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v8/src/ia32/codegen-ia32.cc

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// 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(!RelocInfo::RequiresRelocation(desc));
CPU::FlushICache(buffer, actual_size);
OS::ProtectCode(buffer, actual_size);
return FUNCTION_CAST<UnaryMathFunction>(buffer);
}
UnaryMathFunction CreateExpFunction() {
if (!CpuFeatures::IsSupported(SSE2)) return &exp;
if (!FLAG_fast_math) return &exp;
size_t actual_size;
byte* buffer = static_cast<byte*>(OS::Allocate(1 * KB, &actual_size, true));
if (buffer == NULL) return &exp;
ExternalReference::InitializeMathExpData();
MacroAssembler masm(NULL, buffer, static_cast<int>(actual_size));
// esp[1 * kPointerSize]: raw double input
// esp[0 * kPointerSize]: return address
{
CpuFeatureScope use_sse2(&masm, SSE2);
XMMRegister input = xmm1;
XMMRegister result = xmm2;
__ movdbl(input, Operand(esp, 1 * kPointerSize));
__ push(eax);
__ push(ebx);
MathExpGenerator::EmitMathExp(&masm, input, result, xmm0, eax, ebx);
__ pop(ebx);
__ pop(eax);
__ movdbl(Operand(esp, 1 * kPointerSize), result);
__ fld_d(Operand(esp, 1 * kPointerSize));
__ Ret();
}
CodeDesc desc;
masm.GetCode(&desc);
ASSERT(!RelocInfo::RequiresRelocation(desc));
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.
{
CpuFeatureScope use_sse2(&masm, 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(!RelocInfo::RequiresRelocation(desc));
CPU::FlushICache(buffer, actual_size);
OS::ProtectCode(buffer, actual_size);
return FUNCTION_CAST<UnaryMathFunction>(buffer);
}
// Helper functions for CreateMemMoveFunction.
#undef __
#define __ ACCESS_MASM(masm)
// Keep around global pointers to these objects so that Valgrind won't complain.
static size_t* medium_handlers = NULL;
static size_t* small_handlers = NULL;
enum Direction { FORWARD, BACKWARD };
enum Alignment { MOVE_ALIGNED, MOVE_UNALIGNED };
// Expects registers:
// esi - source, aligned if alignment == ALIGNED
// edi - destination, always aligned
// ecx - count (copy size in bytes)
// edx - loop count (number of 64 byte chunks)
void MemMoveEmitMainLoop(MacroAssembler* masm,
Label* move_last_15,
Direction direction,
Alignment alignment) {
Register src = esi;
Register dst = edi;
Register count = ecx;
Register loop_count = edx;
Label loop, move_last_31, move_last_63;
__ cmp(loop_count, 0);
__ j(equal, &move_last_63);
__ bind(&loop);
// Main loop. Copy in 64 byte chunks.
if (direction == BACKWARD) __ sub(src, Immediate(0x40));
__ movdq(alignment == MOVE_ALIGNED, xmm0, Operand(src, 0x00));
__ movdq(alignment == MOVE_ALIGNED, xmm1, Operand(src, 0x10));
__ movdq(alignment == MOVE_ALIGNED, xmm2, Operand(src, 0x20));
__ movdq(alignment == MOVE_ALIGNED, xmm3, Operand(src, 0x30));
if (direction == FORWARD) __ add(src, Immediate(0x40));
if (direction == BACKWARD) __ sub(dst, Immediate(0x40));
__ movdqa(Operand(dst, 0x00), xmm0);
__ movdqa(Operand(dst, 0x10), xmm1);
__ movdqa(Operand(dst, 0x20), xmm2);
__ movdqa(Operand(dst, 0x30), xmm3);
if (direction == FORWARD) __ add(dst, Immediate(0x40));
__ dec(loop_count);
__ j(not_zero, &loop);
// At most 63 bytes left to copy.
