checkpoint on simplified / stripped down dwarf -> rdi, and dwarf parsing helpers

src/dwarf/dwarf_parse_2.h

@@ -0,0 +1,117 @@
+// Copyright (c) Epic Games Tools
+// Licensed under the MIT license (https://opensource.org/license/mit/)
+
+#ifndef DWARF_PARSE_2_H
+#define DWARF_PARSE_2_H
+
+////////////////////////////////
+//~ rjf: Unit Headers
+
+typedef struct DW2_UnitHeader DW2_UnitHeader;
+struct DW2_UnitHeader
+{
+  DW_Version version;
+  DW_Format format;
+  U64 abbrev_off;
+  U64 addr_size;
+  DW_CompUnitKind kind;
+  U64 dwo_id;
+};
+
+////////////////////////////////
+//~ rjf: Abbreviation Map (ID -> .debug_abbrev Offset)
+
+typedef struct DW2_AbbrevMapNode DW2_AbbrevMapNode;
+struct DW2_AbbrevMapNode
+{
+  DW2_AbbrevMapNode *next;
+  U64 id;
+  U64 off;
+};
+
+typedef struct DW2_AbbrevMap DW2_AbbrevMap;
+struct DW2_AbbrevMap
+{
+  DW2_AbbrevMapNode **slots;
+  U64 slots_count;
+};
+
+////////////////////////////////
+//~ rjf: Tag Parsing Context
+
+typedef struct DW2_TagParseCtx DW2_TagParseCtx;
+struct DW2_TagParseCtx
+{
+  DW_Version version;
+  DW_Format format;
+  U64 addr_size;
+  String8 abbrev_data;
+  DW2_AbbrevMap *abbrev_map;
+};
+
+////////////////////////////////
+//~ rjf: Tag Attributes
+
+typedef struct DW2_AttribVal DW2_AttribVal;
+struct DW2_AttribVal
+{
+  DW_SectionKind section_kind;
+  U128 u128;
+};
+
+typedef struct DW2_Attrib DW2_Attrib;
+struct DW2_Attrib
+{
+  DW_AttribKind attrib_kind;
+  DW_FormKind form_kind;
+  DW2_AttribVal val;
+};
+
+typedef struct DW2_AttribNode DW2_AttribNode;
+struct DW2_AttribNode
+{
+  DW2_AttribNode *next;
+  DW2_Attrib v;
+};
+
+typedef struct DW2_AttribList DW2_AttribList;
+struct DW2_AttribList
+{
+  DW2_AttribNode *first;
+  DW2_AttribNode *last;
+  U64 count;
+};
+
+////////////////////////////////
+//~ rjf: Tags
+
+typedef struct DW2_Tag DW2_Tag;
+struct DW2_Tag
+{
+  DW_TagKind kind;
+  B32 has_children;
+  DW2_AttribList attribs;
+};
+
+////////////////////////////////
+//~ rjf: Basic Parsing Helpers
+
+internal U64 dw2_read_initial_length(String8 data, U64 off, U64 *out, DW_Format *fmt_out);
+internal U64 dw2_read_fmt_u64(String8 data, U64 off, DW_Format format, U64 *out);
+
+////////////////////////////////
+//~ rjf: Unit Header Parsing
+
+internal U64 dw2_read_unit_header(String8 data, U64 off, DW2_UnitHeader *out);
+
+////////////////////////////////
+//~ rjf: Abbreviation Map Parsing
+
+internal DW2_AbbrevMap dw2_abbrev_map_from_data(Arena *arena, String8 data, U64 off);
+
+////////////////////////////////
+//~ rjf: Tag Parsing
+
+internal U64 dw2_read_tag(Arena *arena, DW2_TagParseCtx *ctx, String8 data, U64 off, DW2_Tag *tag_out);
+
+#endif // DWARF_PARSE_2_H