pub struct CodegenCx<'ll, 'tcx> {
Show 26 fields pub tcx: TyCtxt<'tcx>, pub check_overflow: bool, pub use_dll_storage_attrs: bool, pub tls_model: ThreadLocalMode, pub llmod: &'ll Module, pub llcx: &'ll Context, pub codegen_unit: &'tcx CodegenUnit<'tcx>, pub instances: RefCell<FxHashMap<Instance<'tcx>, &'ll Value>>, pub vtables: RefCell<FxHashMap<(Ty<'tcx>, Option<PolyExistentialTraitRef<'tcx>>), &'ll Value>>, pub const_str_cache: RefCell<FxHashMap<String, &'ll Value>>, pub const_globals: RefCell<FxHashMap<&'ll Value, &'ll Value>>, pub statics_to_rauw: RefCell<Vec<(&'ll Value, &'ll Value)>>, pub used_statics: RefCell<Vec<&'ll Value>>, pub compiler_used_statics: RefCell<Vec<&'ll Value>>, pub type_lowering: RefCell<FxHashMap<(Ty<'tcx>, Option<VariantIdx>), TypeLowering<'ll>>>, pub scalar_lltypes: RefCell<FxHashMap<Ty<'tcx>, &'ll Type>>, pub pointee_infos: RefCell<FxHashMap<(Ty<'tcx>, Size), Option<PointeeInfo>>>, pub isize_ty: &'ll Type, pub coverage_cx: Option<CrateCoverageContext<'ll, 'tcx>>, pub dbg_cx: Option<CodegenUnitDebugContext<'ll, 'tcx>>, eh_personality: Cell<Option<&'ll Value>>, eh_catch_typeinfo: Cell<Option<&'ll Value>>, pub rust_try_fn: Cell<Option<(&'ll Type, &'ll Value)>>, intrinsics: RefCell<FxHashMap<&'static str, (&'ll Type, &'ll Value)>>, local_gen_sym_counter: Cell<usize>, pub renamed_statics: RefCell<FxHashMap<DefId, &'ll Value>>,
}
Expand description

There is one CodegenCx per compilation unit. Each one has its own LLVM llvm::Context so that several compilation units may be optimized in parallel. All other LLVM data structures in the CodegenCx are tied to that llvm::Context.

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§tcx: TyCtxt<'tcx>§check_overflow: bool§use_dll_storage_attrs: bool§tls_model: ThreadLocalMode§llmod: &'ll Module§llcx: &'ll Context§codegen_unit: &'tcx CodegenUnit<'tcx>§instances: RefCell<FxHashMap<Instance<'tcx>, &'ll Value>>

Cache instances of monomorphic and polymorphic items

§vtables: RefCell<FxHashMap<(Ty<'tcx>, Option<PolyExistentialTraitRef<'tcx>>), &'ll Value>>

Cache generated vtables

§const_str_cache: RefCell<FxHashMap<String, &'ll Value>>

Cache of constant strings,

§const_globals: RefCell<FxHashMap<&'ll Value, &'ll Value>>

Cache of emitted const globals (value -> global)

§statics_to_rauw: RefCell<Vec<(&'ll Value, &'ll Value)>>

List of globals for static variables which need to be passed to the LLVM function ReplaceAllUsesWith (RAUW) when codegen is complete. (We have to make sure we don’t invalidate any Values referring to constants.)

§used_statics: RefCell<Vec<&'ll Value>>

Statics that will be placed in the llvm.used variable See https://llvm.org/docs/LangRef.html#the-llvm-used-global-variable for details

§compiler_used_statics: RefCell<Vec<&'ll Value>>

Statics that will be placed in the llvm.compiler.used variable See https://llvm.org/docs/LangRef.html#the-llvm-compiler-used-global-variable for details

§type_lowering: RefCell<FxHashMap<(Ty<'tcx>, Option<VariantIdx>), TypeLowering<'ll>>>

Mapping of non-scalar types to llvm types and field remapping if needed.

§scalar_lltypes: RefCell<FxHashMap<Ty<'tcx>, &'ll Type>>

Mapping of scalar types to llvm types.

