http://llvm.org/bugs/show_bug.cgi?id=21908
Bug ID: 21908
Summary: Detect unnecessary postfix ++ or --
Product: clang
Version: unspecified
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: Static Analyzer
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
In code like this:
1: i = 32767 + read_help_topic(INTRO_AUTHORS, 0, 32767, screen_text);
2: screen_text[i++] = '\0';
3: i = 32767 + read_help_topic(INTRO_CREDITS, 0, 32767, credits);
4: credits[i++] = '\0';
5:
6: j = 0;
7: authors.push_back(0); /* find the start of each
credit-line */
8: for (i = 0; credits[i] != 0; i++)
9: if (credits[i] == 10)
10: authors.push_back(i+1);
11: authors.push_back(i);
The postfix ++ applied on lines 2 and 4 result in a modification to i that is
never read, but deadcode.DeadStores doesn't report this.
See attached source, lines 40-43 in intro.cpp
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