From dc2493e7525bb7633f697ef10f72b72b46222249 Mon Sep 17 00:00:00 2001
From: Andy Belle-Isle <drumsetmonkey@gmail.com>
Date: Fri, 30 Aug 2019 00:45:36 -0400
Subject: Forget what I said, I just need to change git attributes to mark for
vendor
---
lib/LuaJIT/src/lj_bcwrite.c | 361 ++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 361 insertions(+)
create mode 100644 lib/LuaJIT/src/lj_bcwrite.c
(limited to 'lib/LuaJIT/src/lj_bcwrite.c')
diff --git a/lib/LuaJIT/src/lj_bcwrite.c b/lib/LuaJIT/src/lj_bcwrite.c
new file mode 100644
index 0000000..5e05cae
--- /dev/null
+++ b/lib/LuaJIT/src/lj_bcwrite.c
@@ -0,0 +1,361 @@
+/*
+** Bytecode writer.
+** Copyright (C) 2005-2017 Mike Pall. See Copyright Notice in luajit.h
+*/
+
+#define lj_bcwrite_c
+#define LUA_CORE
+
+#include "lj_obj.h"
+#include "lj_gc.h"
+#include "lj_buf.h"
+#include "lj_bc.h"
+#if LJ_HASFFI
+#include "lj_ctype.h"
+#endif
+#if LJ_HASJIT
+#include "lj_dispatch.h"
+#include "lj_jit.h"
+#endif
+#include "lj_strfmt.h"
+#include "lj_bcdump.h"
+#include "lj_vm.h"
+
+/* Context for bytecode writer. */
+typedef struct BCWriteCtx {
+ SBuf sb; /* Output buffer. */
+ GCproto *pt; /* Root prototype. */
+ lua_Writer wfunc; /* Writer callback. */
+ void *wdata; /* Writer callback data. */
+ int strip; /* Strip debug info. */
+ int status; /* Status from writer callback. */
+} BCWriteCtx;
+
+/* -- Bytecode writer ----------------------------------------------------- */
+
+/* Write a single constant key/value of a template table. */
+static void bcwrite_ktabk(BCWriteCtx *ctx, cTValue *o, int narrow)
+{
+ char *p = lj_buf_more(&ctx->sb, 1+10);
+ if (tvisstr(o)) {
+ const GCstr *str = strV(o);
+ MSize len = str->len;
+ p = lj_buf_more(&ctx->sb, 5+len);
+ p = lj_strfmt_wuleb128(p, BCDUMP_KTAB_STR+len);
+ p = lj_buf_wmem(p, strdata(str), len);
+ } else if (tvisint(o)) {
+ *p++ = BCDUMP_KTAB_INT;
+ p = lj_strfmt_wuleb128(p, intV(o));
+ } else if (tvisnum(o)) {
+ if (!LJ_DUALNUM && narrow) { /* Narrow number constants to integers. */
+ lua_Number num = numV(o);
+ int32_t k = lj_num2int(num);
+ if (num == (lua_Number)k) { /* -0 is never a constant. */
+ *p++ = BCDUMP_KTAB_INT;
+ p = lj_strfmt_wuleb128(p, k);
+ setsbufP(&ctx->sb, p);
+ return;
+ }
+ }
+ *p++ = BCDUMP_KTAB_NUM;
+ p = lj_strfmt_wuleb128(p, o->u32.lo);
+ p = lj_strfmt_wuleb128(p, o->u32.hi);
+ } else {
+ lua_assert(tvispri(o));
+ *p++ = BCDUMP_KTAB_NIL+~itype(o);
+ }
+ setsbufP(&ctx->sb, p);
+}
+
+/* Write a template table. */
+static void bcwrite_ktab(BCWriteCtx *ctx, char *p, const GCtab *t)
+{
+ MSize narray = 0, nhash = 0;
