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libdrgn: handle GNU Debug Fission attributes, forms, and opcodes

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These are all equivalent to their DWARF 5 counterparts, which we already
support:

* DW_FORM_GNU_addr_index <-> DW_FORM_addrx
* DW_FORM_GNU_str_index <-> DW_FORM_strx
* DW_AT_GNU_addr_base <-> DW_AT_addr_base
* DW_OP_GNU_addr_index <-> DW_OP_addrx
* DW_OP_GNU_const_index <-> DW_OP_constx

Signed-off-by: Omar Sandoval <osandov@osandov.com>
This commit is contained in:
Omar Sandoval 2023-02-08 13:25:45 -08:00
parent 02e344a7dd
commit 94443457aa
1 changed files with 10 additions and 1 deletions
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11
libdrgn/dwarf_info.c
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@ -618,6 +618,8 @@ static struct drgn_error *dw_form_to_insn(struct drgn_dwarf_index_cu *cu,
case DW_FORM_addrx:
case DW_FORM_loclistx:
case DW_FORM_rnglistx:
case DW_FORM_GNU_addr_index:
case DW_FORM_GNU_str_index:
*insn_ret = INSN_SKIP_LEB128;
return NULL;
case DW_FORM_ref_addr:
@ -703,6 +705,7 @@ static struct drgn_error *dw_at_name_to_insn(struct drgn_dwarf_index_cu *cu,
*insn_ret = INSN_NAME_STRING;
return NULL;
case DW_FORM_strx:
case DW_FORM_GNU_str_index:
*insn_ret = INSN_NAME_STRX;
return NULL;
case DW_FORM_strx1:
@ -767,6 +770,7 @@ static struct drgn_error *dw_at_comp_dir_to_insn(struct drgn_dwarf_index_cu *cu,
*insn_ret = INSN_COMP_DIR_STRING;
return NULL;
case DW_FORM_strx:
case DW_FORM_GNU_str_index:
*insn_ret = INSN_COMP_DIR_STRX;
return NULL;
case DW_FORM_strx1:
@ -1599,6 +1603,7 @@ block:
case DW_FORM_sdata:
case DW_FORM_strx:
case DW_FORM_udata:
case DW_FORM_GNU_str_index:
return binary_buffer_skip_leb128(bb);
case DW_FORM_string:
return binary_buffer_skip_string(bb);
@ -3581,7 +3586,9 @@ static struct drgn_error *drgn_dwarf_next_addrx(struct binary_buffer *bb,
if (!*addr_base) {
Dwarf_Attribute attr_mem, *attr;
if (!(attr = dwarf_attr(cu_die, DW_AT_addr_base, &attr_mem))) {
if (!(attr = dwarf_attr(cu_die, DW_AT_addr_base, &attr_mem)) &&
!(attr = dwarf_attr(cu_die, DW_AT_GNU_addr_base,
&attr_mem))) {
return drgn_error_create(DRGN_ERROR_OTHER,
"indirect address without DW_AT_addr_base");
}
@ -4146,6 +4153,8 @@ drgn_eval_dwarf_expression(struct drgn_dwarf_expression_context *ctx,
break;
case DW_OP_addrx:
case DW_OP_constx:
case DW_OP_GNU_addr_index:
case DW_OP_GNU_const_index:
if (!ctx->cu_die.addr) {
ctx->bb.pos = ctx->bb.prev;
return NULL;