§pointee_infos: RefCell<FxHashMap<(Ty<'tcx>, Size), Option<PointeeInfo>>>§isize_ty: &'ll Type§coverage_cx: Option<CrateCoverageContext<'ll, 'tcx>>§dbg_cx: Option<CodegenUnitDebugContext<'ll, 'tcx>>§eh_personality: Cell<Option<&'ll Value>>§eh_catch_typeinfo: Cell<Option<&'ll Value>>§rust_try_fn: Cell<Option<(&'ll Type, &'ll Value)>>§intrinsics: RefCell<FxHashMap<&'static str, (&'ll Type, &'ll Value)>>§local_gen_sym_counter: Cell<usize>

A counter that is used for generating local symbol names

§renamed_statics: RefCell<FxHashMap<DefId, &'ll Value>>

codegen_static will sometimes create a second global variable with a different type and clear the symbol name of the original global. global_asm! needs to be able to find this new global so that it can compute the correct mangled symbol name to insert into the asm.

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impl<'ll> CodegenCx<'ll, '_>

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pub fn const_array(&self, ty: &'ll Type, elts: &[&'ll Value]) -> &'ll Value

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pub fn const_vector(&self, elts: &[&'ll Value]) -> &'ll Value

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pub fn const_bytes(&self, bytes: &[u8]) -> &'ll Value

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pub fn const_get_elt(&self, v: &'ll Value, idx: u64) -> &'ll Value

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impl<'ll> CodegenCx<'ll, '_>

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pub(crate) fn const_bitcast(&self, val: &'ll Value, ty: &'ll Type) -> &'ll Value

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pub(crate) fn static_addr_of_mut( &self, cv: &'ll Value, align: Align, kind: Option<&str> ) -> &'ll Value

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pub(crate) fn get_static(&self, def_id: DefId) -> &'ll Value

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impl<'ll, 'tcx> CodegenCx<'ll, 'tcx>

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pub(crate) fn new( tcx: TyCtxt<'tcx>, codegen_unit: &'tcx CodegenUnit<'tcx>, llvm_module: &'ll ModuleLlvm ) -> Self

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pub(crate) fn statics_to_rauw(&self) -> &RefCell<Vec<(&'ll Value, &'ll Value)>>

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pub fn coverage_context(&self) -> Option<&CrateCoverageContext<'ll, 'tcx>>

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pub(crate) fn create_used_variable_impl( &self, name: &'static CStr, values: &[&'ll Value] )

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impl<'ll> CodegenCx<'ll, '_>

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pub(crate) fn get_intrinsic(&self, key: &str) -> (&'ll Type, &'ll Value)

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fn insert_intrinsic( &self, name: &'static str, args: Option<&[&'ll Type]>, ret: &'ll Type ) -> (&'ll Type, &'ll Value)

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fn declare_intrinsic(&self, key: &str) -> Option<(&'ll Type, &'ll Value)>

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pub(crate) fn eh_catch_typeinfo(&self) -> &'ll Value

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impl CodegenCx<'_, '_>

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pub fn generate_local_symbol_name(&self, prefix: &str) -> String

Generates a new symbol name with the given prefix. This symbol name must only be used for definitions with internal or private linkage.

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impl<'ll, 'tcx> CodegenCx<'ll, 'tcx>

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pub(crate) fn coverageinfo_finalize(&self)

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fn get_pgo_func_name_var(&self, instance: Instance<'tcx>) -> &'ll Value

For LLVM codegen, returns a function-specific Value for a global string, to hold the function name passed to LLVM intrinsic instrprof.increment(). The Value is only created once per instance. Multiple invocations with the same instance return the same Value.

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fn define_unused_fn(&self, def_id: DefId)

Functions with MIR-based coverage are normally codegenned only if called. LLVM coverage tools typically expect every function to be defined (even if unused), with at least one call to LLVM intrinsic instrprof.increment.

Codegen a small function that will never be called, with one counter that will never be incremented.

For used/called functions, the coverageinfo was already added to the function_coverage_map (keyed by function Instance) during codegen. But in this case, since the unused function was not previously codegenned, collect the coverage CodeRegions from the MIR and add them. Since the function is never called, all of its CodeRegions can be added as unreachable_regions.

