mirror of
https://github.com/python/cpython.git
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694 lines
21 KiB
Python
Executable File
694 lines
21 KiB
Python
Executable File
#! /usr/bin/env python
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"""Generate C code from an ASDL description."""
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# TO DO
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# handle fields that have a type but no name
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import os, sys, traceback
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import asdl
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TABSIZE = 8
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MAX_COL = 80
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def get_c_type(name):
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"""Return a string for the C name of the type.
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This function special cases the default types provided by asdl:
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identifier, string, int, bool.
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"""
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# XXX ack! need to figure out where Id is useful and where string
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if isinstance(name, asdl.Id):
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name = name.value
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if name in asdl.builtin_types:
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return name
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else:
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return "%s_ty" % name
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def reflow_lines(s, depth):
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"""Reflow the line s indented depth tabs.
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Return a sequence of lines where no line extends beyond MAX_COL
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when properly indented. The first line is properly indented based
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exclusively on depth * TABSIZE. All following lines -- these are
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the reflowed lines generated by this function -- start at the same
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column as the first character beyond the opening { in the first
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line.
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"""
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size = MAX_COL - depth * TABSIZE
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if len(s) < size:
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return [s]
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lines = []
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cur = s
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padding = ""
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while len(cur) > size:
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i = cur.rfind(' ', 0, size)
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# XXX this should be fixed for real
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if i == -1 and 'GeneratorExp' in cur:
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i = size + 3
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assert i != -1, "Impossible line %d to reflow: %s" % (size, `s`)
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lines.append(padding + cur[:i])
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if len(lines) == 1:
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# find new size based on brace
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j = cur.find('{', 0, i)
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if j >= 0:
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j += 2 # account for the brace and the space after it
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size -= j
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padding = " " * j
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else:
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j = cur.find('(', 0, i)
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if j >= 0:
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j += 1 # account for the paren (no space after it)
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size -= j
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padding = " " * j
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cur = cur[i+1:]
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else:
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lines.append(padding + cur)
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return lines
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def is_simple(sum):
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"""Return True if a sum is a simple.
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A sum is simple if its types have no fields, e.g.
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unaryop = Invert | Not | UAdd | USub
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"""
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for t in sum.types:
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if t.fields:
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return False
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return True
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class EmitVisitor(asdl.VisitorBase):
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"""Visit that emits lines"""
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def __init__(self, file):
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self.file = file
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super(EmitVisitor, self).__init__()
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def emit(self, s, depth, reflow=1):
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# XXX reflow long lines?
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if reflow:
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lines = reflow_lines(s, depth)
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else:
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lines = [s]
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for line in lines:
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line = (" " * TABSIZE * depth) + line + "\n"
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self.file.write(line)
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class TypeDefVisitor(EmitVisitor):
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def visitModule(self, mod):
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for dfn in mod.dfns:
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self.visit(dfn)
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def visitType(self, type, depth=0):
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self.visit(type.value, type.name, depth)
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def visitSum(self, sum, name, depth):
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if is_simple(sum):
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self.simple_sum(sum, name, depth)
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else:
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self.sum_with_constructors(sum, name, depth)
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def simple_sum(self, sum, name, depth):
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enum = []
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for i in range(len(sum.types)):
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type = sum.types[i]
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enum.append("%s=%d" % (type.name, i + 1))
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enums = ", ".join(enum)
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ctype = get_c_type(name)
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s = "typedef enum _%s { %s } %s;" % (name, enums, ctype)
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self.emit(s, depth)
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self.emit("", depth)
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def sum_with_constructors(self, sum, name, depth):
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ctype = get_c_type(name)
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s = "typedef struct _%(name)s *%(ctype)s;" % locals()
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self.emit(s, depth)
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self.emit("", depth)
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def visitProduct(self, product, name, depth):
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ctype = get_c_type(name)
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s = "typedef struct _%(name)s *%(ctype)s;" % locals()
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self.emit(s, depth)
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self.emit("", depth)
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class StructVisitor(EmitVisitor):
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"""Visitor to generate typdefs for AST."""
