From 9b7d9c72b09bc268338b66e708b33213bbaae675 Mon Sep 17 00:00:00 2001 From: LemonBoy Date: Thu, 29 Oct 2020 10:24:03 +0100 Subject: stage1: Initial implementation of @extern --- src/stage1/ir.cpp | 187 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 187 insertions(+) (limited to 'src/stage1/ir.cpp') diff --git a/src/stage1/ir.cpp b/src/stage1/ir.cpp index 16884c6751..561a51271e 100644 --- a/src/stage1/ir.cpp +++ b/src/stage1/ir.cpp @@ -519,6 +519,8 @@ static void destroy_instruction_src(IrInstSrc *inst) { return heap::c_allocator.destroy(reinterpret_cast(inst)); case IrInstSrcIdExport: return heap::c_allocator.destroy(reinterpret_cast(inst)); + case IrInstSrcIdExtern: + return heap::c_allocator.destroy(reinterpret_cast(inst)); case IrInstSrcIdErrorReturnTrace: return heap::c_allocator.destroy(reinterpret_cast(inst)); case IrInstSrcIdErrorUnion: @@ -755,6 +757,8 @@ void destroy_instruction_gen(IrInstGen *inst) { return heap::c_allocator.destroy(reinterpret_cast(inst)); case IrInstGenIdWasmMemoryGrow: return heap::c_allocator.destroy(reinterpret_cast(inst)); + case IrInstGenIdExtern: + return heap::c_allocator.destroy(reinterpret_cast(inst)); } zig_unreachable(); } @@ -1555,6 +1559,10 @@ static constexpr IrInstSrcId ir_inst_id(IrInstSrcExport *) { return IrInstSrcIdExport; } +static constexpr IrInstSrcId ir_inst_id(IrInstSrcExtern *) { + return IrInstSrcIdExtern; +} + static constexpr IrInstSrcId ir_inst_id(IrInstSrcErrorReturnTrace *) { return IrInstSrcIdErrorReturnTrace; } @@ -1999,6 +2007,10 @@ static constexpr IrInstGenId ir_inst_id(IrInstGenWasmMemoryGrow *) { return IrInstGenIdWasmMemoryGrow; } +static constexpr IrInstGenId ir_inst_id(IrInstGenExtern *) { + return IrInstGenIdExtern; +} + template static T *ir_create_instruction(IrBuilderSrc *irb, Scope *scope, AstNode *source_node) { T *special_instruction = heap::c_allocator.create(); @@ -2807,6 +2819,33 @@ static IrInstSrc *ir_build_export(IrBuilderSrc *irb, Scope *scope, AstNode *sour return &export_instruction->base; } +static IrInstSrc *ir_build_extern(IrBuilderSrc *irb, Scope *scope, AstNode *source_node, + IrInstSrc *type, IrInstSrc *options) +{ + IrInstSrcExtern *extern_instruction = ir_build_instruction( + irb, scope, source_node); + extern_instruction->type = type; + extern_instruction->options = options; + + ir_ref_instruction(type, irb->current_basic_block); + ir_ref_instruction(options, irb->current_basic_block); + + return &extern_instruction->base; +} + +static IrInstGen *ir_build_extern_gen(IrAnalyze *ira, IrInst *source_instr, Buf *name, + GlobalLinkageId linkage, bool is_thread_local, ZigType *expr_type) +{ + IrInstGenExtern *instruction = ir_build_inst_gen(&ira->new_irb, + source_instr->scope, source_instr->source_node); + instruction->base.value->type = expr_type; + instruction->name = name; + instruction->linkage = linkage; + instruction->is_thread_local = is_thread_local; + + return &instruction->base; +} + static IrInstSrc *ir_build_load_ptr(IrBuilderSrc *irb, Scope *scope, AstNode *source_node, IrInstSrc *ptr) { IrInstSrcLoadPtr *instruction = ir_build_instruction(irb, scope, source_node); instruction->ptr = ptr; @@ -7376,6 +7415,30 @@ static IrInstSrc *ir_gen_builtin_fn_call(IrBuilderSrc *irb, Scope *scope, AstNod IrInstSrc *ir_export = ir_build_export(irb, scope, node, target_value, casted_options_value); return ir_lval_wrap(irb, scope, ir_export, lval, result_loc); } + case BuiltinFnIdExtern: + { + // Cast the options parameter to the options type + ZigType *options_type = get_builtin_type(irb->codegen, "ExternOptions"); + IrInstSrc *options_type_inst = ir_build_const_type(irb, scope, node, options_type); + ResultLocCast *result_loc_cast = ir_build_cast_result_loc(irb, options_type_inst, no_result_loc()); + + AstNode *type_node = node->data.fn_call_expr.params.at(0); + IrInstSrc *type_value = ir_gen_node(irb, type_node, scope); + if (type_value == irb->codegen->invalid_inst_src) + return type_value; + + AstNode *options_node = node->data.fn_call_expr.params.at(1); + IrInstSrc *options_value = ir_gen_node_extra(irb, options_node, + scope, LValNone, &result_loc_cast->base); + if (options_value == irb->codegen->invalid_inst_src) + return options_value; + + IrInstSrc *casted_options_value = ir_build_implicit_cast( + irb, scope, options_node, options_value, result_loc_cast); + + IrInstSrc *ir_extern = ir_build_extern(irb, scope, node, type_value, casted_options_value); + return ir_lval_wrap(irb, scope, ir_extern, lval, result_loc); + } case BuiltinFnIdErrorReturnTrace: { IrInstSrc *error_return_trace = ir_build_error_return_trace_src(irb, scope, node, @@ -19166,6 +19229,126 @@ static IrInstGen *ir_analyze_instruction_export(IrAnalyze *ira, IrInstSrcExport return ir_const_void(ira, &instruction->base.base); } +static void add_link_lib_symbol(IrAnalyze *ira, Buf *lib_name, Buf *symbol_name, AstNode *source_node); + +static IrInstGen *ir_analyze_instruction_extern(IrAnalyze *ira, IrInstSrcExtern *instruction) { + IrInstGen *type_inst = instruction->type->child; + if (type_is_invalid(type_inst->value->type)) + return ira->codegen->invalid_inst_gen; + + IrInstGen *options = instruction->options->child; + if (type_is_invalid(options->value->type)) + return ira->codegen->invalid_inst_gen; + + ZigType *options_type = options->value->type; + assert(options_type->id == ZigTypeIdStruct); + + TypeStructField *name_field = find_struct_type_field(options_type, buf_create_from_str("name")); + ir_assert(name_field != nullptr, &instruction->base.base); + IrInstGen *name_inst = ir_analyze_struct_value_field_value(ira, &instruction->base.base, options, name_field); + if (type_is_invalid(name_inst->value->type)) + return ira->codegen->invalid_inst_gen; + + TypeStructField *linkage_field = find_struct_type_field(options_type, buf_create_from_str("linkage")); + ir_assert(linkage_field != nullptr, &instruction->base.base); + IrInstGen *linkage_inst = ir_analyze_struct_value_field_value(ira, &instruction->base.base, options, linkage_field); + if (type_is_invalid(linkage_inst->value->type)) + return ira->codegen->invalid_inst_gen; + + TypeStructField *is_thread_local_field = find_struct_type_field(options_type, buf_create_from_str("is_thread_local")); + ir_assert(is_thread_local_field != nullptr, &instruction->base.base); + IrInstGen *is_thread_local_inst = ir_analyze_struct_value_field_value(ira, &instruction->base.base, options, is_thread_local_field); + if (type_is_invalid(is_thread_local_inst->value->type)) + return ira->codegen->invalid_inst_gen; + + TypeStructField *library_name_field = find_struct_type_field(options_type, buf_create_from_str("library_name")); + ir_assert(library_name_field != nullptr, &instruction->base.base); + IrInstGen *library_name_inst = ir_analyze_struct_value_field_value(ira, &instruction->base.base, options, library_name_field); + if (type_is_invalid(library_name_inst->value->type)) + return ira->codegen->invalid_inst_gen; + + // The `library_name` field is optional, we have to unwrap it first + IrInstGen *non_null_check = ir_analyze_test_non_null(ira, &instruction->base.base, library_name_inst); + bool is_non_null; + if (!ir_resolve_bool(ira, non_null_check, &is_non_null)) + return ira->codegen->invalid_inst_gen; + + IrInstGen *library_name_val_inst = nullptr; + if (is_non_null) { + library_name_val_inst = ir_analyze_optional_value_payload_value(ira, &instruction->base.base, library_name_inst, false); + if (type_is_invalid(library_name_val_inst->value->type)) + return