hello.c

enum tree_code {
ERROR_MARK,
IDENTIFIER_NODE,
TREE_LIST,
TREE_VEC,
GCC_BLOCK,
OFFSET_TYPE,
ENUMERAL_TYPE,
BOOLEAN_TYPE,
INTEGER_TYPE,
REAL_TYPE,
POINTER_TYPE,
FIXED_POINT_TYPE,
REFERENCE_TYPE,
COMPLEX_TYPE,
VECTOR_TYPE,
ARRAY_TYPE,
RECORD_TYPE,
UNION_TYPE,
QUAL_UNION_TYPE,
VOID_TYPE,
FUNCTION_TYPE,
METHOD_TYPE,
LANG_TYPE,
INTEGER_CST,
REAL_CST,
FIXED_CST,
COMPLEX_CST,
VECTOR_CST,
STRING_CST,
FUNCTION_DECL,
LABEL_DECL,
FIELD_DECL,
VAR_DECL,
CONST_DECL,
PARM_DECL,
TYPE_DECL,
RESULT_DECL,
DEBUG_EXPR_DECL,
NAMESPACE_DECL,
IMPORTED_DECL,
TRANSLATION_UNIT_DECL,
COMPONENT_REF,
BIT_FIELD_REF,
REALPART_EXPR,
IMAGPART_EXPR,
ARRAY_REF,
ARRAY_RANGE_REF,
INDIRECT_REF,
ALIGN_INDIRECT_REF,
MISALIGNED_INDIRECT_REF,
OBJ_TYPE_REF,
CONSTRUCTOR,
COMPOUND_EXPR,
MODIFY_EXPR,
INIT_EXPR,
TARGET_EXPR,
COND_EXPR,
VEC_COND_EXPR,
BIND_EXPR,
CALL_EXPR,
WITH_CLEANUP_EXPR,
CLEANUP_POINT_EXPR,
PLACEHOLDER_EXPR,
PLUS_EXPR,
MINUS_EXPR,
MULT_EXPR,
POINTER_PLUS_EXPR,
TRUNC_DIV_EXPR,
CEIL_DIV_EXPR,
FLOOR_DIV_EXPR,
ROUND_DIV_EXPR,
TRUNC_MOD_EXPR,
CEIL_MOD_EXPR,
FLOOR_MOD_EXPR,
ROUND_MOD_EXPR,
RDIV_EXPR,
EXACT_DIV_EXPR,
FIX_TRUNC_EXPR,
FLOAT_EXPR,
NEGATE_EXPR,
MIN_EXPR,
MAX_EXPR,
ABS_EXPR,
LSHIFT_EXPR,
RSHIFT_EXPR,
LROTATE_EXPR,
RROTATE_EXPR,
BIT_IOR_EXPR,
BIT_XOR_EXPR,
BIT_AND_EXPR,
BIT_NOT_EXPR,
TRUTH_ANDIF_EXPR,
TRUTH_ORIF_EXPR,
TRUTH_AND_EXPR,
TRUTH_OR_EXPR,
TRUTH_XOR_EXPR,
TRUTH_NOT_EXPR,
LT_EXPR,
LE_EXPR,
GT_EXPR,
GE_EXPR,
EQ_EXPR,
NE_EXPR,
UNORDERED_EXPR,
ORDERED_EXPR,
UNLT_EXPR,
UNLE_EXPR,
UNGT_EXPR,
UNGE_EXPR,
UNEQ_EXPR,
LTGT_EXPR,
RANGE_EXPR,
PAREN_EXPR,
CONVERT_EXPR,
ADDR_SPACE_CONVERT_EXPR,
FIXED_CONVERT_EXPR,
NOP_EXPR,
NON_LVALUE_EXPR,
VIEW_CONVERT_EXPR,
COMPOUND_LITERAL_EXPR,
SAVE_EXPR,
ADDR_EXPR,
FDESC_EXPR,
COMPLEX_EXPR,
CONJ_EXPR,
PREDECREMENT_EXPR,
PREINCREMENT_EXPR,
POSTDECREMENT_EXPR,
POSTINCREMENT_EXPR,
VA_ARG_EXPR,
TRY_CATCH_EXPR,
TRY_FINALLY_EXPR,
DECL_EXPR,
LABEL_EXPR,
GOTO_EXPR,
RETURN_EXPR,
EXIT_EXPR,
LOOP_EXPR,
SWITCH_EXPR,
CASE_LABEL_EXPR,
ASM_EXPR,
SSA_NAME,
CATCH_EXPR,
EH_FILTER_EXPR,
SCEV_KNOWN,
SCEV_NOT_KNOWN,
POLYNOMIAL_CHREC,
STATEMENT_LIST,
ASSERT_EXPR,
TREE_BINFO,
WITH_SIZE_EXPR,
REALIGN_LOAD_EXPR,
TARGET_MEM_REF,
OMP_PARALLEL,
OMP_TASK,
OMP_FOR,
OMP_SECTIONS,
OMP_SINGLE,
OMP_SECTION,
OMP_MASTER,
OMP_ORDERED,
OMP_CRITICAL,
OMP_ATOMIC,
OMP_CLAUSE,
REDUC_MAX_EXPR,
REDUC_MIN_EXPR,
REDUC_PLUS_EXPR,
DOT_PROD_EXPR,
WIDEN_SUM_EXPR,
WIDEN_MULT_EXPR,
VEC_LSHIFT_EXPR,
VEC_RSHIFT_EXPR,
VEC_WIDEN_MULT_HI_EXPR,
VEC_WIDEN_MULT_LO_EXPR,
VEC_UNPACK_HI_EXPR,
VEC_UNPACK_LO_EXPR,
VEC_UNPACK_FLOAT_HI_EXPR,
VEC_UNPACK_FLOAT_LO_EXPR,
VEC_PACK_TRUNC_EXPR,
VEC_PACK_SAT_EXPR,
VEC_PACK_FIX_TRUNC_EXPR,
VEC_EXTRACT_EVEN_EXPR,
VEC_EXTRACT_ODD_EXPR,
VEC_INTERLEAVE_HIGH_EXPR,
VEC_INTERLEAVE_LOW_EXPR,
PREDICT_EXPR,
OPTIMIZATION_NODE,
TARGET_OPTION_NODE,
LAST_AND_UNUSED_TREE_CODE,
C_MAYBE_CONST_EXPR,
EXCESS_PRECISION_EXPR,
UNCONSTRAINED_ARRAY_TYPE,
UNCONSTRAINED_ARRAY_REF,
NULL_EXPR,
PLUS_NOMOD_EXPR,
MINUS_NOMOD_EXPR,
ATTR_ADDR_EXPR,
STMT_STMT,
LOOP_STMT,
EXIT_STMT,
OFFSET_REF,
PTRMEM_CST,
NEW_EXPR,
VEC_NEW_EXPR,
DELETE_EXPR,
VEC_DELETE_EXPR,
SCOPE_REF,
MEMBER_REF,
TYPE_EXPR,
AGGR_INIT_EXPR,
VEC_INIT_EXPR,
THROW_EXPR,
EMPTY_CLASS_EXPR,
BASELINK,
TEMPLATE_DECL,
TEMPLATE_PARM_INDEX,
TEMPLATE_TEMPLATE_PARM,
TEMPLATE_TYPE_PARM,
TYPENAME_TYPE,
TYPEOF_TYPE,
BOUND_TEMPLATE_TEMPLATE_PARM,
UNBOUND_CLASS_TEMPLATE,
USING_DECL,
USING_STMT,
DEFAULT_ARG,
TEMPLATE_ID_EXPR,
OVERLOAD,
PSEUDO_DTOR_EXPR,
MODOP_EXPR,
CAST_EXPR,
REINTERPRET_CAST_EXPR,
CONST_CAST_EXPR,
STATIC_CAST_EXPR,
DYNAMIC_CAST_EXPR,
DOTSTAR_EXPR,
TYPEID_EXPR,
NON_DEPENDENT_EXPR,
CTOR_INITIALIZER,
TRY_BLOCK,
EH_SPEC_BLOCK,
HANDLER,
MUST_NOT_THROW_EXPR,
CLEANUP_STMT,
IF_STMT,
FOR_STMT,
WHILE_STMT,
DO_STMT,
BREAK_STMT,
CONTINUE_STMT,
SWITCH_STMT,
EXPR_STMT,
TAG_DEFN,
OFFSETOF_EXPR,
SIZEOF_EXPR,
ARROW_EXPR,
ALIGNOF_EXPR,
STMT_EXPR,
UNARY_PLUS_EXPR,
STATIC_ASSERT,
TYPE_ARGUMENT_PACK,
NONTYPE_ARGUMENT_PACK,
TYPE_PACK_EXPANSION,
EXPR_PACK_EXPANSION,
ARGUMENT_PACK_SELECT,
TRAIT_EXPR,
LAMBDA_EXPR,
DECLTYPE_TYPE,
TEMPLATE_INFO,
URSHIFT_EXPR,
COMPARE_EXPR,
COMPARE_L_EXPR,
COMPARE_G_EXPR,
CLASS_INTERFACE_TYPE,
CLASS_IMPLEMENTATION_TYPE,
CATEGORY_INTERFACE_TYPE,
CATEGORY_IMPLEMENTATION_TYPE,
PROTOCOL_INTERFACE_TYPE,
KEYWORD_DECL,
INSTANCE_METHOD_DECL,
CLASS_METHOD_DECL,
MESSAGE_SEND_EXPR,
CLASS_REFERENCE_EXPR,
MAX_TREE_CODES
};

