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

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

+// Copyright 2012 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "src/v8.h"
+
+#if V8_TARGET_ARCH_ARM
+
+#include "src/codegen.h"
+#include "src/ic/stub-cache.h"
+
+namespace v8 {
+namespace internal {
+
+#define __ ACCESS_MASM(masm)
+
+
+static void ProbeTable(Isolate* isolate, MacroAssembler* masm,
+                       Code::Flags flags, StubCache::Table table,
+                       Register receiver, Register name,
+                       // Number of the cache entry, not scaled.
+                       Register offset, Register scratch, Register scratch2,
+                       Register offset_scratch) {
+  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));
+
+  uint32_t key_off_addr = reinterpret_cast<uint32_t>(key_offset.address());
+  uint32_t value_off_addr = reinterpret_cast<uint32_t>(value_offset.address());
+  uint32_t map_off_addr = reinterpret_cast<uint32_t>(map_offset.address());
+
+  // Check the relative positions of the address fields.
+  DCHECK(value_off_addr > key_off_addr);
+  DCHECK((value_off_addr - key_off_addr) % 4 == 0);
+  DCHECK((value_off_addr - key_off_addr) < (256 * 4));
+  DCHECK(map_off_addr > key_off_addr);
+  DCHECK((map_off_addr - key_off_addr) % 4 == 0);
+  DCHECK((map_off_addr - key_off_addr) < (256 * 4));
+
+  Label miss;
+  Register base_addr = scratch;
+  scratch = no_reg;
+
+  // Multiply by 3 because there are 3 fields per entry (name, code, map).
+  __ add(offset_scratch, offset, Operand(offset, LSL, 1));
+
+  // Calculate the base address of the entry.
+  __ mov(base_addr, Operand(key_offset));
+  __ add(base_addr, base_addr, Operand(offset_scratch, LSL, kPointerSizeLog2));
+
+  // Check that the key in the entry matches the name.
+  __ ldr(ip, MemOperand(base_addr, 0));
+  __ cmp(name, ip);
+  __ b(ne, &miss);
+
+  // Check the map matches.
+  __ ldr(ip, MemOperand(base_addr, map_off_addr - key_off_addr));
+  __ ldr(scratch2, FieldMemOperand(receiver, HeapObject::kMapOffset));
+  __ cmp(ip, scratch2);
+  __ b(ne, &miss);
+
+  // Get the code entry from the cache.
+  Register code = scratch2;
+  scratch2 = no_reg;
+  __ ldr(code, MemOperand(base_addr, value_off_addr - key_off_addr));
+
+  // Check that the flags match what we're looking for.
+  Register flags_reg = base_addr;
+  base_addr = no_reg;
+  __ ldr(flags_reg, FieldMemOperand(code, Code::kFlagsOffset));
+  // It's a nice optimization if this constant is encodable in the bic insn.
+
+  uint32_t mask = Code::kFlagsNotUsedInLookup;
+  DCHECK(__ ImmediateFitsAddrMode1Instruction(mask));
+  __ bic(flags_reg, flags_reg, Operand(mask));
+  __ cmp(flags_reg, Operand(flags));
+  __ b(ne, &miss);
+
+#ifdef DEBUG
+  if (FLAG_test_secondary_stub_cache && table == StubCache::kPrimary) {
+    __ jmp(&miss);
+  } else if (FLAG_test_primary_stub_cache && table == StubCache::kSecondary) {
+    __ jmp(&miss);
+  }
+#endif
+
+  // Jump to the first instruction in the code stub.
+  __ add(pc, code, Operand(Code::kHeaderSize - kHeapObjectTag));
+
+  // 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 that code is valid. The multiplying code relies on the
+  // entry size being 12.
+  DCHECK(sizeof(Entry) == 12);
+
+  // Make sure the flags does not name a specific type.
+  DCHECK(Code::ExtractTypeFromFlags(flags) == 0);
+
+  // Make sure that there are no register conflicts.
+  DCHECK(!scratch.is(receiver));
+  DCHECK(!scratch.is(name));
+  DCHECK(!extra.is(receiver));
+  DCHECK(!extra.is(name));
+  DCHECK(!extra.is(scratch));
+  DCHECK(!extra2.is(receiver));
+  DCHECK(!extra2.is(name));
+  DCHECK(!extra2.is(scratch));
+  DCHECK(!extra2.is(extra));
+
+  // Check scratch, extra and extra2 registers are valid.
+  DCHECK(!scratch.is(no_reg));
+  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);
+
+  // Get the map of the receiver and compute the hash.
+  __ ldr(scratch, FieldMemOperand(name, Name::kHashFieldOffset));
+  __ ldr(ip, FieldMemOperand(receiver, HeapObject::kMapOffset));
+  __ add(scratch, scratch, Operand(ip));
+  uint32_t mask = kPrimaryTableSize - 1;
+  // We shift out the last two bits because they are not part of the hash and
+  // they are always 01 for maps.
+  __ mov(scratch, Operand(scratch, LSR, kCacheIndexShift));
+  // Mask down the eor argument to the minimum to keep the immediate
+  // ARM-encodable.
+  __ eor(scratch, scratch, Operand((flags >> kCacheIndexShift) & mask));
+  // Prefer and_ to ubfx here because ubfx takes 2 cycles.
+  __ and_(scratch, scratch, Operand(mask));
+
+  // Probe the primary table.
+  ProbeTable(isolate, masm, flags, kPrimary, receiver, name, scratch, extra,
+             extra2, extra3);
+
+  // Primary miss: Compute hash for secondary probe.
+  __ sub(scratch, scratch, Operand(name, LSR, kCacheIndexShift));
+  uint32_t mask2 = kSecondaryTableSize - 1;
+  __ add(scratch, scratch, Operand((flags >> kCacheIndexShift) & mask2));
+  __ and_(scratch, scratch, Operand(mask2));
+
+  // 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);
+}
+
+
+#undef __
+}
+}  // namespace v8::internal
+
+#endif  // V8_TARGET_ARCH_ARM