1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
#![allow(non_snake_case)]

pub use self::AtomicRmwBinOp::*;
pub use self::CallConv::*;
pub use self::CodeGenOptSize::*;
pub use self::IntPredicate::*;
pub use self::Linkage::*;
pub use self::MetadataType::*;
pub use self::RealPredicate::*;

use libc::c_uint;
use rustc_data_structures::small_c_str::SmallCStr;
use rustc_llvm::RustString;
use std::cell::RefCell;
use std::ffi::{CStr, CString};
use std::str::FromStr;
use std::string::FromUtf8Error;

pub mod archive_ro;
pub mod diagnostic;
mod ffi;

pub use self::ffi::*;

impl LLVMRustResult {
    pub fn into_result(self) -> Result<(), ()> {
        match self {
            LLVMRustResult::Success => Ok(()),
            LLVMRustResult::Failure => Err(()),
        }
    }
}

pub fn AddFunctionAttributes<'ll>(llfn: &'ll Value, idx: AttributePlace, attrs: &[&'ll Attribute]) {
    unsafe {
        LLVMRustAddFunctionAttributes(llfn, idx.as_uint(), attrs.as_ptr(), attrs.len());
    }
}

pub fn AddCallSiteAttributes<'ll>(
    callsite: &'ll Value,
    idx: AttributePlace,
    attrs: &[&'ll Attribute],
) {
    unsafe {
        LLVMRustAddCallSiteAttributes(callsite, idx.as_uint(), attrs.as_ptr(), attrs.len());
    }
}

pub fn CreateAttrStringValue<'ll>(llcx: &'ll Context, attr: &str, value: &str) -> &'ll Attribute {
    unsafe {
        LLVMCreateStringAttribute(
            llcx,
            attr.as_ptr().cast(),
            attr.len().try_into().unwrap(),
            value.as_ptr().cast(),
            value.len().try_into().unwrap(),
        )
    }
}

pub fn CreateAttrString<'ll>(llcx: &'ll Context, attr: &str) -> &'ll Attribute {
    unsafe {
        LLVMCreateStringAttribute(
            llcx,
            attr.as_ptr().cast(),
            attr.len().try_into().unwrap(),
            std::ptr::null(),
            0,
        )
    }
}

pub fn CreateAlignmentAttr(llcx: &Context, bytes: u64) -> &Attribute {
    unsafe { LLVMRustCreateAlignmentAttr(llcx, bytes) }
}

pub fn CreateDereferenceableAttr(llcx: &Context, bytes: u64) -> &Attribute {
    unsafe { LLVMRustCreateDereferenceableAttr(llcx, bytes) }
}

pub fn CreateDereferenceableOrNullAttr(llcx: &Context, bytes: u64) -> &Attribute {
    unsafe { LLVMRustCreateDereferenceableOrNullAttr(llcx, bytes) }
}

pub fn CreateByValAttr<'ll>(llcx: &'ll Context, ty: &'ll Type) -> &'ll Attribute {
    unsafe { LLVMRustCreateByValAttr(llcx, ty) }
}

pub fn CreateStructRetAttr<'ll>(llcx: &'ll Context, ty: &'ll Type) -> &'ll Attribute {
    unsafe { LLVMRustCreateStructRetAttr(llcx, ty) }
}

pub fn CreateUWTableAttr(llcx: &Context, async_: bool) -> &Attribute {
    unsafe { LLVMRustCreateUWTableAttr(llcx, async_) }
}

#[derive(Copy, Clone)]
pub enum AttributePlace {
    ReturnValue,
    Argument(u32),
    Function,
}

impl AttributePlace {
    pub fn as_uint(self) -> c_uint {
        match self {
            AttributePlace::ReturnValue => 0,
            AttributePlace::Argument(i) => 1 + i,
            AttributePlace::Function => !0,
        }
    }
}

#[derive(Copy, Clone, PartialEq)]
#[repr(C)]
pub enum CodeGenOptSize {
    CodeGenOptSizeNone = 0,
    CodeGenOptSizeDefault = 1,
    CodeGenOptSizeAggressive = 2,
}

impl FromStr for ArchiveKind {
    type Err = ();

    fn from_str(s: &str) -> Result<Self, Self::Err> {
        match s {
            "gnu" => Ok(ArchiveKind::K_GNU),
            "bsd" => Ok(ArchiveKind::K_BSD),
            "darwin" => Ok(ArchiveKind::K_DARWIN),
            "coff" => Ok(ArchiveKind::K_COFF),
            _ => Err(()),
        }
    }
}

pub fn SetInstructionCallConv(instr: &Value, cc: CallConv) {
    unsafe {
        LLVMSetInstructionCallConv(instr, cc as c_uint);
    }
}
pub fn SetFunctionCallConv(fn_: &Value, cc: CallConv) {
    unsafe {
        LLVMSetFunctionCallConv(fn_, cc as c_uint);
    }
}

