# vim: set ts=8 sts=4 et sw=4 tw=99: # This Source Code Form is subject to the terms of the Mozilla Public # License, v. 2.0. If a copy of the MPL was not distributed with this # file, You can obtain one at http://mozilla.org/MPL/2.0/. #---------------------------------------------------------------------------- # This script checks various aspects of SpiderMonkey code style. The current checks are as # follows. # # We check the following things in headers. # # - No cyclic dependencies. # # - No normal header should #include a inlines.h/-inl.h file. # # - #ifndef wrappers should have the right form. (XXX: not yet implemented) # - Every header file should have one. # - The guard name used should be appropriate for the filename. # # We check the following things in all files. # # - #includes should have full paths, e.g. "jit/Ion.h", not "Ion.h". # # - #includes should use the appropriate form for system headers (<...>) and # local headers ("..."). # # - #includes should be ordered correctly. # - Each one should be in the correct section. # - Alphabetical order should be used within sections. # - Sections should be in the right order. # Note that the presence of #if/#endif blocks complicates things, to the # point that it's not always clear where a conditionally-compiled #include # statement should go, even to a human. Therefore, we check the #include # statements within each #if/#endif block (including nested ones) in # isolation, but don't try to do any order checking between such blocks. #---------------------------------------------------------------------------- from __future__ import print_function import difflib import os import re import sys from mozversioncontrol import get_repository_from_env # We don't bother checking files in these directories, because they're (a) auxiliary or (b) # imported code that doesn't follow our coding style. ignored_js_src_dirs = [ 'js/src/config/', # auxiliary stuff 'js/src/ctypes/libffi/', # imported code 'js/src/devtools/', # auxiliary stuff 'js/src/editline/', # imported code 'js/src/gdb/', # auxiliary stuff 'js/src/vtune/' # imported code ] # We ignore #includes of these files, because they don't follow the usual rules. included_inclnames_to_ignore = set([ 'ffi.h', # generated in ctypes/libffi/ 'devtools/sharkctl.h', # we ignore devtools/ in general 'devtools/Instruments.h', # we ignore devtools/ in general 'double-conversion.h', # strange MFBT case 'javascript-trace.h', # generated in $OBJDIR if HAVE_DTRACE is defined 'jsautokw.h', # generated in $OBJDIR 'jscustomallocator.h', # provided by embedders; allowed to be missing 'js-config.h', # generated in $OBJDIR 'fdlibm.h', # fdlibm 'pratom.h', # NSPR 'prcvar.h', # NSPR 'prerror.h', # NSPR 'prinit.h', # NSPR 'prio.h', # NSPR 'private/pprio.h', # NSPR 'prlink.h', # NSPR 'prlock.h', # NSPR 'prprf.h', # NSPR 'prthread.h', # NSPR 'prtypes.h', # NSPR 'selfhosted.out.h', # generated in $OBJDIR 'shellmoduleloader.out.h', # generated in $OBJDIR 'unicode/timezone.h', # ICU 'unicode/ucal.h', # ICU 'unicode/uclean.h', # ICU 'unicode/ucol.h', # ICU 'unicode/udat.h', # ICU 'unicode/udatpg.h', # ICU 'unicode/uenum.h', # ICU 'unicode/unorm.h', # ICU 'unicode/unum.h', # ICU 'unicode/unumsys.h', # ICU 'unicode/ustring.h', # ICU 'unicode/utypes.h', # ICU 'vtune/VTuneWrapper.h' # VTune ]) # These files have additional constraints on where they are #included, so we # ignore #includes of them when checking #include ordering. oddly_ordered_inclnames = set([ 'ctypes/typedefs.h', # Included multiple times in the body of ctypes/CTypes.h 'jsautokw.h', # Included in the body of frontend/TokenStream.h 'jswin.h', # Must be #included before <psapi.h> 'machine/endian.h', # Must be included after <sys/types.h> on BSD 'winbase.h', # Must precede other system headers(?) 