Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 1 | // Copyright 2012 the V8 project authors. All rights reserved. |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 4 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 5 | #include "src/ia32/codegen-ia32.h" |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 6 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 7 | #if V8_TARGET_ARCH_IA32 |
Leon Clarke | f7060e2 | 2010-06-03 12:02:55 +0100 | [diff] [blame] | 8 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 9 | #include "src/codegen.h" |
| 10 | #include "src/heap/heap.h" |
| 11 | #include "src/macro-assembler.h" |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 12 | |
| 13 | namespace v8 { |
| 14 | namespace internal { |
| 15 | |
Ben Murdoch | 7f4d5bd | 2010-06-15 11:15:29 +0100 | [diff] [blame] | 16 | |
| 17 | // ------------------------------------------------------------------------- |
| 18 | // Platform-specific RuntimeCallHelper functions. |
| 19 | |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 20 | void StubRuntimeCallHelper::BeforeCall(MacroAssembler* masm) const { |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 21 | masm->EnterFrame(StackFrame::INTERNAL); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 22 | DCHECK(!masm->has_frame()); |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 23 | masm->set_has_frame(true); |
Ben Murdoch | 7f4d5bd | 2010-06-15 11:15:29 +0100 | [diff] [blame] | 24 | } |
| 25 | |
| 26 | |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 27 | void StubRuntimeCallHelper::AfterCall(MacroAssembler* masm) const { |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 28 | masm->LeaveFrame(StackFrame::INTERNAL); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 29 | DCHECK(masm->has_frame()); |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 30 | masm->set_has_frame(false); |
Ben Murdoch | 7f4d5bd | 2010-06-15 11:15:29 +0100 | [diff] [blame] | 31 | } |
| 32 | |
| 33 | |
Ben Murdoch | 7f4d5bd | 2010-06-15 11:15:29 +0100 | [diff] [blame] | 34 | #define __ masm. |
| 35 | |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 36 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 37 | UnaryMathFunctionWithIsolate CreateSqrtFunction(Isolate* isolate) { |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 38 | size_t actual_size; |
| 39 | // Allocate buffer in executable space. |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 40 | byte* buffer = |
| 41 | static_cast<byte*>(base::OS::Allocate(1 * KB, &actual_size, true)); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 42 | if (buffer == nullptr) return nullptr; |
| 43 | MacroAssembler masm(isolate, buffer, static_cast<int>(actual_size), |
| 44 | CodeObjectRequired::kNo); |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 45 | // esp[1 * kPointerSize]: raw double input |
| 46 | // esp[0 * kPointerSize]: return address |
| 47 | // Move double input into registers. |
| 48 | { |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 49 | __ movsd(xmm0, Operand(esp, 1 * kPointerSize)); |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 50 | __ sqrtsd(xmm0, xmm0); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 51 | __ movsd(Operand(esp, 1 * kPointerSize), xmm0); |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 52 | // Load result into floating point register as return value. |
| 53 | __ fld_d(Operand(esp, 1 * kPointerSize)); |
| 54 | __ Ret(); |
| 55 | } |
| 56 | |
| 57 | CodeDesc desc; |
| 58 | masm.GetCode(&desc); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 59 | DCHECK(!RelocInfo::RequiresRelocation(desc)); |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 60 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 61 | Assembler::FlushICache(isolate, buffer, actual_size); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 62 | base::OS::ProtectCode(buffer, actual_size); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 63 | return FUNCTION_CAST<UnaryMathFunctionWithIsolate>(buffer); |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 64 | } |
| 65 | |
| 66 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 67 | // Helper functions for CreateMemMoveFunction. |
| 68 | #undef __ |
| 69 | #define __ ACCESS_MASM(masm) |
| 70 | |
| 71 | enum Direction { FORWARD, BACKWARD }; |
| 72 | enum Alignment { MOVE_ALIGNED, MOVE_UNALIGNED }; |
| 73 | |
| 74 | // Expects registers: |
| 75 | // esi - source, aligned if alignment == ALIGNED |
| 76 | // edi - destination, always aligned |
| 77 | // ecx - count (copy size in bytes) |
| 78 | // edx - loop count (number of 64 byte chunks) |
| 79 | void MemMoveEmitMainLoop(MacroAssembler* masm, |
| 80 | Label* move_last_15, |
| 81 | Direction direction, |
| 82 | Alignment alignment) { |
| 83 | Register src = esi; |
| 84 | Register dst = edi; |
| 85 | Register count = ecx; |
| 86 | Register loop_count = edx; |
| 87 | Label loop, move_last_31, move_last_63; |
| 88 | __ cmp(loop_count, 0); |
| 89 | __ j(equal, &move_last_63); |
| 90 | __ bind(&loop); |
| 91 | // Main loop. Copy in 64 byte chunks. |
| 92 | if (direction == BACKWARD) __ sub(src, Immediate(0x40)); |
| 93 | __ movdq(alignment == MOVE_ALIGNED, xmm0, Operand(src, 0x00)); |
| 94 | __ movdq(alignment == MOVE_ALIGNED, xmm1, Operand(src, 0x10)); |
| 95 | __ movdq(alignment == MOVE_ALIGNED, xmm2, Operand(src, 0x20)); |
| 96 | __ movdq(alignment == MOVE_ALIGNED, xmm3, Operand(src, 0x30)); |
| 97 | if (direction == FORWARD) __ add(src, Immediate(0x40)); |
| 98 | if (direction == BACKWARD) __ sub(dst, Immediate(0x40)); |
| 99 | __ movdqa(Operand(dst, 0x00), xmm0); |
| 100 | __ movdqa(Operand(dst, 0x10), xmm1); |
| 101 | __ movdqa(Operand(dst, 0x20), xmm2); |
| 102 | __ movdqa(Operand(dst, 0x30), xmm3); |
| 103 | if (direction == FORWARD) __ add(dst, Immediate(0x40)); |
| 104 | __ dec(loop_count); |
