authorgravatar for kubkon@jakubkonka.comJakub Konka <kubkon@jakubkonka.com> 2022-12-20 11:57:14+01:00
committergravatar for andrew@ziglang.orgAndrew Kelley <andrew@ziglang.org> 2023-01-09 15:09:52-07:00
log433709a78864cf65e1686d3178a05605e4c61c66
treef82acc9e11d8229ca47ccfadd7d9a7e4126c6eeb
parent0420ad0292b78322919a43e43014a728afdbbf3e

macho: add missing defs of compact unwind info records

1 files changed, 87 insertions(+), 0 deletions(-)

lib/std/macho.zig+87
...@@ -1912,3 +1912,90 @@ pub const LoadCommandIterator = struct {...@@ -1912,3 +1912,90 @@ pub const LoadCommandIterator = struct {
1912 return cmd;1912 return cmd;
1913 }1913 }
1914};1914};
1915
1916pub const compact_unwind_encoding_t = u32;
1917
1918// Relocatable object files: __LD,__compact_unwind
1919
1920pub const compact_unwind_entry = extern struct {
1921 rangeStart: u64,
1922 rangeLength: u32,
1923 compactUnwindEncoding: u32,
1924 personalityFunction: u64,
1925 lsda: u64,
1926};
1927
1928// Final linked images: __TEXT,__unwind_info
1929// The __TEXT,__unwind_info section is laid out for an efficient two level lookup.
1930// The header of the section contains a coarse index that maps function address
1931// to the page (4096 byte block) containing the unwind info for that function.
1932
1933pub const UNWIND_SECTION_VERSION = 1;
1934pub const UNWIND_SECOND_LEVEL_REGULAR = 2;
1935pub const UNWIND_SECOND_LEVEL_COMPRESSED = 3;
1936
1937pub const unwind_info_section_header = extern struct {
1938 /// UNWIND_SECTION_VERSION
1939 version: u32 = UNWIND_SECTION_VERSION,
1940 commonEncodingsArraySectionOffset: u32,
1941 commonEncodingsArrayCount: u32,
1942 personalityArraySectionOffset: u32,
1943 personalityArrayCount: u32,
1944 indexSectionOffset: u32,
1945 indexCount: u32,
1946 // compact_unwind_encoding_t[]
1947 // uint32_t personalities[]
1948 // unwind_info_section_header_index_entry[]
1949 // unwind_info_section_header_lsda_index_entry[]
1950};
1951
1952pub const unwind_info_section_header_index_entry = extern struct {
1953 functionOffset: u32,
1954
1955 /// section offset to start of regular or compress page
1956 secondLevelPagesSectionOffset: u32,
1957
1958 /// section offset to start of lsda_index array for this range
1959 lsdaIndexArraySectionOffset: u32,
1960};
1961
1962pub const unwind_info_section_header_lsda_index_entry = extern struct {
1963 functionOffset: u32,
1964 lsdaOffset: u32,
1965};
1966
1967// There are two kinds of second level index pages: regular and compressed.
1968// A compressed page can hold up to 1021 entries, but it cannot be used if
1969// too many different encoding types are used. The regular page holds 511
1970// entries.
1971
1972pub const unwind_info_regular_second_level_entry = extern struct {
1973 functionOffset: u32,
1974 encoding: compact_unwind_encoding_t,
1975};
1976
1977pub const unwind_info_regular_second_level_page_header = extern struct {
1978 /// UNWIND_SECOND_LEVEL_REGULAR
1979 kind: u32 = UNWIND_SECOND_LEVEL_REGULAR,
1980
1981 entryPageOffset: u16,
1982 entryCount: u16,
1983 // entry array
1984};
1985
1986pub const unwind_info_compressed_second_level_page_header = extern struct {
1987 /// UNWIND_SECOND_LEVEL_COMPRESSED
1988 kind: u32 = UNWIND_SECOND_LEVEL_COMPRESSED,
1989
1990 entryPageOffset: u16,
1991 entryCount: u16,
1992 encodingsPageOffset: u16,
1993 encodingsCount: u16,
1994 // 32bit entry array
1995 // encodings array
1996};
1997
1998pub const UnwindInfoCompressedEntry = packed struct(u32) {
1999 funcOffset: u24,
2000 encodingIndex: u8,
2001};