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zld: handle parsing and synthesising unwind info in the MachO linker #14397

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Merged
merged 9 commits into from
Jan 21, 2023
Merged

zld: handle parsing and synthesising unwind info in the MachO linker #14397

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835a60a
zld: parse, synthesise and emit unwind records
kubkon Jan 20, 2023
e0ccbff
link-tests: test unwind info emitter via c++ exceptions
kubkon Jan 20, 2023
eb0c959
link-tests: update uuid test with new uuid values
kubkon Jan 20, 2023
24f6c07
std.macho: add OLD = 0 as valid mode for both arm64 and x86_64
kubkon Jan 21, 2023
3dff040
macho: synthesise unwind records in absence of compact unwind section
kubkon Jan 21, 2023
02db993
macho: properly relocate target symbol address in __eh_frame
kubkon Jan 21, 2023
983e373
macho: fix sorting symbols by seniority
kubkon Jan 21, 2023
6fd1d7b
zld: fix 32bit build
kubkon Jan 21, 2023
241cabd
link-tests: do not expect __eh_frame section on x86_64-macos
kubkon Jan 21, 2023
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2 changes: 2 additions & 0 deletions CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -593,10 +593,12 @@ set(ZIG_STAGE2_SOURCES
"${CMAKE_SOURCE_DIR}/src/link/MachO/Object.zig"
"${CMAKE_SOURCE_DIR}/src/link/MachO/Relocation.zig"
"${CMAKE_SOURCE_DIR}/src/link/MachO/Trie.zig"
"${CMAKE_SOURCE_DIR}/src/link/MachO/UnwindInfo.zig"
"${CMAKE_SOURCE_DIR}/src/link/MachO/ZldAtom.zig"
"${CMAKE_SOURCE_DIR}/src/link/MachO/dyld_info/bind.zig"
"${CMAKE_SOURCE_DIR}/src/link/MachO/dyld_info/Rebase.zig"
"${CMAKE_SOURCE_DIR}/src/link/MachO/dead_strip.zig"
"${CMAKE_SOURCE_DIR}/src/link/MachO/eh_frame.zig"
"${CMAKE_SOURCE_DIR}/src/link/MachO/fat.zig"
"${CMAKE_SOURCE_DIR}/src/link/MachO/load_commands.zig"
"${CMAKE_SOURCE_DIR}/src/link/MachO/thunks.zig"
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2 changes: 2 additions & 0 deletions lib/std/macho.zig
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Expand Up @@ -2011,6 +2011,7 @@ pub const UNWIND_PERSONALITY_MASK: u32 = 0x30000000;
// x86_64
pub const UNWIND_X86_64_MODE_MASK: u32 = 0x0F000000;
pub const UNWIND_X86_64_MODE = enum(u4) {
OLD = 0,
RBP_FRAME = 1,
STACK_IMMD = 2,
STACK_IND = 3,
Expand Down Expand Up @@ -2039,6 +2040,7 @@ pub const UNWIND_X86_64_REG = enum(u3) {
// arm64
pub const UNWIND_ARM64_MODE_MASK: u32 = 0x0F000000;
pub const UNWIND_ARM64_MODE = enum(u4) {
OLD = 0,
FRAMELESS = 2,
DWARF = 3,
FRAME = 4,
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3 changes: 3 additions & 0 deletions src/link.zig
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Expand Up @@ -697,6 +697,7 @@ pub const File = struct {
/// TODO audit this error set. most of these should be collapsed into one error,
/// and ErrorFlags should be updated to convey the meaning to the user.
pub const FlushError = error{
BadDwarfCfi,
CacheUnavailable,
CurrentWorkingDirectoryUnlinked,
DivisionByZero,
Expand Down Expand Up @@ -737,6 +738,8 @@ pub const File = struct {
MissingEndForExpression,
/// TODO: this should be removed from the error set in favor of using ErrorFlags
MissingMainEntrypoint,
/// TODO: this should be removed from the error set in favor of using ErrorFlags
MissingSection,
MissingSymbol,
MissingTableSymbols,
ModuleNameMismatch,
Expand Down
526 changes: 432 additions & 94 deletions src/link/MachO/Object.zig
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