| 1 | #!/usr/bin/env python2
|
| 2 | # Copyright 2016 Andy Chu. All rights reserved.
|
| 3 | # Licensed under the Apache License, Version 2.0 (the "License");
|
| 4 | # you may not use this file except in compliance with the License.
|
| 5 | # You may obtain a copy of the License at
|
| 6 | #
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| 7 | # http://www.apache.org/licenses/LICENSE-2.0
|
| 8 | """
|
| 9 | cmd_eval.py -- Interpreter for the command language.
|
| 10 |
|
| 11 | Problems:
|
| 12 | $ < Makefile cat | < NOTES.txt head
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| 13 |
|
| 14 | This just does head? Last one wins.
|
| 15 | """
|
| 16 | from __future__ import print_function
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| 17 |
|
| 18 | import sys
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| 19 |
|
| 20 | from _devbuild.gen.id_kind_asdl import Id
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| 21 | from _devbuild.gen.option_asdl import option_i
|
| 22 | from _devbuild.gen.syntax_asdl import (
|
| 23 | IntParamBox,
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| 24 | loc,
|
| 25 | loc_t,
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| 26 | loc_e,
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| 27 | Token,
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| 28 | CompoundWord,
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| 29 | command,
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| 30 | command_e,
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| 31 | command_t,
|
| 32 | command_str,
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| 33 | condition,
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| 34 | condition_e,
|
| 35 | condition_t,
|
| 36 | case_arg,
|
| 37 | case_arg_e,
|
| 38 | case_arg_t,
|
| 39 | BraceGroup,
|
| 40 | Proc,
|
| 41 | Func,
|
| 42 | assign_op_e,
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| 43 | expr_t,
|
| 44 | proc_sig,
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| 45 | proc_sig_e,
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| 46 | redir_param,
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| 47 | redir_param_e,
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| 48 | for_iter,
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| 49 | for_iter_e,
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| 50 | pat,
|
| 51 | pat_e,
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| 52 | word,
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| 53 | Eggex,
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| 54 | )
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| 55 | from _devbuild.gen.runtime_asdl import (
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| 56 | cmd_value,
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| 57 | cmd_value_e,
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| 58 | CommandStatus,
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| 59 | flow_e,
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| 60 | RedirValue,
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| 61 | redirect_arg,
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| 62 | ProcArgs,
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| 63 | scope_e,
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| 64 | StatusArray,
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| 65 | )
|
| 66 | from _devbuild.gen.types_asdl import redir_arg_type_e
|
| 67 | from _devbuild.gen.value_asdl import (value, value_e, value_t, y_lvalue,
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| 68 | y_lvalue_e, y_lvalue_t, LeftName, Obj)
|
| 69 |
|
| 70 | from core import dev
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| 71 | from core import error
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| 72 | from core import executor
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| 73 | from core.error import e_die, e_die_status
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| 74 | from core import num
|
| 75 | from core import pyos # Time(). TODO: rename
|
| 76 | from core import pyutil
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| 77 | from core import state
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| 78 | from display import ui
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| 79 | from core import util
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| 80 | from core import vm
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| 81 | from frontend import consts
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| 82 | from frontend import lexer
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| 83 | from frontend import location
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| 84 | from osh import braces
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| 85 | from osh import sh_expr_eval
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| 86 | from osh import word_eval
|
| 87 | from mycpp import mops
|
| 88 | from mycpp import mylib
|
| 89 | from mycpp.mylib import log, probe, switch, tagswitch
|
| 90 | from ysh import expr_eval
|
| 91 | from ysh import func_proc
|
| 92 | from ysh import val_ops
|
| 93 |
|
| 94 | import posix_ as posix
|
| 95 | import libc # for fnmatch
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| 96 | # Import this name directly because the C++ translation uses macros literally.
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| 97 | from libc import FNM_CASEFOLD
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| 98 |
|
| 99 | from typing import List, Dict, Tuple, Optional, Any, cast, TYPE_CHECKING
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| 100 |
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| 101 | if TYPE_CHECKING:
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| 102 | from _devbuild.gen.option_asdl import builtin_t
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| 103 | from _devbuild.gen.runtime_asdl import cmd_value_t
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| 104 | from _devbuild.gen.syntax_asdl import Redir, EnvPair
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| 105 | from core.alloc import Arena
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| 106 | from core import optview
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| 107 | from core.vm import _Executor, _AssignBuiltin
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| 108 | from builtin import trap_osh
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| 109 |
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| 110 | # flags for main_loop.Batch, ExecuteAndCatch. TODO: Should probably in
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| 111 | # ExecuteAndCatch, along with SetValue() flags.
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| 112 | IsMainProgram = 1 << 0 # the main shell program, not eval/source/subshell
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| 113 | RaiseControlFlow = 1 << 1 # eval/source builtins
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| 114 | OptimizeSubshells = 1 << 2
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| 115 | MarkLastCommands = 1 << 3
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| 116 | NoDebugTrap = 1 << 4
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| 117 | NoErrTrap = 1 << 5
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| 118 |
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| 119 |
|
| 120 | def MakeBuiltinArgv(argv1):
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| 121 | # type: (List[str]) -> cmd_value.Argv
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| 122 | argv = [''] # dummy for argv[0]
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| 123 | argv.extend(argv1)
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| 124 | missing = None # type: CompoundWord
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| 125 | return cmd_value.Argv(argv, [missing] * len(argv), False, None)
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| 126 |
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| 127 |
|
| 128 | class Deps(object):
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| 129 |
|
| 130 | def __init__(self):
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| 131 | # type: () -> None
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| 132 | self.mutable_opts = None # type: state.MutableOpts
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| 133 | self.dumper = None # type: dev.CrashDumper
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| 134 | self.debug_f = None # type: util._DebugFile
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| 135 |
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| 136 |
|
| 137 | def _HasManyStatuses(node):
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| 138 | # type: (command_t) -> bool
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| 139 | """Code patterns that are bad for POSIX errexit. For YSH strict_errexit.
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| 140 |
|
| 141 | Note: strict_errexit also uses
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| 142 | shopt --unset _allow_command_sub _allow_process_sub
|
| 143 | """
|
| 144 | UP_node = node
|
| 145 | with tagswitch(node) as case:
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| 146 | # Atoms.
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| 147 | # TODO: Do we need YSH atoms here?
|
| 148 | if case(command_e.Simple, command_e.DBracket, command_e.DParen):
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| 149 | return False
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| 150 |
|
| 151 | elif case(command_e.Redirect):
|
| 152 | node = cast(command.Redirect, UP_node)
|
| 153 | return _HasManyStatuses(node.child)
|
| 154 |
|
| 155 | elif case(command_e.Sentence):
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| 156 | # Sentence check is for if false; versus if false
|
| 157 | node = cast(command.Sentence, UP_node)
|
| 158 | return _HasManyStatuses(node.child)
|
| 159 |
|
| 160 | elif case(command_e.Pipeline):
|
| 161 | node = cast(command.Pipeline, UP_node)
|
| 162 | if len(node.children) == 1:
|
| 163 | # '! false' is a pipeline that we want to ALLOW
|
| 164 | # '! ( echo subshell )' is DISALLWOED
|
| 165 | return _HasManyStatuses(node.children[0])
|
| 166 | else:
|
| 167 | # Multiple parts like 'ls | wc' is disallowed
|
| 168 | return True
|
| 169 |
|
| 170 | # - ShAssignment could be allowed, though its exit code will always be
|
| 171 | # 0 without command subs
|
| 172 | # - Naively, (non-singleton) pipelines could be allowed because pipefail.
|
| 173 | # BUT could be a proc executed inside a child process, which causes a
|
| 174 | # problem: the strict_errexit check has to occur at runtime and there's
|
| 175 | # no way to signal it ot the parent.
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| 176 |
|
| 177 | return True
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| 178 |
|
| 179 |
|
| 180 | def PlusEquals(old_val, val):
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| 181 | # type: (value_t, value_t) -> value_t
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| 182 | """Implement s+=val, typeset s+=val, etc."""
|
| 183 |
|
| 184 | UP_old_val = old_val
|
| 185 | UP_val = val
|
| 186 |
|
| 187 | tag = val.tag()
|
| 188 |
|
| 189 | with tagswitch(old_val) as case:
|
| 190 | if case(value_e.Undef):
|
| 191 | pass # val is RHS
|
| 192 |
|
| 193 | elif case(value_e.Str):
|
| 194 | if tag == value_e.Str:
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| 195 | old_val = cast(value.Str, UP_old_val)
|
| 196 | str_to_append = cast(value.Str, UP_val)
|
| 197 | val = value.Str(old_val.s + str_to_append.s)
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| 198 |
|
| 199 | elif tag == value_e.BashArray:
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| 200 | e_die("Can't append array to string")
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| 201 |
|
| 202 | else:
|
| 203 | raise AssertionError() # parsing should prevent this
|
| 204 |
|
| 205 | elif case(value_e.BashArray):
|
| 206 | if tag == value_e.Str:
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| 207 | e_die("Can't append string to array")
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| 208 |
|
| 209 | elif tag == value_e.BashArray:
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| 210 | old_val = cast(value.BashArray, UP_old_val)
|
| 211 | to_append = cast(value.BashArray, UP_val)
|
| 212 |
|
| 213 | # TODO: MUTATE the existing value for efficiency?
|
| 214 | strs = [] # type: List[str]
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| 215 | strs.extend(old_val.strs)
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| 216 | strs.extend(to_append.strs)
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| 217 | val = value.BashArray(strs)
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| 218 |
|
| 219 | else:
|
| 220 | raise AssertionError() # parsing should prevent this
|
| 221 |
|
| 222 | elif case(value_e.BashAssoc):
|
| 223 | # TODO: Could try to match bash, it will append to ${A[0]}
|
| 224 | pass
|
| 225 |
|
| 226 | else:
|
| 227 | e_die("Can't append to value of type %s" % ui.ValType(old_val))
|
| 228 |
|
| 229 | return val
|
| 230 |
|
| 231 |
|
| 232 | class ctx_LoopLevel(object):
|
| 233 | """For checking for invalid control flow."""
|
| 234 |
|
| 235 | def __init__(self, cmd_ev):
|
| 236 | # type: (CommandEvaluator) -> None
|
| 237 | cmd_ev.loop_level += 1
|
| 238 | self.cmd_ev = cmd_ev
|
| 239 |
|
| 240 | def __enter__(self):
|
| 241 | # type: () -> None
|
| 242 | pass
|
| 243 |
|
| 244 | def __exit__(self, type, value, traceback):
|
| 245 | # type: (Any, Any, Any) -> None
|
| 246 | self.cmd_ev.loop_level -= 1
|
| 247 |
|
| 248 |
|
| 249 | class CommandEvaluator(object):
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| 250 | """Executes the program by tree-walking.
|
| 251 |
|
| 252 | It also does some double-dispatch by passing itself into Eval() for
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| 253 | Compound/WordPart.
|
| 254 | """
|
| 255 |
|
| 256 | def __init__(
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| 257 | self,
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| 258 | mem, # type: state.Mem
|
| 259 | exec_opts, # type: optview.Exec
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| 260 | errfmt, # type: ui.ErrorFormatter
|
| 261 | procs, # type: state.Procs
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| 262 | assign_builtins, # type: Dict[builtin_t, _AssignBuiltin]
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| 263 | arena, # type: Arena
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| 264 | cmd_deps, # type: Deps
|
| 265 | trap_state, # type: trap_osh.TrapState
|
| 266 | signal_safe, # type: pyos.SignalSafe
|
| 267 | ):
|
| 268 | # type: (...) -> None
|
| 269 | """
|
| 270 | Args:
|
| 271 | mem: Mem instance for storing variables
|
| 272 | procs: dict of SHELL functions or 'procs'
|
| 273 | builtins: dict of builtin callables
|
| 274 | TODO: This should only be for assignment builtins?
|
| 275 | cmd_deps: A bundle of stateless code
|
| 276 | """
|
| 277 | self.shell_ex = None # type: _Executor
|
| 278 | self.arith_ev = None # type: sh_expr_eval.ArithEvaluator
|
| 279 | self.bool_ev = None # type: sh_expr_eval.BoolEvaluator
|
| 280 | self.expr_ev = None # type: expr_eval.ExprEvaluator
|
| 281 | self.word_ev = None # type: word_eval.AbstractWordEvaluator
|
| 282 | self.tracer = None # type: dev.Tracer
|
| 283 |
|
| 284 | self.mem = mem
|
| 285 | # This is for shopt and set -o. They are initialized by flags.
|
| 286 | self.exec_opts = exec_opts
|
| 287 | self.errfmt = errfmt
|
| 288 | self.procs = procs
|
| 289 | self.assign_builtins = assign_builtins
|
| 290 | self.arena = arena
|
| 291 |
|
| 292 | self.mutable_opts = cmd_deps.mutable_opts
|
| 293 | self.dumper = cmd_deps.dumper
|
| 294 | self.debug_f = cmd_deps.debug_f # Used by ShellFuncAction too
|
| 295 |
|
| 296 | self.trap_state = trap_state
|
| 297 | self.signal_safe = signal_safe
|
| 298 |
|
| 299 | self.loop_level = 0 # for detecting bad top-level break/continue
|
| 300 | self.check_command_sub_status = False # a hack. Modified by ShellExecutor
|
| 301 |
|
| 302 | self.status_array_pool = [] # type: List[StatusArray]
|
| 303 |
|
| 304 | def CheckCircularDeps(self):
|
| 305 | # type: () -> None
|
| 306 | assert self.arith_ev is not None
|
| 307 | assert self.bool_ev is not None
|
| 308 | # Disabled for push OSH
|
| 309 | #assert self.expr_ev is not None
|
| 310 | assert self.word_ev is not None
|
| 311 |
|
| 312 | def _RunAssignBuiltin(self, cmd_val):
|
| 313 | # type: (cmd_value.Assign) -> int
|
| 314 | """Run an assignment builtin.
|
| 315 |
|
| 316 | Except blocks copied from RunBuiltin.
