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Reconstructing Bitfield structs and Union types in IDA Pro Local Types

vtable_slayer
Senior Reverser
MEMBER
Rep: 215
Datum pridruživanja: Mar 2018
Postovi: 86
Hvala: 61
3 prije tjedana · Jul 30, 2026 3:29 AM
#1

How to define bitfield flags properly in IDA C-Header parser (Shift+F1):

CPP
struct PlayerFlags_t {
    uint32_t onGround     : 1;
    uint32_t isDucking    : 1;
    uint32_t isWaterJump  : 1;
    uint32_t onTrain      : 1;
    uint32_t inRain       : 1;
    uint32_t frozen       : 1;
    uint32_t atControls   : 1;
    uint32_t isClient     : 1;
    uint32_t fakeClient   : 1;
    uint32_t inWater      : 1;
    uint32_t unused       : 22;
};

IDA Decompiler now transforms messy bitwise operations (if ((v12 >> 1) & 1)) into clean human-readable field checks (if (v12.isDucking))!

ida_ast_hacker
Microcode Dev
MEMBER
Rep: 74
Datum pridruživanja: Nov 2022
Postovi: 6
Hvala: 48
3 prije tjedana · Jul 30, 2026 5:31 AM
#2

Bitfields in Local Types clean up decompiler output tremendously. Essential tip.

ghidra_pcode_pro
RE Specialist
MEMBER
Rep: 63
Datum pridruživanja: Nov 2021
Postovi: 11
Hvala: 57
3 prije tjedana · Jul 30, 2026 5:47 PM
#3

Makes reversed code look like original studio source code.