Mercurial > hg
annotate rust/hg-cpython/src/ref_sharing.rs @ 42888:67853749961b
rust-cpython: replace dyn Iterator<..> of mapping with concrete type
See the previous commit for why. The docstring is moved accordingly.
author | Yuya Nishihara <yuya@tcha.org> |
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date | Sun, 08 Sep 2019 12:23:18 +0900 |
parents | 706104dcb2c8 |
children | ea91a126c803 |
rev | line source |
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1 // macros.rs |
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2 // |
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3 // Copyright 2019 Raphaël Gomès <rgomes@octobus.net> |
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4 // |
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5 // This software may be used and distributed according to the terms of the |
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6 // GNU General Public License version 2 or any later version. |
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7 |
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8 //! Macros for use in the `hg-cpython` bridge library. |
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9 |
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10 use crate::exceptions::AlreadyBorrowed; |
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11 use cpython::{PyResult, Python}; |
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12 use std::cell::{Cell, Ref, RefCell, RefMut}; |
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13 |
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14 /// Manages the shared state between Python and Rust |
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15 #[derive(Default)] |
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16 pub struct PySharedState { |
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17 leak_count: Cell<usize>, |
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18 mutably_borrowed: Cell<bool>, |
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19 } |
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20 |
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21 impl PySharedState { |
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22 pub fn borrow_mut<'a, T>( |
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23 &'a self, |
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24 py: Python<'a>, |
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25 pyrefmut: RefMut<'a, T>, |
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26 ) -> PyResult<PyRefMut<'a, T>> { |
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27 if self.mutably_borrowed.get() { |
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28 return Err(AlreadyBorrowed::new( |
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29 py, |
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30 "Cannot borrow mutably while there exists another \ |
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31 mutable reference in a Python object", |
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32 )); |
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33 } |
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34 match self.leak_count.get() { |
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35 0 => { |
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36 self.mutably_borrowed.replace(true); |
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37 Ok(PyRefMut::new(py, pyrefmut, self)) |
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38 } |
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39 // TODO |
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40 // For now, this works differently than Python references |
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41 // in the case of iterators. |
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42 // Python does not complain when the data an iterator |
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43 // points to is modified if the iterator is never used |
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44 // afterwards. |
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45 // Here, we are stricter than this by refusing to give a |
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46 // mutable reference if it is already borrowed. |
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47 // While the additional safety might be argued for, it |
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48 // breaks valid programming patterns in Python and we need |
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49 // to fix this issue down the line. |
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50 _ => Err(AlreadyBorrowed::new( |
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51 py, |
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52 "Cannot borrow mutably while there are \ |
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53 immutable references in Python objects", |
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54 )), |
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55 } |
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56 } |
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57 |
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58 /// Return a reference to the wrapped data with an artificial static |
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59 /// lifetime. |
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60 /// We need to be protected by the GIL for thread-safety. |
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61 /// |
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62 /// # Safety |
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63 /// |
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64 /// This is highly unsafe since the lifetime of the given data can be |
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65 /// extended. Do not call this function directly. |
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66 pub unsafe fn leak_immutable<T>( |
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67 &self, |
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68 py: Python, |
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69 data: &PySharedRefCell<T>, |
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70 ) -> PyResult<&'static T> { |
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71 if self.mutably_borrowed.get() { |
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72 return Err(AlreadyBorrowed::new( |
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73 py, |
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74 "Cannot borrow immutably while there is a \ |
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75 mutable reference in Python objects", |
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76 )); |
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77 } |
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78 let ptr = data.as_ptr(); |
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79 self.leak_count.replace(self.leak_count.get() + 1); |
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80 Ok(&*ptr) |
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81 } |
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82 |
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83 /// # Safety |
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84 /// |
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85 /// It's unsafe to update the reference count without knowing the |
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86 /// reference is deleted. Do not call this function directly. |
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87 pub unsafe fn decrease_leak_count(&self, _py: Python, mutable: bool) { |
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88 self.leak_count |
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89 .replace(self.leak_count.get().saturating_sub(1)); |
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90 if mutable { |
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91 self.mutably_borrowed.replace(false); |
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92 } |
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93 } |
