Jakub Konka b79884eaf0 macho: implement pruning of unused segments and sections ... This is a prelude to a more elaborate work which will implement `-dead_strip` flag - garbage collection of unreachable atoms. Here, when sorting sections, we also check that the section is actually populated with some atoms, and if not, we exclude it from the final linked image. This can happen when we do not import any symbols from dynamic libraries in which case we will not be populating the stubs sections or the GOT table, implying we can skip allocating those sections. Furthermore, we also make a check that a segment is actually occupied too, with the exception of `__TEXT` segment which is non-optional given that it wraps the header and load commands and thus is required by the `dyld` to perform dynamic linking, and `__PAGEZERO` which is generally non-optional when the linked image is an executable. For any other segment, if its section count is zero, we mark it as dead and skip allocating it and generating a load command for it. This commit also includes some minor improvements to the linker such as refactoring of the segment allocating codepaths, skipping `__PAGEZERO` generation for dylibs, and skipping generation of zero-sized atoms for special symbols such as `__mh_execute_header` and `___dso_handle`. These special symbols are only allocated local and global symbol pair and their VM addresses is set to the start of the `__TEXT` segment, but no `Atom` is created, as it's not necessary given that they never carry any machine code. Finally, we now always force-link against `libSystem` which turns out to be required for `dyld` to properly handle `LC_MAIN` load command on older macOS versions such as 10.15.7.		2022-07-01 22:05:22 +02:00
..
atomic	std: replace usage of std.meta.bitCount() with @bitSizeOf()	2022-04-27 11:10:52 +02:00
build	link-tests: do not save global extracted var unless a match	2022-06-28 10:23:25 +02:00
c	add const to msghdr_const iov and control pointers	2022-06-07 15:23:44 -04:00
compress	stage2: make error{} the same size as anyerror	2022-06-11 23:49:33 +03:00
crypto	crypto: add the Xoodoo permutation, prepare for Gimli deprecation (#11866)	2022-07-01 13:18:08 +02:00
dwarf	wasm: Implement debug info for parameters	2022-05-09 18:51:46 +02:00
event	std.event: use .{} to initiate Lock to unlocked state	2022-07-01 00:09:36 +03:00
fmt	add more corner case tests to float_parse (#11727)	2022-05-26 22:05:53 -04:00
fs	math: make cast return optional instead of an error	2022-05-27 16:43:33 -04:00
hash	std: fix crypto and hash benchmark	2022-04-24 23:01:06 -04:00
heap	Move sys_can_stack_trace from GPA to std.debug so that it can be re-used as needed	2022-06-25 21:27:56 -07:00
http	std: add http definitions for Method and Status (#10661)	2022-05-11 15:43:18 -04:00
io	Sema: add missing set_union_tag	2022-06-12 19:17:41 +03:00
json	std.json: Support disabling indent (#11823)	2022-06-29 11:53:01 +02:00
math	stage2: lower float negation explicitly	2022-06-30 00:02:00 -07:00
mem	Allocator: correct PanicFree function name	2022-05-02 15:29:27 -04:00
meta	std.meta.TrailerFlags: improve init type	2022-05-04 21:26:48 +02:00
net	LLVM: fix lowering of untagged union types	2022-06-30 02:43:05 -04:00
os	zig fmt: fix idempotency with newlines surrounding doc comment	2022-06-28 21:38:28 +02:00
rand	crypto: add the Xoodoo permutation, prepare for Gimli deprecation (#11866)	2022-07-01 13:18:08 +02:00
target
testing	Move sys_can_stack_trace from GPA to std.debug so that it can be re-used as needed	2022-06-25 21:27:56 -07:00
Thread	math: make cast return optional instead of an error	2022-05-27 16:43:33 -04:00
time
tz
unicode
valgrind
x	std.x.os.net: make error set consistent across targets	2022-06-27 18:26:50 -07:00
zig	zig fmt: fix idempotency with newlines surrounding doc comment	2022-06-28 21:38:28 +02:00
array_hash_map.zig	Sema: solve a false positive "depends on itself"	2022-05-06 22:40:57 -07:00
array_list.zig	std.ArrayList: use variable for local mutable state	2022-03-11 22:47:24 -07:00
ascii.zig
atomic.zig	std.Thread.Futex improvements (#11464)	2022-04-19 19:42:15 -05:00
base64.zig	std.base64: upgrade to new function pointer semantics	2022-03-30 20:38:01 -07:00
bit_set.zig	stage2: check that struct is a tuple when value tags differ in eql	2022-06-17 21:04:21 +03:00
bounded_array.zig	std/bounded_array.zig: Add Writer interface	2022-04-14 02:56:40 -04:00
