1 use gccjit::{Function, FunctionType, GlobalKind, LValue, RValue, Type};
2 use rustc_codegen_ssa::traits::BaseTypeMethods;
3 use rustc_middle::ty::Ty;
4 use rustc_span::Symbol;
5 use rustc_target::abi::call::FnAbi;
7 use crate::abi::FnAbiGccExt;
8 use crate::context::{CodegenCx, unit_name};
9 use crate::intrinsic::llvm;
10 use crate::mangled_std_symbols::{ARGV_INIT_ARRAY, ARGV_INIT_WRAPPER};
12 impl<'gcc, 'tcx> CodegenCx<'gcc, 'tcx> {
13 pub fn get_or_insert_global(&self, name: &str, ty: Type<'gcc>, is_tls: bool, link_section: Option<Symbol>) -> RValue<'gcc> {
14 if self.globals.borrow().contains_key(name) {
15 let typ = self.globals.borrow().get(name).expect("global").get_type();
16 let global = self.context.new_global(None, GlobalKind::Imported, typ, name);
18 global.set_tls_model(self.tls_model);
20 if let Some(link_section) = link_section {
21 global.set_link_section(&link_section.as_str());
23 global.get_address(None)
26 self.declare_global(name, ty, is_tls, link_section)
30 pub fn declare_unnamed_global(&self, ty: Type<'gcc>) -> LValue<'gcc> {
31 let index = self.global_gen_sym_counter.get();
32 self.global_gen_sym_counter.set(index + 1);
33 let name = format!("global_{}_{}", index, unit_name(&self.codegen_unit));
34 self.context.new_global(None, GlobalKind::Exported, ty, &name)
37 pub fn declare_global_with_linkage(&self, name: &str, ty: Type<'gcc>, linkage: GlobalKind) -> RValue<'gcc> {
38 let global = self.context.new_global(None, linkage, ty, name)
40 self.globals.borrow_mut().insert(name.to_string(), global);
41 // NOTE: global seems to only be global in a module. So save the name instead of the value
42 // to import it later.
43 self.global_names.borrow_mut().insert(global, name.to_string());
47 pub fn declare_func(&self, name: &str, return_type: Type<'gcc>, params: &[Type<'gcc>], variadic: bool) -> RValue<'gcc> {
48 self.linkage.set(FunctionType::Exported);
49 let func = declare_raw_fn(self, name, () /*llvm::CCallConv*/, return_type, params, variadic);
50 // FIXME(antoyo): this is a wrong cast. That requires changing the compiler API.
51 unsafe { std::mem::transmute(func) }
54 pub fn declare_global(&self, name: &str, ty: Type<'gcc>, is_tls: bool, link_section: Option<Symbol>) -> RValue<'gcc> {
55 // FIXME(antoyo): correctly support global variable initialization.
56 if name.starts_with(ARGV_INIT_ARRAY) {
57 // NOTE: hack to avoid having to update the names in mangled_std_symbols: we save the
58 // name of the variable now to actually declare it later.
59 *self.init_argv_var.borrow_mut() = name.to_string();
61 let global = self.context.new_global(None, GlobalKind::Imported, ty, name);
62 if let Some(link_section) = link_section {
63 global.set_link_section(&link_section.as_str());
65 return global.get_address(None);
67 let global = self.context.new_global(None, GlobalKind::Exported, ty, name);
69 global.set_tls_model(self.tls_model);
71 if let Some(link_section) = link_section {
72 global.set_link_section(&link_section.as_str());
74 let global = global.get_address(None);
75 self.globals.borrow_mut().insert(name.to_string(), global);
76 // NOTE: global seems to only be global in a module. So save the name instead of the value
77 // to import it later.
78 self.global_names.borrow_mut().insert(global, name.to_string());
82 pub fn declare_cfn(&self, name: &str, _fn_type: Type<'gcc>) -> RValue<'gcc> {
83 // TODO(antoyo): use the fn_type parameter.
84 let const_string = self.context.new_type::<u8>().make_pointer().make_pointer();
85 let return_type = self.type_i32();
87 self.linkage.set(FunctionType::Exported);
88 let func = declare_raw_fn(self, name, () /*llvm::CCallConv*/, return_type, &[self.type_i32(), const_string], variadic);
89 // NOTE: it is needed to set the current_func here as well, because get_fn() is not called
90 // for the main function.
91 *self.current_func.borrow_mut() = Some(func);
92 // FIXME(antoyo): this is a wrong cast. That requires changing the compiler API.