|
| 317 | """
|
| 318 | builtin_func = self.assign_builtins.get(cmd_val.builtin_id)
|
| 319 | if builtin_func is None:
|
| 320 | # This only happens with alternative Oils interpreters.
|
| 321 | e_die("Assignment builtin %r not configured" % cmd_val.argv[0],
|
| 322 | cmd_val.arg_locs[0])
|
| 323 |
|
| 324 | io_errors = [] # type: List[error.IOError_OSError]
|
| 325 | with vm.ctx_FlushStdout(io_errors):
|
| 326 | with ui.ctx_Location(self.errfmt, cmd_val.arg_locs[0]):
|
| 327 | try:
|
| 328 | status = builtin_func.Run(cmd_val)
|
| 329 | except (IOError, OSError) as e:
|
| 330 | # e.g. declare -p > /dev/full
|
| 331 | self.errfmt.PrintMessage(
|
| 332 | '%s builtin I/O error: %s' %
|
| 333 | (cmd_val.argv[0], pyutil.strerror(e)),
|
| 334 | cmd_val.arg_locs[0])
|
| 335 | return 1
|
| 336 | except error.Usage as e: # Copied from RunBuiltin
|
| 337 | arg0 = cmd_val.argv[0]
|
| 338 | self.errfmt.PrefixPrint(e.msg, '%r ' % arg0, e.location)
|
| 339 | return 2 # consistent error code for usage error
|
| 340 |
|
| 341 | if len(io_errors): # e.g. declare -p > /dev/full
|
| 342 | self.errfmt.PrintMessage(
|
| 343 | '%s builtin I/O: %s' %
|
| 344 | (cmd_val.argv[0], pyutil.strerror(io_errors[0])),
|
| 345 | cmd_val.arg_locs[0])
|
| 346 | return 1
|
| 347 |
|
| 348 | return status
|
| 349 |
|
| 350 | def _CheckStatus(self, status, cmd_st, node, default_loc):
|
| 351 | # type: (int, CommandStatus, command_t, loc_t) -> None
|
| 352 | """Raises error.ErrExit, maybe with location info attached."""
|
| 353 |
|
| 354 | assert status >= 0, status
|
| 355 |
|
| 356 | if status == 0:
|
| 357 | return # Nothing to do
|
| 358 |
|
| 359 | self._MaybeRunErrTrap()
|
| 360 |
|
| 361 | if self.exec_opts.errexit():
|
| 362 | # NOTE: Sometimes we print 2 errors
|
| 363 | # - 'type -z' has a UsageError with location, then errexit
|
| 364 | # - '> /nonexistent' has an I/O error, then errexit
|
| 365 | # - Pipelines and subshells are compound. Commands within them fail.
|
| 366 | # - however ( exit 33 ) only prints one message.
|
| 367 | #
|
| 368 | # But we will want something like 'false' to have location info.
|
| 369 |
|
| 370 | UP_node = node
|
| 371 | with tagswitch(node) as case:
|
| 372 | if case(command_e.ShAssignment):
|
| 373 | node = cast(command.ShAssignment, UP_node)
|
| 374 | cmd_st.show_code = True # leaf
|
| 375 | # Note: we show errors from assignments a=$(false) rarely: when
|
| 376 | # errexit, inherit_errexit, verbose_errexit are on, but
|
| 377 | # command_sub_errexit is off!
|
| 378 |
|
| 379 | # Note: a subshell often doesn't fail on its own.
|
| 380 | elif case(command_e.Subshell):
|
| 381 | node = cast(command.Subshell, UP_node)
|
| 382 | cmd_st.show_code = True # not sure about this, e.g. ( exit 42 )
|
| 383 |
|
| 384 | elif case(command_e.Pipeline):
|
| 385 | node = cast(command.Pipeline, UP_node)
|
| 386 | cmd_st.show_code = True # not sure about this
|
| 387 | # TODO: We should show which element of the pipeline failed!
|
| 388 |
|
| 389 | desc = command_str(node.tag())
|
| 390 |
|
| 391 | # Override location if explicitly passed.
|
| 392 | # Note: this produces better results for process sub
|
| 393 | # echo <(sort x)
|
| 394 | # and different results for some pipelines:
|
| 395 | # { ls; false; } | wc -l; echo hi # Point to | or first { ?
|
| 396 | if default_loc.tag() != loc_e.Missing:
|
| 397 | blame_loc = default_loc # type: loc_t
|
| 398 | else:
|
| 399 | blame_loc = location.TokenForCommand(node)
|
| 400 |
|
| 401 | msg = '%s failed with status %d' % (desc, status)
|
| 402 | raise error.ErrExit(status,
|
| 403 | msg,
|
| 404 | blame_loc,
|
| 405 | show_code=cmd_st.show_code)
|
| 406 |
|
| 407 | def _EvalRedirect(self, r):
|
| 408 | # type: (Redir) -> RedirValue
|
| 409 |
|
| 410 | result = RedirValue(r.op.id, r.op, r.loc, None)
|
| 411 |
|
| 412 | arg = r.arg
|
| 413 | UP_arg = arg
|
| 414 | with tagswitch(arg) as case:
|
| 415 | if case(redir_param_e.Word):
|
| 416 | arg_word = cast(CompoundWord, UP_arg)
|
| 417 |
|
| 418 | # Note: needed for redirect like 'echo foo > x$LINENO'
|
| 419 | self.mem.SetTokenForLine(r.op)
|
| 420 |
|
| 421 | # Could be computed at parse time?
|
| 422 | redir_type = consts.RedirArgType(r.op.id)
|
| 423 |
|
| 424 | if redir_type == redir_arg_type_e.Path:
|
| 425 | # Redirects with path arguments are evaluated in a special
|
| 426 | # way. bash and zsh allow globbing a path, but
|
| 427 | # dash/ash/mksh don't.
|
| 428 | #
|
| 429 | # If there are multiple files, zsh opens BOTH, but bash
|
| 430 | # makes the command fail with status 1. We mostly follow
|
| 431 | # bash behavior.
|
| 432 |
|
| 433 | # These don't match bash/zsh behavior
|
| 434 | # val = self.word_ev.EvalWordToString(arg_word)
|
| 435 | # val, has_extglob = self.word_ev.EvalWordToPattern(arg_word)
|
| 436 | # Short-circuit with word_.StaticEval() also doesn't work
|
| 437 | # with globs
|
| 438 |
|
| 439 | # mycpp needs this explicit declaration
|
| 440 | b = braces.BraceDetect(
|
| 441 | arg_word) # type: Optional[word.BracedTree]
|
| 442 | if b is not None:
|
| 443 | raise error.RedirectEval(
|
| 444 | 'Brace expansion not allowed (try adding quotes)',
|
| 445 | arg_word)
|
| 446 |
|
| 447 | # Needed for globbing behavior
|
| 448 | files = self.word_ev.EvalWordSequence([arg_word])
|
| 449 |
|
| 450 | n = len(files)
|
| 451 | if n == 0:
|
| 452 | # happens in OSH on empty elision
|
| 453 | # in YSH because simple_word_eval globs to zero
|
| 454 | raise error.RedirectEval(
|
| 455 | "Can't redirect to zero files", arg_word)
|
| 456 | if n > 1:
|
| 457 | raise error.RedirectEval(
|
| 458 | "Can't redirect to more than one file", arg_word)
|
| 459 |
|
| 460 | result.arg = redirect_arg.Path(files[0])
|
| 461 | return result
|
| 462 |
|
| 463 | elif redir_type == redir_arg_type_e.Desc: # e.g. 1>&2, 1>&-, 1>&2-
|
| 464 | val = self.word_ev.EvalWordToString(arg_word)
|
| 465 | t = val.s
|
| 466 | if len(t) == 0:
|
| 467 | raise error.RedirectEval(
|
| 468 | "Redirect descriptor can't be empty", arg_word)
|
| 469 | return None
|
| 470 |
|
| 471 | try:
|
| 472 | if t == '-':
|
| 473 | result.arg = redirect_arg.CloseFd
|
| 474 | elif t[-1] == '-':
|
| 475 | target_fd = int(t[:-1])
|
| 476 | result.arg = redirect_arg.MoveFd(target_fd)
|
| 477 | else:
|
| 478 | result.arg = redirect_arg.CopyFd(int(t))
|
| 479 | except ValueError:
|
| 480 | raise error.RedirectEval(
|
| 481 | 'Invalid descriptor %r. Expected D, -, or D- where D is an '
|
| 482 | 'integer' % t, arg_word)
|
| 483 | return None
|
| 484 |
|
| 485 | return result
|
| 486 |
|
| 487 | elif redir_type == redir_arg_type_e.Here: # here word
|
| 488 | val = self.word_ev.EvalWordToString(arg_word)
|
| 489 | assert val.tag() == value_e.Str, val
|
| 490 | # NOTE: bash and mksh both add \n
|
| 491 | result.arg = redirect_arg.HereDoc(val.s + '\n')
|
| 492 | return result
|
| 493 |
|
| 494 | else:
|
| 495 | raise AssertionError('Unknown redirect op')
|
| 496 |
|
| 497 | elif case(redir_param_e.HereDoc):
|
| 498 | arg = cast(redir_param.HereDoc, UP_arg)
|
| 499 | w = CompoundWord(
|
| 500 | arg.stdin_parts) # HACK: Wrap it in a word to eval
|
| 501 | val = self.word_ev.EvalWordToString(w)
|
| 502 | assert val.tag() == value_e.Str, val
|
| 503 | result.arg = redirect_arg.HereDoc(val.s)
|
| 504 | return result
|
| 505 |
|
| 506 | else:
|
| 507 | raise AssertionError('Unknown redirect type')
|
| 508 |
|
| 509 | raise AssertionError('for -Wreturn-type in C++')
|
| 510 |
|
| 511 | def _RunSimpleCommand(self, cmd_val, cmd_st, run_flags):
|
| 512 | # type: (cmd_value_t, CommandStatus, int) -> int
|
| 513 | """Private interface to run a simple command (including assignment)."""
|
| 514 | UP_cmd_val = cmd_val
|
| 515 | with tagswitch(UP_cmd_val) as case:
|
| 516 | if case(cmd_value_e.Argv):
|
| 517 | cmd_val = cast(cmd_value.Argv, UP_cmd_val)
|
| 518 | self.tracer.OnSimpleCommand(cmd_val.argv)
|
| 519 | return self.shell_ex.RunSimpleCommand(cmd_val, cmd_st,
|
| 520 | run_flags)
|
| 521 |
|
| 522 | elif case(cmd_value_e.Assign):
|
| 523 | cmd_val = cast(cmd_value.Assign, UP_cmd_val)
|
| 524 | self.tracer.OnAssignBuiltin(cmd_val)
|
| 525 | return self._RunAssignBuiltin(cmd_val)
|
| 526 |
|
| 527 | else:
|
| 528 | raise AssertionError()
|
| 529 |
|
| 530 | def _EvalTempEnv(self, more_env, flags):
|
| 531 | # type: (List[EnvPair], int) -> None
|
| 532 | """For FOO=1 cmd."""
|
| 533 | for e_pair in more_env:
|
| 534 | val = self.word_ev.EvalRhsWord(e_pair.val)
|
| 535 | # Set each var so the next one can reference it. Example:
|
| 536 | # FOO=1 BAR=$FOO ls /
|
| 537 | self.mem.SetNamed(location.LName(e_pair.name),
|
| 538 | val,
|
| 539 | scope_e.LocalOnly,
|
| 540 | flags=flags)
|
| 541 |
|
| 542 | def _StrictErrExit(self, node):
|
| 543 | # type: (command_t) -> None
|
| 544 | if not (self.exec_opts.errexit() and self.exec_opts.strict_errexit()):
|
| 545 | return
|
| 546 |
|
| 547 | if _HasManyStatuses(node):
|
| 548 | node_str = ui.CommandType(node)
|
| 549 | e_die(
|
| 550 | "strict_errexit only allows simple commands in conditionals (got %s). "
|
| 551 | % node_str, loc.Command(node))
|
| 552 |
|
| 553 | def _StrictErrExitList(self, node_list):
|
| 554 | # type: (List[command_t]) -> None
|
| 555 | """Not allowed, too confusing:
|
| 556 |
|
| 557 | if grep foo eggs.txt; grep bar eggs.txt; then echo hi fi
|
| 558 | """
|
| 559 | if not (self.exec_opts.errexit() and self.exec_opts.strict_errexit()):
|
| 560 | return
|
| 561 |
|
| 562 | if len(node_list) > 1:
|
| 563 | e_die(
|
| 564 | "strict_errexit only allows a single command. Hint: use 'try'.",
|
| 565 | loc.Command(node_list[0]))
|
| 566 |
|
| 567 | assert len(node_list) > 0
|
| 568 | node = node_list[0]
|
| 569 | if _HasManyStatuses(node):
|
| 570 | # TODO: consolidate error message with above
|
| 571 | node_str = ui.CommandType(node)
|
| 572 | e_die(
|
| 573 | "strict_errexit only allows simple commands in conditionals (got %s). "
|
| 574 | % node_str, loc.Command(node))
|
| 575 |
|
| 576 | def _EvalCondition(self, cond, blame_tok):
|
| 577 | # type: (condition_t, Token) -> bool
|
| 578 | """
|
| 579 | Args:
|
| 580 | spid: for OSH conditions, where errexit was disabled -- e.g. if
|
| 581 | for YSH conditions, it would be nice to blame the ( instead
|
| 582 | """
|
| 583 | b = False
|
| 584 | UP_cond = cond
|
| 585 | with tagswitch(cond) as case:
|
| 586 | if case(condition_e.Shell):
|
| 587 | cond = cast(condition.Shell, UP_cond)
|
| 588 | self._StrictErrExitList(cond.commands)
|
| 589 | with state.ctx_ErrExit(self.mutable_opts, False, blame_tok):
|
| 590 | cond_status = self._ExecuteList(cond.commands)
|
| 591 |
|
| 592 | b = cond_status == 0
|
| 593 |
|
| 594 | elif case(condition_e.YshExpr):
|
| 595 | cond = cast(condition.YshExpr, UP_cond)
|
| 596 | obj = self.expr_ev.EvalExpr(cond.e, blame_tok)
|
| 597 | b = val_ops.ToBool(obj)
|
| 598 |
|
| 599 | return b
|
| 600 |
|
| 601 | def _EvalCaseArg(self, arg, blame):
|
| 602 | # type: (case_arg_t, loc_t) -> value_t
|
| 603 | """Evaluate a `case_arg` into a `value_t` which can be matched on in a case
|
| 604 | command.
