mirror of
https://github.com/Zenithsiz/ftmemsim-valgrind.git
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4cae5c3ed5
support to Memcheck for tracking the origin of uninitialised values, if you use the --track-origins=yes flag. This currently causes some Memcheck regression tests to fail, because they now print an extra line of advisory text in their output. This will be fixed. The core-tool interface is slightly changed. The version number for the interface needs to be incremented. git-svn-id: svn://svn.valgrind.org/valgrind/trunk@7982
60 lines
2.1 KiB
C
60 lines
2.1 KiB
C
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/* This test case was originally written by Nicholas Nethercote. */
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// (old comments)
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// This file tests how many possible origins can be tracked for a single
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// error.
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// XXX: other files don't need to do have multiple origins for errors now,
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// thanks to this test...
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// (end of old comments)
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/* When compiled -O, this produces an executable which reports a
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single uninitialised value error, on the value handed to the exit()
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system call. Fair enough.
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An important question is: which of the origins is reported in the
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error? Well, considering that (1) m_execontext allocates ECUs
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(origin tags, basically) in increasing order, and (2) memcheck's
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instrumentation for dealing with two uninitialised sources simply
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involves 'max'-ing the otags, we expect the origin to be attributed
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to the last of the 8 mallocs, that is, to p_ui8.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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static int x = 0;
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int main(void)
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{
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// Do them separately rather than all in one array so they all have
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// different origins.
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int* p_ui1 = malloc(sizeof(int));
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int* p_ui2 = malloc(sizeof(int));
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int* p_ui3 = malloc(sizeof(int));
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int* p_ui4 = malloc(sizeof(int));
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int* p_ui5 = malloc(sizeof(int));
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int* p_ui6 = malloc(sizeof(int));
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int* p_ui7 = malloc(sizeof(int));
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int* p_ui8 = malloc(sizeof(int));
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int ui1 = *p_ui1;
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int ui2 = *p_ui2;
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int ui3 = *p_ui3;
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int ui4 = *p_ui4;
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int ui5 = *p_ui5;
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int ui6 = *p_ui6;
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int ui7 = *p_ui7;
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int ui8 = *p_ui8;
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x += (ui1 == 0x12345678 ? 12 : 23);
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x += (ui1 +ui2 == 0x12345678 ? 13 : 24);
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x += (ui1 +ui2 +ui3 == 0x12345678 ? 14 : 25);
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x += (ui1 +ui2 +ui3 +ui4 == 0x12345678 ? 15 : 26);
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x += (ui1 +ui2 +ui3 +ui4 +ui5 == 0x12345678 ? 16 : 27);
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x += (ui1 +ui2 +ui3 +ui4 +ui5 +ui6 == 0x12345678 ? 17 : 28);
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x += (ui1 +ui2 +ui3 +ui4 +ui5 +ui6 +ui7 == 0x12345678 ? 18 : 29);
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x += (ui1 +ui2 +ui3 +ui4 +ui5 +ui6 +ui7 +ui8 == 0x12345678 ? 19 : 30);
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return x & 1;
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}
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