__ bind(&move_last_63);
__ test(count, Immediate(0x20));
__ j(zero, &move_last_31);
if (direction == BACKWARD) __ sub(src, Immediate(0x20));
__ movdq(alignment == MOVE_ALIGNED, xmm0, Operand(src, 0x00));
__ movdq(alignment == MOVE_ALIGNED, xmm1, Operand(src, 0x10));
if (direction == FORWARD) __ add(src, Immediate(0x20));
if (direction == BACKWARD) __ sub(dst, Immediate(0x20));
__ movdqa(Operand(dst, 0x00), xmm0);
__ movdqa(Operand(dst, 0x10), xmm1);
if (direction == FORWARD) __ add(dst, Immediate(0x20));
// At most 31 bytes left to copy.
__ bind(&move_last_31);
__ test(count, Immediate(0x10));
__ j(zero, move_last_15);
if (direction == BACKWARD) __ sub(src, Immediate(0x10));
__ movdq(alignment == MOVE_ALIGNED, xmm0, Operand(src, 0));
if (direction == FORWARD) __ add(src, Immediate(0x10));
if (direction == BACKWARD) __ sub(dst, Immediate(0x10));
__ movdqa(Operand(dst, 0), xmm0);
if (direction == FORWARD) __ add(dst, Immediate(0x10));
}
void MemMoveEmitPopAndReturn(MacroAssembler* masm) {
__ pop(esi);
__ pop(edi);
__ ret(0);
}
#undef __
#define __ masm.
OS::MemMoveFunction CreateMemMoveFunction() {
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 NULL;
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;
// When copying up to this many bytes, use special "small" handlers.
const size_t kSmallCopySize = 8;
// When copying up to this many bytes, use special "medium" handlers.
const size_t kMediumCopySize = 63;
// When non-overlapping region of src and dst is less than this,
// use a more careful implementation (slightly slower).
const size_t kMinMoveDistance = 16;
// Note that these values are dictated by the implementation below,
// do not just change them and hope things will work!
int stack_offset = 0; // Update if we change the stack height.
Label backward, backward_much_overlap;
Label forward_much_overlap, small_size, medium_size, pop_and_return;
__ push(edi);
__ push(esi);
stack_offset += 2 * kPointerSize;
Register dst = edi;
Register src = esi;
Register count = ecx;
Register loop_count = edx;
__ mov(dst, Operand(esp, stack_offset + kDestinationOffset));
__ mov(src, Operand(esp, stack_offset + kSourceOffset));
__ mov(count, Operand(esp, stack_offset + kSizeOffset));
__ cmp(dst, src);
__ j(equal, &pop_and_return);
if (CpuFeatures::IsSupported(SSE2)) {
CpuFeatureScope sse2_scope(&masm, SSE2);
__ prefetch(Operand(src, 0), 1);
__ cmp(count, kSmallCopySize);
__ j(below_equal, &small_size);
__ cmp(count, kMediumCopySize);
__ j(below_equal, &medium_size);
__ cmp(dst, src);
__ j(above, &backward);
{
// |dst| is a lower address than |src|. Copy front-to-back.
Label unaligned_source, move_last_15, skip_last_move;
__ mov(eax, src);
__ sub(eax, dst);
__ cmp(eax, kMinMoveDistance);
__ j(below, &forward_much_overlap);
// Copy first 16 bytes.
__ movdqu(xmm0, Operand(src, 0));
__ movdqu(Operand(dst, 0), xmm0);
// Determine distance to alignment: 16 - (dst & 0xF).
__ mov(edx, dst);
__ and_(edx, 0xF);
__ neg(edx);
__ add(edx, Immediate(16));
__ add(dst, edx);
__ add(src, edx);
__ sub(count, edx);
// dst is now aligned. Main copy loop.
__ mov(loop_count, count);
__ shr(loop_count, 6);
// Check if src is also aligned.
__ test(src, Immediate(0xF));
__ j(not_zero, &unaligned_source);
// Copy loop for aligned source and destination.
MemMoveEmitMainLoop(&masm, &move_last_15, FORWARD, MOVE_ALIGNED);
// At most 15 bytes to copy. Copy 16 bytes at end of string.