|
| 605 | """
|
| 606 | UP_arg = arg
|
| 607 | with tagswitch(arg) as case:
|
| 608 | if case(case_arg_e.Word):
|
| 609 | arg = cast(case_arg.Word, UP_arg)
|
| 610 | return self.word_ev.EvalWordToString(arg.w)
|
| 611 |
|
| 612 | elif case(case_arg_e.YshExpr):
|
| 613 | arg = cast(case_arg.YshExpr, UP_arg)
|
| 614 | return self.expr_ev.EvalExpr(arg.e, blame)
|
| 615 |
|
| 616 | else:
|
| 617 | raise NotImplementedError()
|
| 618 |
|
| 619 | def _DoVarDecl(self, node):
|
| 620 | # type: (command.VarDecl) -> int
|
| 621 | # x = 'foo' in Hay blocks
|
| 622 | if node.keyword is None:
|
| 623 | # Note: there's only one LHS
|
| 624 | lhs0 = node.lhs[0]
|
| 625 | lval = LeftName(lhs0.name, lhs0.left)
|
| 626 | assert node.rhs is not None, node
|
| 627 | val = self.expr_ev.EvalExpr(node.rhs, loc.Missing)
|
| 628 |
|
| 629 | self.mem.SetNamed(lval,
|
| 630 | val,
|
| 631 | scope_e.LocalOnly,
|
| 632 | flags=state.SetReadOnly)
|
| 633 |
|
| 634 | else: # var or const
|
| 635 | flags = (state.SetReadOnly
|
| 636 | if node.keyword.id == Id.KW_Const else 0)
|
| 637 |
|
| 638 | # var x, y does null initialization
|
| 639 | if node.rhs is None:
|
| 640 | for i, lhs_val in enumerate(node.lhs):
|
| 641 | lval = LeftName(lhs_val.name, lhs_val.left)
|
| 642 | self.mem.SetNamed(lval,
|
| 643 | value.Null,
|
| 644 | scope_e.LocalOnly,
|
| 645 | flags=flags)
|
| 646 | return 0
|
| 647 |
|
| 648 | right_val = self.expr_ev.EvalExpr(node.rhs, loc.Missing)
|
| 649 | lvals = None # type: List[LeftName]
|
| 650 | rhs_vals = None # type: List[value_t]
|
| 651 |
|
| 652 | num_lhs = len(node.lhs)
|
| 653 | if num_lhs == 1:
|
| 654 | lhs0 = node.lhs[0]
|
| 655 | lvals = [LeftName(lhs0.name, lhs0.left)]
|
| 656 | rhs_vals = [right_val]
|
| 657 | else:
|
| 658 | items = val_ops.ToList(
|
| 659 | right_val, 'Destructuring assignment expected List',
|
| 660 | node.keyword)
|
| 661 |
|
| 662 | num_rhs = len(items)
|
| 663 | if num_lhs != num_rhs:
|
| 664 | raise error.Expr(
|
| 665 | 'Got %d places on the left, but %d values on right' %
|
| 666 | (num_lhs, num_rhs), node.keyword)
|
| 667 |
|
| 668 | lvals = []
|
| 669 | rhs_vals = []
|
| 670 | for i, lhs_val in enumerate(node.lhs):
|
| 671 | lval = LeftName(lhs_val.name, lhs_val.left)
|
| 672 | lvals.append(lval)
|
| 673 | rhs_vals.append(items[i])
|
| 674 |
|
| 675 | for i, lval in enumerate(lvals):
|
| 676 | rval = rhs_vals[i]
|
| 677 | self.mem.SetNamed(lval, rval, scope_e.LocalOnly, flags=flags)
|
| 678 |
|
| 679 | return 0
|
| 680 |
|
| 681 | def _DoMutation(self, node):
|
| 682 | # type: (command.Mutation) -> None
|
| 683 |
|
| 684 | with switch(node.keyword.id) as case2:
|
| 685 | if case2(Id.KW_SetVar):
|
| 686 | which_scopes = scope_e.LocalOnly
|
| 687 | elif case2(Id.KW_SetGlobal):
|
| 688 | which_scopes = scope_e.GlobalOnly
|
| 689 | else:
|
| 690 | raise AssertionError(node.keyword.id)
|
| 691 |
|
| 692 | if node.op.id == Id.Arith_Equal:
|
| 693 | right_val = self.expr_ev.EvalExpr(node.rhs, loc.Missing)
|
| 694 |
|
| 695 | lvals = None # type: List[y_lvalue_t]
|
| 696 | rhs_vals = None # type: List[value_t]
|
| 697 |
|
| 698 | num_lhs = len(node.lhs)
|
| 699 | if num_lhs == 1:
|
| 700 | lvals = [self.expr_ev.EvalLhsExpr(node.lhs[0], which_scopes)]
|
| 701 | rhs_vals = [right_val]
|
| 702 | else:
|
| 703 | items = val_ops.ToList(
|
| 704 | right_val, 'Destructuring assignment expected List',
|
| 705 | node.keyword)
|
| 706 |
|
| 707 | num_rhs = len(items)
|
| 708 | if num_lhs != num_rhs:
|
| 709 | raise error.Expr(
|
| 710 | 'Got %d places on the left, but %d values on the right'
|
| 711 | % (num_lhs, num_rhs), node.keyword)
|
| 712 |
|
| 713 | lvals = []
|
| 714 | rhs_vals = []
|
| 715 | for i, lhs_val in enumerate(node.lhs):
|
| 716 | lvals.append(
|
| 717 | self.expr_ev.EvalLhsExpr(lhs_val, which_scopes))
|
| 718 | rhs_vals.append(items[i])
|
| 719 |
|
| 720 | for i, lval in enumerate(lvals):
|
| 721 | rval = rhs_vals[i]
|
| 722 |
|
| 723 | # setvar mylist[0] = 42
|
| 724 | # setvar mydict['key'] = 42
|
| 725 | UP_lval = lval
|
| 726 |
|
| 727 | if lval.tag() == y_lvalue_e.Local:
|
| 728 | lval = cast(LeftName, UP_lval)
|
| 729 |
|
| 730 | self.mem.SetNamed(lval, rval, which_scopes)
|
| 731 |
|
| 732 | elif lval.tag() == y_lvalue_e.Container:
|
| 733 | lval = cast(y_lvalue.Container, UP_lval)
|
| 734 |
|
| 735 | obj = lval.obj
|
| 736 | UP_obj = obj
|
| 737 | with tagswitch(obj) as case:
|
| 738 | if case(value_e.List):
|
| 739 | obj = cast(value.List, UP_obj)
|
| 740 | index = val_ops.ToInt(lval.index,
|
| 741 | 'List index should be Int',
|
| 742 | loc.Missing)
|
| 743 | obj.items[index] = rval
|
| 744 |
|
| 745 | elif case(value_e.Dict):
|
| 746 | obj = cast(value.Dict, UP_obj)
|
| 747 | key = val_ops.ToStr(lval.index,
|
| 748 | 'Dict index should be Str',
|
| 749 | loc.Missing)
|
| 750 | obj.d[key] = rval
|
| 751 |
|
| 752 | elif case(value_e.Obj):
|
| 753 | obj = cast(Obj, UP_obj)
|
| 754 | key = val_ops.ToStr(lval.index,
|
| 755 | 'Obj index should be Str',
|
| 756 | loc.Missing)
|
| 757 | obj.d[key] = rval
|
| 758 |
|
| 759 | else:
|
| 760 | raise error.TypeErr(
|
| 761 | obj, "obj[index] expected List, Dict, or Obj",
|
| 762 | loc.Missing)
|
| 763 |
|
| 764 | else:
|
| 765 | raise AssertionError()
|
| 766 |
|
| 767 | else:
|
| 768 | # Checked in the parser
|
| 769 | assert len(node.lhs) == 1
|
| 770 |
|
| 771 | aug_lval = self.expr_ev.EvalLhsExpr(node.lhs[0], which_scopes)
|
| 772 | val = self.expr_ev.EvalExpr(node.rhs, loc.Missing)
|
| 773 |
|
| 774 | self.expr_ev.EvalAugmented(aug_lval, val, node.op, which_scopes)
|
| 775 |
|
| 776 | def _DoSimple(self, node, cmd_st):
|
| 777 | # type: (command.Simple, CommandStatus) -> int
|
| 778 | probe('cmd_eval', '_DoSimple_enter')
|
| 779 |
|
| 780 | # PROBLEM: We want to log argv in 'xtrace' mode, but we may have already
|
| 781 | # redirected here, which screws up logging. For example, 'echo hi
|
| 782 | # >/dev/null 2>&1'. We want to evaluate argv and log it BEFORE applying
|
| 783 | # redirects.
|
| 784 |
|
| 785 | # Another problem:
|
| 786 | # - tracing can be called concurrently from multiple processes, leading
|
| 787 | # to overlap. Maybe have a mode that creates a file per process.
|
| 788 | # xtrace-proc
|
| 789 | # - line numbers for every command would be very nice. But then you have
|
| 790 | # to print the filename too.
|
| 791 |
|
| 792 | words = braces.BraceExpandWords(node.words)
|
| 793 |
|
| 794 | # Note: Individual WORDS can fail
|
| 795 | # - $() and <() can have failures. This can happen in DBracket,
|
| 796 | # DParen, etc. too
|
| 797 | # - Tracing: this can start processes for proc sub and here docs!
|
| 798 | cmd_val = self.word_ev.EvalWordSequence2(words,
|
| 799 | node.is_last_cmd,
|
| 800 | allow_assign=True)
|
| 801 |
|
| 802 | UP_cmd_val = cmd_val
|
| 803 | if UP_cmd_val.tag() == cmd_value_e.Argv:
|
| 804 | cmd_val = cast(cmd_value.Argv, UP_cmd_val)
|
| 805 |
|
| 806 | if len(cmd_val.argv): # it can be empty in rare cases
|
| 807 | self.mem.SetLastArgument(cmd_val.argv[-1])
|
| 808 | else:
|
| 809 | self.mem.SetLastArgument('')
|
| 810 |
|
| 811 | if node.typed_args or node.block: # guard to avoid allocs
|
| 812 | cmd_val.proc_args = ProcArgs(node.typed_args, None, None, None)
|
| 813 | func_proc.EvalTypedArgsToProc(self.expr_ev, self.mutable_opts,
|
| 814 | node, cmd_val.proc_args)
|
| 815 | else:
|
| 816 | if node.block:
|
| 817 | e_die("ShAssignment builtins don't accept blocks",
|
| 818 | node.block.brace_group.left)
|
| 819 | cmd_val = cast(cmd_value.Assign, UP_cmd_val)
|
| 820 |
|
| 821 | # Could reset $_ after assignment, but then we'd have to do it for
|
| 822 | # all YSH constructs too. It's easier to let it persist. Other
|
| 823 | # shells aren't consistent.
|
| 824 | # self.mem.SetLastArgument('')
|
| 825 |
|
| 826 | run_flags = executor.IS_LAST_CMD if node.is_last_cmd else 0
|
| 827 |
|
| 828 | # NOTE: RunSimpleCommand may never return
|
| 829 | if len(node.more_env): # I think this guard is necessary?
|
| 830 | is_other_special = False # TODO: There are other special builtins too!
|
| 831 | if cmd_val.tag() == cmd_value_e.Assign or is_other_special:
|
| 832 | # Special builtins have their temp env persisted.
|
| 833 | self._EvalTempEnv(node.more_env, 0)
|
| 834 | status = self._RunSimpleCommand(cmd_val, cmd_st, run_flags)
|
| 835 | else:
|
| 836 | with state.ctx_Temp(self.mem):
|
| 837 | self._EvalTempEnv(node.more_env, state.SetExport)
|
| 838 | status = self._RunSimpleCommand(cmd_val, cmd_st, run_flags)
|
| 839 | else:
|
| 840 | status = self._RunSimpleCommand(cmd_val, cmd_st, run_flags)
|
| 841 |
|
| 842 | probe('cmd_eval', '_DoSimple_exit', status)
|
| 843 | return status
|
| 844 |
|
| 845 | def _DoExpandedAlias(self, node):
|
| 846 | # type: (command.ExpandedAlias) -> int
|
| 847 | # Expanded aliases need redirects and env bindings from the calling
|
| 848 | # context, as well as redirects in the expansion!
|
| 849 |
|
| 850 | # TODO: SetTokenForLine to OUTSIDE? Don't bother with stuff inside
|
| 851 | # expansion, since aliases are discouraged.
|
| 852 |
|
| 853 | if len(node.more_env):
|
| 854 | with state.ctx_Temp(self.mem):
|
| 855 | self._EvalTempEnv(node.more_env, state.SetExport)
|
| 856 | return self._Execute(node.child)
|
| 857 | else:
|
| 858 | return self._Execute(node.child)
|
| 859 |
|
| 860 | def _DoPipeline(self, node, cmd_st):
|
| 861 | # type: (command.Pipeline, CommandStatus) -> int
|
| 862 | cmd_st.check_errexit = True
|
| 863 | for op in node.ops:
|
| 864 | if op.id != Id.Op_Pipe:
|
| 865 | e_die("|& isn't supported", op)
|
| 866 |
|
| 867 | # Remove $_ before pipeline. This matches bash, and is important in
|
| 868 | # pipelines than assignments because pipelines are non-deterministic.
|
| 869 | self.mem.SetLastArgument('')
|
| 870 |
|
| 871 | # Set status to INVALID value, because we MIGHT set cmd_st.pipe_status,
|
| 872 | # which _Execute() boils down into a status for us.