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impl CodegenCx<'_, '_>

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pub fn lookup_debug_loc(&self, pos: BytePos) -> DebugLoc

Looks up debug source information about a BytePos.

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impl<'ll, 'tcx> CodegenCx<'ll, 'tcx>

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pub fn declare_global(&self, name: &str, ty: &'ll Type) -> &'ll Value

Declare a global value.

If there’s a value with the same name already declared, the function will return its Value instead.

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pub fn declare_cfn( &self, name: &str, unnamed: UnnamedAddr, fn_type: &'ll Type ) -> &'ll Value

Declare a C ABI function.

Only use this for foreign function ABIs and glue. For Rust functions use declare_fn instead.

If there’s a value with the same name already declared, the function will update the declaration and return existing Value instead.

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pub fn declare_entry_fn( &self, name: &str, callconv: CallConv, unnamed: UnnamedAddr, fn_type: &'ll Type ) -> &'ll Value

Declare an entry Function

The ABI of this function can change depending on the target (although for now the same as declare_cfn)

If there’s a value with the same name already declared, the function will update the declaration and return existing Value instead.

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pub fn declare_fn( &self, name: &str, fn_abi: &FnAbi<'tcx, Ty<'tcx>>, instance: Option<Instance<'tcx>> ) -> &'ll Value

Declare a Rust function.

If there’s a value with the same name already declared, the function will update the declaration and return existing Value instead.

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pub fn define_global(&self, name: &str, ty: &'ll Type) -> Option<&'ll Value>

Declare a global with an intention to define it.

Use this function when you intend to define a global. This function will return None if the name already has a definition associated with it. In that case an error should be reported to the user, because it usually happens due to user’s fault (e.g., misuse of #[no_mangle] or #[export_name] attributes).

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pub fn define_private_global(&self, ty: &'ll Type) -> &'ll Value

Declare a private global

Use this function when you intend to define a global without a name.

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pub fn get_declared_value(&self, name: &str) -> Option<&'ll Value>

Gets declared value by name.

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pub fn get_defined_value(&self, name: &str) -> Option<&'ll Value>

Gets defined or externally defined (AvailableExternally linkage) value by name.

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impl CodegenCx<'_, '_>

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pub(crate) unsafe fn should_assume_dso_local( &self, llval: &Value, is_declaration: bool ) -> bool

Whether a definition or declaration can be assumed to be local to a group of libraries that form a single DSO or executable.

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impl<'ll> CodegenCx<'ll, '_>

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pub(crate) fn type_named_struct(&self, name: &str) -> &'ll Type

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pub(crate) fn set_struct_body( &self, ty: &'ll Type, els: &[&'ll Type], packed: bool )

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pub(crate) fn type_void(&self) -> &'ll Type

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pub(crate) fn type_token(&self) -> &'ll Type

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pub(crate) fn type_metadata(&self) -> &'ll Type

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pub(crate) fn type_ix(&self, num_bits: u64) -> &'ll Type

x Creates an integer type with the given number of bits, e.g., i24

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pub(crate) fn type_vector(&self, ty: &'ll Type, len: u64) -> &'ll Type

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pub(crate) fn func_params_types(&self, ty: &'ll Type) -> Vec<&'ll Type>

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pub(crate) fn type_bool(&self) -> &'ll Type

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pub(crate) fn type_int_from_ty(&self, t: IntTy) -> &'ll Type

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pub(crate) fn type_uint_from_ty(&self, t: UintTy) -> &'ll Type

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pub(crate) fn type_float_from_ty(&self, t: FloatTy) -> &'ll Type

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pub(crate) fn type_padding_filler(&self, size: Size, align: Align) -> &'ll Type

Return an LLVM type that has at most the required alignment, and exactly the required size, as a best-effort padding array.

