Move IC code into a subdir and move ic-compilation related code from stub-cache into ic-compiler

src/ic/arm64/stub-cache-arm64.cc

+// Copyright 2013 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/v8.h"
+
+#if V8_TARGET_ARCH_ARM64
+
+#include "src/codegen.h"
+#include "src/ic/stub-cache.h"
+
+namespace v8 {
+namespace internal {
+
+
+#define __ ACCESS_MASM(masm)
+
+
+// Probe primary or secondary table.
+// If the entry is found in the cache, the generated code jump to the first
+// instruction of the stub in the cache.
+// If there is a miss the code fall trough.
+//
+// 'receiver', 'name' and 'offset' registers are preserved on miss.
+static void ProbeTable(Isolate* isolate, MacroAssembler* masm,
+                       Code::Flags flags, StubCache::Table table,
+                       Register receiver, Register name, Register offset,
+                       Register scratch, Register scratch2, Register scratch3) {
+  // Some code below relies on the fact that the Entry struct contains
+  // 3 pointers (name, code, map).
+  STATIC_ASSERT(sizeof(StubCache::Entry) == (3 * kPointerSize));
+
+  ExternalReference key_offset(isolate->stub_cache()->key_reference(table));
+  ExternalReference value_offset(isolate->stub_cache()->value_reference(table));
+  ExternalReference map_offset(isolate->stub_cache()->map_reference(table));
+
+  uintptr_t key_off_addr = reinterpret_cast<uintptr_t>(key_offset.address());
+  uintptr_t value_off_addr =
+      reinterpret_cast<uintptr_t>(value_offset.address());
+  uintptr_t map_off_addr = reinterpret_cast<uintptr_t>(map_offset.address());
+
+  Label miss;
+
+  DCHECK(!AreAliased(name, offset, scratch, scratch2, scratch3));
+
+  // Multiply by 3 because there are 3 fields per entry.
+  __ Add(scratch3, offset, Operand(offset, LSL, 1));
+
+  // Calculate the base address of the entry.
+  __ Mov(scratch, key_offset);
+  __ Add(scratch, scratch, Operand(scratch3, LSL, kPointerSizeLog2));
+
+  // Check that the key in the entry matches the name.
+  __ Ldr(scratch2, MemOperand(scratch));
+  __ Cmp(name, scratch2);
+  __ B(ne, &miss);
+
+  // Check the map matches.
+  __ Ldr(scratch2, MemOperand(scratch, map_off_addr - key_off_addr));
+  __ Ldr(scratch3, FieldMemOperand(receiver, HeapObject::kMapOffset));
+  __ Cmp(scratch2, scratch3);
+  __ B(ne, &miss);
+
+  // Get the code entry from the cache.
+  __ Ldr(scratch, MemOperand(scratch, value_off_addr - key_off_addr));
+
+  // Check that the flags match what we're looking for.
+  __ Ldr(scratch2.W(), FieldMemOperand(scratch, Code::kFlagsOffset));
+  __ Bic(scratch2.W(), scratch2.W(), Code::kFlagsNotUsedInLookup);
+  __ Cmp(scratch2.W(), flags);
+  __ B(ne, &miss);
+
+#ifdef DEBUG
+  if (FLAG_test_secondary_stub_cache && table == StubCache::kPrimary) {
+    __ B(&miss);
+  } else if (FLAG_test_primary_stub_cache && table == StubCache::kSecondary) {
+    __ B(&miss);
+  }
+#endif
+
+  // Jump to the first instruction in the code stub.
+  __ Add(scratch, scratch, Code::kHeaderSize - kHeapObjectTag);
+  __ Br(scratch);
+
+  // Miss: fall through.
+  __ Bind(&miss);
+}
+
+
+void StubCache::GenerateProbe(MacroAssembler* masm, Code::Flags flags,
+                              Register receiver, Register name,
+                              Register scratch, Register extra, Register extra2,
+                              Register extra3) {
+  Isolate* isolate = masm->isolate();
+  Label miss;
+
+  // Make sure the flags does not name a specific type.
+  DCHECK(Code::ExtractTypeFromFlags(flags) == 0);
+
+  // Make sure that there are no register conflicts.
+  DCHECK(!AreAliased(receiver, name, scratch, extra, extra2, extra3));
+
+  // Make sure extra and extra2 registers are valid.
+  DCHECK(!extra.is(no_reg));
+  DCHECK(!extra2.is(no_reg));
+  DCHECK(!extra3.is(no_reg));
+
+  Counters* counters = masm->isolate()->counters();
+  __ IncrementCounter(counters->megamorphic_stub_cache_probes(), 1, extra2,
+                      extra3);
+
+  // Check that the receiver isn't a smi.
+  __ JumpIfSmi(receiver, &miss);
+
+  // Compute the hash for primary table.
+  __ Ldr(scratch, FieldMemOperand(name, Name::kHashFieldOffset));
+  __ Ldr(extra, FieldMemOperand(receiver, HeapObject::kMapOffset));
+  __ Add(scratch, scratch, extra);
+  __ Eor(scratch, scratch, flags);
+  // We shift out the last two bits because they are not part of the hash.
+  __ Ubfx(scratch, scratch, kCacheIndexShift,
+          CountTrailingZeros(kPrimaryTableSize, 64));
+
+  // Probe the primary table.
+  ProbeTable(isolate, masm, flags, kPrimary, receiver, name, scratch, extra,
+             extra2, extra3);
+
+  // Primary miss: Compute hash for secondary table.
+  __ Sub(scratch, scratch, Operand(name, LSR, kCacheIndexShift));
+  __ Add(scratch, scratch, flags >> kCacheIndexShift);
+  __ And(scratch, scratch, kSecondaryTableSize - 1);
+
+  // Probe the secondary table.
+  ProbeTable(isolate, masm, flags, kSecondary, receiver, name, scratch, extra,
+             extra2, extra3);
+
+  // Cache miss: Fall-through and let caller handle the miss by
+  // entering the runtime system.
+  __ Bind(&miss);
+  __ IncrementCounter(counters->megamorphic_stub_cache_misses(), 1, extra2,
+                      extra3);
+}
+}
+}  // namespace v8::internal
+
+#endif  // V8_TARGET_ARCH_ARM64