2 # Copyright (c) 2012 The Native Client Authors. All rights reserved.
3 # Use of this source code is governed by a BSD-style license that can be
4 # found in the LICENSE file.
6 # Global environment and expression parsing for the PNaCl driver
9 # This dictionary initializes a shell-like environment.
10 # Shell escaping and ${} substitution are provided.
11 # See "class Environment" defined later for the implementation.
13 from driver_log import Log, DriverExit
14 from shelltools import shell
19 'DRIVER_PATH' : '', # Absolute path to this driver invocation
20 'DRIVER_BIN' : '', # PNaCl driver bin/ directory
21 'DRIVER_REV_FILE' : '${DRIVER_BIN}/REV',
23 'BASE_NACL' : '${@FindBaseNaCl}', # Absolute path of native_client/
24 'BASE_TOOLCHAIN' : '${@FindBaseToolchain}', # Absolute path to toolchain/OS_ARCH/
25 'BASE' : '${@FindBasePNaCl}', # Absolute path to PNaCl
26 'BUILD_OS' : '${@GetBuildOS}', # "linux", "darwin" or "windows"
27 'BUILD_ARCH' : '${@GetBuildArch}', # "x86_64" or "i686" or "i386"
30 'BPREFIXES' : '', # Prefixes specified using the -B flag.
31 'BASE_LLVM' : '${@FindBaseHost:clang}',
32 'BASE_BINUTILS' : '${@FindBaseHost:le32-nacl-ar}',
34 'BASE_LIB_NATIVE' : '${BASE}/lib-',
36 'BASE_USR' : '${BASE}/usr',
37 'BASE_SDK' : '${BASE}/sdk',
38 'BASE_LIB' : '${BASE}/lib',
39 'BASE_USR_ARCH' : '${BASE_USR_%BCLIB_ARCH%}',
40 'BASE_USR_X8632' : '${BASE}/usr-bc-x86-32',
41 'BASE_USR_X8664' : '${BASE}/usr-bc-x86-64',
42 'BASE_USR_ARM' : '${BASE}/usr-bc-arm',
43 'BASE_LIB_ARCH' : '${BASE_LIB_%BCLIB_ARCH%}',
44 'BASE_LIB_X8632' : '${BASE}/lib-bc-x86-32',
45 'BASE_LIB_X8664' : '${BASE}/lib-bc-x86-64',
46 'BASE_LIB_ARM' : '${BASE}/lib-bc-arm',
48 'LIBS_NATIVE_ARCH' : '${LIBS_NATIVE_%ARCH%}',
49 'LIBS_NATIVE_ARM' : '${BASE_LIB_NATIVE}arm',
50 'LIBS_NATIVE_ARM_NONSFI' : '${BASE_LIB_NATIVE}arm-nonsfi',
51 'LIBS_NATIVE_X8632' : '${BASE_LIB_NATIVE}x86-32',
52 'LIBS_NATIVE_X8632_NONSFI' : '${BASE_LIB_NATIVE}x86-32-nonsfi',
53 'LIBS_NATIVE_X8664' : '${BASE_LIB_NATIVE}x86-64',
54 'LIBS_NATIVE_MIPS32' : '${BASE_LIB_NATIVE}mips32',
56 'BASE_LLVM_BIN' : '${BASE_LLVM}/bin',
58 '${BASE_TOOLCHAIN}/pnacl_translator/${STANDARD_ARCH}/bin',
60 # TODO(pdox): Unify this with ARCH.
61 'STANDARD_ARCH' : '${STANDARD_ARCH_%ARCH%}',
62 'STANDARD_ARCH_X8632' : 'i686',
63 'STANDARD_ARCH_X8664' : 'x86_64',
64 'STANDARD_ARCH_ARM' : 'armv7',
65 'STANDARD_ARCH_MIPS32': 'mips32',
67 'SCONS_OUT' : '${BASE_NACL}/scons-out',
70 'ARCH' : '', # Target architecture, including optional
71 # suffixes such as '_NONSFI' or '_LINUX'.