__ bind(&move_last_15);
__ and_(count, 0xF);
__ j(zero, &skip_last_move, Label::kNear);
__ movdqu(xmm0, Operand(src, count, times_1, -0x10));
__ movdqu(Operand(dst, count, times_1, -0x10), xmm0);
__ bind(&skip_last_move);
MemMoveEmitPopAndReturn(&masm);
// Copy loop for unaligned source and aligned destination.
__ bind(&unaligned_source);
MemMoveEmitMainLoop(&masm, &move_last_15, FORWARD, MOVE_UNALIGNED);
__ jmp(&move_last_15);
// Less than kMinMoveDistance offset between dst and src.
Label loop_until_aligned, last_15_much_overlap;
__ bind(&loop_until_aligned);
__ mov_b(eax, Operand(src, 0));
__ inc(src);
__ mov_b(Operand(dst, 0), eax);
__ inc(dst);
__ dec(count);
__ bind(&forward_much_overlap); // Entry point into this block.
__ test(dst, Immediate(0xF));
__ j(not_zero, &loop_until_aligned);
// dst is now aligned, src can't be. Main copy loop.
__ mov(loop_count, count);
__ shr(loop_count, 6);
MemMoveEmitMainLoop(&masm, &last_15_much_overlap,
FORWARD, MOVE_UNALIGNED);
__ bind(&last_15_much_overlap);
__ and_(count, 0xF);
__ j(zero, &pop_and_return);
__ cmp(count, kSmallCopySize);
__ j(below_equal, &small_size);
__ jmp(&medium_size);
}
{
// |dst| is a higher address than |src|. Copy backwards.
Label unaligned_source, move_first_15, skip_last_move;
__ bind(&backward);
// |dst| and |src| always point to the end of what's left to copy.
__ add(dst, count);
__ add(src, count);
__ mov(eax, dst);
__ sub(eax, src);
__ cmp(eax, kMinMoveDistance);
__ j(below, &backward_much_overlap);
// Copy last 16 bytes.
__ movdqu(xmm0, Operand(src, -0x10));
__ movdqu(Operand(dst, -0x10), xmm0);
// Find distance to alignment: dst & 0xF
__ mov(edx, dst);
__ and_(edx, 0xF);
__ sub(dst, edx);
__ sub(src, edx);
__ sub(count, edx);
// dst is now aligned. Main copy loop.
__ mov(loop_count, count);
__ shr(loop_count, 6);
// Check if src is also aligned.
__ test(src, Immediate(0xF));
__ j(not_zero, &unaligned_source);
// Copy loop for aligned source and destination.
MemMoveEmitMainLoop(&masm, &move_first_15, BACKWARD, MOVE_ALIGNED);
// At most 15 bytes to copy. Copy 16 bytes at beginning of string.
__ bind(&move_first_15);
__ and_(count, 0xF);
__ j(zero, &skip_last_move, Label::kNear);
__ sub(src, count);
__ sub(dst, count);
__ movdqu(xmm0, Operand(src, 0));
__ movdqu(Operand(dst, 0), xmm0);
__ bind(&skip_last_move);
MemMoveEmitPopAndReturn(&masm);
// Copy loop for unaligned source and aligned destination.
__ bind(&unaligned_source);
MemMoveEmitMainLoop(&masm, &move_first_15, BACKWARD, MOVE_UNALIGNED);
__ jmp(&move_first_15);
// Less than kMinMoveDistance offset between dst and src.
Label loop_until_aligned, first_15_much_overlap;
__ bind(&loop_until_aligned);
__ dec(src);
__ dec(dst);
__ mov_b(eax, Operand(src, 0));
__ mov_b(Operand(dst, 0), eax);
__ dec(count);
__ bind(&backward_much_overlap); // Entry point into this block.
__ test(dst, Immediate(0xF));
__ j(not_zero, &loop_until_aligned);
// dst is now aligned, src can't be. Main copy loop.
__ mov(loop_count, count);
__ shr(loop_count, 6);
MemMoveEmitMainLoop(&masm, &first_15_much_overlap,
BACKWARD, MOVE_UNALIGNED);
__ bind(&first_15_much_overlap);
__ and_(count, 0xF);
__ j(zero, &pop_and_return);
// Small/medium handlers expect dst/src to point to the beginning.