// Externally visible symbols that might appear in multiple codegen units need to appear in
// their own comdat section so that the duplicates can be discarded at link time. This can for
// example happen for generics when using multiple codegen units. This function simply uses the
// value's name as the comdat value to make sure that it is in a 1-to-1 relationship to the
// function.
// For more details on COMDAT sections see e.g., https://www.airs.com/blog/archives/52
pub fn SetUniqueComdat(llmod: &Module, val: &Value) {
    unsafe {
        let name = get_value_name(val);
        LLVMRustSetComdat(llmod, val, name.as_ptr().cast(), name.len());
    }
}

pub fn UnsetComdat(val: &Value) {
    unsafe {
        LLVMRustUnsetComdat(val);
    }
}

pub fn SetUnnamedAddress(global: &Value, unnamed: UnnamedAddr) {
    unsafe {
        LLVMSetUnnamedAddress(global, unnamed);
    }
}

pub fn set_thread_local_mode(global: &Value, mode: ThreadLocalMode) {
    unsafe {
        LLVMSetThreadLocalMode(global, mode);
    }
}

impl AttributeKind {
    /// Create an LLVM Attribute with no associated value.
    pub fn create_attr(self, llcx: &Context) -> &Attribute {
        unsafe { LLVMRustCreateAttrNoValue(llcx, self) }
    }
}

pub fn set_section(llglobal: &Value, section_name: &str) {
    let section_name_cstr = CString::new(section_name).expect("unexpected CString error");
    unsafe {
        LLVMSetSection(llglobal, section_name_cstr.as_ptr());
    }
}

pub fn add_global<'a>(llmod: &'a Module, ty: &'a Type, name: &str) -> &'a Value {
    let name_cstr = CString::new(name).expect("unexpected CString error");
    unsafe { LLVMAddGlobal(llmod, ty, name_cstr.as_ptr()) }
}

pub fn set_initializer(llglobal: &Value, constant_val: &Value) {
    unsafe {
        LLVMSetInitializer(llglobal, constant_val);
    }
}

pub fn set_global_constant(llglobal: &Value, is_constant: bool) {
    unsafe {
        LLVMSetGlobalConstant(llglobal, if is_constant { ffi::True } else { ffi::False });
    }
}

pub fn set_linkage(llglobal: &Value, linkage: Linkage) {
    unsafe {
        LLVMRustSetLinkage(llglobal, linkage);
    }
}

pub fn set_visibility(llglobal: &Value, visibility: Visibility) {
    unsafe {
        LLVMRustSetVisibility(llglobal, visibility);
    }
}

pub fn set_alignment(llglobal: &Value, bytes: usize) {
    unsafe {
        ffi::LLVMSetAlignment(llglobal, bytes as c_uint);
    }
}

pub fn set_comdat(llmod: &Module, llglobal: &Value, name: &str) {
    unsafe {
        LLVMRustSetComdat(llmod, llglobal, name.as_ptr().cast(), name.len());
    }
}

/// Safe wrapper around `LLVMGetParam`, because segfaults are no fun.
pub fn get_param(llfn: &Value, index: c_uint) -> &Value {
    unsafe {
        assert!(
            index < LLVMCountParams(llfn),
            "out of bounds argument access: {} out of {} arguments",
            index,
            LLVMCountParams(llfn)
        );
        LLVMGetParam(llfn, index)
    }
}

/// Safe wrapper for `LLVMGetValueName2` into a byte slice
pub fn get_value_name(value: &Value) -> &[u8] {
    unsafe {
        let mut len = 0;
        let data = LLVMGetValueName2(value, &mut len);
        std::slice::from_raw_parts(data.cast(), len)
    }
}

/// Safe wrapper for `LLVMSetValueName2` from a byte slice
pub fn set_value_name(value: &Value, name: &[u8]) {
    unsafe {
        let data = name.as_ptr().cast();
        LLVMSetValueName2(value, data, name.len());
    }
}

pub fn build_string(f: impl FnOnce(&RustString)) -> Result<String, FromUtf8Error> {
    let sr = RustString { bytes: RefCell::new(Vec::new()) };
    f(&sr);
    String::from_utf8(sr.bytes.into_inner())
}

pub fn build_byte_buffer(f: impl FnOnce(&RustString)) -> Vec<u8> {
    let sr = RustString { bytes: RefCell::new(Vec::new()) };
    f(&sr);
    sr.bytes.into_inner()
}

pub fn twine_to_string(tr: &Twine) -> String {
    unsafe {
        build_string(|s| LLVMRustWriteTwineToString(tr, s)).expect("got a non-UTF8 Twine from LLVM")
    }
}

pub fn last_error() -> Option<String> {
    unsafe {
        let cstr = LLVMRustGetLastError();
        if cstr.is_null() {
            None
        } else {
            let err = CStr::from_ptr(cstr).to_bytes();
            let err = String::from_utf8_lossy(err).to_string();
            libc::free(cstr as *mut _);
            Some(err)
        }
    }
}

pub struct OperandBundleDef<'a> {
    pub raw: &'a mut ffi::OperandBundleDef<'a>,
}

impl<'a> OperandBundleDef<'a> {
    pub fn new(name: &str, vals: &[&'a Value]) -> Self {
        let name = SmallCStr::new(name);
        let def = unsafe {
            LLVMRustBuildOperandBundleDef(name.as_ptr(), vals.as_ptr(), vals.len() as c_uint)
        };
        OperandBundleDef { raw: def }
    }
}

impl Drop for OperandBundleDef<'_> {
    fn drop(&mut self) {
        unsafe {
            LLVMRustFreeOperandBundleDef(&mut *(self.raw as *mut _));
        }
    }
}