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60f3b07118
Extend checker 'ErrnoModeling' with a state of 'errno' to indicate the importance of the 'errno' value and how it should be used. Add a new checker 'ErrnoChecker' that observes use of 'errno' and finds possible wrong uses, based on the "errno state". The "errno state" should be set (together with value of 'errno') by other checkers (that perform modeling of the given function) in the future. Currently only a test function can set this value. The new checker has no user-observable effect yet. Reviewed By: martong, steakhal Differential Revision: https://reviews.llvm.org/D122150
63 lines
2.8 KiB
C
63 lines
2.8 KiB
C
// RUN: %clang_analyze_cc1 -verify -analyzer-output text %s \
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// RUN: -analyzer-checker=core \
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// RUN: -analyzer-checker=apiModeling.Errno \
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// RUN: -analyzer-checker=debug.ExprInspection \
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// RUN: -analyzer-checker=debug.ErrnoTest \
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// RUN: -analyzer-checker=alpha.unix.Errno \
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// RUN: -DERRNO_VAR
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// RUN: %clang_analyze_cc1 -verify -analyzer-output text %s \
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// RUN: -analyzer-checker=core \
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// RUN: -analyzer-checker=apiModeling.Errno \
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// RUN: -analyzer-checker=debug.ExprInspection \
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// RUN: -analyzer-checker=debug.ErrnoTest \
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// RUN: -analyzer-checker=alpha.unix.Errno \
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// RUN: -DERRNO_FUNC
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#include "Inputs/errno_var.h"
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#include "Inputs/system-header-simulator.h"
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#ifdef ERRNO_VAR
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#include "Inputs/errno_var.h"
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#endif
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#ifdef ERRNO_FUNC
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#include "Inputs/errno_func.h"
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#endif
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int ErrnoTesterChecker_setErrnoCheckState();
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void something();
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void testErrnoCheckUndefRead() {
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int X = ErrnoTesterChecker_setErrnoCheckState();
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something();
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X = ErrnoTesterChecker_setErrnoCheckState(); // expected-note{{Assuming that this function succeeds but sets 'errno' to an unspecified value}}
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if (X == 0) { // expected-note{{'X' is equal to 0}}
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// expected-note@-1{{Taking true branch}}
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if (errno) {
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} // expected-warning@-1{{An undefined value may be read from 'errno'}}
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// expected-note@-2{{An undefined value may be read from 'errno'}}
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}
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}
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void testErrnoCheckOverwrite() {
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int X = ErrnoTesterChecker_setErrnoCheckState();
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something();
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X = ErrnoTesterChecker_setErrnoCheckState(); // expected-note{{Assuming that this function returns 2. 'errno' should be checked to test for failure}}
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if (X == 2) { // expected-note{{'X' is equal to 2}}
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// expected-note@-1{{Taking true branch}}
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errno = 0; // expected-warning{{Value of 'errno' was not checked and is overwritten here}}
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// expected-note@-1{{Value of 'errno' was not checked and is overwritten here}}
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}
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}
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void testErrnoCheckOverwriteStdCall() {
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int X = ErrnoTesterChecker_setErrnoCheckState();
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something();
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X = ErrnoTesterChecker_setErrnoCheckState(); // expected-note{{Assuming that this function returns 2. 'errno' should be checked to test for failure}}
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if (X == 2) { // expected-note{{'X' is equal to 2}}
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// expected-note@-1{{Taking true branch}}
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printf(""); // expected-warning{{Value of 'errno' was not checked and may be overwritten by function 'printf'}}
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// expected-note@-1{{Value of 'errno' was not checked and may be overwritten by function 'printf'}}
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}
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}
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