X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=type.c;h=ba2938d14460d6f980f697d1f9530ed753d4208a;hb=b732f96b591a9c4a4333bd1c1d4356723f362f6d;hp=d8921302d69cbe3e4caec38925f54554b5a5f79f;hpb=0ec8ab1be56a7215c7c6093d92ce6b9c66e4a81a;p=cparser

diff --git a/type.c b/type.c
index d892130..ba2938d 100644
--- a/type.c
+++ b/type.c
@@ -1,169 +1,1286 @@
+/*
+ * This file is part of cparser.
+ * Copyright (C) 2007-2008 Matthias Braun <matze@braunis.de>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+ * 02111-1307, USA.
+ */
 #include <config.h>
 
+#include <stdio.h>
+#include <assert.h>
+
 #include "type_t.h"
+#include "symbol_t.h"
+#include "type_hash.h"
 #include "adt/error.h"
+#include "lang_features.h"
+
+static struct obstack   _type_obst;
+static FILE            *out;
+struct obstack         *type_obst                 = &_type_obst;
+static int              type_visited              = 0;
+static bool             print_implicit_array_size = false;
+
+static void intern_print_type_pre(const type_t *type, bool top);
+static void intern_print_type_post(const type_t *type, bool top);
 
-static struct obstack  _type_obst;
-struct obstack        *type_obst = &_type_obst;
+typedef struct atomic_type_properties_t atomic_type_properties_t;
+struct atomic_type_properties_t {
+	unsigned   size;              /**< type size in bytes */
+	unsigned   alignment;         /**< type alignment in bytes */
+	unsigned   flags;             /**< type flags from atomic_type_flag_t */
+};
 
-void init_types()
+static atomic_type_properties_t atomic_type_properties[ATOMIC_TYPE_LAST+1] = {
+	//ATOMIC_TYPE_INVALID = 0,
+	[ATOMIC_TYPE_VOID] = {
+		.size       = 0,
+		.alignment  = 0,
+		.flags      = ATOMIC_TYPE_FLAG_NONE
+	},
+	[ATOMIC_TYPE_CHAR] = {
+		.size       = 1,
+		.alignment  = 1,
+		/* signed flag will be set when known */
+		.flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
+	},
+	[ATOMIC_TYPE_SCHAR] = {
+		.size       = 1,
+		.alignment  = 1,
+		.flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
+		              | ATOMIC_TYPE_FLAG_SIGNED,
+	},
+	[ATOMIC_TYPE_UCHAR] = {
+		.size       = 1,
+		.alignment  = 1,
+		.flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
+	},
+	[ATOMIC_TYPE_SHORT] = {
+		.size       = 2,
+		.alignment  = 2,
+		.flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
+		              | ATOMIC_TYPE_FLAG_SIGNED
+	},
+	[ATOMIC_TYPE_USHORT] = {
+		.size       = 2,
+		.alignment  = 2,
+		.flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
+	},
+	[ATOMIC_TYPE_INT] = {
+		.size       = (unsigned) -1,
+		.alignment  = (unsigned) -1,
+		.flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
+		              | ATOMIC_TYPE_FLAG_SIGNED,
+	},
+	[ATOMIC_TYPE_UINT] = {
+		.size       = (unsigned) -1,
+		.alignment  = (unsigned) -1,
+		.flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
+	},
+	[ATOMIC_TYPE_LONG] = {
+		.size       = (unsigned) -1,
+		.alignment  = (unsigned) -1,
+		.flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
+		              | ATOMIC_TYPE_FLAG_SIGNED,
+	},
+	[ATOMIC_TYPE_ULONG] = {
+		.size       = (unsigned) -1,
+		.alignment  = (unsigned) -1,
+		.flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
+	},
+	[ATOMIC_TYPE_LONGLONG] = {
+		.size       = (unsigned) -1,
+		.alignment  = (unsigned) -1,
+		.flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
+		              | ATOMIC_TYPE_FLAG_SIGNED,
+	},
+	[ATOMIC_TYPE_ULONGLONG] = {
+		.size       = (unsigned) -1,
+		.alignment  = (unsigned) -1,
+		.flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
+	},
+	[ATOMIC_TYPE_BOOL] = {
+		.size       = (unsigned) -1,
+		.alignment  = (unsigned) -1,
+		.flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
+	},
+	[ATOMIC_TYPE_FLOAT] = {
+		.size       = 4,
+		.alignment  = (unsigned) -1,
+		.flags      = ATOMIC_TYPE_FLAG_FLOAT | ATOMIC_TYPE_FLAG_ARITHMETIC
+		              | ATOMIC_TYPE_FLAG_SIGNED,
+	},
+	[ATOMIC_TYPE_DOUBLE] = {
+		.size       = 8,
+		.alignment  = (unsigned) -1,
+		.flags      = ATOMIC_TYPE_FLAG_FLOAT | ATOMIC_TYPE_FLAG_ARITHMETIC
+		              | ATOMIC_TYPE_FLAG_SIGNED,
+	},
+	[ATOMIC_TYPE_LONG_DOUBLE] = {
+		.size       = 12,
+		.alignment  = (unsigned) -1,
+		.flags      = ATOMIC_TYPE_FLAG_FLOAT | ATOMIC_TYPE_FLAG_ARITHMETIC
+		              | ATOMIC_TYPE_FLAG_SIGNED,
+	},
+	/* complex and imaginary types are set in init_types */
+};
+
+void init_types(void)
 {
 	obstack_init(type_obst);
+
+	atomic_type_properties_t *props = atomic_type_properties;
+
+	if(char_is_signed) {
+		props[ATOMIC_TYPE_CHAR].flags |= ATOMIC_TYPE_FLAG_SIGNED;
+	}
+
+	unsigned int_size   = machine_size < 32 ? 2 : 4;
+	unsigned long_size  = machine_size < 64 ? 4 : 8;
+	unsigned llong_size = machine_size < 32 ? 4 : 8;
+
+	props[ATOMIC_TYPE_INT].size            = int_size;
+	props[ATOMIC_TYPE_INT].alignment       = int_size;
+	props[ATOMIC_TYPE_UINT].size           = int_size;
+	props[ATOMIC_TYPE_UINT].alignment      = int_size;
+	props[ATOMIC_TYPE_LONG].size           = long_size;
+	props[ATOMIC_TYPE_LONG].alignment      = long_size;
+	props[ATOMIC_TYPE_ULONG].size          = long_size;
+	props[ATOMIC_TYPE_ULONG].alignment     = long_size;
+	props[ATOMIC_TYPE_LONGLONG].size       = llong_size;
+	props[ATOMIC_TYPE_LONGLONG].alignment  = llong_size;
+	props[ATOMIC_TYPE_ULONGLONG].size      = llong_size;
+	props[ATOMIC_TYPE_ULONGLONG].alignment = llong_size;
+
+	/* TODO: backend specific, need a way to query the backend for this.
+	 * The following are good settings for x86 */
+	props[ATOMIC_TYPE_FLOAT].alignment       = 4;
+	props[ATOMIC_TYPE_DOUBLE].alignment      = 4;
+	props[ATOMIC_TYPE_LONG_DOUBLE].alignment = 4;
+	props[ATOMIC_TYPE_LONGLONG].alignment    = 4;
+	props[ATOMIC_TYPE_ULONGLONG].alignment   = 4;
+
+	props[ATOMIC_TYPE_BOOL] = props[ATOMIC_TYPE_UINT];
 }
 