ira->codegen->invalid_inst_gen; + } + + // Resolve all the comptime values + ZigType *value_type = ir_resolve_type(ira, type_inst); + if (type_is_invalid(value_type)) + return ira->codegen->invalid_inst_gen; + + if (get_src_ptr_type(value_type) == nullptr) { + ir_add_error(ira, &name_inst->base, + buf_sprintf("expected (optional) pointer type or function")); + return ira->codegen->invalid_inst_gen; + } + + Buf *symbol_name = ir_resolve_str(ira, name_inst); + if (!symbol_name) + return ira->codegen->invalid_inst_gen; + + if (buf_len(symbol_name) == 0) { + ir_add_error(ira, &name_inst->base, + buf_sprintf("extern symbol name cannot be empty")); + return ira->codegen->invalid_inst_gen; + } + + Buf *library_name = nullptr; + if (library_name_val_inst) { + library_name = ir_resolve_str(ira, library_name_val_inst); + if (!library_name) + return ira->codegen->invalid_inst_gen; + + if (buf_len(library_name) == 0) { + ir_add_error(ira, &library_name_inst->base, + buf_sprintf("library name name cannot be empty")); + return ira->codegen->invalid_inst_gen; + } + + add_link_lib_symbol(ira, library_name, symbol_name, instruction->base.base.source_node); + + buf_destroy(library_name); + } + + GlobalLinkageId global_linkage_id; + if (!ir_resolve_global_linkage(ira, linkage_inst, &global_linkage_id)) + return ira->codegen->invalid_inst_gen; + + bool is_thread_local; + if (!ir_resolve_bool(ira, is_thread_local_inst, &is_thread_local)) + return ira->codegen->invalid_inst_gen; + + ZigType *expr_type = value_type; + if (global_linkage_id == GlobalLinkageIdWeak && value_type->id != ZigTypeIdOptional) + expr_type = get_optional_type(ira->codegen, expr_type); + + // Create a bogus Tld object to keep track of the extern symbol. + // XXX: Find a better way to do this (in stage2). + TldFn *tld_fn = heap::c_allocator.create(); + tld_fn->base.id = TldIdFn; + tld_fn->base.source_node = instruction->base.base.source_node; + + auto entry = ira->codegen->external_symbol_names.put_unique(symbol_name, &tld_fn->base); + if (entry) { + AstNode *other_extern_node = entry->value->source_node; + ErrorMsg *msg = ir_add_error(ira, &instruction->base.base, + buf_sprintf("extern symbol collision: '%s'", buf_ptr(symbol_name))); + add_error_note(ira->codegen, msg, other_extern_node, buf_sprintf("other symbol is here")); + return ira->codegen->invalid_inst_gen; + } + + return ir_build_extern_gen(ira, &instruction->base.base, symbol_name, global_linkage_id, + is_thread_local, expr_type); +} + static bool exec_has_err_ret_trace(CodeGen *g, IrExecutableSrc *exec) { ZigFn *fn_entry = exec_fn_entry(exec); return fn_entry != nullptr && fn_entry->calls_or_awaits_errorable_fn && g->have_err_ret_tracing; @@ -32110,6 +32293,8 @@ static IrInstGen *ir_analyze_instruction_base(IrAnalyze *ira, IrInstSrc *instruc return ir_analyze_instruction_tag_type(ira, (IrInstSrcTagType *)instruction); case IrInstSrcIdExport: return ir_analyze_instruction_export(ira, (IrInstSrcExport *)instruction); + case IrInstSrcIdExtern: + return ir_analyze_instruction_extern(ira, (IrInstSrcExtern *)instruction); case IrInstSrcIdErrorReturnTrace: return ir_analyze_instruction_error_return_trace(ira, (IrInstSrcErrorReturnTrace *)instruction); case IrInstSrcIdErrorUnion: @@ -32345,6 +32530,7 @@ bool ir_inst_gen_has_side_effects(IrInstGen *instruction) { case IrInstGenIdAwait: case IrInstGenIdSpillBegin: case IrInstGenIdWasmMemoryGrow: + case IrInstGenIdExtern: return true; case IrInstGenIdPhi: @@ -32465,6 +32651,7 @@ bool ir_inst_src_has_side_effects(IrInstSrc *instruction) { case IrInstSrcIdPtrType: case IrInstSrcIdSetAlignStack: case IrInstSrcIdExport: + case IrInstSrcIdExtern: case IrInstSrcIdSaveErrRetAddr: case IrInstSrcIdAddImplicitReturnType: case IrInstSrcIdAtomicRmw: -- cgit v1.2.3