struct AstNode; struct Scope; enum ParseFileError { ParseFile_None, ParseFile_WrongExtension, ParseFile_InvalidFile, ParseFile_EmptyFile, ParseFile_Permission, ParseFile_NotFound, ParseFile_InvalidToken, ParseFile_Count, }; typedef gbArray(AstNode *) AstNodeArray; struct AstFile { gbArena arena; Tokenizer tokenizer; gbArray(Token) tokens; Token * cursor; // NOTE(bill): Current token, easy to peek forward and backwards if needed // >= 0: In Expression // < 0: In Control Clause // NOTE(bill): Used to prevent type literals in control clauses isize expr_level; AstNodeArray decls; b32 is_global_scope; AstNode *curr_proc; isize scope_level; Scope * scope; // NOTE(bill): Created in checker ErrorCollector error_collector; // TODO(bill): Error recovery // NOTE(bill): Error recovery #define PARSER_MAX_FIX_COUNT 6 isize fix_count; TokenPos fix_prev_pos; }; struct ImportedFile { String path; TokenPos pos; // #import }; struct Parser { String init_fullpath; gbArray(AstFile) files; gbArray(ImportedFile) imports; gbArray(String) libraries; gbArray(String) system_libraries; isize load_index; isize total_token_count; }; enum DeclKind { Declaration_Invalid, Declaration_Mutable, Declaration_Immutable, Declaration_Count, }; enum ProcTag { ProcTag_bounds_check = GB_BIT(0), ProcTag_no_bounds_check = GB_BIT(1), ProcTag_foreign = GB_BIT(2), ProcTag_inline = GB_BIT(3), ProcTag_no_inline = GB_BIT(4), }; enum VarDeclTag { VarDeclTag_thread_local = GB_BIT(0), }; enum TypeFlag : u32 { TypeFlag_thread_local = GB_BIT(0), TypeFlag_volatile = GB_BIT(1), TypeFlag_atomic = GB_BIT(2), }; enum StmtStateFlag : u32 { StmtStateFlag_bounds_check = GB_BIT(0), StmtStateFlag_no_bounds_check = GB_BIT(1), }; enum CallExprKind { CallExpr_Prefix, // call(...) CallExpr_Postfix, // a'call CallExpr_Infix, // a ''call b }; AstNodeArray make_ast_node_array(AstFile *f) { AstNodeArray a; gb_array_init(a, gb_arena_allocator(&f->arena)); GB_ASSERT(a != NULL); return a; } #define AST_NODE_KINDS \ AST_NODE_KIND(Invalid, "invalid node", struct{}) \ AST_NODE_KIND(BasicLit, "basic literal", Token) \ AST_NODE_KIND(Ident, "identifier", Token) \ AST_NODE_KIND(Ellipsis, "ellipsis", struct { \ Token token; \ AstNode *expr; \ }) \ AST_NODE_KIND(ProcLit, "procedure literal", struct { \ AstNode *type; \ AstNode *body; \ u64 tags; \ }) \ AST_NODE_KIND(CompoundLit, "compound literal", struct { \ AstNode *type; \ AstNodeArray elems; \ Token open, close; \ }) \ AST_NODE_KIND(_ExprBegin, "", struct{}) \ AST_NODE_KIND(BadExpr, "bad expression", struct { Token begin, end; }) \ AST_NODE_KIND(TagExpr, "tag expression", struct { Token token, name; AstNode *expr; }) \ AST_NODE_KIND(UnaryExpr, "unary expression", struct { Token op; AstNode *expr; }) \ AST_NODE_KIND(BinaryExpr, "binary expression", struct { Token op; AstNode *left, *right; } ) \ AST_NODE_KIND(ParenExpr, "parentheses expression", struct { AstNode *expr; Token open, close; }) \ AST_NODE_KIND(SelectorExpr, "selector expression", struct { Token token; AstNode *expr, *selector; }) \ AST_NODE_KIND(IndexExpr, "index expression", struct { AstNode *expr, *index; Token open, close; }) \ AST_NODE_KIND(DerefExpr, "dereference expression", struct { Token op; AstNode *expr; }) \ AST_NODE_KIND(CallExpr, "call expression", struct { \ AstNode *proc; \ gbArray(AstNode *) args; \ Token open, close; \ Token ellipsis; \ CallExprKind kind; \ }) \ AST_NODE_KIND(SliceExpr, "slice expression", struct { \ AstNode *expr; \ Token open, close; \ AstNode *low, *high, *max; \ b32 triple_indexed; \ }) \ AST_NODE_KIND(FieldValue, "field value", struct { Token eq; AstNode *field, *value; }) \ AST_NODE_KIND(_ExprEnd, "", struct{}) \ AST_NODE_KIND(_StmtBegin, "", struct{}) \ AST_NODE_KIND(BadStmt, "bad statement", struct { Token begin, end; }) \ AST_NODE_KIND(EmptyStmt, "empty statement", struct { Token token; }) \ AST_NODE_KIND(ExprStmt, "expression statement", struct { AstNode *expr; } ) \ AST_NODE_KIND(IncDecStmt, "increment/decrement statement", struct { Token op; AstNode *expr; }) \ AST_NODE_KIND(TagStmt, "tag statement", struct { \ Token token; \ Token name; \ AstNode *stmt; \ }) \ AST_NODE_KIND(AssignStmt, "assign statement", struct { \ Token op; \ AstNodeArray lhs, rhs; \ }) \ AST_NODE_KIND(_ComplexStmtBegin, "", struct{}) \ AST_NODE_KIND(BlockStmt, "block statement", struct { \ AstNodeArray stmts; \ Token open, close; \ }) \ AST_NODE_KIND(IfStmt, "if statement", struct { \ Token token; \ AstNode *init; \ AstNode *cond; \ AstNode *body; \ AstNode *else_stmt; \ }) \ AST_NODE_KIND(ReturnStmt, "return statement", struct { \ Token token; \ AstNodeArray results; \ }) \ AST_NODE_KIND(ForStmt, "for statement", struct { \ Token token; \ AstNode *init, *cond, *post; \ AstNode *body; \ }) \ AST_NODE_KIND(CaseClause, "case clause", struct { \ Token token; \ AstNodeArray list, stmts; \ }) \ AST_NODE_KIND(MatchStmt, "match statement", struct { \ Token token; \ AstNode *init, *tag; \ AstNode *body; \ }) \ AST_NODE_KIND(TypeMatchStmt, "type match statement", struct { \ Token token; \ AstNode *tag, *var; \ AstNode *body; \ }) \ AST_NODE_KIND(DeferStmt, "defer statement", struct { Token token; AstNode *stmt; }) \ AST_NODE_KIND(BranchStmt, "branch statement", struct { Token token; }) \ AST_NODE_KIND(UsingStmt, "using statement", struct { Token token; AstNode *node; }) \ AST_NODE_KIND(AsmOperand, "assembly operand", struct { \ Token string; \ AstNode *operand; \ }) \ AST_NODE_KIND(AsmStmt, "assembly statement", struct { \ Token token; \ b32 is_volatile; \ Token open, close; \ Token code_string; \ AstNode *output_list; \ AstNode *input_list; \ AstNode *clobber_list; \ isize output_count, input_count, clobber_count; \ }) \ \ AST_NODE_KIND(_ComplexStmtEnd, "", struct{}) \ AST_NODE_KIND(_StmtEnd, "", struct{}) \ AST_NODE_KIND(_DeclBegin, "", struct{}) \ AST_NODE_KIND(BadDecl, "bad declaration", struct { Token begin, end; }) \ AST_NODE_KIND(VarDecl, "variable declaration", struct { \ DeclKind kind; \ u32 tags; \ b32 is_using; \ AstNodeArray names; \ AstNode *type; \ AstNodeArray values; \ }) \ AST_NODE_KIND(ProcDecl, "procedure declaration", struct { \ AstNode *name; \ AstNode *type; \ AstNode *body; \ u64 tags; \ String foreign_name; \ }) \ AST_NODE_KIND(TypeDecl, "type declaration", struct { Token token; AstNode *name, *type; }) \ AST_NODE_KIND(ImportDecl, "import declaration", struct { \ Token token, relpath; \ String fullpath; \ Token import_name; \ }) \ AST_NODE_KIND(ForeignSystemLibrary, "foreign system library", struct { Token token, filepath; }) \ AST_NODE_KIND(_DeclEnd, "", struct{}) \ AST_NODE_KIND(_TypeBegin, "", struct{}) \ AST_NODE_KIND(Field, "field", struct { \ AstNodeArray names; \ AstNode *type; \ b32 is_using; \ }) \ AST_NODE_KIND(ProcType, "procedure type", struct { \ Token token; \ AstNodeArray params; \ AstNodeArray results; \ }) \ AST_NODE_KIND(PointerType, "pointer type", struct { \ Token token; \ AstNode *type; \ }) \ AST_NODE_KIND(ArrayType, "array type", struct { \ Token token; \ AstNode *count; \ AstNode *elem; \ }) \ AST_NODE_KIND(VectorType, "vector type", struct { \ Token token; \ AstNode *count; \ AstNode *elem; \ }) \ AST_NODE_KIND(StructType, "struct type", struct { \ Token token; \ AstNodeArray decls; \ isize decl_count; \ b32 is_packed; \ b32 is_ordered; \ }) \ AST_NODE_KIND(UnionType, "union type", struct { \ Token token; \ AstNodeArray decls; \ isize decl_count; \ }) \ AST_NODE_KIND(RawUnionType, "raw union type", struct { \ Token token; \ AstNodeArray decls; \ isize decl_count; \ }) \ AST_NODE_KIND(EnumType, "enum type", struct { \ Token token; \ AstNode *base_type; \ AstNodeArray fields; \ }) \ AST_NODE_KIND(_TypeEnd, "", struct{}) \ AST_NODE_KIND(Count, "", struct{}) enum AstNodeKind { #define AST_NODE_KIND(_kind_name_, ...) GB_JOIN2(AstNode_, _kind_name_), AST_NODE_KINDS #undef AST_NODE_KIND }; String const ast_node_strings[] = { #define AST_NODE_KIND(_kind_name_, name, ...) {cast(u8 *)name, gb_size_of(name)-1}, AST_NODE_KINDS #undef AST_NODE_KIND }; struct AstNode { AstNodeKind kind; // AstNode *prev, *next; // NOTE(bill): allow for Linked list u32 type_flags; u32 stmt_state_flags; union { #define AST_NODE_KIND(_kind_name_, name, ...) __VA_ARGS__ _kind_name_; AST_NODE_KINDS #undef AST_NODE_KIND }; }; #define ast_node(n_, Kind_, node_) auto *n_ = &(node_)->Kind_; GB_ASSERT((node_)->kind == GB_JOIN2(AstNode_, Kind_)) #define case_ast_node(n_, Kind_, node_) case GB_JOIN2(AstNode_, Kind_): { ast_node(n_, Kind_, node_); #define case_end } break; gb_inline b32 is_ast_node_expr(AstNode *node) { return gb_is_between(node->kind, AstNode__ExprBegin+1, AstNode__ExprEnd-1); } gb_inline b32 is_ast_node_stmt(AstNode *node) { return gb_is_between(node->kind, AstNode__StmtBegin+1, AstNode__StmtEnd-1); } gb_inline b32 is_ast_node_complex_stmt(AstNode *node) { return gb_is_between(node->kind, AstNode__ComplexStmtBegin+1, AstNode__ComplexStmtEnd-1); } gb_inline b32 is_ast_node_decl(AstNode *node) { return gb_is_between(node->kind, AstNode__DeclBegin+1, AstNode__DeclEnd-1); } gb_inline b32 is_ast_node_type(AstNode *node) { return gb_is_between(node->kind, AstNode__TypeBegin+1, AstNode__TypeEnd-1); } Token ast_node_token(AstNode *node) { switch (node->kind) { case AstNode_BasicLit: return node->BasicLit; case AstNode_Ident: return node->Ident; case AstNode_ProcLit: return ast_node_token(node->ProcLit.type); case AstNode_CompoundLit: return ast_node_token(node->CompoundLit.type); case AstNode_TagExpr: return