__ sub(dst, count);
__ sub(src, count);
__ cmp(count, kSmallCopySize);
__ j(below_equal, &small_size);
__ jmp(&medium_size);
}
{
// Special handlers for 9 <= copy_size < 64. No assumptions about
// alignment or move distance, so all reads must be unaligned and
// must happen before any writes.
Label f9_16, f17_32, f33_48, f49_63;
__ bind(&f9_16);
__ movdbl(xmm0, Operand(src, 0));
__ movdbl(xmm1, Operand(src, count, times_1, -8));
__ movdbl(Operand(dst, 0), xmm0);
__ movdbl(Operand(dst, count, times_1, -8), xmm1);
MemMoveEmitPopAndReturn(&masm);
__ bind(&f17_32);
__ movdqu(xmm0, Operand(src, 0));
__ movdqu(xmm1, Operand(src, count, times_1, -0x10));
__ movdqu(Operand(dst, 0x00), xmm0);
__ movdqu(Operand(dst, count, times_1, -0x10), xmm1);
MemMoveEmitPopAndReturn(&masm);
__ bind(&f33_48);
__ movdqu(xmm0, Operand(src, 0x00));
__ movdqu(xmm1, Operand(src, 0x10));
__ movdqu(xmm2, Operand(src, count, times_1, -0x10));
__ movdqu(Operand(dst, 0x00), xmm0);
__ movdqu(Operand(dst, 0x10), xmm1);
__ movdqu(Operand(dst, count, times_1, -0x10), xmm2);
MemMoveEmitPopAndReturn(&masm);
__ bind(&f49_63);
__ movdqu(xmm0, Operand(src, 0x00));
__ movdqu(xmm1, Operand(src, 0x10));
__ movdqu(xmm2, Operand(src, 0x20));
__ movdqu(xmm3, Operand(src, count, times_1, -0x10));
__ movdqu(Operand(dst, 0x00), xmm0);
__ movdqu(Operand(dst, 0x10), xmm1);
__ movdqu(Operand(dst, 0x20), xmm2);
__ movdqu(Operand(dst, count, times_1, -0x10), xmm3);
MemMoveEmitPopAndReturn(&masm);
medium_handlers = new size_t[4];
medium_handlers[0] = reinterpret_cast<intptr_t>(buffer) + f9_16.pos();
medium_handlers[1] = reinterpret_cast<intptr_t>(buffer) + f17_32.pos();
medium_handlers[2] = reinterpret_cast<intptr_t>(buffer) + f33_48.pos();
medium_handlers[3] = reinterpret_cast<intptr_t>(buffer) + f49_63.pos();
__ bind(&medium_size); // Entry point into this block.
__ mov(eax, count);
__ dec(eax);
__ shr(eax, 4);
if (FLAG_debug_code) {
Label ok;
__ cmp(eax, 3);
__ j(below_equal, &ok);
__ int3();
__ bind(&ok);
}
__ mov(eax, Operand(eax, times_4,
reinterpret_cast<intptr_t>(medium_handlers)));
__ jmp(eax);
}
{
// Specialized copiers for copy_size <= 8 bytes.