| 105 | __ j(not_zero, &loop); |
| 106 | // At most 63 bytes left to copy. |
| 107 | __ bind(&move_last_63); |
| 108 | __ test(count, Immediate(0x20)); |
| 109 | __ j(zero, &move_last_31); |
| 110 | if (direction == BACKWARD) __ sub(src, Immediate(0x20)); |
| 111 | __ movdq(alignment == MOVE_ALIGNED, xmm0, Operand(src, 0x00)); |
| 112 | __ movdq(alignment == MOVE_ALIGNED, xmm1, Operand(src, 0x10)); |
| 113 | if (direction == FORWARD) __ add(src, Immediate(0x20)); |
| 114 | if (direction == BACKWARD) __ sub(dst, Immediate(0x20)); |
| 115 | __ movdqa(Operand(dst, 0x00), xmm0); |
| 116 | __ movdqa(Operand(dst, 0x10), xmm1); |
| 117 | if (direction == FORWARD) __ add(dst, Immediate(0x20)); |
| 118 | // At most 31 bytes left to copy. |
| 119 | __ bind(&move_last_31); |
| 120 | __ test(count, Immediate(0x10)); |
| 121 | __ j(zero, move_last_15); |
| 122 | if (direction == BACKWARD) __ sub(src, Immediate(0x10)); |
| 123 | __ movdq(alignment == MOVE_ALIGNED, xmm0, Operand(src, 0)); |
| 124 | if (direction == FORWARD) __ add(src, Immediate(0x10)); |
| 125 | if (direction == BACKWARD) __ sub(dst, Immediate(0x10)); |
| 126 | __ movdqa(Operand(dst, 0), xmm0); |
| 127 | if (direction == FORWARD) __ add(dst, Immediate(0x10)); |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 128 | } |
| 129 | |
| 130 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 131 | void MemMoveEmitPopAndReturn(MacroAssembler* masm) { |
| 132 | __ pop(esi); |
| 133 | __ pop(edi); |
| 134 | __ ret(0); |
| 135 | } |
| 136 | |
| 137 | |
| 138 | #undef __ |
| 139 | #define __ masm. |
| 140 | |
| 141 | |
| 142 | class LabelConverter { |
| 143 | public: |
| 144 | explicit LabelConverter(byte* buffer) : buffer_(buffer) {} |
| 145 | int32_t address(Label* l) const { |
| 146 | return reinterpret_cast<int32_t>(buffer_) + l->pos(); |
| 147 | } |
| 148 | private: |
| 149 | byte* buffer_; |
| 150 | }; |
| 151 | |
| 152 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 153 | MemMoveFunction CreateMemMoveFunction(Isolate* isolate) { |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 154 | size_t actual_size; |
| 155 | // Allocate buffer in executable space. |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 156 | byte* buffer = |
| 157 | static_cast<byte*>(base::OS::Allocate(1 * KB, &actual_size, true)); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 158 | if (buffer == nullptr) return nullptr; |
| 159 | MacroAssembler masm(isolate, buffer, static_cast<int>(actual_size), |
| 160 | CodeObjectRequired::kNo); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 161 | LabelConverter conv(buffer); |
Ben Murdoch | 7f4d5bd | 2010-06-15 11:15:29 +0100 | [diff] [blame] | 162 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 163 | // Generated code is put into a fixed, unmovable buffer, and not into |
Ben Murdoch | 7f4d5bd | 2010-06-15 11:15:29 +0100 | [diff] [blame] | 164 | // the V8 heap. We can't, and don't, refer to any relocatable addresses |
| 165 | // (e.g. the JavaScript nan-object). |
| 166 | |
| 167 | // 32-bit C declaration function calls pass arguments on stack. |
| 168 | |
| 169 | // Stack layout: |
| 170 | // esp[12]: Third argument, size. |
| 171 | // esp[8]: Second argument, source pointer. |
| 172 | // esp[4]: First argument, destination pointer. |
| 173 | // esp[0]: return address |
| 174 | |
| 175 | const int kDestinationOffset = 1 * kPointerSize; |
| 176 | const int kSourceOffset = 2 * kPointerSize; |
| 177 | const int kSizeOffset = 3 * kPointerSize; |
| 178 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 179 | // When copying up to this many bytes, use special "small" handlers. |
| 180 | const size_t kSmallCopySize = 8; |
| 181 | // When copying up to this many bytes, use special "medium" handlers. |
| 182 | const size_t kMediumCopySize = 63; |
| 183 | // When non-overlapping region of src and dst is less than this, |
| 184 | // use a more careful implementation (slightly slower). |
| 185 | const size_t kMinMoveDistance = 16; |
| 186 | // Note that these values are dictated by the implementation below, |
| 187 | // do not just change them and hope things will work! |
| 188 | |
Ben Murdoch | 7f4d5bd | 2010-06-15 11:15:29 +0100 | [diff] [blame] | 189 | int stack_offset = 0; // Update if we change the stack height. |
| 190 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 191 | Label backward, backward_much_overlap; |
| 192 | Label forward_much_overlap, small_size, medium_size, pop_and_return; |
| 193 | __ push(edi); |
| 194 | __ push(esi); |
| 195 | stack_offset += 2 * kPointerSize; |
| 196 | Register dst = edi; |
| 197 | Register src = esi; |
| 198 | Register count = ecx; |
| 199 | Register loop_count = edx; |
| 200 | __ mov(dst, Operand(esp, stack_offset + kDestinationOffset)); |
| 201 | __ mov(src, Operand(esp, stack_offset + kSourceOffset)); |
| 202 | __ mov(count, Operand(esp, stack_offset + kSizeOffset)); |
Ben Murdoch | 7f4d5bd | 2010-06-15 11:15:29 +0100 | [diff] [blame] | 203 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 204 | __ cmp(dst, src); |
| 205 | __ j(equal, &pop_and_return); |
Ben Murdoch | 7f4d5bd | 2010-06-15 11:15:29 +0100 | [diff] [blame] | 206 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 207 | __ prefetch(Operand(src, 0), 1); |
| 208 | __ cmp(count, kSmallCopySize); |
| 209 | __ j(below_equal, &small_size); |
| 210 | __ cmp(count, kMediumCopySize); |
| 211 | __ j(below_equal, &medium_size); |
| 212 | __ cmp(dst, src); |
| 213 | __ j(above, &backward); |
| 214 | |
| 215 | { |
| 216 | // |dst| is a lower address than |src|. Copy front-to-back. |
| 217 | Label unaligned_source, move_last_15, skip_last_move; |
| 218 | __ mov(eax, src); |
| 219 | __ sub(eax, dst); |
| 220 | __ cmp(eax, kMinMoveDistance); |
| 221 | __ j(below, &forward_much_overlap); |
| 222 | // Copy first 16 bytes. |