node->TagExpr.token; case AstNode_BadExpr: return node->BadExpr.begin; case AstNode_UnaryExpr: return node->UnaryExpr.op; case AstNode_BinaryExpr: return ast_node_token(node->BinaryExpr.left); case AstNode_ParenExpr: return node->ParenExpr.open; case AstNode_CallExpr: return ast_node_token(node->CallExpr.proc); case AstNode_SelectorExpr: return ast_node_token(node->SelectorExpr.selector); case AstNode_IndexExpr: return node->IndexExpr.open; case AstNode_SliceExpr: return node->SliceExpr.open; case AstNode_Ellipsis: return node->Ellipsis.token; case AstNode_FieldValue: return node->FieldValue.eq; case AstNode_DerefExpr: return node->DerefExpr.op; case AstNode_BadStmt: return node->BadStmt.begin; case AstNode_EmptyStmt: return node->EmptyStmt.token; case AstNode_ExprStmt: return ast_node_token(node->ExprStmt.expr); case AstNode_TagStmt: return node->TagStmt.token; case AstNode_IncDecStmt: return node->IncDecStmt.op; case AstNode_AssignStmt: return node->AssignStmt.op; case AstNode_BlockStmt: return node->BlockStmt.open; case AstNode_IfStmt: return node->IfStmt.token; case AstNode_ReturnStmt: return node->ReturnStmt.token; case AstNode_ForStmt: return node->ForStmt.token; case AstNode_MatchStmt: return node->MatchStmt.token; case AstNode_CaseClause: return node->CaseClause.token; case AstNode_DeferStmt: return node->DeferStmt.token; case AstNode_BranchStmt: return node->BranchStmt.token; case AstNode_UsingStmt: return node->UsingStmt.token; case AstNode_AsmStmt: return node->AsmStmt.token; case AstNode_BadDecl: return node->BadDecl.begin; case AstNode_VarDecl: return ast_node_token(node->VarDecl.names[0]); case AstNode_ProcDecl: return node->ProcDecl.name->Ident; case AstNode_TypeDecl: return node->TypeDecl.token; case AstNode_ImportDecl: return node->ImportDecl.token; case AstNode_ForeignSystemLibrary: return node->ForeignSystemLibrary.token; case AstNode_Field: { if (node->Field.names) return ast_node_token(node->Field.names[0]); else return ast_node_token(node->Field.type); } case AstNode_ProcType: return node->ProcType.token; case AstNode_PointerType: return node->PointerType.token; case AstNode_ArrayType: return node->ArrayType.token; case AstNode_VectorType: return node->VectorType.token; case AstNode_StructType: return node->StructType.token; case AstNode_UnionType: return node->UnionType.token; case AstNode_RawUnionType: return node->RawUnionType.token; case AstNode_EnumType: return node->EnumType.token; } return empty_token; } HashKey hash_token(Token t) { return hash_string(t.string); } #define ast_file_err(f, token, fmt, ...) ast_file_err_(f, __FUNCTION__, token, fmt, ##__VA_ARGS__) void ast_file_err_(AstFile *file, char *function, Token token, char *fmt, ...) { // NOTE(bill): Duplicate error, skip it if (!token_pos_are_equal(file->error_collector.prev, token.pos)) { va_list va; file->error_collector.prev = token.pos; #if 0 gb_printf_err("%s()\n", function); #endif va_start(va, fmt); gb_printf_err("%.*s(%td:%td) Syntax error: %s\n", LIT(token.pos.file), token.pos.line, token.pos.column, gb_bprintf_va(fmt, va)); va_end(va); } file->error_collector.count++; } // NOTE(bill): And this below is why is I/we need a new language! Discriminated unions are a pain in C/C++ gb_inline AstNode *make_node(AstFile *f, AstNodeKind kind) { gbArena *arena = &f->arena; if (gb_arena_size_remaining(arena, GB_DEFAULT_MEMORY_ALIGNMENT) <= gb_size_of(AstNode)) { // NOTE(bill): If a syntax error is so bad, just quit! gb_exit(1); } AstNode *node = gb_alloc_item(gb_arena_allocator(arena), AstNode); node->kind = kind; return node; } gb_inline AstNode *make_bad_expr(AstFile *f, Token begin, Token end) { AstNode *result = make_node(f, AstNode_BadExpr); result->BadExpr.begin = begin; result->BadExpr.end = end; return result; } gb_inline AstNode *make_tag_expr(AstFile *f, Token token, Token name, AstNode *expr) { AstNode *result = make_node(f, AstNode_TagExpr); result->TagExpr.token = token; result->TagExpr.name = name; result->TagExpr.expr = expr; return result; } gb_inline AstNode *make_tag_stmt(AstFile *f, Token token, Token name, AstNode *stmt) { AstNode *result = make_node(f, AstNode_TagStmt); result->TagStmt.token = token; result->TagStmt.name = name; result->TagStmt.stmt = stmt; return result; } gb_inline AstNode *make_unary_expr(AstFile *f, Token op, AstNode *expr) { AstNode *result = make_node(f, AstNode_UnaryExpr); result->UnaryExpr.op = op; result->UnaryExpr.expr = expr; return result; } gb_inline AstNode *make_binary_expr(AstFile *f, Token op, AstNode *left, AstNode *right) { AstNode *result = make_node(f, AstNode_BinaryExpr); if (left == NULL) { ast_file_err(f, op, "No lhs expression for binary expression `%.*s`", LIT(op.string)); left = make_bad_expr(f, op, op); } if (right == NULL) { ast_file_err(f, op, "No rhs expression for binary expression `%.*s`", LIT(op.string)); right = make_bad_expr(f, op, op); } result->BinaryExpr.op = op; result->BinaryExpr.left = left; result->BinaryExpr.right = right; return result; } gb_inline AstNode *make_paren_expr(AstFile *f, AstNode *expr, Token open, Token close) { AstNode *result = make_node(f, AstNode_ParenExpr); result->ParenExpr.expr = expr; result->ParenExpr.open = open; result->ParenExpr.close = close; return result; } gb_inline AstNode *make_call_expr(AstFile *f, AstNode *proc, gbArray(AstNode *)args, Token open, Token close, Token ellipsis) { AstNode *result = make_node(f, AstNode_CallExpr); result->CallExpr.proc = proc; result->CallExpr.args = args; result->CallExpr.open = open; result->CallExpr.close = close; result->CallExpr.ellipsis = ellipsis; return result; } gb_inline AstNode *make_selector_expr(AstFile *f, Token token, AstNode *expr, AstNode *selector) { AstNode *result = make_node(f, AstNode_SelectorExpr); result->SelectorExpr.expr = expr; result->SelectorExpr.selector = selector; return result; } gb_inline AstNode *make_index_expr(AstFile *f, AstNode *expr, AstNode *index, Token open, Token close) { AstNode *result = make_node(f, AstNode_IndexExpr); result->IndexExpr.expr = expr; result->IndexExpr.index = index; result->IndexExpr.open = open; result->IndexExpr.close = close; return result; } gb_inline AstNode *make_slice_expr(AstFile *f, AstNode *expr, Token open, Token close, AstNode *low, AstNode *high, AstNode *max, b32 triple_indexed) { AstNode *result = make_node(f, AstNode_SliceExpr); result->SliceExpr.expr = expr; result->SliceExpr.open = open; result->SliceExpr.close = close; result->SliceExpr.low = low; result->SliceExpr.high = high; result->SliceExpr.max = max; result->SliceExpr.triple_indexed = triple_indexed; return result; } gb_inline AstNode *make_deref_expr(AstFile *f, AstNode *expr, Token op) { AstNode *result = make_node(f, AstNode_DerefExpr); result->DerefExpr.expr = expr; result->DerefExpr.op = op; return result; } gb_inline AstNode *make_basic_lit(AstFile *f, Token basic_lit) { AstNode *result = make_node(f, AstNode_BasicLit); result->BasicLit = basic_lit; return result; } gb_inline AstNode *make_ident(AstFile *f, Token token) { AstNode *result = make_node(f, AstNode_Ident); result->Ident = token; return result; } gb_inline AstNode *make_ellipsis(AstFile *f, Token token, AstNode *expr) { AstNode *result = make_node(f, AstNode_Ellipsis); result->Ellipsis.token = token; result->Ellipsis.expr = expr; return result; } gb_inline AstNode *make_proc_lit(AstFile *f, AstNode *type, AstNode *body, u64 tags) { AstNode *result = make_node(f, AstNode_ProcLit); result->ProcLit.type = type; result->ProcLit.body = body; result->ProcLit.tags = tags; return result; } gb_inline AstNode *make_field_value(AstFile *f, AstNode *field, AstNode *value, Token eq) { AstNode *result = make_node(f, AstNode_FieldValue); result->FieldValue.field = field; result->FieldValue.value = value; result->FieldValue.eq = eq; return result; } gb_inline AstNode *make_compound_lit(AstFile *f, AstNode *type, AstNodeArray elems, Token open, Token close) { AstNode *result = make_node(f, AstNode_CompoundLit); result->CompoundLit.type = type; result->CompoundLit.elems = elems; result->CompoundLit.open = open; result->CompoundLit.close = close; return result; } gb_inline AstNode *make_bad_stmt(AstFile *f, Token begin, Token end) { AstNode *result = make_node(f, AstNode_BadStmt); result->BadStmt.begin = begin; result->BadStmt.end = end; return result; } gb_inline AstNode *make_empty_stmt(AstFile *f, Token token) { AstNode *result = make_node(f, AstNode_EmptyStmt); result->EmptyStmt.token = token; return result; } gb_inline AstNode *make_expr_stmt(AstFile *f, AstNode *expr) { AstNode *result = make_node(f, AstNode_ExprStmt); result->ExprStmt.expr = expr; return result; } gb_inline AstNode *make_inc_dec_stmt(AstFile *f, Token op, AstNode *expr) { AstNode *result = make_node(f, AstNode_IncDecStmt); result->IncDecStmt.op = op; result->IncDecStmt.expr = expr; return result; } gb_inline AstNode *make_assign_stmt(AstFile *f, Token op, AstNodeArray lhs, AstNodeArray rhs) { AstNode *result = make_node(f, AstNode_AssignStmt); result->AssignStmt.op = op; result->AssignStmt.lhs = lhs; result->AssignStmt.rhs = rhs; return result; } gb_inline AstNode *make_block_stmt(AstFile *f, AstNodeArray stmts, Token open, Token close) { AstNode *result = make_node(f, AstNode_BlockStmt); result->BlockStmt.stmts = stmts; result->BlockStmt.open = open; result->BlockStmt.close = close; return result; } gb_inline AstNode *make_if_stmt(AstFile *f, Token token, AstNode *init, AstNode *cond, AstNode *body, AstNode *else_stmt) { AstNode *result = make_node(f, AstNode_IfStmt); result->IfStmt.token = token; result->IfStmt.init = init; result->IfStmt.cond = cond; result->IfStmt.body = body; result->IfStmt.else_stmt = else_stmt; return result; } gb_inline AstNode *make_return_stmt(AstFile *f, Token token, AstNodeArray results) { AstNode *result = make_node(f, AstNode_ReturnStmt); result->ReturnStmt.token = token; result->ReturnStmt.results = results; return result; } gb_inline AstNode *make_for_stmt(AstFile *f, Token token, AstNode *init, AstNode *cond, AstNode *post, AstNode *body) { AstNode *result = make_node(f, AstNode_ForStmt); result->ForStmt.token = token; result->ForStmt.init = init; result->ForStmt.cond = cond; result->ForStmt.post = post; result->ForStmt.body = body; return result; } gb_inline AstNode *make_match_stmt(AstFile *f, Token token, AstNode *init, AstNode *tag, AstNode *body) { AstNode *result = make_node(f, AstNode_MatchStmt); result->MatchStmt.token = token; result->MatchStmt.init = init; result->MatchStmt.tag = tag; result->MatchStmt.body = body; return result; } gb_inline AstNode *make_type_match_stmt(AstFile *f, Token token, AstNode *tag, AstNode *var, AstNode *body) { AstNode *result = make_node(f, AstNode_TypeMatchStmt); result->TypeMatchStmt.token = token; result->TypeMatchStmt.tag = tag; result->TypeMatchStmt.var = var; result->TypeMatchStmt.body = body; return result; } gb_inline AstNode *make_case_clause(AstFile *f, Token token, AstNodeArray list, AstNodeArray stmts) { AstNode *result = make_node(f, AstNode_CaseClause); result->CaseClause.token = token; result->CaseClause.list = list; result->CaseClause.stmts = stmts; return result; } gb_inline AstNode *make_defer_stmt(AstFile *f, Token token, AstNode *stmt) { AstNode *result = make_node(f, AstNode_DeferStmt); result->DeferStmt.token = token; result->DeferStmt.stmt = stmt; return result; } gb_inline AstNode *make_branch_stmt(AstFile *f, Token token) { AstNode *result = make_node(f, AstNode_BranchStmt); result->BranchStmt.token = token; return result; } gb_inline AstNode *make_using_stmt(AstFile *f, Token token, AstNode *node) { AstNode *result = make_node(f, AstNode_UsingStmt); result->UsingStmt.token = token; result->UsingStmt.node = node; return result; } gb_inline AstNode *make_asm_operand(AstFile *f, Token string, AstNode *operand) { AstNode *result = make_node(f, AstNode_AsmOperand); result->AsmOperand.string = string; result->AsmOperand.operand = operand; return result; } gb_inline AstNode *make_asm_stmt(AstFile *f, Token token, b32 is_volatile, Token open, Token close, Token code_string, AstNode *output_list, AstNode *input_list, AstNode *clobber_list, isize output_count, isize input_count, isize clobber_count) { AstNode *result = make_node(f, AstNode_AsmStmt); result->AsmStmt.token = token; result->AsmStmt.is_volatile = is_volatile; result->AsmStmt.open = open; result->AsmStmt.close = close; result->AsmStmt.code_string = code_string; result->AsmStmt.output_list = output_list; result->AsmStmt.input_list = input_list; result->AsmStmt.clobber_list = clobber_list; result->AsmStmt.output_count = output_count; result->AsmStmt.input_count = input_count; result->AsmStmt.clobber_count = clobber_count; return result; } gb_inline AstNode *make_bad_decl(AstFile *f, Token begin, Token end) { AstNode *result = make_node(f, AstNode_BadDecl); result->BadDecl.begin = begin; result->BadDecl.end = end; return result; } gb_inline AstNode *make_var_decl(AstFile *f, DeclKind kind, AstNodeArray names, AstNode *type, AstNodeArray values) { AstNode *result = make_node(f, AstNode_VarDecl); result->VarDecl.kind = kind; result->VarDecl.names = names; result->VarDecl.type = type; result->VarDecl.values = values; return result; } gb_inline AstNode *make_field(AstFile *f, AstNodeArray names, AstNode *type, b32 is_using) { AstNode *result = make_node(f, AstNode_Field); result->Field.names = names; result->Field.type = type; result->Field.is_using = is_using; return result; } gb_inline AstNode *make_proc_type(AstFile *f, Token token, AstNodeArray params, AstNodeArray results) { AstNode *result = make_node(f, AstNode_ProcType); result->ProcType.token = token; result->ProcType.params = params; result->ProcType.results = results; return result; } gb_inline AstNode *make_proc_decl(AstFile *f, AstNode *name, AstNode *proc_type, AstNode *body, u64 tags, String foreign_name) { AstNode *result = make_node(f, AstNode_ProcDecl); result->ProcDecl.name = name; result->ProcDecl.type = proc_type; result->ProcDecl.body = body; result->ProcDecl.tags = tags; result->ProcDecl.foreign_name = foreign_name; return result; } gb_inline AstNode *make_pointer_type(AstFile *f, Token token, AstNode *type) { AstNode *result = make_node(f, AstNode_PointerType); result->PointerType.token = token; result->PointerType.type = type; return result; } gb_inline AstNode *make_array_type(AstFile *f, Token token, AstNode *count, AstNode *elem) { AstNode *result = make_node(f, AstNode_ArrayType); result->ArrayType.token = token; result->ArrayType.count = count; result->ArrayType.elem = elem; return result; } gb_inline AstNode *make_vector_type(AstFile *f, Token token, AstNode *count, AstNode *elem) { AstNode *result = make_node(f, AstNode_VectorType); result->VectorType.token = token; result->VectorType.count = count; result->VectorType.elem = elem; return result; } gb_inline AstNode *make_struct_type(AstFile *f, Token token, AstNodeArray decls, isize decl_count, b32 is_packed, b32 is_ordered) { AstNode *result = make_node(f, AstNode_StructType); result->StructType.token = token; result->StructType.decls = decls; result->StructType.decl_count = decl_count; result->StructType.is_packed = is_packed; result->StructType.is_ordered = is_ordered; return result; } gb_inline AstNode *make_union_type(AstFile *f, Token token, AstNodeArray decls, isize decl_count) { AstNode *result = make_node(f, AstNode_UnionType); result->UnionType.token = token; result->UnionType.decls = decls; result->UnionType.decl_count = decl_count; return result; } gb_inline AstNode *make_raw_union_type(AstFile *f, Token token, AstNodeArray decls, isize decl_count) { AstNode *result = make_node(f, AstNode_RawUnionType); result->RawUnionType.token = token; result->RawUnionType.decls = decls; result->RawUnionType.decl_count = decl_count; return result; } gb_inline AstNode *make_enum_type(AstFile *f, Token token, AstNode *base_type, AstNodeArray fields) { AstNode *result = make_node(f, AstNode_EnumType); result->EnumType.token = token; result->EnumType.base_type = base_type; result->EnumType.fields = fields; return result; } gb_inline AstNode *make_type_decl(AstFile *f, Token token, AstNode *name, AstNode *type) { AstNode *result = make_node(f, AstNode_TypeDecl); result->TypeDecl.token = token; result->TypeDecl.name = name; result->TypeDecl.type = type; return result; } gb_inline AstNode *make_import_decl(AstFile *f, Token token, Token relpath, Token import_name) { AstNode *result = make_node(f, AstNode_ImportDecl); result->ImportDecl.token = token; result->ImportDecl.relpath = relpath; result->ImportDecl.import_name = import_name; return result; } gb_inline AstNode *make_foreign_system_library(AstFile *f, Token token, Token filepath) { AstNode *result = make_node(f, AstNode_ForeignSystemLibrary); result->ForeignSystemLibrary.token = token; result->ForeignSystemLibrary.filepath = filepath; return result; } gb_inline b32 next_token(AstFile *f) { if (f->cursor+1 < f->tokens + gb_array_count(f->tokens)) { f->cursor++; return true; } else { ast_file_err(f, f->cursor[0], "Token is EOF"); return false; } } gb_inline Token expect_token(AstFile *f, TokenKind kind) { Token prev = f->cursor[0]; if (prev.kind != kind) { ast_file_err(f, f->cursor[0], "Expected `%.*s`, got `%.*s`", LIT(token_strings[kind]), LIT(token_strings[prev.kind])); } next_token(f); return prev; } gb_inline Token expect_operator(AstFile *f) { Token prev = f->cursor[0]; if (!gb_is_between(prev.kind, Token__OperatorBegin+1, Token__OperatorEnd-1)) { ast_file_err(f, f->cursor[0], "Expected an operator, got `%.*s`", LIT(token_strings[prev.kind])); } next_token(f); return prev; } gb_inline Token expect_keyword(AstFile *f) { Token prev = f->cursor[0]; if (!gb_is_between(prev.kind, Token__KeywordBegin+1, Token__KeywordEnd-1)) { ast_file_err(f, f->cursor[0], "Expected a keyword, got `%.*s`", LIT(token_strings[prev.kind])); } next_token(f); return prev; } gb_inline b32 allow_token(AstFile *f, TokenKind kind) { Token prev = f->cursor[0]; if (prev.kind == kind) { next_token(f); return true; } return false; } b32 is_blank_ident(String str) { if (str.len == 1) { return str.text[0] == '_'; } return false; } void fix_advance_to_next_stmt(AstFile *f) { // TODO(bill): fix_advance_to_next_stmt #if 0 for (;;) { Token t = f->cursor[0]; switch (t.kind) { case Token_EOF: return; case Token_type: case Token_break: case Token_continue: case Token_fallthrough: case Token_if: case Token_for: case Token_defer: case Token_return: if (token_pos_are_equal(t.pos, f->fix_prev_pos) && f->fix_count < PARSER_MAX_FIX_COUNT) { f->fix_count++; return; } if (token_pos_cmp(f->fix_prev_pos, t.pos) < 0) { f->fix_prev_pos = t.pos; f->fix_count = 0; // NOTE(bill): Reset return; } } next_token(f); } #endif } b32 expect_semicolon_after_stmt(AstFile *f, AstNode *s) { // if (s != NULL) { // switch (s->kind) { // case AstNode_ProcDecl: // return true; // case AstNode_TypeDecl: { // switch (s->TypeDecl.type->kind) { // case AstNode_StructType: // case AstNode_UnionType: // case AstNode_EnumType: // case AstNode_ProcType: // return true; // } // } break; // } // } if (!allow_token(f, Token_Semicolon)) { if (f->cursor[0].pos.line == f->cursor[-1].pos.line) { if (f->cursor[0].kind != Token_CloseBrace) { // CLEANUP(bill): Semicolon handling in parser ast_file_err(f, f->cursor[0], "Expected `;` after %.