decodetree: Move semantic propagation into classes
Create ExcMultiPattern to hold an set of non-overlapping patterns. The body of build_tree, prop_format become member functions on this class. Add minimal member functions to Pattern and MultiPattern to allow recusion through the tree. Move the bulk of build_incmulti_pattern to prop_masks and prop_width in MultiPattern, since we will need this for both kinds of containers. Only perform prop_width for variablewidth. Remove global patterns variable, and pass down container object into parse_file from main. No functional change in all of this. Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson
parent
b44b3449a0
commit
08561fc128
@ -31,7 +31,6 @@ variablewidth = False
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fields = {}
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arguments = {}
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formats = {}
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patterns = []
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allpatterns = []
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anyextern = False
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@ -371,16 +370,27 @@ class Pattern(General):
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output(ind, 'u.f_', arg, '.', n, ' = ', f.str_extract(), ';\n')
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output(ind, 'if (', translate_prefix, '_', self.name,
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'(ctx, &u.f_', arg, ')) return true;\n')
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# Normal patterns do not have children.
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def build_tree(self):
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return
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def prop_masks(self):
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return
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def prop_format(self):
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return
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def prop_width(self):
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return
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# end Pattern
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class MultiPattern(General):
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"""Class representing a set of instruction patterns"""
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def __init__(self, lineno, pats):
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def __init__(self, lineno):
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self.file = input_file
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self.lineno = lineno
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self.pats = pats
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self.pats = []
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self.base = None
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self.fixedbits = 0
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self.fixedmask = 0
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@ -396,22 +406,63 @@ class MultiPattern(General):
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def output_decl(self):
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for p in self.pats:
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p.output_decl()
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def prop_masks(self):
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global insnmask
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fixedmask = insnmask
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undefmask = insnmask
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# Collect fixedmask/undefmask for all of the children.
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for p in self.pats:
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p.prop_masks()
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fixedmask &= p.fixedmask
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undefmask &= p.undefmask
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# Widen fixedmask until all fixedbits match
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repeat = True
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fixedbits = 0
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while repeat and fixedmask != 0:
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fixedbits = None
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for p in self.pats:
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thisbits = p.fixedbits & fixedmask
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if fixedbits is None:
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fixedbits = thisbits
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elif fixedbits != thisbits:
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fixedmask &= ~(fixedbits ^ thisbits)
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break
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else:
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repeat = False
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self.fixedbits = fixedbits
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self.fixedmask = fixedmask
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self.undefmask = undefmask
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def build_tree(self):
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for p in self.pats:
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p.build_tree()
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def prop_format(self):
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for p in self.pats:
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p.build_tree()
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def prop_width(self):
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width = None
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for p in self.pats:
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p.prop_width()
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if width is None:
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width = p.width
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elif width != p.width:
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error_with_file(self.file, self.lineno,
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'width mismatch in patterns within braces')
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self.width = width
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# end MultiPattern
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class IncMultiPattern(MultiPattern):
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"""Class representing an overlapping set of instruction patterns"""
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def __init__(self, lineno, pats, fixb, fixm, udfm, w):
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self.file = input_file
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self.lineno = lineno
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self.pats = pats
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self.base = None
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self.fixedbits = fixb
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self.fixedmask = fixm
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self.undefmask = udfm
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self.width = w
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def output_code(self, i, extracted, outerbits, outermask):
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global translate_prefix
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ind = str_indent(i)
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@ -431,6 +482,153 @@ class IncMultiPattern(MultiPattern):
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#end IncMultiPattern
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class Tree:
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"""Class representing a node in a decode tree"""
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def __init__(self, fm, tm):
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self.fixedmask = fm
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self.thismask = tm
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self.subs = []
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self.base = None
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def str1(self, i):
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ind = str_indent(i)
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r = '{0}{1:08x}'.format(ind, self.fixedmask)
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if self.format:
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r += ' ' + self.format.name
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r += ' [\n'
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for (b, s) in self.subs:
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r += '{0} {1:08x}:\n'.format(ind, b)
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r += s.str1(i + 4) + '\n'
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r += ind + ']'
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return r
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def __str__(self):
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return self.str1(0)
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def output_code(self, i, extracted, outerbits, outermask):
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ind = str_indent(i)
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# If we identified all nodes below have the same format,
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# extract the fields now.