Ben Murdoch | 7f4d5bd | 2010-06-15 11:15:29 +0100 | [diff] [blame] | 223 | __ movdqu(xmm0, Operand(src, 0)); |
| 224 | __ movdqu(Operand(dst, 0), xmm0); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 225 | // Determine distance to alignment: 16 - (dst & 0xF). |
Ben Murdoch | 7f4d5bd | 2010-06-15 11:15:29 +0100 | [diff] [blame] | 226 | __ mov(edx, dst); |
| 227 | __ and_(edx, 0xF); |
| 228 | __ neg(edx); |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 229 | __ add(edx, Immediate(16)); |
| 230 | __ add(dst, edx); |
| 231 | __ add(src, edx); |
| 232 | __ sub(count, edx); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 233 | // dst is now aligned. Main copy loop. |
| 234 | __ mov(loop_count, count); |
| 235 | __ shr(loop_count, 6); |
| 236 | // Check if src is also aligned. |
| 237 | __ test(src, Immediate(0xF)); |
Ben Murdoch | 7f4d5bd | 2010-06-15 11:15:29 +0100 | [diff] [blame] | 238 | __ j(not_zero, &unaligned_source); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 239 | // Copy loop for aligned source and destination. |
| 240 | MemMoveEmitMainLoop(&masm, &move_last_15, FORWARD, MOVE_ALIGNED); |
| 241 | // At most 15 bytes to copy. Copy 16 bytes at end of string. |
| 242 | __ bind(&move_last_15); |
| 243 | __ and_(count, 0xF); |
| 244 | __ j(zero, &skip_last_move, Label::kNear); |
| 245 | __ movdqu(xmm0, Operand(src, count, times_1, -0x10)); |
| 246 | __ movdqu(Operand(dst, count, times_1, -0x10), xmm0); |
| 247 | __ bind(&skip_last_move); |
| 248 | MemMoveEmitPopAndReturn(&masm); |
Ben Murdoch | 7f4d5bd | 2010-06-15 11:15:29 +0100 | [diff] [blame] | 249 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 250 | // Copy loop for unaligned source and aligned destination. |
| 251 | __ bind(&unaligned_source); |
| 252 | MemMoveEmitMainLoop(&masm, &move_last_15, FORWARD, MOVE_UNALIGNED); |
| 253 | __ jmp(&move_last_15); |
Ben Murdoch | 7f4d5bd | 2010-06-15 11:15:29 +0100 | [diff] [blame] | 254 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 255 | // Less than kMinMoveDistance offset between dst and src. |
| 256 | Label loop_until_aligned, last_15_much_overlap; |
| 257 | __ bind(&loop_until_aligned); |
| 258 | __ mov_b(eax, Operand(src, 0)); |
| 259 | __ inc(src); |
| 260 | __ mov_b(Operand(dst, 0), eax); |
| 261 | __ inc(dst); |
| 262 | __ dec(count); |
| 263 | __ bind(&forward_much_overlap); // Entry point into this block. |
| 264 | __ test(dst, Immediate(0xF)); |
| 265 | __ j(not_zero, &loop_until_aligned); |
| 266 | // dst is now aligned, src can't be. Main copy loop. |
| 267 | __ mov(loop_count, count); |
| 268 | __ shr(loop_count, 6); |
| 269 | MemMoveEmitMainLoop(&masm, &last_15_much_overlap, |
| 270 | FORWARD, MOVE_UNALIGNED); |
| 271 | __ bind(&last_15_much_overlap); |
| 272 | __ and_(count, 0xF); |
| 273 | __ j(zero, &pop_and_return); |
| 274 | __ cmp(count, kSmallCopySize); |
| 275 | __ j(below_equal, &small_size); |
| 276 | __ jmp(&medium_size); |
| 277 | } |
Ben Murdoch | 7f4d5bd | 2010-06-15 11:15:29 +0100 | [diff] [blame] | 278 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 279 | { |
| 280 | // |dst| is a higher address than |src|. Copy backwards. |
| 281 | Label unaligned_source, move_first_15, skip_last_move; |
| 282 | __ bind(&backward); |
| 283 | // |dst| and |src| always point to the end of what's left to copy. |
| 284 | __ add(dst, count); |
| 285 | __ add(src, count); |
| 286 | __ mov(eax, dst); |
| 287 | __ sub(eax, src); |
| 288 | __ cmp(eax, kMinMoveDistance); |
| 289 | __ j(below, &backward_much_overlap); |
| 290 | // Copy last 16 bytes. |
| 291 | __ movdqu(xmm0, Operand(src, -0x10)); |
| 292 | __ movdqu(Operand(dst, -0x10), xmm0); |
| 293 | // Find distance to alignment: dst & 0xF |
| 294 | __ mov(edx, dst); |
| 295 | __ and_(edx, 0xF); |
| 296 | __ sub(dst, edx); |
| 297 | __ sub(src, edx); |
| 298 | __ sub(count, edx); |
| 299 | // dst is now aligned. Main copy loop. |
| 300 | __ mov(loop_count, count); |
| 301 | __ shr(loop_count, 6); |
| 302 | // Check if src is also aligned. |
| 303 | __ test(src, Immediate(0xF)); |
| 304 | __ j(not_zero, &unaligned_source); |
| 305 | // Copy loop for aligned source and destination. |
| 306 | MemMoveEmitMainLoop(&masm, &move_first_15, BACKWARD, MOVE_ALIGNED); |
| 307 | // At most 15 bytes to copy. Copy 16 bytes at beginning of string. |
| 308 | __ bind(&move_first_15); |
| 309 | __ and_(count, 0xF); |
| 310 | __ j(zero, &skip_last_move, Label::kNear); |
| 311 | __ sub(src, count); |
| 312 | __ sub(dst, count); |
| 313 | __ movdqu(xmm0, Operand(src, 0)); |
| 314 | __ movdqu(Operand(dst, 0), xmm0); |
| 315 | __ bind(&skip_last_move); |
| 316 | MemMoveEmitPopAndReturn(&masm); |
Ben Murdoch | 7f4d5bd | 2010-06-15 11:15:29 +0100 | [diff] [blame] | 317 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 318 | // Copy loop for unaligned source and aligned destination. |
| 319 | __ bind(&unaligned_source); |
| 320 | MemMoveEmitMainLoop(&masm, &move_first_15, BACKWARD, MOVE_UNALIGNED); |
| 321 | __ jmp(&move_first_15); |
Ben Murdoch | 7f4d5bd | 2010-06-15 11:15:29 +0100 | [diff] [blame] | 322 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 323 | // Less than kMinMoveDistance offset between dst and src. |
| 324 | Label loop_until_aligned, first_15_much_overlap; |
| 325 | __ bind(&loop_until_aligned); |
| 326 | __ dec(src); |
| 327 | __ dec(dst); |
| 328 | __ mov_b(eax, Operand(src, 0)); |
| 329 | __ mov_b(Operand(dst, 0), eax); |
| 330 | __ dec(count); |
| 331 | __ bind(&backward_much_overlap); // Entry point into this block. |
| 332 | __ test(dst, Immediate(0xF)); |
| 333 | __ j(not_zero, &loop_until_aligned); |
| 334 | // dst is now aligned, src can't be. Main copy loop. |
| 335 | __ mov(loop_count, count); |
| 336 | __ shr(loop_count, 6); |
| 337 | MemMoveEmitMainLoop(&masm, &first_15_much_overlap, |
| 338 | BACKWARD, MOVE_UNALIGNED); |
| 339 | __ bind(&first_15_much_overlap); |
| 340 | __ and_(count, 0xF); |