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def visitModule(self, mod):
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for dfn in mod.dfns:
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self.visit(dfn)
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def visitType(self, type, depth=0):
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self.visit(type.value, type.name, depth)
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def visitSum(self, sum, name, depth):
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if not is_simple(sum):
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self.sum_with_constructors(sum, name, depth)
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def sum_with_constructors(self, sum, name, depth):
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def emit(s, depth=depth):
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self.emit(s % sys._getframe(1).f_locals, depth)
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enum = []
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for i in range(len(sum.types)):
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type = sum.types[i]
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enum.append("%s_kind=%d" % (type.name, i + 1))
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emit("struct _%(name)s {")
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emit("enum { " + ", ".join(enum) + " } kind;", depth + 1)
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emit("union {", depth + 1)
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for t in sum.types:
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self.visit(t, depth + 2)
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emit("} v;", depth + 1)
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for field in sum.attributes:
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# rudimentary attribute handling
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type = str(field.type)
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assert type in asdl.builtin_types, type
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emit("%s %s;" % (type, field.name), depth + 1);
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emit("};")
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emit("")
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def visitConstructor(self, cons, depth):
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if cons.fields:
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self.emit("struct {", depth)
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for f in cons.fields:
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self.visit(f, depth + 1)
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self.emit("} %s;" % cons.name, depth)
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self.emit("", depth)
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else:
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# XXX not sure what I want here, nothing is probably fine
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pass
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def visitField(self, field, depth):
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# XXX need to lookup field.type, because it might be something
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# like a builtin...
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ctype = get_c_type(field.type)
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name = field.name
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if field.seq:
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self.emit("asdl_seq *%(name)s;" % locals(), depth)
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else:
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self.emit("%(ctype)s %(name)s;" % locals(), depth)
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def visitProduct(self, product, name, depth):
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self.emit("struct _%(name)s {" % locals(), depth)
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for f in product.fields:
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self.visit(f, depth + 1)
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self.emit("};", depth)
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self.emit("", depth)
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class PrototypeVisitor(EmitVisitor):
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"""Generate function prototypes for the .h file"""
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def visitModule(self, mod):
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for dfn in mod.dfns:
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self.visit(dfn)
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def visitType(self, type):
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self.visit(type.value, type.name)
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def visitSum(self, sum, name):
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if is_simple(sum):
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pass # XXX
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else:
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for t in sum.types:
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self.visit(t, name, sum.attributes)
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def get_args(self, fields):
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"""Return list of C argument into, one for each field.
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Argument info is 3-tuple of a C type, variable name, and flag
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that is true if type can be NULL.
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"""
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args = []
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unnamed = {}
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for f in fields:
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if f.name is None:
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name = f.type
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c = unnamed[name] = unnamed.get(name, 0) + 1
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if c > 1:
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name = "name%d" % (c - 1)
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else:
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name = f.name
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# XXX should extend get_c_type() to handle this
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if f.seq:
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ctype = "asdl_seq *"
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else:
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ctype = get_c_type(f.type)
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args.append((ctype, name, f.opt or f.seq))
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return args
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def visitConstructor(self, cons, type, attrs):
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args = self.get_args(cons.fields)
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attrs = self.get_args(attrs)
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ctype = get_c_type(type)
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self.emit_function(cons.name, ctype, args, attrs)
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def emit_function(self, name, ctype, args, attrs, union=1):
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args = args + attrs
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if args:
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argstr = ", ".join(["%s %s" % (atype, aname)
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for atype, aname, opt in args])
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else:
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argstr = "void"
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self.emit("%s %s(%s);" % (ctype, name, argstr), 0)
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def visitProduct(self, prod, name):
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self.emit_function(name, get_c_type(name),
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self.get_args(prod.fields), [], union=0)
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class FunctionVisitor(PrototypeVisitor):
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"""Visitor to generate constructor functions for AST."""
