| // Copyright 2012 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. |
| |
| #include "v8.h" |
| |
| #if defined(V8_TARGET_ARCH_IA32) |
| |
| #include "codegen.h" |
| #include "heap.h" |
| #include "macro-assembler.h" |
| |
| namespace v8 { |
| namespace internal { |
| |
| |
| // ------------------------------------------------------------------------- |
| // Platform-specific RuntimeCallHelper functions. |
| |
| void StubRuntimeCallHelper::BeforeCall(MacroAssembler* masm) const { |
| masm->EnterFrame(StackFrame::INTERNAL); |
| ASSERT(!masm->has_frame()); |
| masm->set_has_frame(true); |
| } |
| |
| |
| void StubRuntimeCallHelper::AfterCall(MacroAssembler* masm) const { |
| masm->LeaveFrame(StackFrame::INTERNAL); |
| ASSERT(masm->has_frame()); |
| masm->set_has_frame(false); |
| } |
| |
| |
| #define __ masm. |
| |
| |
| UnaryMathFunction CreateTranscendentalFunction(TranscendentalCache::Type type) { |
| size_t actual_size; |
| // Allocate buffer in executable space. |
| byte* buffer = static_cast<byte*>(OS::Allocate(1 * KB, |
| &actual_size, |
| true)); |
| if (buffer == NULL) { |
| // Fallback to library function if function cannot be created. |
| switch (type) { |
| case TranscendentalCache::SIN: return &sin; |
| case TranscendentalCache::COS: return &cos; |
| case TranscendentalCache::TAN: return &tan; |
| case TranscendentalCache::LOG: return &log; |
| default: UNIMPLEMENTED(); |
| } |
| } |
| |
| MacroAssembler masm(NULL, buffer, static_cast<int>(actual_size)); |
| // esp[1 * kPointerSize]: raw double input |
| // esp[0 * kPointerSize]: return address |
| // Move double input into registers. |
| |
| __ push(ebx); |
| __ push(edx); |
| __ push(edi); |
| __ fld_d(Operand(esp, 4 * kPointerSize)); |
| __ mov(ebx, Operand(esp, 4 * kPointerSize)); |
| __ mov(edx, Operand(esp, 5 * kPointerSize)); |
| TranscendentalCacheStub::GenerateOperation(&masm, type); |
| // The return value is expected to be on ST(0) of the FPU stack. |
| __ pop(edi); |
| __ pop(edx); |
| __ pop(ebx); |
| __ Ret(); |
| |
| CodeDesc desc; |
| masm.GetCode(&desc); |
| ASSERT(desc.reloc_size == 0); |
| |
| CPU::FlushICache(buffer, actual_size); |
| OS::ProtectCode(buffer, actual_size); |
| return FUNCTION_CAST<UnaryMathFunction>(buffer); |
| } |
| |
| |
| UnaryMathFunction CreateSqrtFunction() { |
| size_t actual_size; |
| // Allocate buffer in executable space. |
| byte* buffer = static_cast<byte*>(OS::Allocate(1 * KB, |
| &actual_size, |
| true)); |
| // If SSE2 is not available, we can use libc's implementation to ensure |
| // consistency since code by fullcodegen's calls into runtime in that case. |
| if (buffer == NULL || !CpuFeatures::IsSupported(SSE2)) return &sqrt; |
| MacroAssembler masm(NULL, buffer, static_cast<int>(actual_size)); |
| // esp[1 * kPointerSize]: raw double input |
| // esp[0 * kPointerSize]: return address |
| // Move double input into registers. |
| { |
| CpuFeatures::Scope use_sse2(SSE2); |
| __ movdbl(xmm0, Operand(esp, 1 * kPointerSize)); |
| __ sqrtsd(xmm0, xmm0); |
| __ movdbl(Operand(esp, 1 * kPointerSize), xmm0); |
| // Load result into floating point register as return value. |
| __ fld_d(Operand(esp, 1 * kPointerSize)); |
| __ Ret(); |
| } |
| |
| CodeDesc desc; |
| masm.GetCode(&desc); |
| ASSERT(desc.reloc_size == 0); |
| |
| CPU::FlushICache(buffer, actual_size); |
| OS::ProtectCode(buffer, actual_size); |
