Assume all your passes are wrong and have never been proven. The idea is to find failures before someone else does, pass fail at the smallest scale first, and snowball into catastrophic behaviours...
Optimization passes transform IR into a simpler, more canonical form without altering program semantics. The core philosophy of a pass is to reduce code and expressions to their minimal canonical f...
Now that the IR is ready to go, we can begin transforming it into readable code. Pass Methodology This chapter and the preceding chapters (up to the final one) define transformation passes. Each ...
Edge-Cases Sometimes your IL will contain abstract functions that do not map 1:1 to the IR. These should be handled by flagging them while remaining as descriptive as possible. The best approach, ...
The purpose of the IL is to simplify lifting from different architectures into the IR. An added benefit is that it enables a multi-architecture decompiler: only one lifting pipeline is needed to s...
Intermediate Representation (IR) is a way of representing programs in a common abstract format. It differs from an Abstract Syntax Tree (AST). While both represent program structure, an AST reflec...
Pipeline Lifting is the process of translating machine instructions into IL instructions while preserving semantics. A typical lifting process follows these steps: Dissassemble the instruction...
Before you start reading, ask yourself: how do we take machine code from different architectures and transform it into a common representation that preserves program behavior as accurately as possi...
To stress-test the process, I have included this program, which includes: State-dependent control flow with continuously mutating variables Mixed arithmetic and bitwise operations (XOR, shifts...
#include <stdint.h> volatile int32_t sink; typedef struct { int32_t a; int32_t b; int32_t c; } Node; int32_t func(int32_t *arr, const Node *n, const int32_t x) { int32_t acc = 0; ...