| 341 | __ j(zero, &pop_and_return); |
| 342 | // Small/medium handlers expect dst/src to point to the beginning. |
| 343 | __ sub(dst, count); |
| 344 | __ sub(src, count); |
| 345 | __ cmp(count, kSmallCopySize); |
| 346 | __ j(below_equal, &small_size); |
| 347 | __ jmp(&medium_size); |
| 348 | } |
| 349 | { |
| 350 | // Special handlers for 9 <= copy_size < 64. No assumptions about |
| 351 | // alignment or move distance, so all reads must be unaligned and |
| 352 | // must happen before any writes. |
| 353 | Label medium_handlers, f9_16, f17_32, f33_48, f49_63; |
| 354 | |
| 355 | __ bind(&f9_16); |
| 356 | __ movsd(xmm0, Operand(src, 0)); |
| 357 | __ movsd(xmm1, Operand(src, count, times_1, -8)); |
| 358 | __ movsd(Operand(dst, 0), xmm0); |
| 359 | __ movsd(Operand(dst, count, times_1, -8), xmm1); |
| 360 | MemMoveEmitPopAndReturn(&masm); |
| 361 | |
| 362 | __ bind(&f17_32); |
| 363 | __ movdqu(xmm0, Operand(src, 0)); |
| 364 | __ movdqu(xmm1, Operand(src, count, times_1, -0x10)); |
| 365 | __ movdqu(Operand(dst, 0x00), xmm0); |
| 366 | __ movdqu(Operand(dst, count, times_1, -0x10), xmm1); |
| 367 | MemMoveEmitPopAndReturn(&masm); |
| 368 | |
| 369 | __ bind(&f33_48); |
| 370 | __ movdqu(xmm0, Operand(src, 0x00)); |
| 371 | __ movdqu(xmm1, Operand(src, 0x10)); |
| 372 | __ movdqu(xmm2, Operand(src, count, times_1, -0x10)); |
| 373 | __ movdqu(Operand(dst, 0x00), xmm0); |
| 374 | __ movdqu(Operand(dst, 0x10), xmm1); |
| 375 | __ movdqu(Operand(dst, count, times_1, -0x10), xmm2); |
| 376 | MemMoveEmitPopAndReturn(&masm); |
| 377 | |
| 378 | __ bind(&f49_63); |
| 379 | __ movdqu(xmm0, Operand(src, 0x00)); |
| 380 | __ movdqu(xmm1, Operand(src, 0x10)); |
| 381 | __ movdqu(xmm2, Operand(src, 0x20)); |
| 382 | __ movdqu(xmm3, Operand(src, count, times_1, -0x10)); |
| 383 | __ movdqu(Operand(dst, 0x00), xmm0); |
| 384 | __ movdqu(Operand(dst, 0x10), xmm1); |
| 385 | __ movdqu(Operand(dst, 0x20), xmm2); |
| 386 | __ movdqu(Operand(dst, count, times_1, -0x10), xmm3); |
| 387 | MemMoveEmitPopAndReturn(&masm); |
| 388 | |
| 389 | __ bind(&medium_handlers); |
| 390 | __ dd(conv.address(&f9_16)); |
| 391 | __ dd(conv.address(&f17_32)); |
| 392 | __ dd(conv.address(&f33_48)); |
| 393 | __ dd(conv.address(&f49_63)); |
| 394 | |
| 395 | __ bind(&medium_size); // Entry point into this block. |
| 396 | __ mov(eax, count); |
| 397 | __ dec(eax); |
| 398 | __ shr(eax, 4); |
| 399 | if (FLAG_debug_code) { |
| 400 | Label ok; |
| 401 | __ cmp(eax, 3); |
| 402 | __ j(below_equal, &ok); |
| 403 | __ int3(); |
| 404 | __ bind(&ok); |
Ben Murdoch | 7f4d5bd | 2010-06-15 11:15:29 +0100 | [diff] [blame] | 405 | } |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 406 | __ mov(eax, Operand(eax, times_4, conv.address(&medium_handlers))); |
| 407 | __ jmp(eax); |
| 408 | } |
| 409 | { |
| 410 | // Specialized copiers for copy_size <= 8 bytes. |
| 411 | Label small_handlers, f0, f1, f2, f3, f4, f5_8; |
| 412 | __ bind(&f0); |
| 413 | MemMoveEmitPopAndReturn(&masm); |
Ben Murdoch | 7f4d5bd | 2010-06-15 11:15:29 +0100 | [diff] [blame] | 414 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 415 | __ bind(&f1); |
| 416 | __ mov_b(eax, Operand(src, 0)); |
| 417 | __ mov_b(Operand(dst, 0), eax); |
| 418 | MemMoveEmitPopAndReturn(&masm); |
Ben Murdoch | 7f4d5bd | 2010-06-15 11:15:29 +0100 | [diff] [blame] | 419 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 420 | __ bind(&f2); |
| 421 | __ mov_w(eax, Operand(src, 0)); |
| 422 | __ mov_w(Operand(dst, 0), eax); |
| 423 | MemMoveEmitPopAndReturn(&masm); |
Ben Murdoch | 7f4d5bd | 2010-06-15 11:15:29 +0100 | [diff] [blame] | 424 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 425 | __ bind(&f3); |
| 426 | __ mov_w(eax, Operand(src, 0)); |
| 427 | __ mov_b(edx, Operand(src, 2)); |
| 428 | __ mov_w(Operand(dst, 0), eax); |
| 429 | __ mov_b(Operand(dst, 2), edx); |
| 430 | MemMoveEmitPopAndReturn(&masm); |
Ben Murdoch | 7f4d5bd | 2010-06-15 11:15:29 +0100 | [diff] [blame] | 431 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 432 | __ bind(&f4); |
Ben Murdoch | 7f4d5bd | 2010-06-15 11:15:29 +0100 | [diff] [blame] | 433 | __ mov(eax, Operand(src, 0)); |
| 434 | __ mov(Operand(dst, 0), eax); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 435 | MemMoveEmitPopAndReturn(&masm); |
Ben Murdoch | 7f4d5bd | 2010-06-15 11:15:29 +0100 | [diff] [blame] | 436 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 437 | __ bind(&f5_8); |
| 438 | __ mov(eax, Operand(src, 0)); |
| 439 | __ mov(edx, Operand(src, count, times_1, -4)); |
| 440 | __ mov(Operand(dst, 0), eax); |
| 441 | __ mov(Operand(dst, count, times_1, -4), edx); |
| 442 | MemMoveEmitPopAndReturn(&masm); |
Ben Murdoch | 7f4d5bd | 2010-06-15 11:15:29 +0100 | [diff] [blame] | 443 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 444 | __ bind(&small_handlers); |
| 445 | __ dd(conv.address(&f0)); |
| 446 | __ dd(conv.address(&f1)); |
| 447 | __ dd(conv.address(&f2)); |
| 448 | __ dd(conv.address(&f3)); |
| 449 | __ dd(conv.address(&f4)); |
| 450 | __ dd(conv.address(&f5_8)); |
| 451 | __ dd(conv.address(&f5_8)); |
| 452 | __ dd(conv.address(&f5_8)); |
| 453 | __ dd(conv.address(&f5_8)); |
Ben Murdoch | 7f4d5bd | 2010-06-15 11:15:29 +0100 | [diff] [blame] | 454 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 455 | __ bind(&small_size); // Entry point into this block. |
| 456 | if (FLAG_debug_code) { |
| 457 | Label ok; |
| 458 | __ cmp(count, 8); |
| 459 | __ j(below_equal, &ok); |
| 460 | __ int3(); |
| 461 | __ bind(&ok); |
| 462 | } |
| 463 | __ mov(eax, Operand(count, times_4, conv.address(&small_handlers))); |
| 464 | __ jmp(eax); |
Ben Murdoch | 7f4d5bd | 2010-06-15 11:15:29 +0100 | [diff] [blame] | 465 | } |
| 466 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 467 | __ bind(&pop_and_return); |
| 468 | MemMoveEmitPopAndReturn(&masm); |