-void exit_types()
+void exit_types(void)
 {
 	obstack_free(type_obst, NULL);
 }
 
+void type_set_output(FILE *stream)
+{
+	out = stream;
+}
+
+void inc_type_visited(void)
+{
+	type_visited++;
+}
+
+void print_type_qualifiers(type_qualifiers_t qualifiers)
+{
+	if(qualifiers & TYPE_QUALIFIER_CONST)    fputs("const ",    out);
+	if(qualifiers & TYPE_QUALIFIER_VOLATILE) fputs("volatile ", out);
+	if(qualifiers & TYPE_QUALIFIER_RESTRICT) fputs("restrict ", out);
+}
+
+/**
+ * Prints the name of an atomic type kinds.
+ *
+ * @param kind  The type kind.
+ */
 static
-void print_type_qualifiers(FILE *out, const type_t *type)
+void print_atomic_kinds(atomic_type_kind_t kind)
 {
-	unsigned qualifiers = type->qualifiers;
-	if(qualifiers & TYPE_QUALIFIER_CONST) {
-		fputs("const ", out);
-	}
-	if(qualifiers & TYPE_QUALIFIER_VOLATILE) {
-		fputs("volatile ", out);
-	}
-	if(qualifiers & TYPE_QUALIFIER_RESTRICT) {
-		fputs("restrict ", out);
-	}
-	if(qualifiers & TYPE_QUALIFIER_INLINE) {
-		fputs("inline ", out);
+	const char *s = "INVALIDATOMIC";
+	switch(kind) {
+	case ATOMIC_TYPE_INVALID:                               break;
+	case ATOMIC_TYPE_VOID:        s = "void";               break;
+	case ATOMIC_TYPE_BOOL:        s = "_Bool";              break;
+	case ATOMIC_TYPE_CHAR:        s = "char";               break;
+	case ATOMIC_TYPE_SCHAR:       s = "signed char";        break;
+	case ATOMIC_TYPE_UCHAR:       s = "unsigned char";      break;
+	case ATOMIC_TYPE_INT:         s = "int";                break;
+	case ATOMIC_TYPE_UINT:        s = "unsigned int";       break;
+	case ATOMIC_TYPE_SHORT:       s = "short";              break;
+	case ATOMIC_TYPE_USHORT:      s = "unsigned short";     break;
+	case ATOMIC_TYPE_LONG:        s = "long";               break;
+	case ATOMIC_TYPE_ULONG:       s = "unsigned long";      break;
+	case ATOMIC_TYPE_LONGLONG:    s = "long long";          break;
+	case ATOMIC_TYPE_ULONGLONG:   s = "unsigned long long"; break;
+	case ATOMIC_TYPE_LONG_DOUBLE: s = "long double";        break;
+	case ATOMIC_TYPE_FLOAT:       s = "float";              break;
+	case ATOMIC_TYPE_DOUBLE:      s = "double";             break;
 	}
+	fputs(s, out);
 }
 
+/**
+ * Prints the name of an atomic type.
+ *
+ * @param type  The type.
+ */
 static
-void print_atomic_type(FILE *out, const atomic_type_t *type)
-{
-	print_type_qualifiers(out, & type->type);
-
-	switch(type->atype) {
-	case ATOMIC_TYPE_INVALID:     fputs("INVALIDATOMIC", out); return;
-	case ATOMIC_TYPE_VOID:        fputs("void", out); return;
-	case ATOMIC_TYPE_BOOL:        fputs("bool", out); return;
-	case ATOMIC_TYPE_CHAR:        fputs("char", out); return;
-	case ATOMIC_TYPE_SCHAR:       fputs("signed char", out); return;
-	case ATOMIC_TYPE_UCHAR:       fputs("unsigned char", out); return;
-	case ATOMIC_TYPE_INT:         fputs("int", out); return;
-	case ATOMIC_TYPE_UINT:        fputs("unsigned int", out); return;
-	case ATOMIC_TYPE_SHORT:       fputs("short", out); return;
-	case ATOMIC_TYPE_USHORT:      fputs("unsigned short", out); return;
-	case ATOMIC_TYPE_LONG:        fputs("long", out); return;
-	case ATOMIC_TYPE_ULONG:       fputs("unsigned long", out); return;
-	case ATOMIC_TYPE_LONGLONG:    fputs("long long", out); return;
-	case ATOMIC_TYPE_ULONGLONG:   fputs("unsigned long long", out); return;
-	case ATOMIC_TYPE_LONG_DOUBLE: fputs("long double", out); return;
-	case ATOMIC_TYPE_FLOAT:       fputs("float", out); return;
-	case ATOMIC_TYPE_DOUBLE:      fputs("double", out); return;
-	}
-	fputs("UNKNOWNATOMIC", out);
+void print_atomic_type(const atomic_type_t *type)
+{
+	print_type_qualifiers(type->base.qualifiers);
+	print_atomic_kinds(type->akind);
 }
 