72 'BASE_ARCH' : '', # Target architecture without any '_NONSFI' suffix.
73 # Derived from ARCH field.
74 'NONSFI_NACL' : '0', # Whether targeting Non-SFI Mode. Derived from
76 'BIAS' : 'NONE', # This can be 'NONE', 'ARM', 'MIPS32', 'X8632' or
78 # When not set to none, this causes the front-end to
79 # act like a target-specific compiler. This bias is
80 # currently needed while compiling newlib,
81 # and some scons tests.
83 'SAVE_TEMPS' : '0', # Do not clean up temporary files
84 'SANDBOXED' : '0', # Use sandboxed toolchain for this arch. (main switch)
85 'HAS_FRONTEND': '', # Set by ReadConfig(). '1' if the driver install
86 # has support for front-end bitcode tools, or '0'
87 # if it only has the backend translator.
90 # Args passed from one driver invocation to another
91 'INHERITED_DRIVER_ARGS' : '',
95 'LOG_VERBOSE' : '0', # Log to stdout (--pnacl-driver-verbose)
98 'SO_EXT' : '${SO_EXT_%BUILD_OS%}',
99 'SO_EXT_darwin' : '.dylib',
100 'SO_EXT_linux' : '.so',
101 'SO_EXT_windows' : '.dll',
103 'SO_DIR' : '${SO_DIR_%BUILD_OS%}',
104 'SO_DIR_darwin' : 'lib',
105 'SO_DIR_linux' : 'lib',
106 'SO_DIR_windows' : 'bin', # On Windows, DLLs are placed in bin/
107 # because the dynamic loader searches %PATH%
109 'EXEC_EXT' : '${EXEC_EXT_%BUILD_OS%}',
110 'EXEC_EXT_darwin' : '',
111 'EXEC_EXT_linux' : '',
112 'EXEC_EXT_windows': '.exe',
114 'SCONS_OS' : '${SCONS_OS_%BUILD_OS%}',
115 'SCONS_OS_linux' : 'linux',
116 'SCONS_OS_darwin' : 'mac',
117 'SCONS_OS_windows' : 'win',
120 'GOLD_PLUGIN_SO' : '${BASE_LLVM}/${SO_DIR}/LLVMgold${SO_EXT}',
122 'SCONS_STAGING' : '${SCONS_STAGING_%ARCH%}',
123 'SCONS_STAGING_X8632' : '${SCONS_OUT}/opt-${SCONS_OS}-x86-32/staging',
124 'SCONS_STAGING_X8664' : '${SCONS_OUT}/opt-${SCONS_OS}-x86-64/staging',
125 'SCONS_STAGING_ARM' : '${SCONS_OUT}/opt-${SCONS_OS}-arm/staging',
126 'SCONS_STAGING_MIPS32': '${SCONS_OUT}/opt-${SCONS_OS}-mips32/staging',
128 'SEL_UNIVERSAL_PREFIX': '${USE_EMULATOR ? ${EMULATOR}}',
129 'SEL_UNIVERSAL' : '${SCONS_STAGING}/sel_universal${EXEC_EXT}',
130 # NOTE: -Q skips sel_ldr qualification tests, -c -c skips validation
131 # NOTE: We are not using -B to load the IRT, since the translators do not
133 'SEL_UNIVERSAL_FLAGS' : '--abort_on_error ' +
134 '--uses_reverse_service ' +
135 '${USE_EMULATOR ? -Q -c -c --command_prefix ${EMULATOR}}',
137 'EMULATOR' : '${EMULATOR_%ARCH%}',
138 'EMULATOR_X8632' : '',
139 'EMULATOR_X8664' : '',
140 # NOTE: this is currently the only dependency on the arm trusted TC
142 '${BASE_NACL}/toolchain/linux_x86/arm_trusted/run_under_qemu_arm',
144 '${BASE_NACL}/toolchain/linux_x86/mips_trusted/run_under_qemu_mips32',
146 'SEL_LDR' : '${SCONS_STAGING}/sel_ldr${EXEC_EXT}',
147 'BOOTSTRAP_LDR' : '${SCONS_STAGING}/nacl_helper_bootstrap${EXEC_EXT}',
149 # sandboxed llvm backend
150 'LLC_SB' : '${TRANSLATOR_BIN}/pnacl-llc.nexe',
151 # sandboxed linker (gold based)
152 'LD_SB' : '${TRANSLATOR_BIN}/ld.nexe',
155 'CLANG' : '${BASE_LLVM_BIN}/clang${EXEC_EXT}',
156 # 'clang++' doesn't work on Windows (outside of Cygwin),
157 # because it is a symlink.
