__ cmp(result_, Operand(ip));
__ b(ne, &call_runtime_);
// Get the first of the two strings and load its instance type.
- __ ldr(object_, FieldMemOperand(object_, ConsString::kFirstOffset));
+ __ ldr(result_, FieldMemOperand(object_, ConsString::kFirstOffset));
__ jmp(&assure_seq_string);
// SlicedString, unpack and add offset.
__ bind(&sliced_string);
__ ldr(result_, FieldMemOperand(object_, SlicedString::kOffsetOffset));
__ add(scratch_, scratch_, result_);
- __ ldr(object_, FieldMemOperand(object_, SlicedString::kParentOffset));
+ __ ldr(result_, FieldMemOperand(object_, SlicedString::kParentOffset));
// Assure that we are dealing with a sequential string. Go to runtime if not.
__ bind(&assure_seq_string);
- __ ldr(result_, FieldMemOperand(object_, HeapObject::kMapOffset));
+ __ ldr(result_, FieldMemOperand(result_, HeapObject::kMapOffset));
__ ldrb(result_, FieldMemOperand(result_, Map::kInstanceTypeOffset));
// Check that parent is not an external string. Go to runtime otherwise.
STATIC_ASSERT(kSeqStringTag == 0);
__ tst(result_, Operand(kStringRepresentationMask));
__ b(ne, &call_runtime_);
+ // Actually fetch the parent string if it is confirmed to be sequential.
+ STATIC_ASSERT(SlicedString::kParentOffset == ConsString::kFirstOffset);
+ __ ldr(object_, FieldMemOperand(object_, SlicedString::kParentOffset));
// Check for 1-byte or 2-byte string.
__ bind(&flat_string);
Immediate(masm->isolate()->factory()->empty_string()));
__ j(not_equal, &call_runtime_);
// Get the first of the two strings and load its instance type.
- __ mov(object_, FieldOperand(object_, ConsString::kFirstOffset));
+ __ mov(result_, FieldOperand(object_, ConsString::kFirstOffset));
__ jmp(&assure_seq_string, Label::kNear);
// SlicedString, unpack and add offset.
__ bind(&sliced_string);
__ add(scratch_, FieldOperand(object_, SlicedString::kOffsetOffset));
- __ mov(object_, FieldOperand(object_, SlicedString::kParentOffset));
+ __ mov(result_, FieldOperand(object_, SlicedString::kParentOffset));
// Assure that we are dealing with a sequential string. Go to runtime if not.
__ bind(&assure_seq_string);
- __ mov(result_, FieldOperand(object_, HeapObject::kMapOffset));
+ __ mov(result_, FieldOperand(result_, HeapObject::kMapOffset));
__ movzx_b(result_, FieldOperand(result_, Map::kInstanceTypeOffset));
STATIC_ASSERT(kSeqStringTag == 0);
__ test(result_, Immediate(kStringRepresentationMask));
__ j(not_zero, &call_runtime_);
- __ jmp(&flat_string, Label::kNear);
+ // Actually fetch the parent string if it is confirmed to be sequential.
+ STATIC_ASSERT(SlicedString::kParentOffset == ConsString::kFirstOffset);
+ __ mov(object_, FieldOperand(object_, SlicedString::kParentOffset));
// Check for 1-byte or 2-byte string.
__ bind(&flat_string);
__ Branch(&call_runtime_, ne, result_, Operand(t0));
// Get the first of the two strings and load its instance type.
- __ lw(object_, FieldMemOperand(object_, ConsString::kFirstOffset));
+ __ lw(result_, FieldMemOperand(object_, ConsString::kFirstOffset));
__ jmp(&assure_seq_string);
// SlicedString, unpack and add offset.
__ bind(&sliced_string);
__ lw(result_, FieldMemOperand(object_, SlicedString::kOffsetOffset));
__ addu(scratch_, scratch_, result_);
- __ lw(object_, FieldMemOperand(object_, SlicedString::kParentOffset));
+ __ lw(result_, FieldMemOperand(object_, SlicedString::kParentOffset));
// Assure that we are dealing with a sequential string. Go to runtime if not.
__ bind(&assure_seq_string);
- __ lw(result_, FieldMemOperand(object_, HeapObject::kMapOffset));
+ __ lw(result_, FieldMemOperand(result_, HeapObject::kMapOffset));
__ lbu(result_, FieldMemOperand(result_, Map::kInstanceTypeOffset));
// Check that parent is not an external string. Go to runtime otherwise.
STATIC_ASSERT(kSeqStringTag == 0);
__ And(t0, result_, Operand(kStringRepresentationMask));
__ Branch(&call_runtime_, ne, t0, Operand(zero_reg));
+ // Actually fetch the parent string if it is confirmed to be sequential.
+ STATIC_ASSERT(SlicedString::kParentOffset == ConsString::kFirstOffset);
+ __ lw(object_, FieldMemOperand(object_, SlicedString::kParentOffset));
// Check for 1-byte or 2-byte string.
__ bind(&flat_string);
Heap::kEmptyStringRootIndex);
__ j(not_equal, &call_runtime_);
// Get the first of the two strings and load its instance type.
- __ movq(object_, FieldOperand(object_, ConsString::kFirstOffset));
+ ASSERT(kScratchRegister != scratch_);
+ __ movq(kScratchRegister, FieldOperand(object_, ConsString::kFirstOffset));
__ jmp(&assure_seq_string, Label::kNear);
// SlicedString, unpack and add offset.
__ bind(&sliced_string);
__ addq(scratch_, FieldOperand(object_, SlicedString::kOffsetOffset));
- __ movq(object_, FieldOperand(object_, SlicedString::kParentOffset));
+ __ movq(kScratchRegister, FieldOperand(object_, SlicedString::kParentOffset));
__ bind(&assure_seq_string);
- __ movq(result_, FieldOperand(object_, HeapObject::kMapOffset));
+ __ movq(result_, FieldOperand(kScratchRegister, HeapObject::kMapOffset));
__ movzxbl(result_, FieldOperand(result_, Map::kInstanceTypeOffset));
// If the first cons component is also non-flat, then go to runtime.
STATIC_ASSERT(kSeqStringTag == 0);
__ testb(result_, Immediate(kStringRepresentationMask));
__ j(not_zero, &call_runtime_);
- __ jmp(&flat_string);
+ __ movq(object_, kScratchRegister);
// Check for 1-byte or 2-byte string.
__ bind(&flat_string);
--- /dev/null
+// Copyright 2011 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+// * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+// * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following
+// disclaimer in the documentation and/or other materials provided
+// with the distribution.
+// * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived
+// from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Flags: --string-slices --expose-externalize-string
+
+var a = "abcdefghijklmnopqrstuvqxy"+"z";
+externalizeString(a, true);
+assertEquals('b', a.substring(1).charAt(0));
\ No newline at end of file