Label f0, f1, f2, f3, f4, f5_8;
__ bind(&f0);
MemMoveEmitPopAndReturn(&masm);
__ bind(&f1);
__ mov_b(eax, Operand(src, 0));
__ mov_b(Operand(dst, 0), eax);
MemMoveEmitPopAndReturn(&masm);
__ bind(&f2);
__ mov_w(eax, Operand(src, 0));
__ mov_w(Operand(dst, 0), eax);
MemMoveEmitPopAndReturn(&masm);
__ bind(&f3);
__ mov_w(eax, Operand(src, 0));
__ mov_b(edx, Operand(src, 2));
__ mov_w(Operand(dst, 0), eax);
__ mov_b(Operand(dst, 2), edx);
MemMoveEmitPopAndReturn(&masm);
__ bind(&f4);
__ mov(eax, Operand(src, 0));
__ mov(Operand(dst, 0), eax);
MemMoveEmitPopAndReturn(&masm);
__ bind(&f5_8);
__ mov(eax, Operand(src, 0));
__ mov(edx, Operand(src, count, times_1, -4));
__ mov(Operand(dst, 0), eax);
__ mov(Operand(dst, count, times_1, -4), edx);
MemMoveEmitPopAndReturn(&masm);
small_handlers = new size_t[9];
small_handlers[0] = reinterpret_cast<intptr_t>(buffer) + f0.pos();
small_handlers[1] = reinterpret_cast<intptr_t>(buffer) + f1.pos();
small_handlers[2] = reinterpret_cast<intptr_t>(buffer) + f2.pos();
small_handlers[3] = reinterpret_cast<intptr_t>(buffer) + f3.pos();
small_handlers[4] = reinterpret_cast<intptr_t>(buffer) + f4.pos();
small_handlers[5] = reinterpret_cast<intptr_t>(buffer) + f5_8.pos();
small_handlers[6] = reinterpret_cast<intptr_t>(buffer) + f5_8.pos();
small_handlers[7] = reinterpret_cast<intptr_t>(buffer) + f5_8.pos();
small_handlers[8] = reinterpret_cast<intptr_t>(buffer) + f5_8.pos();
__ bind(&small_size); // Entry point into this block.
if (FLAG_debug_code) {
Label ok;
__ cmp(count, 8);
__ j(below_equal, &ok);
__ int3();
__ bind(&ok);
}
__ mov(eax, Operand(count, times_4,
reinterpret_cast<intptr_t>(small_handlers)));
__ jmp(eax);
}
} else {
// No SSE2.
Label forward;
__ cmp(count, 0);
__ j(equal, &pop_and_return);
__ cmp(dst, src);
__ j(above, &backward);
__ jmp(&forward);
{
// Simple forward copier.
Label forward_loop_1byte, forward_loop_4byte;
__ bind(&forward_loop_4byte);
__ mov(eax, Operand(src, 0));
__ sub(count, Immediate(4));
__ add(src, Immediate(4));
__ mov(Operand(dst, 0), eax);
__ add(dst, Immediate(4));
__ bind(&forward); // Entry point.
__ cmp(count, 3);
__ j(above, &forward_loop_4byte);
__ bind(&forward_loop_1byte);
__ cmp(count, 0);
__ j(below_equal, &pop_and_return);
__ mov_b(eax, Operand(src, 0));
__ dec(count);
__ inc(src);
__ mov_b(Operand(dst, 0), eax);
__ inc(dst);
__ jmp(&forward_loop_1byte);
}
{
// Simple backward copier.
Label backward_loop_1byte, backward_loop_4byte, entry_shortcut;
__ bind(&backward);
__ add(src, count);
__ add(dst, count);
__ cmp(count, 3);
__ j(below_equal, &entry_shortcut);
__ bind(&backward_loop_4byte);
__ sub(src, Immediate(4));
__ sub(count, Immediate(4));
__ mov(eax, Operand(src, 0));
__ sub(dst, Immediate(4));
__ mov(Operand(dst, 0), eax);
__ cmp(count, 3);
__ j(above, &backward_loop_4byte);
__ bind(&backward_loop_1byte);
__ cmp(count, 0);
__ j(below_equal, &pop_and_return);
__ bind(&entry_shortcut);
__ dec(src);
__ dec(count);
__ mov_b(eax, Operand(src, 0));
__ dec(dst);
__ mov_b(Operand(dst, 0), eax);
__ jmp(&backward_loop_1byte);
}
}
__ bind(&pop_and_return);
MemMoveEmitPopAndReturn(&masm);
CodeDesc desc;
masm.GetCode(&desc);
ASSERT(!RelocInfo::RequiresRelocation(desc));
CPU::FlushICache(buffer, actual_size);
OS::ProtectCode(buffer, actual_size);
// TODO(jkummerow): It would be nice to register this code creation event
// with the PROFILE / GDBJIT system.
