rapx/analysis/core/range_analysis/domain/SymbolicExpr.rs
1#![allow(unused_imports)]
2#![allow(unused_variables)]
3#![allow(dead_code)]
4#![allow(unused_assignments)]
5use std::{
6 collections::HashMap,
7 default,
8 fmt::{self, *},
9};
10
11use bounds::Bound;
12use intervals::*;
13use num_traits::{Bounded, Num, Zero};
14use rustc_ast::token::TokenKind::Plus;
15use rustc_hir::def_id::DefId;
16use rustc_middle::{mir::*, ty::Ty};
17use rustc_public::mir::NullOp;
18use std::ops::{Add, Mul, Sub};
19
20use crate::{
21 analysis::core::range_analysis::domain::domain::{ConstConvert, IntervalArithmetic},
22 rap_trace,
23};
24#[derive(Debug, Clone, PartialEq, Eq)]
25pub enum UnknownReason {
26 CyclicDependency,
27 CannotParse,
28 Unsupported,
29}
30
31#[derive(Debug, Clone, PartialEq, Eq)]
32pub enum VarorConst<'tcx> {
33 Place(Place<'tcx>),
34 Constant(Const<'tcx>),
35}
36#[derive(Debug, Clone, PartialEq, Eq)]
37pub enum SymbolicExpr<'tcx> {
38 Argument(Place<'tcx>),
39 Constant(Const<'tcx>),
40 BinaryOp {
41 op: BinOp,
42 left: Box<SymbolicExpr<'tcx>>,
43 right: Box<SymbolicExpr<'tcx>>,
44 },
45 UnaryOp {
46 op: UnOp,
47 operand: Box<SymbolicExpr<'tcx>>,
48 },
49 Cast {
50 kind: CastKind,
51 operand: Box<SymbolicExpr<'tcx>>,
52 target_ty: Ty<'tcx>,
53 },
54 Ref {
55 kind: BorrowKind,
56 place_expr: Box<SymbolicExpr<'tcx>>,
57 },
58 AddressOf {
59 mutability: RawPtrKind,
60 place_expr: Box<SymbolicExpr<'tcx>>,
61 },
62 Deref(Box<SymbolicExpr<'tcx>>),
63 Len(Box<SymbolicExpr<'tcx>>),
64 Aggregate {
65 kind: Box<AggregateKind<'tcx>>,
66 fields: Vec<SymbolicExpr<'tcx>>,
67 },
68 Repeat {
69 value: Box<SymbolicExpr<'tcx>>,
70 count: Const<'tcx>,
71 },
72 Index {
73 base: Box<SymbolicExpr<'tcx>>,
74 index: Box<SymbolicExpr<'tcx>>,
75 },
76 Ssa(Vec<SymbolicExpr<'tcx>>),
77 Essa {
78 operand: Box<SymbolicExpr<'tcx>>,
79 constraint_operand: VarorConst<'tcx>,
80 bin_op: BinOp,
81 },
82 Discriminant(Box<SymbolicExpr<'tcx>>),
83 NullaryOp(NullOp),
84 ThreadLocalRef(DefId),
85 Unknown(UnknownReason),
86}
87
88impl<'tcx> fmt::Display for SymbolicExpr<'tcx> {
89 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
90 match self {
91 SymbolicExpr::Argument(i) => write!(f, "arg{:?}", i),
92 SymbolicExpr::Constant(c) => write!(f, "{}", c),
93 SymbolicExpr::BinaryOp { op, left, right } => {
94 let op_str = match op {
95 BinOp::Add => "+",
96 BinOp::Sub => "-",
97 BinOp::Mul => "*",
98 BinOp::Div => "/",
99 BinOp::Rem => "%",
100 BinOp::BitXor => "^",
101 BinOp::BitAnd => "&",
102 BinOp::BitOr => "|",
103 BinOp::Shl => "<<",
104 BinOp::Shr => ">>",
105 BinOp::Eq => "==",
106 BinOp::Lt => "<",
107 BinOp::Le => "<=",
108 BinOp::Ne => "!=",
109 BinOp::Ge => ">=",
110 BinOp::Gt => ">",
111 BinOp::Offset => "offset",
112 BinOp::AddUnchecked => "+",
113 BinOp::AddWithOverflow => "+",
114 BinOp::SubUnchecked => "-",
115 BinOp::SubWithOverflow => "-",
116 BinOp::MulUnchecked => "*",
117 BinOp::MulWithOverflow => "*",
118 BinOp::ShlUnchecked => "<<",
119 BinOp::ShrUnchecked => ">>",
120 BinOp::Cmp => "cmp", // Added Cmp
121 };
122 write!(f, "({} {} {})", left, op_str, right)
123 }
124 SymbolicExpr::UnaryOp { op, operand } => {
125 let op_str = match op {
126 UnOp::Not => "!",
127 UnOp::Neg => "-",
128 UnOp::PtrMetadata => "ptr_metadata", // Added PtrMetadata
129 };
130 write!(f, "({}{})", op_str, operand)
131 }
132 SymbolicExpr::Cast {
133 operand, target_ty, ..
