ARM: Add GYP variables to control V8 code generation

tools/gyp/v8.gyp

 # Copyright 2011 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
@@ skipping 14 matching lines @@
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 {
   'variables': {
     'use_system_v8%': 0,
     'msvs_use_common_release': 0,
     'gcc_version%': 'unknown',
     'v8_compress_startup_data%': 'false',
     'v8_target_arch%': '<(target_arch)',
+
+    # Setting 'v8_can_use_unaligned_accesses' to 'true' will allow the code
+    # generated by V8 to do unaligned memory access, and setting it to 'false'
+    # will ensure that the generated code will always do aligned memory
+    # accesses. The default value of 'default' will try to determine the correct
+    # setting. Note that for Intel architectures (ia32 and x64) unaligned memory
+    # access is allowed for all CPUs.
+    'v8_can_use_unaligned_accesses%': 'default',
+
+    # Setting 'v8_can_use_vfp_instructions' to 'true' will enable use of ARM VFP
+    # instructions in the V8 generated code. VFP instructions will be enabled
+    # both for the snapshot and for the ARM target. Leaving the default value
+    # of 'false' will avoid VFP instructions in the snapshot and use CPU feature
+    # probing when running on the target.
     'v8_can_use_vfp_instructions%': 'false',
+
+    # Setting v8_use_arm_eabi_hardfloat to true will turn on V8 support for ARM
+    # EABI calling convention where double arguments are passed in VFP
+    # registers. Note that the GCC flag '-mfloat-abi=hard' should be used as
+    # well when compiling for the ARM target.
+    'v8_use_arm_eabi_hardfloat%': 'false',
+
     'v8_use_snapshot%': 'true',
     'v8_use_liveobjectlist%': 'false',
   },
   'conditions': [
     ['use_system_v8==0', {
       'target_defaults': {
         'defines': [
           'ENABLE_LOGGING_AND_PROFILING',
           'ENABLE_DEBUGGER_SUPPORT',
           'ENABLE_VMSTATE_TRACKING',
           'V8_FAST_TLS',
         ],
         'conditions': [
           ['OS!="mac"', {
             # TODO(mark): The OS!="mac" conditional is temporary. It can be
             # removed once the Mac Chromium build stops setting target_arch to
             # ia32 and instead sets it to mac. Other checks in this file for
             # OS=="mac" can be removed at that time as well. This can be cleaned
             # up once http://crbug.com/44205 is fixed.
             'conditions': [
               ['v8_target_arch=="arm"', {
                 'defines': [
                   'V8_TARGET_ARCH_ARM',
                 ],
                 'conditions': [
+                  [ 'v8_can_use_unaligned_accesses=="true"', {
+                    'defines': [
+                      'CAN_USE_UNALIGNED_ACCESSES=1',
+                    ],
+                  }],
+                  [ 'v8_can_use_unaligned_accesses=="false"', {
+                    'defines': [
+                      'CAN_USE_UNALIGNED_ACCESSES=0',
+                    ],
+                  }],
                   [ 'v8_can_use_vfp_instructions=="true"', {
                     'defines': [
                       'CAN_USE_VFP_INSTRUCTIONS',
                     ],
                   }],
+                  [ 'v8_use_arm_eabi_hardfloat=="true"', {
+                    'defines': [
+                      'USE_EABI_HARDFLOAT=1',
+                      'CAN_USE_VFP_INSTRUCTIONS',
+                    ],
+                  }],
                 ],
               }],
               ['v8_target_arch=="ia32"', {
                 'defines': [
                   'V8_TARGET_ARCH_IA32',
                 ],
               }],
               ['v8_target_arch=="x64"', {
                 'defines': [
                   'V8_TARGET_ARCH_X64',
@@ skipping 698 matching lines @@
               '../../src/messages.js',
               '../../src/apinatives.js',
               '../../src/debug-debugger.js',
               '../../src/mirror-debugger.js',
               '../../src/liveedit-debugger.js',
               '../../src/date.js',
               '../../src/json.js',
               '../../src/regexp.js',
               '../../src/macros.py',
             ],
-            'experimental_library_files': [
-              '../../src/proxy.js',
+            'experimental_library_files': [
+              '../../src/proxy.js',
               '../../src/macros.py',
-            ],
+            ],
           },
           'actions': [
             {
               'action_name': 'js2c',
               'inputs': [
                 '../../tools/js2c.py',
                 '<@(library_files)',
               ],
               'outputs': [
                 '<(SHARED_INTERMEDIATE_DIR)/libraries.cc',
               ],
               'action': [
                 'python',
                 '../../tools/js2c.py',
                 '<@(_outputs)',
                 'CORE',
                 '<@(library_files)'
               ],
             },
-            {
+            {
               'action_name': 'js2c_experimental',
               'inputs': [
                 '../../tools/js2c.py',
                 '<@(experimental_library_files)',
               ],
               'outputs': [
                 '<(SHARED_INTERMEDIATE_DIR)/experimental-libraries.cc',
               ],
               'action': [
                 'python',
@@ skipping 67 matching lines @@
           'target_name': 'v8_shell',
           'type': 'none',
           'dependencies': [
             'v8'
           ],
         },
       ],
     }],
   ],
 }