diff options
Diffstat (limited to 'compiler/rustc_codegen_cranelift/src/atomic_shim.rs')
| -rw-r--r-- | compiler/rustc_codegen_cranelift/src/atomic_shim.rs | 185 |
1 files changed, 0 insertions, 185 deletions
diff --git a/compiler/rustc_codegen_cranelift/src/atomic_shim.rs b/compiler/rustc_codegen_cranelift/src/atomic_shim.rs deleted file mode 100644 index 674e6d90751..00000000000 --- a/compiler/rustc_codegen_cranelift/src/atomic_shim.rs +++ /dev/null @@ -1,185 +0,0 @@ -//! Atomic intrinsics are implemented using a global lock for now, as Cranelift doesn't support -//! atomic operations yet. - -// FIXME implement atomic instructions in Cranelift. - -use crate::prelude::*; - -#[cfg(all(feature = "jit", unix))] -#[no_mangle] -static mut __cg_clif_global_atomic_mutex: libc::pthread_mutex_t = libc::PTHREAD_MUTEX_INITIALIZER; - -pub(crate) fn init_global_lock( - module: &mut impl Module, - bcx: &mut FunctionBuilder<'_>, - use_jit: bool, -) { - if use_jit { - // When using JIT, dylibs won't find the __cg_clif_global_atomic_mutex data object defined here, - // so instead we define it in the cg_clif dylib. - - return; - } - - let mut data_ctx = DataContext::new(); - data_ctx.define_zeroinit(1024); // 1024 bytes should be big enough on all platforms. - data_ctx.set_align(16); - let atomic_mutex = module - .declare_data( - "__cg_clif_global_atomic_mutex", - Linkage::Export, - true, - false, - ) - .unwrap(); - module.define_data(atomic_mutex, &data_ctx).unwrap(); - - let pthread_mutex_init = module - .declare_function( - "pthread_mutex_init", - Linkage::Import, - &cranelift_codegen::ir::Signature { - call_conv: module.target_config().default_call_conv, - params: vec![ - AbiParam::new( - module.target_config().pointer_type(), /* *mut pthread_mutex_t */ - ), - AbiParam::new( - module.target_config().pointer_type(), /* *const pthread_mutex_attr_t */ - ), - ], - returns: vec![AbiParam::new(types::I32 /* c_int */)], - }, - ) - .unwrap(); - - let pthread_mutex_init = module.declare_func_in_func(pthread_mutex_init, bcx.func); - - let atomic_mutex = module.declare_data_in_func(atomic_mutex, bcx.func); - let atomic_mutex = bcx - .ins() - .global_value(module.target_config().pointer_type(), atomic_mutex); - - let nullptr = bcx.ins().iconst(module.target_config().pointer_type(), 0); - - bcx.ins().call(pthread_mutex_init, &[atomic_mutex, nullptr]); -} - -pub(crate) fn init_global_lock_constructor( - module: &mut impl Module, - constructor_name: &str, -) -> FuncId { - let sig = Signature::new(CallConv::SystemV); - let init_func_id = module - .declare_function(constructor_name, Linkage::Export, &sig) - .unwrap(); - - let mut ctx = Context::new(); - ctx.func = Function::with_name_signature(ExternalName::user(0, 0), sig); - { - let mut func_ctx = FunctionBuilderContext::new(); - let mut bcx = FunctionBuilder::new(&mut ctx.func, &mut func_ctx); - - let block = bcx.create_block(); - bcx.switch_to_block(block); - - crate::atomic_shim::init_global_lock(module, &mut bcx, false); - - bcx.ins().return_(&[]); - bcx.seal_all_blocks(); - bcx.finalize(); - } - module - .define_function( - init_func_id, - &mut ctx, - &mut cranelift_codegen::binemit::NullTrapSink {}, - ) - .unwrap(); - - init_func_id -} - -pub(crate) fn lock_global_lock(fx: &mut FunctionCx<'_, '_, impl Module>) { - let atomic_mutex = fx - .cx - .module - .declare_data( - "__cg_clif_global_atomic_mutex", - Linkage::Import, - true, - false, - ) - .unwrap(); - - let pthread_mutex_lock = fx - .cx - .module - .declare_function( - "pthread_mutex_lock", - Linkage::Import, - &cranelift_codegen::ir::Signature { - call_conv: fx.cx.module.target_config().default_call_conv, - params: vec![AbiParam::new( - fx.cx.module.target_config().pointer_type(), /* *mut pthread_mutex_t */ - )], - returns: vec![AbiParam::new(types::I32 /* c_int */)], - }, - ) - .unwrap(); - - let pthread_mutex_lock = fx - .cx - .module - .declare_func_in_func(pthread_mutex_lock, fx.bcx.func); - - let atomic_mutex = fx.cx.module.declare_data_in_func(atomic_mutex, fx.bcx.func); - let atomic_mutex = fx - .bcx - .ins() - .global_value(fx.cx.module.target_config().pointer_type(), atomic_mutex); - - fx.bcx.ins().call(pthread_mutex_lock, &[atomic_mutex]); -} - -pub(crate) fn unlock_global_lock(fx: &mut FunctionCx<'_, '_, impl Module>) { - let atomic_mutex = fx - .cx - .module - .declare_data( - "__cg_clif_global_atomic_mutex", - Linkage::Import, - true, - false, - ) - .unwrap(); - - let pthread_mutex_unlock = fx - .cx - .module - .declare_function( - "pthread_mutex_unlock", - Linkage::Import, - &cranelift_codegen::ir::Signature { - call_conv: fx.cx.module.target_config().default_call_conv, - params: vec![AbiParam::new( - fx.cx.module.target_config().pointer_type(), /* *mut pthread_mutex_t */ - )], - returns: vec![AbiParam::new(types::I32 /* c_int */)], - }, - ) - .unwrap(); - - let pthread_mutex_unlock = fx - .cx - .module - .declare_func_in_func(pthread_mutex_unlock, fx.bcx.func); - - let atomic_mutex = fx.cx.module.declare_data_in_func(atomic_mutex, fx.bcx.func); - let atomic_mutex = fx - .bcx - .ins() - .global_value(fx.cx.module.target_config().pointer_type(), atomic_mutex); - - fx.bcx.ins().call(pthread_mutex_unlock, &[atomic_mutex]); -} |