158 'CLANGXX' : '${BASE_LLVM_BIN}/clang${EXEC_EXT} --driver-mode=g++',
159 'LLVM_OPT' : '${BASE_LLVM_BIN}/opt${EXEC_EXT}',
160 'LLVM_DIS' : '${BASE_LLVM_BIN}/llvm-dis${EXEC_EXT}',
161 'LLVM_NM' : '${BASE_LLVM_BIN}/llvm-nm${EXEC_EXT}',
162 # llvm-as compiles llvm assembly (.ll) to bitcode (.bc/.po)
163 'LLVM_AS' : '${BASE_LLVM_BIN}/llvm-as${EXEC_EXT}',
164 'PNACL_ABICHECK': '${BASE_LLVM_BIN}/pnacl-abicheck${EXEC_EXT}',
165 'PNACL_COMPRESS': '${BASE_LLVM_BIN}/pnacl-bccompress${EXEC_EXT}',
168 'LLVM_PNACL_LLC': '${BASE_LLVM_BIN}/pnacl-llc${EXEC_EXT}',
169 # llvm-mc is llvm's native assembler
170 'LLVM_MC' : '${BASE_LLVM_BIN}/llvm-mc${EXEC_EXT}',
173 'BINUTILS_BASE' : '${BASE_BINUTILS}/bin/le32-nacl-',
174 'OBJDUMP' : '${BINUTILS_BASE}objdump${EXEC_EXT}',
175 'NM' : '${BINUTILS_BASE}nm${EXEC_EXT}',
176 'AR' : '${BINUTILS_BASE}ar${EXEC_EXT}',
177 'RANLIB' : '${BINUTILS_BASE}ranlib${EXEC_EXT}',
178 'READELF' : '${BINUTILS_BASE}readelf${EXEC_EXT}',
179 'STRIP' : '${BINUTILS_BASE}strip${EXEC_EXT}',
180 # linker (used for both bitcode and ELF linking)
181 'LD' : '${BINUTILS_BASE}ld.gold${EXEC_EXT}',
184 ######################################################################
188 ######################################################################
190 def ParseError(s, leftpos, rightpos, msg):
191 Log.Error("Parse Error: %s", msg)
193 Log.Error(' ' + (' '*leftpos) + ('^'*(rightpos - leftpos + 1)))
196 # Find the leftmost position in "s" which begins a substring
197 # in "strset", starting at "pos".
199 # FindFirst('hello world', 0, ['h','o']) = ('h', 0)
200 # FindFirst('hello world', 1, ['h','o']) = ('o', 4)
201 # FindFirst('hello world', 0, ['x']) = (None,11)
202 def FindFirst(s, pos, strset):
205 m[s.find(ss, pos)] = ss
209 return (None, len(s))
213 class Environment(object):
217 def register(cls, func):
218 """ Register a function for use in the evaluator """
219 cls.functions[func.__name__] = func
227 self.data = dict(INITIAL_ENV)
229 def update(self, extra):
230 self.data.update(extra)
233 for (k,v) in self.data.iteritems():
234 print '%s == %s' % (k,v)
237 self.stack.append(self.data)
238 self.data = dict(self.data) # Make a copy
241 self.data = self.stack.pop()
243 def has(self, varname):
244 return varname in self.data
246 def getraw(self, varname):
247 return self.eval(self.data[varname])
249 # Evaluate a variable from the environment.
