1   #include <iostream>
2   using namespace std;
3   int main(){
4      char* str1="four";
5      char* str2=new char[4]; //not enough space
6      char* str3=str2;
7      cout<<str2<<endl;    //UMR
8      strcpy(str2,str1);   //ABW
9      cout<<str2<<endl;  //ABR
10     delete str2;
11     str2[0]+=2;    //FMR and FMW
12     delete str3; //FFM
13   }

        CC=purify gcc
all: pplusdemo
pplusdemo: pplusdemo.o$(CC) -o pplusdemo pplusdemo.o -lstdc++
pplusdemo.o: pplusdemo.cpp$(CC) -g -c -w pplusdemo.cpp
clean:-rm pplusdemo pplusdemo.o

    ****  Purify instrumented ./pplusdemo (pid 30669)  ****
UMR: Uninitialized memory read:* This is occurring while in:strlen         [rtlib.o]std::basic_ostream< char,std::char_traits< char>> & std::operator<<<std::char_traits< char>>(std::basic_ostream< char,std::char_traits<char>> &, char const *) [libstdc++.so.5]main           [pplusdemo.cpp:7]__libc_start_main [libc.so.6]_start         [crt1.o]* Reading 1 byte from 0x80b45e0 in the heap.* Address 0x80b45e0 is at the beginning of a malloc'd block of 4 bytes.* This block was allocated from:malloc         [rtlib.o]operator new( unsigned) [libstdc++.so.5]operator new []( unsigned) [libstdc++.so.5]main           [pplusdemo.cpp:5]__libc_start_main [libc.so.6]_start         [crt1.o]
****  Purify instrumented ./pplusdemo (pid 30669)  ****
ABW: Array bounds write:* This is occurring while in:strcpy         [rtlib.o]main           [pplusdemo.cpp:8]__libc_start_main [libc.so.6]_start         [crt1.o]* Writing 5 bytes to 0x80b45e0 in the heap (1 byte at 0x80b45e4 illegal).* Address 0x80b45e0 is at the beginning of a malloc'd block of 4 bytes.* This block was allocated from:malloc         [rtlib.o]operator new( unsigned) [libstdc++.so.5]operator new []( unsigned) [libstdc++.so.5]main           [pplusdemo.cpp:5]__libc_start_main [libc.so.6]_start         [crt1.o]
****  Purify instrumented ./pplusdemo (pid 30669)  ****
ABR: Array bounds read:* This is occurring while in:strlen         [rtlib.o]std::basic_ostream< char,std::char_traits< char>> & std::operator<<<std::char_traits< char>>(std::basic_ostream< char,std::char_traits<char>> &, char const *) [libstdc++.so.5]main           [pplusdemo.cpp:9]__libc_start_main [libc.so.6]_start         [crt1.o]* Reading 5 bytes from 0x80b45e0 in the heap (1 byte at 0x80b45e4 illegal).* Address 0x80b45e0 is at the beginning of a malloc'd block of 4 bytes.* This block was allocated from:malloc         [rtlib.o]operator new( unsigned) [libstdc++.so.5]operator new []( unsigned) [libstdc++.so.5]main           [pplusdemo.cpp:5]__libc_start_main [libc.so.6]_start         [crt1.o]
****  Purify instrumented ./pplusdemo (pid 30669)  ****
FMM: Freeing mismatched memory:* This is occurring while in:operator delete( void *) [rtlib.o]main           [pplusdemo.cpp:10]__libc_start_main [libc.so.6]_start         [crt1.o]* Attempting to free block at 0x80b45e0 in the heap.* Address 0x80b45e0 is at the beginning of a malloc'd block of 4 bytes.* This block was allocated from:malloc         [rtlib.o]operator new( unsigned) [libstdc++.so.5]operator new []( unsigned) [libstdc++.so.5]main           [pplusdemo.cpp:5]__libc_start_main [libc.so.6]_start         [crt1.o]* This block of memory was obtained using an allocation routine which isnot compatible with the routine by which it is being freed.
****  Purify instrumented ./pplusdemo (pid 30669)  ****
FMR: Free memory read:* This is occurring while in:main           [pplusdemo.cpp:11]__libc_start_main [libc.so.6]_start         [crt1.o]* Reading 1 byte from 0x80b45e0 in the heap.* Address 0x80b45e0 is at the beginning of a freed block of 4 bytes.* This block was allocated from:malloc         [rtlib.o]operator new( unsigned) [libstdc++.so.5]operator new []( unsigned) [libstdc++.so.5]main           [pplusdemo.cpp:5]__libc_start_main [libc.so.6]_start         [crt1.o]* There have been 0 frees since this block was freed from:free           [rtlib.o]_ZdLpV         [libstdc++.so.5]main           [pplusdemo.cpp:10]__libc_start_main [libc.so.6]_start         [crt1.o]
****  Purify instrumented ./pplusdemo (pid 30669)  ****
FMW: Free memory write:* This is occurring while in:main           [pplusdemo.cpp:11]__libc_start_main [libc.so.6]_start         [crt1.o]* Writing 1 byte to 0x80b45e0 in the heap.* Address 0x80b45e0 is at the beginning of a freed block of 4 bytes.* This block was allocated from:malloc         [rtlib.o]operator new( unsigned) [libstdc++.so.5]operator new []( unsigned) [libstdc++.so.5]main           [pplusdemo.cpp:5]__libc_start_main [libc.so.6]_start         [crt1.o]* There have been 0 frees since this block was freed from:free           [rtlib.o]_ZdLpV         [libstdc++.so.5]main           [pplusdemo.cpp:10]__libc_start_main [libc.so.6]_start         [crt1.o]
****  Purify instrumented ./pplusdemo (pid 30669)  ****
FUM: Freeing unallocated memory:* This is occurring while in:free           [rtlib.o]_ZdLpV         [libstdc++.so.5]main           [pplusdemo.cpp:12]__libc_start_main [libc.so.6]_start         [crt1.o]* Attempting to free block at 0x80b45e0 already freed.* This block was allocated from:malloc         [rtlib.o]operator new( unsigned) [libstdc++.so.5]operator new []( unsigned) [libstdc++.so.5]main           [pplusdemo.cpp:5]__libc_start_main [libc.so.6]_start         [crt1.o]* There have been 1 frees since this block was freed from:free           [rtlib.o]_ZdLpV         [libstdc++.so.5]main           [pplusdemo.cpp:10]__libc_start_main [libc.so.6]_start         [crt1.o]
****  Purify instrumented ./pplusdemo (pid 30669)  ****
Current file descriptors in use: 5
FIU: file descriptor 0: <stdin>
FIU: file descriptor 1: <stdout>
FIU: file descriptor 2: <stderr>
FIU: file descriptor 26: <reserved for Purify internal use>
FIU: file descriptor 27: <reserved for Purify internal use>
****  Purify instrumented ./pplusdemo (pid 30669)  ****
Purify: Searching for all memory leaks...
Memory leaked: 0 bytes (0%); potentially leaked: 0 bytes (0%)
Purify Heap Analysis (combining suppressed and unsuppressed blocks)Blocks        BytesLeaked          0            0Potentially Leaked          0            0In-Use          0            0----------------------------------------Total Allocated          0            0
****  Purify instrumented ./pplusdemo (pid 30669)  ***** Program exited with status code 0.* 7 access errors, 7 total occurrences.* 0 bytes leaked.* 0 bytes potentially leaked.* Basic memory usage (including Purify overhead):290012 code152928 data/bss6816 heap (peak use)7800 stack