|
| 873 | status = -1
|
| 874 |
|
| 875 | if node.negated is not None:
|
| 876 | self._StrictErrExit(node)
|
| 877 | with state.ctx_ErrExit(self.mutable_opts, False, node.negated):
|
| 878 | # '! grep' is parsed as a pipeline, according to the grammar, but
|
| 879 | # there's no pipe() call.
|
| 880 | if len(node.children) == 1:
|
| 881 | tmp_status = self._Execute(node.children[0])
|
| 882 | status = 1 if tmp_status == 0 else 0
|
| 883 | else:
|
| 884 | self.shell_ex.RunPipeline(node, cmd_st)
|
| 885 | cmd_st.pipe_negated = True
|
| 886 |
|
| 887 | # errexit is disabled for !.
|
| 888 | cmd_st.check_errexit = False
|
| 889 | else:
|
| 890 | self.shell_ex.RunPipeline(node, cmd_st)
|
| 891 |
|
| 892 | return status
|
| 893 |
|
| 894 | def _DoShAssignment(self, node, cmd_st):
|
| 895 | # type: (command.ShAssignment, CommandStatus) -> int
|
| 896 | assert len(node.pairs) >= 1, node
|
| 897 |
|
| 898 | # x=y is 'neutered' inside 'proc'
|
| 899 | which_scopes = self.mem.ScopesForWriting()
|
| 900 |
|
| 901 | for pair in node.pairs:
|
| 902 | if pair.op == assign_op_e.PlusEqual:
|
| 903 | assert pair.rhs, pair.rhs # I don't think a+= is valid?
|
| 904 | rhs = self.word_ev.EvalRhsWord(pair.rhs)
|
| 905 |
|
| 906 | lval = self.arith_ev.EvalShellLhs(pair.lhs, which_scopes)
|
| 907 | # do not respect set -u
|
| 908 | old_val = sh_expr_eval.OldValue(lval, self.mem, None)
|
| 909 |
|
| 910 | val = PlusEquals(old_val, rhs)
|
| 911 |
|
| 912 | else: # plain assignment
|
| 913 | lval = self.arith_ev.EvalShellLhs(pair.lhs, which_scopes)
|
| 914 |
|
| 915 | # RHS can be a string or array.
|
| 916 | if pair.rhs:
|
| 917 | val = self.word_ev.EvalRhsWord(pair.rhs)
|
| 918 | assert isinstance(val, value_t), val
|
| 919 |
|
| 920 | else: # e.g. 'readonly x' or 'local x'
|
| 921 | val = None
|
| 922 |
|
| 923 | # NOTE: In bash and mksh, declare -a myarray makes an empty cell
|
| 924 | # with Undef value, but the 'array' attribute.
|
| 925 |
|
| 926 | flags = 0 # for tracing
|
| 927 | self.mem.SetValue(lval, val, which_scopes, flags=flags)
|
| 928 | self.tracer.OnShAssignment(lval, pair.op, val, flags, which_scopes)
|
| 929 |
|
| 930 | # PATCH to be compatible with existing shells: If the assignment had a
|
| 931 | # command sub like:
|
| 932 | #
|
| 933 | # s=$(echo one; false)
|
| 934 | #
|
| 935 | # then its status will be in mem.last_status, and we can check it here.
|
| 936 | # If there was NOT a command sub in the assignment, then we don't want to
|
| 937 | # check it.
|
| 938 |
|
| 939 | # Only do this if there was a command sub? How? Look at node?
|
| 940 | # Set a flag in mem? self.mem.last_status or
|
| 941 | if self.check_command_sub_status:
|
| 942 | last_status = self.mem.LastStatus()
|
| 943 | self._CheckStatus(last_status, cmd_st, node, loc.Missing)
|
| 944 | return last_status # A global assignment shouldn't clear $?.
|
| 945 | else:
|
| 946 | return 0
|
| 947 |
|
| 948 | def _DoExpr(self, node):
|
| 949 | # type: (command.Expr) -> int
|
| 950 |
|
| 951 | # call f(x) or = f(x)
|
| 952 | val = self.expr_ev.EvalExpr(node.e, loc.Missing)
|
| 953 |
|
| 954 | if node.keyword.id == Id.Lit_Equals: # = f(x)
|
| 955 | io_errors = [] # type: List[error.IOError_OSError]
|
| 956 | with vm.ctx_FlushStdout(io_errors):
|
| 957 | try:
|
| 958 | ui.PrettyPrintValue('', val, mylib.Stdout())
|
| 959 | except (IOError, OSError) as e:
|
| 960 | self.errfmt.PrintMessage(
|
| 961 | 'I/O error during = keyword: %s' % pyutil.strerror(e),
|
| 962 | node.keyword)
|
| 963 | return 1
|
| 964 |
|
| 965 | if len(io_errors): # e.g. disk full, ulimit
|
| 966 | self.errfmt.PrintMessage(
|
| 967 | 'I/O error during = keyword: %s' %
|
| 968 | pyutil.strerror(io_errors[0]), node.keyword)
|
| 969 | return 1
|
| 970 |
|
| 971 | return 0
|
| 972 |
|
| 973 | def _DoControlFlow(self, node):
|
| 974 | # type: (command.ControlFlow) -> int
|
| 975 | keyword = node.keyword
|
| 976 |
|
| 977 | if node.arg_word: # Evaluate the argument
|
| 978 | str_val = self.word_ev.EvalWordToString(node.arg_word)
|
| 979 |
|
| 980 | # Quirk: We need 'return $empty' to be valid for libtool. This is
|
| 981 | # another meaning of strict_control_flow, which also has to do with
|
| 982 | # break/continue at top level. It has the side effect of making
|
| 983 | # 'return ""' valid, which shells other than zsh fail on.
|
| 984 | if (len(str_val.s) == 0 and
|
| 985 | not self.exec_opts.strict_control_flow()):
|
| 986 | arg = 0
|
| 987 | else:
|
| 988 | try:
|
| 989 | arg = int(str_val.s) # all control flow takes an integer
|
| 990 | except ValueError:
|
| 991 | # Either a bad argument, or integer overflow
|
| 992 | e_die(
|
| 993 | '%r expected a small integer, got %r' %
|
| 994 | (lexer.TokenVal(keyword), str_val.s),
|
| 995 | loc.Word(node.arg_word))
|
| 996 |
|
| 997 | # C++ int() does range checking, but Python doesn't. So let's
|
| 998 | # simulate it here for spec tests.
|
| 999 | # TODO: could be mylib.ToMachineInt()? Problem: 'int' in C/C++
|
| 1000 | # could be more than 4 bytes. We are testing INT_MAX and
|
| 1001 | # INT_MIN in gc_builtins.cc - those could be hard-coded.
|
| 1002 | if mylib.PYTHON:
|
| 1003 | max_int = (1 << 31) - 1
|
| 1004 | min_int = -(1 << 31)
|
| 1005 | if not (min_int <= arg <= max_int):
|
| 1006 | e_die(
|
| 1007 | '%r expected a small integer, got %r' %
|
| 1008 | (lexer.TokenVal(keyword), str_val.s),
|
| 1009 | loc.Word(node.arg_word))
|
| 1010 | else:
|
| 1011 | if keyword.id in (Id.ControlFlow_Exit, Id.ControlFlow_Return):
|
| 1012 | arg = self.mem.LastStatus()
|
| 1013 | else:
|
| 1014 | arg = 1 # break or continue 1 level by default
|
| 1015 |
|
| 1016 | self.tracer.OnControlFlow(consts.ControlFlowName(keyword.id), arg)
|
| 1017 |
|
| 1018 | # NOTE: A top-level 'return' is OK, unlike in bash. If you can return
|
| 1019 | # from a sourced script, it makes sense to return from a main script.
|
| 1020 | if (keyword.id in (Id.ControlFlow_Break, Id.ControlFlow_Continue) and
|
| 1021 | self.loop_level == 0):
|
| 1022 | msg = 'Invalid control flow at top level'
|
| 1023 | if self.exec_opts.strict_control_flow():
|
| 1024 | e_die(msg, keyword)
|
| 1025 | else:
|
| 1026 | # Only print warnings, never fatal.
|
| 1027 | # Bash oddly only exits 1 for 'return', but no other shell does.
|
| 1028 | self.errfmt.PrefixPrint(msg, 'warning: ', keyword)
|
| 1029 | return 0
|
| 1030 |
|
| 1031 | if keyword.id == Id.ControlFlow_Exit:
|
| 1032 | # handled differently than other control flow
|
| 1033 | raise util.UserExit(arg)
|
| 1034 | else:
|
| 1035 | raise vm.IntControlFlow(keyword, arg)
|
| 1036 |
|
| 1037 | def _DoAndOr(self, node, cmd_st):
|
| 1038 | # type: (command.AndOr, CommandStatus) -> int
|
| 1039 | # NOTE: && and || have EQUAL precedence in command mode. See case #13
|
| 1040 | # in dbracket.test.sh.
|
| 1041 |
|
| 1042 | left = node.children[0]
|
| 1043 |
|
| 1044 | # Suppress failure for every child except the last one.
|
| 1045 | self._StrictErrExit(left)
|
| 1046 | with state.ctx_ErrExit(self.mutable_opts, False, node.ops[0]):
|
| 1047 | status = self._Execute(left)
|
| 1048 |
|
| 1049 | i = 1
|
| 1050 | n = len(node.children)
|
| 1051 | while i < n:
|
| 1052 | #log('i %d status %d', i, status)
|
| 1053 | child = node.children[i]
|
| 1054 | op = node.ops[i - 1]
|
| 1055 | op_id = op.id
|
| 1056 |
|
| 1057 | #log('child %s op_id %s', child, op_id)
|
| 1058 |
|
| 1059 | if op_id == Id.Op_DPipe and status == 0:
|
| 1060 | i += 1
|
| 1061 | continue # short circuit
|
| 1062 |
|
| 1063 | elif op_id == Id.Op_DAmp and status != 0:
|
| 1064 | i += 1
|
| 1065 | continue # short circuit
|
| 1066 |
|
| 1067 | if i == n - 1: # errexit handled differently for last child
|
| 1068 | status = self._Execute(child)
|
| 1069 | else:
|
| 1070 | # blame the right && or ||
|
| 1071 | self._StrictErrExit(child)
|
| 1072 | with state.ctx_ErrExit(self.mutable_opts, False, op):
|
| 1073 | status = self._Execute(child)
|
| 1074 |
|
| 1075 | i += 1
|
| 1076 |
|
| 1077 | return status
|
| 1078 |
|
| 1079 | def _DoWhileUntil(self, node):
|
| 1080 | # type: (command.WhileUntil) -> int
|
| 1081 | status = 0
|
| 1082 | with ctx_LoopLevel(self):
|
| 1083 | while True:
|
| 1084 | try:
|
| 1085 | # blame while/until spid
|
| 1086 | b = self._EvalCondition(node.cond, node.keyword)
|
| 1087 | if node.keyword.id == Id.KW_Until:
|
| 1088 | b = not b
|
| 1089 | if not b:
|
| 1090 | break
|
| 1091 | status = self._Execute(node.body) # last one wins
|
| 1092 |
|
| 1093 | except vm.IntControlFlow as e:
|
| 1094 | status = 0
|
| 1095 | action = e.HandleLoop()
|
| 1096 | if action == flow_e.Break:
|
| 1097 | break
|
| 1098 | elif action == flow_e.Raise:
|
| 1099 | raise
|
| 1100 |
|
| 1101 | return status
|
| 1102 |
|
| 1103 | def _DoForEach(self, node):
|
| 1104 | # type: (command.ForEach) -> int
|
| 1105 |
|
| 1106 | # for the 2 kinds of shell loop
|
| 1107 | iter_list = None # type: List[str]
|
| 1108 |
|
| 1109 | # for YSH loop
|
| 1110 | iter_expr = None # type: expr_t
|
| 1111 | expr_blame = None # type: loc_t
|
| 1112 |
|
| 1113 | iterable = node.iterable
|
| 1114 | UP_iterable = iterable
|
| 1115 |
|
| 1116 | with tagswitch(node.iterable) as case:
|
| 1117 | if case(for_iter_e.Args):
|
| 1118 | iter_list = self.mem.GetArgv()
|
| 1119 |
|
| 1120 | elif case(for_iter_e.Words):
|
| 1121 | iterable = cast(for_iter.Words, UP_iterable)
|
| 1122 | words = braces.BraceExpandWords(iterable.words)
|
| 1123 | iter_list = self.word_ev.EvalWordSequence(words)
|
| 1124 |
|
| 1125 | elif case(for_iter_e.YshExpr):
|
| 1126 | iterable = cast(for_iter.YshExpr, UP_iterable)
|
| 1127 | iter_expr = iterable.e
|
| 1128 | expr_blame = iterable.blame
|
| 1129 |
|
| 1130 | else:
|
| 1131 | raise AssertionError()
|
| 1132 |
|
| 1133 | n = len(node.iter_names)
|
| 1134 | assert n > 0
|
| 1135 |
|
| 1136 | i_name = None # type: Optional[LeftName]
|
| 1137 | # required
|
| 1138 | name1 = None # type: LeftName
|
| 1139 | name2 = None # type: Optional[LeftName]
|
| 1140 |
|
| 1141 | it2 = None # type: val_ops.Iterator
|
| 1142 | if iter_expr: # for_expr.YshExpr
|
| 1143 | val = self.expr_ev.EvalExpr(iter_expr, expr_blame)
|
| 1144 |
|
| 1145 | UP_val = val
|
| 1146 | with tagswitch(val) as case:
|
| 1147 | if case(value_e.List):
|
| 1148 | val = cast(value.List, UP_val)
|
| 1149 | it2 = val_ops.ListIterator(val)
|
| 1150 |
|
| 1151 | if n == 1:
|
| 1152 | name1 = location.LName(node.iter_names[0])
|
| 1153 | elif n == 2:
|
| 1154 | i_name = location.LName(node.iter_names[0])
|
| 1155 | name1 = location.LName(node.iter_names[1])
|
| 1156 | else:
|
| 1157 | # This is similar to a parse error
|
| 1158 | e_die_status(
|
| 1159 | 2,
|
| 1160 | 'List iteration expects at most 2 loop variables',
|
| 1161 | node.keyword)
|
| 1162 |
|
| 1163 | elif case(value_e.Dict):
|
| 1164 | val = cast(value.Dict, UP_val)
|
| 1165 | it2 = val_ops.DictIterator(val)
|
| 1166 |
|
| 1167 | if n == 1:
|
| 1168 | name1 = location.LName(node.iter_names[0])
|
| 1169 | elif n == 2:
|
| 1170 | name1 = location.LName(node.iter_names[0])
|
| 1171 | name2 = location.LName(node.iter_names[1])
|
| 1172 | elif n == 3:
|
| 1173 | i_name = location.LName(node.iter_names[0])
|
| 1174 | name1 = location.LName(node.iter_names[1])
|
| 1175 | name2 = location.LName(node.iter_names[2])
|
| 1176 | else:
|
| 1177 | raise AssertionError()
|
| 1178 |
|
| 1179 | elif case(value_e.Range):
|
| 1180 | val = cast(value.Range, UP_val)
|
| 1181 | it2 = val_ops.RangeIterator(val)
|
| 1182 |
|
| 1183 | if n == 1:
|
| 1184 | name1 = location.LName(node.iter_names[0])
|
| 1185 | elif n == 2:
|
| 1186 | i_name = location.LName(node.iter_names[0])
|
| 1187 | name1 = location.LName(node.iter_names[1])
|
| 1188 | else:
|
| 1189 | e_die_status(
|
| 1190 | 2,
|
| 1191 | 'Range iteration expects at most 2 loop variables',
|
| 1192 | node.keyword)
|
| 1193 |
|
| 1194 | elif case(value_e.Stdin):
|
| 1195 | # TODO: This could changed to magic iterator?