| return FUNCTION_CAST<UnaryMathFunction>(buffer); |
| } |
| |
| |
| static void MemCopyWrapper(void* dest, const void* src, size_t size) { |
| memcpy(dest, src, size); |
| } |
| |
| |
| OS::MemCopyFunction CreateMemCopyFunction() { |
| size_t actual_size; |
| // Allocate buffer in executable space. |
| byte* buffer = static_cast<byte*>(OS::Allocate(1 * KB, |
| &actual_size, |
| true)); |
| if (buffer == NULL) return &MemCopyWrapper; |
| MacroAssembler masm(NULL, buffer, static_cast<int>(actual_size)); |
| |
| // Generated code is put into a fixed, unmovable, buffer, and not into |
| // the V8 heap. We can't, and don't, refer to any relocatable addresses |
| // (e.g. the JavaScript nan-object). |
| |
| // 32-bit C declaration function calls pass arguments on stack. |
| |
| // Stack layout: |
| // esp[12]: Third argument, size. |
| // esp[8]: Second argument, source pointer. |
| // esp[4]: First argument, destination pointer. |
| // esp[0]: return address |
| |
| const int kDestinationOffset = 1 * kPointerSize; |
| const int kSourceOffset = 2 * kPointerSize; |
| const int kSizeOffset = 3 * kPointerSize; |
| |
| int stack_offset = 0; // Update if we change the stack height. |
| |
| if (FLAG_debug_code) { |
| __ cmp(Operand(esp, kSizeOffset + stack_offset), |
| Immediate(OS::kMinComplexMemCopy)); |
| Label ok; |
| __ j(greater_equal, &ok); |
| __ int3(); |
| __ bind(&ok); |
| } |
| if (CpuFeatures::IsSupported(SSE2)) { |
| CpuFeatures::Scope enable(SSE2); |
| __ push(edi); |
| __ push(esi); |
| stack_offset += 2 * kPointerSize; |
| Register dst = edi; |
| Register src = esi; |
| Register count = ecx; |
| __ mov(dst, Operand(esp, stack_offset + kDestinationOffset)); |
| __ mov(src, Operand(esp, stack_offset + kSourceOffset)); |
| __ mov(count, Operand(esp, stack_offset + kSizeOffset)); |
| |
| |
| __ movdqu(xmm0, Operand(src, 0)); |
| __ movdqu(Operand(dst, 0), xmm0); |
| __ mov(edx, dst); |
| __ and_(edx, 0xF); |
| __ neg(edx); |
| __ add(edx, Immediate(16)); |
| __ add(dst, edx); |
| __ add(src, edx); |
| __ sub(count, edx); |
| |
| // edi is now aligned. Check if esi is also aligned. |
| Label unaligned_source; |
| __ test(src, Immediate(0x0F)); |
| __ j(not_zero, &unaligned_source); |
| { |
| // Copy loop for aligned source and destination. |
| __ mov(edx, count); |
| Register loop_count = ecx; |
| Register count = edx; |
| __ shr(loop_count, 5); |
| { |
| // Main copy loop. |
| Label loop; |
| __ bind(&loop); |
| __ prefetch(Operand(src, 0x20), 1); |
| __ movdqa(xmm0, Operand(src, 0x00)); |
| __ movdqa(xmm1, Operand(src, 0x10)); |
| __ add(src, Immediate(0x20)); |
| |
| __ movdqa(Operand(dst, 0x00), xmm0); |
| __ movdqa(Operand(dst, 0x10), xmm1); |
| __ add(dst, Immediate(0x20)); |
| |
| __ dec(loop_count); |
| __ j(not_zero, &loop); |
| } |
| |
| // At most 31 bytes to copy. |
| Label move_less_16; |
| __ test(count, Immediate(0x10)); |
| __ j(zero, &move_less_16); |
| __ movdqa(xmm0, Operand(src, 0)); |
| __ add(src, Immediate(0x10)); |
| __ movdqa(Operand(dst, 0), xmm0); |
| __ add(dst, Immediate(0x10)); |
| __ bind(&move_less_16); |
| |
| // At most 15 bytes to copy. Copy 16 bytes at end of string. |
| __ and_(count, 0xF); |
| __ movdqu(xmm0, Operand(src, count, times_1, -0x10)); |
| __ movdqu(Operand(dst, count, times_1, -0x10), xmm0); |
| |