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pub(crate) fn type_variadic_func( &self, args: &[&'ll Type], ret: &'ll Type ) -> &'ll Type

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impl<'a, 'tcx> CodegenCx<'a, 'tcx>

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pub fn align_of(&self, ty: Ty<'tcx>) -> Align

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pub fn size_of(&self, ty: Ty<'tcx>) -> Size

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pub fn size_and_align_of(&self, ty: Ty<'tcx>) -> (Size, Align)

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impl<'tcx> AsmMethods<'tcx> for CodegenCx<'_, 'tcx>

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fn codegen_global_asm( &self, template: &[InlineAsmTemplatePiece], operands: &[GlobalAsmOperandRef<'tcx>], options: InlineAsmOptions, _line_spans: &[Span] )

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impl<'ll> BackendTypes for CodegenCx<'ll, '_>

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type Value = &'ll Value

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type Function = &'ll Value

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type BasicBlock = &'ll BasicBlock

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type Type = &'ll Type

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type Funclet = Funclet<'ll>

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type DIScope = &'ll Metadata

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type DILocation = &'ll Metadata

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type DIVariable = &'ll Metadata

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impl<'ll, 'tcx> BaseTypeMethods<'tcx> for CodegenCx<'ll, 'tcx>

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fn type_i1(&self) -> &'ll Type

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fn type_i8(&self) -> &'ll Type

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fn type_i16(&self) -> &'ll Type

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fn type_i32(&self) -> &'ll Type

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fn type_i64(&self) -> &'ll Type

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fn type_i128(&self) -> &'ll Type

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fn type_isize(&self) -> &'ll Type

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fn type_f32(&self) -> &'ll Type

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fn type_f64(&self) -> &'ll Type

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fn type_func(&self, args: &[&'ll Type], ret: &'ll Type) -> &'ll Type

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fn type_struct(&self, els: &[&'ll Type], packed: bool) -> &'ll Type

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fn type_kind(&self, ty: &'ll Type) -> TypeKind

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fn type_ptr(&self) -> &'ll Type

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fn type_ptr_ext(&self, address_space: AddressSpace) -> &'ll Type

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fn element_type(&self, ty: &'ll Type) -> &'ll Type

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fn vector_length(&self, ty: &'ll Type) -> usize

Returns the number of elements in self if it is an LLVM vector type.
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fn float_width(&self, ty: &'ll Type) -> usize

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fn int_width(&self, ty: &'ll Type) -> u64

Retrieves the bit width of the integer type self.
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fn val_ty(&self, v: &'ll Value) -> &'ll Type

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fn type_array(&self, ty: &'ll Type, len: u64) -> &'ll Type

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impl<'ll, 'tcx> ConstMethods<'tcx> for CodegenCx<'ll, 'tcx>

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fn const_null(&self, t: &'ll Type) -> &'ll Value

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fn const_undef(&self, t: &'ll Type) -> &'ll Value

Generate an uninitialized value (matching uninitialized memory in MIR). Whether memory is initialized or not is tracked byte-for-byte.
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fn const_poison(&self, t: &'ll Type) -> &'ll Value

Generate a fake value. Poison always affects the entire value, even if just a single byte is poison. This can only be used in codepaths that are already UB, i.e., UB-free Rust code (including code that e.g. copies uninit memory with MaybeUninit) can never encounter a poison value.
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fn const_int(&self, t: &'ll Type, i: i64) -> &'ll Value

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fn const_uint(&self, t: &'ll Type, i: u64) -> &'ll Value

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fn const_uint_big(&self, t: &'ll Type, u: u128) -> &'ll Value

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fn const_bool(&self, val: bool) -> &'ll Value

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fn const_i16(&self, i: i16) -> &'ll Value

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fn const_i32(&self, i: i32) -> &'ll Value

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fn const_u32(&self, i: u32) -> &'ll Value

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fn const_u64(&self, i: u64) -> &'ll Value

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fn const_u128(&self, i: u128) -> &'ll Value

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fn const_usize(&self, i: u64) -> &'ll Value

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fn const_u8(&self, i: u8) -> &'ll Value

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fn const_real(&self, t: &'ll Type, val: f64) -> &'ll Value

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fn const_str(&self, s: &str) -> (&'ll Value, &'ll Value)

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fn const_struct(&self, elts: &[&'ll Value], packed: bool) -> &'ll Value

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fn const_to_opt_uint(&self, v: &'ll Value) -> Option<u64>

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fn const_to_opt_u128(&self, v: &'ll Value, sign_ext: bool) -> Option<u128>

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fn scalar_to_backend( &self, cv: Scalar, layout: Scalar, llty: &'ll Type ) -> &'ll Value

