insndec.h: insn_decode() decodes one instruction into a readable form -
concrete registers as canonical roots (al/ah/ax/eax/rax -> one root), memory
base/index/scale/disp, immediate values, operand sizes, per-operand read/write,
and implicit operands/effects (rsp on push/pop, rdx:rax on mul/div, FLAGS). It
is ABI-agnostic: a call reports only its architectural effects.
codetrace.h: func_usedef(fn, abi, ...) computes per-instruction register
use/def over a function view (reusing cfg_blocks), splitting writes into
full-kill / partial / conditional so a reaching-definitions pass can be built on
top. With TRACE_ABI_WIN64 it marks the Win64 caller-saved set
(rax,rcx,rdx,r8-r11,xmm0-5,flags) clobbered at each call site; the clobber table
is confined to codetrace.c and the generic layer stays OS-agnostic
(TRACE_ABI_NONE keeps the conservative behaviour).
Both ride the existing optional disassembler seam (a second insn_decode_full
is added to semsig_backend.h; sem_insn and semsig_hash are untouched), gated
behind VMIE_HAVE_DISASM; OFF builds a stub. Adds the vmie_win32_func_usedef
wrapper. No new build option - the feature shares VMIE_DISASM with semsig.
New semsig_hash(mem_view_t) primitive (include/semsig.h): a position-,
register-, immediate- and instruction-order-invariant function fingerprint.
It folds per-instruction operand-canonical tokens, splitting the body into
basic blocks via cfg_blocks and using a within-block order-insensitive
sort-then-fold (between-block order preserved), so it survives compiler
register reallocation and instruction scheduling that the byte-mask
func_hash/sig_generate cannot. Distinct hash domain from func_hash.
The operand decode is delegated to an OPTIONAL external disassembler behind
a private adapter seam (src/handlers/semsig_backend.h); semsig.c stays
backend-neutral and includes no backend header. VMIE_DISASM={OFF|zydis|
capstone} gates the build: OFF (default) compiles only semsig_stub.c and
keeps the zero-dependency build (VMIE_HAVE_DISASM=0, packages unchanged).
The backend is brought from VMIE_DISASM_SRC or find_package - never
vendored. Adds the vmie_win32_func_semsig wrapper.
The CI deb job builds with the Zydis backend (libzydis-dev); the runtime
package dependency on libzydis is derived automatically by dpkg-shlibdeps.
lirent