134 } => write!(f, "({} as {})", operand, target_ty),
135 SymbolicExpr::Ref { kind, place_expr } => match kind {
136 BorrowKind::Shared => write!(f, "&{}", place_expr),
137 BorrowKind::Mut { .. } => write!(f, "&mut {}", place_expr),
138 BorrowKind::Fake(..) => write!(f, "&shallow {}", place_expr),
139 },
140 SymbolicExpr::AddressOf {
141 mutability,
142 place_expr,
143 } => match mutability {
144 RawPtrKind::Const => write!(f, "&raw const {}", place_expr),
145 RawPtrKind::Mut => write!(f, "&raw mut {}", place_expr),
146 RawPtrKind::FakeForPtrMetadata => {
147 write!(f, "&raw FakeForPtrMetadata {}", place_expr)
148 }
149 },
150 SymbolicExpr::Deref(expr) => write!(f, "*({})", expr),
151 SymbolicExpr::Len(expr) => write!(f, "len({})", expr),
152 SymbolicExpr::Aggregate { kind, fields } => {
153 let parts: Vec<String> = fields.iter().map(|e| e.to_string()).collect();
154 match **kind {
155 AggregateKind::Tuple => write!(f, "({})", parts.join(", ")),
156 AggregateKind::Array(_) => write!(f, "[{}]", parts.join(", ")),
157 AggregateKind::Adt(def_id, ..) => write!(f, "{:?}{{..}}", def_id),
158 _ => write!(f, "aggr({})", parts.join(", ")),
159 }
160 }
161 SymbolicExpr::Repeat { value, count } => write!(f, "[{}; {}]", value, count),
162 SymbolicExpr::Index { base, index } => write!(f, "{}[{}]", base, index),
163 SymbolicExpr::Ssa(operands) => {
164 let parts: Vec<String> = operands.iter().map(|e| e.to_string()).collect();
165 write!(f, "SSA({})", parts.join(", "))
166 }
167 SymbolicExpr::Essa {
168 operand,
169 constraint_operand,
170 bin_op,
171 } => {
172 let op_str = match bin_op {
173 BinOp::Eq => "==",
174 BinOp::Lt => "<",
175 BinOp::Le => "<=",
176 BinOp::Ne => "!=",
177 BinOp::Ge => ">=",
178 BinOp::Gt => ">",
179 _ => "??", // Non-comparison ops in constraint
180 };
181 write!(
182 f,
183 "ESSA({}, {} {} {})",
184 operand, operand, op_str, constraint_operand
185 )
186 }
187 SymbolicExpr::Discriminant(expr) => write!(f, "discriminant({})", expr),
188 SymbolicExpr::NullaryOp(op) => write!(f, "{:?}", op),
189 SymbolicExpr::ThreadLocalRef(def_id) => write!(f, "tls_{:?}", def_id),
190 SymbolicExpr::Unknown(reason) => write!(f, "{{{:?}}}", reason),
191 }
192 }
193}
194
195impl<'tcx> fmt::Display for VarorConst<'tcx> {
196 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
197 match self {
198 VarorConst::Place(p) => write!(f, "{:?}", p),
199 VarorConst::Constant(c) => write!(f, "{}", c),
200 }
201 }
202}
203// pub struct SymbolicExprEvaluator<'tcx, T: IntervalArithmetic + ConstConvert + Debug> {
204// /// 环境：将 Place 映射到其当前的 Range<T> 值
205// /// 注意：这里传入的是 HashMap，因为在实际分析中，Place 的值是动态变化的。
206// /// 这个 Evaluator 只是一个静态的计算器，给定一个环境就计算一次。
207// env: &'tcx HashMap<&'tcx Place<'tcx>, Range<T>>,
