[Lldb-commits] [Bug 12882] New: Problems with structures defined with #pragma pack()

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=12882

             Bug #: 12882
           Summary: Problems with structures defined with #pragma pack()
           Product: lldb
           Version: unspecified
          Platform: PC
        OS/Version: MacOS X
            Status: NEW
          Severity: normal
          Priority: P
         Component: All Bugs
        AssignedTo: lldb-commits at cs.uiuc.edu
        ReportedBy: vadim at kalinsky.ru
    Classification: Unclassified


Here is the sample:

#pragma pack(push,1)
typedef struct MOVIentry {
    int32_t flags;
    int32_t size;
    int32_t pos;
    int32_t samplesInChunk;
    char    key_frame;
    int32_t entries;
    int64_t cts;
    int64_t dts;
} MOVIentry;
#pragma pack(pop)

int main()
{
    MOVIentry ee;
    ee.flags = 1;
    ee.size = 2;
    ee.pos = 3;
    ee.samplesInChunk = 4;
    ee.key_frame = 5;
    ee.entries = 6;
    ee.cts = 7;
    ee.dts = 8;

    unsigned long ee_size = sizeof(ee);

    return 0;
}

Memory for ee:
01 00 00 00 02 00 00 00 03 00 00 00 04 00 00 00 05 06 00 00 00 07 00 00 00 00
00 00 00 08 00 00 00 00 00 00 00 00 00 00

(lldb) expr -f hex -- ee.entries
(int32_t) $2 = 0x00000700

(lldb) expr sizeof(ee)
(unsigned long) $0 = 40

(lldb) expr ee_size
(unsigned long) $1 = 37

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