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94 } |
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95 |
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96 /// `RefCell` wrapper to be safely used in conjunction with `PySharedState`. |
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97 /// |
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98 /// Only immutable operation is allowed through this interface. |
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99 #[derive(Debug)] |
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100 pub struct PySharedRefCell<T> { |
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101 inner: RefCell<T>, |
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102 } |
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103 |
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104 impl<T> PySharedRefCell<T> { |
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105 pub const fn new(value: T) -> PySharedRefCell<T> { |
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106 Self { |
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107 inner: RefCell::new(value), |
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108 } |
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109 } |
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110 |
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111 pub fn borrow(&self) -> Ref<T> { |
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112 // py_shared_state isn't involved since |
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113 // - inner.borrow() would fail if self is mutably borrowed, |
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114 // - and inner.borrow_mut() would fail while self is borrowed. |
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115 self.inner.borrow() |
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116 } |
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117 |
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118 pub fn as_ptr(&self) -> *mut T { |
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119 self.inner.as_ptr() |
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120 } |
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121 |
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122 pub unsafe fn borrow_mut(&self) -> RefMut<T> { |
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123 // must be borrowed by self.py_shared_state(py).borrow_mut(). |
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124 self.inner.borrow_mut() |
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125 } |
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126 } |
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127 |
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128 /// Holds a mutable reference to data shared between Python and Rust. |
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129 pub struct PyRefMut<'a, T> { |
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130 inner: RefMut<'a, T>, |
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131 py_shared_state: &'a PySharedState, |
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132 } |
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133 |
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134 impl<'a, T> PyRefMut<'a, T> { |
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135 // Must be constructed by PySharedState after checking its leak_count. |
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136 // Otherwise, drop() would incorrectly update the state. |
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137 fn new( |
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138 _py: Python<'a>, |
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139 inner: RefMut<'a, T>, |
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140 py_shared_state: &'a PySharedState, |
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141 ) -> Self { |
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142 Self { |
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143 inner, |
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144 py_shared_state, |
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145 } |
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146 } |
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147 } |
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148 |
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149 impl<'a, T> std::ops::Deref for PyRefMut<'a, T> { |
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150 type Target = RefMut<'a, T>; |
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151 |
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152 fn deref(&self) -> &Self::Target { |
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153 &self.inner |
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154 } |
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155 } |
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156 impl<'a, T> std::ops::DerefMut for PyRefMut<'a, T> { |
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157 fn deref_mut(&mut self) -> &mut Self::Target { |
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158 &mut self.inner |
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159 } |
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160 } |
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161 |
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162 impl<'a, T> Drop for PyRefMut<'a, T> { |
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163 fn drop(&mut self) { |
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164 let gil = Python::acquire_gil(); |
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165 let py = gil.python(); |
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166 unsafe { |
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167 self.py_shared_state.decrease_leak_count(py, true); |
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168 } |
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169 } |
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170 } |
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171 |
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172 /// Allows a `py_class!` generated struct to share references to one of its |
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173 /// data members with Python. |
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174 /// |
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175 /// # Warning |
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176 /// |
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177 /// The targeted `py_class!` needs to have the |
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178 /// `data py_shared_state: PySharedState;` data attribute to compile. |
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179 /// A better, more complicated macro is needed to automatically insert it, |
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180 /// but this one is not yet really battle tested (what happens when |
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181 /// multiple references are needed?). See the example below. |
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182 /// |
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183 /// TODO allow Python container types: for now, integration with the garbage |
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184 /// collector does not extend to Rust structs holding references to Python |
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185 /// objects. Should the need surface, `__traverse__` and `__clear__` will |
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186 /// need to be written as per the `rust-cpython` docs on GC integration. |
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187 /// |
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188 /// # Parameters |
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189 /// |
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190 /// * `$name` is the same identifier used in for `py_class!` macro call. |
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191 /// * `$inner_struct` is the identifier of the underlying Rust struct |