| 469 | |
Ben Murdoch | 7f4d5bd | 2010-06-15 11:15:29 +0100 | [diff] [blame] | 470 | CodeDesc desc; |
| 471 | masm.GetCode(&desc); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 472 | DCHECK(!RelocInfo::RequiresRelocation(desc)); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 473 | Assembler::FlushICache(isolate, buffer, actual_size); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 474 | base::OS::ProtectCode(buffer, actual_size); |
| 475 | // TODO(jkummerow): It would be nice to register this code creation event |
| 476 | // with the PROFILE / GDBJIT system. |
| 477 | return FUNCTION_CAST<MemMoveFunction>(buffer); |
Ben Murdoch | 7f4d5bd | 2010-06-15 11:15:29 +0100 | [diff] [blame] | 478 | } |
| 479 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 480 | |
Ben Murdoch | 7f4d5bd | 2010-06-15 11:15:29 +0100 | [diff] [blame] | 481 | #undef __ |
| 482 | |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 483 | // ------------------------------------------------------------------------- |
| 484 | // Code generators |
| 485 | |
| 486 | #define __ ACCESS_MASM(masm) |
| 487 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 488 | |
| 489 | void ElementsTransitionGenerator::GenerateMapChangeElementsTransition( |
| 490 | MacroAssembler* masm, |
| 491 | Register receiver, |
| 492 | Register key, |
| 493 | Register value, |
| 494 | Register target_map, |
| 495 | AllocationSiteMode mode, |
| 496 | Label* allocation_memento_found) { |
| 497 | Register scratch = edi; |
| 498 | DCHECK(!AreAliased(receiver, key, value, target_map, scratch)); |
| 499 | |
| 500 | if (mode == TRACK_ALLOCATION_SITE) { |
| 501 | DCHECK(allocation_memento_found != NULL); |
| 502 | __ JumpIfJSArrayHasAllocationMemento( |
| 503 | receiver, scratch, allocation_memento_found); |
| 504 | } |
| 505 | |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 506 | // Set transitioned map. |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 507 | __ mov(FieldOperand(receiver, HeapObject::kMapOffset), target_map); |
| 508 | __ RecordWriteField(receiver, |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 509 | HeapObject::kMapOffset, |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 510 | target_map, |
| 511 | scratch, |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 512 | kDontSaveFPRegs, |
| 513 | EMIT_REMEMBERED_SET, |
| 514 | OMIT_SMI_CHECK); |
| 515 | } |
| 516 | |
| 517 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 518 | void ElementsTransitionGenerator::GenerateSmiToDouble( |
| 519 | MacroAssembler* masm, |
| 520 | Register receiver, |
| 521 | Register key, |
| 522 | Register value, |
| 523 | Register target_map, |
| 524 | AllocationSiteMode mode, |
| 525 | Label* fail) { |
| 526 | // Return address is on the stack. |
| 527 | DCHECK(receiver.is(edx)); |
| 528 | DCHECK(key.is(ecx)); |
| 529 | DCHECK(value.is(eax)); |
| 530 | DCHECK(target_map.is(ebx)); |
| 531 | |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 532 | Label loop, entry, convert_hole, gc_required, only_change_map; |
| 533 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 534 | if (mode == TRACK_ALLOCATION_SITE) { |
| 535 | __ JumpIfJSArrayHasAllocationMemento(edx, edi, fail); |
| 536 | } |
| 537 | |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 538 | // Check for empty arrays, which only require a map transition and no changes |
| 539 | // to the backing store. |
| 540 | __ mov(edi, FieldOperand(edx, JSObject::kElementsOffset)); |
| 541 | __ cmp(edi, Immediate(masm->isolate()->factory()->empty_fixed_array())); |
| 542 | __ j(equal, &only_change_map); |
| 543 | |
| 544 | __ push(eax); |
| 545 | __ push(ebx); |
Ben Murdoch | 61f157c | 2016-09-16 13:49:30 +0100 | [diff] [blame] | 546 | __ push(esi); |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 547 | |
| 548 | __ mov(edi, FieldOperand(edi, FixedArray::kLengthOffset)); |
| 549 | |
| 550 | // Allocate new FixedDoubleArray. |
| 551 | // edx: receiver |
| 552 | // edi: length of source FixedArray (smi-tagged) |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame] | 553 | AllocationFlags flags = static_cast<AllocationFlags>(DOUBLE_ALIGNMENT); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 554 | __ Allocate(FixedDoubleArray::kHeaderSize, times_8, edi, |
| 555 | REGISTER_VALUE_IS_SMI, eax, ebx, no_reg, &gc_required, flags); |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 556 | |
| 557 | // eax: destination FixedDoubleArray |
| 558 | // edi: number of elements |
| 559 | // edx: receiver |
| 560 | __ mov(FieldOperand(eax, HeapObject::kMapOffset), |
| 561 | Immediate(masm->isolate()->factory()->fixed_double_array_map())); |
| 562 | __ mov(FieldOperand(eax, FixedDoubleArray::kLengthOffset), edi); |
| 563 | __ mov(esi, FieldOperand(edx, JSObject::kElementsOffset)); |
| 564 | // Replace receiver's backing store with newly created FixedDoubleArray. |
| 565 | __ mov(FieldOperand(edx, JSObject::kElementsOffset), eax); |
| 566 | __ mov(ebx, eax); |
| 567 | __ RecordWriteField(edx, |
| 568 | JSObject::kElementsOffset, |
| 569 | ebx, |
| 570 | edi, |
| 571 | kDontSaveFPRegs, |
| 572 | EMIT_REMEMBERED_SET, |
| 573 | OMIT_SMI_CHECK); |
| 574 | |
| 575 | __ mov(edi, FieldOperand(esi, FixedArray::kLengthOffset)); |
| 576 | |
| 577 | // Prepare for conversion loop. |
| 578 | ExternalReference canonical_the_hole_nan_reference = |
| 579 | ExternalReference::address_of_the_hole_nan(); |
| 580 | XMMRegister the_hole_nan = xmm1; |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 581 | __ movsd(the_hole_nan, |
| 582 | Operand::StaticVariable(canonical_the_hole_nan_reference)); |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 583 | __ jmp(&entry); |
| 584 | |
| 585 | // Call into runtime if GC is required. |
| 586 | __ bind(&gc_required); |
