[build] Add v8gen support for PPC/s390 architecture

Add PPC/s390 configs to mb_config and BUILD.gn. Also
use a script to get host byte ordering.

R=machenbach@chromium.org, dpranke@chromium.org
BUG=
LOG=N

Review-Url: https://codereview.chromium.org/2736993004
Cr-Commit-Position: refs/heads/master@{#43751}

.gn

@@ -21,5 +21,7 @@ check_targets = []
 # These are the list of GN files that run exec_script. This whitelist exists
 # to force additional review for new uses of exec_script, which is strongly
 # discouraged except for gypi_to_gn calls.
-exec_script_whitelist =
+exec_script_whitelist = build_dotfile_settings.exec_script_whitelist + [
-    build_dotfile_settings.exec_script_whitelist + [ "//test/test262/BUILD.gn" ]
+                          "//test/test262/BUILD.gn",
+                          "//BUILD.gn",
+                        ]

BUILD.gn

@@ -104,6 +104,19 @@ declare_args() {
   v8_enable_gdbjit = ((v8_current_cpu == "x86" || v8_current_cpu == "x64" ||
                        v8_current_cpu == "x87") && (is_linux || is_mac)) ||
                      (v8_current_cpu == "ppc64" && is_linux)
+
+  # Set v8_host_byteorder
+  v8_host_byteorder = "little"
+
+  # ppc64 can be either BE or LE
+  if (host_cpu == "ppc64") {
+    v8_host_byteorder =
+        exec_script("//tools/get_byteorder.py", [], "trim string")
+  }
+  if (host_cpu == "ppc" || host_cpu == "s390" || host_cpu == "s390x" ||
+      host_cpu == "mips" || host_cpu == "mips64") {
+    v8_host_byteorder = "big"
+  }
 }
 
 # Derived defaults.
@@ -361,8 +374,31 @@ config("toolchain") {
     if (v8_current_cpu == "s390x") {
       defines += [ "V8_TARGET_ARCH_S390X" ]
     }
-    if (host_cpu == "x64" || host_cpu == "x86") {
+    if (v8_host_byteorder == "little") {
       defines += [ "V8_TARGET_ARCH_S390_LE_SIM" ]
+    } else {
+      cflags += [ "-march=z196" ]
+    }
+  }
+  if (v8_current_cpu == "ppc" || v8_current_cpu == "ppc64") {
+    defines += [ "V8_TARGET_ARCH_PPC" ]
+    if (v8_current_cpu == "ppc64") {
+      defines += [ "V8_TARGET_ARCH_PPC64" ]
+    }
+    if (v8_host_byteorder == "little") {
+      defines += [ "V8_TARGET_ARCH_PPC_LE" ]
+    } else if (v8_host_byteorder == "big") {
+      defines += [ "V8_TARGET_ARCH_PPC_BE" ]
+      if (current_os == "aix") {
+        cflags += [
+          # Work around AIX ceil, trunc and round oddities.
+          "-mcpu=power5+",
+          "-mfprnd",
+
+          # Work around AIX assembler popcntb bug.
+          "-mno-popcntb",
+        ]
+      }
     }
   }
   if (v8_current_cpu == "x86") {

infra/mb/mb_config.pyl

@@ -24,6 +24,18 @@
       'mips64el.debug': 'default_debug_mips64el',
       'mips64el.optdebug': 'default_optdebug_mips64el',
       'mips64el.release': 'default_release_mips64el',
+      'ppc.debug': 'default_debug_ppc',
+      'ppc.optdebug': 'default_optdebug_ppc',
+      'ppc.release': 'default_release_ppc',
+      'ppc64.debug': 'default_debug_ppc64',
+      'ppc64.optdebug': 'default_optdebug_ppc64',
+      'ppc64.release': 'default_release_ppc64',
+      's390.debug': 'default_debug_s390',
+      's390.optdebug': 'default_optdebug_s390',
+      's390.release': 'default_release_s390',
+      's390x.debug': 'default_debug_s390x',
+      's390x.optdebug': 'default_optdebug_s390x',
+      's390x.release': 'default_release_s390x',
       'x64.debug': 'default_debug_x64',
       'x64.optdebug': 'default_optdebug_x64',
       'x64.release': 'default_release_x64',
@@ -234,6 +246,34 @@
       'gn', 'debug', 'simulate_mips64el', 'v8_enable_slow_dchecks'],
     'default_release_mips64el': [
       'gn', 'release', 'simulate_mips64el'],
+    'default_debug_ppc': [
+      'gn', 'debug', 'simulate_ppc', 'v8_enable_slow_dchecks',
+      'v8_full_debug'],
+    'default_optdebug_ppc': [
+      'gn', 'debug', 'simulate_ppc', 'v8_enable_slow_dchecks'],
+    'default_release_ppc': [
+      'gn', 'release', 'simulate_ppc'],
+    'default_debug_ppc64': [
+      'gn', 'debug', 'simulate_ppc64', 'v8_enable_slow_dchecks',
+      'v8_full_debug'],
+    'default_optdebug_ppc64': [
+      'gn', 'debug', 'simulate_ppc64', 'v8_enable_slow_dchecks'],
+    'default_release_ppc64': [
+      'gn', 'release', 'simulate_ppc64'],
+    'default_debug_s390': [
+      'gn', 'debug', 'simulate_s390', 'v8_enable_slow_dchecks',
+      'v8_full_debug'],
+    'default_optdebug_s390': [
+      'gn', 'debug', 'simulate_s390', 'v8_enable_slow_dchecks'],
+    'default_release_s390': [
+      'gn', 'release', 'simulate_s390'],
+    'default_debug_s390x': [
+      'gn', 'debug', 'simulate_s390x', 'v8_enable_slow_dchecks',
+      'v8_full_debug'],
+    'default_optdebug_s390x': [
+      'gn', 'debug', 'simulate_s390x', 'v8_enable_slow_dchecks'],
+    'default_release_s390x': [
+      'gn', 'release', 'simulate_s390x'],
     'default_debug_x64': [
       'gn', 'debug', 'x64', 'v8_enable_slow_dchecks', 'v8_full_debug'],
     'default_optdebug_x64': [

tools/get_byteorder.py

@@ -0,0 +1,17 @@
+#!/usr/bin/env python
+#
+# Copyright 2017 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.
+
+"""Get Byteorder of host architecture"""
+
+
+import sys
+
+def main():
+  print sys.byteorder
+  return 0
+
+if __name__ == '__main__':
+  sys.exit(main())