94 lines
3.8 KiB
Rust
94 lines
3.8 KiB
Rust
use std::ffi::CString;
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use crate::attributes;
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use libc::c_uint;
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use rustc::middle::allocator::AllocatorKind;
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use rustc::ty::TyCtxt;
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use rustc_allocator::{ALLOCATOR_METHODS, AllocatorTy};
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use crate::ModuleLlvm;
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use crate::llvm::{self, False, True};
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pub(crate) unsafe fn codegen(tcx: TyCtxt<'_>, mods: &mut ModuleLlvm, kind: AllocatorKind) {
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let llcx = &*mods.llcx;
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let llmod = mods.llmod();
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let usize = match &tcx.sess.target.target.target_pointer_width[..] {
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"16" => llvm::LLVMInt16TypeInContext(llcx),
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"32" => llvm::LLVMInt32TypeInContext(llcx),
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"64" => llvm::LLVMInt64TypeInContext(llcx),
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tws => bug!("Unsupported target word size for int: {}", tws),
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};
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let i8 = llvm::LLVMInt8TypeInContext(llcx);
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let i8p = llvm::LLVMPointerType(i8, 0);
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let void = llvm::LLVMVoidTypeInContext(llcx);
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for method in ALLOCATOR_METHODS {
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let mut args = Vec::with_capacity(method.inputs.len());
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for ty in method.inputs.iter() {
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match *ty {
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AllocatorTy::Layout => {
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args.push(usize); // size
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args.push(usize); // align
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}
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AllocatorTy::Ptr => args.push(i8p),
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AllocatorTy::Usize => args.push(usize),
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AllocatorTy::ResultPtr |
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AllocatorTy::Unit => panic!("invalid allocator arg"),
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}
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}
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let output = match method.output {
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AllocatorTy::ResultPtr => Some(i8p),
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AllocatorTy::Unit => None,
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AllocatorTy::Layout |
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AllocatorTy::Usize |
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AllocatorTy::Ptr => panic!("invalid allocator output"),
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};
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let ty = llvm::LLVMFunctionType(output.unwrap_or(void),
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args.as_ptr(),
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args.len() as c_uint,
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False);
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let name = CString::new(format!("__rust_{}", method.name)).unwrap();
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let llfn = llvm::LLVMRustGetOrInsertFunction(llmod,
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name.as_ptr(),
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ty);
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if tcx.sess.target.target.options.default_hidden_visibility {
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llvm::LLVMRustSetVisibility(llfn, llvm::Visibility::Hidden);
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}
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if tcx.sess.target.target.options.requires_uwtable {
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attributes::emit_uwtable(llfn, true);
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}
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let callee = CString::new(kind.fn_name(method.name)).unwrap();
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let callee = llvm::LLVMRustGetOrInsertFunction(llmod,
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callee.as_ptr(),
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ty);
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llvm::LLVMRustSetVisibility(callee, llvm::Visibility::Hidden);
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let llbb = llvm::LLVMAppendBasicBlockInContext(llcx,
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llfn,
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"entry\0".as_ptr() as *const _);
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let llbuilder = llvm::LLVMCreateBuilderInContext(llcx);
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llvm::LLVMPositionBuilderAtEnd(llbuilder, llbb);
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let args = args.iter().enumerate().map(|(i, _)| {
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llvm::LLVMGetParam(llfn, i as c_uint)
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}).collect::<Vec<_>>();
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let ret = llvm::LLVMRustBuildCall(llbuilder,
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callee,
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args.as_ptr(),
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args.len() as c_uint,
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None,
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"\0".as_ptr() as *const _);
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llvm::LLVMSetTailCall(ret, True);
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if output.is_some() {
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llvm::LLVMBuildRet(llbuilder, ret);
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} else {
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llvm::LLVMBuildRetVoid(llbuilder);
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}
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llvm::LLVMDisposeBuilder(llbuilder);
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}
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}
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