| __ mov(eax, Operand(esp, stack_offset + kDestinationOffset)); |
| __ pop(esi); |
| __ pop(edi); |
| __ ret(0); |
| } |
| __ Align(16); |
| { |
| // Copy loop for unaligned source and aligned destination. |
| // If source is not aligned, we can't read it as efficiently. |
| __ bind(&unaligned_source); |
| __ mov(edx, ecx); |
| Register loop_count = ecx; |
| Register count = edx; |
| __ shr(loop_count, 5); |
| { |
| // Main copy loop |
| Label loop; |
| __ bind(&loop); |
| __ prefetch(Operand(src, 0x20), 1); |
| __ movdqu(xmm0, Operand(src, 0x00)); |
| __ movdqu(xmm1, Operand(src, 0x10)); |
| __ add(src, Immediate(0x20)); |
| |
| __ movdqa(Operand(dst, 0x00), xmm0); |
| __ movdqa(Operand(dst, 0x10), xmm1); |
| __ add(dst, Immediate(0x20)); |
| |
| __ dec(loop_count); |
| __ j(not_zero, &loop); |
| } |
| |
| // At most 31 bytes to copy. |
| Label move_less_16; |
| __ test(count, Immediate(0x10)); |
| __ j(zero, &move_less_16); |
| __ movdqu(xmm0, Operand(src, 0)); |
| __ add(src, Immediate(0x10)); |
| __ movdqa(Operand(dst, 0), xmm0); |
| __ add(dst, Immediate(0x10)); |
| __ bind(&move_less_16); |
| |
| // At most 15 bytes to copy. Copy 16 bytes at end of string. |
| __ and_(count, 0x0F); |
| __ movdqu(xmm0, Operand(src, count, times_1, -0x10)); |
| __ movdqu(Operand(dst, count, times_1, -0x10), xmm0); |
| |
| __ mov(eax, Operand(esp, stack_offset + kDestinationOffset)); |
| __ pop(esi); |
| __ pop(edi); |
| __ ret(0); |
| } |
| |
| } else { |
| // SSE2 not supported. Unlikely to happen in practice. |
| __ push(edi); |
| __ push(esi); |
| stack_offset += 2 * kPointerSize; |
| __ cld(); |
| Register dst = edi; |
| Register src = esi; |
| Register count = ecx; |
| __ mov(dst, Operand(esp, stack_offset + kDestinationOffset)); |
| __ mov(src, Operand(esp, stack_offset + kSourceOffset)); |
| __ mov(count, Operand(esp, stack_offset + kSizeOffset)); |
| |
| // Copy the first word. |
| __ mov(eax, Operand(src, 0)); |
| __ mov(Operand(dst, 0), eax); |
| |
| // Increment src,dstso that dst is aligned. |
| __ mov(edx, dst); |
| __ and_(edx, 0x03); |
| __ neg(edx); |
| __ add(edx, Immediate(4)); // edx = 4 - (dst & 3) |
| __ add(dst, edx); |
| __ add(src, edx); |
| __ sub(count, edx); |
| // edi is now aligned, ecx holds number of remaning bytes to copy. |
| |
| __ mov(edx, count); |
| count = edx; |
| __ shr(ecx, 2); // Make word count instead of byte count. |
| __ rep_movs(); |
| |
| // At most 3 bytes left to copy. Copy 4 bytes at end of string. |
| __ and_(count, 3); |
| __ mov(eax, Operand(src, count, times_1, -4)); |
| __ mov(Operand(dst, count, times_1, -4), eax); |
| |
| __ mov(eax, Operand(esp, stack_offset + kDestinationOffset)); |
| __ pop(esi); |
| __ pop(edi); |
| __ ret(0); |
| } |
| |
| CodeDesc desc; |
| masm.GetCode(&desc); |
| ASSERT(desc.reloc_size == 0); |
| |
| CPU::FlushICache(buffer, actual_size); |
| OS::ProtectCode(buffer, actual_size); |
| return FUNCTION_CAST<OS::MemCopyFunction>(buffer); |
| } |
| |
| #undef __ |
| |
| // ------------------------------------------------------------------------- |
| // Code generators |
| |
| #define __ ACCESS_MASM(masm) |
| |
| void ElementsTransitionGenerator::GenerateSmiOnlyToObject( |
| MacroAssembler* masm) { |
| // ----------- S t a t e ------------- |
| // -- eax : value |
| // -- ebx : target map |
| // -- ecx : key |
| // -- edx : receiver |
| // -- esp[0] : return address |