250 # Returns a list of terms.
251 def get(self, varname):
252 return shell.split(self.getraw(varname))
254 # Retrieve a variable from the environment which
255 # is a single term. Returns a string.
256 def getone(self, varname):
257 return shell.unescape(self.getraw(varname))
259 def getbool(self, varname):
260 return bool(int(self.getone(varname)))
262 def setbool(self, varname, val):
264 self.set(varname, '1')
266 self.set(varname, '0')
268 # Set a variable in the environment without shell-escape
269 def setraw(self, varname, val):
270 self.data[varname] = val
272 # Set one or more variables using named arguments
273 def setmany(self, **kwargs):
274 for k,v in kwargs.iteritems():
275 if isinstance(v, types.StringTypes):
277 elif isinstance(v, types.ListType):
280 Log.Fatal('env.setmany given a non-string and non-list value')
282 def clear(self, varname):
283 self.data[varname] = ''
285 # Set a variable to one or more terms, applying shell-escape.
286 def set(self, varname, *vals):
288 self.append(varname, *vals)
290 # Append one or more terms to a variable in the
291 # environment, applying shell-escape.
292 def append(self, varname, *vals):
293 escaped = [ shell.escape(v) for v in vals ]
294 if len(self.data[varname]) > 0:
295 self.data[varname] += ' '
296 self.data[varname] += ' '.join(escaped)
298 # Evaluate an expression s
300 (result, i) = self.eval_expr(s, 0, [])
304 ######################################################################
305 # EXPRESSION EVALUATION CODE
306 # Context Free Grammar:
308 # str = empty | string literal
309 # expr = str | expr '$' '{' bracket_expr '}' expr
310 # bracket_expr = varname | boolexpr ? expr | boolexpr ? expr : expr | @call
311 # boolexpr = boolval | boolval '&&' boolexpr | boolval '||' boolexpr
312 # boolval = varname | !varname | #varname | !#varname | varname '==' str
313 # varname = str | varname '%' bracket_expr '%' varname
314 # call = func | func ':' arglist
316 # arglist = empty | arg ':' arglist
318 # Do not call these functions outside of this class.
319 # The env.eval method is the external interface to the evaluator.
320 ######################################################################
322 # Evaluate a string literal
323 def eval_str(self, s, pos, terminators):
324 (_,i) = FindFirst(s, pos, terminators)
327 # Evaluate %var% substitutions inside a variable name.
328 # Returns (the_actual_variable_name, endpos)
329 # Terminated by } character
330 def eval_varname(self, s, pos, terminators):
331 (_,i) = FindFirst(s, pos, ['%'] + terminators)
332 leftpart = s[pos:i].strip(' ')
333 if i == len(s) or s[i] in terminators:
336 (middlepart, j) = self.eval_bracket_expr(s, i+1, ['%'])
337 if j == len(s) or s[j] != '%':
338 ParseError(s, i, j, "Unterminated %")
340 (rightpart, k) = self.eval_varname(s, j+1, terminators)
342 fullname = leftpart + middlepart + rightpart
343 fullname = fullname.strip()
347 def eval_whitespace(self, s, pos):
349 while i < len(s) and s[i] == ' ':
353 def eval_bool_val(self, s, pos, terminators):
354 (_,i) = self.eval_whitespace(s, pos)
362 (_,i) = self.eval_whitespace(s, i)
370 (varname, j) = self.eval_varname(s, i, ['=']+terminators)
372 # This is an error condition one level up. Don't evaluate anything.