unsigned char tree_contains_struct[MAX_TREE_CODES][64]={};

enum tree_code_class {
  tcc_exceptional,
  tcc_constant,
  tcc_type,
  tcc_declaration,
  tcc_reference,
  tcc_comparison,
  tcc_unary,
  tcc_binary,
  tcc_statement,
  tcc_vl_exp,
  tcc_expression
};

// this is the format
struct tree_base {
  enum tree_code code : 16; // this is normally the tree code, but took it out for now
  unsigned side_effects_flag : 1;
  unsigned constant_flag : 1;
  unsigned addressable_flag : 1;
  unsigned volatile_flag : 1;
  unsigned readonly_flag : 1;
  unsigned unsigned_flag : 1;
  unsigned asm_written_flag: 1;
  unsigned nowarning_flag : 1;
  unsigned used_flag : 1;
  unsigned nothrow_flag : 1;
  unsigned static_flag : 1;
  unsigned public_flag : 1;
  unsigned private_flag : 1;
  unsigned protected_flag : 1;
  unsigned deprecated_flag : 1;
  unsigned saturating_flag : 1;
  unsigned default_def_flag : 1;
  unsigned lang_flag_0 : 1;
  unsigned lang_flag_1 : 1;
  unsigned lang_flag_2 : 1;
  unsigned lang_flag_3 : 1;
  unsigned lang_flag_4 : 1;
  unsigned lang_flag_5 : 1;
  unsigned lang_flag_6 : 1;
  unsigned visited : 1;
  unsigned packed_flag : 1;
  unsigned user_align : 1;
  unsigned nameless_flag : 1;
  unsigned spare : 12;
  unsigned address_space : 8;
};

struct s{
  int x;
};