93 unsafe { std::mem::transmute(func) }
96 pub fn declare_fn(&self, name: &str, fn_abi: &FnAbi<'tcx, Ty<'tcx>>) -> RValue<'gcc> {
97 // NOTE: hack to avoid having to update the names in mangled_std_symbols: we found the name
98 // of the variable earlier, so we declare it now.
99 // Since we don't correctly support initializers yet, we initialize this variable manually
101 if name.starts_with(ARGV_INIT_WRAPPER) && !self.argv_initialized.get() {
102 let global_name = &*self.init_argv_var.borrow();
103 let return_type = self.type_void();
105 self.context.new_parameter(None, self.int_type, "argc"),
106 self.context.new_parameter(None, self.u8_type.make_pointer().make_pointer(), "argv"),
107 self.context.new_parameter(None, self.u8_type.make_pointer().make_pointer(), "envp"),
109 let function = self.context.new_function(None, FunctionType::Extern, return_type, ¶ms, name, false);
110 let initializer = function.get_address(None);
114 self.u8_type.make_pointer().make_pointer(),
115 self.u8_type.make_pointer().make_pointer(),
117 let ty = self.context.new_function_pointer_type(None, return_type, ¶m_types, false);
119 let global = self.context.new_global(None, GlobalKind::Exported, ty, global_name);
120 global.set_link_section(".init_array.00099");
121 global.global_set_initializer_value(initializer);
122 let global = global.get_address(None);
123 self.globals.borrow_mut().insert(global_name.to_string(), global);
124 // NOTE: global seems to only be global in a module. So save the name instead of the value
125 // to import it later.
126 self.global_names.borrow_mut().insert(global, global_name.to_string());
127 self.argv_initialized.set(true);
129 let (return_type, params, variadic) = fn_abi.gcc_type(self);
130 let func = declare_raw_fn(self, name, () /*fn_abi.llvm_cconv()*/, return_type, ¶ms, variadic);
131 // FIXME(antoyo): this is a wrong cast. That requires changing the compiler API.
132 unsafe { std::mem::transmute(func) }
135 pub fn define_global(&self, name: &str, ty: Type<'gcc>, is_tls: bool, link_section: Option<Symbol>) -> Option<RValue<'gcc>> {
136 Some(self.get_or_insert_global(name, ty, is_tls, link_section))
139 pub fn define_private_global(&self, ty: Type<'gcc>) -> RValue<'gcc> {
140 let global = self.declare_unnamed_global(ty);
141 global.get_address(None)
144 pub fn get_declared_value(&self, name: &str) -> Option<RValue<'gcc>> {
145 // TODO(antoyo): use a different field than globals, because this seems to return a function?
146 self.globals.borrow().get(name).cloned()
150 /// Declare a function.
152 /// If there’s a value with the same name already declared, the function will
153 /// update the declaration and return existing Value instead.
154 fn declare_raw_fn<'gcc>(cx: &CodegenCx<'gcc, '_>, name: &str, _callconv: () /*llvm::CallConv*/, return_type: Type<'gcc>, param_types: &[Type<'gcc>], variadic: bool) -> Function<'gcc> {
155 if name.starts_with("llvm.") {
156 return llvm::intrinsic(name, cx);
159 if cx.functions.borrow().contains_key(name) {
160 *cx.functions.borrow().get(name).expect("function")
163 let params: Vec<_> = param_types.into_iter().enumerate()
164 .map(|(index, param)| cx.context.new_parameter(None, *param, &format!("param{}", index))) // TODO(antoyo): set name.
166 let func = cx.context.new_function(None, cx.linkage.get(), return_type, ¶ms, mangle_name(name), variadic);
167 cx.functions.borrow_mut().insert(name.to_string(), func);
171 // TODO(antoyo): set function calling convention.
172 // TODO(antoyo): set unnamed address.
173 // TODO(antoyo): set no red zone function attribute.
174 // TODO(antoyo): set attributes for optimisation.
175 // TODO(antoyo): set attributes for non lazy bind.
177 // FIXME(antoyo): invalid cast.
181 // FIXME(antoyo): this is a hack because libgccjit currently only supports alpha, num and _.
182 // Unsupported characters: `$` and `.`.
183 pub fn mangle_name(name: &str) -> String {
184 name.replace(|char: char| {
185 if !char.is_alphanumeric() && char != '_' {
186 debug_assert!("$.".contains(char), "Unsupported char in function name: {}", char);