661660 - Add offset information for members of classes/structures in dehydra.

Status: RESOLVED WONTFIX

(Developer Infrastructure :: Source Code Analysis, enhancement)

Description

[[e-mail]]

User-Agent:       Mozilla/5.0 (X11; Linux i686; rv:2.0.1) Gecko/20100101 Firefox/4.0.1
Build Identifier: 

Packed, and unpacked variables can have different sizes, and different offset characteristics depending on a members attributes.  While this can manually be calculated, I feel dehydra should generate this data also.

Example:
struct test{
char a;
int b;
} __attribute__ ((packed));

struct test2{
char a;
int b;
};

sizeof(test) == 5
sizeof(test2) == 8

Makes it difficult to line up the addresses without re-parsing the data and looking for the packed field.


Reproducible: Always

Steps to Reproduce:
Example:
struct test{
char a;
int b;
} __attribute__ ((packed));

struct test2{
char a;
int b;
};

sizeof(test) == 5
sizeof(test2) == 8

Actual Results:  
PARAM: c
#1= {
    kind: "struct",
    name: "test",
    members: [{
        shortName: "a",
        name: "test::a",
        access: "public",
        memberOf: "See Type #1",
        type: #2={
            min: {
                value: "-128",
                type: "See Type #2"
            },
            max: {
                value: "127",
                type: "See Type #2"
            },
            isSigned: true,
            precision: 8,
            name: "char"
        },
        loc: {
            _source_location: 222,
            file: "/tmp/tmpHAWCbs.cpp",
            line: 2,
            column: 6
        }
    },
    {
        shortName: "b",
        name: "test::b",
        access: "public",
        memberOf: "See Type #1",
        type: #3={
            min: {
                value: "-2147483648",
                type: "See Type #3"
            },
            max: {
                value: "2147483647",
                type: "See Type #3"
            },
            isSigned: true,
            precision: 32,
            name: "int"
        },
        loc: {
            _source_location: 349,
            file: "/tmp/tmpHAWCbs.cpp",
            line: 3,
            column: 5
        }
    }],
    size_of: 5,
    loc: {
        _source_location: 100,
        file: "/tmp/tmpHAWCbs.cpp",
        line: 1,
        column: 12
    },
    attributes: [{
        name: "packed",
        value: []
    }]
}
PARAM: c
#1= {
    kind: "struct",
    name: "test2",
    members: [{
        shortName: "a",
        name: "test2::a",
        access: "public",
        memberOf: "See Type #1",
        type: #2={
            min: {
                value: "-128",
                type: "See Type #2"
            },
            max: {
                value: "127",
                type: "See Type #2"
            },
            isSigned: true,
            precision: 8,
            name: "char"
        },
        loc: {
            _source_location: 862,
            file: "/tmp/tmpHAWCbs.cpp",
            line: 7,
            column: 6
        }
    },
    {
        shortName: "b",
        name: "test2::b",
        access: "public",
        memberOf: "See Type #1",
        type: #3={
            min: {
                value: "-2147483648",
                type: "See Type #3"
            },
            max: {
                value: "2147483647",
                type: "See Type #3"
            },
            isSigned: true,
            precision: 32,
            name: "int"
        },
        loc: {
            _source_location: 989,
            file: "/tmp/tmpHAWCbs.cpp",
            line: 8,
            column: 5
        }
    }],
    size_of: 8,
    loc: {
        _source_location: 741,
        file: "/tmp/tmpHAWCbs.cpp",
        line: 6,
        column: 13
    }
}

Expected Results:  
shortName: "a",
offset = 0x0,

shortName: "b",
offset = 0x1 or offset = 0x4

Comment 1

[Joshua Cranmer [:jcranmer]]

Dehydra and treehydra are no longer maintained by Mozilla.