- Generated by
1.8.1.1
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GCC Middle and Back End API Reference
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#include <tree-core.h>
Data Fields | |
| ENUM_BITFIELD(tree_code) code unsigned | side_effects_flag: 1 |
| unsigned | constant_flag: 1 |
| unsigned | addressable_flag: 1 |
| unsigned | volatile_flag: 1 |
| unsigned | readonly_flag: 1 |
| unsigned | asm_written_flag: 1 |
| unsigned | nowarning_flag: 1 |
| unsigned | visited: 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 | default_def_flag: 1 |
| union { | |
| struct { | |
| 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 saturating_flag: 1 | |
| unsigned unsigned_flag: 1 | |
| unsigned packed_flag: 1 | |
| unsigned user_align: 1 | |
| unsigned nameless_flag: 1 | |
| unsigned spare0: 4 | |
| unsigned spare1: 8 | |
| unsigned address_space: 8 | |
| } bits | |
| int length | |
| unsigned int version | |
| } | u |
A tree node can represent a data type, a variable, an expression or a statement. Each node has a TREE_CODE which says what kind of thing it represents. Some common codes are: INTEGER_TYPE – represents a type of integers. ARRAY_TYPE – represents a type of pointer. VAR_DECL – represents a declared variable. INTEGER_CST – represents a constant integer value. PLUS_EXPR – represents a sum (an expression).
As for the contents of a tree node: there are some fields that all nodes share. Each TREE_CODE has various special-purpose fields as well. The fields of a node are never accessed directly, always through accessor macros. Every kind of tree node starts with this structure, so all nodes have these fields.
See the accessor macros, defined below, for documentation of the fields, and the table below which connects the fields and the accessor macros.
| unsigned tree_base::address_space |
This field is only used with TREE_TYPE nodes; the only reason it is present in tree_base instead of tree_type is to save space. The size of the field must be large enough to hold addr_space_t values.
| unsigned tree_base::addressable_flag |
| unsigned tree_base::asm_written_flag |
| struct { ... } tree_base::bits |
The bits in the following structure should only be used with accessor macros that constrain inputs with tree checking.
| unsigned tree_base::constant_flag |
| unsigned tree_base::default_def_flag |
| unsigned tree_base::deprecated_flag |
| unsigned tree_base::lang_flag_0 |
| unsigned tree_base::lang_flag_1 |
| unsigned tree_base::lang_flag_2 |
| unsigned tree_base::lang_flag_3 |
| unsigned tree_base::lang_flag_4 |
| unsigned tree_base::lang_flag_5 |
| unsigned tree_base::lang_flag_6 |
| int tree_base::length |
The following fields are present in tree_base to save space. The nodes using them do not require any of the flags above and so can make better use of the 4-byte sized word. VEC length. This field is only used with TREE_VEC.
| unsigned tree_base::nameless_flag |
| unsigned tree_base::nothrow_flag |
| unsigned tree_base::nowarning_flag |
| unsigned tree_base::packed_flag |
| unsigned tree_base::private_flag |
| unsigned tree_base::protected_flag |
| unsigned tree_base::public_flag |
| unsigned tree_base::readonly_flag |
| unsigned tree_base::saturating_flag |
| ENUM_BITFIELD (tree_code) code unsigned tree_base::side_effects_flag |
| unsigned tree_base::spare0 |
| unsigned tree_base::spare1 |
| unsigned tree_base::static_flag |
| union { ... } tree_base::u |
| unsigned tree_base::unsigned_flag |
| unsigned tree_base::used_flag |
| unsigned tree_base::user_align |
| unsigned int tree_base::version |
SSA version number. This field is only used with SSA_NAME.
| unsigned tree_base::visited |
| unsigned tree_base::volatile_flag |
1.8.1.1