[turbofan] Initial version of allocation folding and write barrier elimination.

BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/android/config.gni")
 import("//build/config/arm.gni")
 import("//build/config/mips.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 
 if (is_android) {
@@ skipping 176 matching lines @@
         "CAN_USE_VFP3_INSTRUCTIONS",
         "CAN_USE_VFP32DREGS",
       ]
     } else if (arm_fpu == "neon") {
       defines += [
         "CAN_USE_VFP3_INSTRUCTIONS",
         "CAN_USE_VFP32DREGS",
         "CAN_USE_NEON",
       ]
     }
+
     # TODO(jochen): Add support for arm_test_noprobe.
 
     if (current_cpu != "arm") {
       # These defines ares used for the ARM simulator.
       if (arm_float_abi == "hard") {
         defines += [ "USE_EABI_HARDFLOAT=1" ]
       } else if (arm_float_abi == "softfp") {
         defines += [ "USE_EABI_HARDFLOAT=0" ]
       }
     }
   }
   if (v8_target_arch == "arm64") {
     defines += [ "V8_TARGET_ARCH_ARM64" ]
   }
+
   # TODO(jochen): Add support for mips.
   if (v8_target_arch == "mipsel") {
     defines += [ "V8_TARGET_ARCH_MIPS" ]
     if (v8_can_use_fpu_instructions) {
       defines += [ "CAN_USE_FPU_INSTRUCTIONS" ]
     }
     if (v8_use_mips_abi_hardfloat) {
       defines += [
         "__mips_hard_float=1",
         "CAN_USE_FPU_INSTRUCTIONS",
@@ skipping 11 matching lines @@
       if (mips_fpu_mode == "fp64") {
         defines += [ "FPU_MODE_FP64" ]
       } else if (mips_fpu_mode == "fpxx") {
         defines += [ "FPU_MODE_FPXX" ]
       } else if (mips_fpu_mode == "fp32") {
         defines += [ "FPU_MODE_FP32" ]
       }
     } else if (mips_arch_variant == "r1") {
       defines += [ "FPU_MODE_FP32" ]
     }
+
     # TODO(jochen): Add support for mips_arch_variant rx and loongson.
   }
+
   # TODO(jochen): Add support for mips64.
   if (v8_target_arch == "mips64el") {
     defines += [ "V8_TARGET_ARCH_MIPS64" ]
     if (v8_can_use_fpu_instructions) {
       defines += [ "CAN_USE_FPU_INSTRUCTIONS" ]
     }
+
     # TODO(jochen): Add support for big endian host byteorder.
     defines += [ "V8_TARGET_ARCH_MIPS64_LE" ]
     if (v8_use_mips_abi_hardfloat) {
       defines += [
         "__mips_hard_float=1",
         "CAN_USE_FPU_INSTRUCTIONS",
       ]
     } else {
       defines += [ "__mips_soft_float=1" ]
     }
@@ skipping 568 matching lines @@
     "src/compiler/ast-loop-assignment-analyzer.h",
     "src/compiler/basic-block-instrumentor.cc",
     "src/compiler/basic-block-instrumentor.h",
     "src/compiler/branch-elimination.cc",
     "src/compiler/branch-elimination.h",
     "src/compiler/bytecode-branch-analysis.cc",
     "src/compiler/bytecode-branch-analysis.h",
     "src/compiler/bytecode-graph-builder.cc",
     "src/compiler/bytecode-graph-builder.h",
     "src/compiler/c-linkage.cc",
-    "src/compiler/change-lowering.cc",
-    "src/compiler/change-lowering.h",
     "src/compiler/coalesced-live-ranges.cc",
     "src/compiler/coalesced-live-ranges.h",
     "src/compiler/code-assembler.cc",
     "src/compiler/code-assembler.h",
     "src/compiler/code-generator-impl.h",
     "src/compiler/code-generator.cc",
     "src/compiler/code-generator.h",
     "src/compiler/common-node-cache.cc",
     "src/compiler/common-node-cache.h",
     "src/compiler/common-operator-reducer.cc",
@@ skipping 83 matching lines @@
     "src/compiler/liveness-analyzer.h",
     "src/compiler/load-elimination.cc",
     "src/compiler/load-elimination.h",
     "src/compiler/loop-analysis.cc",
     "src/compiler/loop-analysis.h",
     "src/compiler/loop-peeling.cc",
     "src/compiler/machine-operator-reducer.cc",
     "src/compiler/machine-operator-reducer.h",
     "src/compiler/machine-operator.cc",
     "src/compiler/machine-operator.h",
+    "src/compiler/memory-optimizer.cc",
+    "src/compiler/memory-optimizer.h",
     "src/compiler/move-optimizer.cc",
     "src/compiler/move-optimizer.h",
     "src/compiler/node-aux-data.h",
     "src/compiler/node-cache.cc",
     "src/compiler/node-cache.h",
     "src/compiler/node-marker.cc",
     "src/compiler/node-marker.h",
     "src/compiler/node-matchers.cc",
     "src/compiler/node-matchers.h",
     "src/compiler/node-properties.cc",
@@ skipping 1168 matching lines @@
 
     if (!is_component_build) {
       sources += [ "$target_gen_dir/d8-js.cc" ]
     }
     if (v8_enable_i18n_support) {
       deps += [ "//third_party/icu" ]
     }
   }
 }
 
-if ((current_toolchain == host_toolchain && v8_toolset_for_shell == "host") ||
-    (current_toolchain == snapshot_toolchain && v8_toolset_for_shell == "host") ||
-    (current_toolchain != host_toolchain && v8_toolset_for_shell == "target")) {
+if ((current_toolchain == host_toolchain && v8_toolset_for_shell == "host") || (current_toolchain == snapshot_toolchain && v8_toolset_for_shell == "host") || (current_toolchain != host_toolchain && v8_toolset_for_shell == "target")) {
   executable("shell") {
     sources = [
       "samples/shell.cc",
     ]
 
     configs -= [ "//build/config/compiler:chromium_code" ]
     configs += [ "//build/config/compiler:no_chromium_code" ]
     configs += [
       # Note: don't use :internal_config here because this target will get
       # the :external_config applied to it by virtue of depending on :v8, and
@@ skipping 103 matching lines @@
 
   configs -= [ "//build/config/compiler:chromium_code" ]
   configs += [ "//build/config/compiler:no_chromium_code" ]
   configs += [
     ":internal_config",
     ":libplatform_config",
     ":features",
     ":toolchain",
   ]
 }