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wire DWARF expression eval to the unwinder

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This commit is contained in:
Nikita Smith
2026-06-02 12:10:39 -07:00
committed by Ryan Fleury
parent 8126f1f18e
commit c5677cf5f4
1 changed files with 13 additions and 2 deletions
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src/dwarf/dwarf_unwind.c
+13 -2
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@@ -261,8 +261,19 @@ dw_compute_cfa(Arch arch, DW_CFI_Row *row, void *reg_block, MachineOp_MemRead *m
}break;
case DW_CFA_Rule_Expression:
{
// TODO: evaluate expression
NotImplemented;
Temp scratch = scratch_begin(0,0);
DW_ExprValue value = {0};
DW_Expr expr = dw_expr_from_data(scratch.arena, DW_Format_32Bit, byte_size_from_arch(arch), row->cfa.expr);
DW_ExprEvalResult eval_result = dw_eval_expr(scratch.arena, arch, DW_Format_32Bit, 0, 0, 0, 9999, expr, reg_block, mem_read_func, mem_read_ud, &value);
if (eval_result == DW_ExprEvalResult_Ok) {
if (DW_ExprValueType_IsInt(value.type)) {
*cfa_out = value.u64;
unwind_status = MachineOpResult_Ok;
}
} else if (eval_result == DW_ExprEvalResult_Maybe) {
unwind_status = MachineOpResult_Maybe;
}
scratch_end(scratch);
}break;
}
return unwind_status;