scripts/tracetool/transform.py

   1 # -*- coding: utf-8 -*-
   2
   3 """
   4 Type-transformation rules.
   5 """
   6
   7 __author__     = "Lluís Vilanova <vilanova@ac.upc.edu>"
   8 __copyright__  = "Copyright 2012-2016, Lluís Vilanova <vilanova@ac.upc.edu>"
   9 __license__    = "GPL version 2 or (at your option) any later version"
  10
  11 __maintainer__ = "Stefan Hajnoczi"
  12 __email__      = "stefanha@redhat.com"
  13
  14
  15 def _transform_type(type_, trans):
  16     if isinstance(trans, str):
  17         return trans
  18     elif isinstance(trans, dict):
  19         if type_ in trans:
  20             return _transform_type(type_, trans[type_])
  21         elif None in trans:
  22             return _transform_type(type_, trans[None])
  23         else:
  24             return type_
  25     elif callable(trans):
  26         return trans(type_)
  27     else:
  28         raise ValueError("Invalid type transformation rule: %s" % trans)
  29
  30
  31 def transform_type(type_, *trans):
  32     """Return a new type transformed according to the given rules.
  33
  34     Applies each of the transformation rules in trans in order.
  35
  36     If an element of trans is a string, return it.
  37
  38     If an element of trans is a function, call it with type_ as its only
  39     argument.
  40
  41     If an element of trans is a dict, search type_ in its keys. If type_ is
  42     a key, use the value as a transformation rule for type_. Otherwise, if
  43     None is a key use the value as a transformation rule for type_.
  44
  45     Otherwise, return type_.
  46
  47     Parameters
  48     ----------
  49     type_ : str
  50         Type to transform.
  51     trans : list of function or dict
  52         Type transformation rules.
  53     """
  54     if len(trans) == 0:
  55         raise ValueError
  56     res = type_
  57     for t in trans:
  58         res = _transform_type(res, t)
  59     return res
  60
  61
  62 ##################################################
  63 # tcg -> host
  64
  65 def _tcg_2_host(type_):
  66     if type_ == "TCGv":
  67         # force a fixed-size type (target-independent)
  68         return "uint64_t"
  69     else:
  70         return type_
  71
  72 TCG_2_HOST = {
  73     "TCGv_i32": "uint32_t",
  74     "TCGv_i64": "uint64_t",
  75     "TCGv_ptr": "void *",
  76     None: _tcg_2_host,
  77     }
  78
  79
  80 ##################################################
  81 # host -> host compatible with tcg sizes
  82
  83 HOST_2_TCG_COMPAT = {
  84     "uint8_t": "uint32_t",
  85     "uint16_t": "uint32_t",
  86     }
  87
  88
  89 ##################################################
  90 # host/tcg -> tcg
  91
  92 def _host_2_tcg(type_):
  93     if type_.startswith("TCGv"):
  94         return type_
  95     raise ValueError("Don't know how to translate '%s' into a TCG type\n" % type_)
  96
  97 HOST_2_TCG = {
  98     "uint32_t": "TCGv_i32",
  99     "uint64_t": "TCGv_i64",
 100     "void *"  : "TCGv_ptr",
 101     "CPUArchState *": "TCGv_env",
 102     None: _host_2_tcg,
 103     }
 104
 105
 106 ##################################################
 107 # tcg -> tcg helper definition
 108
 109 def _tcg_2_helper_def(type_):
 110     if type_ == "TCGv":
 111         return "target_ulong"
 112     else:
 113         return type_
 114
 115 TCG_2_TCG_HELPER_DEF = {
 116     "TCGv_i32": "uint32_t",
 117     "TCGv_i64": "uint64_t",
 118     "TCGv_ptr": "void *",
 119     None: _tcg_2_helper_def,
 120     }
 121
 122
 123 ##################################################
 124 # tcg -> tcg helper declaration
 125
 126 def _tcg_2_tcg_helper_decl_error(type_):
 127     raise ValueError("Don't know how to translate type '%s' into a TCG helper declaration type\n" % type_)
 128
 129 TCG_2_TCG_HELPER_DECL = {
 130     "TCGv"    : "tl",
 131     "TCGv_ptr": "ptr",
 132     "TCGv_i32": "i32",
 133     "TCGv_i64": "i64",
 134     "TCGv_env": "env",
 135     None: _tcg_2_tcg_helper_decl_error,
 136     }
 137
 138
 139 ##################################################
 140 # host/tcg -> tcg temporal constant allocation
 141
 142 def _host_2_tcg_tmp_new(type_):
 143     if type_.startswith("TCGv"):
 144         return "tcg_temp_new_nop"
 145     raise ValueError("Don't know how to translate type '%s' into a TCG temporal allocation" % type_)
 146
 147 HOST_2_TCG_TMP_NEW = {
 148     "uint32_t": "tcg_const_i32",
 149     "uint64_t": "tcg_const_i64",
 150     "void *"  : "tcg_const_ptr",
 151     None: _host_2_tcg_tmp_new,
 152     }
 153
 154
 155 ##################################################
 156 # host/tcg -> tcg temporal constant deallocation
 157
 158 def _host_2_tcg_tmp_free(type_):
 159     if type_.startswith("TCGv"):
 160         return "tcg_temp_free_nop"
 161     raise ValueError("Don't know how to translate type '%s' into a TCG temporal deallocation" % type_)
 162
 163 HOST_2_TCG_TMP_FREE = {
 164     "uint32_t": "tcg_temp_free_i32",
 165     "uint64_t": "tcg_temp_free_i64",
 166     "void *"  : "tcg_temp_free_ptr",
 167     None: _host_2_tcg_tmp_free,
 168     }