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fn const_data_from_alloc(&self, alloc: ConstAllocation<'tcx>) -> Self::Value

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fn const_bitcast(&self, val: &'ll Value, ty: &'ll Type) -> &'ll Value

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fn const_ptr_byte_offset( &self, base_addr: Self::Value, offset: Size ) -> Self::Value

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impl<'ll, 'tcx> DebugInfoMethods<'tcx> for CodegenCx<'ll, 'tcx>

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fn create_function_debug_context( &self, instance: Instance<'tcx>, fn_abi: &FnAbi<'tcx, Ty<'tcx>>, llfn: &'ll Value, mir: &Body<'tcx> ) -> Option<FunctionDebugContext<'tcx, &'ll DIScope, &'ll DILocation>>

Creates the function-specific debug context. Read more
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fn dbg_scope_fn( &self, instance: Instance<'tcx>, fn_abi: &FnAbi<'tcx, Ty<'tcx>>, maybe_definition_llfn: Option<&'ll Value> ) -> &'ll DIScope

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fn dbg_loc( &self, scope: &'ll DIScope, inlined_at: Option<&'ll DILocation>, span: Span ) -> &'ll DILocation

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fn create_vtable_debuginfo( &self, ty: Ty<'tcx>, trait_ref: Option<PolyExistentialTraitRef<'tcx>>, vtable: Self::Value )

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fn extend_scope_to_file( &self, scope_metadata: &'ll DIScope, file: &SourceFile ) -> &'ll DILexicalBlock

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fn debuginfo_finalize(&self)

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fn create_dbg_var( &self, variable_name: Symbol, variable_type: Ty<'tcx>, scope_metadata: &'ll DIScope, variable_kind: VariableKind, span: Span ) -> &'ll DIVariable

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impl<'tcx> FnAbiOfHelpers<'tcx> for CodegenCx<'_, 'tcx>

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type FnAbiOfResult = &'tcx FnAbi<'tcx, Ty<'tcx>>

The &FnAbi-wrapping type (or &FnAbi itself), which will be returned from fn_abi_of_* (see also handle_fn_abi_err).
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fn handle_fn_abi_err( &self, err: FnAbiError<'tcx>, span: Span, fn_abi_request: FnAbiRequest<'tcx> ) -> !

Helper used for fn_abi_of_*, to adapt tcx.fn_abi_of_*(...) into a Self::FnAbiOfResult (which does not need to be a Result<...>). Read more
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impl HasDataLayout for CodegenCx<'_, '_>

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impl<'tcx, 'll> HasParamEnv<'tcx> for CodegenCx<'ll, 'tcx>

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fn param_env(&self) -> ParamEnv<'tcx>

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impl HasTargetSpec for CodegenCx<'_, '_>

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impl<'tcx> HasTyCtxt<'tcx> for CodegenCx<'_, 'tcx>

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fn tcx(&self) -> TyCtxt<'tcx>

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impl<'tcx> LayoutOfHelpers<'tcx> for CodegenCx<'_, 'tcx>

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type LayoutOfResult = TyAndLayout<'tcx, Ty<'tcx>>

The TyAndLayout-wrapping type (or TyAndLayout itself), which will be returned from layout_of (see also handle_layout_err).
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fn handle_layout_err( &self, err: LayoutError<'tcx>, span: Span, ty: Ty<'tcx> ) -> !

Helper used for layout_of, to adapt tcx.layout_of(...) into a Self::LayoutOfResult (which does not need to be a Result<...>). Read more
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fn layout_tcx_at_span(&self) -> Span

Span to use for tcx.at(span), from layout_of.
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impl<'ll, 'tcx> LayoutTypeMethods<'tcx> for CodegenCx<'ll, 'tcx>

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fn backend_type(&self, layout: TyAndLayout<'tcx>) -> &'ll Type

The backend type used for a rust type when it’s in memory, such as when it’s stack-allocated or when it’s being loaded or stored.
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fn immediate_backend_type(&self, layout: TyAndLayout<'tcx>) -> &'ll Type

The backend type used for a rust type when it’s in an SSA register. Read more
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fn is_backend_immediate(&self, layout: TyAndLayout<'tcx>) -> bool