buf_map.zig	reverse some of the now unneeded changes from squeek	2022-05-11 18:41:23 -06:00
buf_set.zig	std.BufSet.clone: fix key ownership	2022-03-01 13:28:47 -05:00
build.zig	build: handle weakly imported libs and frameworks	2022-06-28 09:19:01 +02:00
builtin.zig	Sema: improve index out of bounds panic message	2022-05-16 17:42:51 -07:00
c.zig	std.c: Move Darwin-unspecific functions from std/c/darwin.zig to std/c.zig	2022-05-07 00:02:15 +09:00
child_process.zig	math: make cast return optional instead of an error	2022-05-27 16:43:33 -04:00
coff.zig	std.coff: parse out codebase and entrypoint from optionalheader	2022-04-28 18:31:20 +03:00
compress.zig	stage2: small fixes + adjustments to std tests	2022-06-11 23:49:33 +03:00
comptime_string_map.zig
crypto.zig	crypto: add the Xoodoo permutation, prepare for Gimli deprecation (#11866)	2022-07-01 13:18:08 +02:00
cstr.zig
debug.zig	Merge pull request #11919 from squeek502/failing-allocator-stacktrace	2022-06-28 14:44:00 -04:00
dwarf.zig	math: make cast return optional instead of an error	2022-05-27 16:43:33 -04:00
dynamic_library.zig	math: make cast return optional instead of an error	2022-05-27 16:43:33 -04:00
elf.zig	target: Rename sparcv9 -> sparc64	2022-05-13 16:43:59 -04:00
enums.zig	deprecated TypeInfo in favor of Type	2022-03-08 20:38:12 +02:00
event.zig
fifo.zig
fmt.zig	stage2: lower float negation explicitly	2022-06-30 00:02:00 -07:00
fs.zig	std.fs: fix incorrect passing of pointer to temporary	2022-06-06 13:11:50 -07:00
hash.zig
hash_map.zig	std: fix missing hash map safety	2022-04-20 17:18:06 -07:00
heap.zig	std: update tests to stage2 semantics	2022-06-03 20:21:20 +03:00
http.zig	std: add http definitions for Method and Status (#10661)	2022-05-11 15:43:18 -04:00
io.zig	stage2: progress towards stage3	2022-04-14 10:12:45 -07:00
json.zig	std.json: Support disabling indent (#11823)	2022-06-29 11:53:01 +02:00
leb128.zig
linked_list.zig
log.zig
macho.zig	macho: implement pruning of unused segments and sections	2022-07-01 22:05:22 +02:00
math.zig	math: make cast return optional instead of an error	2022-05-27 16:43:33 -04:00
mem.zig	mem: add splitBackwards (#11908)	2022-06-29 08:23:09 +02:00
meta.zig	std: update tests to stage2 semantics	2022-06-03 20:21:20 +03:00
multi_array_list.zig	std.MultiArrayList: add functions addOne, pop, and popOrNull (#11553)	2022-04-29 22:51:53 -04:00
net.zig	std: adjust for stage2 semantics	2022-06-07 21:27:07 +03:00
once.zig
os.zig	std.os.execvpe: fix buffer overflow	2022-06-21 11:21:45 +02:00
packed_int_array.zig	zig fmt: remove trailing whitespace on doc comments	2022-04-05 18:08:33 +03:00
pdb.zig	std.pdb: fix incorrect use of packed struct	2022-05-02 22:06:02 -07:00
priority_dequeue.zig
priority_queue.zig	Revert "AstGen: preserve inferred ptr result loc for breaks"	2022-06-28 18:38:25 -07:00
process.zig	document that on Windows, all key arguments in EnvMap must be valid utf8	2022-05-11 18:41:23 -06:00
Progress.zig	std.Progress.log: adjust API	2022-05-26 21:58:19 -07:00
rand.zig	crypto: add the Xoodoo permutation, prepare for Gimli deprecation (#11866)	2022-07-01 13:18:08 +02:00
segmented_list.zig	std: disable tests that crash stage2	2022-06-03 20:21:20 +03:00
SemanticVersion.zig
simd.zig	std: adjust for stage2 semantics	2022-06-07 21:27:07 +03:00
sort.zig	std: add sort method to ArrayHashMap and MultiArrayList	2022-03-10 13:13:17 -05:00
start.zig	target: Rename sparcv9 -> sparc64	2022-05-13 16:43:59 -04:00
start_windows_tls.zig
std.zig	std: add http definitions for Method and Status (#10661)	2022-05-11 15:43:18 -04:00
target.zig	Bump support macOS versions; clean up allocs in llvm.targetTriple	2022-05-22 22:31:41 +02:00
testing.zig	checkAllAllocationFailures: add possibility of SwallowedOutOfMemoryError (split from NondeterministicMemoryUsage)	2022-06-23 17:20:24 -07:00
Thread.zig	math: make cast return optional instead of an error	2022-05-27 16:43:33 -04:00
time.zig	math: make cast return optional instead of an error	2022-05-27 16:43:33 -04:00
treap.zig	treap: zig fmt	2022-04-15 17:01:01 -05:00
tz.zig	std.tz: fix function returning pointer to local variable	2022-06-17 21:04:21 +03:00
unicode.zig	Sema: handle tuple and anon_struct in resolveTypeFully	2022-06-11 11:02:56 +03:00
valgrind.zig
wasm.zig
x.zig	stage2: small fixes + adjustments to std tests	2022-06-11 23:49:33 +03:00
zig.zig	stage2 parser: UTF-8 encode \u{NNNNNN} escape sequences	2022-03-02 14:45:19 -05:00