|
| 1196 | it2 = val_ops.StdinIterator(expr_blame)
|
| 1197 | if n == 1:
|
| 1198 | name1 = location.LName(node.iter_names[0])
|
| 1199 | elif n == 2:
|
| 1200 | i_name = location.LName(node.iter_names[0])
|
| 1201 | name1 = location.LName(node.iter_names[1])
|
| 1202 | else:
|
| 1203 | e_die_status(
|
| 1204 | 2,
|
| 1205 | 'Stdin iteration expects at most 2 loop variables',
|
| 1206 | node.keyword)
|
| 1207 | else:
|
| 1208 | raise error.TypeErr(
|
| 1209 | val, 'for loop expected List, Dict, Range, or Stdin',
|
| 1210 | node.keyword)
|
| 1211 |
|
| 1212 | else:
|
| 1213 | assert iter_list is not None, iter_list
|
| 1214 |
|
| 1215 | #log('iter list %s', iter_list)
|
| 1216 | it2 = val_ops.ArrayIter(iter_list)
|
| 1217 |
|
| 1218 | if n == 1:
|
| 1219 | name1 = location.LName(node.iter_names[0])
|
| 1220 | elif n == 2:
|
| 1221 | i_name = location.LName(node.iter_names[0])
|
| 1222 | name1 = location.LName(node.iter_names[1])
|
| 1223 | else:
|
| 1224 | # This is similar to a parse error
|
| 1225 | e_die_status(
|
| 1226 | 2, 'Argv iteration expects at most 2 loop variables',
|
| 1227 | node.keyword)
|
| 1228 |
|
| 1229 | status = 0 # in case we loop zero times
|
| 1230 | with ctx_LoopLevel(self):
|
| 1231 | while True:
|
| 1232 | first = it2.FirstValue()
|
| 1233 | #log('first %s', first)
|
| 1234 | if first is None: # for StdinIterator
|
| 1235 | #log('first is None')
|
| 1236 | break
|
| 1237 |
|
| 1238 | if first.tag() == value_e.Interrupted:
|
| 1239 | self.RunPendingTraps()
|
| 1240 | #log('Done running traps')
|
| 1241 | continue
|
| 1242 |
|
| 1243 | self.mem.SetLocalName(name1, first)
|
| 1244 | if name2:
|
| 1245 | self.mem.SetLocalName(name2, it2.SecondValue())
|
| 1246 | if i_name:
|
| 1247 | self.mem.SetLocalName(i_name, num.ToBig(it2.Index()))
|
| 1248 |
|
| 1249 | # increment index before handling continue, etc.
|
| 1250 | it2.Next()
|
| 1251 |
|
| 1252 | try:
|
| 1253 | status = self._Execute(node.body) # last one wins
|
| 1254 | except vm.IntControlFlow as e:
|
| 1255 | status = 0
|
| 1256 | action = e.HandleLoop()
|
| 1257 | if action == flow_e.Break:
|
| 1258 | break
|
| 1259 | elif action == flow_e.Raise:
|
| 1260 | raise
|
| 1261 |
|
| 1262 | return status
|
| 1263 |
|
| 1264 | def _DoForExpr(self, node):
|
| 1265 | # type: (command.ForExpr) -> int
|
| 1266 |
|
| 1267 | status = 0
|
| 1268 |
|
| 1269 | init = node.init
|
| 1270 | for_cond = node.cond
|
| 1271 | body = node.body
|
| 1272 | update = node.update
|
| 1273 |
|
| 1274 | self.arith_ev.Eval(init)
|
| 1275 | with ctx_LoopLevel(self):
|
| 1276 | while True:
|
| 1277 | # We only accept integers as conditions
|
| 1278 | cond_int = self.arith_ev.EvalToBigInt(for_cond)
|
| 1279 | if mops.Equal(cond_int, mops.ZERO): # false
|
| 1280 | break
|
| 1281 |
|
| 1282 | try:
|
| 1283 | status = self._Execute(body)
|
| 1284 | except vm.IntControlFlow as e:
|
| 1285 | status = 0
|
| 1286 | action = e.HandleLoop()
|
| 1287 | if action == flow_e.Break:
|
| 1288 | break
|
| 1289 | elif action == flow_e.Raise:
|
| 1290 | raise
|
| 1291 |
|
| 1292 | self.arith_ev.Eval(update)
|
| 1293 |
|
| 1294 | return status
|
| 1295 |
|
| 1296 | def _DoShFunction(self, node):
|
| 1297 | # type: (command.ShFunction) -> None
|
| 1298 | existing, _ = self.procs.GetInvokable(node.name)
|
| 1299 | if existing and not self.exec_opts.redefine_proc_func():
|
| 1300 | e_die(
|
| 1301 | "Function %s was already defined (redefine_proc_func)" %
|
| 1302 | node.name, node.name_tok)
|
| 1303 |
|
| 1304 | # Note: shell functions can read vars from the file they're defined in
|
| 1305 | # But they don't appear in the module itself -- rather it is __sh_funcs__
|
| 1306 | # Though we could consider disallowing them though on 'import'.
|
| 1307 | sh_func = value.Proc(node.name, node.name_tok, proc_sig.Open,
|
| 1308 | node.body, None, True, self.mem.GlobalFrame())
|
| 1309 | self.procs.DefineShellFunc(node.name, sh_func)
|
| 1310 |
|
| 1311 | def _DoProc(self, node):
|
| 1312 | # type: (Proc) -> None
|
| 1313 | proc_name = lexer.TokenVal(node.name)
|
| 1314 |
|
| 1315 | # Note: this is similar 'const x = 42' and redefine_const -- it's a
|
| 1316 | # dynamic check that it doesn't already exist
|
| 1317 | # Also modules make this less necessary, because there are fewer name
|
| 1318 | # conflicts
|
| 1319 | # We could also define procs as READ-ONLY, but that means we need
|
| 1320 | # Dict[str, Cell] and not Dict[str, value_t]
|
| 1321 | existing, _ = self.procs.GetInvokable(proc_name)
|
| 1322 | if existing and not self.exec_opts.redefine_proc_func():
|
| 1323 | e_die(
|
| 1324 | "Proc %s was already defined (redefine_proc_func)" % proc_name,
|
| 1325 | node.name)
|
| 1326 |
|
| 1327 | if node.sig.tag() == proc_sig_e.Closed:
|
| 1328 | sig = cast(proc_sig.Closed, node.sig)
|
| 1329 | proc_defaults = func_proc.EvalProcDefaults(self.expr_ev, sig)
|
| 1330 | else:
|
| 1331 | proc_defaults = None
|
| 1332 |
|
| 1333 | # no dynamic scope
|
| 1334 | proc = value.Proc(proc_name, node.name, node.sig, node.body,
|
| 1335 | proc_defaults, False, self.mem.GlobalFrame())
|
| 1336 | self.procs.DefineProc(proc_name, proc)
|
| 1337 |
|
| 1338 | def _DoFunc(self, node):
|
| 1339 | # type: (Func) -> None
|
| 1340 | name = lexer.TokenVal(node.name)
|
| 1341 | lval = location.LName(name)
|
| 1342 |
|
| 1343 | # Check that we haven't already defined a function
|
| 1344 | cell = self.mem.GetCell(name, scope_e.LocalOnly)
|
| 1345 | if cell and cell.val.tag() == value_e.Func:
|
| 1346 | if self.exec_opts.redefine_proc_func():
|
| 1347 | cell.readonly = False # Ensure we can unset the value
|
| 1348 | did_unset = self.mem.Unset(lval, scope_e.LocalOnly)
|
| 1349 | assert did_unset, name
|
| 1350 | else:
|
| 1351 | e_die(
|
| 1352 | "Func %s was already defined (redefine_proc_func)" % name,
|
| 1353 | node.name)
|
| 1354 |
|
| 1355 | pos_defaults, named_defaults = func_proc.EvalFuncDefaults(
|
| 1356 | self.expr_ev, node)
|
| 1357 | func_val = value.Func(name, node, pos_defaults, named_defaults,
|
| 1358 | self.mem.GlobalFrame())
|
| 1359 |
|
| 1360 | self.mem.SetNamed(lval,
|
| 1361 | func_val,
|
| 1362 | scope_e.LocalOnly,
|
| 1363 | flags=state.SetReadOnly)
|
| 1364 |
|
| 1365 | def _DoIf(self, node):
|
| 1366 | # type: (command.If) -> int
|
| 1367 | status = -1
|
| 1368 |
|
| 1369 | done = False
|
| 1370 | for if_arm in node.arms:
|
| 1371 | b = self._EvalCondition(if_arm.cond, if_arm.keyword)
|
| 1372 | if b:
|
| 1373 | status = self._ExecuteList(if_arm.action)
|
| 1374 | done = True
|
| 1375 | break
|
| 1376 |
|
| 1377 | if not done and node.else_action is not None:
|
| 1378 | status = self._ExecuteList(node.else_action)
|
| 1379 |
|
| 1380 | assert status != -1, 'Should have been initialized'
|
| 1381 | return status
|
| 1382 |
|
| 1383 | def _DoCase(self, node):
|
| 1384 | # type: (command.Case) -> int
|
| 1385 |
|
| 1386 | to_match = self._EvalCaseArg(node.to_match, node.case_kw)
|
| 1387 | fnmatch_flags = FNM_CASEFOLD if self.exec_opts.nocasematch() else 0
|
| 1388 |
|
| 1389 | status = 0 # If there are no arms, it should be zero?
|
| 1390 |
|
| 1391 | done = False # Should we try the next arm?
|
| 1392 |
|
| 1393 | # For &; terminator - not just case fallthrough, but IGNORE the condition!
|
| 1394 | ignore_next_cond = False
|
| 1395 |
|
| 1396 | for case_arm in node.arms:
|
| 1397 | with tagswitch(case_arm.pattern) as case:
|
| 1398 | if case(pat_e.Words):
|
| 1399 | if to_match.tag() != value_e.Str:
|
| 1400 | continue # A non-string `to_match` will never match a pat.Words
|
| 1401 | to_match_str = cast(value.Str, to_match)
|
| 1402 |
|
| 1403 | pat_words = cast(pat.Words, case_arm.pattern)
|
| 1404 |
|
| 1405 | this_arm_matches = False
|
| 1406 | if ignore_next_cond: # Special handling for ;&
|
| 1407 | this_arm_matches = True
|
| 1408 | ignore_next_cond = False
|
| 1409 | else:
|
| 1410 | for pat_word in pat_words.words:
|
| 1411 | word_val = self.word_ev.EvalWordToString(
|
| 1412 | pat_word, word_eval.QUOTE_FNMATCH)
|
| 1413 |
|
| 1414 | if libc.fnmatch(word_val.s, to_match_str.s,
|
| 1415 | fnmatch_flags):
|
| 1416 | this_arm_matches = True
|
| 1417 | break # Stop at first pattern
|
| 1418 |
|
| 1419 | if this_arm_matches:
|
| 1420 | status = self._ExecuteList(case_arm.action)
|
| 1421 | done = True
|
| 1422 |
|
| 1423 | # ;& and ;;& only apply to shell-style case
|
| 1424 | if case_arm.right:
|
| 1425 | id_ = case_arm.right.id
|
| 1426 | if id_ == Id.Op_SemiAmp:
|
| 1427 | # very weird semantic
|
| 1428 | ignore_next_cond = True
|
| 1429 | done = False
|
| 1430 | elif id_ == Id.Op_DSemiAmp:
|
| 1431 | # Keep going until next pattern
|
| 1432 | done = False
|
| 1433 |
|
| 1434 | elif case(pat_e.YshExprs):
|
| 1435 | pat_exprs = cast(pat.YshExprs, case_arm.pattern)
|
| 1436 |
|
| 1437 | for pat_expr in pat_exprs.exprs:
|
| 1438 | expr_val = self.expr_ev.EvalExpr(
|
| 1439 | pat_expr, case_arm.left)
|
| 1440 |
|
| 1441 | if val_ops.ExactlyEqual(expr_val, to_match,
|
| 1442 | case_arm.left):
|
| 1443 | status = self._ExecuteList(case_arm.action)
|
| 1444 | done = True
|
| 1445 | break
|
| 1446 |
|
| 1447 | elif case(pat_e.Eggex):
|
| 1448 | eggex = cast(Eggex, case_arm.pattern)
|
| 1449 | eggex_val = self.expr_ev.EvalEggex(eggex)
|
| 1450 |
|
| 1451 | if val_ops.MatchRegex(to_match, eggex_val, self.mem):
|
| 1452 | status = self._ExecuteList(case_arm.action)
|
| 1453 | done = True
|
| 1454 | break
|
| 1455 |
|
| 1456 | elif case(pat_e.Else):
|
| 1457 | status = self._ExecuteList(case_arm.action)
|
| 1458 | done = True
|
| 1459 | break
|
| 1460 |
|
| 1461 | else:
|
| 1462 | raise AssertionError()
|
| 1463 |
|
| 1464 | if done: # first match wins
|
| 1465 | break
|
| 1466 |
|
| 1467 | return status
|
| 1468 |
|
| 1469 | def _DoTimeBlock(self, node):
|
| 1470 | # type: (command.TimeBlock) -> int
|
| 1471 | # TODO:
|
| 1472 | # - When do we need RUSAGE_CHILDREN?