+/**
+ * Prints the name of a complex type.
+ *
+ * @param type  The type.
+ */
 static
-void print_method_type(FILE *out, const method_type_t *type)
+void print_complex_type(const complex_type_t *type)
 {
-	print_type_qualifiers(out, & type->type);
+	print_type_qualifiers(type->base.qualifiers);
+	fputs("_Complex ", out);
+	print_atomic_kinds(type->akind);
+}
 
-	fputs("<", out);
-	print_type(out, type->result_type);
-	fputs(" ", out);
+/**
+ * Prints the name of an imaginary type.
+ *
+ * @param type  The type.
+ */
+static
+void print_imaginary_type(const imaginary_type_t *type)
+{
+	print_type_qualifiers(type->base.qualifiers);
+	fputs("_Imaginary ", out);
+	print_atomic_kinds(type->akind);
+}
 
-	fputs("method(", out);
-	method_parameter_type_t *param_type = type->parameter_types;
-	int first = 1;
-	while(param_type != NULL) {
+/**
+ * Print the first part (the prefix) of a type.
+ *
+ * @param type   The type to print.
+ * @param top    true, if this is the top type, false if it's an embedded type.
+ */
+static void print_function_type_pre(const function_type_t *type, bool top)
+{
+	print_type_qualifiers(type->base.qualifiers);
+
+	intern_print_type_pre(type->return_type, false);
+
+	/* don't emit braces if we're the toplevel type... */
+	if(!top)
+		fputc('(', out);
+}
+
+/**
+ * Print the second part (the postfix) of a type.
+ *
+ * @param type   The type to print.
+ * @param top    true, if this is the top type, false if it's an embedded type.
+ */
+static void print_function_type_post(const function_type_t *type,
+                                     const scope_t *scope, bool top)
+{
+	intern_print_type_post(type->return_type, false);
+	/* don't emit braces if we're the toplevel type... */
+	if(!top)
+		fputc(')', out);
+
+	fputc('(', out);
+
+	bool first = true;
+	if(scope == NULL) {
+		function_parameter_t *parameter = type->parameters;
+		for( ; parameter != NULL; parameter = parameter->next) {
+			if(first) {
+				first = false;
+			} else {
+				fputs(", ", out);
+			}
+			print_type(parameter->type);
+		}
+	} else {
+		declaration_t *parameter = scope->declarations;
+		for( ; parameter != NULL; parameter = parameter->next) {
+			if(first) {
+				first = false;
+			} else {
+				fputs(", ", out);
+			}
+			print_type_ext(parameter->type, parameter->symbol,
+			               &parameter->scope);
+		}
+	}
+	if(type->variadic) {
 		if(first) {
-			first = 0;
+			first = false;
 		} else {
 			fputs(", ", out);
 		}
-		print_type(out, param_type->type);
-		param_type = param_type->next;
+		fputs("...", out);
+	}
+	if(first && !type->unspecified_parameters) {
+		fputs("void", out);
 	}
-	fputs(")>", out);
+	fputc(')', out);
 }
 
-static
-void print_pointer_type(FILE *out, const pointer_type_t *type)
+/**
+ * Prints the prefix part of a pointer type.
+ *
+ * @param type   The pointer type.
+ */
+static void print_pointer_type_pre(const pointer_type_t *type)
 {
-	print_type(out, type->points_to);
+	intern_print_type_pre(type->points_to, false);
 	fputs("*", out);
-	print_type_qualifiers(out, &type->type);
+	print_type_qualifiers(type->base.qualifiers);
 }
 
-void print_type(FILE *out, const type_t *type)
+/**
+ * Prints the postfix part of a pointer type.
+ *
+ * @param type   The pointer type.
+ */
+static void print_pointer_type_post(const pointer_type_t *type)
 {
-	if(type == NULL) {
-		fputs("nil type", out);
-		return;
+	intern_print_type_post(type->points_to, false);
+}
+
+/**
+ * Prints the prefix part of an array type.
+ *
+ * @param type   The array type.
+ */
+static void print_array_type_pre(const array_type_t *type)
+{
+	intern_print_type_pre(type->element_type, false);
+}
+
+/**
+ * Prints the postfix part of an array type.
+ *
+ * @param type   The array type.
+ */
+static void print_array_type_post(const array_type_t *type)
+{
+	fputc('[', out);
+	if(type->is_static) {
+		fputs("static ", out);
+	}
+	print_type_qualifiers(type->base.qualifiers);
+	if(type->size_expression != NULL
+			&& (print_implicit_array_size || !type->has_implicit_size)) {
+		print_expression(type->size_expression);
 	}
+	fputc(']', out);
+	intern_print_type_post(type->element_type, false);
+}
+
+/**
+ * Prints the postfix part of a bitfield type.
+ *
+ * @param type   The array type.
+ */
+static void print_bitfield_type_post(const bitfield_type_t *type)
+{
+	fputs(" : ", out);
+	print_expression(type->size);
+	intern_print_type_post(type->base_type, false);
+}
+
+/**
+ * Prints an enum definition.
+ *
+ * @param declaration  The enum's type declaration.
+ */
+void print_enum_definition(const declaration_t *declaration)
+{
+	fputs("{\n", out);
 