375 if varname not in self.data:
376 ParseError(s, i, j, "Undefined variable '%s'" % varname)
377 vardata = self.data[varname]
379 contents = self.eval(vardata)
382 # String equality test
383 if j+1 == len(s) or s[j+1] != '=':
384 ParseError(s, j, j, "Unexpected token")
386 ParseError(s, j, j, "Cannot combine == and #")
387 (_,j) = self.eval_whitespace(s, j+2)
388 (literal_str,j) = self.eval_str(s, j, [' ']+terminators)
389 (_,j) = self.eval_whitespace(s, j)
391 return (False, j) # Error one level up
396 val = (len(contents) != 0)
397 elif literal_str is not None:
398 val = (contents == literal_str)
400 if contents not in ('0','1'):
402 "%s evaluated to %s, which is not a boolean!" % (varname, contents))
403 val = bool(int(contents))
404 return (negated ^ val, j)
406 # Evaluate a boolexpr
407 def eval_bool_expr(self, s, pos, terminators):
408 (boolval1, i) = self.eval_bool_val(s, pos, ['&','|']+terminators)
410 # This is an error condition one level up. Don't evaluate anything.
413 if s[i] in ('&','|'):
415 if i+1 == len(s) or s[i+1] != s[i]:
416 ParseError(s, i, i, "Unexpected token")
417 is_and = (s[i] == '&')
419 (boolval2, j) = self.eval_bool_expr(s, i+2, terminators)
421 # This is an error condition one level up.
425 return (boolval1 and boolval2, j)
427 return (boolval1 or boolval2, j)
431 # Evaluate the inside of a ${} or %%.
432 # Returns the (the_evaluated_string, endpos)
433 def eval_bracket_expr(self, s, pos, terminators):
434 (_,pos) = self.eval_whitespace(s, pos)
437 # Function call: ${@func}
438 # or possibly : ${@func:arg1:arg2...}
439 (_,i) = FindFirst(s, pos, [':']+terminators)
441 return ('', i) # Error one level up
442 funcname = s[pos+1:i]
448 (_,j) = FindFirst(s, i+1, terminators)
450 return ('', j) # Error one level up
451 args = s[i+1:j].split(':')
453 val = self.functions[funcname](*args)
454 contents = self.eval(val)
457 (m,_) = FindFirst(s, pos, ['?']+terminators)
459 # Regular variable substitution
460 (varname,i) = self.eval_varname(s, pos, terminators)
462 return ('', i) # Error one level up
463 if varname not in self.data:
464 ParseError(s, pos, i, "Undefined variable '%s'" % varname)
465 vardata = self.data[varname]
466 contents = self.eval(vardata)
470 (is_cond_true,i) = self.eval_bool_expr(s, pos, ['?']+terminators)
471 assert(i < len(s) and s[i] == '?')
473 (if_true_expr, j) = self.eval_expr(s, i+1, [' : ']+terminators)
475 return ('', j) # Error one level up
477 if s[j:j+3] == ' : ':
478 (if_false_expr,j) = self.eval_expr(s, j+3, terminators)
480 # This is an error condition one level up.
486 contents = if_true_expr.strip()
488 contents = if_false_expr.strip()
492 # Evaluate an expression with ${} in string s, starting at pos.
493 # Returns (the_evaluated_expression, endpos)
494 def eval_expr(self, s, pos, terminators):
495 (m,i) = FindFirst(s, pos, ['${'] + terminators)
497 if i == len(s) or m in terminators:
500 (middlepart, j) = self.eval_bracket_expr(s, i+2, ['}'])
501 if j == len(s) or s[j] != '}':
502 ParseError(s, i, j, 'Unterminated ${')
504 (rightpart, k) = self.eval_expr(s, j+1, terminators)
505 return (leftpart + middlepart + rightpart, k)
510 def override_env(meth_name, func):
511 """Override a method in the global |env|, given the method name
512 and the new function.
515 setattr(env, meth_name, types.MethodType(func, env, Environment))