|
| 1473 | # - Respect TIMEFORMAT environment variable.
|
| 1474 | # "If this variable is not set, Bash acts as if it had the value"
|
| 1475 | # $'\nreal\t%3lR\nuser\t%3lU\nsys\t%3lS'
|
| 1476 | # "A trailing newline is added when the format string is displayed."
|
| 1477 |
|
| 1478 | s_real, s_user, s_sys = pyos.Time()
|
| 1479 | status = self._Execute(node.pipeline)
|
| 1480 | e_real, e_user, e_sys = pyos.Time()
|
| 1481 | # note: mycpp doesn't support %.3f
|
| 1482 | libc.print_time(e_real - s_real, e_user - s_user, e_sys - s_sys)
|
| 1483 |
|
| 1484 | return status
|
| 1485 |
|
| 1486 | def _DoRedirect(self, node, cmd_st):
|
| 1487 | # type: (command.Redirect, CommandStatus) -> int
|
| 1488 |
|
| 1489 | status = 0
|
| 1490 | redirects = [] # type: List[RedirValue]
|
| 1491 |
|
| 1492 | try:
|
| 1493 | for redir in node.redirects:
|
| 1494 | redirects.append(self._EvalRedirect(redir))
|
| 1495 | except error.RedirectEval as e:
|
| 1496 | self.errfmt.PrettyPrintError(e)
|
| 1497 | redirects = None
|
| 1498 | except error.FailGlob as e: # e.g. echo hi > foo-*
|
| 1499 | if not e.HasLocation():
|
| 1500 | e.location = self.mem.GetFallbackLocation()
|
| 1501 | self.errfmt.PrettyPrintError(e, prefix='failglob: ')
|
| 1502 | redirects = None
|
| 1503 |
|
| 1504 | if redirects is None:
|
| 1505 | # Error evaluating redirect words
|
| 1506 | status = 1
|
| 1507 |
|
| 1508 | # Translation fix: redirect I/O errors may happen in a C++
|
| 1509 | # destructor ~vm::ctx_Redirect, which means they must be signaled
|
| 1510 | # by out params, not exceptions.
|
| 1511 | io_errors = [] # type: List[error.IOError_OSError]
|
| 1512 |
|
| 1513 | # If we evaluated redirects, apply/push them
|
| 1514 | if status == 0:
|
| 1515 | self.shell_ex.PushRedirects(redirects, io_errors)
|
| 1516 | if len(io_errors):
|
| 1517 | # core/process.py prints cryptic errors, so we repeat them
|
| 1518 | # here. e.g. Bad File Descriptor
|
| 1519 | self.errfmt.PrintMessage(
|
| 1520 | 'I/O error applying redirect: %s' %
|
| 1521 | pyutil.strerror(io_errors[0]),
|
| 1522 | self.mem.GetFallbackLocation())
|
| 1523 | status = 1
|
| 1524 |
|
| 1525 | # If we applied redirects successfully, run the command_t, and pop
|
| 1526 | # them.
|
| 1527 | if status == 0:
|
| 1528 | with vm.ctx_Redirect(self.shell_ex, len(redirects), io_errors):
|
| 1529 | status = self._Execute(node.child)
|
| 1530 | if len(io_errors):
|
| 1531 | # It would be better to point to the right redirect
|
| 1532 | # operator, but we don't track it specifically
|
| 1533 | e_die("Fatal error popping redirect: %s" %
|
| 1534 | pyutil.strerror(io_errors[0]))
|
| 1535 |
|
| 1536 | return status
|
| 1537 |
|
| 1538 | def _LeafTick(self):
|
| 1539 | # type: () -> None
|
| 1540 | """Do periodic work while executing shell.
|
| 1541 |
|
| 1542 | We may run traps, check for Ctrl-C, or garbage collect.
|
| 1543 | """
|
| 1544 | # TODO: Do this in "leaf" nodes? SimpleCommand, DBracket, DParen should
|
| 1545 | # call self.DoTick()? That will RunPendingTraps and check the Ctrl-C flag,
|
| 1546 | # and maybe throw an exception.
|
| 1547 | self.RunPendingTraps()
|
| 1548 | if self.signal_safe.PollUntrappedSigInt():
|
| 1549 | raise KeyboardInterrupt()
|
| 1550 |
|
| 1551 | # TODO: Does this mess up control flow analysis? If so, we can move it
|
| 1552 | # back to the top of _Execute(), so there are fewer conditionals
|
| 1553 | # involved. This function gets called in SOME branches of
|
| 1554 | # self._Dispatch().
|
| 1555 |
|
| 1556 | # Manual GC point before every statement
|
| 1557 | mylib.MaybeCollect()
|
| 1558 |
|
| 1559 | def _Dispatch(self, node, cmd_st):
|
| 1560 | # type: (command_t, CommandStatus) -> int
|
| 1561 | """Switch on the command_t variants and execute them."""
|
| 1562 |
|
| 1563 | # If we call RunCommandSub in a recursive call to the executor, this will
|
| 1564 | # be set true (if strict_errexit is false). But it only lasts for one
|
| 1565 | # command.
|
| 1566 | probe('cmd_eval', '_Dispatch', node.tag())
|
| 1567 | self.check_command_sub_status = False
|
| 1568 |
|
| 1569 | UP_node = node
|
| 1570 | with tagswitch(node) as case:
|
| 1571 | if case(command_e.Simple): # LEAF command
|
| 1572 | node = cast(command.Simple, UP_node)
|
| 1573 |
|
| 1574 | # for $LINENO, e.g. PS4='+$SOURCE_NAME:$LINENO:'
|
| 1575 | # Note that for '> $LINENO' the location token is set in _EvalRedirect.
|
| 1576 | # TODO: blame_tok should always be set.
|
| 1577 | if node.blame_tok is not None:
|
| 1578 | self.mem.SetTokenForLine(node.blame_tok)
|
| 1579 |
|
| 1580 | self._MaybeRunDebugTrap()
|
| 1581 | cmd_st.check_errexit = True
|
| 1582 | status = self._DoSimple(node, cmd_st)
|
| 1583 | self._LeafTick()
|
| 1584 |
|
| 1585 | elif case(command_e.ShAssignment): # LEAF command
|
| 1586 | node = cast(command.ShAssignment, UP_node)
|
| 1587 |
|
| 1588 | self.mem.SetTokenForLine(node.pairs[0].left)
|
| 1589 | self._MaybeRunDebugTrap()
|
| 1590 |
|
| 1591 | # Only unqualified assignment a=b
|
| 1592 | status = self._DoShAssignment(node, cmd_st)
|
| 1593 | self._LeafTick()
|
| 1594 |
|
| 1595 | elif case(command_e.Sentence): # NOT leaf, but put it up front
|
| 1596 | node = cast(command.Sentence, UP_node)
|
| 1597 |
|
| 1598 | # Don't check_errexit since this isn't a leaf command
|
| 1599 | if node.terminator.id == Id.Op_Semi:
|
| 1600 | status = self._Execute(node.child)
|
| 1601 | else:
|
| 1602 | status = self.shell_ex.RunBackgroundJob(node.child)
|
| 1603 |
|
| 1604 | elif case(command_e.DBracket): # LEAF command
|
| 1605 | node = cast(command.DBracket, UP_node)
|
| 1606 |
|
| 1607 | self.mem.SetTokenForLine(node.left)
|
| 1608 | self._MaybeRunDebugTrap()
|
| 1609 |
|
| 1610 | self.tracer.PrintSourceCode(node.left, node.right, self.arena)
|
| 1611 |
|
| 1612 | cmd_st.check_errexit = True
|
| 1613 | cmd_st.show_code = True # this is a "leaf" for errors
|
| 1614 | result = self.bool_ev.EvalB(node.expr)
|
| 1615 | status = 0 if result else 1
|
| 1616 | self._LeafTick()
|
| 1617 |
|
| 1618 | elif case(command_e.DParen): # LEAF command
|
| 1619 | node = cast(command.DParen, UP_node)
|
| 1620 |
|
| 1621 | self.mem.SetTokenForLine(node.left)
|
| 1622 | self._MaybeRunDebugTrap()
|
| 1623 |
|
| 1624 | self.tracer.PrintSourceCode(node.left, node.right, self.arena)
|
| 1625 |
|
| 1626 | cmd_st.check_errexit = True
|
| 1627 | cmd_st.show_code = True # this is a "leaf" for errors
|
| 1628 | i = self.arith_ev.EvalToBigInt(node.child)
|
| 1629 | status = 1 if mops.Equal(i, mops.ZERO) else 0
|
| 1630 | self._LeafTick()
|
| 1631 |
|
| 1632 | elif case(command_e.ControlFlow): # LEAF command
|
| 1633 | node = cast(command.ControlFlow, UP_node)
|
| 1634 |
|
| 1635 | self.mem.SetTokenForLine(node.keyword)
|
| 1636 | self._MaybeRunDebugTrap()
|
| 1637 |
|
| 1638 | status = self._DoControlFlow(node)
|
| 1639 | # Omit _LeafTick() since we likely raise an exception above
|
| 1640 |
|
| 1641 | elif case(command_e.NoOp): # LEAF
|
| 1642 | status = 0 # make it true
|
| 1643 |
|
| 1644 | elif case(command_e.VarDecl): # YSH LEAF command
|
| 1645 | node = cast(command.VarDecl, UP_node)
|
| 1646 |
|
| 1647 | # Point to var name (bare assignment has no keyword)
|
| 1648 | self.mem.SetTokenForLine(node.lhs[0].left)
|
| 1649 | status = self._DoVarDecl(node)
|
| 1650 | self._LeafTick()
|
| 1651 |
|
| 1652 | elif case(command_e.Mutation): # YSH LEAF command
|
| 1653 | node = cast(command.Mutation, UP_node)
|
| 1654 |
|
| 1655 | self.mem.SetTokenForLine(node.keyword) # point to setvar/set
|
| 1656 | self._DoMutation(node)
|
| 1657 | status = 0 # if no exception is thrown, it succeeds
|
| 1658 | self._LeafTick()
|
| 1659 |
|
| 1660 | elif case(command_e.Expr): # YSH LEAF command
|
| 1661 | node = cast(command.Expr, UP_node)
|
| 1662 |
|
| 1663 | self.mem.SetTokenForLine(node.keyword)
|
| 1664 | # YSH debug trap?
|
| 1665 |
|
| 1666 | status = self._DoExpr(node)
|
| 1667 | self._LeafTick()
|
| 1668 |
|
| 1669 | elif case(command_e.Retval): # YSH LEAF command
|
| 1670 | node = cast(command.Retval, UP_node)
|
| 1671 |
|
| 1672 | self.mem.SetTokenForLine(node.keyword)
|
| 1673 | # YSH debug trap? I think we don't want the debug trap in func
|
| 1674 | # dialect, for speed?
|
| 1675 |
|
| 1676 | val = self.expr_ev.EvalExpr(node.val, node.keyword)
|
| 1677 | self._LeafTick()
|
| 1678 |
|
| 1679 | raise vm.ValueControlFlow(node.keyword, val)
|
| 1680 |
|
| 1681 | #
|
| 1682 | # More commands that involve recursive calls
|
| 1683 | #
|
| 1684 |
|
| 1685 | elif case(command_e.ExpandedAlias):
|
| 1686 | node = cast(command.ExpandedAlias, UP_node)
|
| 1687 | status = self._DoExpandedAlias(node)
|
| 1688 |
|
| 1689 | # Note CommandList and DoGroup have no redirects, but BraceGroup does.
|
| 1690 | # DoGroup has 'do' and 'done' spids for translation.
|
| 1691 | elif case(command_e.CommandList):
|
| 1692 | node = cast(command.CommandList, UP_node)
|
| 1693 | status = self._ExecuteList(node.children)
|
| 1694 |
|
| 1695 | elif case(command_e.DoGroup):
|
| 1696 | node = cast(command.DoGroup, UP_node)
|
| 1697 | status = self._ExecuteList(node.children)
|
| 1698 |
|
| 1699 | elif case(command_e.BraceGroup):
|
| 1700 | node = cast(BraceGroup, UP_node)
|
| 1701 | status = self._ExecuteList(node.children)
|
| 1702 |
|
| 1703 | elif case(command_e.AndOr):
|
| 1704 | node = cast(command.AndOr, UP_node)
|
| 1705 | status = self._DoAndOr(node, cmd_st)
|
| 1706 |
|
| 1707 | elif case(command_e.If):
|
| 1708 | node = cast(command.If, UP_node)
|
| 1709 |
|
| 1710 | # No SetTokenForLine() because
|
| 1711 | # - $LINENO can't appear directly in 'if'
|
| 1712 | # - 'if' doesn't directly cause errors
|
| 1713 | # It will be taken care of by command.Simple, condition, etc.