+ if (t->asize > 0) { /* Determine max. length of array part. */
+ ptrdiff_t i;
+ TValue *array = tvref(t->array);
+ for (i = (ptrdiff_t)t->asize-1; i >= 0; i--)
+ if (!tvisnil(&array[i]))
+ break;
+ narray = (MSize)(i+1);
+ }
+ if (t->hmask > 0) { /* Count number of used hash slots. */
+ MSize i, hmask = t->hmask;
+ Node *node = noderef(t->node);
+ for (i = 0; i <= hmask; i++)
+ nhash += !tvisnil(&node[i].val);
+ }
+ /* Write number of array slots and hash slots. */
+ p = lj_strfmt_wuleb128(p, narray);
+ p = lj_strfmt_wuleb128(p, nhash);
+ setsbufP(&ctx->sb, p);
+ if (narray) { /* Write array entries (may contain nil). */
+ MSize i;
+ TValue *o = tvref(t->array);
+ for (i = 0; i < narray; i++, o++)
+ bcwrite_ktabk(ctx, o, 1);
+ }
+ if (nhash) { /* Write hash entries. */
+ MSize i = nhash;
+ Node *node = noderef(t->node) + t->hmask;
+ for (;; node--)
+ if (!tvisnil(&node->val)) {
+ bcwrite_ktabk(ctx, &node->key, 0);
+ bcwrite_ktabk(ctx, &node->val, 1);
+ if (--i == 0) break;
+ }
+ }
+}
+
+/* Write GC constants of a prototype. */
+static void bcwrite_kgc(BCWriteCtx *ctx, GCproto *pt)
+{
+ MSize i, sizekgc = pt->sizekgc;
+ GCRef *kr = mref(pt->k, GCRef) - (ptrdiff_t)sizekgc;
+ for (i = 0; i < sizekgc; i++, kr++) {
+ GCobj *o = gcref(*kr);
+ MSize tp, need = 1;
+ char *p;
+ /* Determine constant type and needed size. */
+ if (o->gch.gct == ~LJ_TSTR) {
+ tp = BCDUMP_KGC_STR + gco2str(o)->len;
+ need = 5+gco2str(o)->len;
+ } else if (o->gch.gct == ~LJ_TPROTO) {
+ lua_assert((pt->flags & PROTO_CHILD));
+ tp = BCDUMP_KGC_CHILD;
+#if LJ_HASFFI
+ } else if (o->gch.gct == ~LJ_TCDATA) {
+ CTypeID id = gco2cd(o)->ctypeid;
+ need = 1+4*5;
+ if (id == CTID_INT64) {
+ tp = BCDUMP_KGC_I64;
+ } else if (id == CTID_UINT64) {
+ tp = BCDUMP_KGC_U64;
+ } else {
+ lua_assert(id == CTID_COMPLEX_DOUBLE);
+ tp = BCDUMP_KGC_COMPLEX;
+ }
+#endif
+ } else {
+ lua_assert(o->gch.gct == ~LJ_TTAB);
+ tp = BCDUMP_KGC_TAB;
+ need = 1+2*5;
+ }
+ /* Write constant type. */
+ p = lj_buf_more(&ctx->sb, need);
+ p = lj_strfmt_wuleb128(p, tp);
+ /* Write constant data (if any). */
+ if (tp >= BCDUMP_KGC_STR) {
+ p = lj_buf_wmem(p, strdata(gco2str(o)), gco2str(o)->len);
+ } else if (tp == BCDUMP_KGC_TAB) {
+ bcwrite_ktab(ctx, p, gco2tab(o));
+ continue;
+#if LJ_HASFFI
+ } else if (tp != BCDUMP_KGC_CHILD) {
+ cTValue *q = (TValue *)cdataptr(gco2cd(o));
+ p = lj_strfmt_wuleb128(p, q[0].u32.lo);
+ p = lj_strfmt_wuleb128(p, q[0].u32.hi);
+ if (tp == BCDUMP_KGC_COMPLEX) {
+ p = lj_strfmt_wuleb128(p, q[1].u32.lo);
+ p = lj_strfmt_wuleb128(p, q[1].u32.hi);
+ }
+#endif
+ }
+ setsbufP(&ctx->sb, p);
+ }
+}
+