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def emit_function(self, name, ctype, args, attrs, union=1):
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def emit(s, depth=0, reflow=1):
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self.emit(s, depth, reflow)
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argstr = ", ".join(["%s %s" % (atype, aname)
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for atype, aname, opt in args + attrs])
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self.emit("%s" % ctype, 0)
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emit("%s(%s)" % (name, argstr))
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emit("{")
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emit("%s p;" % ctype, 1)
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for argtype, argname, opt in args:
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# XXX hack alert: false is allowed for a bool
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if not opt and not argtype == "bool":
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emit("if (!%s) {" % argname, 1)
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emit("PyErr_SetString(PyExc_ValueError,", 2)
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msg = "field %s is required for %s" % (argname, name)
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emit(' "%s");' % msg,
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2, reflow=0)
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emit('return NULL;', 2)
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emit('}', 1)
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emit("p = (%s)malloc(sizeof(*p));" % ctype, 1)
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emit("if (!p) {", 1)
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emit("PyErr_NoMemory();", 2)
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emit("return NULL;", 2)
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emit("}", 1)
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if union:
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self.emit_body_union(name, args, attrs)
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else:
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self.emit_body_struct(name, args, attrs)
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emit("return p;", 1)
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emit("}")
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emit("")
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def emit_body_union(self, name, args, attrs):
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def emit(s, depth=0, reflow=1):
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self.emit(s, depth, reflow)
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emit("p->kind = %s_kind;" % name, 1)
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for argtype, argname, opt in args:
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emit("p->v.%s.%s = %s;" % (name, argname, argname), 1)
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for argtype, argname, opt in attrs:
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emit("p->%s = %s;" % (argname, argname), 1)
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def emit_body_struct(self, name, args, attrs):
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def emit(s, depth=0, reflow=1):
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self.emit(s, depth, reflow)
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for argtype, argname, opt in args:
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emit("p->%s = %s;" % (argname, argname), 1)
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assert not attrs
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class PickleVisitor(EmitVisitor):
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def visitModule(self, mod):
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for dfn in mod.dfns:
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self.visit(dfn)
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def visitType(self, type):
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self.visit(type.value, type.name)
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def visitSum(self, sum, name):
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pass
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def visitProduct(self, sum, name):
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pass
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def visitConstructor(self, cons, name):
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pass
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def visitField(self, sum):
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pass
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class MarshalPrototypeVisitor(PickleVisitor):
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def prototype(self, sum, name):
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ctype = get_c_type(name)
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self.emit("static int marshal_write_%s(PyObject **, int *, %s);"
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% (name, ctype), 0)
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visitProduct = visitSum = prototype
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class FreePrototypeVisitor(PickleVisitor):
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def prototype(self, sum, name):
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ctype = get_c_type(name)
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self.emit("void free_%s(%s);" % (name, ctype), 0)
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visitProduct = visitSum = prototype
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_SPECIALIZED_SEQUENCES = ('stmt', 'expr')
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def find_sequence(fields, doing_specialization):
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"""Return True if any field uses a sequence."""