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if not extracted and self.base:
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output(ind, self.base.extract_name(),
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'(ctx, &u.f_', self.base.base.name, ', insn);\n')
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extracted = True
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# Attempt to aid the compiler in producing compact switch statements.
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# If the bits in the mask are contiguous, extract them.
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sh = is_contiguous(self.thismask)
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if sh > 0:
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# Propagate SH down into the local functions.
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def str_switch(b, sh=sh):
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return '(insn >> {0}) & 0x{1:x}'.format(sh, b >> sh)
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def str_case(b, sh=sh):
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return '0x{0:x}'.format(b >> sh)
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else:
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def str_switch(b):
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return 'insn & 0x{0:08x}'.format(b)
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def str_case(b):
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return '0x{0:08x}'.format(b)
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output(ind, 'switch (', str_switch(self.thismask), ') {\n')
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for b, s in sorted(self.subs):
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assert (self.thismask & ~s.fixedmask) == 0
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innermask = outermask | self.thismask
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innerbits = outerbits | b
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output(ind, 'case ', str_case(b), ':\n')
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output(ind, ' /* ',
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str_match_bits(innerbits, innermask), ' */\n')
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s.output_code(i + 4, extracted, innerbits, innermask)
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output(ind, ' return false;\n')
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output(ind, '}\n')
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# end Tree
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class ExcMultiPattern(MultiPattern):
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"""Class representing a non-overlapping set of instruction patterns"""
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def output_code(self, i, extracted, outerbits, outermask):
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# Defer everything to our decomposed Tree node
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self.tree.output_code(i, extracted, outerbits, outermask)
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@staticmethod
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def __build_tree(pats, outerbits, outermask):
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# Find the intersection of all remaining fixedmask.
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innermask = ~outermask & insnmask
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for i in pats:
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innermask &= i.fixedmask
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if innermask == 0:
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# Edge condition: One pattern covers the entire insnmask
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if len(pats) == 1:
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t = Tree(outermask, innermask)
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t.subs.append((0, pats[0]))
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return t
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text = 'overlapping patterns:'
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for p in pats:
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text += '\n' + p.file + ':' + str(p.lineno) + ': ' + str(p)
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error_with_file(pats[0].file, pats[0].lineno, text)
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fullmask = outermask | innermask
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# Sort each element of pats into the bin selected by the mask.
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bins = {}
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for i in pats:
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fb = i.fixedbits & innermask
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if fb in bins:
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bins[fb].append(i)
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else:
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bins[fb] = [i]
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# We must recurse if any bin has more than one element or if
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# the single element in the bin has not been fully matched.
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t = Tree(fullmask, innermask)
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for b, l in bins.items():
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s = l[0]
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if len(l) > 1 or s.fixedmask & ~fullmask != 0:
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s = ExcMultiPattern.__build_tree(l, b | outerbits, fullmask)
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t.subs.append((b, s))
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return t
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def build_tree(self):
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super().prop_format()
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self.tree = self.__build_tree(self.pats, self.fixedbits,
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self.fixedmask)
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@staticmethod
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def __prop_format(tree):
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"""Propagate Format objects into the decode tree"""
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# Depth first search.
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for (b, s) in tree.subs:
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if isinstance(s, Tree):
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ExcMultiPattern.__prop_format(s)
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# If all entries in SUBS have the same format, then
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# propagate that into the tree.