-	switch(type->type) {
+	change_indent(1);
+
+	declaration_t *entry = declaration->next;
+	for( ; entry != NULL && entry->storage_class == STORAGE_CLASS_ENUM_ENTRY;
+	       entry = entry->next) {
+
+		print_indent();
+		fprintf(out, "%s", entry->symbol->string);
+		if(entry->init.initializer != NULL) {
+			fprintf(out, " = ");
+
+			/* skip the implicit cast */
+			expression_t *expression = entry->init.enum_value;
+			if(expression->kind == EXPR_UNARY_CAST_IMPLICIT) {
+				expression = expression->unary.value;
+			}
+			print_expression(expression);
+		}
+		fprintf(out, ",\n");
+	}
+
+	change_indent(-1);
+	print_indent();
+	fputs("}", out);
+}
+
+/**
+ * Prints an enum type.
+ *
+ * @param type  The enum type.
+ */
+static void print_type_enum(const enum_type_t *type)
+{
+	print_type_qualifiers(type->base.qualifiers);
+	fputs("enum ", out);
+
+	declaration_t *declaration = type->declaration;
+	symbol_t      *symbol      = declaration->symbol;
+	if(symbol != NULL) {
+		fputs(symbol->string, out);
+	} else {
+		print_enum_definition(declaration);
+	}
+}
+
+/**
+ * Print the compound part of a compound type.
+ *
+ * @param declaration  The declaration of the compound type.
+ */
+void print_compound_definition(const declaration_t *declaration)
+{
+	fputs("{\n", out);
+	change_indent(1);
+
+	declaration_t *iter = declaration->scope.declarations;
+	for( ; iter != NULL; iter = iter->next) {
+		print_indent();
+		print_declaration(iter);
+		fputc('\n', out);
+	}
+
+	change_indent(-1);
+	print_indent();
+	fputs("}", out);
+}
+
+/**
+ * Prints a compound type.
+ *
+ * @param type  The compound type.
+ */
+static void print_compound_type(const compound_type_t *type)
+{
+	print_type_qualifiers(type->base.qualifiers);
+
+	if(type->base.kind == TYPE_COMPOUND_STRUCT) {
+		fputs("struct ", out);
+	} else {
+		assert(type->base.kind == TYPE_COMPOUND_UNION);
+		fputs("union ", out);
+	}
+
+	declaration_t *declaration = type->declaration;
+	symbol_t      *symbol      = declaration->symbol;
+	if(symbol != NULL) {
+		fputs(symbol->string, out);
+	} else {
+		print_compound_definition(declaration);
+	}
+}
+
+/**
+ * Prints the prefix part of a typedef type.
+ *
+ * @param type   The typedef type.
+ */
+static void print_typedef_type_pre(const typedef_type_t *const type)
+{
+	print_type_qualifiers(type->base.qualifiers);
+	fputs(type->declaration->symbol->string, out);
+}
+
+/**
+ * Prints the prefix part of a typeof type.
+ *
+ * @param type   The typeof type.
+ */
+static void print_typeof_type_pre(const typeof_type_t *const type)
+{
+	fputs("typeof(", out);
+	if(type->expression != NULL) {
+		assert(type->typeof_type == NULL);
+		print_expression(type->expression);
+	} else {
+		print_type(type->typeof_type);
+	}
+	fputc(')', out);
+}
+
+/**
+ * Prints the prefix part of a type.
+ *
+ * @param type   The type.
+ * @param top    true if we print the toplevel type, false else.
+ */
+static void intern_print_type_pre(const type_t *const type, const bool top)
+{
+	switch(type->kind) {
+	case TYPE_ERROR:
+		fputs("<error>", out);
 	case TYPE_INVALID:
-		fputs("invalid", out);
+		fputs("<invalid>", out);
 		return;
 	case TYPE_ENUM:
-		print_type_qualifiers(out, type);
-		fputs("enum (TODO)", out);
+		print_type_enum(&type->enumt);
 		return;
 	case TYPE_ATOMIC:
-		print_atomic_type(out, (const atomic_type_t*) type);
+		print_atomic_type(&type->atomic);
+		return;
+	case TYPE_COMPLEX:
+		print_complex_type(&type->complex);
+		return;
+	case TYPE_IMAGINARY:
+		print_imaginary_type(&type->imaginary);
 		return;
 	case TYPE_COMPOUND_STRUCT:
 	case TYPE_COMPOUND_UNION:
-		print_type_qualifiers(out, type);
-		if(((const compound_type_t*) type)->symbol != NULL) {
-			fprintf(out, "%s", ((const compound_type_t*) type)->symbol->string);
-		}
+		print_compound_type(&type->compound);
 		return;
 	case TYPE_BUILTIN:
-		fputs(((builtin_type_t*) type)->symbol->string, out);
+		fputs(type->builtin.symbol->string, out);
 		return;
-	case TYPE_METHOD:
-		print_method_type(out, (const method_type_t*) type);
+	case TYPE_FUNCTION:
+		print_function_type_pre(&type->function, top);
 		return;
 	case TYPE_POINTER:
-		print_pointer_type(out, (const pointer_type_t*) type);
+		print_pointer_type_pre(&type->pointer);
+		return;
+	case TYPE_BITFIELD:
+		intern_print_type_pre(type->bitfield.base_type, top);
+		return;
+	case TYPE_ARRAY:
+		print_array_type_pre(&type->array);
+		return;
+	case TYPE_TYPEDEF:
+		print_typedef_type_pre(&type->typedeft);
+		return;
+	case TYPE_TYPEOF:
+		print_typeof_type_pre(&type->typeoft);
 		return;
 	}
 	fputs("unknown", out);
 }
 