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for f in fields:
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if f.seq:
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if not doing_specialization:
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return True
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if str(f.type) not in _SPECIALIZED_SEQUENCES:
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return True
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return False
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def has_sequence(types, doing_specialization):
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for t in types:
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if find_sequence(t.fields, doing_specialization):
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return True
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return False
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class StaticVisitor(PickleVisitor):
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CODE = '''Very simple, always emit this static code. Overide CODE'''
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def visit(self, object):
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self.emit(self.CODE, 0, reflow=False)
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class FreeUtilVisitor(StaticVisitor):
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CODE = '''static void
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free_seq_exprs(asdl_seq *seq)
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{
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int i, n;
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n = asdl_seq_LEN(seq);
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for (i = 0; i < n; i++)
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free_expr((expr_ty)asdl_seq_GET(seq, i));
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asdl_seq_free(seq);
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}
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static void
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free_seq_stmts(asdl_seq *seq)
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{
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int i, n;
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n = asdl_seq_LEN(seq);
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for (i = 0; i < n; i++)
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free_stmt((stmt_ty)asdl_seq_GET(seq, i));
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asdl_seq_free(seq);
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}
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'''
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class FreeVisitor(PickleVisitor):
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def func_begin(self, name, has_seq):
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ctype = get_c_type(name)
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self.emit("void", 0)
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self.emit("free_%s(%s o)" % (name, ctype), 0)
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self.emit("{", 0)
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if has_seq:
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self.emit("int i, n;", 1)
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self.emit("asdl_seq *seq;", 1)
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self.emit('', 0)
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self.emit('if (!o)', 1)
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self.emit('return;', 2)
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self.emit('', 0)
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def func_end(self):
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self.emit("}", 0)
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self.emit("", 0)
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def visitSum(self, sum, name):
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has_seq = has_sequence(sum.types, True)
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self.func_begin(name, has_seq)
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if not is_simple(sum):
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self.emit("switch (o->kind) {", 1)
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for i in range(len(sum.types)):
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t = sum.types[i]
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self.visitConstructor(t, i + 1, name)
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self.emit("}", 1)
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self.emit("", 0)
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self.emit("free(o);", 1)
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self.func_end()
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def visitProduct(self, prod, name):
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self.func_begin(name, find_sequence(prod.fields, True))
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for field in prod.fields:
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self.visitField(field, name, 1, True)