Ben Murdoch | 61f157c | 2016-09-16 13:49:30 +0100 | [diff] [blame] | 587 | |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 588 | // Restore registers before jumping into runtime. |
Ben Murdoch | 61f157c | 2016-09-16 13:49:30 +0100 | [diff] [blame] | 589 | __ pop(esi); |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 590 | __ pop(ebx); |
| 591 | __ pop(eax); |
| 592 | __ jmp(fail); |
| 593 | |
| 594 | // Convert and copy elements |
| 595 | // esi: source FixedArray |
| 596 | __ bind(&loop); |
| 597 | __ mov(ebx, FieldOperand(esi, edi, times_2, FixedArray::kHeaderSize)); |
| 598 | // ebx: current element from source |
| 599 | // edi: index of current element |
| 600 | __ JumpIfNotSmi(ebx, &convert_hole); |
| 601 | |
| 602 | // Normal smi, convert it to double and store. |
| 603 | __ SmiUntag(ebx); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 604 | __ Cvtsi2sd(xmm0, ebx); |
| 605 | __ movsd(FieldOperand(eax, edi, times_4, FixedDoubleArray::kHeaderSize), |
| 606 | xmm0); |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 607 | __ jmp(&entry); |
| 608 | |
| 609 | // Found hole, store hole_nan_as_double instead. |
| 610 | __ bind(&convert_hole); |
| 611 | |
| 612 | if (FLAG_debug_code) { |
| 613 | __ cmp(ebx, masm->isolate()->factory()->the_hole_value()); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 614 | __ Assert(equal, kObjectFoundInSmiOnlyArray); |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 615 | } |
| 616 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 617 | __ movsd(FieldOperand(eax, edi, times_4, FixedDoubleArray::kHeaderSize), |
| 618 | the_hole_nan); |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 619 | |
| 620 | __ bind(&entry); |
| 621 | __ sub(edi, Immediate(Smi::FromInt(1))); |
| 622 | __ j(not_sign, &loop); |
| 623 | |
Ben Murdoch | 61f157c | 2016-09-16 13:49:30 +0100 | [diff] [blame] | 624 | // Restore registers. |
| 625 | __ pop(esi); |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 626 | __ pop(ebx); |
| 627 | __ pop(eax); |
| 628 | |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 629 | __ bind(&only_change_map); |
| 630 | // eax: value |
| 631 | // ebx: target map |
| 632 | // Set transitioned map. |
| 633 | __ mov(FieldOperand(edx, HeapObject::kMapOffset), ebx); |
| 634 | __ RecordWriteField(edx, |
| 635 | HeapObject::kMapOffset, |
| 636 | ebx, |
| 637 | edi, |
| 638 | kDontSaveFPRegs, |
| 639 | OMIT_REMEMBERED_SET, |
| 640 | OMIT_SMI_CHECK); |
| 641 | } |
| 642 | |
| 643 | |
| 644 | void ElementsTransitionGenerator::GenerateDoubleToObject( |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 645 | MacroAssembler* masm, |
| 646 | Register receiver, |
| 647 | Register key, |
| 648 | Register value, |
| 649 | Register target_map, |
| 650 | AllocationSiteMode mode, |
| 651 | Label* fail) { |
| 652 | // Return address is on the stack. |
| 653 | DCHECK(receiver.is(edx)); |
| 654 | DCHECK(key.is(ecx)); |
| 655 | DCHECK(value.is(eax)); |
| 656 | DCHECK(target_map.is(ebx)); |
| 657 | |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 658 | Label loop, entry, convert_hole, gc_required, only_change_map, success; |
| 659 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 660 | if (mode == TRACK_ALLOCATION_SITE) { |
| 661 | __ JumpIfJSArrayHasAllocationMemento(edx, edi, fail); |
| 662 | } |
| 663 | |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 664 | // Check for empty arrays, which only require a map transition and no changes |
| 665 | // to the backing store. |
| 666 | __ mov(edi, FieldOperand(edx, JSObject::kElementsOffset)); |
| 667 | __ cmp(edi, Immediate(masm->isolate()->factory()->empty_fixed_array())); |
| 668 | __ j(equal, &only_change_map); |
| 669 | |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 670 | __ push(esi); |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 671 | __ push(eax); |
| 672 | __ push(edx); |
| 673 | __ push(ebx); |
| 674 | |
| 675 | __ mov(ebx, FieldOperand(edi, FixedDoubleArray::kLengthOffset)); |
| 676 | |
| 677 | // Allocate new FixedArray. |
| 678 | // ebx: length of source FixedDoubleArray (smi-tagged) |
| 679 | __ lea(edi, Operand(ebx, times_2, FixedArray::kHeaderSize)); |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame] | 680 | __ Allocate(edi, eax, esi, no_reg, &gc_required, NO_ALLOCATION_FLAGS); |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 681 | |
| 682 | // eax: destination FixedArray |
| 683 | // ebx: number of elements |
| 684 | __ mov(FieldOperand(eax, HeapObject::kMapOffset), |
| 685 | Immediate(masm->isolate()->factory()->fixed_array_map())); |
| 686 | __ mov(FieldOperand(eax, FixedArray::kLengthOffset), ebx); |
| 687 | __ mov(edi, FieldOperand(edx, JSObject::kElementsOffset)); |
| 688 | |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 689 | // Allocating heap numbers in the loop below can fail and cause a jump to |
| 690 | // gc_required. We can't leave a partly initialized FixedArray behind, |
| 691 | // so pessimistically fill it with holes now. |
| 692 | Label initialization_loop, initialization_loop_entry; |
| 693 | __ jmp(&initialization_loop_entry, Label::kNear); |
| 694 | __ bind(&initialization_loop); |
| 695 | __ mov(FieldOperand(eax, ebx, times_2, FixedArray::kHeaderSize), |
| 696 | masm->isolate()->factory()->the_hole_value()); |
| 697 | __ bind(&initialization_loop_entry); |
| 698 | __ sub(ebx, Immediate(Smi::FromInt(1))); |
| 699 | __ j(not_sign, &initialization_loop); |
| 700 | |
| 701 | __ mov(ebx, FieldOperand(edi, FixedDoubleArray::kLengthOffset)); |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 702 | __ jmp(&entry); |
| 703 | |
| 704 | // ebx: target map |
| 705 | // edx: receiver |
| 706 | // Set transitioned map. |
| 707 | __ bind(&only_change_map); |
| 708 | __ mov(FieldOperand(edx, HeapObject::kMapOffset), ebx); |
| 709 | __ RecordWriteField(edx, |
| 710 | HeapObject::kMapOffset, |
| 711 | ebx, |
| 712 | edi, |
| 713 | kDontSaveFPRegs, |