return FUNCTION_CAST<OS::MemMoveFunction>(buffer);
}
#undef __
// -------------------------------------------------------------------------
// Code generators
#define __ ACCESS_MASM(masm)
void ElementsTransitionGenerator::GenerateMapChangeElementsTransition(
MacroAssembler* masm, AllocationSiteMode mode,
Label* allocation_site_info_found) {
// ----------- S t a t e -------------
// -- eax : value
// -- ebx : target map
// -- ecx : key
// -- edx : receiver
// -- esp[0] : return address
// -----------------------------------
if (mode == TRACK_ALLOCATION_SITE) {
ASSERT(allocation_site_info_found != NULL);
__ TestJSArrayForAllocationSiteInfo(edx, edi);
__ j(equal, allocation_site_info_found);
}
// Set transitioned map.
__ mov(FieldOperand(edx, HeapObject::kMapOffset), ebx);
__ RecordWriteField(edx,
HeapObject::kMapOffset,
ebx,
edi,
kDontSaveFPRegs,
EMIT_REMEMBERED_SET,
OMIT_SMI_CHECK);
}
void ElementsTransitionGenerator::GenerateSmiToDouble(
MacroAssembler* masm, AllocationSiteMode mode, 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;
if (mode == TRACK_ALLOCATION_SITE) {
__ TestJSArrayForAllocationSiteInfo(edx, edi);
__ j(equal, fail);
}
// 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)
AllocationFlags flags =
static_cast<AllocationFlags>(TAG_OBJECT | DOUBLE_ALIGNMENT);
__ Allocate(FixedDoubleArray::kHeaderSize, times_8, edi,
REGISTER_VALUE_IS_SMI, eax, ebx, no_reg, &gc_required, flags);
// 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)) {
CpuFeatureScope use_sse2(masm, 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)) {
CpuFeatureScope fscope(masm, 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)) {
CpuFeatureScope use_sse2(masm, 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, AllocationSiteMode mode, 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;
if (mode == TRACK_ALLOCATION_SITE) {
__ TestJSArrayForAllocationSiteInfo(edx, edi);
__ j(equal, fail);
}
// 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));
__ Allocate(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)) {
CpuFeatureScope fscope(masm, 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 & kOneByteStringTag) != 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,
SeqOneByteString::kHeaderSize));
__ bind(&done);
}
void SeqStringSetCharGenerator::Generate(MacroAssembler* masm,
String::Encoding encoding,
Register string,
Register index,
Register value) {
if (FLAG_debug_code) {
__ test(index, Immediate(kSmiTagMask));
__ Check(zero, "Non-smi index");
__ test(value, Immediate(kSmiTagMask));
__ Check(zero, "Non-smi value");
__ cmp(index, FieldOperand(string, String::kLengthOffset));
__ Check(less, "Index is too large");
__ cmp(index, Immediate(Smi::FromInt(0)));
__ Check(greater_equal, "Index is negative");
__ push(value);
__ mov(value, FieldOperand(string, HeapObject::kMapOffset));
__ movzx_b(value, FieldOperand(value, Map::kInstanceTypeOffset));
__ and_(value, Immediate(kStringRepresentationMask | kStringEncodingMask));
static const uint32_t one_byte_seq_type = kSeqStringTag | kOneByteStringTag;
static const uint32_t two_byte_seq_type = kSeqStringTag | kTwoByteStringTag;
__ cmp(value, Immediate(encoding == String::ONE_BYTE_ENCODING
? one_byte_seq_type : two_byte_seq_type));
__ Check(equal, "Unexpected string type");
__ pop(value);
}
__ SmiUntag(value);
STATIC_ASSERT(kSmiTagSize == 1 && kSmiTag == 0);
if (encoding == String::ONE_BYTE_ENCODING) {
__ SmiUntag(index);
__ mov_b(FieldOperand(string, index, times_1, SeqString::kHeaderSize),
value);
} else {
// No need to untag a smi for two-byte addressing.