|
| 1714 | status = self._DoIf(node)
|
| 1715 |
|
| 1716 | elif case(command_e.Case):
|
| 1717 | node = cast(command.Case, UP_node)
|
| 1718 |
|
| 1719 | # Must set location for 'case $LINENO'
|
| 1720 | self.mem.SetTokenForLine(node.case_kw)
|
| 1721 | self._MaybeRunDebugTrap()
|
| 1722 | status = self._DoCase(node)
|
| 1723 |
|
| 1724 | elif case(command_e.WhileUntil):
|
| 1725 | node = cast(command.WhileUntil, UP_node)
|
| 1726 |
|
| 1727 | self.mem.SetTokenForLine(node.keyword)
|
| 1728 | status = self._DoWhileUntil(node)
|
| 1729 |
|
| 1730 | elif case(command_e.ForEach):
|
| 1731 | node = cast(command.ForEach, UP_node)
|
| 1732 |
|
| 1733 | self.mem.SetTokenForLine(node.keyword)
|
| 1734 | status = self._DoForEach(node)
|
| 1735 |
|
| 1736 | elif case(command_e.ForExpr):
|
| 1737 | node = cast(command.ForExpr, UP_node)
|
| 1738 |
|
| 1739 | self.mem.SetTokenForLine(node.keyword) # for x in $LINENO
|
| 1740 | status = self._DoForExpr(node)
|
| 1741 |
|
| 1742 | elif case(command_e.Redirect):
|
| 1743 | node = cast(command.Redirect, UP_node)
|
| 1744 |
|
| 1745 | # set -e affects redirect error, like mksh and bash 5.2, but unlike
|
| 1746 | # dash/ash
|
| 1747 | cmd_st.check_errexit = True
|
| 1748 | status = self._DoRedirect(node, cmd_st)
|
| 1749 |
|
| 1750 | elif case(command_e.Pipeline):
|
| 1751 | node = cast(command.Pipeline, UP_node)
|
| 1752 | status = self._DoPipeline(node, cmd_st)
|
| 1753 |
|
| 1754 | elif case(command_e.Subshell):
|
| 1755 | node = cast(command.Subshell, UP_node)
|
| 1756 |
|
| 1757 | # This is a leaf from the parent process POV
|
| 1758 | cmd_st.check_errexit = True
|
| 1759 |
|
| 1760 | if node.is_last_cmd:
|
| 1761 | # If the subshell is the last command in the process, just
|
| 1762 | # run it in this process. See _MarkLastCommands().
|
| 1763 | status = self._Execute(node.child)
|
| 1764 | else:
|
| 1765 | status = self.shell_ex.RunSubshell(node.child)
|
| 1766 |
|
| 1767 | elif case(command_e.ShFunction):
|
| 1768 | node = cast(command.ShFunction, UP_node)
|
| 1769 | self._DoShFunction(node)
|
| 1770 | status = 0
|
| 1771 |
|
| 1772 | elif case(command_e.Proc):
|
| 1773 | node = cast(Proc, UP_node)
|
| 1774 | self._DoProc(node)
|
| 1775 | status = 0
|
| 1776 |
|
| 1777 | elif case(command_e.Func):
|
| 1778 | node = cast(Func, UP_node)
|
| 1779 |
|
| 1780 | # Needed for error, when the func is an existing variable name
|
| 1781 | self.mem.SetTokenForLine(node.name)
|
| 1782 |
|
| 1783 | self._DoFunc(node)
|
| 1784 | status = 0
|
| 1785 |
|
| 1786 | elif case(command_e.TimeBlock):
|
| 1787 | node = cast(command.TimeBlock, UP_node)
|
| 1788 | status = self._DoTimeBlock(node)
|
| 1789 |
|
| 1790 | else:
|
| 1791 | raise NotImplementedError(node.tag())
|
| 1792 |
|
| 1793 | # Return to caller. Note the only case that didn't set it was Pipeline,
|
| 1794 | # which set cmd_st.pipe_status.
|
| 1795 | return status
|
| 1796 |
|
| 1797 | def RunPendingTraps(self):
|
| 1798 | # type: () -> None
|
| 1799 |
|
| 1800 | trap_nodes = self.trap_state.GetPendingTraps()
|
| 1801 | if trap_nodes is not None:
|
| 1802 | with state.ctx_Option(self.mutable_opts, [option_i._running_trap],
|
| 1803 | True):
|
| 1804 | for trap_node in trap_nodes:
|
| 1805 | with state.ctx_Registers(self.mem):
|
| 1806 | # TODO: show trap kind in trace
|
| 1807 | with dev.ctx_Tracer(self.tracer, 'trap', None):
|
| 1808 | # Note: exit status is lost
|
| 1809 | self._Execute(trap_node)
|
| 1810 |
|
| 1811 | def RunPendingTrapsAndCatch(self):
|
| 1812 | # type: () -> None
|
| 1813 | """
|
| 1814 | Like the above, but calls ExecuteAndCatch(), which may raise util.UserExit
|
| 1815 | """
|
| 1816 | trap_nodes = self.trap_state.GetPendingTraps()
|
| 1817 | if trap_nodes is not None:
|
| 1818 | with state.ctx_Option(self.mutable_opts, [option_i._running_trap],
|
| 1819 | True):
|
| 1820 | for trap_node in trap_nodes:
|
| 1821 | with state.ctx_Registers(self.mem):
|
| 1822 | # TODO: show trap kind in trace
|
| 1823 | with dev.ctx_Tracer(self.tracer, 'trap', None):
|
| 1824 | # Note: exit status is lost
|
| 1825 | try:
|
| 1826 | self.ExecuteAndCatch(trap_node, 0)
|
| 1827 | except util.UserExit:
|
| 1828 | # If user calls 'exit', stop running traps, but
|
| 1829 | # we still run the EXIT trap later.
|
| 1830 | break
|
| 1831 |
|
| 1832 | def _Execute(self, node):
|
| 1833 | # type: (command_t) -> int
|
| 1834 | """Call _Dispatch(), and perform the errexit check."""
|
| 1835 |
|
| 1836 | # Optimization: These 2 records have rarely-used lists, so we don't pass
|
| 1837 | # alloc_lists=True. We create them on demand.
|
| 1838 | cmd_st = CommandStatus.CreateNull()
|
| 1839 | if len(self.status_array_pool):
|
| 1840 | # Optimized to avoid allocs
|
| 1841 | process_sub_st = self.status_array_pool.pop()
|
| 1842 | else:
|
| 1843 | process_sub_st = StatusArray.CreateNull()
|
| 1844 |
|
| 1845 | with vm.ctx_ProcessSub(self.shell_ex, process_sub_st): # for wait()
|
| 1846 | try:
|
| 1847 | status = self._Dispatch(node, cmd_st)
|
| 1848 | except error.FailGlob as e:
|
| 1849 | if not e.HasLocation(): # Last resort!
|
| 1850 | e.location = self.mem.GetFallbackLocation()
|
| 1851 | self.errfmt.PrettyPrintError(e, prefix='failglob: ')
|
| 1852 | status = 1 # another redirect word eval error
|
| 1853 | cmd_st.check_errexit = True # failglob + errexit
|
| 1854 |
|
| 1855 | # Now we've waited for process subs
|
| 1856 |
|
| 1857 | # If it was a real pipeline, compute status from ${PIPESTATUS[@]} aka
|
| 1858 | # @_pipeline_status
|
| 1859 | pipe_status = cmd_st.pipe_status
|
| 1860 | # Note: bash/mksh set PIPESTATUS set even on non-pipelines. This
|
| 1861 | # makes it annoying to check both _process_sub_status and
|
| 1862 | # _pipeline_status
|
| 1863 |
|
| 1864 | errexit_loc = loc.Missing # type: loc_t
|
| 1865 | if pipe_status is not None:
|
| 1866 | # Tricky: _DoPipeline sets cmt_st.pipe_status and returns -1
|
| 1867 | # for a REAL pipeline (but not singleton pipelines)
|
| 1868 | assert status == -1, (
|
| 1869 | "Shouldn't have redir errors when PIPESTATUS (status = %d)" %
|
| 1870 | status)
|
| 1871 |
|
| 1872 | self.mem.SetPipeStatus(pipe_status)
|
| 1873 |
|
| 1874 | if self.exec_opts.pipefail():
|
| 1875 | # The status is that of the last command that is non-zero.
|
| 1876 | status = 0
|
| 1877 | for i, st in enumerate(pipe_status):
|
| 1878 | if st != 0:
|
| 1879 | status = st
|
| 1880 | errexit_loc = cmd_st.pipe_locs[i]
|
| 1881 | else:
|
| 1882 | # The status is that of last command, period.
|
| 1883 | status = pipe_status[-1]
|
| 1884 |
|
| 1885 | if cmd_st.pipe_negated:
|
| 1886 | status = 1 if status == 0 else 0
|
| 1887 |
|
| 1888 | # Compute status from _process_sub_status
|
| 1889 | if process_sub_st.codes is None:
|
| 1890 | # Optimized to avoid allocs
|
| 1891 | self.status_array_pool.append(process_sub_st)
|
| 1892 | else:
|
| 1893 | codes = process_sub_st.codes
|
| 1894 | self.mem.SetProcessSubStatus(codes)
|
| 1895 | if status == 0 and self.exec_opts.process_sub_fail():
|
| 1896 | # Choose the LAST non-zero status, consistent with pipefail above.
|
| 1897 | for i, st in enumerate(codes):
|
| 1898 | if st != 0:
|
| 1899 | status = st
|
| 1900 | errexit_loc = process_sub_st.locs[i]
|
| 1901 |
|
| 1902 | self.mem.SetLastStatus(status)
|
| 1903 |
|
| 1904 | # NOTE: Bash says that 'set -e' checking is done after each 'pipeline'.
|
| 1905 | # However, any bash construct can appear in a pipeline. So it's easier
|
| 1906 | # just to put it at the end, instead of after every node.
|
| 1907 | #
|
| 1908 | # Possible exceptions:
|
| 1909 | # - function def (however this always exits 0 anyway)
|
| 1910 | # - assignment - its result should be the result of the RHS?
|
| 1911 | # - e.g. arith sub, command sub? I don't want arith sub.
|
| 1912 | # - ControlFlow: always raises, it has no status.
|
| 1913 | if cmd_st.check_errexit:
|
| 1914 | #log('cmd_st %s', cmd_st)
|
| 1915 | self._CheckStatus(status, cmd_st, node, errexit_loc)
|
| 1916 |
|
| 1917 | return status
|
| 1918 |
|
| 1919 | def _ExecuteList(self, children):
|
| 1920 | # type: (List[command_t]) -> int
|
| 1921 | status = 0 # for empty list
|
| 1922 | for child in children:
|
| 1923 | # last status wins
|
| 1924 | status = self._Execute(child)
|
| 1925 | return status
|
| 1926 |
|
| 1927 | def LastStatus(self):
|
| 1928 | # type: () -> int
|
| 1929 | """For main_loop.py to determine the exit code of the shell itself."""
|
| 1930 | return self.mem.LastStatus()
|
| 1931 |
|
| 1932 | def _MarkLastCommands(self, node):
|
| 1933 | # type: (command_t) -> None
|
| 1934 |
|
| 1935 | if 0:
|
| 1936 | log('optimizing')
|
| 1937 | node.PrettyPrint(sys.stderr)
|
| 1938 | log('')
|
| 1939 |
|
| 1940 | UP_node = node
|
| 1941 | with tagswitch(node) as case:
|
| 1942 | if case(command_e.Simple):
|
| 1943 | node = cast(command.Simple, UP_node)
|
| 1944 | node.is_last_cmd = True
|
| 1945 | if 0:
|
| 1946 | log('Simple optimized')
|
| 1947 |
|
| 1948 | elif case(command_e.Subshell):
|
| 1949 | node = cast(command.Subshell, UP_node)
|
| 1950 | # Mark ourselves as the last
|
| 1951 | node.is_last_cmd = True
|
| 1952 |
|
| 1953 | # Also mark 'date' as the last one
|
| 1954 | # echo 1; (echo 2; date)
|
| 1955 | self._MarkLastCommands(node.child)
|
| 1956 |
|
| 1957 | elif case(command_e.Pipeline):
|
| 1958 | node = cast(command.Pipeline, UP_node)
|
| 1959 | # Bug fix: if we change the status, we can't exec the last
|
| 1960 | # element!
|
| 1961 | if node.negated is None and not self.exec_opts.pipefail():
|
| 1962 | self._MarkLastCommands(node.children[-1])
|
| 1963 |
|
| 1964 | elif case(command_e.Sentence):
|
| 1965 | node = cast(command.Sentence, UP_node)
|
| 1966 | self._MarkLastCommands(node.child)
|
| 1967 |
|
| 1968 | elif case(command_e.Redirect):
|
| 1969 | node = cast(command.Sentence, UP_node)
|
| 1970 | # Don't need to restore the redirect in any of these cases:
|
| 1971 |
|
| 1972 | # bin/osh -c 'echo hi 2>stderr'
|
| 1973 | # bin/osh -c '{ echo hi; date; } 2>stderr'
|
| 1974 | # echo hi 2>stderr | wc -l
|
| 1975 |
|
| 1976 | self._MarkLastCommands(node.child)
|
| 1977 |
|
| 1978 | elif case(command_e.CommandList):
|
| 1979 | # Subshells often have a CommandList child
|
| 1980 | node = cast(command.CommandList, UP_node)
|
| 1981 | self._MarkLastCommands(node.children[-1])
|
| 1982 |
|
| 1983 | elif case(command_e.BraceGroup):
|
| 1984 | # TODO: What about redirects?
|
| 1985 | node = cast(BraceGroup, UP_node)
|
| 1986 | self._MarkLastCommands(node.children[-1])
|
| 1987 |
|
| 1988 | def _RemoveSubshells(self, node):
|
| 1989 | # type: (command_t) -> command_t
|
| 1990 | """Eliminate redundant subshells like ( echo hi ) | wc -l etc.
|
| 1991 |
|
| 1992 | This is ONLY called at the top level of ExecuteAndCatch() - it wouldn't
|
| 1993 | be correct otherwise.