208// /// 用于类型推断或常量评估的类型上下文，如果需要的话
209// // tcx: TyCtxt<'tcx>, // 如果某些 Const<'tcx> 评估需要 TyCtxt，则取消注释
210// }
211
212// impl<'tcx, T> SymbolicExprEvaluator<'tcx, T>
213// where
214// T: IntervalArithmetic + ConstConvert + Debug,
215// {
216// /// 创建一个新的 SymbolicExprEvaluator 实例
217// pub fn new(env: &'tcx HashMap<&'tcx Place<'tcx>, Range<T>>) -> Self {
218// Self {
219// env,
220// // tcx, // 如果需要，在此处传入
221// }
222// }
223
224// /// 评估给定的 SymbolicExpr，返回一个 Range<T>
225// pub fn evaluate(&self, expr: &SymbolicExpr<'tcx>) -> Range<T> {
226// match expr {
227// SymbolicExpr::Argument(place) => {
228// // 函数参数：从环境中查找其区间
229// self.env.get(place)
230// .cloned()
231// .unwrap_or_else(|| {
232// rap_trace!("Warning: Argument {:?} not found in environment. Assuming full range.", place);
233// Range::default(T::min_value()) // 默认返回一个未知或全范围区间
234// })
235// }
236// SymbolicExpr::Constant(c) => {
237// // 常量：转换为 Range<T>
238// if let Some(val) = T::from_const(c) {
239// Range::new(val.clone(), val, range::RangeType)
240// } else {
241// rap_trace!("Warning: Cannot convert constant {:?} to type T. Returning full range.", c);
242// Range::default(T::min_value()) // 无法转换时返回全范围
243// }
244// }
245// SymbolicExpr::BinaryOp { op, left, right } => {
246// // 二元操作：递归评估左右操作数，然后执行区间运算
247// let left_range = self.evaluate(left);
248// let right_range = self.evaluate(right);
249
250// match op {
251// BinOp::Add | BinOp::AddUnchecked | BinOp::AddWithOverflow => left_range.add(&right_range),
252// BinOp::Sub | BinOp::SubUnchecked | BinOp::SubWithOverflow => left_range.sub(&right_range),
253// BinOp::Mul | BinOp::MulUnchecked | BinOp::MulWithOverflow => left_range.mul(&right_range),
254// BinOp::Div => left_range.div(&right_range),
255// BinOp::Rem => left_range.rem(&right_range),
256// BinOp::BitXor => left_range.bitxor(&right_range),
257// BinOp::BitAnd => left_range.bitand(&right_range),
258// BinOp::BitOr => left_range.bitor(&right_range),
259// BinOp::Shl | BinOp::ShlUnchecked => left_range.shl(&right_range), // 注意：位移操作的右操作数通常是整数
260// BinOp::Shr | BinOp::ShrUnchecked => left_range.shr(&right_range), // 同上
261
262// // 比较操作通常返回布尔值，但在区间分析中，它们用于生成新的区间约束
263// // 这里简化处理，直接返回全范围，或者根据需要实现更复杂的行为
264// BinOp::Eq | BinOp::Lt | BinOp::Le | BinOp::Ne | BinOp::Ge | BinOp::Gt => {
265// rap_trace!("Warning: Comparison operator {:?} in symbolic expression. Returning full range as range analysis for comparisons typically involves conditional updates, not direct evaluation to a single range.", op);
266// Range::default(T::min_value()) // 比较操作通常不直接产生一个数值区间
267// },
268// // Offset 通常用于指针算术，其数值行为复杂，返回全范围
269// BinOp::Offset => {
270// rap_trace!("Warning: Offset operator in symbolic expression. Returning full range.",);