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f = None
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for (b, s) in tree.subs:
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if f is None:
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f = s.base
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if f is None:
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return
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if f is not s.base:
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return
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tree.base = f
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def prop_format(self):
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super().prop_format()
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self.__prop_format(self.tree)
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# end ExcMultiPattern
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def parse_field(lineno, name, toks):
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"""Parse one instruction field from TOKS at LINENO"""
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global fields
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@ -587,18 +785,19 @@ def infer_format(arg, fieldmask, flds, width):
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# end infer_format
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def parse_generic(lineno, is_format, name, toks):
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def parse_generic(lineno, parent_pat, name, toks):
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"""Parse one instruction format from TOKS at LINENO"""
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global fields
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global arguments
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global formats
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global patterns
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global allpatterns
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global re_ident
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global insnwidth
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global insnmask
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global variablewidth
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is_format = parent_pat is None
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fixedmask = 0
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fixedbits = 0
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undefmask = 0
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@ -749,7 +948,7 @@ def parse_generic(lineno, is_format, name, toks):
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error(lineno, 'field {0} not initialized'.format(f))
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pat = Pattern(name, lineno, fmt, fixedbits, fixedmask,
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undefmask, fieldmask, flds, width)
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patterns.append(pat)
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parent_pat.pats.append(pat)
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allpatterns.append(pat)
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# Validate the masks that we have assembled.
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@ -769,61 +968,16 @@ def parse_generic(lineno, is_format, name, toks):
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.format(allbits ^ insnmask))
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# end parse_general
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def build_incmulti_pattern(lineno, pats):
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"""Validate the Patterns going into a IncMultiPattern."""
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global patterns
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global insnmask
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if len(pats) < 2:
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error(lineno, 'less than two patterns within braces')
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fixedmask = insnmask
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undefmask = insnmask
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# Collect fixed/undefmask for all of the children.
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# Move the defining lineno back to that of the first child.
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for p in pats:
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fixedmask &= p.fixedmask
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undefmask &= p.undefmask
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if p.lineno < lineno:
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lineno = p.lineno
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width = None
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for p in pats:
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if width is None:
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width = p.width
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elif width != p.width:
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error(lineno, 'width mismatch in patterns within braces')
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repeat = True
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fixedbits = 0
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while repeat and fixedmask != 0:
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fixedbits = None
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for p in pats:
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thisbits = p.fixedbits & fixedmask
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if fixedbits is None:
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fixedbits = thisbits
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elif fixedbits != thisbits:
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fixedmask &= ~(fixedbits ^ thisbits)
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break
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else:
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repeat = False
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mp = IncMultiPattern(lineno, pats, fixedbits, fixedmask, undefmask, width)
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patterns.append(mp)
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# end build_incmulti_pattern
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def parse_file(f):
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def parse_file(f, parent_pat):
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"""Parse all of the patterns within a file"""
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global patterns
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# Read all of the lines of the file. Concatenate lines
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# ending in backslash; discard empty lines and comments.
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toks = []
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lineno = 0
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nesting = 0
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saved_pats = []
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nesting_pats = []
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for line in f:
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lineno += 1
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@ -868,16 +1022,20 @@ def parse_file(f):
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# End nesting?
