microfmt::exidx_table_searcher Class Reference

Binary search over sorted .ARM.exidx unwind tables. More...

#include <arm_exidx_search.hpp>

Static Public Member Functions
static constexpr uintptr_t	decode_prel31 (uintptr_t entry_addr, uint32_t prel31) noexcept
	Decodes a 31-bit program-relative (PREL31) offset.
static bool	find_exidx_entry (address_space_ref space, uintptr_t table_base, size_t num_entries, uintptr_t target_pc, uint32_t &out_unwind_data) noexcept
	Locates the unwind descriptor covering target_pc.

Detailed Description

Binary search over sorted .ARM.exidx unwind tables.

Member Function Documentation

decode_prel31()

static constexpr uintptr_t microfmt::exidx_table_searcher::decode_prel31 ( uintptr_t  entry_addr, uint32_t  prel31  )

inlinestaticconstexprnoexcept

Decodes a 31-bit program-relative (PREL31) offset.

Parameters

entry_addr	Address of the PREL31 word itself (base).
prel31	Raw PREL31 encoding.

Returns

Absolute address computed from the entry location.

find_exidx_entry()

static bool microfmt::exidx_table_searcher::find_exidx_entry ( address_space_ref  space, uintptr_t  table_base, size_t  num_entries, uintptr_t  target_pc, uint32_t &  out_unwind_data  )

inlinestaticnoexcept

Locates the unwind descriptor covering target_pc.

Performs a zero-allocation binary search over the sorted .ARM.exidx table, matching the highest function start not greater than target_pc.

Parameters

space	Address space to read from.
table_base	Base address of the .ARM.exidx table.
num_entries	Number of 8-byte table entries.
target_pc	PC being looked up.
out_unwind_data	Receives the descriptor (inline bytecode or .ARM.extab pointer).

Returns

true when a non-EXIDX_CANTUNWIND entry matched.

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The documentation for this class was generated from the following file:

• include/microfmt/inspector/arm_exidx_search.hpp