#include <assert.h>
#include <stdarg.h>
+#include "parser.h"
#include "lexer_t.h"
#include "token_t.h"
#include "type_t.h"
#include "ast_t.h"
#include "adt/bitfiddle.h"
#include "adt/error.h"
+#include "adt/array.h"
#define PRINT_TOKENS
-static token_t token;
+struct environment_entry_t {
+ symbol_t *symbol;
+ environment_entry_t *old_entry;
+ declaration_t *declaration;
+ unsigned short old_symbol_ID;
+};
+
+static token_t token;
+static struct obstack environment_obstack;
+static environment_entry_t **environment_stack = NULL;
+static translation_unit_t *translation_unit = NULL;
+static block_statement_t *context = NULL;
+
+static
+statement_t *parse_compound_statement(void);
+static
+statement_t *parse_statement(void);
+
+static
+expression_t *parse_sub_expression(unsigned precedence);
+static
+expression_t *parse_expression(void);
static inline
void *allocate_ast_zero(size_t size)
return res;
}
+static inline
+void *allocate_type_zero(size_t size)
+{
+ void *res = obstack_alloc(type_obst, size);
+ memset(res, 0, size);
+ return res;
+}
+
+/**
+ * pushs an environment_entry on the environment stack and links the
+ * corresponding symbol to the new entry
+ */
+static inline
+environment_entry_t *environment_push(symbol_t *symbol)
+{
+ environment_entry_t *entry
+ = obstack_alloc(&environment_obstack, sizeof(entry[0]));
+ memset(entry, 0, sizeof(entry[0]));
+
+ int top = ARR_LEN(environment_stack);
+ ARR_RESIZE(environment_stack, top + 1);
+ environment_stack[top] = entry;
+
+ entry->old_entry = symbol->thing;
+ entry->symbol = symbol;
+ symbol->thing = entry;
+
+ return entry;
+}
+
+/**
+ * pops symbols from the environment stack until @p new_top is the top element
+ */
+static inline
+void environment_pop_to(size_t new_top)
+{
+ environment_entry_t *entry = NULL;
+ size_t top = ARR_LEN(environment_stack);
+ size_t i;
+
+ if(new_top == top)
+ return;
+
+ assert(new_top < top);
+ i = top;
+ do {
+ entry = environment_stack[i - 1];
+
+ symbol_t *symbol = entry->symbol;
+
+#if 0
+ if(entry->type == ENTRY_LOCAL_VARIABLE
+ && entry->e.variable->refs == 0) {
+ variable_declaration_statement_t *variable = entry->e.variable;
+ print_warning_prefix(env, variable->statement.source_position);
+ fprintf(stderr, "variable '%s' was declared but never read\n",
+ symbol->string);
+ }
+#endif
+
+ if(entry->declaration->storage_class == STORAGE_CLASS_TYPEDEF) {
+ fprintf(stderr, "pop typename '%s'\n", entry->symbol->string);
+ symbol->ID = entry->old_symbol_ID;
+ }
+
+ assert(symbol->thing == entry);
+ symbol->thing = entry->old_entry;
+
+ --i;
+ } while(i != new_top);
+ obstack_free(&environment_obstack, entry);
+
+ ARR_SHRINKLEN(environment_stack, (int) new_top);
+}
+
+/**
+ * returns the top element of the environment stack
+ */
+static inline
+size_t environment_top()
+{
+ return ARR_LEN(environment_stack);
+}
+
+
+
static inline
void next_token(void)
{
} \
next_token();
+static expression_t *parse_constant_expression(void)
+{
+ /* TODO: not correct yet */
+ return parse_expression();
+}
+
+static compound_entry_t *parse_compound_type_entries(void);
+
+typedef struct declaration_specifiers_t declaration_specifiers_t;
+struct declaration_specifiers_t {
+ storage_class_t storage_class;
+ type_t *type;
+};
+
+static type_t *parse_struct_specifier(void)
+{
+ eat(T_struct);
+
+ compound_type_t *struct_type = allocate_type_zero(sizeof(struct_type[0]));
+ struct_type->type.type = TYPE_COMPOUND_STRUCT;