*s, got `%.*s`", LIT(ast_node_strings[s->kind]), LIT(token_strings[f->cursor[0].kind])); return false; } } } return true; } AstNode * parse_expr(AstFile *f, b32 lhs); AstNode * parse_proc_type(AstFile *f); AstNodeArray parse_stmt_list(AstFile *f); AstNode * parse_stmt(AstFile *f); AstNode * parse_body(AstFile *f); AstNode *parse_identifier(AstFile *f) { Token token = f->cursor[0]; if (token.kind == Token_Identifier) { next_token(f); } else { token.string = make_string("_"); expect_token(f, Token_Identifier); } return make_ident(f, token); } AstNode *parse_tag_expr(AstFile *f, AstNode *expression) { Token token = expect_token(f, Token_Hash); Token name = expect_token(f, Token_Identifier); return make_tag_expr(f, token, name, expression); } AstNode *parse_tag_stmt(AstFile *f, AstNode *statement) { Token token = expect_token(f, Token_Hash); Token name = expect_token(f, Token_Identifier); return make_tag_stmt(f, token, name, statement); } AstNode *unparen_expr(AstNode *node) { for (;;) { if (node->kind != AstNode_ParenExpr) return node; node = node->ParenExpr.expr; } } AstNode *parse_value(AstFile *f); AstNodeArray parse_element_list(AstFile *f) { AstNodeArray elems = make_ast_node_array(f); while (f->cursor[0].kind != Token_CloseBrace && f->cursor[0].kind != Token_EOF) { AstNode *elem = parse_value(f); if (f->cursor[0].kind == Token_Eq) { Token eq = expect_token(f, Token_Eq); AstNode *value = parse_value(f); elem = make_field_value(f, elem, value, eq); } gb_array_append(elems, elem); if (f->cursor[0].kind != Token_Comma) { break; } next_token(f); } return elems; } AstNode *parse_literal_value(AstFile *f, AstNode *type) { AstNodeArray elems = NULL; Token open = expect_token(f, Token_OpenBrace); f->expr_level++; if (f->cursor[0].kind != Token_CloseBrace) { elems = parse_element_list(f); } f->expr_level--; Token close = expect_token(f, Token_CloseBrace); return make_compound_lit(f, type, elems, open, close); } AstNode *parse_value(AstFile *f) { if (f->cursor[0].kind == Token_OpenBrace) return parse_literal_value(f, NULL); AstNode *value = parse_expr(f, false); return value; } AstNode *parse_identifier_or_type(AstFile *f, u32 flags = 0); void check_proc_add_tag(AstFile *f, AstNode *tag_expr, u64 *tags, ProcTag tag, String tag_name) { if (*tags & tag) { ast_file_err(f, ast_node_token(tag_expr), "Procedure tag already used: %.*s", LIT(tag_name)); } *tags |= tag; } b32 is_foreign_name_valid(String name) { // TODO(bill): is_foreign_name_valid if (name.len == 0) return false; isize offset = 0; while (offset < name.len) { Rune rune; isize remaining = name.len - offset; isize width = gb_utf8_decode(name.text+offset, remaining, &rune); if (rune == GB_RUNE_INVALID && width == 1) { return false; } else if (rune == GB_RUNE_BOM && remaining > 0) { return false; } if (offset == 0) { switch (rune) { case '-': case '$': case '.': case '_': break; default: if (!gb_char_is_alpha(cast(char)rune)) return false; break; } } else { switch (rune) { case '-': case '$': case '.': case '_': break; default: if (!gb_char_is_alphanumeric(cast(char)rune)) { return false; } break; } } offset += width; } return true; } void parse_proc_tags(AstFile *f, u64 *tags, String *foreign_name) { // TODO(bill): Add this to procedure literals too while (f->cursor[0].kind == Token_Hash) { AstNode *tag_expr = parse_tag_expr(f, NULL); ast_node(te, TagExpr, tag_expr); String tag_name = te->name.string; if (are_strings_equal(tag_name, make_string("foreign"))) { check_proc_add_tag(f, tag_expr, tags, ProcTag_foreign, tag_name); if (f->cursor[0].kind == Token_String) { *foreign_name = f->cursor[0].string; // TODO(bill): Check if valid string if (!is_foreign_name_valid(*foreign_name)) { ast_file_err(f, ast_node_token(tag_expr), "Invalid alternative foreign procedure name"); } next_token(f); } } else if (are_strings_equal(tag_name, make_string("bounds_check"))) { check_proc_add_tag(f, tag_expr, tags, ProcTag_bounds_check, tag_name); } else if (are_strings_equal(tag_name, make_string("no_bounds_check"))) { check_proc_add_tag(f, tag_expr, tags, ProcTag_no_bounds_check, tag_name); } else if (are_strings_equal(tag_name, make_string("inline"))) { check_proc_add_tag(f, tag_expr, tags, ProcTag_inline, tag_name); } else if (are_strings_equal(tag_name, make_string("no_inline"))) { check_proc_add_tag(f, tag_expr, tags, ProcTag_no_inline, tag_name); // } else if (are_strings_equal(tag_name, make_string("no_context"))) { // check_proc_add_tag(f, tag_expr, tags, ProcTag_no_context, tag_name); } else { ast_file_err(f, ast_node_token(tag_expr), "Unknown procedure tag"); } } if ((*tags & ProcTag_inline) && (*tags & ProcTag_no_inline)) { ast_file_err(f, f->cursor[0], "You cannot apply both #inline and #no_inline to a procedure"); } if ((*tags & ProcTag_bounds_check) && (*tags & ProcTag_no_bounds_check)) { ast_file_err(f, f->cursor[0], "You cannot apply both #bounds_check and #no_bounds_check to a procedure"); } if (((*tags & ProcTag_bounds_check) || (*tags & ProcTag_no_bounds_check)) && (*tags & ProcTag_foreign)) { ast_file_err(f, f->cursor[0], "You cannot apply both #bounds_check or #no_bounds_check to a procedure without a body"); } } AstNode *parse_operand(AstFile *f, b32 lhs) { AstNode *operand = NULL; // Operand switch (f->cursor[0].kind) { case Token_Identifier: operand = parse_identifier(f); if (!lhs) { // TODO(bill): Handle? } return operand; case Token_Integer: case Token_Float: case Token_String: case Token_Rune: operand = make_basic_lit(f, f->cursor[0]); next_token(f); return operand; case Token_OpenParen: { Token open, close; // NOTE(bill): Skip the Paren Expression open = expect_token(f, Token_OpenParen); f->expr_level++; operand = parse_expr(f, false); f->expr_level--; close = expect_token(f, Token_CloseParen); return make_paren_expr(f, operand, open, close); } case Token_Hash: { operand = parse_tag_expr(f, NULL); String name = operand->TagExpr.name.string; if (are_strings_equal(name, make_string("rune"))) { if (f->cursor[0].kind == Token_String) { Token *s = &f->cursor[0]; if (gb_utf8_strnlen(s->string.text, s->string.len) != 1) { ast_file_err(f, *s, "Invalid rune literal %.*s", LIT(s->string)); } s->kind = Token_Rune; // NOTE(bill): Change it } else { expect_token(f, Token_String); } operand = parse_operand(f, lhs); } else { operand->TagExpr.expr = parse_expr(f, false); } return operand; } // Parse Procedure Type or Literal case Token_proc: { AstNode *curr_proc = f->curr_proc; AstNode *type = parse_proc_type(f); f->curr_proc = type; defer (f->curr_proc = curr_proc); u64 tags = 0; String foreign_name = {}; parse_proc_tags(f, &tags, &foreign_name); if (tags & ProcTag_foreign) { ast_file_err(f, f->cursor[0], "#foreign cannot be applied to procedure literals"); } if (f->cursor[0].kind != Token_OpenBrace) { return type; } else { AstNode *body; f->expr_level++; body = parse_body(f); f->expr_level--; return make_proc_lit(f, type, body, tags); } } default: { AstNode *type = parse_identifier_or_type(f); if (type != NULL) { // NOTE(bill): Sanity check as identifiers should be handled already GB_ASSERT_MSG(type->kind != AstNode_Ident, "Type Cannot be identifier"); return type; } } } Token begin = f->cursor[0]; ast_file_err(f, begin, "Expected an operand"); fix_advance_to_next_stmt(f); return make_bad_expr(f, begin, f->cursor[0]); } b32 is_literal_type(AstNode *node) { switch (node->kind) { case AstNode_BadExpr: case AstNode_Ident: case AstNode_SelectorExpr: case AstNode_ArrayType: case AstNode_VectorType: case AstNode_StructType: return true; } return false; } AstNode *parse_call_expr(AstFile *f, AstNode *operand) { AstNodeArray args = make_ast_node_array(f); Token open_paren, close_paren; Token ellipsis = {}; f->expr_level++; open_paren = expect_token(f, Token_OpenParen); while (f->cursor[0].kind != Token_CloseParen && f->cursor[0].kind != Token_EOF && ellipsis.pos.line == 0) { if (f->cursor[0].kind == Token_Comma) ast_file_err(f, f->cursor[0], "Expected an expression not a ,"); if (f->cursor[0].kind == Token_Ellipsis) { ellipsis = f->cursor[0]; next_token(f); } gb_array_append(args, parse_expr(f, false)); if (f->cursor[0].kind != Token_Comma) { if (f->cursor[0].kind == Token_CloseParen) break; } next_token(f); } f->expr_level--; close_paren = expect_token(f, Token_CloseParen); return make_call_expr(f, operand, args, open_paren, close_paren, ellipsis); } AstNode *parse_atom_expr(AstFile *f, b32 lhs) { AstNode *operand = parse_operand(f, lhs); b32 loop = true; while (loop) { switch (f->cursor[0].kind) { case Token_Prime: { Token op = expect_token(f, Token_Prime); if (lhs) { // TODO(bill): Handle this } AstNode *proc = parse_identifier(f); gbArray(AstNode *) args; gb_array_init_reserve(args, gb_arena_allocator(&f->arena), 1); gb_array_append(args, operand); operand = make_call_expr(f, proc, args, ast_node_token(operand), op, empty_token); } break; case Token_OpenParen: { if (lhs) { // TODO(bill): Handle this shit! Is this even allowed in this language?! } operand = parse_call_expr(f, operand); } break; case