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d2r2: fix line table build - correct program data size, correct special opcode application

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This commit is contained in:
Ryan Fleury
2026-05-03 17:55:53 -07:00
parent f2d80da2de
commit 7157e813a0
5 changed files with 13 additions and 10 deletions
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src/dwarf/dwarf_parse_2.c
+5 -1
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@@ -597,7 +597,7 @@ internal U64
dw2_read_line_table_header(Arena *arena, DW2_ParseCtx *ctx, String8 data, U64 off, DW2_LineTableHeader *out)
{
Temp scratch = scratch_begin(&arena, 1);
U64 start_off = 0;
U64 start_off = off;
//////////////////////////////
//- rjf: read unit length
@@ -637,6 +637,7 @@ dw2_read_line_table_header(Arena *arena, DW2_ParseCtx *ctx, String8 data, U64 of
//////////////////////////////
//- rjf: read all remaining flat header properties
//
U64 opl_header_length_off = 0;
U64 header_length = 0;
U8 min_inst_length = 0;
U8 max_ops_per_inst = 1;
@@ -646,6 +647,7 @@ dw2_read_line_table_header(Arena *arena, DW2_ParseCtx *ctx, String8 data, U64 of
U8 opcode_base = 0;
{
off += dw2_read_fmt_u64(data, off, format, &header_length);
opl_header_length_off = off;
off += str8_deserial_read_struct(data, off, &min_inst_length);
off += str8_deserial_read_struct(data, off, &max_ops_per_inst);
off += str8_deserial_read_struct(data, off, &default_is_stmt);
@@ -876,6 +878,8 @@ dw2_read_line_table_header(Arena *arena, DW2_ParseCtx *ctx, String8 data, U64 of
out->opcode_lengths = opcode_lengths;
out->dirs = dirs;
out->files = files;
out->line_program_off = opl_header_length_off + header_length;
out->total_unit_data_size = (off_opl - start_off);
}
U64 bytes_read = (off - start_off);
src/dwarf/dwarf_parse_2.h
+2
View File
@@ -180,6 +180,8 @@ struct DW2_LineTableHeader
U8 *opcode_lengths;
DW2_LineTableFileArray dirs;
DW2_LineTableFileArray files;
U64 line_program_off;
U64 total_unit_data_size; // NOTE(rjf): would be implied by `unit_length`, but DWARF makes that the size *past* the variable-width unit-length field itself
};
typedef struct DW2_LineVMRegs DW2_LineVMRegs;