Python 3 compat.

Try to keep our Python sources compatible with both Python 2.7 and 3.

Check with 'pylint --py3k' and 'python -3'.

meta/build.py

@@ -2,6 +2,7 @@
 #
 # This script is run from src/libcretonne/build.rs to generate Rust files.
 
+from __future__ import absolute_import
 import argparse
 import isa
 import gen_instr

meta/constant_hash.py

@@ -5,6 +5,7 @@ The `constant_hash` module can generate constant pre-populated hash tables. We
 don't attempt parfect hashing, but simply generate an open addressed
 quadratically probed hash table.
 """
+from __future__ import absolute_import
 
 
 def simple_hash(s):

meta/cretonne/__init__.py

@@ -4,7 +4,7 @@ Cretonne meta language module.
 This module provides classes and functions used to describe Cretonne
 instructions.
 """
-
+from __future__ import absolute_import
 import re
 import importlib
 from collections import namedtuple
@@ -156,7 +156,7 @@ class SettingGroup(object):
                 .format(self, SettingGroup._current))
         SettingGroup._current = None
         if globs:
-            from predicates import Predicate
+            from .predicates import Predicate
             for name, obj in globs.iteritems():
                 if isinstance(obj, Setting):
                     assert obj.name is None, obj.name
@@ -365,7 +365,7 @@ class IntType(ScalarType):
         assert bits > 0, 'IntType must have positive number of bits'
         super(IntType, self).__init__(
                 name='i{:d}'.format(bits),
-                membytes=bits/8,
+                membytes=bits // 8,
                 doc="An integer type with {} bits.".format(bits))
         self.bits = bits
 
@@ -379,7 +379,7 @@ class FloatType(ScalarType):
     def __init__(self, bits, doc):
         assert bits > 0, 'FloatType must have positive number of bits'
         super(FloatType, self).__init__(name='f{:d}'.format(bits),
-                                        membytes=bits/8, doc=doc)
+                                        membytes=bits // 8, doc=doc)
         self.bits = bits
 
     def __repr__(self):
@@ -393,7 +393,7 @@ class BoolType(ScalarType):
         assert bits > 0, 'BoolType must have positive number of bits'
         super(BoolType, self).__init__(
                 name='b{:d}'.format(bits),
-                membytes=bits/8,
+                membytes=bits // 8,
                 doc="A boolean type with {} bits.".format(bits))
         self.bits = bits
 
@@ -845,7 +845,7 @@ class BoundInstruction(object):
         assert len(typevars) <= 1 + len(inst.other_typevars)
 
     def __str__(self):
-        return '.'.join([self.inst.name, ] + map(str, self.typevars))
+        return '.'.join([self.inst.name, ] + list(map(str, self.typevars)))
 
     def bind(self, *args):
         """

meta/cretonne/base.py

@@ -4,10 +4,11 @@ Cretonne base instruction set.
 This module defines the basic Cretonne instruction set that all targets
 support.
 """
+from __future__ import absolute_import
 from . import TypeVar, Operand, Instruction, InstructionGroup, variable_args
-from types import i8, f32, f64
-from immediates import imm64, uimm8, ieee32, ieee64, immvector, intcc, floatcc
-import entities
+from .types import i8, f32, f64
+from .immediates import imm64, uimm8, ieee32, ieee64, immvector, intcc, floatcc
+from . import entities
 
 instructions = InstructionGroup("base", "Shared base instruction set")
 

meta/cretonne/entities.py

@@ -3,7 +3,7 @@ The `cretonne.entities` module predefines all the Cretonne entity reference
 operand types. Thee are corresponding definitions in the `cretonne.entities`
 Rust module.
 """
-
+from __future__ import absolute_import
 from . import EntityRefKind
 
 

meta/cretonne/formats.py

@@ -5,11 +5,10 @@ Every instruction format has a corresponding `InstructionData` variant in the
 Rust representation of cretonne IL, so all instruction formats must be defined
 in this module.
 """
-
-
+from __future__ import absolute_import
 from . import InstructionFormat, value, variable_args
-from immediates import imm64, uimm8, ieee32, ieee64, immvector, intcc, floatcc
-from entities import ebb, function, jump_table
+from .immediates import imm64, uimm8, ieee32, ieee64, immvector, intcc, floatcc
+from .entities import ebb, function, jump_table
 
 Nullary = InstructionFormat()
 

meta/cretonne/immediates.py

@@ -2,7 +2,7 @@
 The `cretonne.immediates` module predefines all the Cretonne immediate operand
 types.
 """
-
+from __future__ import absolute_import
 from . import ImmediateKind
 
 #: A 64-bit immediate integer operand.

meta/cretonne/predicates.py

@@ -21,6 +21,8 @@ All predicates have a *context* which determines where they can be evaluated.
 For an ISA predicate, the context is the ISA settings group. For an instruction
 predicate, the context is the instruction format.
 """
+from __future__ import absolute_import
+from functools import reduce
 
 
 def _is_parent(a, b):

meta/cretonne/settings.py

@@ -3,7 +3,7 @@ Cretonne shared settings.
 
