helper for checking if ELF has DWARF debug sections

src/dwarf/dwarf_coff.c

@@ -1,7 +1,68 @@
 // Copyright (c) 2024 Epic Games Tools
 // Licensed under the MIT license (https://opensource.org/license/mit/)
 
-#pragma once
+internal B32
+dw_is_dwarf_present_coff_section_table(String8             raw_image,
+                                       U64                 string_table_off,
+                                       U64                 section_count,
+                                       COFF_SectionHeader *sections)
+{
+  B32 is_dwarf_present = 0;
+
+  for (U64 i = 0; i < section_count; ++i) {
+    COFF_SectionHeader *header = &sections[i];
+    String8             name   = coff_name_from_section_header(raw_image, header, string_table_off);
+
+    DW_SectionKind s = dw_section_kind_from_string(name);
+    if (s == DW_Section_Null) {
+      s = dw_section_dwo_kind_from_string(name);
+    }
+
+    is_dwarf_present = s != DW_Section_Null;
+    if (is_dwarf_present) {
+      break;
+    }
+  }
+
+  return is_dwarf_present;
+}
+
+internal DW_Input
+dw_input_from_coff_section_table(Arena              *arena,
+                                 String8             raw_image,
+                                 U64                 string_table_off,
+                                 U64                 section_count,
+                                 COFF_SectionHeader *sections)
+{
+  DW_Input input                              = {0};
+  B32      sect_status[ArrayCount(input.sec)] = {0};
+
+  for (U64 i = 0; i < section_count; ++i) {
+    COFF_SectionHeader *header         = &sections[i];
+    Rng1U64             raw_data_range = rng_1u64(header->foff, header->foff + header->fsize);
+    String8             name           = coff_name_from_section_header(raw_image, header, string_table_off);
+
+    DW_SectionKind s      = dw_section_kind_from_string(name);
+    B32            is_dwo = 0;
+    if (s == DW_Section_Null) {
+      s      = dw_section_dwo_kind_from_string(name);
+      is_dwo = 1;
+    }
+
+    if (s != DW_Section_Null) {
+      if (sect_status[s]) {
+        Assert(!"too many debug sections with identical name, picking first");
+      } else {
+        sect_status[s] = 1;
+        DW_Section *d = &input.sec[s];
+        d->name       = push_str8_copy(arena, name);
+        d->data       = str8_substr(raw_image, raw_data_range);
+        d->is_dwo     = is_dwo;
+      }
+    }
+  }
+
+  return input;
+}
 
-internal DW_Input dw_input_from_coff_section_table(Arena *arena, String8 raw_image, U64 string_table_off, U64 section_count, COFF_SectionHeader *sections);