__ mov_w(FieldOperand(string, index, times_1, SeqString::kHeaderSize),
value);
}
}
static Operand ExpConstant(int index) {
return Operand::StaticVariable(ExternalReference::math_exp_constants(index));
}
void MathExpGenerator::EmitMathExp(MacroAssembler* masm,
XMMRegister input,
XMMRegister result,
XMMRegister double_scratch,
Register temp1,
Register temp2) {
ASSERT(!input.is(double_scratch));
ASSERT(!input.is(result));
ASSERT(!result.is(double_scratch));
ASSERT(!temp1.is(temp2));
ASSERT(ExternalReference::math_exp_constants(0).address() != NULL);
Label done;
__ movdbl(double_scratch, ExpConstant(0));
__ xorpd(result, result);
__ ucomisd(double_scratch, input);
__ j(above_equal, &done);
__ ucomisd(input, ExpConstant(1));
__ movdbl(result, ExpConstant(2));
__ j(above_equal, &done);
__ movdbl(double_scratch, ExpConstant(3));
__ movdbl(result, ExpConstant(4));
__ mulsd(double_scratch, input);
__ addsd(double_scratch, result);
__ movd(temp2, double_scratch);
__ subsd(double_scratch, result);
__ movdbl(result, ExpConstant(6));
__ mulsd(double_scratch, ExpConstant(5));
__ subsd(double_scratch, input);
__ subsd(result, double_scratch);
__ movsd(input, double_scratch);
__ mulsd(input, double_scratch);
__ mulsd(result, input);
__ mov(temp1, temp2);
__ mulsd(result, ExpConstant(7));
__ subsd(result, double_scratch);
__ add(temp1, Immediate(0x1ff800));
__ addsd(result, ExpConstant(8));
__ and_(temp2, Immediate(0x7ff));
__ shr(temp1, 11);
__ shl(temp1, 20);
__ movd(input, temp1);
__ pshufd(input, input, static_cast<uint8_t>(0xe1)); // Order: 11 10 00 01
__ movdbl(double_scratch, Operand::StaticArray(
temp2, times_8, ExternalReference::math_exp_log_table()));
__ por(input, double_scratch);
__ mulsd(result, input);
__ bind(&done);
}
#undef __
static const int kNoCodeAgeSequenceLength = 5;
static byte* GetNoCodeAgeSequence(uint32_t* length) {
static bool initialized = false;
static byte sequence[kNoCodeAgeSequenceLength];
*length = kNoCodeAgeSequenceLength;
if (!initialized) {
// The sequence of instructions that is patched out for aging code is the
// following boilerplate stack-building prologue that is found both in
// FUNCTION and OPTIMIZED_FUNCTION code:
CodePatcher patcher(sequence, kNoCodeAgeSequenceLength);
patcher.masm()->push(ebp);
patcher.masm()->mov(ebp, esp);
patcher.masm()->push(esi);
patcher.masm()->push(edi);
initialized = true;
}
return sequence;
}
bool Code::IsYoungSequence(byte* sequence) {
uint32_t young_length;
byte* young_sequence = GetNoCodeAgeSequence(&young_length);
bool result = (!memcmp(sequence, young_sequence, young_length));
ASSERT(result || *sequence == kCallOpcode);
return result;
}
void Code::GetCodeAgeAndParity(byte* sequence, Age* age,
MarkingParity* parity) {
if (IsYoungSequence(sequence)) {
*age = kNoAge;
*parity = NO_MARKING_PARITY;
} else {
sequence++; // Skip the kCallOpcode byte
Address target_address = sequence + *reinterpret_cast<int*>(sequence) +
Assembler::kCallTargetAddressOffset;
Code* stub = GetCodeFromTargetAddress(target_address);
GetCodeAgeAndParity(stub, age, parity);
}
}
void Code::PatchPlatformCodeAge(byte* sequence,
Code::Age age,
MarkingParity parity) {
uint32_t young_length;
byte* young_sequence = GetNoCodeAgeSequence(&young_length);
if (age == kNoAge) {
CopyBytes(sequence, young_sequence, young_length);
CPU::FlushICache(sequence, young_length);
} else {
Code* stub = GetCodeAgeStub(age, parity);
CodePatcher patcher(sequence, young_length);
patcher.masm()->call(stub->instruction_start(), RelocInfo::NONE32);
}
}
} } // namespace v8::internal
#endif // V8_TARGET_ARCH_IA32
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