4 commits

Author	SHA1	Message	Date
Alex Rønne Petersen	a4f95b1e61	std.debug.Dwarf.Unwind: deal with invalid def_cfa_reg by GNU toolchains	2025-10-02 15:27:35 +02:00
mlugg	156cd8f678	std.debug: significantly speed up capturing stack traces ... By my estimation, these changes speed up DWARF unwinding when using the self-hosted x86_64 backend by around 7x. There are two very significant enhancements: we no longer iterate frames which don't fit in the stack trace buffer, and we cache register rules (in a fixed buffer) to avoid re-parsing and evaluating CFI instructions in most cases. Alongside this are a bunch of smaller enhancements, such as pre-caching the result of evaluating the CIE's initial instructions, avoiding re-parsing of CIEs, and big simplifications to the `Dwarf.Unwind.VirtualMachine` logic.	2025-09-30 13:44:56 +01:00
mlugg	5e6a1919c7	fix aarch64-macos DWARF unwinding ... turns out this isn't technically specific to that target at all; other targets just don't emit mid-function 'ret' instructions as much so certain CFI instruction patterns were only seen on aarch64. thanks to jacob for finding the bug <3	2025-09-30 13:44:50 +01:00
mlugg	b750e7cf9e	change one million things	2025-09-30 13:44:49 +01:00