+ struct_type->source_position = source_position;
+
+ if(token.type == T_IDENTIFIER) {
+ /* TODO */
+ next_token();
+ if(token.type == '{') {
+ parse_compound_type_entries();
+ }
+ } else if(token.type == '{') {
+ parse_compound_type_entries();
+ } else {
+ parse_error_expected("problem while parsing struct type specifiers",
+ T_IDENTIFIER, '{');
+ return NULL;
+ }
+
+ return (type_t*) struct_type;
+}
+
+static type_t *parse_union_specifier(void)
+{
+ eat(T_union);
+
+ compound_type_t *union_type = allocate_type_zero(sizeof(union_type[0]));
+ union_type->type.type = TYPE_COMPOUND_UNION;
+ union_type->source_position = source_position;
+
+ if(token.type == T_IDENTIFIER) {
+ /* TODO */
+ next_token();
+ if(token.type == '{') {
+ parse_compound_type_entries();
+ }
+ } else if(token.type == '{') {
+ parse_compound_type_entries();
+ } else {
+ parse_error_expected("problem while parsing union type specifiers",
+ T_IDENTIFIER, '{');
+ }
+
+ return (type_t*) union_type;
+}
typedef enum {
SPECIFIER_SIGNED = 1 << 0,
#endif
} specifiers_t;
-typedef enum {
- STORAGE_CLASS_NONE,
- STORAGE_CLASS_TYPEDEF,
- STORAGE_CLASS_EXTERN,
- STORAGE_CLASS_STATIC,
- STORAGE_CLASS_AUTO,
- STORAGE_CLASS_REGISTER
-} storage_class_t;
+#define STORAGE_CLASSES \
+ case T_typedef: \
+ case T_extern: \
+ case T_static: \
+ case T_auto: \
+ case T_register:
+
+#define TYPE_QUALIFIERS \
+ case T_const: \
+ case T_restrict: \
+ case T_volatile: \
+ case T_inline: \
+ case T___extension__: \
+ case T___attribute__:
-typedef struct declaration_specifiers_t declaration_specifiers_t;
-struct declaration_specifiers_t {
- storage_class_t storage_class;
- type_t *type;
-};
+#ifdef PROVIDE_COMPLEX
+#define COMPLEX_SPECIFIERS \
+ case T__Complex:
+#else
+#define COMPLEX_SPECIFIERS
+#endif
+
+#ifdef PROVIDE_IMAGINARY
+#define IMAGINARY_SPECIFIERS \
+ case T__Imaginary:
+#else
+#define IMAGINARY_SPECIFIERS
+#endif
+
+#define TYPE_SPECIFIERS \
+ case T_TYPENAME: \
+ case T_void: \
+ case T_char: \
+ case T_short: \
+ case T_int: \
+ case T_long: \
+ case T_float: \
+ case T_double: \
+ case T_signed: \
+ case T_unsigned: \
+ case T__Bool: \
+ case T_struct: \
+ case T_union: \
+ case T_enum: \
+ case T___quad_t: \
+ case T___u_quad_t: \
+ COMPLEX_SPECIFIERS \
+ IMAGINARY_SPECIFIERS
static
void parse_declaration_specifiers(declaration_specifiers_t *specifiers)
{
- type_type_t type_type = TYPE_INVALID;
- atomic_type_type_t atomic_type = ATOMIC_TYPE_INVALID;
- unsigned type_qualifiers = 0;
- unsigned type_specifiers = 0;
+ type_t *type = NULL;
+ unsigned type_qualifiers = 0;
+ unsigned type_specifiers = 0;
while(1) {
switch(token.type) {
MATCH_TYPE_QUALIFIER(T_volatile, TYPE_QUALIFIER_VOLATILE);
MATCH_TYPE_QUALIFIER(T_inline, TYPE_QUALIFIER_INLINE);
+ case T___extension__:
+ /* TODO */
+ next_token();
+ break;
+
+ case T___attribute__:
+ fprintf(stderr, "TODO: __attribute__ not handled yet\n");
+ next_token();
+ break;
+
/* type specifiers */
#define MATCH_SPECIFIER(token, specifier, name) \
case token: \
case T_long:
next_token();
if(type_specifiers & SPECIFIER_LONG_LONG) {
- parse_error("too many long type specifiers given");
+ parse_error("multiple type specifiers given");
} else if(type_specifiers & SPECIFIER_LONG) {
type_specifiers |= SPECIFIER_LONG_LONG;
} else {
}
break;
+ case T___quad_t:
+ next_token();
+ if(type_specifiers & SPECIFIER_LONG_LONG ||
+ type_specifiers & SPECIFIER_LONG) {
+ parse_error("multiple type specifiers given");