| // ----------------------------------- |
| // Set transitioned map. |
| __ mov(FieldOperand(edx, HeapObject::kMapOffset), ebx); |
| __ RecordWriteField(edx, |
| HeapObject::kMapOffset, |
| ebx, |
| edi, |
| kDontSaveFPRegs, |
| EMIT_REMEMBERED_SET, |
| OMIT_SMI_CHECK); |
| } |
| |
| |
| void ElementsTransitionGenerator::GenerateSmiOnlyToDouble( |
| MacroAssembler* masm, Label* fail) { |
| // ----------- S t a t e ------------- |
| // -- eax : value |
| // -- ebx : target map |
| // -- ecx : key |
| // -- edx : receiver |
| // -- esp[0] : return address |
| // ----------------------------------- |
| Label loop, entry, convert_hole, gc_required, only_change_map; |
| |
| // Check for empty arrays, which only require a map transition and no changes |
| // to the backing store. |
| __ mov(edi, FieldOperand(edx, JSObject::kElementsOffset)); |
| __ cmp(edi, Immediate(masm->isolate()->factory()->empty_fixed_array())); |
| __ j(equal, &only_change_map); |
| |
| __ push(eax); |
| __ push(ebx); |
| |
| __ mov(edi, FieldOperand(edi, FixedArray::kLengthOffset)); |
| |
| // Allocate new FixedDoubleArray. |
| // edx: receiver |
| // edi: length of source FixedArray (smi-tagged) |
| __ lea(esi, Operand(edi, |
| times_4, |
| FixedDoubleArray::kHeaderSize + kPointerSize)); |
| __ AllocateInNewSpace(esi, eax, ebx, no_reg, &gc_required, TAG_OBJECT); |
| |
| Label aligned, aligned_done; |
| __ test(eax, Immediate(kDoubleAlignmentMask - kHeapObjectTag)); |
| __ j(zero, &aligned, Label::kNear); |
| __ mov(FieldOperand(eax, 0), |
| Immediate(masm->isolate()->factory()->one_pointer_filler_map())); |
| __ add(eax, Immediate(kPointerSize)); |
| __ jmp(&aligned_done); |
| |
| __ bind(&aligned); |
| __ mov(Operand(eax, esi, times_1, -kPointerSize-1), |
| Immediate(masm->isolate()->factory()->one_pointer_filler_map())); |
| |
| __ bind(&aligned_done); |
| |
| // eax: destination FixedDoubleArray |
| // edi: number of elements |
| // edx: receiver |
| __ mov(FieldOperand(eax, HeapObject::kMapOffset), |
| Immediate(masm->isolate()->factory()->fixed_double_array_map())); |
| __ mov(FieldOperand(eax, FixedDoubleArray::kLengthOffset), edi); |
| __ mov(esi, FieldOperand(edx, JSObject::kElementsOffset)); |
| // Replace receiver's backing store with newly created FixedDoubleArray. |
| __ mov(FieldOperand(edx, JSObject::kElementsOffset), eax); |
| __ mov(ebx, eax); |
| __ RecordWriteField(edx, |
| JSObject::kElementsOffset, |
| ebx, |
| edi, |
| kDontSaveFPRegs, |
| EMIT_REMEMBERED_SET, |
| OMIT_SMI_CHECK); |
| |
| __ mov(edi, FieldOperand(esi, FixedArray::kLengthOffset)); |
| |
| // Prepare for conversion loop. |
| ExternalReference canonical_the_hole_nan_reference = |
| ExternalReference::address_of_the_hole_nan(); |
| XMMRegister the_hole_nan = xmm1; |
| if (CpuFeatures::IsSupported(SSE2)) { |
| CpuFeatures::Scope use_sse2(SSE2); |
| __ movdbl(the_hole_nan, |
| Operand::StaticVariable(canonical_the_hole_nan_reference)); |
| } |
| __ jmp(&entry); |
| |
| // Call into runtime if GC is required. |
| __ bind(&gc_required); |
| // Restore registers before jumping into runtime. |
| __ mov(esi, Operand(ebp, StandardFrameConstants::kContextOffset)); |
| __ pop(ebx); |
| __ pop(eax); |
| __ jmp(fail); |
| |
| // Convert and copy elements |
| // esi: source FixedArray |
| __ bind(&loop); |
| __ mov(ebx, FieldOperand(esi, edi, times_2, FixedArray::kHeaderSize)); |
