#!/usr/bin/env bash
# Build the entire W65816 runtime — assemble *.s, compile *.c.
# Run after editing anything under runtime/src/.

set -euo pipefail
PROJECT_ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
LLVM_MC="$PROJECT_ROOT/tools/llvm-mos-build/bin/llvm-mc"
CLANG="$PROJECT_ROOT/tools/llvm-mos-build/bin/clang"
# Apply CPU/memory caps so a runaway backend bug can't OOM-kill the
# entire tmux scope.  Use `|| true` so when invoked from a parent that
# has already lowered the limit (e.g. smokeTest.sh sets 90s), we keep
# the parent's tighter cap rather than failing the build.
ulimit -v $((10 * 1024 * 1024)) 2>/dev/null || true
ulimit -t 1200 2>/dev/null || true

[ -x "$LLVM_MC" ] || { echo "llvm-mc not found at $LLVM_MC" >&2; exit 1; }
[ -x "$CLANG" ]   || { echo "clang not found at $CLANG" >&2; exit 1; }

SRC="$PROJECT_ROOT/runtime/src"
OUT="$PROJECT_ROOT/runtime"

asm() {
    local s="$1"
    local o="$OUT/$(basename "${s%.s}").o"
    echo "  AS  $(basename "$s")"
    "$LLVM_MC" -arch=w65816 -filetype=obj "$s" -o "$o"
}

cc() {
    local c="$1"
    local o="$OUT/$(basename "${c%.c}").o"
    local extra=("${@:2}")
    echo "  CC  $(basename "$c")"
    "$CLANG" -target w65816 -O2 -ffunction-sections \
        "${extra[@]}" \
        -I"$PROJECT_ROOT/runtime/include" \
        -c "$c" -o "$o"
}

asm "$SRC/crt0.s"
asm "$SRC/crt0Gsos.s"
asm "$SRC/crt0Gno.s"
asm "$SRC/gnoKernel.s"
asm "$SRC/gnoGsos.s"
cc  "$SRC/libcGno.c"
asm "$SRC/libgcc.s"
cc  "$SRC/libc.c"
cc  "$SRC/strtol.c"
cc  "$SRC/snprintf.c"
# Float-less snprintf for smoke checks that overshoot the single-bank
# IIgs IO window at $C000-$CFFF.  Same source file, gated by
# LLVM816_NO_FLOAT_PRINTF — skips emitDouble / emitHexFloat / decodeDouble
# / emitInfNan AND the float dispatch arms in format(), so the linker
# drops the softFloat / softDouble pull-in entirely.
echo "  CC  snprintf.c (no-float)"
"$CLANG" -target w65816 -O2 -ffunction-sections -DLLVM816_NO_FLOAT_PRINTF \
    -I"$PROJECT_ROOT/runtime/include" \
    -c "$SRC/snprintf.c" -o "$OUT/snprintfNoFloat.o"
cc  "$SRC/sscanf.c"
cc  "$SRC/qsort.c"
cc  "$SRC/extras.c"
cc  "$SRC/strtok.c"
cc  "$SRC/timeExt.c"
cc  "$SRC/math.c"
cc  "$SRC/softFloat.c"
cc  "$SRC/libcxxabi.c"
cc  "$SRC/libcxxabiSjlj.c"
cc  "$SRC/libunwindStub.c"
cc  "$SRC/desktop.c"
cc  "$SRC/sound.c"
cc  "$SRC/cursor.c"
cc  "$SRC/sprite.c"
cc  "$SRC/eventLoop.c"
cc  "$SRC/uiBuilder.c"
# resource.c is Phase 3.4 STUB-ONLY: bundler + linker integration ship,
# runtime LoadResource() returns RES_ERR_BLOCKED until Phase 1.1 (GS/OS
# fopen hang) lands.  Build it unconditionally so the typed-C facade
# links from any demo; the body is a 2-instruction stub today.
cc  "$SRC/resource.c"
asm "$SRC/iigsGsos.s"
asm "$SRC/iigsToolbox.s"
# softDouble.c builds at -O2.  dpack is noinline to dodge a backend
# stack-slot aliasing bug; dclass stays inline because pointer-arg
# stores from a noinline boundary use DBR-relative addressing (broken
# under DBR != 0).  Both choices documented in the source.
cc  "$SRC/softDouble.c"

# Phase 6.2 UBSan-min runtime.  MUST be compiled with
# `-fno-sanitize=undefined` — without that, the handlers would self-
# instrument on every integer op and recurse infinitely the first time
# UBSan fires.  Routed via the existing cc() helper but with the extra
# flag appended.  Built unconditionally so any user passing
# `-fsanitize=undefined -fsanitize-minimal-runtime` to their compile +
# `runtime/ubsan.o` to their link gets a fully-resolved symbol set.
cc  "$SRC/ubsan.c" -fno-sanitize=undefined

# Emit a manifest listing every .o this build produced.  CMake (Phase
# 2.6 of the gap-closure plan) consumes this as the single source of
# truth for the runtime object list, so a `file(GLOB)` in CMake doesn't
# pick up stale .bak files or out-of-tree leftovers.  One basename per
# line (no path, no extension); sorted for diff-stability.
MANIFEST="$OUT/.runtime-imports.list"
{
    echo "# runtime object manifest — produced by runtime/build.sh"
    echo "# Format: one .o filename per line (relative to runtime/)."
    echo "# Single source of truth for the W65816 runtime object set."
    echo "# Do not edit by hand; rerun runtime/build.sh to regenerate."
    ls -1 "$OUT"/*.o 2>/dev/null | xargs -n1 basename | sort
} >"$MANIFEST"

echo "runtime built: $(ls -1 "$OUT"/*.o | wc -l) objects"
echo "manifest: $MANIFEST"