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// Copyright 2012 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "src/x64/codegen-x64.h"
#if V8_TARGET_ARCH_X64
#include "src/codegen.h"
#include "src/macro-assembler.h"
#include "src/x64/assembler-x64-inl.h"
namespace v8 {
namespace internal {
#define __ masm.
UnaryMathFunctionWithIsolate CreateSqrtFunction(Isolate* isolate) {
size_t actual_size;
// Allocate buffer in executable space.
byte* buffer = static_cast<byte*>(base::OS::Allocate(
1 * KB, &actual_size, true, isolate->heap()->GetRandomMmapAddr()));
if (buffer == nullptr) return nullptr;
MacroAssembler masm(isolate, buffer, static_cast<int>(actual_size),
CodeObjectRequired::kNo);
// xmm0: raw double input.
// Move double input into registers.
__ Sqrtsd(xmm0, xmm0);
__ Ret();
CodeDesc desc;
masm.GetCode(isolate, &desc);
DCHECK(!RelocInfo::RequiresRelocation(isolate, desc));
Assembler::FlushICache(isolate, buffer, actual_size);
base::OS::ProtectCode(buffer, actual_size);
return FUNCTION_CAST<UnaryMathFunctionWithIsolate>(buffer);
}
#undef __
// -------------------------------------------------------------------------
// Code generators
#define __ ACCESS_MASM(masm)
void StringCharLoadGenerator::Generate(MacroAssembler* masm,
Register string,
Register index,
Register result,
Label* call_runtime) {
Label indirect_string_loaded;
__ bind(&indirect_string_loaded);
// Fetch the instance type of the receiver into result register.
__ movp(result, FieldOperand(string, HeapObject::kMapOffset));
__ movzxbl(result, FieldOperand(result, Map::kInstanceTypeOffset));
// We need special handling for indirect strings.
Label check_sequential;
__ testb(result, Immediate(kIsIndirectStringMask));
__ j(zero, &check_sequential, Label::kNear);
// Dispatch on the indirect string shape: slice or cons.
Label cons_string, thin_string;
__ andl(result, Immediate(kStringRepresentationMask));
__ cmpl(result, Immediate(kConsStringTag));
__ j(equal, &cons_string, Label::kNear);
__ cmpl(result, Immediate(kThinStringTag));
__ j(equal, &thin_string, Label::kNear);
// Handle slices.
__ SmiToInteger32(result, FieldOperand(string, SlicedString::kOffsetOffset));
__ addp(index, result);
__ movp(string, FieldOperand(string, SlicedString::kParentOffset));
__ jmp(&indirect_string_loaded);
// Handle thin strings.
__ bind(&thin_string);
__ movp(string, FieldOperand(string, ThinString::kActualOffset));
__ jmp(&indirect_string_loaded);
// 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);
__ CompareRoot(FieldOperand(string, ConsString::kSecondOffset),
Heap::kempty_stringRootIndex);
__ j(not_equal, call_runtime);
__ movp(string, FieldOperand(string, ConsString::kFirstOffset));
__ jmp(&indirect_string_loaded);
// 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);
__ testb(result, Immediate(kStringRepresentationMask));
__ j(zero, &seq_string, Label::kNear);
// Handle external strings.
Label one_byte_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.
__ testb(result, Immediate(kIsIndirectStringMask));
__ Assert(zero, kExternalStringExpectedButNotFound);
}
// Rule out short external strings.
STATIC_ASSERT(kShortExternalStringTag != 0);
__ testb(result, Immediate(kShortExternalStringTag));
__ j(not_zero, call_runtime);
// Check encoding.
STATIC_ASSERT(kTwoByteStringTag == 0);
__ testb(result, Immediate(kStringEncodingMask));
__ movp(result, FieldOperand(string, ExternalString::kResourceDataOffset));
__ j(not_equal, &one_byte_external, Label::kNear);
// Two-byte string.
__ movzxwl(result, Operand(result, index, times_2, 0));
__ jmp(&done, Label::kNear);
__ bind(&one_byte_external);
// One-byte string.
__ movzxbl(result, Operand(result, index, times_1, 0));
__ jmp(&done, Label::kNear);
// Dispatch on the encoding: one-byte or two-byte.
Label one_byte;
__ bind(&seq_string);
STATIC_ASSERT((kStringEncodingMask & kOneByteStringTag) != 0);
STATIC_ASSERT((kStringEncodingMask & kTwoByteStringTag) == 0);
__ testb(result, Immediate(kStringEncodingMask));
__ j(not_zero, &one_byte, Label::kNear);
// Two-byte string.
// Load the two-byte character code into the result register.
STATIC_ASSERT(kSmiTag == 0 && kSmiTagSize == 1);
__ movzxwl(result, FieldOperand(string,
index,
times_2,
SeqTwoByteString::kHeaderSize));
__ jmp(&done, Label::kNear);
// One-byte string.
// Load the byte into the result register.
__ bind(&one_byte);
__ movzxbl(result, FieldOperand(string,
index,
times_1,
SeqOneByteString::kHeaderSize));
__ bind(&done);
}
#undef __
Operand StackArgumentsAccessor::GetArgumentOperand(int index) {
DCHECK(index >= 0);
int receiver = (receiver_mode_ == ARGUMENTS_CONTAIN_RECEIVER) ? 1 : 0;
int displacement_to_last_argument = base_reg_.is(rsp) ?
kPCOnStackSize : kFPOnStackSize + kPCOnStackSize;
displacement_to_last_argument += extra_displacement_to_last_argument_;
if (argument_count_reg_.is(no_reg)) {
// argument[0] is at base_reg_ + displacement_to_last_argument +
// (argument_count_immediate_ + receiver - 1) * kPointerSize.
DCHECK(argument_count_immediate_ + receiver > 0);
return Operand(base_reg_, displacement_to_last_argument +
(argument_count_immediate_ + receiver - 1 - index) * kPointerSize);
} else {
// argument[0] is at base_reg_ + displacement_to_last_argument +
// argument_count_reg_ * times_pointer_size + (receiver - 1) * kPointerSize.
return Operand(base_reg_, argument_count_reg_, times_pointer_size,
displacement_to_last_argument + (receiver - 1 - index) * kPointerSize);
}
}
} // namespace internal
} // namespace v8
#endif // V8_TARGET_ARCH_X64
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