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self.emit("", 0)
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self.emit("free(o);", 1)
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self.func_end()
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def visitConstructor(self, cons, enum, name):
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self.emit("case %s_kind:" % cons.name, 1)
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for f in cons.fields:
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self.visitField(f, cons.name, 2, False)
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self.emit("break;", 2)
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def visitField(self, field, name, depth, product):
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def emit(s, d):
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self.emit(s, depth + d)
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if product:
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value = "o->%s" % field.name
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else:
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value = "o->v.%s.%s" % (name, field.name)
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if field.seq:
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self.emitSeq(field, value, depth, emit)
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# XXX need to know the simple types in advance, so that we
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# don't call free_TYPE() for them.
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elif field.opt:
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emit("if (%s) {" % value, 0)
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self.free(field, value, depth + 1)
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emit("}", 0)
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else:
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self.free(field, value, depth)
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def emitSeq(self, field, value, depth, emit):
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# specialize for freeing sequences of statements and expressions
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if str(field.type) in _SPECIALIZED_SEQUENCES:
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c_code = "free_seq_%ss(%s);" % (field.type, value)
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emit(c_code, 0)
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else:
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emit("seq = %s;" % value, 0)
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emit("n = asdl_seq_LEN(seq);", 0)
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emit("for (i = 0; i < n; i++)", 0)
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self.free(field, "asdl_seq_GET(seq, i)", depth + 1)
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emit("asdl_seq_free(seq);", 0)
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def free(self, field, value, depth):
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if str(field.type) in ("identifier", "string", "object"):
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ctype = get_c_type(field.type)
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self.emit("Py_DECREF((%s)%s);" % (ctype, value), depth)
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elif str(field.type) == "bool":
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return
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else:
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ctype = get_c_type(field.type)
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self.emit("free_%s((%s)%s);" % (field.type, ctype, value), depth)
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class MarshalUtilVisitor(StaticVisitor):
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CODE = '''
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#define CHECKSIZE(BUF, OFF, MIN) { \\
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int need = *(OFF) + MIN; \\
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if (need >= PyString_GET_SIZE(*(BUF))) { \\
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int newsize = PyString_GET_SIZE(*(BUF)) * 2; \\
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if (newsize < need) \\
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newsize = need; \\
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if (_PyString_Resize((BUF), newsize) < 0) \\
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return 0; \\
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} \\
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}
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static int
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marshal_write_int(PyObject **buf, int *offset, int x)
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{
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char *s;
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CHECKSIZE(buf, offset, 4)
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s = PyString_AS_STRING(*buf) + (*offset);
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s[0] = (x & 0xff);