| // ebx: current element from source |
| // edi: index of current element |
| __ JumpIfNotSmi(ebx, &convert_hole); |
| |
| // Normal smi, convert it to double and store. |
| __ SmiUntag(ebx); |
| if (CpuFeatures::IsSupported(SSE2)) { |
| CpuFeatures::Scope fscope(SSE2); |
| __ cvtsi2sd(xmm0, ebx); |
| __ movdbl(FieldOperand(eax, edi, times_4, FixedDoubleArray::kHeaderSize), |
| xmm0); |
| } else { |
| __ push(ebx); |
| __ fild_s(Operand(esp, 0)); |
| __ pop(ebx); |
| __ fstp_d(FieldOperand(eax, edi, times_4, FixedDoubleArray::kHeaderSize)); |
| } |
| __ jmp(&entry); |
| |
| // Found hole, store hole_nan_as_double instead. |
| __ bind(&convert_hole); |
| |
| if (FLAG_debug_code) { |
| __ cmp(ebx, masm->isolate()->factory()->the_hole_value()); |
| __ Assert(equal, "object found in smi-only array"); |
| } |
| |
| if (CpuFeatures::IsSupported(SSE2)) { |
| CpuFeatures::Scope use_sse2(SSE2); |
| __ movdbl(FieldOperand(eax, edi, times_4, FixedDoubleArray::kHeaderSize), |
| the_hole_nan); |
| } else { |
| __ fld_d(Operand::StaticVariable(canonical_the_hole_nan_reference)); |
| __ fstp_d(FieldOperand(eax, edi, times_4, FixedDoubleArray::kHeaderSize)); |
| } |
| |
| __ bind(&entry); |
| __ sub(edi, Immediate(Smi::FromInt(1))); |
| __ j(not_sign, &loop); |
| |
| __ pop(ebx); |
| __ pop(eax); |
| |
| // Restore esi. |
| __ mov(esi, Operand(ebp, StandardFrameConstants::kContextOffset)); |
| |
| __ bind(&only_change_map); |
| // eax: value |
| // ebx: target map |
| // Set transitioned map. |
| __ mov(FieldOperand(edx, HeapObject::kMapOffset), ebx); |
| __ RecordWriteField(edx, |
| HeapObject::kMapOffset, |
| ebx, |
| edi, |
| kDontSaveFPRegs, |
| OMIT_REMEMBERED_SET, |
| OMIT_SMI_CHECK); |
| } |
| |
| |
| void ElementsTransitionGenerator::GenerateDoubleToObject( |
| MacroAssembler* masm, Label* fail) { |
| // ----------- S t a t e ------------- |
| // -- eax : value |
| // -- ebx : target map |
| // -- ecx : key |
| // -- edx : receiver |
| // -- esp[0] : return address |
| // ----------------------------------- |
| Label loop, entry, convert_hole, gc_required, only_change_map, success; |
| |
| // Check for empty arrays, which only require a map transition and no changes |
| // to the backing store. |
| __ mov(edi, FieldOperand(edx, JSObject::kElementsOffset)); |
| __ cmp(edi, Immediate(masm->isolate()->factory()->empty_fixed_array())); |
| __ j(equal, &only_change_map); |
| |
| __ push(eax); |
| __ push(edx); |
| __ push(ebx); |
| |
| __ mov(ebx, FieldOperand(edi, FixedDoubleArray::kLengthOffset)); |
| |
| // Allocate new FixedArray. |
| // ebx: length of source FixedDoubleArray (smi-tagged) |
| __ lea(edi, Operand(ebx, times_2, FixedArray::kHeaderSize)); |
| __ AllocateInNewSpace(edi, eax, esi, no_reg, &gc_required, TAG_OBJECT); |
| |
| // eax: destination FixedArray |
| // ebx: number of elements |
| __ mov(FieldOperand(eax, HeapObject::kMapOffset), |
| Immediate(masm->isolate()->factory()->fixed_array_map())); |
| __ mov(FieldOperand(eax, FixedArray::kLengthOffset), ebx); |
| __ mov(edi, FieldOperand(edx, JSObject::kElementsOffset)); |
| |
| __ jmp(&entry); |
| |
| // ebx: target map |
| // edx: receiver |
| // Set transitioned map. |
| __ bind(&only_change_map); |
| __ mov(FieldOperand(edx, HeapObject::kMapOffset), ebx); |
| __ RecordWriteField(edx, |
| HeapObject::kMapOffset, |
| ebx, |