'windef.h' # Must precede other system headers(?) ]) # The files in tests/style/ contain code that fails this checking in various # ways. Here is the output we expect. If the actual output differs from # this, one of the following must have happened. # - New SpiderMonkey code violates one of the checked rules. # - The tests/style/ files have changed without expected_output being changed # accordingly. # - This script has been broken somehow. # expected_output = '''\ js/src/tests/style/BadIncludes2.h:1: error: vanilla header includes an inline-header file "tests/style/BadIncludes2-inl.h" js/src/tests/style/BadIncludes.h:3: error: the file includes itself js/src/tests/style/BadIncludes.h:6: error: "BadIncludes2.h" is included using the wrong path; did you forget a prefix, or is the file not yet committed? js/src/tests/style/BadIncludes.h:8: error: <tests/style/BadIncludes2.h> should be included using the #include "..." form js/src/tests/style/BadIncludes.h:10: error: "stdio.h" is included using the wrong path; did you forget a prefix, or is the file not yet committed? js/src/tests/style/BadIncludesOrder-inl.h:5:6: error: "vm/Interpreter-inl.h" should be included after "jsscriptinlines.h" js/src/tests/style/BadIncludesOrder-inl.h:6:7: error: "jsscriptinlines.h" should be included after "js/Value.h" js/src/tests/style/BadIncludesOrder-inl.h:7:8: error: "js/Value.h" should be included after "ds/LifoAlloc.h" js/src/tests/style/BadIncludesOrder-inl.h:8:9: error: "ds/LifoAlloc.h" should be included after "jsapi.h" js/src/tests/style/BadIncludesOrder-inl.h:9:10: error: "jsapi.h" should be included after <stdio.h> js/src/tests/style/BadIncludesOrder-inl.h:10:11: error: <stdio.h> should be included after "mozilla/HashFunctions.h" js/src/tests/style/BadIncludesOrder-inl.h:27:28: error: "jsobj.h" should be included after "jsfun.h" (multiple files): error: header files form one or more cycles tests/style/HeaderCycleA1.h -> tests/style/HeaderCycleA2.h -> tests/style/HeaderCycleA3.h -> tests/style/HeaderCycleA1.h tests/style/HeaderCycleB1-inl.h -> tests/style/HeaderCycleB2-inl.h -> tests/style/HeaderCycleB3-inl.h -> tests/style/HeaderCycleB4-inl.h -> tests/style/HeaderCycleB1-inl.h -> tests/style/jsheadercycleB5inlines.h -> tests/style/HeaderCycleB1-inl.h -> tests/style/HeaderCycleB4-inl.h '''.splitlines(True) actual_output = [] def out(*lines): for line in lines: actual_output.append(line + '\n') def error(filename, linenum, *lines): location = filename if linenum is not None: location += ':' + str(linenum) out(location + ': error:') for line in (lines): out(' ' + line) out('') class FileKind(object): C = 1 CPP = 2 INL_H = 3 H = 4 TBL = 5 MSG = 6 @staticmethod def get(filename): if filename.endswith('.c'): return FileKind.C if filename.endswith('.cpp'): return FileKind.CPP if filename.endswith(('inlines.h', '-inl.h')): return FileKind.INL_H if filename.endswith('.h'): return FileKind.H if filename.endswith('.tbl'): return FileKind.TBL if filename.endswith('.msg'): return FileKind.MSG error(filename, None, 'unknown file kind') def check_style(): # We deal with two kinds of name. # - A "filename" is a full path to a file from the repository root. # - An "inclname" is how a file is referred to in a #include statement. # # Examples (filename -> inclname) # - "mfbt/Attributes.h" -> "mozilla/Attributes.h" # - "mfbt/decimal/Decimal.h -> "mozilla/Decimal.h" # - "mozglue/misc/TimeStamp.h -> "mozilla/TimeStamp.h" # - "memory/mozalloc/mozalloc.h -> "mozilla/mozalloc.h" # - "js/public/Vector.h" -> "js/Vector.h" # - "js/src/vm/String.h" -> "vm/String.h" non_js_dirnames = ('mfbt/', 'memory/mozalloc/', 'mozglue/') # type: tuple(str) non_js_inclnames = set() # type: set(inclname) js_names = dict() # type: dict(filename, inclname) repo = get_repository_from_env() # Select the appropriate files. for filename in repo.get_files_in_working_directory(): for non_js_dir in non_js_dirnames: if filename.startswith(non_js_dir) and filename.endswith('.h'): inclname = 'mozilla/' + filename.split('/')[-1] non_js_inclnames.add(inclname) if filename.startswith('js/public/') and filename.endswith('.h'): inclname = 'js/' + filename[len('js/public/'):] js_names[filename] = inclname if filename.startswith('js/src/') and \ not filename.startswith(tuple(ignored_js_src_dirs)) and \ filename.endswith(('.c', '.cpp', '.h', '.tbl', '.msg')): inclname = filename[len('js/src/'):] js_names[filename] = inclname all_inclnames = non_js_inclnames | set(js_names.values()) edges = dict() # type: dict(inclname, set(inclname)) # We don't care what's inside the MFBT and MOZALLOC files, but because they # are #included from JS files we have to add them to the inclusion graph. for inclname in non_js_inclnames: edges[inclname] = set() # Process all the JS files. for filename in