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"""
mwrap_typecheck.py — Semantic analysis and type classification.
Copyright (c) 2007-2008 David Bindel
See the file COPYING for copying permissions
Converted to Python by Zydrunas Gimbutas (2026),
with assistance from Claude Code / Claude Opus 4.6 (Anthropic).
"""
import sys
from mwrap_ast import (
VT, Expr, TypeQual, Var, Func,
promote_int,
iospec_is_input, iospec_is_output, iospec_is_inonly,
)
# ---------------------------------------------------------------------------
# Label assignment
# ---------------------------------------------------------------------------
def _label_dim_args_expr(args, icount):
"""Assign input_label to dimension expressions; returns updated icount."""
for e in args:
e.input_label = icount
icount += 1
return icount
def _label_dim_args_var(vars, icount):
"""Walk var list, label dimension expressions."""
for v in vars:
if v.qual:
icount = _label_dim_args_expr(v.qual.args, icount)
return icount
def _label_args_var(vars, icount, ocount):
"""Assign input/output labels to vars; returns (icount, ocount)."""
for v in vars:
if iospec_is_input(v.iospec):
v.input_label = icount
icount += 1
if iospec_is_output(v.iospec):
v.output_label = ocount
ocount += 1
return icount, ocount
def label_args(f):
"""Assign prhs[] / plhs[] indices to a Func's variables."""
icount = 1 if f.thisv else 0
ocount = 0
icount, ocount = _label_args_var(f.ret, icount, ocount)
icount, ocount = _label_args_var(f.args, icount, ocount)
icount = _label_dim_args_var(f.ret, icount)
icount = _label_dim_args_var(f.args, icount)
# ---------------------------------------------------------------------------
# Type-info assignment
# ---------------------------------------------------------------------------
def _assign_scalar_tinfo(v, line, tags, tagp, tagr, taga, tagar):
"""Assign tinfo for a scalar/complex type. Returns error count."""
if not v.qual:
v.tinfo = tags
elif v.qual.qual == '*':
v.tinfo = tagp
elif v.qual.qual == '&':
v.tinfo = tagr
elif v.qual.qual == 'a':
v.tinfo = taga
# check max 2D
if len(v.qual.args) > 2:
print(f"Error ({line}): Array {v.name} should be 1D or 2D",
file=sys.stderr)
return 1
elif v.qual.qual == 'r':
v.tinfo = tagar
if tagar == VT.unk:
print(f"Error ({line}): Array ref {v.name} must be to a real array",
file=sys.stderr)
return 1
if len(v.qual.args) > 2:
print(f"Error ({line}): Array {v.name} should be 1D or 2D",
file=sys.stderr)
return 1
else:
assert False, f"Unknown qual '{v.qual.qual}'"
return 0
def assign_tinfo(ctx, v, line):
"""Assign VT_* tinfo to a single Var. Returns error count."""
bt = v.basetype
if ctx.is_scalar_type(bt):
return _assign_scalar_tinfo(v, line,
VT.scalar, VT.p_scalar, VT.r_scalar,
VT.array, VT.rarray)
elif ctx.is_cscalar_type(bt):
return _assign_scalar_tinfo(v, line,
VT.cscalar, VT.p_cscalar, VT.r_cscalar,
VT.carray, VT.unk)
elif ctx.is_zscalar_type(bt):
return _assign_scalar_tinfo(v, line,
VT.zscalar, VT.p_zscalar, VT.r_zscalar,
VT.zarray, VT.unk)
elif bt == "const":
if v.qual:
print(f"Error ({line}): Constant {v.name} cannot have modifiers",
file=sys.stderr)
return 1
v.tinfo = VT.const
# Strip quotes from name if present
if v.name and v.name.startswith("'"):
v.name = v.name.replace("'", "")
elif bt == "cstring":
if v.qual and v.qual.qual != 'a':
print(f"Error ({line}): String type {v.name} cannot have modifiers",
file=sys.stderr)
return 1
if v.qual and len(v.qual.args) > 1:
print(f"Error ({line}): Strings are one dimensional",
file=sys.stderr)
return 1
v.tinfo = VT.string
elif bt == "mxArray":
if v.qual:
print(f"Error ({line}): mxArray {v.name} cannot have modifiers",
file=sys.stderr)
return 1
v.tinfo = VT.mx
else:
# Object type
if not v.qual:
v.tinfo = VT.obj
elif v.qual.qual == '*':
v.tinfo = VT.p_obj
elif v.qual.qual == '&':
v.tinfo = VT.r_obj
elif v.qual.qual in ('a', 'r'):
print(f"Error ({line}): {v.name} cannot be an array of object {bt}",
file=sys.stderr)
return 1
else:
assert False
return 0
