3a01d14712
Lucet uses stack probes rather than explicit stack limit checks as Wasmtime does. In bytecodealliance/lucet#616, I have discovered that I previously was not running some Lucet runtime tests with the new backend, so was missing some test failures due to missing pieces in the new backend. This PR adds (i) calls to probestack, when enabled, in the prologue of every function with a stack frame larger than one page (configurable via flags); and (ii) trap metadata for every instruction on x86-64 that can access the stack, hence be the first point at which a stack overflow is detected when the stack pointer is decremented.
This crate contains the core Cranelift code generator. It translates code from an intermediate representation into executable machine code.