| edi, |
| kDontSaveFPRegs, |
| OMIT_REMEMBERED_SET, |
| OMIT_SMI_CHECK); |
| __ jmp(&success); |
| |
| // Call into runtime if GC is required. |
| __ bind(&gc_required); |
| __ mov(esi, Operand(ebp, StandardFrameConstants::kContextOffset)); |
| __ pop(ebx); |
| __ pop(edx); |
| __ pop(eax); |
| __ jmp(fail); |
| |
| // Box doubles into heap numbers. |
| // edi: source FixedDoubleArray |
| // eax: destination FixedArray |
| __ bind(&loop); |
| // ebx: index of current element (smi-tagged) |
| uint32_t offset = FixedDoubleArray::kHeaderSize + sizeof(kHoleNanLower32); |
| __ cmp(FieldOperand(edi, ebx, times_4, offset), Immediate(kHoleNanUpper32)); |
| __ j(equal, &convert_hole); |
| |
| // Non-hole double, copy value into a heap number. |
| __ AllocateHeapNumber(edx, esi, no_reg, &gc_required); |
| // edx: new heap number |
| if (CpuFeatures::IsSupported(SSE2)) { |
| CpuFeatures::Scope fscope(SSE2); |
| __ movdbl(xmm0, |
| FieldOperand(edi, ebx, times_4, FixedDoubleArray::kHeaderSize)); |
| __ movdbl(FieldOperand(edx, HeapNumber::kValueOffset), xmm0); |
| } else { |
| __ mov(esi, FieldOperand(edi, ebx, times_4, FixedDoubleArray::kHeaderSize)); |
| __ mov(FieldOperand(edx, HeapNumber::kValueOffset), esi); |
| __ mov(esi, FieldOperand(edi, ebx, times_4, offset)); |
| __ mov(FieldOperand(edx, HeapNumber::kValueOffset + kPointerSize), esi); |
| } |
| __ mov(FieldOperand(eax, ebx, times_2, FixedArray::kHeaderSize), edx); |
| __ mov(esi, ebx); |
| __ RecordWriteArray(eax, |
| edx, |
| esi, |
| kDontSaveFPRegs, |
| EMIT_REMEMBERED_SET, |
| OMIT_SMI_CHECK); |
| __ jmp(&entry, Label::kNear); |
| |
| // Replace the-hole NaN with the-hole pointer. |
| __ bind(&convert_hole); |
| __ mov(FieldOperand(eax, ebx, times_2, FixedArray::kHeaderSize), |
| masm->isolate()->factory()->the_hole_value()); |
| |
| __ bind(&entry); |
| __ sub(ebx, Immediate(Smi::FromInt(1))); |
| __ j(not_sign, &loop); |
| |
| __ pop(ebx); |
| __ pop(edx); |
| // ebx: target map |
| // edx: receiver |
| // Set transitioned map. |
| __ mov(FieldOperand(edx, HeapObject::kMapOffset), ebx); |
| __ RecordWriteField(edx, |
| HeapObject::kMapOffset, |
| ebx, |
| edi, |
| kDontSaveFPRegs, |
| OMIT_REMEMBERED_SET, |
| OMIT_SMI_CHECK); |
| // Replace receiver's backing store with newly created and filled FixedArray. |
| __ mov(FieldOperand(edx, JSObject::kElementsOffset), eax); |
| __ RecordWriteField(edx, |
| JSObject::kElementsOffset, |
| eax, |
| edi, |
| kDontSaveFPRegs, |
| EMIT_REMEMBERED_SET, |
| OMIT_SMI_CHECK); |
| |
| // Restore registers. |
| __ pop(eax); |
| __ mov(esi, Operand(ebp, StandardFrameConstants::kContextOffset)); |
| |
| __ bind(&success); |
| } |
| |
| |
| void StringCharLoadGenerator::Generate(MacroAssembler* masm, |
| Factory* factory, |
| Register string, |
| Register index, |
| Register result, |
| Label* call_runtime) { |
| // Fetch the instance type of the receiver into result register. |
| __ mov(result, FieldOperand(string, HeapObject::kMapOffset)); |
| __ movzx_b(result, FieldOperand(result, Map::kInstanceTypeOffset)); |
| |
| // We need special handling for indirect strings. |
| Label check_sequential; |
| __ test(result, Immediate(kIsIndirectStringMask)); |
| __ j(zero, &check_sequential, Label::kNear); |
| |
| // Dispatch on the indirect string shape: slice or cons. |
| Label cons_string; |
| __ test(result, Immediate(kSlicedNotConsMask)); |