Token_Period: { Token token = f->cursor[0]; next_token(f); if (lhs) { // TODO(bill): handle this } switch (f->cursor[0].kind) { case Token_Identifier: operand = make_selector_expr(f, token, operand, parse_identifier(f)); break; default: { ast_file_err(f, f->cursor[0], "Expected a selector"); next_token(f); operand = make_selector_expr(f, f->cursor[0], operand, NULL); } break; } } break; case Token_OpenBracket: { if (lhs) { // TODO(bill): Handle this } Token open, close; AstNode *indices[3] = {}; f->expr_level++; open = expect_token(f, Token_OpenBracket); if (f->cursor[0].kind != Token_Colon) indices[0] = parse_expr(f, false); isize colon_count = 0; Token colons[2] = {}; while (f->cursor[0].kind == Token_Colon && colon_count < 2) { colons[colon_count++] = f->cursor[0]; next_token(f); if (f->cursor[0].kind != Token_Colon && f->cursor[0].kind != Token_CloseBracket && f->cursor[0].kind != Token_EOF) { indices[colon_count] = parse_expr(f, false); } } f->expr_level--; close = expect_token(f, Token_CloseBracket); if (colon_count == 0) { operand = make_index_expr(f, operand, indices[0], open, close); } else { b32 triple_indexed = false; if (colon_count == 2) { triple_indexed = true; if (indices[1] == NULL) { ast_file_err(f, colons[0], "Second index is required in a triple indexed slice"); indices[1] = make_bad_expr(f, colons[0], colons[1]); } if (indices[2] == NULL) { ast_file_err(f, colons[1], "Third index is required in a triple indexed slice"); indices[2] = make_bad_expr(f, colons[1], close); } } operand = make_slice_expr(f, operand, open, close, indices[0], indices[1], indices[2], triple_indexed); } } break; case Token_Pointer: // Deference operand = make_deref_expr(f, operand, expect_token(f, Token_Pointer)); break; case Token_OpenBrace: { if (!lhs && is_literal_type(operand) && f->expr_level >= 0) { operand = parse_literal_value(f, operand); } else { loop = false; } } break; default: loop = false; break; } lhs = false; // NOTE(bill): 'tis not lhs anymore } return operand; } AstNode *parse_type(AstFile *f); AstNode *parse_unary_expr(AstFile *f, b32 lhs) { switch (f->cursor[0].kind) { case Token_Pointer: case Token_Add: case Token_Sub: case Token_Not: case Token_Xor: { AstNode *operand; Token op = f->cursor[0]; next_token(f); operand = parse_unary_expr(f, lhs); return make_unary_expr(f, op, operand); } break; } return parse_atom_expr(f, lhs); } AstNode *parse_binary_expr(AstFile *f, b32 lhs, i32 prec_in) { AstNode *expression = parse_unary_expr(f, lhs); for (i32 prec = token_precedence(f->cursor[0]); prec >= prec_in; prec--) { for (;;) { AstNode *right; Token op = f->cursor[0]; i32 op_prec = token_precedence(op); if (op_prec != prec) break; expect_operator(f); // NOTE(bill): error checks too if (lhs) { // TODO(bill): error checking lhs = false; } switch (op.kind) { case Token_DoublePrime: { AstNode *proc = parse_identifier(f); AstNode *right = parse_binary_expr(f, false, prec+1); gbArray(AstNode *) args; gb_array_init_reserve(args, gb_arena_allocator(&f->arena), 2); gb_array_append(args, expression); gb_array_append(args, right); expression = make_call_expr(f, proc, args, op, ast_node_token(right), empty_token); continue; } break; case Token_as: case Token_transmute: case Token_down_cast: right = parse_type(f); break; default: right = parse_binary_expr(f, false, prec+1); if (!right) { ast_file_err(f, op, "Expected expression on the right hand side of the binary operator"); } break; } expression = make_binary_expr(f, op, expression, right); } } return expression; } AstNode *parse_expr(AstFile *f, b32 lhs) { return parse_binary_expr(f, lhs, 0+1); } AstNodeArray parse_expr_list(AstFile *f, b32 lhs) { AstNodeArray list = make_ast_node_array(f); do { AstNode *e = parse_expr(f, lhs); gb_array_append(list, e); if (f->cursor[0].kind != Token_Comma || f->cursor[0].kind == Token_EOF) { break; } next_token(f); } while (true); return list; } AstNodeArray parse_lhs_expr_list(AstFile *f) { return parse_expr_list(f, true); } AstNodeArray parse_rhs_expr_list(AstFile *f) { return parse_expr_list(f, false); } AstNode *parse_decl(AstFile *f, AstNodeArray names); AstNode *parse_simple_stmt(AstFile *f) { isize lhs_count = 0, rhs_count = 0; AstNodeArray lhs = parse_lhs_expr_list(f); AstNode *statement = NULL; Token token = f->cursor[0]; switch (token.kind) { case Token_Eq: case Token_AddEq: case Token_SubEq: case Token_MulEq: case Token_QuoEq: case Token_ModEq: case Token_AndEq: case Token_OrEq: case Token_XorEq: case Token_ShlEq: case Token_ShrEq: case Token_AndNotEq: case Token_CmpAndEq: case Token_CmpOrEq: { if (f->curr_proc == NULL) { ast_file_err(f, f->cursor[0], "You cannot use a simple statement in the file scope"); return make_bad_stmt(f, f->cursor[0], f->cursor[0]); } next_token(f); AstNodeArray rhs = parse_rhs_expr_list(f); if (gb_array_count(rhs) == 0) { ast_file_err(f, token, "No right-hand side in assignment statement."); return make_bad_stmt(f, token, f->cursor[0]); } return make_assign_stmt(f, token, lhs, rhs); } break; case Token_Colon: // Declare return parse_decl(f, lhs); } if (lhs_count > 1) { ast_file_err(f, token, "Expected 1 expression"); return make_bad_stmt(f, token, f->cursor[0]); } token = f->cursor[0]; switch (token.kind) { case Token_Increment: case Token_Decrement: if (f->curr_proc == NULL) { ast_file_err(f, f->cursor[0], "You cannot use a simple statement in the file scope"); return make_bad_stmt(f, f->cursor[0], f->cursor[0]); } statement = make_inc_dec_stmt(f, token, lhs[0]); next_token(f); return statement; } return make_expr_stmt(f, lhs[0]); } AstNode *parse_block_stmt(AstFile *f) { if (f->curr_proc == NULL) { ast_file_err(f, f->cursor[0], "You cannot use a block statement in the file scope"); return make_bad_stmt(f, f->cursor[0], f->cursor[0]); } AstNode *block_stmt = parse_body(f); return block_stmt; } AstNode *convert_stmt_to_expr(AstFile *f, AstNode *statement, String kind) { if (statement == NULL) return NULL; if (statement->kind == AstNode_ExprStmt) return statement->ExprStmt.expr; ast_file_err(f, f->cursor[0], "Expected `%.*s`, found a simple statement.", LIT(kind)); return make_bad_expr(f, f->cursor[0], f->cursor[1]); } AstNodeArray parse_identfier_list(AstFile *f) { AstNodeArray list = make_ast_node_array(f); do { gb_array_append(list, parse_identifier(f)); if (f->cursor[0].kind != Token_Comma || f->cursor[0].kind == Token_EOF) { break; } next_token(f); } while (true); return list; } AstNode *parse_type_attempt(AstFile *f) { AstNode *type = parse_identifier_or_type(f); if (type != NULL) { // TODO(bill): Handle? } return type; } AstNode *parse_type(AstFile *f) { AstNode *type = parse_type_attempt(f); if (type == NULL) { Token token = f->cursor[0]; ast_file_err(f, token, "Expected a type"); next_token(f); return make_bad_expr(f, token, f->cursor[0]); } return type; } Token parse_procedure_signature(AstFile *f, AstNodeArray *params, AstNodeArray *results); AstNode *parse_proc_type(AstFile *f) { AstNodeArray params = NULL; AstNodeArray results = NULL; Token proc_token = parse_procedure_signature(f, ¶ms, &results); return make_proc_type(f, proc_token, params, results); } AstNode *parse_field_decl(AstFile *f) { b32 is_using = false; if (allow_token(f, Token_using)) { is_using = true; } AstNodeArray names = parse_lhs_expr_list(f); if (gb_array_count(names) == 0) { ast_file_err(f, f->cursor[0], "Empty field declaration"); } if (gb_array_count(names) > 1 && is_using) { ast_file_err(f, f->cursor[0], "Cannot apply `using` to more than one of the same type"); is_using = false; } expect_token(f, Token_Colon); AstNode *type = NULL; if (f->cursor[0].kind == Token_Ellipsis) { Token ellipsis = f->cursor[0]; next_token(f); type = parse_type_attempt(f); if (type == NULL) { ast_file_err(f, f->cursor[0], "variadic parameter is missing a type after `..`"); type = make_bad_expr(f, ellipsis, f->cursor[0]); } else { if (gb_array_count(names) > 1) { ast_file_err(f, f->cursor[0], "mutliple variadic parameters, only `..`"); } else { type = make_ellipsis(f, ellipsis, type); } } } else { type = parse_type_attempt(f); } if (type == NULL) { ast_file_err(f, f->cursor[0], "Expected a type for this field declaration"); } AstNode *field = make_field(f, names, type, is_using); return field; } AstNodeArray parse_parameter_list(AstFile *f) { AstNodeArray params = make_ast_node_array(f); while (f->cursor[0].kind == Token_Identifier || f->cursor[0].kind == Token_using) { AstNode *field = parse_field_decl(f); gb_array_append(params, field); if (f->cursor[0].kind != Token_Comma) { break; } next_token(f); } return params; } AstNodeArray parse_struct_params(AstFile *f, isize *decl_count_, b32 using_allowed) { AstNodeArray decls = make_ast_node_array(f); isize decl_count = 0; while (f->cursor[0].kind == Token_Identifier || f->cursor[0].kind == Token_using) { b32 is_using = false; if (allow_token(f, Token_using)) { is_using = true; } AstNodeArray names = parse_lhs_expr_list(f); if (gb_array_count(names) == 0) { ast_file_err(f, f->cursor[0], "Empty field declaration"); } if (!using_allowed && is_using) { ast_file_err(f, f->cursor[0], "Cannot apply `using` to members of a union"); is_using = false; } if (gb_array_count(names) > 1 && is_using) { ast_file_err(f, f->cursor[0], "Cannot apply `using` to more than one of the same type"); } AstNode *decl = NULL; if (f->cursor[0].kind == Token_Colon) { decl = parse_decl(f, names); if (decl->kind == AstNode_ProcDecl) { ast_file_err(f, f->cursor[0], "Procedure