| 714 | OMIT_REMEMBERED_SET, |
| 715 | OMIT_SMI_CHECK); |
| 716 | __ jmp(&success); |
| 717 | |
| 718 | // Call into runtime if GC is required. |
| 719 | __ bind(&gc_required); |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 720 | __ pop(ebx); |
| 721 | __ pop(edx); |
| 722 | __ pop(eax); |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 723 | __ pop(esi); |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 724 | __ jmp(fail); |
| 725 | |
| 726 | // Box doubles into heap numbers. |
| 727 | // edi: source FixedDoubleArray |
| 728 | // eax: destination FixedArray |
| 729 | __ bind(&loop); |
| 730 | // ebx: index of current element (smi-tagged) |
| 731 | uint32_t offset = FixedDoubleArray::kHeaderSize + sizeof(kHoleNanLower32); |
| 732 | __ cmp(FieldOperand(edi, ebx, times_4, offset), Immediate(kHoleNanUpper32)); |
| 733 | __ j(equal, &convert_hole); |
| 734 | |
| 735 | // Non-hole double, copy value into a heap number. |
| 736 | __ AllocateHeapNumber(edx, esi, no_reg, &gc_required); |
| 737 | // edx: new heap number |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 738 | __ movsd(xmm0, |
| 739 | FieldOperand(edi, ebx, times_4, FixedDoubleArray::kHeaderSize)); |
| 740 | __ movsd(FieldOperand(edx, HeapNumber::kValueOffset), xmm0); |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 741 | __ mov(FieldOperand(eax, ebx, times_2, FixedArray::kHeaderSize), edx); |
| 742 | __ mov(esi, ebx); |
| 743 | __ RecordWriteArray(eax, |
| 744 | edx, |
| 745 | esi, |
| 746 | kDontSaveFPRegs, |
| 747 | EMIT_REMEMBERED_SET, |
| 748 | OMIT_SMI_CHECK); |
| 749 | __ jmp(&entry, Label::kNear); |
| 750 | |
| 751 | // Replace the-hole NaN with the-hole pointer. |
| 752 | __ bind(&convert_hole); |
| 753 | __ mov(FieldOperand(eax, ebx, times_2, FixedArray::kHeaderSize), |
| 754 | masm->isolate()->factory()->the_hole_value()); |
| 755 | |
| 756 | __ bind(&entry); |
| 757 | __ sub(ebx, Immediate(Smi::FromInt(1))); |
| 758 | __ j(not_sign, &loop); |
| 759 | |
| 760 | __ pop(ebx); |
| 761 | __ pop(edx); |
| 762 | // ebx: target map |
| 763 | // edx: receiver |
| 764 | // Set transitioned map. |
| 765 | __ mov(FieldOperand(edx, HeapObject::kMapOffset), ebx); |
| 766 | __ RecordWriteField(edx, |
| 767 | HeapObject::kMapOffset, |
| 768 | ebx, |
| 769 | edi, |
| 770 | kDontSaveFPRegs, |
| 771 | OMIT_REMEMBERED_SET, |
| 772 | OMIT_SMI_CHECK); |
| 773 | // Replace receiver's backing store with newly created and filled FixedArray. |
| 774 | __ mov(FieldOperand(edx, JSObject::kElementsOffset), eax); |
| 775 | __ RecordWriteField(edx, |
| 776 | JSObject::kElementsOffset, |
| 777 | eax, |
| 778 | edi, |
| 779 | kDontSaveFPRegs, |
| 780 | EMIT_REMEMBERED_SET, |
| 781 | OMIT_SMI_CHECK); |
| 782 | |
| 783 | // Restore registers. |
| 784 | __ pop(eax); |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 785 | __ pop(esi); |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 786 | |
| 787 | __ bind(&success); |
| 788 | } |
| 789 | |
| 790 | |
| 791 | void StringCharLoadGenerator::Generate(MacroAssembler* masm, |
| 792 | Factory* factory, |
| 793 | Register string, |
| 794 | Register index, |
| 795 | Register result, |
| 796 | Label* call_runtime) { |
| 797 | // Fetch the instance type of the receiver into result register. |
| 798 | __ mov(result, FieldOperand(string, HeapObject::kMapOffset)); |
| 799 | __ movzx_b(result, FieldOperand(result, Map::kInstanceTypeOffset)); |
| 800 | |
| 801 | // We need special handling for indirect strings. |
| 802 | Label check_sequential; |
| 803 | __ test(result, Immediate(kIsIndirectStringMask)); |
| 804 | __ j(zero, &check_sequential, Label::kNear); |
| 805 | |
| 806 | // Dispatch on the indirect string shape: slice or cons. |
| 807 | Label cons_string; |
| 808 | __ test(result, Immediate(kSlicedNotConsMask)); |
| 809 | __ j(zero, &cons_string, Label::kNear); |
| 810 | |
| 811 | // Handle slices. |
| 812 | Label indirect_string_loaded; |
| 813 | __ mov(result, FieldOperand(string, SlicedString::kOffsetOffset)); |
| 814 | __ SmiUntag(result); |
| 815 | __ add(index, result); |
| 816 | __ mov(string, FieldOperand(string, SlicedString::kParentOffset)); |
| 817 | __ jmp(&indirect_string_loaded, Label::kNear); |
| 818 | |
| 819 | // Handle cons strings. |
| 820 | // Check whether the right hand side is the empty string (i.e. if |
| 821 | // this is really a flat string in a cons string). If that is not |
| 822 | // the case we would rather go to the runtime system now to flatten |
| 823 | // the string. |
| 824 | __ bind(&cons_string); |
| 825 | __ cmp(FieldOperand(string, ConsString::kSecondOffset), |
| 826 | Immediate(factory->empty_string())); |
| 827 | __ j(not_equal, call_runtime); |
| 828 | __ mov(string, FieldOperand(string, ConsString::kFirstOffset)); |
| 829 | |
| 830 | __ bind(&indirect_string_loaded); |
| 831 | __ mov(result, FieldOperand(string, HeapObject::kMapOffset)); |
| 832 | __ movzx_b(result, FieldOperand(result, Map::kInstanceTypeOffset)); |
| 833 | |
| 834 | // Distinguish sequential and external strings. Only these two string |
| 835 | // representations can reach here (slices and flat cons strings have been |
| 836 | // reduced to the underlying sequential or external string). |
| 837 | Label seq_string; |
| 838 | __ bind(&check_sequential); |
| 839 | STATIC_ASSERT(kSeqStringTag == 0); |
| 840 | __ test(result, Immediate(kStringRepresentationMask)); |
| 841 | __ j(zero, &seq_string, Label::kNear); |
| 842 | |
| 843 | // Handle external strings. |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 844 | Label one_byte_external, done; |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 845 | if (FLAG_debug_code) { |
| 846 | // Assert that we do not have a cons or slice (indirect strings) here. |
| 847 | // Sequential strings have already been ruled out. |