|
| 1994 | """
|
| 1995 | UP_node = node
|
| 1996 | with tagswitch(node) as case:
|
| 1997 | if case(command_e.Subshell):
|
| 1998 | node = cast(command.Subshell, UP_node)
|
| 1999 | # Optimize ( ( date ) ) etc.
|
| 2000 | return self._RemoveSubshells(node.child)
|
| 2001 | return node
|
| 2002 |
|
| 2003 | def ExecuteAndCatch(self, node, cmd_flags):
|
| 2004 | # type: (command_t, int) -> Tuple[bool, bool]
|
| 2005 | """Execute a subprogram, handling vm.IntControlFlow and fatal exceptions.
|
| 2006 |
|
| 2007 | Args:
|
| 2008 | node: LST subtree
|
| 2009 | optimize: Whether to exec the last process rather than fork/exec
|
| 2010 |
|
| 2011 | Returns:
|
| 2012 | TODO: use enum 'why' instead of the 2 booleans
|
| 2013 |
|
| 2014 | Used by
|
| 2015 | - main_loop.py.
|
| 2016 | - SubProgramThunk for pipelines, subshell, command sub, process sub
|
| 2017 | - TODO: Signals besides EXIT trap
|
| 2018 |
|
| 2019 | Note: To do what optimize does, dash has EV_EXIT flag and yash has a
|
| 2020 | finally_exit boolean. We use a different algorithm.
|
| 2021 | """
|
| 2022 | if cmd_flags & OptimizeSubshells:
|
| 2023 | node = self._RemoveSubshells(node)
|
| 2024 |
|
| 2025 | if cmd_flags & MarkLastCommands:
|
| 2026 | # Mark the last command in each process, so we may avoid forks
|
| 2027 | self._MarkLastCommands(node)
|
| 2028 |
|
| 2029 | if 0:
|
| 2030 | log('after opt:')
|
| 2031 | node.PrettyPrint()
|
| 2032 | log('')
|
| 2033 |
|
| 2034 | is_return = False
|
| 2035 | is_fatal = False
|
| 2036 | is_errexit = False
|
| 2037 |
|
| 2038 | err = None # type: error.FatalRuntime
|
| 2039 | status = -1 # uninitialized
|
| 2040 |
|
| 2041 | try:
|
| 2042 | options = [] # type: List[int]
|
| 2043 | if cmd_flags & NoDebugTrap:
|
| 2044 | options.append(option_i._no_debug_trap)
|
| 2045 | if cmd_flags & NoErrTrap:
|
| 2046 | options.append(option_i._no_err_trap)
|
| 2047 | with state.ctx_Option(self.mutable_opts, options, True):
|
| 2048 | status = self._Execute(node)
|
| 2049 | except vm.IntControlFlow as e:
|
| 2050 | if cmd_flags & RaiseControlFlow:
|
| 2051 | raise # 'eval break' and 'source return.sh', etc.
|
| 2052 | else:
|
| 2053 | # Return at top level is OK, unlike in bash.
|
| 2054 | if e.IsReturn():
|
| 2055 | is_return = True
|
| 2056 | status = e.StatusCode()
|
| 2057 | else:
|
| 2058 | # TODO: This error message is invalid. Can also happen in eval.
|
| 2059 | # We need a flag.
|
| 2060 |
|
| 2061 | # Invalid control flow
|
| 2062 | self.errfmt.Print_(
|
| 2063 | "Loop and control flow can't be in different processes",
|
| 2064 | blame_loc=e.token)
|
| 2065 | is_fatal = True
|
| 2066 | # All shells exit 0 here. It could be hidden behind
|
| 2067 | # strict_control_flow if the incompatibility causes problems.
|
| 2068 | status = 1
|
| 2069 | except error.Parse as e:
|
| 2070 | self.dumper.MaybeRecord(self, e) # Do this before unwinding stack
|
| 2071 | raise
|
| 2072 | except error.ErrExit as e:
|
| 2073 | err = e
|
| 2074 | is_errexit = True
|
| 2075 | except error.FatalRuntime as e:
|
| 2076 | err = e
|
| 2077 |
|
| 2078 | if err:
|
| 2079 | status = err.ExitStatus()
|
| 2080 |
|
| 2081 | is_fatal = True
|
| 2082 | # Do this before unwinding stack
|
| 2083 | self.dumper.MaybeRecord(self, err)
|
| 2084 |
|
| 2085 | if not err.HasLocation(): # Last resort!
|
| 2086 | #log('Missing location')
|
| 2087 | err.location = self.mem.GetFallbackLocation()
|
| 2088 | #log('%s', err.location)
|
| 2089 |
|
| 2090 | if is_errexit:
|
| 2091 | if self.exec_opts.verbose_errexit():
|
| 2092 | self.errfmt.PrintErrExit(cast(error.ErrExit, err),
|
| 2093 | posix.getpid())
|
| 2094 | else:
|
| 2095 | self.errfmt.PrettyPrintError(err, prefix='fatal: ')
|
| 2096 |
|
| 2097 | assert status >= 0, 'Should have been initialized'
|
| 2098 |
|
| 2099 | # Problem: We have no idea here if a SUBSHELL (or pipeline comment) already
|
| 2100 | # created a crash dump. So we get 2 or more of them.
|
| 2101 | self.dumper.MaybeDump(status)
|
| 2102 |
|
| 2103 | self.mem.SetLastStatus(status)
|
| 2104 | return is_return, is_fatal
|
| 2105 |
|
| 2106 | def EvalCommand(self, block):
|
| 2107 | # type: (command_t) -> int
|
| 2108 | """For builtins to evaluate command args.
|
| 2109 |
|
| 2110 | Many exceptions are raised.
|
| 2111 |
|
| 2112 | Examples:
|
| 2113 |
|
| 2114 | cd /tmp (; ; mycmd)
|
| 2115 |
|
| 2116 | And:
|
| 2117 | eval (mycmd)
|
| 2118 | call _io->eval(mycmd)
|
| 2119 |
|
| 2120 | (Should those be more like eval 'mystring'?)
|
| 2121 | """
|
| 2122 | return self._Execute(block) # can raise FatalRuntimeError, etc.
|
| 2123 |
|
| 2124 | def RunTrapsOnExit(self, mut_status):
|
| 2125 | # type: (IntParamBox) -> None
|
| 2126 | """If an EXIT trap handler exists, run it.
|
| 2127 |
|
| 2128 | Only mutates the status if 'return' or 'exit'. This is odd behavior, but
|
| 2129 | all bash/dash/mksh seem to agree on it. See cases in
|
| 2130 | builtin-trap.test.sh.
|
| 2131 |
|
| 2132 | Note: if we could easily modulo -1 % 256 == 255 here, then we could get rid
|
| 2133 | of this awkward interface. But that's true in Python and not C!
|
| 2134 |
|
| 2135 | Could use i & (n-1) == i & 255 because we have a power of 2.
|
| 2136 | https://stackoverflow.com/questions/14997165/fastest-way-to-get-a-positive-modulo-in-c-c
|
| 2137 | """
|
| 2138 | # This does not raise, even on 'exit', etc.
|
| 2139 | self.RunPendingTrapsAndCatch()
|
| 2140 |
|
| 2141 | node = self.trap_state.GetHook('EXIT') # type: command_t
|
| 2142 | if node:
|
| 2143 | # NOTE: Don't set option_i._running_trap, because that's for
|
| 2144 | # RunPendingTraps() in the MAIN LOOP
|
| 2145 | with dev.ctx_Tracer(self.tracer, 'trap EXIT', None):
|
| 2146 | try:
|
| 2147 | is_return, is_fatal = self.ExecuteAndCatch(node, 0)
|
| 2148 | except util.UserExit as e: # explicit exit
|
| 2149 | mut_status.i = e.status
|
| 2150 | return
|
| 2151 | if is_return: # explicit 'return' in the trap handler!
|
| 2152 | mut_status.i = self.LastStatus()
|
| 2153 |
|
| 2154 | def _MaybeRunDebugTrap(self):
|
| 2155 | # type: () -> None
|
| 2156 | """Run user-specified DEBUG code before certain commands."""
|
| 2157 | node = self.trap_state.GetHook('DEBUG') # type: command_t
|
| 2158 | if node is None:
|
| 2159 | return
|
| 2160 |
|
| 2161 | # Fix lastpipe / job control / DEBUG trap interaction
|
| 2162 | if self.exec_opts._no_debug_trap():
|
| 2163 | return
|
| 2164 |
|
| 2165 | # Don't run recursively run traps, etc.
|
| 2166 | if not self.mem.ShouldRunDebugTrap():
|
| 2167 | return
|
| 2168 |
|
| 2169 | # NOTE: Don't set option_i._running_trap, because that's for
|
| 2170 | # RunPendingTraps() in the MAIN LOOP
|
| 2171 |
|
| 2172 | with dev.ctx_Tracer(self.tracer, 'trap DEBUG', None):
|
| 2173 | with state.ctx_Registers(self.mem): # prevent setting $? etc.
|
| 2174 | # for SetTokenForLine $LINENO
|
| 2175 | with state.ctx_DebugTrap(self.mem):
|
| 2176 | # Don't catch util.UserExit, etc.
|
| 2177 | self._Execute(node)
|
| 2178 |
|
| 2179 | def _MaybeRunErrTrap(self):
|
| 2180 | # type: () -> None
|
| 2181 | """
|
| 2182 | Run user-specified ERR code after checking the status of certain
|
| 2183 | commands (pipelines)
|
| 2184 | """
|
| 2185 | node = self.trap_state.GetHook('ERR') # type: command_t
|
| 2186 | if node is None:
|
| 2187 | return
|
| 2188 |
|
| 2189 | # ERR trap is only run for a whole pipeline, not its parts
|
| 2190 | if self.exec_opts._no_err_trap():
|
| 2191 | return
|
| 2192 |
|
| 2193 | # Prevent infinite recursion
|
| 2194 | if self.mem.running_err_trap:
|
| 2195 | return
|
| 2196 |
|
| 2197 | # "disabled errexit" rule
|
| 2198 | if self.mutable_opts.ErrExitIsDisabled():
|
| 2199 | return
|
| 2200 |
|
| 2201 | # bash rule - affected by set -o errtrace
|
| 2202 | if not self.exec_opts.errtrace() and self.mem.InsideFunction():
|
| 2203 | return
|
| 2204 |
|
| 2205 | # NOTE: Don't set option_i._running_trap, because that's for
|
| 2206 | # RunPendingTraps() in the MAIN LOOP
|
| 2207 |
|
| 2208 | with dev.ctx_Tracer(self.tracer, 'trap ERR', None):
|
| 2209 | # In bash, the PIPESTATUS register leaks. See spec/builtin-trap-err.
|
| 2210 | # So unlike other traps, we don't isolate registers.
|
| 2211 | #with state.ctx_Registers(self.mem): # prevent setting $? etc.
|
| 2212 | with state.ctx_ErrTrap(self.mem):
|
| 2213 | self._Execute(node)
|
| 2214 |
|
| 2215 | def RunProc(self, proc, cmd_val, self_val=None):
|
| 2216 | # type: (value.Proc, cmd_value.Argv, value_t) -> int
|
| 2217 | """Run procs aka "shell functions".
|
| 2218 |
|
| 2219 | For SimpleCommand and registered completion hooks.
|
| 2220 | """
|
| 2221 | sig = proc.sig
|
| 2222 | if sig.tag() == proc_sig_e.Closed:
|
| 2223 | # We're binding named params. User should use @rest. No 'shift'.
|
| 2224 | proc_argv = [] # type: List[str]
|
| 2225 | else:
|
| 2226 | proc_argv = cmd_val.argv[1:]
|
| 2227 |
|
| 2228 | # Hm this sets "$@". TODO: Set ARGV only
|
| 2229 | with state.ctx_ProcCall(self.mem, self.mutable_opts, proc, proc_argv):
|
| 2230 | func_proc.BindProcArgs(proc, cmd_val, self.mem, self_val=self_val)
|
| 2231 |
|
| 2232 | # Redirects still valid for functions.
|
| 2233 | # Here doc causes a pipe and Process(SubProgramThunk).
|
| 2234 | try:
|
| 2235 | status = self._Execute(proc.body)
|
| 2236 | except vm.IntControlFlow as e:
|
| 2237 | if e.IsReturn():
|
| 2238 | status = e.StatusCode()
|
| 2239 | else:
|
| 2240 | # break/continue used in the wrong place.
|
| 2241 | e_die(
|
| 2242 | 'Unexpected %r (in proc call)' %
|
| 2243 | lexer.TokenVal(e.token), e.token)
|
| 2244 | except error.FatalRuntime as e:
|
| 2245 | # Dump the stack before unwinding it
|
| 2246 | self.dumper.MaybeRecord(self, e)
|
| 2247 | raise
|
| 2248 |
|
| 2249 | return status
|
| 2250 |
|
| 2251 | def RunFuncForCompletion(self, proc, argv):
|
| 2252 | # type: (value.Proc, List[str]) -> int
|
| 2253 | """
|
| 2254 | Args:
|
| 2255 | argv: $1 $2 $3 ... not including $0
|
| 2256 | """
|
| 2257 | cmd_val = MakeBuiltinArgv(argv)
|
| 2258 |
|
| 2259 | # TODO: Change this to run YSH procs and funcs too
|
| 2260 | try:
|
| 2261 | status = self.RunProc(proc, cmd_val)
|
| 2262 | except error.FatalRuntime as e:
|
| 2263 | self.errfmt.PrettyPrintError(e)
|
| 2264 | status = e.ExitStatus()
|
| 2265 | except vm.IntControlFlow as e:
|
| 2266 | # shouldn't be able to exit the shell from a completion hook!
|
| 2267 | # TODO: Avoid overwriting the prompt!
|
| 2268 | self.errfmt.Print_('Attempted to exit from completion hook.',
|
| 2269 | blame_loc=e.token)
|
| 2270 |
|
| 2271 | status = 1
|
| 2272 | # NOTE: (IOError, OSError) are caught in completion.py:ReadlineCallback
|
| 2273 | return status
|
| 2274 |
|
| 2275 |
|
| 2276 | # vim: sw=4
|