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fn is_backend_scalar_pair(&self, layout: TyAndLayout<'tcx>) -> bool

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fn backend_field_index(&self, layout: TyAndLayout<'tcx>, index: usize) -> u64

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fn scalar_pair_element_backend_type( &self, layout: TyAndLayout<'tcx>, index: usize, immediate: bool ) -> &'ll Type

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fn cast_backend_type(&self, ty: &CastTarget) -> &'ll Type

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fn fn_decl_backend_type(&self, fn_abi: &FnAbi<'tcx, Ty<'tcx>>) -> &'ll Type

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fn fn_ptr_backend_type(&self, fn_abi: &FnAbi<'tcx, Ty<'tcx>>) -> &'ll Type

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fn reg_backend_type(&self, ty: &Reg) -> &'ll Type

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fn scalar_copy_backend_type( &self, layout: TyAndLayout<'tcx> ) -> Option<Self::Type>

A type that can be used in a super::BuilderMethods::load + super::BuilderMethods::store pair to implement a typed copy, such as a MIR *_0 = *_1. Read more
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impl<'ll, 'tcx> MiscMethods<'tcx> for CodegenCx<'ll, 'tcx>

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fn vtables( &self ) -> &RefCell<FxHashMap<(Ty<'tcx>, Option<PolyExistentialTraitRef<'tcx>>), &'ll Value>>

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fn get_fn(&self, instance: Instance<'tcx>) -> &'ll Value

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fn get_fn_addr(&self, instance: Instance<'tcx>) -> &'ll Value

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fn eh_personality(&self) -> &'ll Value

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fn sess(&self) -> &Session

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fn check_overflow(&self) -> bool

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fn codegen_unit(&self) -> &'tcx CodegenUnit<'tcx>

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fn set_frame_pointer_type(&self, llfn: &'ll Value)

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fn apply_target_cpu_attr(&self, llfn: &'ll Value)

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fn declare_c_main(&self, fn_type: Self::Type) -> Option<Self::Function>

Declares the extern “C” main function for the entry point. Returns None if the symbol already exists.
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impl<'tcx> PreDefineMethods<'tcx> for CodegenCx<'_, 'tcx>

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fn predefine_static( &self, def_id: DefId, linkage: Linkage, visibility: Visibility, symbol_name: &str )

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fn predefine_fn( &self, instance: Instance<'tcx>, linkage: Linkage, visibility: Visibility, symbol_name: &str )

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impl<'ll> StaticMethods for CodegenCx<'ll, '_>

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fn add_used_global(&self, global: &'ll Value)

Add a global value to a list to be stored in the llvm.used variable, an array of ptr.

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fn add_compiler_used_global(&self, global: &'ll Value)

Add a global value to a list to be stored in the llvm.compiler.used variable, an array of ptr.

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fn static_addr_of( &self, cv: &'ll Value, align: Align, kind: Option<&str> ) -> &'ll Value

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fn codegen_static(&self, def_id: DefId, is_mutable: bool)

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impl<'ll, 'tcx> TypeMembershipMethods<'tcx> for CodegenCx<'ll, 'tcx>

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fn add_type_metadata(&self, function: &'ll Value, typeid: String)

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fn set_type_metadata(&self, function: &'ll Value, typeid: String)

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fn typeid_metadata(&self, typeid: String) -> Option<&'ll Value>

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fn add_kcfi_type_metadata(&self, function: &'ll Value, kcfi_typeid: u32)

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fn set_kcfi_type_metadata(&self, function: &'ll Value, kcfi_typeid: u32)

Auto Trait Implementations§

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impl<'ll, 'tcx> !RefUnwindSafe for CodegenCx<'ll, 'tcx>

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impl<'ll, 'tcx> !Send for CodegenCx<'ll, 'tcx>

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impl<'ll, 'tcx> !Sync for CodegenCx<'ll, 'tcx>

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impl<'ll, 'tcx> Unpin for CodegenCx<'ll, 'tcx>

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impl<'ll, 'tcx> !UnwindSafe for CodegenCx<'ll, 'tcx>

Blanket Implementations§

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impl<T> Any for Twhere T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for Twhere T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for Twhere T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for Twhere U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T, U> TryFrom<U> for Twhere U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.

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Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 784 bytes