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s[1] = (x >> 8) & 0xff;
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s[2] = (x >> 16) & 0xff;
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s[3] = (x >> 24) & 0xff;
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*offset += 4;
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return 1;
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}
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static int
|
|
marshal_write_bool(PyObject **buf, int *offset, bool b)
|
|
{
|
|
if (b)
|
|
marshal_write_int(buf, offset, 1);
|
|
else
|
|
marshal_write_int(buf, offset, 0);
|
|
return 1;
|
|
}
|
|
|
|
static int
|
|
marshal_write_identifier(PyObject **buf, int *offset, identifier id)
|
|
{
|
|
int l = PyString_GET_SIZE(id);
|
|
marshal_write_int(buf, offset, l);
|
|
CHECKSIZE(buf, offset, l);
|
|
memcpy(PyString_AS_STRING(*buf) + *offset,
|
|
PyString_AS_STRING(id), l);
|
|
*offset += l;
|
|
return 1;
|
|
}
|
|
|
|
static int
|
|
marshal_write_string(PyObject **buf, int *offset, string s)
|
|
{
|
|
int len = PyString_GET_SIZE(s);
|
|
marshal_write_int(buf, offset, len);
|
|
CHECKSIZE(buf, offset, len);
|
|
memcpy(PyString_AS_STRING(*buf) + *offset,
|
|
PyString_AS_STRING(s), len);
|
|
*offset += len;
|
|
return 1;
|
|
}
|
|
|
|
static int
|
|
marshal_write_object(PyObject **buf, int *offset, object s)
|
|
{
|
|
/* XXX */
|
|
return 0;
|
|
}
|
|
'''
|
|
|
|
class MarshalFunctionVisitor(PickleVisitor):
|
|
|
|
def func_begin(self, name, has_seq):
|
|
ctype = get_c_type(name)
|
|
self.emit("static int", 0)
|
|
self.emit("marshal_write_%s(PyObject **buf, int *off, %s o)" %
|
|
(name, ctype), 0)
|
|
self.emit("{", 0)
|
|
if has_seq:
|
|
self.emit("int i;", 1)
|
|
|
|
def func_end(self):
|
|
self.emit("return 1;", 1)
|
|
self.emit("}", 0)
|
|
self.emit("", 0)
|
|
|
|
def visitSum(self, sum, name):
|
|
self.func_begin(name, has_sequence(sum.types, False))
|
|
simple = is_simple(sum)
|
|
if simple:
|
|
self.emit("switch (o) {", 1)
|
|
else:
|
|
self.emit("switch (o->kind) {", 1)
|
|
for i in range(len(sum.types)):
|
|
t = sum.types[i]
|
|
self.visitConstructor(t, i + 1, name, simple)
|
|
self.emit("}", 1)
|
|
self.func_end()
|
|
|
|
def visitProduct(self, prod, name):
|
|
self.func_begin(name, find_sequence(prod.fields, False))
|
|
for field in prod.fields:
|
|
self.visitField(field, name, 1, 1)
|
|
self.func_end()
|
|
|
|
def visitConstructor(self, cons, enum, name, simple):
|
|
if simple:
|
|
self.emit("case %s:" % cons.name, 1)
|
|
self.emit("marshal_write_int(buf, off, %d);" % enum, 2);
|
|
self.emit("break;", 2)
|
|
else:
|
|
self.emit("case %s_kind:" % cons.name, 1)
|
|
self.emit("marshal_write_int(buf, off, %d);" % enum, 2)
|
|
for f in cons.fields:
|
|
self.visitField(f, cons.name, 2, 0)
|
|
self.emit("break;", 2)
|
|
|
|
def visitField(self, field, name, depth, product):
|
|
def emit(s, d):
|
|
self.emit(s, depth + d)
|
|
if product:
|
|
value = "o->%s" % field.name
|
|
else:
|
|
value = "o->v.%s.%s" % (name, field.name)
|
|
if field.seq:
|
|
emit("marshal_write_int(buf, off, asdl_seq_LEN(%s));" % value, 0)
|
|
emit("for (i = 0; i < asdl_seq_LEN(%s); i++) {" % value, 0)
|
|
emit("void *elt = asdl_seq_GET(%s, i);" % value, 1);
|
|
ctype = get_c_type(field.type);
|
|
emit("marshal_write_%s(buf, off, (%s)elt);" % (field.type,
|
|
ctype), 1)
|
|
emit("}", 0)
|
|
elif field.opt:
|
|
emit("if (%s) {" % value, 0)
|
|
emit("marshal_write_int(buf, off, 1);", 1)
|
|
emit("marshal_write_%s(buf, off, %s);" % (field.type, value), 1)
|
|
emit("}", 0)
|
|
emit("else {", 0)
|
|
emit("marshal_write_int(buf, off, 0);", 1)
|
|
emit("}", 0)
|
|
else:
|
|
emit("marshal_write_%s(buf, off, %s);" % (field.type, value), 0)
|
|
|
|
class ChainOfVisitors:
|
|
def __init__(self, *visitors):
|
|
self.visitors = visitors
|
|
|
|
def visit(self, object):
|
|
for v in self.visitors:
|
|
v.visit(object)
|
|
v.emit("", 0)
|
|
|
|
def main(srcfile):
|
|
auto_gen_msg = '/* File automatically generated by %s */\n' % sys.argv[0]
|
|
mod = asdl.parse(srcfile)
|
|
if not asdl.check(mod):
|
|
sys.exit(1)
|
|
if INC_DIR:
|
|
p = "%s/%s-ast.h" % (INC_DIR, mod.name)
|
|
else:
|
|
p = "%s-ast.h" % mod.name
|
|
f = open(p, "wb")
|
|
print >> f, auto_gen_msg
|
|
print >> f, '#include "asdl.h"\n'
|
|
c = ChainOfVisitors(TypeDefVisitor(f),
|
|
StructVisitor(f),
|
|
PrototypeVisitor(f),
|
|
FreePrototypeVisitor(f),
|
|
)
|
|
c.visit(mod)
|
|
f.close()
|
|
|
|
if SRC_DIR:
|
|
p = "%s/%s-ast.c" % (SRC_DIR, mod.name)
|
|
else:
|
|
p = "%s-ast.c" % mod.name
|
|
f = open(p, "wb")
|
|
print >> f, auto_gen_msg
|
|
print >> f, '#include "Python.h"'
|
|
print >> f, '#include "%s-ast.h"' % mod.name
|
|
print >> f
|
|
v = ChainOfVisitors(MarshalPrototypeVisitor(f),
|
|
FunctionVisitor(f),
|
|
FreeUtilVisitor(f),
|
|
FreeVisitor(f),
|
|
MarshalUtilVisitor(f),
|
|
MarshalFunctionVisitor(f),
|
|
)
|
|
v.visit(mod)
|
|
f.close()
|
|
|
|
if __name__ == "__main__":
|
|
import sys
|
|
import getopt
|
|
|
|
INC_DIR = ''
|
|
SRC_DIR = ''
|
|
opts, args = getopt.getopt(sys.argv[1:], "h:c:")
|
|
for o, v in opts:
|
|
if o == '-h':
|
|
INC_DIR = v
|
|
if o == '-c':
|
|
SRC_DIR = v
|
|
if len(args) != 1:
|
|
print "Must specify single input file"
|
|
main(args[0])
|