# ---------------------------------------------------------------------------
# Return-value validation
# ---------------------------------------------------------------------------
def _typecheck_return(ctx, ret, line):
if not ret:
return 0
v = ret[0]
err = assign_tinfo(ctx, v, line)
if v.tinfo in (VT.array, VT.carray, VT.zarray):
if not (v.qual and v.qual.args):
print(f"Error ({line}): Return array {v.name} must have dims",
file=sys.stderr)
err += 1
elif v.tinfo == VT.const:
print(f"Error ({line}): Cannot return constant", file=sys.stderr)
err += 1
elif v.tinfo == VT.rarray:
print(f"Error ({line}): Ref to array {v.name} looks just like array on return",
file=sys.stderr)
err += 1
elif v.tinfo == VT.string and v.qual:
print(f"Error ({line}): Return string {v.name} cannot have dims",
file=sys.stderr)
err += 1
return err
# ---------------------------------------------------------------------------
# Argument validation
# ---------------------------------------------------------------------------
def _typecheck_args(ctx, args, line):
err = 0
for v in args:
err += assign_tinfo(ctx, v, line)
if iospec_is_inonly(v.iospec):
continue
# Output / inout checks
if v.name and v.name[0:1].isdigit():
print(f"Error ({line}): Number {v.name} cannot be output",
file=sys.stderr)
err += 1
if (v.tinfo in (VT.obj, VT.p_obj, VT.r_obj) and
not ctx.is_mxarray_type(v.basetype)):
print(f"Error ({line}): Object {v.name} cannot be output",
file=sys.stderr)
err += 1
elif (v.tinfo in (VT.array, VT.carray, VT.zarray, VT.rarray) and
v.iospec == 'o' and
not (v.qual and v.qual.args)):
print(f"Error ({line}): Output array {v.name} must have dims",
file=sys.stderr)
err += 1
elif v.tinfo == VT.rarray and not iospec_is_output(v.iospec):
print(f"Error ({line}): Array ref {v.name} *must* be output",
file=sys.stderr)
err += 1
elif v.tinfo == VT.scalar:
print(f"Error ({line}): Scalar {v.name} cannot be output",
file=sys.stderr)
err += 1
elif v.tinfo == VT.const:
print(f"Error ({line}): Constant {v.name} cannot be output",
file=sys.stderr)
err += 1
elif v.tinfo == VT.string and not (v.qual and v.qual.args):
print(f"Error ({line}): String {v.name} cannot be output without size",
file=sys.stderr)
err += 1
elif v.tinfo == VT.mx and v.iospec == 'b':
print(f"Error ({line}): mxArray {v.name} cannot be used for inout",
file=sys.stderr)
err += 1
return err
# ---------------------------------------------------------------------------
# Fortran-ize arguments
# ---------------------------------------------------------------------------
def _fortranize_args_var(args, line):
"""Convert scalar args to pointer-to-scalar for FORTRAN. Returns error count."""
err = 0
for v in args:
if v.tinfo in (VT.obj, VT.p_obj, VT.r_obj):
print(f"Error ({line}): Cannot pass object {v.name} to FORTRAN",
file=sys.stderr)
err += 1
elif v.tinfo == VT.rarray:
print(f"Error ({line}): Cannot pass pointer ref {v.name} to FORTRAN",
file=sys.stderr)
err += 1
elif v.tinfo == VT.string:
print(f"Warning ({line}): Danger passing C string {v.name} to FORTRAN",
file=sys.stderr)
elif v.tinfo in (VT.scalar, VT.r_scalar):
v.tinfo = VT.p_scalar
elif v.tinfo in (VT.cscalar, VT.r_cscalar):
v.tinfo = VT.p_cscalar
elif v.tinfo in (VT.zscalar, VT.r_zscalar):
v.tinfo = VT.p_zscalar
return err
def _fortranize_ret(v, line):
if not v:
return 0
if v.tinfo in (VT.cscalar, VT.zscalar):
print(f"Warning ({line}): Danger returning complex from FORTRAN",
file=sys.stderr)
elif v.tinfo != VT.scalar:
print(f"Error ({line}): Can only return scalars from FORTRAN",
file=sys.stderr)
return 1
return 0
def _fortranize_args(f, line):
if not f.fort:
return 0
err = _fortranize_args_var(f.args, line)
if f.ret:
err += _fortranize_ret(f.ret[0], line)
return err
# ---------------------------------------------------------------------------
# Top-level typecheck
# ---------------------------------------------------------------------------
def typecheck(ctx, f, line):
"""Run full semantic analysis on a Func. Returns error count."""
label_args(f)
return (_typecheck_return(ctx, f.ret, line) +
_typecheck_args(ctx, f.args, line) +
_fortranize_args(f, line))
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