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Diffstat (limited to 'gcc/rust/backend/rust-compile-item.h')
| -rw-r--r-- | gcc/rust/backend/rust-compile-item.h | 180 |
1 files changed, 180 insertions, 0 deletions
diff --git a/gcc/rust/backend/rust-compile-item.h b/gcc/rust/backend/rust-compile-item.h new file mode 100644 index 0000000..dd07435 --- /dev/null +++ b/gcc/rust/backend/rust-compile-item.h @@ -0,0 +1,180 @@ +// Copyright (C) 2020 Free Software Foundation, Inc. + +// This file is part of GCC. + +// GCC is free software; you can redistribute it and/or modify it under +// the terms of the GNU General Public License as published by the Free +// Software Foundation; either version 3, or (at your option) any later +// version. + +// GCC is distributed in the hope that it will be useful, but WITHOUT ANY +// WARRANTY; without even the implied warranty of MERCHANTABILITY or +// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License +// for more details. + +// You should have received a copy of the GNU General Public License +// along with GCC; see the file COPYING3. If not see +// <http://www.gnu.org/licenses/>. + +#ifndef RUST_COMPILE_ITEM +#define RUST_COMPILE_ITEM + +#include "rust-compile-base.h" +#include "rust-compile-tyty.h" +#include "rust-compile-var-decl.h" +#include "rust-compile-stmt.h" + +namespace Rust { +namespace Compile { + +class CompileItem : public HIRCompileBase +{ +public: + static void compile (HIR::Item *item, Context *ctx) + { + CompileItem compiler (ctx); + item->accept_vis (compiler); + } + + virtual ~CompileItem () {} + + void visit (HIR::Function &function) + { + // items can be forward compiled which means we may not need to invoke this + // code + Bfunction *lookup = nullptr; + if (ctx->lookup_function_decl (function.get_mappings ().get_hirid (), + &lookup)) + { + // has this been added to the list then it must be finished + if (ctx->function_completed (lookup)) + { + printf ("returning early the function [%s] is completed!\n", + function.as_string ().c_str ()); + return; + } + } + + TyTy::TyBase *fnType; + if (!ctx->get_tyctx ()->lookup_type (function.get_mappings ().get_hirid (), + &fnType)) + { + rust_fatal_error (function.locus, "failed to lookup function type"); + return; + } + + // convert to the actual function type + auto compiled_fn_type = TyTyCompile::compile (ctx->get_backend (), fnType); + + Bfunction *fndecl + = ctx->get_backend ()->function (compiled_fn_type, function.function_name, + "" /* asm_name */, 0 /* flags */, + function.get_locus ()); + ctx->insert_function_decl (function.get_mappings ().get_hirid (), fndecl); + + // setup the params + TyTy::TyBase *tyret = TyTyExtractRetFromFnType::compile (fnType); + std::vector<TyTy::ParamType *> typarams + = TyTyExtractParamsFromFnType::compile (fnType); + std::vector<Bvariable *> param_vars; + + for (auto &it : typarams) + { + auto compiled_param + = TyTyCompileParam::compile (ctx->get_backend (), fndecl, it); + param_vars.push_back (compiled_param); + + ctx->insert_var_decl (it->get_ref (), compiled_param); + } + + if (!ctx->get_backend ()->function_set_parameters (fndecl, param_vars)) + { + rust_fatal_error (function.get_locus (), + "failed to setup parameter variables"); + return; + } + + // lookup locals + auto block_expr = function.function_body.get (); + auto body_mappings = block_expr->get_mappings (); + + Resolver::Rib *rib = nullptr; + if (!ctx->get_resolver ()->find_name_rib (body_mappings.get_nodeid (), + &rib)) + { + rust_fatal_error (function.get_locus (), + "failed to setup locals per block"); + return; + } + + std::vector<Bvariable *> locals; + rib->iterate_decls ([&] (NodeId n) mutable -> bool { + Resolver::Definition d; + bool ok = ctx->get_resolver ()->lookup_definition (n, &d); + rust_assert (ok); + + HIR::Stmt *decl = nullptr; + ok = ctx->get_mappings ()->resolve_nodeid_to_stmt (d.parent, &decl); + rust_assert (ok); + + Bvariable *compiled = CompileVarDecl::compile (fndecl, decl, ctx); + locals.push_back (compiled); + + return true; + }); + + Bblock *enclosing_scope = ctx->peek_enclosing_scope (); + HIR::BlockExpr *function_body = function.function_body.get (); + + Location start_location = function_body->get_locus (); + Location end_location = function_body->get_closing_locus (); + + Bblock *code_block + = ctx->get_backend ()->block (fndecl, enclosing_scope, locals, + start_location, end_location); + ctx->push_block (code_block); + + Bvariable *return_address = nullptr; + if (function.has_function_return_type ()) + { + Btype *return_type = TyTyCompile::compile (ctx->get_backend (), tyret); + + bool address_is_taken = false; + Bstatement *ret_var_stmt = nullptr; + + return_address = ctx->get_backend ()->temporary_variable ( + fndecl, code_block, return_type, NULL, address_is_taken, + function.get_locus (), &ret_var_stmt); + + ctx->add_statement (ret_var_stmt); + } + + ctx->push_fn (fndecl, return_address); + + // compile the block + function_body->iterate_stmts ([&] (HIR::Stmt *s) mutable -> bool { + CompileStmt::Compile (s, ctx); + return true; + }); + + ctx->pop_block (); + auto body = ctx->get_backend ()->block_statement (code_block); + if (!ctx->get_backend ()->function_set_body (fndecl, body)) + { + rust_error_at (function.get_locus (), "failed to set body to function"); + return; + } + + ctx->pop_fn (); + + ctx->push_function (fndecl); + } + +private: + CompileItem (Context *ctx) : HIRCompileBase (ctx) {} +}; + +} // namespace Compile +} // namespace Rust + +#endif // RUST_COMPILE_ITEM |