George Karpenkov 1d3e49e781 [analyzer] Do not analyze bison-generated files
Bison/YACC generated files result in a very large number of (presumably)
false positives from the analyzer.
These false positives are "true" in a sense of the information analyzer
sees: assuming that the lexer can return any token at any point a number
of uninitialized reads does occur.
(naturally, the analyzer can not capture a complex invariant that
certain tokens can only occur under certain conditions).

Current fix simply stops analysis on those files.
I have examined a very large number of such auto-generated files, and
they do all start with such a comment.
Conversely, user code is very unlikely to contain such a comment.

rdar://33608161

Differential Revision: https://reviews.llvm.org/D43421

llvm-svn: 326135
2018-02-26 22:14:16 +00:00

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C

/* A Bison parser, made by GNU Bison 1.875. */
// RUN: rm -rf %t.plist
// RUN: %clang_analyze_cc1 -analyzer-checker=core -analyzer-output=plist -o %t.plist -verify %s
// RUN: FileCheck --input-file=%t.plist %s
// expected-no-diagnostics
int foo() {
int *x = 0;
return *x; // no-warning
}
// CHECK: <key>diagnostics</key>