declarations are not allowed within a structure"); decl = make_bad_decl(f, ast_node_token(names[0]), f->cursor[0]); } } else { ast_file_err(f, f->cursor[0], "Illegal structure field"); decl = make_bad_decl(f, ast_node_token(names[0]), f->cursor[0]); } expect_semicolon_after_stmt(f, decl); if (decl != NULL && is_ast_node_decl(decl)) { gb_array_append(decls, decl); if (decl->kind == AstNode_VarDecl) { decl->VarDecl.is_using = is_using && using_allowed; if (decl->VarDecl.kind == Declaration_Mutable) { if (gb_array_count(decl->VarDecl.values) > 0) { ast_file_err(f, f->cursor[0], "Default variable assignments within a structure will be ignored (at the moment)"); } } } else { decl_count += 1; } } } if (decl_count_) *decl_count_ = decl_count; return decls; } AstNode *parse_identifier_or_type(AstFile *f, u32 flags) { switch (f->cursor[0].kind) { case Token_volatile: next_token(f); return parse_identifier_or_type(f, flags | TypeFlag_volatile); case Token_atomic: next_token(f); return parse_identifier_or_type(f, flags | TypeFlag_atomic); case Token_Identifier: { AstNode *e = parse_identifier(f); while (f->cursor[0].kind == Token_Period) { Token token = f->cursor[0]; next_token(f); AstNode *sel = parse_identifier(f); e = make_selector_expr(f, token, e, sel); } if (f->cursor[0].kind == Token_OpenParen) { // HACK NOTE(bill): For type_of_val(expr) e = parse_call_expr(f, e); } e->type_flags = flags; return e; } case Token_Pointer: { AstNode *e = make_pointer_type(f, expect_token(f, Token_Pointer), parse_type(f)); e->type_flags = flags; return e; } case Token_OpenBracket: { f->expr_level++; Token token = expect_token(f, Token_OpenBracket); AstNode *count_expr = NULL; if (f->cursor[0].kind == Token_Ellipsis) { count_expr = make_ellipsis(f, f->cursor[0], NULL); next_token(f); } else if (f->cursor[0].kind != Token_CloseBracket) { count_expr = parse_expr(f, false); } expect_token(f, Token_CloseBracket); f->expr_level--; AstNode *e = make_array_type(f, token, count_expr, parse_type(f)); e->type_flags = flags; return e; } case Token_OpenBrace: { f->expr_level++; Token token = expect_token(f, Token_OpenBrace); AstNode *count_expr = parse_expr(f, false); expect_token(f, Token_CloseBrace); f->expr_level--; AstNode *e = make_vector_type(f, token, count_expr, parse_type(f)); e->type_flags = flags; return e; } case Token_struct: { Token token = expect_token(f, Token_struct); b32 is_packed = false; b32 is_ordered = false; while (allow_token(f, Token_Hash)) { Token tag = expect_token(f, Token_Identifier); if (are_strings_equal(tag.string, make_string("packed"))) { is_packed = true; } else if (are_strings_equal(tag.string, make_string("ordered"))) { is_ordered = true; } else { ast_file_err(f, tag, "Expected a `#packed` or `#ordered` tag"); } } if (is_packed && is_ordered) { ast_file_err(f, token, "`#ordered` is not needed with `#packed` which implies ordering"); } Token open = expect_token(f, Token_OpenBrace); isize decl_count = 0; AstNodeArray decls = parse_struct_params(f, &decl_count, true); Token close = expect_token(f, Token_CloseBrace); AstNode *e = make_struct_type(f, token, decls, decl_count, is_packed, is_ordered); e->type_flags = flags; return e; } break; case Token_union: { Token token = expect_token(f, Token_union); Token open = expect_token(f, Token_OpenBrace); isize decl_count = 0; AstNodeArray decls = parse_struct_params(f, &decl_count, false); Token close = expect_token(f, Token_CloseBrace); AstNode *e = make_union_type(f, token, decls, decl_count); e->type_flags = flags; return e; } case Token_raw_union: { Token token = expect_token(f, Token_raw_union); Token open = expect_token(f, Token_OpenBrace); isize decl_count = 0; AstNodeArray decls = parse_struct_params(f, &decl_count, true); Token close = expect_token(f, Token_CloseBrace); AstNode *e = make_raw_union_type(f, token, decls, decl_count); e->type_flags = flags; return e; } case Token_enum: { Token token = expect_token(f, Token_enum); AstNode *base_type = NULL; Token open, close; if (f->cursor[0].kind != Token_OpenBrace) { base_type = parse_type(f); } AstNodeArray fields = make_ast_node_array(f); open = expect_token(f, Token_OpenBrace); while (f->cursor[0].kind != Token_CloseBrace && f->cursor[0].kind != Token_EOF) { AstNode *name = parse_identifier(f); AstNode *value = NULL; Token eq = empty_token; if (f->cursor[0].kind == Token_Eq) { eq = expect_token(f, Token_Eq); value = parse_value(f); } AstNode *field = make_field_value(f, name, value, eq); gb_array_append(fields, field); if (f->cursor[0].kind != Token_Comma) { break; } next_token(f); } close = expect_token(f, Token_CloseBrace); AstNode *e = make_enum_type(f, token, base_type, fields); e->type_flags = flags; return e; } case Token_proc: { AstNode *curr_proc = f->curr_proc; AstNode *type = parse_proc_type(f); f->curr_proc = type; f->curr_proc = curr_proc; return type; } case Token_OpenParen: { // NOTE(bill): Skip the paren expression AstNode *type; Token open, close; open = expect_token(f, Token_OpenParen); type = parse_type(f); close = expect_token(f, Token_CloseParen); AstNode *e = make_paren_expr(f, type, open, close); e->type_flags = flags; return e; } // TODO(bill): Why is this even allowed? Is this a parsing error? case Token_Colon: break; case Token_Eq: if (f->cursor[-1].kind == Token_Colon) break; // fallthrough default: ast_file_err(f, f->cursor[0], "Expected a type after `%.*s`, got `%.*s`", LIT(f->cursor[-1].string), LIT(f->cursor[0].string)); break; } return NULL; } AstNodeArray parse_results(AstFile *f) { AstNodeArray results = make_ast_node_array(f); if (allow_token(f, Token_ArrowRight)) { if (f->cursor[0].kind == Token_OpenParen) { expect_token(f, Token_OpenParen); while (f->cursor[0].kind != Token_CloseParen && f->cursor[0].kind != Token_EOF) { gb_array_append(results, parse_type(f)); if (f->cursor[0].kind != Token_Comma) { break; } next_token(f); } expect_token(f, Token_CloseParen); return results; } gb_array_append(results, parse_type(f)); return results; } return results; } Token parse_procedure_signature(AstFile *f, AstNodeArray *params, AstNodeArray *results) { Token proc_token = expect_token(f, Token_proc); expect_token(f, Token_OpenParen); *params = parse_parameter_list(f); expect_token(f, Token_CloseParen); *results = parse_results(f); return proc_token; } AstNode *parse_body(AstFile *f) { AstNodeArray stmts = NULL; Token open, close; open = expect_token(f, Token_OpenBrace); stmts = parse_stmt_list(f); close = expect_token(f, Token_CloseBrace); return make_block_stmt(f, stmts, open, close); } AstNode *parse_proc_decl(AstFile *f, Token proc_token, AstNode *name) { AstNodeArray params = NULL; AstNodeArray results = NULL; parse_procedure_signature(f, ¶ms, &results); AstNode *proc_type = make_proc_type(f, proc_token, params, results); AstNode *body = NULL; u64 tags = 0; String foreign_name = {}; parse_proc_tags(f, &tags, &foreign_name); AstNode *curr_proc = f->curr_proc; f->curr_proc = proc_type; defer (f->curr_proc = curr_proc); if (f->cursor[0].kind == Token_OpenBrace) { if ((tags & ProcTag_foreign) != 0) { ast_file_err(f, f->cursor[0], "A procedure tagged as `#foreign` cannot have a body"); } body = parse_body(f); } return make_proc_decl(f, name, proc_type, body, tags, foreign_name); } AstNode *parse_decl(AstFile *f, AstNodeArray names) { AstNodeArray values = NULL; AstNode *type = NULL; gb_for_array(i, names) { AstNode *name = names[i]; if (name->kind == AstNode_Ident) { String n = name->Ident.string; // NOTE(bill): Check for reserved identifiers if (are_strings_equal(n, make_string("context"))) { ast_file_err(f, ast_node_token(name), "`context` is a reserved identifier"); break; } } } if (allow_token(f, Token_Colon)) { if (!allow_token(f, Token_type)) { type = parse_identifier_or_type(f); } } else if (f->cursor[0].kind != Token_Eq && f->cursor[0].kind != Token_Semicolon) { ast_file_err(f, f->cursor[0], "Expected type separator `:` or `=`"); } DeclKind declaration_kind = Declaration_Mutable; if (f->cursor[0].kind == Token_Eq || f->cursor[0].kind == Token_Colon) { if (f->cursor[0].kind == Token_Colon) declaration_kind = Declaration_Immutable; next_token(f); if (f->cursor[0].kind == Token_type || f->cursor[0].kind == Token_struct || f->cursor[0].kind == Token_enum || f->cursor[0].kind == Token_union || f->cursor[0].kind == Token_raw_union) { Token token = f->cursor[0]; if (token.kind == Token_type) { next_token(f); } if (gb_array_count(names) != 1) { ast_file_err(f, ast_node_token(names[0]), "You can only declare one type at a time"); return make_bad_decl(f, names[0]->Ident, token); } if (type != NULL) { ast_file_err(f, f->cursor[-1], "Expected either `type` or nothing between : and :"); // NOTE(bill): Do not fail though } AstNode *type = parse_type(f); return make_type_decl(f, token, names[0], type); } else if (f->cursor[0].kind == Token_proc && declaration_kind == Declaration_Immutable) { // NOTE(bill): Procedure declarations Token proc_token = f->cursor[0]; AstNode *name = names[0]; if (gb_array_count(names) != 1) { ast_file_err(f, proc_token, "You can only declare one procedure at a time"); return make_bad_decl(f, name->Ident, proc_token); } AstNode *proc_decl = parse_proc_decl(f, proc_token, name); return proc_decl; } else { values = parse_rhs_expr_list(f); if (gb_array_count(values) > gb_array_count(names)) { ast_file_err(f, f->cursor[0], "Too many values on the right hand side of the declaration"); } else if (gb_array_count(values) < gb_array_count(names) && declaration_kind == Declaration_Immutable) { ast_file_err(f, f->cursor[0], "All constant declarations must be defined"); } else if (gb_array_count(values) == 0) { ast_file_err(f, f->cursor[0], "Expected an expression for this declaration"); } } } if (declaration_kind == Declaration_Mutable) { if (type == NULL && gb_array_count(values) == 0) { ast_file_err(f, f->cursor[0], "Missing variable type or initialization"); return make_bad_decl(f, f->cursor[0], f->cursor[0]); } } else if (declaration_kind == Declaration_Immutable) { if (type == NULL && gb_array_count(values) == 0 && gb_array_count(names) > 0) { ast_file_err(f, f->cursor[0], "Missing constant value"); return make_bad_decl(f, f->cursor[0], f->cursor[0]); } } else { Token begin = f->cursor[0]; ast_file_err(f, begin, "Unknown type of variable declaration"); fix_advance_to_next_stmt(f); return make_bad_decl(f, begin, f->cursor[0]); } if (values == NULL) { values = make_ast_node_array(f); } return make_var_decl(f, declaration_kind, names, type, values); } AstNode *parse_if_stmt(AstFile *f) { if (f->curr_proc == NULL) { ast_file_err(f, f->cursor[0], "You cannot use an if statement in the file scope"); return make_bad_stmt(f, f->cursor[0], f->cursor[0]); } Token token = expect_token(f, Token_if); AstNode *init = NULL; AstNode *cond = NULL; AstNode *body = NULL; AstNode *else_stmt = NULL; isize prev_level = f->expr_level; f->expr_level = -1; if (allow_token(f, Token_Semicolon)) { cond = parse_expr(f, false); } else { init = parse_simple_stmt(f); if (allow_token(f, Token_Semicolon)) { cond = parse_expr(f, false); } else { cond = convert_stmt_to_expr(f, init, make_string("boolean expression")); init = NULL; } } f->expr_level = prev_level; if (cond == NULL) { ast_file_err(f, f->cursor[0], "Expected condition for if statement"); } body = parse_block_stmt(f); if (allow_token(f, Token_else)) { switch (f->cursor[0].kind) { case Token_if: else_stmt = parse_if_stmt(f); break; case Token_OpenBrace: else_stmt = parse_block_stmt(f); break; default: ast_file_err(f, f->cursor[0], "Expected if statement block statement"); else_stmt = make_bad_stmt(f, f->cursor[0], f->cursor[1]); break; } } return make_if_stmt(f, token, init, cond, body, else_stmt); } AstNode *parse_return_stmt(AstFile *f) { if (f->curr_proc == NULL) { ast_file_err(f, f->cursor[0], "You cannot use a return statement in the file scope"); return make_bad_stmt(f, f->cursor[0], f->cursor[0]); } Token token = expect_token(f, Token_return); AstNodeArray results = make_ast_node_array(f); if (f->cursor[0].kind != Token_Semicolon && f->cursor[0].kind != Token_CloseBrace && f->cursor[0].pos.line == token.pos.line) { results = parse_rhs_expr_list(f); } if (f->cursor[0].kind != Token_CloseBrace) { expect_semicolon_after_stmt(f, results ? results[0] : NULL); } return make_return_stmt(f, token, results); } AstNode *parse_for_stmt(AstFile *f) { if (f->curr_proc == NULL) { ast_file_err(f, f->cursor[0], "You cannot use a for statement in the file scope"); return make_bad_stmt(f, f->cursor[0], f->cursor[0]); } Token token = expect_token(f, Token_for); AstNode *init = NULL; AstNode *cond = NULL; AstNode *end = NULL; AstNode *body = NULL; if (f->cursor[0].kind != Token_OpenBrace) { isize prev_level = f->expr_level; f->expr_level = -1; if (f->cursor[0].kind != Token_Semicolon) { cond = parse_simple_stmt(f); if (is_ast_node_complex_stmt(cond)) { ast_file_err(f, f->cursor[0], "You are not allowed that type of statement in a for statement, it is too complex!"); } } if (allow_token(f, Token_Semicolon)) { init = cond; cond = NULL; if (f->cursor[0].kind != Token_Semicolon) { cond = parse_simple_stmt(f); } expect_token(f, Token_Semicolon); if (f->cursor[0].kind != Token_OpenBrace) { end = parse_simple_stmt(f); } } f->expr_level = prev_level; } body = parse_block_stmt(f); cond = convert_stmt_to_expr(f, cond, make_string("boolean expression")); return make_for_stmt(f, token, init, cond, end, body); } AstNode *parse_case_clause(AstFile *f) { Token token = f->cursor[0]; AstNodeArray list = make_ast_node_array(f); if (allow_token(f, Token_case)) { list = parse_rhs_expr_list(f); } else { expect_token(f, Token_default); } expect_token(f, Token_Colon); // TODO(bill): Is this the best syntax? AstNodeArray stmts = parse_stmt_list(f); return make_case_clause(f, token, list, stmts); } AstNode *parse_type_case_clause(AstFile *f) { Token token = f->cursor[0]; AstNodeArray clause = make_ast_node_array(f); if (allow_token(f, Token_case)) { gb_array_append(clause, parse_expr(f, false)); } else { expect_token(f, Token_default); } expect_token(f, Token_Colon); // TODO(bill): Is this the best syntax? AstNodeArray stmts = parse_stmt_list(f); return make_case_clause(f, token, clause, stmts); } AstNode *parse_match_stmt(AstFile *f) { if (f->curr_proc == NULL) { ast_file_err(f, f->cursor[0], "You cannot use a match statement in the file scope"); return make_bad_stmt(f, f->cursor[0], f->cursor[0]); } Token token = expect_token(f, Token_match); AstNode *init = NULL; AstNode *tag = NULL; AstNode *body = NULL; Token open, close; if (allow_token(f, Token_type)) { isize prev_level = f->expr_level; f->expr_level = -1; AstNode *var = parse_identifier(f); expect_token(f, Token_Colon); tag = parse_simple_stmt(f); f->expr_level = prev_level; open = expect_token(f, Token_OpenBrace); AstNodeArray list = make_ast_node_array(f); while (f->cursor[0].kind == Token_case || f->cursor[0].kind == Token_default) { gb_array_append(list, parse_type_case_clause(f)); } close = expect_token(f, Token_CloseBrace); body = make_block_stmt(f, list, open, close); tag = convert_stmt_to_expr(f, tag, make_string("type match expression")); return make_type_match_stmt(f, token, tag, var, body); } else { if (f->cursor[0].kind != Token_OpenBrace) { isize prev_level = f->expr_level; f->expr_level = -1; if (f->cursor[0].kind != Token_Semicolon) { tag = parse_simple_stmt(f); } if (allow_token(f, Token_Semicolon)) { init = tag; tag = NULL; if (f->cursor[0].kind != Token_OpenBrace) { tag = parse_simple_stmt(f); } } f->expr_level = prev_level; } open = expect_token(f, Token_OpenBrace); AstNodeArray list = make_ast_node_array(f); while (f->cursor[0].kind == Token_case || f->cursor[0].kind == Token_default) { gb_array_append(list, parse_case_clause(f)); } close = expect_token(f, Token_CloseBrace); body = make_block_stmt(f, list, open, close); tag = convert_stmt_to_expr(f, tag, make_string("match expression")); return make_match_stmt(f, token, init, tag, body); } } AstNode *parse_defer_stmt(AstFile *f) { if (f->curr_proc == NULL) { ast_file_err(f, f->cursor[0], "You cannot use a defer statement in the file scope"); return make_bad_stmt(f, f->cursor[0], f->cursor[0]); } Token token = expect_token(f, Token_defer); AstNode *statement = parse_stmt(f); switch (statement->kind) { case AstNode_EmptyStmt: ast_file_err(f, token, "Empty statement after defer (e.g. `;`)"); break; case AstNode_DeferStmt: ast_file_err(f, token, "You cannot defer a defer statement"); break; case AstNode_ReturnStmt: ast_file_err(f, token, "You cannot a return statement"); break; } return make_defer_stmt(f, token, statement); } AstNode *parse_asm_stmt(AstFile *f) { Token token = expect_token(f, Token_asm); b32 is_volatile = false; if (allow_token(f, Token_volatile)) { is_volatile = true; } Token open, close, code_string; open = expect_token(f, Token_OpenBrace); code_string = expect_token(f, Token_String); AstNode *output_list = NULL; AstNode *input_list = NULL; AstNode *clobber_list = NULL; isize output_count = 0; isize input_count = 0; isize clobber_count = 0; // TODO(bill): Finish asm statement and determine syntax // if (f->cursor[0].kind != Token_CloseBrace) { // expect_token(f, Token_Colon); // } close = expect_token(f, Token_CloseBrace); return make_asm_stmt(f, token, is_volatile, open, close, code_string, output_list, input_list, clobber_list, output_count, input_count, clobber_count); } AstNode *parse_stmt(AstFile *f) { AstNode *s = NULL; Token token = f->cursor[0]; switch (token.kind) { // Operands case Token_Identifier: case Token_Integer: case Token_Float: case Token_Rune: case Token_String: case Token_OpenParen: case Token_proc: // Unary Operators case Token_Add: case Token_Sub: case Token_Xor: case Token_Not: s = parse_simple_stmt(f); expect_semicolon_after_stmt(f, s); return s; // TODO(bill): other keywords case Token_if: return parse_if_stmt(f); case Token_return: return parse_return_stmt(f); case Token_for: return parse_for_stmt(f); case Token_match: return parse_match_stmt(f); case Token_defer: return parse_defer_stmt(f); case Token_asm: return parse_asm_stmt(f); case Token_break: case Token_continue: case Token_fallthrough: next_token(f); s = make_branch_stmt(f, token); expect_semicolon_after_stmt(f, s); return s; case Token_using: { AstNode *node = NULL; next_token(f); node = parse_stmt(f); b32 valid = false; switch (node->kind) { case AstNode_ExprStmt: { AstNode *e = unparen_expr(node->ExprStmt.expr); while (e->kind == AstNode_SelectorExpr) { e = unparen_expr(e->SelectorExpr.selector); } if (e->kind == AstNode_Ident) { valid = true; } } break; case AstNode_VarDecl: if (node->VarDecl.kind == Declaration_Mutable) { valid = true; } break; } if (!valid) { ast_file_err(f, token, "Illegal use of `using` statement."); return make_bad_stmt(f, token, f->cursor[0]); } return make_using_stmt(f, token, node); } break; case Token_Hash: { s = parse_tag_stmt(f, NULL); String