+ } else {
+ type_specifiers |= specifier;
+ }
+ break;
+
+ type_specifiers
+
case T_struct:
+ type = parse_struct_specifier();
+ break;
+ case T_union:
+ type = parse_union_specifier();
+ break;
case T_enum:
/* TODO */
assert(0);
break;
+ case T_TYPENAME:
+ if(type != NULL || type_specifiers != 0) {
+ goto finish_specifiers;
+ }
+
+ type = token.v.symbol->thing->declaration->type;
+ assert(type != NULL);
+ next_token();
+ break;
+
/* function specifier */
default:
goto finish_specifiers;
}
finish_specifiers:
- if(type_type == TYPE_INVALID) {
+
+ if(type == NULL) {
+ atomic_type_type_t atomic_type;
+
/* match valid basic types */
switch(type_specifiers) {
case SPECIFIER_VOID:
atomic_type = ATOMIC_TYPE_INVALID;
}
- atomic_type_t *type = obstack_alloc(type_obst, sizeof(type[0]));
- memset(type, 0, sizeof(type[0]));
- type->type.type = TYPE_ATOMIC;
- type->type.qualifiers = type_qualifiers;
- type->atype = atomic_type;
-
- type_t *result = typehash_insert((type_t*) type);
- if(result != (type_t*) type) {
- obstack_free(type_obst, type);
- }
-
- specifiers->type = result;
+ atomic_type_t *atype = allocate_type_zero(sizeof(atype[0]));
+ atype->type.type = TYPE_ATOMIC;
+ atype->atype = atomic_type;
- fprintf(stderr, "Specifiers type: ");
- print_type(stderr, result);
- fprintf(stderr, "\n");
+ type = (type_t*) atype;
} else {
if(type_specifiers != 0) {
parse_error("multiple datatypes in declaration");
}
}
+
+ type->qualifiers = type_qualifiers;
+
+ type_t *result = typehash_insert(type);
+ if(result != (type_t*) type) {
+ obstack_free(type_obst, type);
+ }
+
+ specifiers->type = result;
+
+ fprintf(stderr, "Specifiers type: ");
+ print_type(stderr, result);
+ fprintf(stderr, "\n");
}
static
}
static
-void parse_declarator(const declaration_specifiers_t *specifiers)
+void parse_declarator(declaration_t *declaration, storage_class_t storage_class,
+ type_t *type)
{
- type_t *type = specifiers->type;
-
while(token.type == '*') {
/* pointer */
next_token();
pointer_type_t *pointer_type
- = obstack_alloc(type_obst, sizeof(pointer_type[0]));
- memset(pointer_type, 0, sizeof(pointer_type[0]));
+ = allocate_type_zero(sizeof(pointer_type[0]));
pointer_type->type.type = TYPE_POINTER;
pointer_type->points_to = type;
type = result;
}
+ declaration->storage_class = storage_class;
+ declaration->type = type;
switch(token.type) {
+ case T_TYPENAME:
case T_IDENTIFIER:
- (void) token.v.symbol;
+ declaration->symbol = token.v.symbol;
next_token();
break;
case '(':
next_token();
- parse_declarator(specifiers);
+ parse_declarator(declaration, storage_class, type);
expect_void(')');
- return;
+ break;
default:
parse_error("problem while parsing declarator");
}
fprintf(stderr, "Declarator type: ");
print_type(stderr, type);
fprintf(stderr, "\n");
+
+ symbol_t *symbol = declaration->symbol;
+
+ environment_entry_t *entry = environment_push(symbol);
+ entry->declaration = declaration;
+ entry->old_symbol_ID = symbol->ID;
+
+ if(storage_class == STORAGE_CLASS_TYPEDEF) {
+ symbol->ID = T_TYPENAME;
+ } else {
+ symbol->ID = T_IDENTIFIER;
+ }
}
+static
void parse_init_declarators(const declaration_specifiers_t *specifiers)
{
- parse_declarator(specifiers);
- if(token.type == '=') {
+ while(1) {
+ declaration_t *declaration = allocate_ast_zero(sizeof(declaration[0]));
+
+ parse_declarator(declaration, specifiers->storage_class,
+ specifiers->type);
+ if(token.type == '=') {
+ next_token();
+ // parse_initializer TODO