 This module defines settings are are relevant for all code generators.
 """
-
+from __future__ import absolute_import
 from . import SettingGroup, BoolSetting, EnumSetting
 
 group = SettingGroup('shared')

meta/cretonne/types.py

@@ -1,7 +1,7 @@
 """
 The cretonne.types module predefines all the Cretonne scalar types.
 """
-
+from __future__ import absolute_import
 from . import ScalarType, IntType, FloatType, BoolType
 
 #: Boolean.

meta/gen_build_deps.py

@@ -12,7 +12,7 @@ If the build script outputs lines of the form:
 cargo will rerun the build script when those files have changed since the last
 build.
 """
-
+from __future__ import absolute_import, print_function
 import os
 from os.path import dirname, abspath, join
 
@@ -30,7 +30,7 @@ def source_files(top):
 
 
 def generate():
-    print "Dependencies from meta language directory:"
+    print("Dependencies from meta language directory:")
     meta = dirname(abspath(__file__))
     for path in source_files(meta):
-        print "cargo:rerun-if-changed=" + path
+        print("cargo:rerun-if-changed=" + path)

meta/gen_instr.py

@@ -1,7 +1,7 @@
 """
 Generate sources with instruction info.
 """
-
+from __future__ import absolute_import
 import srcgen
 import constant_hash
 from unique_table import UniqueTable, UniqueSeqTable

meta/gen_settings.py

@@ -1,7 +1,7 @@
 """
 Generate sources with settings.
 """
-
+from __future__ import absolute_import
 import srcgen
 from unique_table import UniqueSeqTable
 import constant_hash
@@ -102,7 +102,7 @@ def gen_pred_getter(pred, fmt):
     """
     Emit a getter for a pre-computed predicate.
     """
-    fmt.doc_comment('Computed predicate `{}`.'.format(pred.rust_predicate(0)));
+    fmt.doc_comment('Computed predicate `{}`.'.format(pred.rust_predicate(0)))
     proto = 'pub fn {}(&self) -> bool'.format(pred.name)
     with fmt.indented(proto + ' {', '}'):
         fmt.line('(self.bytes[{}] & (1 << {})) != 0'.format(

meta/isa/__init__.py

@@ -5,7 +5,7 @@ Cretonne target ISA definitions
 The :py:mod:`isa` package contains sub-packages for each target instruction set
 architecture supported by Cretonne.
 """
-
+from __future__ import absolute_import
 from . import riscv
 
 

meta/isa/riscv/__init__.py

@@ -24,10 +24,10 @@ RV32G / RV64G
     F, and D instruction sets listed above.
 
 """
-
-import defs
-import encodings
-import settings
+from __future__ import absolute_import
+from . import defs
+from . import encodings
+from . import settings
 
 # Re-export the primary target ISA definition.
 isa = defs.isa

meta/isa/riscv/defs.py

@@ -3,7 +3,7 @@ RISC-V definitions.
 
 Commonly used definitions.
 """
-
+from __future__ import absolute_import
 from cretonne import TargetISA, CPUMode
 import cretonne.base
 

meta/isa/riscv/encodings.py

@@ -1,9 +1,10 @@
 """
 RISC-V Encodings.
 """
+from __future__ import absolute_import
 from cretonne import base
-from defs import RV32, RV64
-from recipes import OPIMM, OPIMM32, OP, OP32, R, Rshamt
+from .defs import RV32, RV64
+from .recipes import OPIMM, OPIMM32, OP, OP32, R, Rshamt
 
 # Basic arithmetic binary instructions are encoded in an R-type instruction.
 for inst,           f3,    f7 in [

meta/isa/riscv/recipes.py

@@ -8,6 +8,7 @@ instruction formats described in the reference:
     Volume I: User-Level ISA
     Version 2.1
 """
+from __future__ import absolute_import
 from cretonne import EncRecipe
 from cretonne.formats import Binary, BinaryImm
 

meta/isa/riscv/settings.py

@@ -1,11 +1,11 @@
 """
 RISC-V settings.
 """
-
+from __future__ import absolute_import
 from cretonne import SettingGroup, BoolSetting
 from cretonne.predicates import And
 import cretonne.settings as shared
-from defs import isa
+from .defs import isa
 
 isa.settings = SettingGroup('riscv', parent=shared.group)
 

meta/srcgen.py

@@ -5,7 +5,7 @@ The `srcgen` module contains generic helper routines and classes for generating
 source code.
 
 """
-
+from __future__ import absolute_import
 import sys
 import os
 import re