tag = s->TagStmt.name.string; if (are_strings_equal(tag, make_string("global_scope"))) { if (f->curr_proc == NULL) { f->is_global_scope = true; return make_empty_stmt(f, f->cursor[0]); } ast_file_err(f, token, "You cannot use #global_scope within a procedure. This must be done at the file scope."); return make_bad_decl(f, token, f->cursor[0]); } else if (are_strings_equal(tag, make_string("import"))) { // TODO(bill): better error messages Token file_path = expect_token(f, Token_String); Token as = expect_token(f, Token_as); Token import_name = expect_token(f, Token_Identifier); if (f->curr_proc == NULL) { return make_import_decl(f, s->TagStmt.token, file_path, import_name); } ast_file_err(f, token, "You cannot use #import within a procedure. This must be done at the file scope."); return make_bad_decl(f, token, file_path); } else if (are_strings_equal(tag, make_string("foreign_system_library"))) { Token file_path = expect_token(f, Token_String); if (f->curr_proc == NULL) { return make_foreign_system_library(f, s->TagStmt.token, file_path); } ast_file_err(f, token, "You cannot use #foreign_system_library within a procedure. This must be done at the file scope."); return make_bad_decl(f, token, file_path); } else if (are_strings_equal(tag, make_string("thread_local"))) { AstNode *var_decl = parse_simple_stmt(f); if (var_decl->kind != AstNode_VarDecl || var_decl->VarDecl.kind != Declaration_Mutable) { ast_file_err(f, token, "#thread_local may only be applied to variable declarations"); return make_bad_decl(f, token, ast_node_token(var_decl)); } if (f->curr_proc != NULL) { ast_file_err(f, token, "#thread_local is only allowed at the file scope."); return make_bad_decl(f, token, ast_node_token(var_decl)); } var_decl->VarDecl.tags |= VarDeclTag_thread_local; return var_decl; } else if (are_strings_equal(tag, make_string("bounds_check"))) { s = parse_stmt(f); s->stmt_state_flags |= StmtStateFlag_bounds_check; if ((s->stmt_state_flags & StmtStateFlag_no_bounds_check) != 0) { ast_file_err(f, token, "#bounds_check and #no_bounds_check cannot be applied together"); } return s; } else if (are_strings_equal(tag, make_string("no_bounds_check"))) { s = parse_stmt(f); s->stmt_state_flags |= StmtStateFlag_no_bounds_check; if ((s->stmt_state_flags & StmtStateFlag_bounds_check) != 0) { ast_file_err(f, token, "#bounds_check and #no_bounds_check cannot be applied together"); } return s; } s->TagStmt.stmt = parse_stmt(f); // TODO(bill): Find out why this doesn't work as an argument return s; } break; case Token_OpenBrace: return parse_block_stmt(f); case Token_Semicolon: s = make_empty_stmt(f, token); next_token(f); return s; } ast_file_err(f, token, "Expected a statement, got `%.*s`", LIT(token_strings[token.kind])); fix_advance_to_next_stmt(f); return make_bad_stmt(f, token, f->cursor[0]); } AstNodeArray parse_stmt_list(AstFile *f) { AstNodeArray list = make_ast_node_array(f); while (f->cursor[0].kind != Token_case && f->cursor[0].kind != Token_default && f->cursor[0].kind != Token_CloseBrace && f->cursor[0].kind != Token_EOF) { AstNode *stmt = parse_stmt(f); if (stmt && stmt->kind != AstNode_EmptyStmt) { gb_array_append(list, stmt); } } return list; } ParseFileError init_ast_file(AstFile *f, String fullpath) { if (!string_has_extension(fullpath, make_string("odin"))) { gb_printf_err("Only `.odin` files are allowed\n"); return ParseFile_WrongExtension; } TokenizerInitError err = init_tokenizer(&f->tokenizer, fullpath); if (err == TokenizerInit_None) { gb_array_init(f->tokens, gb_heap_allocator()); for (;;) { Token token = tokenizer_get_token(&f->tokenizer); if (token.kind == Token_Invalid) return ParseFile_InvalidToken; gb_array_append(f->tokens, token); if (token.kind == Token_EOF) break; } f->cursor = &f->tokens[0]; // NOTE(bill): Is this big enough or too small? isize arena_size = gb_size_of(AstNode); arena_size *= 2*gb_array_count(f->tokens); gb_arena_init_from_allocator(&f->arena, gb_heap_allocator(), arena_size); f->curr_proc = NULL; return ParseFile_None; } switch (err) { case TokenizerInit_NotExists: return ParseFile_NotFound; case TokenizerInit_Permission: return ParseFile_Permission; case TokenizerInit_Empty: return ParseFile_EmptyFile; } return ParseFile_InvalidFile; } void destroy_ast_file(AstFile *f) { gb_arena_free(&f->arena); gb_array_free(f->tokens); gb_free(gb_heap_allocator(), f->tokenizer.fullpath.text); destroy_tokenizer(&f->tokenizer); } b32 init_parser(Parser *p) { gb_array_init(p->files, gb_heap_allocator()); gb_array_init(p->imports, gb_heap_allocator()); gb_array_init(p->libraries, gb_heap_allocator()); gb_array_init(p->system_libraries, gb_heap_allocator()); return true; } void destroy_parser(Parser *p) { // TODO(bill): Fix memory leak gb_for_array(i, p->files) { destroy_ast_file(&p->files[i]); } #if 1 gb_for_array(i, p->imports) { // gb_free(gb_heap_allocator(), p->imports[i].text); } #endif gb_array_free(p->files); gb_array_free(p->imports); gb_array_free(p->libraries); gb_array_free(p->system_libraries); } // NOTE(bill): Returns true if it's added b32 try_add_import_path(Parser *p, String path, TokenPos pos) { gb_for_array(i, p->imports) { String import = p->imports[i].path; if (are_strings_equal(import, path)) { return false; } } ImportedFile item; item.path = path; item.pos = pos; gb_array_append(p->imports, item); return true; } // NOTE(bill): Returns true if it's added b32 try_add_foreign_system_library_path(Parser *p, String import_file) { gb_for_array(i, p->system_libraries) { String import = p->system_libraries[i]; if (are_strings_equal(import, import_file)) { return false; } } gb_array_append(p->system_libraries, import_file); return true; } gb_global Rune illegal_import_runes[] = { '"', '\'', '`', ' ', '\\', // NOTE(bill): Disallow windows style filepaths '!', '$', '%', '^', '&', '*', '(', ')', '=', '+', '[', ']', '{', '}', ';', ':', '#', '|', ',', '<', '>', '?', }; b32 is_import_path_valid(String path) { if (path.len > 0) { u8 *start = path.text; u8 *end = path.text + path.len; u8 *curr = start; Rune r = -1; while (curr < end) { isize width = 1; r = curr[0]; if (r >= 0x80) { width = gb_utf8_decode(curr, end-curr, &r); if (r == GB_RUNE_INVALID && width == 1) return false; else if (r == GB_RUNE_BOM && curr-start > 0) return false; } for (isize i = 0; i < gb_count_of(illegal_import_runes); i++) { if (r == illegal_import_runes[i]) return false; } curr += width; } return true; } return false; } void parse_file(Parser *p, AstFile *f) { String filepath = f->tokenizer.fullpath; String base_dir = filepath; for (isize i = filepath.len-1; i >= 0; i--) { if (base_dir.text[i] == GB_PATH_SEPARATOR) break; base_dir.len--; } f->decls = parse_stmt_list(f); gb_for_array(i, f->decls) { AstNode *node = f->decls[i]; if (!is_ast_node_decl(node) && node->kind != AstNode_BadStmt && node->kind != AstNode_EmptyStmt) { // NOTE(bill): Sanity check ast_file_err(f, ast_node_token(node), "Only declarations are allowed at file scope"); } else { if (node->kind == AstNode_ImportDecl) { auto *id = &node->ImportDecl; String file_str = id->relpath.string; if (!is_import_path_valid(file_str)) { ast_file_err(f, ast_node_token(node), "Invalid `load` path"); continue; } isize str_len = base_dir.len+file_str.len; u8 *str = gb_alloc_array(gb_heap_allocator(), u8, str_len+1); defer (gb_free(gb_heap_allocator(), str)); gb_memcopy(str, base_dir.text, base_dir.len); gb_memcopy(str+base_dir.len, file_str.text, file_str.len); str[str_len] = '\0'; // HACK(bill): memory leak char *path_str = gb_path_get_full_name(gb_heap_allocator(), cast(char *)str); String import_file = make_string(path_str); id->fullpath = import_file; if (!try_add_import_path(p, import_file, ast_node_token(node).pos)) { // gb_free(gb_heap_allocator(), import_file.text); } } else if (node->kind == AstNode_ForeignSystemLibrary) { auto *id = &node->ForeignSystemLibrary; String file_str = id->filepath.string; if (!is_import_path_valid(file_str)) { ast_file_err(f, ast_node_token(node), "Invalid `foreign_system_library` path"); continue; } try_add_foreign_system_library_path(p, file_str); } } } } ParseFileError parse_files(Parser *p, char *init_filename) { char *fullpath_str = gb_path_get_full_name(gb_heap_allocator(), init_filename); String init_fullpath = make_string(fullpath_str); TokenPos init_pos = {}; ImportedFile init_imported_file = {init_fullpath, init_pos}; gb_array_append(p->imports, init_imported_file); p->init_fullpath = init_fullpath; gb_for_array(i, p->imports) { String import_path = p->imports[i].path; TokenPos pos = p->imports[i].pos; AstFile file = {}; ParseFileError err = init_ast_file(&file, import_path); if (err != ParseFile_None) { if (pos.line != 0) { gb_printf_err("%.*s(%td:%td) ", LIT(pos.file), pos.line, pos.column); } gb_printf_err("Failed to parse file: %.*s\n", LIT(import_path)); switch (err) { case ParseFile_WrongExtension: gb_printf_err("\tInvalid file extension\n"); break; case ParseFile_InvalidFile: gb_printf_err("\tInvalid file\n"); break; case ParseFile_EmptyFile: gb_printf_err("\tFile is empty\n"); break; case ParseFile_Permission: gb_printf_err("\tFile permissions problem\n"); break; case ParseFile_NotFound: gb_printf_err("\tFile cannot be found\n"); break; case ParseFile_InvalidToken: gb_printf_err("\tInvalid token found in file\n"); break; } return err; } parse_file(p, &file); gb_array_append(p->files, file); p->total_token_count += gb_array_count(file.tokens); } return ParseFile_None; }