| __ j(zero, &cons_string, Label::kNear); |
| |
| // Handle slices. |
| Label indirect_string_loaded; |
| __ mov(result, FieldOperand(string, SlicedString::kOffsetOffset)); |
| __ SmiUntag(result); |
| __ add(index, result); |
| __ mov(string, FieldOperand(string, SlicedString::kParentOffset)); |
| __ jmp(&indirect_string_loaded, Label::kNear); |
| |
| // Handle cons strings. |
| // Check whether the right hand side is the empty string (i.e. if |
| // this is really a flat string in a cons string). If that is not |
| // the case we would rather go to the runtime system now to flatten |
| // the string. |
| __ bind(&cons_string); |
| __ cmp(FieldOperand(string, ConsString::kSecondOffset), |
| Immediate(factory->empty_string())); |
| __ j(not_equal, call_runtime); |
| __ mov(string, FieldOperand(string, ConsString::kFirstOffset)); |
| |
| __ bind(&indirect_string_loaded); |
| __ mov(result, FieldOperand(string, HeapObject::kMapOffset)); |
| __ movzx_b(result, FieldOperand(result, Map::kInstanceTypeOffset)); |
| |
| // Distinguish sequential and external strings. Only these two string |
| // representations can reach here (slices and flat cons strings have been |
| // reduced to the underlying sequential or external string). |
| Label seq_string; |
| __ bind(&check_sequential); |
| STATIC_ASSERT(kSeqStringTag == 0); |
| __ test(result, Immediate(kStringRepresentationMask)); |
| __ j(zero, &seq_string, Label::kNear); |
| |
| // Handle external strings. |
| Label ascii_external, done; |
| if (FLAG_debug_code) { |
| // Assert that we do not have a cons or slice (indirect strings) here. |
| // Sequential strings have already been ruled out. |
| __ test(result, Immediate(kIsIndirectStringMask)); |
| __ Assert(zero, "external string expected, but not found"); |
| } |
| // Rule out short external strings. |
| STATIC_CHECK(kShortExternalStringTag != 0); |
| __ test_b(result, kShortExternalStringMask); |
| __ j(not_zero, call_runtime); |
| // Check encoding. |
| STATIC_ASSERT(kTwoByteStringTag == 0); |
| __ test_b(result, kStringEncodingMask); |
| __ mov(result, FieldOperand(string, ExternalString::kResourceDataOffset)); |
| __ j(not_equal, &ascii_external, Label::kNear); |
| // Two-byte string. |
| __ movzx_w(result, Operand(result, index, times_2, 0)); |
| __ jmp(&done, Label::kNear); |
| __ bind(&ascii_external); |
| // Ascii string. |
| __ movzx_b(result, Operand(result, index, times_1, 0)); |
| __ jmp(&done, Label::kNear); |
| |
| // Dispatch on the encoding: ASCII or two-byte. |
| Label ascii; |
| __ bind(&seq_string); |
| STATIC_ASSERT((kStringEncodingMask & kAsciiStringTag) != 0); |
| STATIC_ASSERT((kStringEncodingMask & kTwoByteStringTag) == 0); |
| __ test(result, Immediate(kStringEncodingMask)); |
| __ j(not_zero, &ascii, Label::kNear); |
| |
| // Two-byte string. |
| // Load the two-byte character code into the result register. |
| __ movzx_w(result, FieldOperand(string, |
| index, |
| times_2, |
| SeqTwoByteString::kHeaderSize)); |
| __ jmp(&done, Label::kNear); |
| |
| // Ascii string. |
| // Load the byte into the result register. |
| __ bind(&ascii); |
| __ movzx_b(result, FieldOperand(string, |
| index, |
| times_1, |
| SeqAsciiString::kHeaderSize)); |
| __ bind(&done); |
| } |
| |
| #undef __ |
| |
| } } // namespace v8::internal |
| |
| #endif // V8_TARGET_ARCH_IA32 |
