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Fix assert for who_points_at monitor cmd for an interiorly pointed block

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* fix the assert
* some better comments
* update test to verify who_points_at behaviour with an interiorly pointed block



git-svn-id: svn://svn.valgrind.org/valgrind/trunk@13609
This commit is contained in:
Philippe Waroquiers
2013-10-02 20:59:05 +00:00
parent e9b1e99239
commit fa45410976
5 changed files with 28 additions and 7 deletions
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11
memcheck/tests/leak_cpp_interior.cpp
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@@ -1,10 +1,10 @@
#include <stdio.h>
#include <unistd.h>
#include <string>
#include <sstream>
#include "../memcheck.h"
// Derived from test provided by Timur Iskhodzhanov (bug 280271)
class MyClass
{
public:
@@ -74,12 +74,18 @@ Ae *ptrACe;
B *ptrBC;
A *ptrAC;
char who_points_at_cmd[100];
void doit(void)
{
str = "Valgrind"; // interior ptr.
str2 = str;
ptr = new MyClass[3]; // interior ptr.
// prepare the who_points_at cmd we will run.
// Do it here to avoid having ptr or its exterior ptr kept in a register.
sprintf(who_points_at_cmd, "who_points_at %p 20", (char*)ptr - sizeof(void*));
ptr2 = new MyClass[0]; // "interior but exterior ptr".
// ptr2 points after the chunk, is wrongly considered by memcheck as definitely leaked.
@@ -109,6 +115,9 @@ int main() {
fprintf(stderr, "leak_check summary heuristics stdstring\n");
(void) VALGRIND_MONITOR_COMMAND("leak_check summary heuristics stdstring");
// Test the who_points_at when the block is pointed to with an interior ptr.
(void) VALGRIND_MONITOR_COMMAND(who_points_at_cmd);
delete [] ptr;
delete [] ptr2;
delete ptrBCe;