-int type_valid(const type_t *type)
+/**
+ * Prints the postfix part of a type.
+ *
+ * @param type   The type.
+ * @param top    true if we print the toplevel type, false else.
+ */
+static void intern_print_type_post(const type_t *const type, const bool top)
+{
+	switch(type->kind) {
+	case TYPE_FUNCTION:
+		print_function_type_post(&type->function, NULL, top);
+		return;
+	case TYPE_POINTER:
+		print_pointer_type_post(&type->pointer);
+		return;
+	case TYPE_ARRAY:
+		print_array_type_post(&type->array);
+		return;
+	case TYPE_BITFIELD:
+		print_bitfield_type_post(&type->bitfield);
+		return;
+	case TYPE_ERROR:
+	case TYPE_INVALID:
+	case TYPE_ATOMIC:
+	case TYPE_COMPLEX:
+	case TYPE_IMAGINARY:
+	case TYPE_ENUM:
+	case TYPE_COMPOUND_STRUCT:
+	case TYPE_COMPOUND_UNION:
+	case TYPE_BUILTIN:
+	case TYPE_TYPEOF:
+	case TYPE_TYPEDEF:
+		break;
+	}
+}
+
+/**
+ * Prints a type.
+ *
+ * @param type   The type.
+ */
+void print_type(const type_t *const type)
 {
-	return type->type != TYPE_INVALID;
+	print_type_ext(type, NULL, NULL);
 }
 
-int is_type_int(const type_t *type)
+void print_type_ext(const type_t *const type, const symbol_t *symbol,
+                    const scope_t *scope)
 {
-	if(type->type != TYPE_ATOMIC)
-		return 0;
+	if(type == NULL) {
+		fputs("nil type", out);
+		return;
+	}
+
+	intern_print_type_pre(type, true);
+	if(symbol != NULL) {
+		fputc(' ', out);
+		fputs(symbol->string, out);
+	}
+	if(type->kind == TYPE_FUNCTION) {
+		print_function_type_post(&type->function, scope, true);
+	} else {
+		intern_print_type_post(type, true);
+	}
+}
+
+/**
+ * Return the size of a type AST node.
+ *
+ * @param type  The type.
+ */
+static size_t get_type_size(const type_t *type)
+{
+	switch(type->kind) {
+	case TYPE_ATOMIC:          return sizeof(atomic_type_t);
+	case TYPE_COMPLEX:         return sizeof(complex_type_t);
+	case TYPE_IMAGINARY:       return sizeof(imaginary_type_t);
+	case TYPE_COMPOUND_STRUCT:
+	case TYPE_COMPOUND_UNION:  return sizeof(compound_type_t);
+	case TYPE_ENUM:            return sizeof(enum_type_t);
+	case TYPE_FUNCTION:        return sizeof(function_type_t);
+	case TYPE_POINTER:         return sizeof(pointer_type_t);
+	case TYPE_ARRAY:           return sizeof(array_type_t);
+	case TYPE_BUILTIN:         return sizeof(builtin_type_t);
+	case TYPE_TYPEDEF:         return sizeof(typedef_type_t);
+	case TYPE_TYPEOF:          return sizeof(typeof_type_t);
+	case TYPE_BITFIELD:        return sizeof(bitfield_type_t);
+	case TYPE_ERROR:           panic("error type found");
+	case TYPE_INVALID:         panic("invalid type found");
+	}
+	panic("unknown type found");
+}
+
+/**
+ * Duplicates a type.
+ *
+ * @param type  The type to copy.
+ * @return A copy of the type.
+ *
+ * @note This does not produce a deep copy!
+ */
+type_t *duplicate_type(const type_t *type)
+{
+	size_t size = get_type_size(type);
+
+	type_t *copy = obstack_alloc(type_obst, size);
+	memcpy(copy, type, size);
+
+	return copy;
+}
 