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192 /// * `$data_member` is the identifier of the data member of `$inner_struct` |
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193 /// that will be shared. |
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194 /// * `$leaked` is the identifier to give to the struct that will manage |
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195 /// references to `$name`, to be used for example in other macros like |
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196 /// `py_shared_iterator_impl`. |
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197 /// |
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198 /// # Example |
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199 /// |
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200 /// ``` |
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201 /// struct MyStruct { |
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202 /// inner: Vec<u32>; |
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203 /// } |
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204 /// |
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205 /// py_class!(pub class MyType |py| { |
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206 /// data inner: PySharedRefCell<MyStruct>; |
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207 /// data py_shared_state: PySharedState; |
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208 /// }); |
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209 /// |
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210 /// py_shared_ref!(MyType, MyStruct, inner, MyTypeLeakedRef); |
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211 /// ``` |
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212 macro_rules! py_shared_ref { |
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213 ( |
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214 $name: ident, |
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215 $inner_struct: ident, |
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216 $data_member: ident, |
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217 $leaked: ident, |
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218 ) => { |
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219 impl $name { |
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220 fn borrow_mut<'a>( |
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221 &'a self, |
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222 py: Python<'a>, |
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223 ) -> PyResult<crate::ref_sharing::PyRefMut<'a, $inner_struct>> |
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224 { |
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225 // assert $data_member type |
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226 use crate::ref_sharing::PySharedRefCell; |
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227 let data: &PySharedRefCell<_> = self.$data_member(py); |
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228 self.py_shared_state(py) |
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229 .borrow_mut(py, unsafe { data.borrow_mut() }) |
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230 } |
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231 |
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232 /// Returns a leaked reference and its management object. |
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233 /// |
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234 /// # Safety |
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235 /// |
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236 /// It's up to you to make sure that the management object lives |
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237 /// longer than the leaked reference. Otherwise, you'll get a |
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238 /// dangling reference. |
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239 unsafe fn leak_immutable<'a>( |
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240 &'a self, |
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241 py: Python<'a>, |
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242 ) -> PyResult<($leaked, &'static $inner_struct)> { |
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243 // assert $data_member type |
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244 use crate::ref_sharing::PySharedRefCell; |
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245 let data: &PySharedRefCell<_> = self.$data_member(py); |
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246 let static_ref = |
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247 self.py_shared_state(py).leak_immutable(py, data)?; |
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248 let leak_handle = $leaked::new(py, self); |
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249 Ok((leak_handle, static_ref)) |
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250 } |
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251 } |
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252 |
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253 /// Manage immutable references to `$name` leaked into Python |
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254 /// iterators. |
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255 /// |
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256 /// In truth, this does not represent leaked references themselves; |
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257 /// it is instead useful alongside them to manage them. |
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258 pub struct $leaked { |
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259 inner: $name, |
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260 } |
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261 |
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262 impl $leaked { |
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263 // Marked as unsafe so client code wouldn't construct $leaked |
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264 // struct by mistake. Its drop() is unsafe. |
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265 unsafe fn new(py: Python, inner: &$name) -> Self { |
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266 Self { |
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267 inner: inner.clone_ref(py), |
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268 } |
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269 } |
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270 } |
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271 |
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272 impl Drop for $leaked { |
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273 fn drop(&mut self) { |
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274 let gil = Python::acquire_gil(); |
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275 let py = gil.python(); |
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276 let state = self.inner.py_shared_state(py); |
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277 unsafe { |
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278 state.decrease_leak_count(py, false); |
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279 } |
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280 } |
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281 } |
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282 }; |
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283 } |
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284 |
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285 /// Defines a `py_class!` that acts as a Python iterator over a Rust iterator. |
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286 /// |
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287 /// TODO: this is a bit awkward to use, and a better (more complicated) |
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288 /// procedural macro would simplify the interface a lot. |
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289 /// |
