/js/src/methodjit/MethodJIT-inl.h

http://github.com/zpao/v8monkey · C Header · 108 lines · 53 code · 8 blank · 47 comment · 19 complexity · d316adb963efc610402166b538639559 MD5 · raw file

  1. /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
  2. * vim: set ts=4 sw=4 et tw=99:
  3. *
  4. * ***** BEGIN LICENSE BLOCK *****
  5. * Version: MPL 1.1/GPL 2.0/LGPL 2.1
  6. *
  7. * The contents of this file are subject to the Mozilla Public License Version
  8. * 1.1 (the "License"); you may not use this file except in compliance with
  9. * the License. You may obtain a copy of the License at
  10. * http://www.mozilla.org/MPL/
  11. *
  12. * Software distributed under the License is distributed on an "AS IS" basis,
  13. * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
  14. * for the specific language governing rights and limitations under the
  15. * License.
  16. *
  17. * The Original Code is Mozilla SpiderMonkey JavaScript 1.9 code, released
  18. * May 28, 2008.
  19. *
  20. * The Initial Developer of the Original Code is
  21. * Brendan Eich <brendan@mozilla.org>
  22. *
  23. * Contributor(s):
  24. * David Anderson <danderson@mozilla.com>
  25. * David Mandelin <dmandelin@mozilla.com>
  26. *
  27. * Alternatively, the contents of this file may be used under the terms of
  28. * either of the GNU General Public License Version 2 or later (the "GPL"),
  29. * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
  30. * in which case the provisions of the GPL or the LGPL are applicable instead
  31. * of those above. If you wish to allow use of your version of this file only
  32. * under the terms of either the GPL or the LGPL, and not to allow others to
  33. * use your version of this file under the terms of the MPL, indicate your
  34. * decision by deleting the provisions above and replace them with the notice
  35. * and other provisions required by the GPL or the LGPL. If you do not delete
  36. * the provisions above, a recipient may use your version of this file under
  37. * the terms of any one of the MPL, the GPL or the LGPL.
  38. *
  39. * ***** END LICENSE BLOCK ***** */
  40. #if !defined jsjaeger_methodjit_inl_h__ && defined JS_METHODJIT
  41. #define jsjaeger_methodjit_inl_h__
  42. namespace js {
  43. namespace mjit {
  44. enum CompileRequest
  45. {
  46. CompileRequest_Interpreter,
  47. CompileRequest_JIT
  48. };
  49. /*
  50. * We wait before compiling a function with Type Inference to allow more gathering
  51. * of type information and less recompilation.
  52. */
  53. static const size_t USES_BEFORE_COMPILE = 16;
  54. static const size_t INFER_USES_BEFORE_COMPILE = 40;
  55. static inline CompileStatus
  56. CanMethodJIT(JSContext *cx, JSScript *script, bool construct, CompileRequest request)
  57. {
  58. if (!cx->methodJitEnabled)
  59. return Compile_Abort;
  60. JITScriptStatus status = script->getJITStatus(construct);
  61. if (status == JITScript_Invalid)
  62. return Compile_Abort;
  63. if (request == CompileRequest_Interpreter && status == JITScript_None &&
  64. !cx->hasRunOption(JSOPTION_METHODJIT_ALWAYS) &&
  65. (cx->typeInferenceEnabled()
  66. ? script->incUseCount() <= INFER_USES_BEFORE_COMPILE
  67. : script->incUseCount() <= USES_BEFORE_COMPILE))
  68. {
  69. return Compile_Skipped;
  70. }
  71. if (status == JITScript_None)
  72. return TryCompile(cx, script, construct);
  73. return Compile_Okay;
  74. }
  75. /*
  76. * Called from a backedge in the interpreter to decide if we should transition to the
  77. * methodjit. If so, we compile the given function.
  78. */
  79. static inline CompileStatus
  80. CanMethodJITAtBranch(JSContext *cx, JSScript *script, StackFrame *fp, jsbytecode *pc)
  81. {
  82. if (!cx->methodJitEnabled)
  83. return Compile_Abort;
  84. JITScriptStatus status = script->getJITStatus(fp->isConstructing());
  85. if (status == JITScript_Invalid)
  86. return Compile_Abort;
  87. if (status == JITScript_None && !cx->hasRunOption(JSOPTION_METHODJIT_ALWAYS)) {
  88. if ((cx->typeInferenceEnabled())
  89. ? script->incUseCount() <= INFER_USES_BEFORE_COMPILE
  90. : script->incUseCount() <= USES_BEFORE_COMPILE) {
  91. return Compile_Skipped;
  92. }
  93. }
  94. if (status == JITScript_None)
  95. return TryCompile(cx, fp->script(), fp->isConstructing());
  96. return Compile_Okay;
  97. }
  98. }
  99. }
  100. #endif