271// Range::default(T::min_value())
272// },
273// BinOp::Cmp => { // 比较，通常返回 Ordering
274// rap_trace!("Warning: Cmp operator in symbolic expression. Returning full range.",);
275// Range::default(T::min_value())
276// }
277// }
278// }
279// SymbolicExpr::UnaryOp { op, operand } => {
280// // 一元操作：递归评估操作数，然后执行区间运算
281// let operand_range = self.evaluate(operand);
282// match op {
283// UnOp::Neg => operand_range.neg(),
284// UnOp::Not => operand_range.not(), // 逻辑非或位非，取决于T的实现
285// UnOp::PtrMetadata => {
286// rap_trace!("Warning: PtrMetadata operator in symbolic expression. Returning full range.",);
287// Range::default(T::min_value())
288// }
289// }
290// }
291// SymbolicExpr::Cast { kind, operand, target_ty } => {
292// // 类型转换：评估操作数，然后尝试转换区间
293// let operand_range = self.evaluate(operand);
294// // 简单的类型转换：保留原区间，但标记为不精确。
295// // 复杂的数值截断、符号扩展等需要更复杂的逻辑，可能需要 TyCtxt。
296// // 这里我们假设 T 的 IntervalArithmetic 能够处理不同大小整数的 Min/Max。
297// rap_trace!("Warning: Cast operator {:?} to {:?} in symbolic expression. Returning original range as is for simplicity, assuming T handles potential overflows/underflows implicitly via its min/max.", kind, target_ty);
298// // 实际的类型转换需要更多关于类型的信息，这里只是一个保守的估计
299// // 更精确的实现会根据 target_ty 的位宽和有无符号性来调整区间边界
300// operand_range
301// }
302// SymbolicExpr::Deref(expr) => {
303// // 解引用：通常表示访问内存位置。其值范围取决于该内存位置的内容。
304// // 在没有具体内存模型的情况下，无法计算。
305// rap_trace!("Warning: Deref operator in symbolic expression. Returning full range.",);
306// Range::default(T::min_value())
307// }
308// SymbolicExpr::Len(expr) => {
309// // 长度：通常是一个非负整数。但具体长度未知。
310// rap_trace!("Warning: Len operator in symbolic expression. Returning positive integer range.",);
311// Range::new(T::zero(), T::max_value(), range::RangeType) // 至少为0
312// }
313// SymbolicExpr::Index { base, index } => {
314// // 索引访问：访问数组/切片元素。
315// // 其值范围取决于数组/切片中所有元素的可能范围，以及索引的范围。
316// rap_trace!("Warning: Index operator in symbolic expression. Returning full range.",);
317// Range::default(T::min_value())
318// }
319// // 对于以下复杂或无法直接映射到数值区间的操作，返回全范围 (Unknown)
320// SymbolicExpr::Ref { .. } |
321// SymbolicExpr::AddressOf { .. } |
322// SymbolicExpr::Aggregate { .. } |
323// SymbolicExpr::Repeat { .. } |
324// SymbolicExpr::Discriminant { .. } |
325// SymbolicExpr::NullaryOp { .. } |
326// SymbolicExpr::ThreadLocalRef { .. } => {
327// rap_trace!("Warning: Complex/unsupported symbolic expression type {:?}. Returning full range.", expr);
328// Range::default(T::min_value())
329// }
330// SymbolicExpr::Unknown(reason) => {
331// // 表达式本身就是未知，结果也是未知
332// rap_trace!("Warning: Symbolic expression is Unknown due to reason {:?}. Propagating Unknown range.", reason);
333// Range::default(T::min_value())
334// }
335// }
336// }
337// }