-	atomic_type_t *atomic_type = (atomic_type_t*) type;
-	switch(atomic_type->atype) {
-	case ATOMIC_TYPE_CHAR:
-	case ATOMIC_TYPE_SCHAR:
-	case ATOMIC_TYPE_UCHAR:
-	case ATOMIC_TYPE_SHORT:
-	case ATOMIC_TYPE_USHORT:
-	case ATOMIC_TYPE_INT:
-	case ATOMIC_TYPE_UINT:
-	case ATOMIC_TYPE_LONG:
-	case ATOMIC_TYPE_ULONG:
-	case ATOMIC_TYPE_LONGLONG:
-	case ATOMIC_TYPE_ULONGLONG:
-		return 1;
+/**
+ * Returns the unqualified type of a given type.
+ *
+ * @param type  The type.
+ * @returns The unqualified type.
+ */
+type_t *get_unqualified_type(type_t *type)
+{
+	if(type->base.qualifiers == TYPE_QUALIFIER_NONE)
+		return type;
+
+	type_t *unqualified_type          = duplicate_type(type);
+	unqualified_type->base.qualifiers = TYPE_QUALIFIER_NONE;
+
+	type_t *result = typehash_insert(unqualified_type);
+	if(result != unqualified_type) {
+		obstack_free(type_obst, unqualified_type);
+	}
+
+	return result;
+}
+
+/**
+ * Check if a type is valid.
+ *
+ * @param type  The type to check.
+ * @return true if type represents a valid type.
+ */
+bool type_valid(const type_t *type)
+{
+	return type->kind != TYPE_INVALID;
+}
+
+static bool test_atomic_type_flag(atomic_type_kind_t kind,
+                                  atomic_type_flag_t flag)
+{
+	assert(kind <= ATOMIC_TYPE_LAST);
+	return (atomic_type_properties[kind].flags & flag) != 0;
+}
+
+/**
+ * Returns true if the given type is an integer type.
+ *
+ * @param type  The type to check.
+ * @return True if type is an integer type.
+ */
+bool is_type_integer(const type_t *type)
+{
+	assert(!is_typeref(type));
+
+	if(type->kind == TYPE_ENUM)
+		return true;
+
+	if(type->kind != TYPE_ATOMIC)
+		return false;
+
+	return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_INTEGER);
+}
+
+/**
+ * Returns true if the given type is an floating point type.
+ *
+ * @param type  The type to check.
+ * @return True if type is a floating point type.
+ */
+bool is_type_float(const type_t *type)
+{
+	assert(!is_typeref(type));
+
+	if(type->kind != TYPE_ATOMIC)
+		return false;
+
+	return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_FLOAT);
+}
+
+/**
+ * Returns true if the given type is a signed type.
+ *
+ * @param type  The type to check.
+ * @return True if type is a signed type.
+ */
+bool is_type_signed(const type_t *type)
+{
+	assert(!is_typeref(type));
+
+	/* enum types are int for now */
+	if(type->kind == TYPE_ENUM)
+		return true;
+
+	if(type->kind != TYPE_ATOMIC)
+		return false;
+
+	return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_SIGNED);
+}
+
+/**
+ * Returns true if the given type represents an arithmetic type.
+ *
+ * @param type  The type to check.
+ * @return True if type represents an arithmetic type.
+ */
+bool is_type_arithmetic(const type_t *type)
+{
+	assert(!is_typeref(type));
+
+	switch(type->kind) {
+	case TYPE_BITFIELD:
+	case TYPE_ENUM:
+		return true;
+	case TYPE_ATOMIC:
+		return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_ARITHMETIC);
+	case TYPE_COMPLEX:
+		return test_atomic_type_flag(type->complex.akind, ATOMIC_TYPE_FLAG_ARITHMETIC);
+	case TYPE_IMAGINARY:
+		return test_atomic_type_flag(type->imaginary.akind, ATOMIC_TYPE_FLAG_ARITHMETIC);
 	default:
-		return 0;
+		return false;
+	}
+}
+
+/**
+ * Returns true if the given type represents a scalar type.
+ *
+ * @param type  The type to check.
+ * @return True if type represents a scalar type.
+ */
+bool is_type_scalar(const type_t *type)
+{
+	assert(!is_typeref(type));
+
+	switch (type->kind) {
+		case TYPE_POINTER: return true;
+		case TYPE_BUILTIN: return is_type_scalar(type->builtin.real_type);
+		default:           break;
+	}
+
+	return is_type_arithmetic(type);
+}
+
+/**
+ * Check if a given type is incomplete.
+ *
+ * @param type  The type to check.
+ * @return True if the given type is incomplete (ie. just forward).
+ */
+bool is_type_incomplete(const type_t *type)
+{
+	assert(!is_typeref(type));
+
+	switch(type->kind) {
+	case TYPE_COMPOUND_STRUCT:
+	case TYPE_COMPOUND_UNION: {
+		const compound_type_t *compound_type = &type->compound;
+		declaration_t         *declaration   = compound_type->declaration;
+		return !declaration->init.complete;
+	}
+	case TYPE_ENUM: {
+		const enum_type_t *enum_type   = &type->enumt;
+		declaration_t     *declaration = enum_type->declaration;
+		return !declaration->init.complete;
+	}
+	case TYPE_BITFIELD:
+		return false;
+
+	case TYPE_FUNCTION:
+		return true;
+
+	case TYPE_ARRAY:
+		return type->array.size_expression == NULL;
+
+	case TYPE_ATOMIC:
+		return type->atomic.akind == ATOMIC_TYPE_VOID;
+
+	case TYPE_COMPLEX:
+		return type->complex.akind == ATOMIC_TYPE_VOID;
+
+	case TYPE_IMAGINARY:
+		return type->imaginary.akind == ATOMIC_TYPE_VOID;
+
+	case TYPE_POINTER:
+	case TYPE_BUILTIN:
+	case TYPE_ERROR:
+		return false;
+
+	case TYPE_TYPEDEF:
+	case TYPE_TYPEOF:
+		panic("is_type_incomplete called without typerefs skipped");
+	case TYPE_INVALID:
+		break;
+	}
+
+	panic("invalid type found");
+}
+
+/**
+ * Check if two function types are compatible.
+ */
+static bool function_types_compatible(const function_type_t *func1,
+                                      const function_type_t *func2)
