137 lines
3.4 KiB
C++
137 lines
3.4 KiB
C++
#include "cs_bcode.hh"
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#include "cs_state.hh"
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namespace cscript {
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/* public API impls */
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LIBCUBESCRIPT_EXPORT cs_bcode_ref::cs_bcode_ref(cs_bcode *v): p_code(v) {
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bcode_ref(v->get_raw());
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}
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LIBCUBESCRIPT_EXPORT cs_bcode_ref::cs_bcode_ref(cs_bcode_ref const &v):
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p_code(v.p_code)
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{
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bcode_ref(p_code->get_raw());
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}
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LIBCUBESCRIPT_EXPORT cs_bcode_ref::~cs_bcode_ref() {
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bcode_unref(p_code->get_raw());
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}
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LIBCUBESCRIPT_EXPORT cs_bcode_ref &cs_bcode_ref::operator=(
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cs_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_ref(p_code->get_raw());
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return *this;
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}
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LIBCUBESCRIPT_EXPORT cs_bcode_ref &cs_bcode_ref::operator=(cs_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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cs_shared_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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cs_bcode bc; /* CS_CODE_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(cs_state &cs, std::size_t sz) {
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auto a = cs_allocator<std::uint32_t>{cs};
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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_get_sstate(cs);
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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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cs_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_ref(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 & CS_CODE_OP_MASK) == CS_CODE_START) {
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bcode_incr(code);
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return;
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}
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switch (code[-1]&CS_CODE_OP_MASK) {
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case CS_CODE_START:
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bcode_incr(&code[-1]);
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break;
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case CS_CODE_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 & CS_CODE_OP_MASK) == CS_CODE_START) {
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bcode_decr(code);
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return;
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}
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switch (code[-1]&CS_CODE_OP_MASK) {
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case CS_CODE_START:
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bcode_decr(&code[-1]);
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break;
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case CS_CODE_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[CS_VAL_ANY] = {
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CS_RET_NULL, CS_RET_INT, CS_RET_FLOAT, CS_RET_STRING
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};
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empty_block *bcode_init_empty(cs_shared_state *cs) {
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auto a = cs_allocator<empty_block>{cs};
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auto *p = a.allocate(CS_VAL_ANY);
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for (std::size_t i = 0; i < CS_VAL_ANY; ++i) {
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p[i].init.init = CS_CODE_START + 0x100;
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p[i].code = CS_CODE_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(cs_shared_state *cs, empty_block *empty) {
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cs_allocator<empty_block>{cs}.deallocate(empty, CS_VAL_ANY);
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};
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cs_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 cscript */
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