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if name == '}':
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if nesting == 0:
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error(start_lineno, 'mismatched close brace')
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if len(toks) != 0:
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error(start_lineno, 'extra tokens after close brace')
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if len(parent_pat.pats) < 2:
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error(lineno, 'less than two patterns within braces')
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try:
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parent_pat = nesting_pats.pop()
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except:
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error(lineno, 'mismatched close brace')
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nesting -= 2
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if indent != nesting:
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error(start_lineno, 'indentation ', indent, ' != ', nesting)
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pats = patterns
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patterns = saved_pats.pop()
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build_incmulti_pattern(lineno, pats)
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error(lineno, 'indentation ', indent, ' != ', nesting)
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toks = []
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continue
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@ -889,8 +1047,12 @@ def parse_file(f):
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if name == '{':
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if len(toks) != 0:
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error(start_lineno, 'extra tokens after open brace')
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saved_pats.append(patterns)
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patterns = []
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nested_pat = IncMultiPattern(start_lineno)
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parent_pat.pats.append(nested_pat)
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nesting_pats.append(parent_pat)
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parent_pat = nested_pat
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nesting += 2
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toks = []
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continue
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@ -901,121 +1063,13 @@ def parse_file(f):
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elif name[0] == '&':
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parse_arguments(start_lineno, name[1:], toks)
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elif name[0] == '@':
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parse_generic(start_lineno, True, name[1:], toks)
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parse_generic(start_lineno, None, name[1:], toks)
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else:
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parse_generic(start_lineno, False, name, toks)
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parse_generic(start_lineno, parent_pat, name, toks)
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toks = []
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# end parse_file
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class Tree:
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"""Class representing a node in a decode tree"""
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def __init__(self, fm, tm):
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self.fixedmask = fm
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self.thismask = tm
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self.subs = []
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self.base = None
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def str1(self, i):
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ind = str_indent(i)
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r = '{0}{1:08x}'.format(ind, self.fixedmask)
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if self.format:
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r += ' ' + self.format.name
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r += ' [\n'
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for (b, s) in self.subs:
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r += '{0} {1:08x}:\n'.format(ind, b)
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r += s.str1(i + 4) + '\n'
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r += ind + ']'
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return r
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def __str__(self):
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return self.str1(0)
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def output_code(self, i, extracted, outerbits, outermask):
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ind = str_indent(i)
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# If we identified all nodes below have the same format,
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# extract the fields now.
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if not extracted and self.base:
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output(ind, self.base.extract_name(),
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'(ctx, &u.f_', self.base.base.name, ', insn);\n')
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extracted = True
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# Attempt to aid the compiler in producing compact switch statements.
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# If the bits in the mask are contiguous, extract them.
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sh = is_contiguous(self.thismask)
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if sh > 0:
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# Propagate SH down into the local functions.
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def str_switch(b, sh=sh):
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return '(insn >> {0}) & 0x{1:x}'.format(sh, b >> sh)
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def str_case(b, sh=sh):
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return '0x{0:x}'.format(b >> sh)
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else:
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def str_switch(b):
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return 'insn & 0x{0:08x}'.format(b)
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def str_case(b):
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return '0x{0:08x}'.format(b)
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output(ind, 'switch (', str_switch(self.thismask), ') {\n')
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for b, s in sorted(self.subs):
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assert (self.thismask & ~s.fixedmask) == 0
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innermask = outermask | self.thismask
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innerbits = outerbits | b
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output(ind, 'case ', str_case(b), ':\n')
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output(ind, ' /* ',
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str_match_bits(innerbits, innermask), ' */\n')
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s.output_code(i + 4, extracted, innerbits, innermask)
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output(ind, ' return false;\n')
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output(ind, '}\n')
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# end Tree
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def build_tree(pats, outerbits, outermask):
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# Find the intersection of all remaining fixedmask.
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innermask = ~outermask & insnmask
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for i in pats:
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innermask &= i.fixedmask
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if innermask == 0:
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# Edge condition: One pattern covers the entire insnmask
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if len(pats) == 1:
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t = Tree(outermask, innermask)
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t.subs.append((0, pats[0]))
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||||
return t
|
||||
|
||||
text = 'overlapping patterns:'
|
||||
for p in pats:
|
||||
text += '\n' + p.file + ':' + str(p.lineno) + ': ' + str(p)
|
||||
error_with_file(pats[0].file, pats[0].lineno, text)