+{
+	const type_t* const ret1 = skip_typeref(func1->return_type);
+	const type_t* const ret2 = skip_typeref(func2->return_type);
+	if (!types_compatible(ret1, ret2))
+		return false;
+
+	/* can parameters be compared? */
+	if(func1->unspecified_parameters || func2->unspecified_parameters)
+		return true;
+
+	if(func1->variadic != func2->variadic)
+		return false;
+
+	/* TODO: handling of unspecified parameters not correct yet */
+
+	/* all argument types must be compatible */
+	function_parameter_t *parameter1 = func1->parameters;
+	function_parameter_t *parameter2 = func2->parameters;
+	for( ; parameter1 != NULL && parameter2 != NULL;
+			parameter1 = parameter1->next, parameter2 = parameter2->next) {
+		type_t *parameter1_type = skip_typeref(parameter1->type);
+		type_t *parameter2_type = skip_typeref(parameter2->type);
+
+		parameter1_type = get_unqualified_type(parameter1_type);
+		parameter2_type = get_unqualified_type(parameter2_type);
+
+		if(!types_compatible(parameter1_type, parameter2_type))
+			return false;
+	}
+	/* same number of arguments? */
+	if(parameter1 != NULL || parameter2 != NULL)
+		return false;
+
+	return true;
+}
+
+/**
+ * Check if two array types are compatible.
+ */
+static bool array_types_compatible(const array_type_t *array1,
+                                   const array_type_t *array2)
+{
+	type_t *element_type1 = skip_typeref(array1->element_type);
+	type_t *element_type2 = skip_typeref(array2->element_type);
+	if(!types_compatible(element_type1, element_type2))
+		return false;
+
+	if(!array1->size_constant || !array2->size_constant)
+		return true;
+
+	return array1->size == array2->size;
+}
+
+/**
+ * Check if two types are compatible.
+ */
+bool types_compatible(const type_t *type1, const type_t *type2)
+{
+	assert(!is_typeref(type1));
+	assert(!is_typeref(type2));
+
+	/* shortcut: the same type is always compatible */
+	if(type1 == type2)
+		return true;
+
+	if(type1->base.qualifiers != type2->base.qualifiers)
+		return false;
+	if(type1->kind != type2->kind)
+		return false;
+
+	switch(type1->kind) {
+	case TYPE_FUNCTION:
+		return function_types_compatible(&type1->function, &type2->function);
+	case TYPE_ATOMIC:
+		return type1->atomic.akind == type2->atomic.akind;
+	case TYPE_COMPLEX:
+		return type1->complex.akind == type2->complex.akind;
+	case TYPE_IMAGINARY:
+		return type1->imaginary.akind == type2->imaginary.akind;
+	case TYPE_ARRAY:
+		return array_types_compatible(&type1->array, &type2->array);
+
+	case TYPE_POINTER: {
+		const type_t *const to1 = skip_typeref(type1->pointer.points_to);
+		const type_t *const to2 = skip_typeref(type2->pointer.points_to);
+		return types_compatible(to1, to2);
+	}
+
+	case TYPE_COMPOUND_STRUCT:
+	case TYPE_COMPOUND_UNION:
+	case TYPE_ENUM:
+	case TYPE_BUILTIN:
+		/* TODO: not implemented */
+		break;
+
+	case TYPE_BITFIELD:
+		/* not sure if this makes sense or is even needed, implement it if you
+		 * really need it! */
+		panic("type compatibility check for bitfield type");
+
+	case TYPE_ERROR:
+		/* Hmm, the error type should be compatible to all other types */
+		return true;
+	case TYPE_INVALID:
+		panic("invalid type found in compatible types");
+	case TYPE_TYPEDEF:
+	case TYPE_TYPEOF:
+		panic("typerefs not skipped in compatible types?!?");
+	}
+
+	/* TODO: incomplete */
+	return false;
+}
+
+/**
+ * Check if two pointer types are compatible.
+ */
+bool pointers_compatible(const type_t *type1, const type_t *type2)
+{
+	assert(!is_typeref(type1));
+	assert(!is_typeref(type2));
+
+	assert(type1->kind == TYPE_POINTER);
+	assert(type2->kind == TYPE_POINTER);
+	(void) type1;
+	(void) type2;
+	/* TODO */
+	return true;
+}
+
+/**
+ * Skip all typerefs and return the underlying type.
+ */
+type_t *skip_typeref(type_t *type)
+{
+	unsigned qualifiers = TYPE_QUALIFIER_NONE;
+
+	while(true) {
+		switch(type->kind) {
+		case TYPE_ERROR:
+			return type;
+		case TYPE_TYPEDEF: {
+			qualifiers |= type->base.qualifiers;
+			const typedef_type_t *typedef_type = &type->typedeft;
+			if(typedef_type->resolved_type != NULL) {
+				type = typedef_type->resolved_type;
+				break;
+			}
+			type = typedef_type->declaration->type;
+			continue;
+		}
+		case TYPE_TYPEOF: {
+			const typeof_type_t *typeof_type = &type->typeoft;
+			if(typeof_type->typeof_type != NULL) {
+				type = typeof_type->typeof_type;
+			} else {
+				type = typeof_type->expression->base.type;
+			}
+			continue;
+		}
+		default:
+			break;
+		}
+		break;
+	}
+
+	if (qualifiers != TYPE_QUALIFIER_NONE) {
+		type_t *const copy     = duplicate_type(type);
+		copy->base.qualifiers |= qualifiers;
+
+		type = typehash_insert(copy);
+		if (type != copy) {
+			obstack_free(type_obst, copy);
+		}
+	}
+
+	return type;
+}
+
+unsigned get_atomic_type_size(atomic_type_kind_t kind)
+{
+	assert(kind <= ATOMIC_TYPE_LAST);
+	return atomic_type_properties[kind].size;
+}
+
+unsigned get_atomic_type_alignment(atomic_type_kind_t kind)
+{
+	assert(kind <= ATOMIC_TYPE_LAST);
+	return atomic_type_properties[kind].alignment;
+}
+
+unsigned get_atomic_type_flags(atomic_type_kind_t kind)
+{
+	assert(kind <= ATOMIC_TYPE_LAST);
