glib配列が非初期化メモリを使用するのはなぜですか？

Question

私はGLibのからポインタ配列を使用して、おもちゃの機能を書いた：

#include <glib-2.0/glib.h> 
#include <stdio.h> 

void append_string(GArray* arr) { 
    g_array_append_vals(arr, "foo", 1); 
} 

int main() { 
    GPtrArray *arr = g_ptr_array_new(); 

    append_string((GArray*)arr); 

    g_ptr_array_free(arr, TRUE); 
    return 0; 
} 

しかし、valgrindのでこれを実行すると得られます。

==5876== Memcheck, a memory error detector 
==5876== Copyright (C) 2002-2015, and GNU GPL'd, by Julian Seward et al. 
==5876== Using Valgrind-3.11.0 and LibVEX; rerun with -h for copyright info 
==5876== Command: ./demo 
==5876== 
==5876== Conditional jump or move depends on uninitialised value(s) 
==5876== at 0x4E532E9: ??? (in /usr/lib/libglib-2.0.so.0.4800.0) 
==5876== by 0x4E536A7: g_array_append_vals (in /usr/lib/libglib-2.0.so.0.4800.0) 
==5876== by 0x400727: append_string (main_arrays.c:5) 
==5876== by 0x400747: main (main_arrays.c:11) 
==5876== 
==5876== Conditional jump or move depends on uninitialised value(s) 
==5876== at 0x4E532EE: ??? (in /usr/lib/libglib-2.0.so.0.4800.0) 
==5876== by 0x4E536A7: g_array_append_vals (in /usr/lib/libglib-2.0.so.0.4800.0) 
==5876== by 0x400727: append_string (main_arrays.c:5) 
==5876== by 0x400747: main (main_arrays.c:11) 
==5876== 
==5876== Conditional jump or move depends on uninitialised value(s) 
==5876== at 0x4E536C9: g_array_append_vals (in /usr/lib/libglib-2.0.so.0.4800.0) 
==5876== by 0x400727: append_string (main_arrays.c:5) 
==5876== by 0x400747: main (main_arrays.c:11) 
==5876== 
==5876== 
==5876== HEAP SUMMARY: 
==5876==  in use at exit: 18,604 bytes in 6 blocks 
==5876== total heap usage: 8 allocs, 2 frees, 18,652 bytes allocated 
==5876== 
==5876== LEAK SUMMARY: 
==5876== definitely lost: 0 bytes in 0 blocks 
==5876== indirectly lost: 0 bytes in 0 blocks 
==5876==  possibly lost: 0 bytes in 0 blocks 
==5876== still reachable: 18,604 bytes in 6 blocks 
==5876==   suppressed: 0 bytes in 0 blocks 
==5876== Rerun with --leak-check=full to see details of leaked memory 
==5876== 
==5876== For counts of detected and suppressed errors, rerun with: -v 
==5876== Use --track-origins=yes to see where uninitialised values come from 
==5876== ERROR SUMMARY: 3 errors from 3 contexts (suppressed: 0 from 0) 

私はAPIを悪用アム、これは、GLibのバグですまたはvalgrind間違っている？それはvalgrindの制限、私はこのvalgrindの警告を沈黙させることができますが、valgrindは私のコードの本物の問題について警告していますか？

Answer 1

GArrayおよびGPtrArrayは同等ではありません。同じパブリックフィールドを持っていても、ここではサブタイプはありません。代わりに

使用g_ptr_array_add：

void append_string(GPtrArray* arr) { 
    g_ptr_array_add(arr, "foo"); 
}