138 lines
3.4 KiB
C++
138 lines
3.4 KiB
C++
#include "cs_bcode.hh"
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#include "cs_state.hh"
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#include "cs_thread.hh"
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namespace cubescript {
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/* public API impls */
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LIBCUBESCRIPT_EXPORT bcode_ref::bcode_ref(bcode *v): p_code(v) {
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bcode_addref(v->get_raw());
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}
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LIBCUBESCRIPT_EXPORT bcode_ref::bcode_ref(bcode_ref const &v):
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p_code(v.p_code)
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{
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bcode_addref(p_code->get_raw());
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}
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LIBCUBESCRIPT_EXPORT bcode_ref::~bcode_ref() {
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bcode_unref(p_code->get_raw());
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}
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LIBCUBESCRIPT_EXPORT bcode_ref &bcode_ref::operator=(
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bcode_ref const &v
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) {
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bcode_unref(p_code->get_raw());
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p_code = v.p_code;
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bcode_addref(p_code->get_raw());
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return *this;
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}
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LIBCUBESCRIPT_EXPORT bcode_ref &bcode_ref::operator=(bcode_ref &&v) {
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bcode_unref(p_code->get_raw());
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p_code = v.p_code;
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v.p_code = nullptr;
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return *this;
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}
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/* private funcs */
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struct bcode_hdr {
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internal_state *cs; /* needed to construct the allocator */
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std::size_t asize; /* alloc size of the bytecode block */
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bcode bc; /* BC_INST_START + refcount */
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};
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/* returned address is the 'init' member of the header */
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std::uint32_t *bcode_alloc(state &cs, std::size_t sz) {
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auto a = std_allocator<std::uint32_t>{cs.p_tstate->istate};
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std::size_t hdrs = sizeof(bcode_hdr) / sizeof(std::uint32_t);
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auto p = a.allocate(sz + hdrs - 1);
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bcode_hdr *hdr = reinterpret_cast<bcode_hdr *>(p);
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hdr->cs = cs.p_tstate->istate;
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hdr->asize = sz + hdrs - 1;
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return p + hdrs - 1;
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}
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/* bc's address must be the 'init' member of the header */
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static inline void bcode_free(std::uint32_t *bc) {
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auto *rp = bc + 1 - (sizeof(bcode_hdr) / sizeof(std::uint32_t));
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bcode_hdr *hdr = reinterpret_cast<bcode_hdr *>(rp);
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std_allocator<std::uint32_t>{hdr->cs}.deallocate(rp, hdr->asize);
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}
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void bcode_incr(std::uint32_t *bc) {
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*bc += 0x100;
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}
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void bcode_decr(std::uint32_t *bc) {
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*bc -= 0x100;
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if (std::int32_t(*bc) < 0x100) {
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bcode_free(bc);
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}
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}
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void bcode_addref(std::uint32_t *code) {
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if (!code) {
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return;
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}
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if ((*code & BC_INST_OP_MASK) == BC_INST_START) {
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bcode_incr(code);
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return;
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}
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switch (code[-1]&BC_INST_OP_MASK) {
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case BC_INST_START:
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bcode_incr(&code[-1]);
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break;
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case BC_INST_OFFSET:
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code -= std::ptrdiff_t(code[-1] >> 8);
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bcode_incr(code);
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break;
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}
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}
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void bcode_unref(std::uint32_t *code) {
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if (!code) {
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return;
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}
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if ((*code & BC_INST_OP_MASK) == BC_INST_START) {
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bcode_decr(code);
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return;
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}
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switch (code[-1]&BC_INST_OP_MASK) {
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case BC_INST_START:
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bcode_decr(&code[-1]);
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break;
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case BC_INST_OFFSET:
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code -= std::ptrdiff_t(code[-1] >> 8);
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bcode_decr(code);
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break;
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}
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}
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/* empty fallbacks */
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static std::uint32_t emptyrets[VAL_ANY] = {
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BC_RET_NULL, BC_RET_INT, BC_RET_FLOAT, BC_RET_STRING
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};
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empty_block *bcode_init_empty(internal_state *cs) {
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auto a = std_allocator<empty_block>{cs};
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auto *p = a.allocate(VAL_ANY);
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for (std::size_t i = 0; i < VAL_ANY; ++i) {
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p[i].init.init = BC_INST_START + 0x100;
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p[i].code = BC_INST_EXIT | emptyrets[i];
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}
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return p;
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}
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void bcode_free_empty(internal_state *cs, empty_block *empty) {
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std_allocator<empty_block>{cs}.deallocate(empty, VAL_ANY);
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};
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bcode *bcode_get_empty(empty_block *empty, std::size_t val) {
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return &empty[val].init + 1;
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}
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} /* namespace cubescript */
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