js_names.keys(): inclname = js_names[filename] file_kind = FileKind.get(filename) if file_kind == FileKind.C or file_kind == FileKind.CPP or \ file_kind == FileKind.H or file_kind == FileKind.INL_H: included_h_inclnames = set() # type: set(inclname) # This script is run in js/src/, so prepend '../../' to get to the root of the Mozilla # source tree. with open(os.path.join(repo.path, filename)) as f: do_file(filename, inclname, file_kind, f, all_inclnames, included_h_inclnames) edges[inclname] = included_h_inclnames find_cycles(all_inclnames, edges) # Compare expected and actual output. difflines = difflib.unified_diff(expected_output, actual_output, fromfile='check_spider_monkey_style.py expected output', tofile='check_spider_monkey_style.py actual output') ok = True for diffline in difflines: ok = False print(diffline, end='') return ok def module_name(name): '''Strip the trailing .cpp, .h, inlines.h or -inl.h from a filename.''' return name.replace('inlines.h', '').replace('-inl.h', '').replace('.h', '').replace('.cpp', '') def is_module_header(enclosing_inclname, header_inclname): '''Determine if an included name is the "module header", i.e. should be first in the file.''' module = module_name(enclosing_inclname) # Normal case, e.g. module == "foo/Bar", header_inclname == "foo/Bar.h". if module == module_name(header_inclname): return True # A public header, e.g. module == "foo/Bar", header_inclname == "js/Bar.h". m = re.match(r'js\/(.*)\.h', header_inclname) if m is not None and module.endswith('/' + m.group(1)): return True return False class Include(object): '''Important information for a single #include statement.''' def __init__(self, inclname, linenum, is_system): self.inclname = inclname self.linenum = linenum self.is_system = is_system def isLeaf(self): return True def section(self, enclosing_inclname): '''Identify which section inclname belongs to. The section numbers are as follows. 0. Module header (e.g. jsfoo.h or jsfooinlines.h within jsfoo.cpp) 1. mozilla/Foo.h 2. <foo.h> or <foo> 3. jsfoo.h, prmjtime.h, etc 4. foo/Bar.h 5. jsfooinlines.h 6. foo/Bar-inl.h 7. non-.h, e.g. *.tbl, *.msg ''' if self.is_system: return 2 if not self.inclname.endswith('.h'): return 7 # A couple of modules have the .h file in js/ and the .cpp file elsewhere and so need # special handling. if is_module_header(enclosing_inclname, self.inclname): return 0 if '/' in self.inclname: if self.inclname.startswith('mozilla/'): return 1 if self.inclname.endswith('-inl.h'): return 6 return 4 if self.inclname.endswith('inlines.h'): return 5 return 3 def quote(self): if self.is_system: return '<' + self.inclname + '>' else: return '"' + self.inclname + '"' class HashIfBlock(object): '''Important information about a #if/#endif block. A #if/#endif block is the contents of a #if/#endif (or similar) section. The top-level block, which is not within a #if/#endif pair, is also considered a block. Each leaf is either an Include (representing a #include), or another nested HashIfBlock.''' def __init__(self): self.kids = [] def isLeaf(self): return False def do_file(filename, inclname, file_kind, f, all_inclnames, included_h_inclnames): block_stack = [HashIfBlock()] # Extract the #include statements as a tree of IBlocks and IIncludes. for linenum, line in enumerate(f, start=1): # We're only interested in lines that contain a '#'. if not '#' in line: continue # Look for a |#include "..."| line. m = re.match(r'\s*#\s*include\s+"([^"]*)"', line) if m is not None: block_stack[-1].kids.append(Include(m.group(1), linenum, False)) # Look for a |#include <...>| line. m = re.match(r'\s*#\s*include\s+<([^>]*)>', line) if m is not None: block_stack[-1].kids.append(Include(m.group(1), linenum, True)) # Look for a |#{if,ifdef,ifndef}| line. m = re.match(r'\s*#\s*(if|ifdef|ifndef)\b', line) if m is not None: # Open a new block. new_block = HashIfBlock() block_stack[-1].kids.append(new_block) block_stack.append(new_block) # Look for a |#{elif,else}| line. m = re.match(r'\s*#\s*(elif|else)\b', line) if m is not None: # Close the current block, and open an adjacent one. block_stack.pop() new_block = HashIfBlock() block_stack[-1].kids.append(new_block) block_stack.append(new_block) # Look for a |#endif| line. m = re.match(r'\s*#\s*endif\b', line) if m is not None: # Close