the page start address from the heap object pointer, and reuse
// First, check if a remembered set write is even needed. The tests below
// catch stores of Smis and stores into young gen (which does not have space
- // for the remembered set bits.
+ // for the remembered set bits).
Label done;
// Skip barrier if writing a smi.
// ---------------------------------------------------------------------------
// GC Support
-
+ // Set the remebered set bit for an address which points into an
+ // object. RecordWriteHelper only works if the object is not in new
+ // space.
void RecordWriteHelper(Register object,
Register addr,
Register scratch);
}
#endif
- // Minor key encoding in 12 bits of three registers (object, address and
- // scratch) OOOOAAAASSSS.
+ // Minor key encoding in 12 bits. 4 bits for each of the three
+ // registers (object, address and scratch) OOOOAAAASSSS.
class ScratchBits : public BitField<uint32_t, 0, 4> {};
class AddressBits : public BitField<uint32_t, 4, 4> {};
class ObjectBits : public BitField<uint32_t, 8, 4> {};
void MacroAssembler::RecordWriteHelper(Register object,
Register addr,
Register scratch) {
+ if (FLAG_debug_code) {
+ // Check that the object is not in new space.
+ Label not_in_new_space;
+ InNewSpace(object, scratch, not_equal, ¬_in_new_space);
+ Abort("new-space object passed to RecordWriteHelper");
+ bind(¬_in_new_space);
+ }
+
Label fast;
// Compute the page start address from the heap object pointer, and reuse
// First, check if a remembered set write is even needed. The tests below
// catch stores of Smis and stores into young gen (which does not have space
- // for the remembered set bits.
+ // for the remembered set bits).
Label done;
JumpIfSmi(value, &done);
// ---------------------------------------------------------------------------
// GC Support
+ // Set the remebered set bit for an address which points into an
+ // object. RecordWriteHelper only works if the object is not in new
+ // space.
void RecordWriteHelper(Register object,
Register addr,
Register scratch);
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