|
||||
|
||||
fullmask = outermask | innermask
|
||||
|
||||
# Sort each element of pats into the bin selected by the mask.
|
||||
bins = {}
|
||||
for i in pats:
|
||||
fb = i.fixedbits & innermask
|
||||
if fb in bins:
|
||||
bins[fb].append(i)
|
||||
else:
|
||||
bins[fb] = [i]
|
||||
|
||||
# We must recurse if any bin has more than one element or if
|
||||
# the single element in the bin has not been fully matched.
|
||||
t = Tree(fullmask, innermask)
|
||||
|
||||
for b, l in bins.items():
|
||||
s = l[0]
|
||||
if len(l) > 1 or s.fixedmask & ~fullmask != 0:
|
||||
s = build_tree(l, b | outerbits, fullmask)
|
||||
t.subs.append((b, s))
|
||||
|
||||
return t
|
||||
# end build_tree
|
||||
|
||||
|
||||
class SizeTree:
|
||||
"""Class representing a node in a size decode tree"""
|
||||
|
||||
@ -1157,28 +1211,6 @@ def build_size_tree(pats, width, outerbits, outermask):
|
||||
# end build_size_tree
|
||||
|
||||
|
||||
def prop_format(tree):
|
||||
"""Propagate Format objects into the decode tree"""
|
||||
|
||||
# Depth first search.
|
||||
for (b, s) in tree.subs:
|
||||
if isinstance(s, Tree):
|
||||
prop_format(s)
|
||||
|
||||
# If all entries in SUBS have the same format, then
|
||||
# propagate that into the tree.
|
||||
f = None
|
||||
for (b, s) in tree.subs:
|
||||
if f is None:
|
||||
f = s.base
|
||||
if f is None:
|
||||
return
|
||||
if f is not s.base:
|
||||
return
|
||||
tree.base = f
|
||||
# end prop_format
|
||||
|
||||
|
||||
def prop_size(tree):
|
||||
"""Propagate minimum widths up the decode size tree"""
|
||||
|
||||
@ -1199,7 +1231,6 @@ def prop_size(tree):
|
||||
def main():
|
||||
global arguments
|
||||
global formats
|
||||
global patterns
|
||||
global allpatterns
|
||||
global translate_scope
|
||||
global translate_prefix
|
||||
@ -1246,18 +1277,29 @@ def main():
|
||||
|
||||
if len(args) < 1:
|
||||
error(0, 'missing input file')
|
||||
|
||||
toppat = ExcMultiPattern(0)
|
||||
|
||||
for filename in args:
|
||||
input_file = filename
|
||||
f = open(filename, 'r')
|
||||
parse_file(f)
|
||||
parse_file(f, toppat)
|
||||
f.close()
|
||||
|
||||
if variablewidth:
|
||||
stree = build_size_tree(patterns, 8, 0, 0)
|
||||
prop_size(stree)
|
||||
# We do not want to compute masks for toppat, because those masks
|
||||
# are used as a starting point for build_tree. For toppat, we must
|
||||
# insist that decode begins from naught.
|
||||
for i in toppat.pats:
|
||||
i.prop_masks()
|
||||
|
||||
dtree = build_tree(patterns, 0, 0)
|
||||
prop_format(dtree)
|
||||
toppat.build_tree()
|
||||
toppat.prop_format()
|
||||
|
||||
if variablewidth:
|
||||
for i in toppat.pats:
|
||||
i.prop_width()
|
||||
stree = build_size_tree(toppat.pats, 8, 0, 0)
|
||||
prop_size(stree)
|
||||
|
||||
if output_file:
|
||||
output_fd = open(output_file, 'w')
|
||||
@ -1316,7 +1358,7 @@ def main():
|
||||
f = arguments[n]
|
||||
output(i4, i4, f.struct_name(), ' f_', f.name, ';\n')
|
||||
output(i4, '} u;\n\n')
|
||||
dtree.output_code(4, False, 0, 0)
|
||||
toppat.output_code(4, False, 0, 0)
|
||||
|
||||
output(i4, 'return false;\n')
|
||||
output('}\n')
|
||||
|
||||
Loading…
Reference in New Issue
Block a user