+ } else if(token.type == '{') {
+ parse_compound_statement();
+ return;
+ }
+
+ if(token.type != ',')
+ break;
+ next_token();
+ }
+ expect_void(';');
+}
+
+static
+void parse_struct_declarators(const declaration_specifiers_t *specifiers)
+{
+ while(1) {
+ declaration_t declaration;
+ compound_entry_t *entry = allocate_ast_zero(sizeof(entry[0]));
+
+ if(token.type == ':') {
+ next_token();
+ parse_constant_expression();
+ /* TODO */
+ } else {
+ parse_declarator(&declaration, specifiers->storage_class,
+ specifiers->type);
+
+ if(token.type == ':') {
+ next_token();
+ parse_constant_expression();
+ /* TODO */
+ }
+ }
+
+ if(token.type != ',')
+ break;
next_token();
- //parse_initialize();
}
+ expect_void(';');
+}
+
+static compound_entry_t *parse_compound_type_entries(void)
+{
+ eat('{');
+
+ compound_entry_t *entries = NULL;
+
+ while(token.type != '}' && token.type != T_EOF) {
+ declaration_specifiers_t specifiers;
+ memset(&specifiers, 0, sizeof(specifiers));
+ /* TODO not correct as this allows storage class stuff... but only
+ * specifiers and qualifiers sould be allowed here */
+ parse_declaration_specifiers(&specifiers);
+
+ parse_struct_declarators(&specifiers);
+ }
+ next_token();
+
+ return entries;
}
void parse_declaration(void)
memset(&specifiers, 0, sizeof(specifiers));
parse_declaration_specifiers(&specifiers);
+ if(token.type == ';') {
+ next_token();
+ return;
+ }
parse_init_declarators(&specifiers);
}
-static
-expression_t *parse_sub_expression(unsigned precedence);
-static
-expression_t *parse_expression(void);
-
typedef expression_t* (*parse_expression_function) (unsigned precedence);
typedef expression_t* (*parse_expression_infix_function) (unsigned precedence,
expression_t *left);
return (expression_t*) unary_expression; \
}
-CREATE_UNARY_EXPRESSION_PARSER('-', UNEXPR_NEGATE);
-CREATE_UNARY_EXPRESSION_PARSER('+', UNEXPR_PLUS);
-CREATE_UNARY_EXPRESSION_PARSER('!', UNEXPR_NOT);
-CREATE_UNARY_EXPRESSION_PARSER('*', UNEXPR_DEREFERENCE);
-CREATE_UNARY_EXPRESSION_PARSER('&', UNEXPR_TAKE_ADDRESS);
-CREATE_UNARY_EXPRESSION_PARSER('~', UNEXPR_BITWISE_NEGATE);
-CREATE_UNARY_EXPRESSION_PARSER(T_PLUSPLUS, UNEXPR_PREFIX_INCREMENT);
-CREATE_UNARY_EXPRESSION_PARSER(T_MINUSMINUS, UNEXPR_PREFIX_DECREMENT);
+CREATE_UNARY_EXPRESSION_PARSER('-', UNEXPR_NEGATE)
+CREATE_UNARY_EXPRESSION_PARSER('+', UNEXPR_PLUS)
+CREATE_UNARY_EXPRESSION_PARSER('!', UNEXPR_NOT)
+CREATE_UNARY_EXPRESSION_PARSER('*', UNEXPR_DEREFERENCE)
+CREATE_UNARY_EXPRESSION_PARSER('&', UNEXPR_TAKE_ADDRESS)
+CREATE_UNARY_EXPRESSION_PARSER('~', UNEXPR_BITWISE_NEGATE)
+CREATE_UNARY_EXPRESSION_PARSER(T_PLUSPLUS, UNEXPR_PREFIX_INCREMENT)
+CREATE_UNARY_EXPRESSION_PARSER(T_MINUSMINUS, UNEXPR_PREFIX_DECREMENT)
#define CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(token_type, unexpression_type) \
static \
return (expression_t*) unary_expression; \
}
-CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(T_PLUSPLUS, UNEXPR_POSTFIX_INCREMENT);
-CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(T_MINUSMINUS, UNEXPR_POSTFIX_DECREMENT);
+CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(T_PLUSPLUS, UNEXPR_POSTFIX_INCREMENT)
+CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(T_MINUSMINUS, UNEXPR_POSTFIX_DECREMENT)
#define CREATE_BINEXPR_PARSER(token_type, binexpression_type) \
static \
return (expression_t*) binexpr; \
}
-CREATE_BINEXPR_PARSER('*', BINEXPR_MUL);
-CREATE_BINEXPR_PARSER('/', BINEXPR_DIV);