+	return atomic_type_properties[kind].flags;
+}
+
+atomic_type_kind_t get_intptr_kind(void)
+{
+	if(machine_size <= 32)
+		return ATOMIC_TYPE_INT;
+	else if(machine_size <= 64)
+		return ATOMIC_TYPE_LONG;
+	else
+		return ATOMIC_TYPE_LONGLONG;
+}
+
+atomic_type_kind_t get_uintptr_kind(void)
+{
+	if(machine_size <= 32)
+		return ATOMIC_TYPE_UINT;
+	else if(machine_size <= 64)
+		return ATOMIC_TYPE_ULONG;
+	else
+		return ATOMIC_TYPE_ULONGLONG;
+}
+
+/**
+ * Find the atomic type kind representing a given size (signed).
+ */
+atomic_type_kind_t find_signed_int_atomic_type_kind_for_size(unsigned size) {
+	static atomic_type_kind_t kinds[32];
+
+	assert(size < 32);
+	atomic_type_kind_t kind = kinds[size];
+	if(kind == ATOMIC_TYPE_INVALID) {
+		static const atomic_type_kind_t possible_kinds[] = {
+			ATOMIC_TYPE_SCHAR,
+			ATOMIC_TYPE_SHORT,
+			ATOMIC_TYPE_INT,
+			ATOMIC_TYPE_LONG,
+			ATOMIC_TYPE_LONGLONG
+		};
+		for(unsigned i = 0; i < sizeof(possible_kinds)/sizeof(possible_kinds[0]); ++i) {
+			if(get_atomic_type_size(possible_kinds[i]) == size) {
+				kind = possible_kinds[i];
+				break;
+			}
+		}
+		kinds[size] = kind;
+	}
+	return kind;
+}
+
+/**
+ * Find the atomic type kind representing a given size (signed).
+ */
+atomic_type_kind_t find_unsigned_int_atomic_type_kind_for_size(unsigned size) {
+	static atomic_type_kind_t kinds[32];
+
+	assert(size < 32);
+	atomic_type_kind_t kind = kinds[size];
+	if(kind == ATOMIC_TYPE_INVALID) {
+		static const atomic_type_kind_t possible_kinds[] = {
+			ATOMIC_TYPE_UCHAR,
+			ATOMIC_TYPE_USHORT,
+			ATOMIC_TYPE_UINT,
+			ATOMIC_TYPE_ULONG,
+			ATOMIC_TYPE_ULONGLONG
+		};
+		for(unsigned i = 0; i < sizeof(possible_kinds)/sizeof(possible_kinds[0]); ++i) {
+			if(get_atomic_type_size(possible_kinds[i]) == size) {
+				kind = possible_kinds[i];
+				break;
+			}
+		}
+		kinds[size] = kind;
 	}
+	return kind;
+}
+
+/**
+ * Hash the given type and return the "singleton" version
+ * of it.
+ */
+static type_t *identify_new_type(type_t *type)
+{
+	type_t *result = typehash_insert(type);
+	if(result != type) {
+		obstack_free(type_obst, type);
+	}
+	return result;
+}
+
+/**
+ * Creates a new atomic type.
+ *
+ * @param akind       The kind of the atomic type.
+ * @param qualifiers  Type qualifiers for the new type.
+ */
+type_t *make_atomic_type(atomic_type_kind_t akind, type_qualifiers_t qualifiers)
+{
+	type_t *type = obstack_alloc(type_obst, sizeof(atomic_type_t));
+	memset(type, 0, sizeof(atomic_type_t));
+
+	type->kind            = TYPE_ATOMIC;
+	type->base.qualifiers = qualifiers;
+	type->base.alignment  = get_atomic_type_alignment(akind);
+	type->atomic.akind    = akind;
+
+	return identify_new_type(type);
+}
+
+/**
+ * Creates a new complex type.
+ *
+ * @param akind       The kind of the atomic type.
+ * @param qualifiers  Type qualifiers for the new type.
+ */
+type_t *make_complex_type(atomic_type_kind_t akind, type_qualifiers_t qualifiers)
+{
+	type_t *type = obstack_alloc(type_obst, sizeof(complex_type_t));
+	memset(type, 0, sizeof(complex_type_t));
+
+	type->kind            = TYPE_COMPLEX;
+	type->base.qualifiers = qualifiers;
+	type->base.alignment  = get_atomic_type_alignment(akind);
+	type->complex.akind   = akind;
+
+	return identify_new_type(type);
+}
+
+/**
+ * Creates a new imaginary type.
+ *
+ * @param akind       The kind of the atomic type.
+ * @param qualifiers  Type qualifiers for the new type.
+ */
+type_t *make_imaginary_type(atomic_type_kind_t akind, type_qualifiers_t qualifiers)
+{
+	type_t *type = obstack_alloc(type_obst, sizeof(imaginary_type_t));
+	memset(type, 0, sizeof(imaginary_type_t));
+
+	type->kind            = TYPE_IMAGINARY;
+	type->base.qualifiers = qualifiers;
+	type->base.alignment  = get_atomic_type_alignment(akind);
+	type->imaginary.akind = akind;
+
+	return identify_new_type(type);
+}
+
+/**
+ * Creates a new pointer type.
+ *
+ * @param points_to   The points-to type for the new type.
+ * @param qualifiers  Type qualifiers for the new type.
+ */
+type_t *make_pointer_type(type_t *points_to, type_qualifiers_t qualifiers)
+{
+	type_t *type = obstack_alloc(type_obst, sizeof(pointer_type_t));
+	memset(type, 0, sizeof(pointer_type_t));
+
+	type->kind              = TYPE_POINTER;
+	type->base.qualifiers   = qualifiers;
+	type->base.alignment    = 0;
+	type->pointer.points_to = points_to;
+
+	return identify_new_type(type);
+}
+
+type_t *make_array_type(type_t *element_type, size_t size,
+                        type_qualifiers_t qualifiers)
+{
+	type_t *type = obstack_alloc(type_obst, sizeof(array_type_t));
+	memset(type, 0, sizeof(array_type_t));
+
+	type->kind                = TYPE_ARRAY;
+	type->base.qualifiers     = qualifiers;
+	type->base.alignment      = 0;
+	type->array.element_type  = element_type;
+	type->array.size          = size;
+	type->array.size_constant = true;
+
+	return identify_new_type(type);
 }
 
+/**
+ * Debug helper. Prints the given type to stdout.
+ */
 static __attribute__((unused))
 void dbg_type(const type_t *type)
 {
-	print_type(stdout,type);
+	FILE *old_out = out;
+	out = stderr;
+	print_type(type);
 	puts("\n");
-	fflush(stdout);
+	fflush(stderr);
+	out = old_out;
 }