| 848 | __ test(result, Immediate(kIsIndirectStringMask)); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 849 | __ Assert(zero, kExternalStringExpectedButNotFound); |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 850 | } |
| 851 | // Rule out short external strings. |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 852 | STATIC_ASSERT(kShortExternalStringTag != 0); |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 853 | __ test_b(result, Immediate(kShortExternalStringMask)); |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 854 | __ j(not_zero, call_runtime); |
| 855 | // Check encoding. |
| 856 | STATIC_ASSERT(kTwoByteStringTag == 0); |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 857 | __ test_b(result, Immediate(kStringEncodingMask)); |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 858 | __ mov(result, FieldOperand(string, ExternalString::kResourceDataOffset)); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 859 | __ j(not_equal, &one_byte_external, Label::kNear); |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 860 | // Two-byte string. |
| 861 | __ movzx_w(result, Operand(result, index, times_2, 0)); |
| 862 | __ jmp(&done, Label::kNear); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 863 | __ bind(&one_byte_external); |
| 864 | // One-byte string. |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 865 | __ movzx_b(result, Operand(result, index, times_1, 0)); |
| 866 | __ jmp(&done, Label::kNear); |
| 867 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 868 | // Dispatch on the encoding: one-byte or two-byte. |
| 869 | Label one_byte; |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 870 | __ bind(&seq_string); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 871 | STATIC_ASSERT((kStringEncodingMask & kOneByteStringTag) != 0); |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 872 | STATIC_ASSERT((kStringEncodingMask & kTwoByteStringTag) == 0); |
| 873 | __ test(result, Immediate(kStringEncodingMask)); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 874 | __ j(not_zero, &one_byte, Label::kNear); |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 875 | |
| 876 | // Two-byte string. |
| 877 | // Load the two-byte character code into the result register. |
| 878 | __ movzx_w(result, FieldOperand(string, |
| 879 | index, |
| 880 | times_2, |
| 881 | SeqTwoByteString::kHeaderSize)); |
| 882 | __ jmp(&done, Label::kNear); |
| 883 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 884 | // One-byte string. |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 885 | // Load the byte into the result register. |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 886 | __ bind(&one_byte); |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 887 | __ movzx_b(result, FieldOperand(string, |
| 888 | index, |
| 889 | times_1, |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 890 | SeqOneByteString::kHeaderSize)); |
| 891 | __ bind(&done); |
| 892 | } |
| 893 | |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 894 | #undef __ |
| 895 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 896 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 897 | CodeAgingHelper::CodeAgingHelper(Isolate* isolate) { |
| 898 | USE(isolate); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 899 | DCHECK(young_sequence_.length() == kNoCodeAgeSequenceLength); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 900 | CodePatcher patcher(isolate, young_sequence_.start(), |
| 901 | young_sequence_.length()); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 902 | patcher.masm()->push(ebp); |
| 903 | patcher.masm()->mov(ebp, esp); |
| 904 | patcher.masm()->push(esi); |
| 905 | patcher.masm()->push(edi); |
| 906 | } |
| 907 | |
| 908 | |
| 909 | #ifdef DEBUG |
| 910 | bool CodeAgingHelper::IsOld(byte* candidate) const { |
| 911 | return *candidate == kCallOpcode; |
| 912 | } |
| 913 | #endif |
| 914 | |
| 915 | |
| 916 | bool Code::IsYoungSequence(Isolate* isolate, byte* sequence) { |
| 917 | bool result = isolate->code_aging_helper()->IsYoung(sequence); |
| 918 | DCHECK(result || isolate->code_aging_helper()->IsOld(sequence)); |
| 919 | return result; |
| 920 | } |
| 921 | |
| 922 | |
| 923 | void Code::GetCodeAgeAndParity(Isolate* isolate, byte* sequence, Age* age, |
| 924 | MarkingParity* parity) { |
| 925 | if (IsYoungSequence(isolate, sequence)) { |
| 926 | *age = kNoAgeCodeAge; |
| 927 | *parity = NO_MARKING_PARITY; |
| 928 | } else { |
| 929 | sequence++; // Skip the kCallOpcode byte |
| 930 | Address target_address = sequence + *reinterpret_cast<int*>(sequence) + |
| 931 | Assembler::kCallTargetAddressOffset; |
| 932 | Code* stub = GetCodeFromTargetAddress(target_address); |
| 933 | GetCodeAgeAndParity(stub, age, parity); |
| 934 | } |
| 935 | } |
| 936 | |
| 937 | |
| 938 | void Code::PatchPlatformCodeAge(Isolate* isolate, |
| 939 | byte* sequence, |
| 940 | Code::Age age, |
| 941 | MarkingParity parity) { |
| 942 | uint32_t young_length = isolate->code_aging_helper()->young_sequence_length(); |
| 943 | if (age == kNoAgeCodeAge) { |
| 944 | isolate->code_aging_helper()->CopyYoungSequenceTo(sequence); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 945 | Assembler::FlushICache(isolate, sequence, young_length); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 946 | } else { |
| 947 | Code* stub = GetCodeAgeStub(isolate, age, parity); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 948 | CodePatcher patcher(isolate, sequence, young_length); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 949 | patcher.masm()->call(stub->instruction_start(), RelocInfo::NONE32); |
| 950 | } |
| 951 | } |
| 952 | |
| 953 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 954 | } // namespace internal |
| 955 | } // namespace v8 |
Leon Clarke | f7060e2 | 2010-06-03 12:02:55 +0100 | [diff] [blame] | 956 | |
| 957 | #endif // V8_TARGET_ARCH_IA32 |