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290 /// # Parameters |
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291 /// |
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292 /// * `$name` is the identifier to give to the resulting Rust struct. |
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293 /// * `$leaked` corresponds to `$leaked` in the matching `py_shared_ref!` call. |
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294 /// * `$iterator_type` is the type of the Rust iterator. |
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295 /// * `$success_func` is a function for processing the Rust `(key, value)` |
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296 /// tuple on iteration success, turning it into something Python understands. |
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297 /// * `$success_func` is the return type of `$success_func` |
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298 /// |
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299 /// # Example |
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300 /// |
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301 /// ``` |
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302 /// struct MyStruct { |
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303 /// inner: HashMap<Vec<u8>, Vec<u8>>; |
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304 /// } |
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305 /// |
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306 /// py_class!(pub class MyType |py| { |
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307 /// data inner: PySharedRefCell<MyStruct>; |
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308 /// data py_shared_state: PySharedState; |
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309 /// |
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310 /// def __iter__(&self) -> PyResult<MyTypeItemsIterator> { |
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311 /// let (leak_handle, leaked_ref) = unsafe { self.leak_immutable(py)? }; |
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312 /// MyTypeItemsIterator::create_instance( |
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313 /// py, |
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314 /// RefCell::new(Some(leak_handle)), |
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315 /// RefCell::new(leaked_ref.iter()), |
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316 /// ) |
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317 /// } |
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318 /// }); |
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319 /// |
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320 /// impl MyType { |
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321 /// fn translate_key_value( |
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322 /// py: Python, |
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323 /// res: (&Vec<u8>, &Vec<u8>), |
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324 /// ) -> PyResult<Option<(PyBytes, PyBytes)>> { |
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325 /// let (f, entry) = res; |
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326 /// Ok(Some(( |
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327 /// PyBytes::new(py, f), |
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328 /// PyBytes::new(py, entry), |
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329 /// ))) |
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330 /// } |
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331 /// } |
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332 /// |
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333 /// py_shared_ref!(MyType, MyStruct, inner, MyTypeLeakedRef); |
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334 /// |
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335 /// py_shared_iterator_impl!( |
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336 /// MyTypeItemsIterator, |
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337 /// MyTypeLeakedRef, |
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338 /// HashMap<'static, Vec<u8>, Vec<u8>>, |
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339 /// MyType::translate_key_value, |
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340 /// Option<(PyBytes, PyBytes)> |
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341 /// ); |
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342 /// ``` |
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343 macro_rules! py_shared_iterator_impl { |
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344 ( |
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345 $name: ident, |
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346 $leaked: ident, |
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347 $iterator_type: ty, |
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348 $success_func: expr, |
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349 $success_type: ty |
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350 ) => { |
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351 py_class!(pub class $name |py| { |
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352 data inner: RefCell<Option<$leaked>>; |
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353 data it: RefCell<$iterator_type>; |
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354 |
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355 def __next__(&self) -> PyResult<$success_type> { |
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356 let mut inner_opt = self.inner(py).borrow_mut(); |
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357 if inner_opt.is_some() { |
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358 match self.it(py).borrow_mut().next() { |
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359 None => { |
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360 // replace Some(inner) by None, drop $leaked |
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361 inner_opt.take(); |
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362 Ok(None) |
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363 } |
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364 Some(res) => { |
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365 $success_func(py, res) |
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366 } |
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367 } |
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368 } else { |
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369 Ok(None) |
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370 } |
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371 } |
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372 |
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373 def __iter__(&self) -> PyResult<Self> { |
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374 Ok(self.clone_ref(py)) |
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375 } |
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376 }); |
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377 |
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378 impl $name { |
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379 pub fn from_inner( |
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380 py: Python, |
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381 leaked: Option<$leaked>, |
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382 it: $iterator_type |
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383 ) -> PyResult<Self> { |
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384 Self::create_instance( |
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385 py, |
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386 RefCell::new(leaked), |
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387 RefCell::new(it) |
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388 ) |
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389 } |
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390 } |
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391 }; |
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392 } |