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[vm] Allow manual loading of Mach-O dynamic library snapshots.

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Adds a Mach-O loader, similar to the existing ELF loader, that
can be used on platforms that do not support loading Mach-O dynamic
libraries via dlopen().

Other changes:

* Renames the --force-load-elf-from-memory command line argument
  to --force-load-from-memory.
* Use CPU_TYPE_ANY and CPU_SUBTYPE_ANY for architectures that do
  not have specific constants in <mach/machine.h> (e.g., RISCV),
  as the snapshot header check after loading also catches architecture
  mismatches.
* Emit the unwinding information at the end of the text segment
  for Windows Mach-O snapshots as is done for ELF ones.

TEST=vm/dart/unobfuscated_static_symbols_test
     vm/dart/use_dwarf_stack_traces_flag_test

Issue: https://github.com/dart-lang/sdk/issues/60307
Change-Id: I34a2a334f47d18d5c4f4a712956e71fd0ac94024
Cq-Include-Trybots: luci.dart.try:vm-aot-linux-debug-x64-try,vm-mac-release-arm64-try,vm-aot-mac-release-arm64-try,vm-aot-mac-release-x64-try,vm-aot-dwarf-linux-product-x64-try,vm-linux-debug-x64-try,vm-mac-debug-arm64-try,vm-fuchsia-release-x64-try,vm-fuchsia-release-arm64-try,vm-linux-debug-ia32-try,vm-aot-linux-debug-simarm_x64-try,vm-aot-linux-debug-simriscv32-try,vm-aot-linux-debug-simriscv64-try,vm-aot-linux-release-simarm_x64-try,vm-gcc-linux-try,vm-ubsan-linux-release-arm64-try,vm-aot-win-release-arm64-try,vm-aot-win-release-x64-try,vm-win-release-x64-try,vm-win-release-arm64-try,vm-aot-win-debug-arm64-try,vm-win-debug-arm64-try
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/430100
Reviewed-by: Slava Egorov <vegorov@google.com>
Reviewed-by: Ryan Macnak <rmacnak@google.com>
This commit is contained in:
Tess Strickland
2025-06-03 05:56:59 -07:00
committed by Commit Queue
parent b246cad216
commit f7699740cc
16 changed files with 1147 additions and 278 deletions
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runtime/platform/mach_o.h
+2 -1
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@@ -243,10 +243,11 @@ static constexpr uint32_t S_ATTR_SOME_INSTRUCTIONS = 0x00000400;
// ones used in our Mach-O writer are listed.
// Segment and section names for the text segment, which also contains
// constant data.
// constant data and unwinding information.
static constexpr char SEG_TEXT[] = "__TEXT";
static constexpr char SECT_TEXT[] = "__text";
static constexpr char SECT_CONST[] = "__const";
static constexpr char SECT_UNWIND_INFO[] = "__unwind_info";
// Segment and section names for the data segment, which contains
// non-constant data (like the BSS section).