the current block. block_stack.pop() def check_include_statement(include): '''Check the style of a single #include statement.''' if include.is_system: # Check it is not a known local file (in which case it's probably a system header). if include.inclname in included_inclnames_to_ignore or \ include.inclname in all_inclnames: error(filename, include.linenum, include.quote() + ' should be included using', 'the #include "..." form') else: if include.inclname not in included_inclnames_to_ignore: included_kind = FileKind.get(include.inclname) # Check the #include path has the correct form. if include.inclname not in all_inclnames: error(filename, include.linenum, include.quote() + ' is included using the wrong path;', 'did you forget a prefix, or is the file not yet committed?') # Record inclusions of .h files for cycle detection later. # (Exclude .tbl and .msg files.) elif included_kind == FileKind.H or included_kind == FileKind.INL_H: included_h_inclnames.add(include.inclname) # Check a H file doesn't #include an INL_H file. if file_kind == FileKind.H and included_kind == FileKind.INL_H: error(filename, include.linenum, 'vanilla header includes an inline-header file ' + include.quote()) # Check a file doesn't #include itself. (We do this here because the cycle # detection below doesn't detect this case.) if inclname == include.inclname: error(filename, include.linenum, 'the file includes itself') def check_includes_order(include1, include2): '''Check the ordering of two #include statements.''' if include1.inclname in oddly_ordered_inclnames or \ include2.inclname in oddly_ordered_inclnames: return section1 = include1.section(inclname) section2 = include2.section(inclname) if (section1 > section2) or \ ((section1 == section2) and (include1.inclname.lower() > include2.inclname.lower())): error(filename, str(include1.linenum) + ':' + str(include2.linenum), include1.quote() + ' should be included after ' + include2.quote()) # Check the extracted #include statements, both individually, and the ordering of # adjacent pairs that live in the same block. def pair_traverse(prev, this): if this.isLeaf(): check_include_statement(this) if prev is not None and prev.isLeaf(): check_includes_order(prev, this) else: for prev2, this2 in zip([None] + this.kids[0:-1], this.kids): pair_traverse(prev2, this2) pair_traverse(None, block_stack[-1]) def find_cycles(all_inclnames, edges): '''Find and draw any cycles.''' SCCs = tarjan(all_inclnames, edges) # The various sorted() calls below ensure the output is deterministic. def draw_SCC(c): cset = set(c) drawn = set() def draw(v, indent): out(' ' * indent + ('-> ' if indent else ' ') + v) if v in drawn: return drawn.add(v) for succ in sorted(edges[v]): if succ in cset: draw(succ, indent + 1) draw(sorted(c)[0], 0) out('') have_drawn_an_SCC = False for scc in sorted(SCCs): if len(scc) != 1: if not have_drawn_an_SCC: error('(multiple files)', None, 'header files form one or more cycles') have_drawn_an_SCC = True draw_SCC(scc) # Tarjan's algorithm for finding the strongly connected components (SCCs) of a graph. # https://en.wikipedia.org/wiki/Tarjan%27s_strongly_connected_components_algorithm def tarjan(V, E): vertex_index = {} vertex_lowlink = {} index = 0 S = [] all_SCCs = [] def strongconnect(v, index): # Set the depth index for v to the smallest unused index vertex_index[v] = index vertex_lowlink[v] = index index += 1 S.append(v) # Consider successors of v for w in E[v]: if w not in vertex_index: # Successor w has not yet been visited; recurse on it index = strongconnect(w, index) vertex_lowlink[v] = min(vertex_lowlink[v], vertex_lowlink[w]) elif w in S: # Successor w is in stack S and hence in the current SCC vertex_lowlink[v] = min(vertex_lowlink[v], vertex_index[w]) # If v is a root node, pop the stack and generate an SCC if vertex_lowlink[v] == vertex_index[v]: i = S.index(v) scc = S[i:] del S[i:] all_SCCs.append(scc) return index for v in V: if v not in vertex_index: index = strongconnect(v, index) return all_SCCs def main(): ok = check_style() if ok: print('TEST-PASS | check_spidermonkey_style.py | ok') else: print('TEST-UNEXPECTED-FAIL | check_spidermonkey_style.py | actual output does not match expected output; diff is above') sys.exit(0 if ok else 1) if __name__ == '__main__': main()