1// SPDX-License-Identifier: GPL-2.0-only 2/// 3/// Remove unneeded variable used to store return value. 4/// 5// Confidence: Moderate 6// Copyright: (C) 2012 Peter Senna Tschudin, INRIA/LIP6. 7// URL: https://coccinelle.gitlabpages.inria.fr/website 8// Comments: Comments on code can be deleted if near code that is removed. 9// "when strict" can be removed to get more hits, but adds false 10// positives 11// Options: --no-includes --include-headers 12 13virtual patch 14virtual report 15virtual context 16virtual org 17 18@depends on patch@ 19type T; 20constant C; 21identifier ret; 22@@ 23- T ret = C; 24... when != ret 25 when strict 26return 27- ret 28+ C 29; 30 31@depends on context@ 32type T; 33constant C; 34identifier ret; 35@@ 36* T ret = C; 37... when != ret 38 when strict 39* return ret; 40 41@r1 depends on report || org@ 42type T; 43constant C; 44identifier ret; 45position p1, p2; 46@@ 47T ret@p1 = C; 48... when != ret 49 when strict 50return ret@p2; 51 52@script:python depends on report@ 53p1 << r1.p1; 54p2 << r1.p2; 55C << r1.C; 56ret << r1.ret; 57@@ 58coccilib.report.print_report(p1[0], "Unneeded variable: \"" + ret + "\". Return \"" + C + "\" on line " + p2[0].line) 59 60@script:python depends on org@ 61p1 << r1.p1; 62p2 << r1.p2; 63C << r1.C; 64ret << r1.ret; 65@@ 66cocci.print_main("unneeded \"" + ret + "\" variable", p1) 67cocci.print_sec("return " + C + " here", p2) 68