#!/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"

[ -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 "$SRC/libgcc.s"
cc  "$SRC/libc.c"
cc  "$SRC/strtol.c"
cc  "$SRC/snprintf.c"
cc  "$SRC/sscanf.c"
cc  "$SRC/qsort.c"
cc  "$SRC/extras.c"
cc  "$SRC/strtok.c"
cc  "$SRC/timeExt.c" -O1
# timeExt.c at -O1: -O2 generates code where strftime's directive
# switch overflows the W65816's 8-bit signed stack-relative offset
# range. -O1 keeps the per-function frame small enough.
cc  "$SRC/math.c"
cc  "$SRC/softFloat.c"
cc  "$SRC/libcxxabi.c"
cc  "$SRC/libcxxabiSjlj.c"
asm "$SRC/iigsGsos.s"
# softDouble.c builds at -O1: __muldf3's u64 live-range pressure
# overflows the greedy allocator at -O2.  dpack is already noinline
# to reduce pressure, but dclass MUST stay inline (its pointer-arg
# writes from a noinline boundary would lower to `sta (d,s),y` which
# uses DBR for the bank — silently corrupted under DBR != 0, caught
# by the dmul-after-bank-switch test).  -O1 sidesteps this.
cc  "$SRC/softDouble.c" -O1

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