-CREATE_BINEXPR_PARSER('+', BINEXPR_ADD);
-CREATE_BINEXPR_PARSER('-', BINEXPR_SUB);
-CREATE_BINEXPR_PARSER('<', BINEXPR_LESS);
-CREATE_BINEXPR_PARSER('>', BINEXPR_GREATER);
-CREATE_BINEXPR_PARSER('=', BINEXPR_ASSIGN);
-CREATE_BINEXPR_PARSER(T_EQUALEQUAL, BINEXPR_EQUAL);
-CREATE_BINEXPR_PARSER(T_SLASHEQUAL, BINEXPR_NOTEQUAL);
-CREATE_BINEXPR_PARSER(T_LESSEQUAL, BINEXPR_LESSEQUAL);
-CREATE_BINEXPR_PARSER(T_GREATEREQUAL, BINEXPR_GREATEREQUAL);
-CREATE_BINEXPR_PARSER('&', BINEXPR_BITWISE_AND);
-CREATE_BINEXPR_PARSER('|', BINEXPR_BITWISE_OR);
-CREATE_BINEXPR_PARSER('^', BINEXPR_BITWISE_XOR);
-CREATE_BINEXPR_PARSER(T_LESSLESS, BINEXPR_SHIFTLEFT);
-CREATE_BINEXPR_PARSER(T_GREATERGREATER, BINEXPR_SHIFTRIGHT);
+CREATE_BINEXPR_PARSER('*', BINEXPR_MUL)
+CREATE_BINEXPR_PARSER('/', BINEXPR_DIV)
+CREATE_BINEXPR_PARSER('+', BINEXPR_ADD)
+CREATE_BINEXPR_PARSER('-', BINEXPR_SUB)
+CREATE_BINEXPR_PARSER('<', BINEXPR_LESS)
+CREATE_BINEXPR_PARSER('>', BINEXPR_GREATER)
+CREATE_BINEXPR_PARSER('=', BINEXPR_ASSIGN)
+CREATE_BINEXPR_PARSER(T_EQUALEQUAL, BINEXPR_EQUAL)
+CREATE_BINEXPR_PARSER(T_SLASHEQUAL, BINEXPR_NOTEQUAL)
+CREATE_BINEXPR_PARSER(T_LESSEQUAL, BINEXPR_LESSEQUAL)
+CREATE_BINEXPR_PARSER(T_GREATEREQUAL, BINEXPR_GREATEREQUAL)
+CREATE_BINEXPR_PARSER('&', BINEXPR_BITWISE_AND)
+CREATE_BINEXPR_PARSER('|', BINEXPR_BITWISE_OR)
+CREATE_BINEXPR_PARSER('^', BINEXPR_BITWISE_XOR)
+CREATE_BINEXPR_PARSER(T_LESSLESS, BINEXPR_SHIFTLEFT)
+CREATE_BINEXPR_PARSER(T_GREATERGREATER, BINEXPR_SHIFTRIGHT)
static
expression_t *parse_sub_expression(unsigned precedence)
}
-static
-statement_t *parse_compound_statement(void);
-
-static
-statement_t *parse_statement(void);
-
static
statement_t *parse_case_statement(void)
{
return NULL;
}
+static
+statement_t *parse_declaration_statement(void)
+{
+ parse_declaration();
+ return NULL;
+}
+
static
statement_t *parse_statement(void)
{
case ';':
statement = NULL;
break;
+
+ STORAGE_CLASSES
+ TYPE_QUALIFIERS
+ TYPE_SPECIFIERS
+ statement = parse_declaration_statement();
+ break;
}
return statement;
static
statement_t *parse_compound_statement(void)
{
- expect('{');
+ eat('{');
+
+ int top = environment_top();
while(token.type != '}') {
parse_statement();
}
+
+ environment_pop_to(top);
+
next_token();
return NULL;
}
static
-void parse_translation_unit(void)
+translation_unit_t *parse_translation_unit(void)
{
- /*
- declaration_specifiers_t specifiers;
- memset(&specifiers, 0, sizeof(specifiers));
- parse_declaration_specifiers(&specifiers);
- */
+ translation_unit_t *unit = allocate_ast_zero(sizeof(unit[0]));
- while(token.type != T_EOF) {
- if(token.type == '{') {
- next_token();
- continue;
- }
+ assert(translation_unit == NULL);
+ assert(context == NULL);
+ translation_unit = unit;
+ while(token.type != T_EOF) {
parse_declaration();
- /* multiple declarations? */
-
- if(token.type == '{') {
- parse_compound_statement();
- } else if(token.type == ';') {
- next_token();
- } else {
- parse_error_expected("while parsing declarations", '{', ';', 0);
- }
}
+
+ translation_unit = NULL;
+ return unit;
}
-void parse(void)
+translation_unit_t *parse(void)
{
+ obstack_init(&environment_obstack);
+ environment_stack = NEW_ARR_F(environment_entry_t*, 0);
+
next_token();
- parse_translation_unit();
+ translation_unit_t *unit = parse_translation_unit();
+
+ DEL_ARR_F(environment_stack);
+ obstack_free(&environment_obstack, NULL);
+
+ return unit;
}
void init_parser(void)
projects / cparser / commitdiff