Move formats, entities, and immediates to the base package.

- base.formats defines instruction formats.
- base.entities defines kinds of entity references.
- base.immediates defines kinds of imediate operands.

lib/cretonne/meta/base/formats.py

@@ -7,7 +7,7 @@ in this module.
 """
 from __future__ import absolute_import
 from cdsl.operands import VALUE, VARIABLE_ARGS
-from . import InstructionFormat
+from cretonne import InstructionFormat
 from .immediates import imm64, uimm8, ieee32, ieee64, immvector, intcc, floatcc
 from .entities import ebb, sig_ref, func_ref, jump_table
 

lib/cretonne/meta/cretonne/__init__.py

@@ -732,4 +732,4 @@ class Encoding(object):
 
 # Import the fixed instruction formats now so they can be added to the
 # registry.
-importlib.import_module('cretonne.formats')
+importlib.import_module('base.formats')

lib/cretonne/meta/cretonne/base.py

@@ -9,8 +9,9 @@ from cdsl.operands import VARIABLE_ARGS
 from . import Operand, Instruction, InstructionGroup
 from .typevar import TypeVar
 from base.types import i8, f32, f64, b1
-from .immediates import imm64, uimm8, ieee32, ieee64, immvector, intcc, floatcc
-from . import entities
+from base.immediates import imm64, uimm8, ieee32, ieee64, immvector
+from base.immediates import intcc, floatcc
+from base import entities
 
 instructions = InstructionGroup("base", "Shared base instruction set")
 

lib/cretonne/meta/isa/riscv/recipes.py

@@ -10,8 +10,8 @@ instruction formats described in the reference:
 """
 from __future__ import absolute_import
 from cretonne import EncRecipe
-from cretonne.formats import Binary, BinaryImm
 from cdsl.predicates import IsSignedInt
+from base.formats import Binary, BinaryImm
 
 # The low 7 bits of a RISC-V instruction is the base opcode. All 32-bit
 # instructions have 11 as the two low bits, with bits 6:2 determining the base