+/* Write number constants of a prototype. */
+static void bcwrite_knum(BCWriteCtx *ctx, GCproto *pt)
+{
+ MSize i, sizekn = pt->sizekn;
+ cTValue *o = mref(pt->k, TValue);
+ char *p = lj_buf_more(&ctx->sb, 10*sizekn);
+ for (i = 0; i < sizekn; i++, o++) {
+ int32_t k;
+ if (tvisint(o)) {
+ k = intV(o);
+ goto save_int;
+ } else {
+ /* Write a 33 bit ULEB128 for the int (lsb=0) or loword (lsb=1). */
+ if (!LJ_DUALNUM) { /* Narrow number constants to integers. */
+ lua_Number num = numV(o);
+ k = lj_num2int(num);
+ if (num == (lua_Number)k) { /* -0 is never a constant. */
+ save_int:
+ p = lj_strfmt_wuleb128(p, 2*(uint32_t)k | ((uint32_t)k&0x80000000u));
+ if (k < 0)
+ p[-1] = (p[-1] & 7) | ((k>>27) & 0x18);
+ continue;
+ }
+ }
+ p = lj_strfmt_wuleb128(p, 1+(2*o->u32.lo | (o->u32.lo & 0x80000000u)));
+ if (o->u32.lo >= 0x80000000u)
+ p[-1] = (p[-1] & 7) | ((o->u32.lo>>27) & 0x18);
+ p = lj_strfmt_wuleb128(p, o->u32.hi);
+ }
+ }
+ setsbufP(&ctx->sb, p);
+}
+
+/* Write bytecode instructions. */
+static char *bcwrite_bytecode(BCWriteCtx *ctx, char *p, GCproto *pt)
+{
+ MSize nbc = pt->sizebc-1; /* Omit the [JI]FUNC* header. */
+#if LJ_HASJIT
+ uint8_t *q = (uint8_t *)p;
+#endif
+ p = lj_buf_wmem(p, proto_bc(pt)+1, nbc*(MSize)sizeof(BCIns));
+ UNUSED(ctx);
+#if LJ_HASJIT
+ /* Unpatch modified bytecode containing ILOOP/JLOOP etc. */
+ if ((pt->flags & PROTO_ILOOP) || pt->trace) {
+ jit_State *J = L2J(sbufL(&ctx->sb));
+ MSize i;
+ for (i = 0; i < nbc; i++, q += sizeof(BCIns)) {
+ BCOp op = (BCOp)q[LJ_ENDIAN_SELECT(0, 3)];
+ if (op == BC_IFORL || op == BC_IITERL || op == BC_ILOOP ||
+ op == BC_JFORI) {
+ q[LJ_ENDIAN_SELECT(0, 3)] = (uint8_t)(op-BC_IFORL+BC_FORL);
+ } else if (op == BC_JFORL || op == BC_JITERL || op == BC_JLOOP) {
+ BCReg rd = q[LJ_ENDIAN_SELECT(2, 1)] + (q[LJ_ENDIAN_SELECT(3, 0)] << 8);
+ BCIns ins = traceref(J, rd)->startins;
+ q[LJ_ENDIAN_SELECT(0, 3)] = (uint8_t)(op-BC_JFORL+BC_FORL);
+ q[LJ_ENDIAN_SELECT(2, 1)] = bc_c(ins);
+ q[LJ_ENDIAN_SELECT(3, 0)] = bc_b(ins);
+ }
+ }
+ }
+#endif
+ return p;
+}
+
+/* Write prototype. */
+static void bcwrite_proto(BCWriteCtx *ctx, GCproto *pt)
+{
+ MSize sizedbg = 0;
+ char *p;
+
+ /* Recursively write children of prototype. */
+ if ((pt->flags & PROTO_CHILD)) {
+ ptrdiff_t i, n = pt->sizekgc;
+ GCRef *kr = mref(pt->k, GCRef) - 1;
+ for (i = 0; i < n; i++, kr--) {
+ GCobj *o = gcref(*kr);
+ if (o->gch.gct == ~LJ_TPROTO)
+ bcwrite_proto(ctx, gco2pt(o));
+ }
+ }
+
+ /* Start writing the prototype info to a buffer. */
+ p = lj_buf_need(&ctx->sb,
+ 5+4+6*5+(pt->sizebc-1)*(MSize)sizeof(BCIns)+pt->sizeuv*2);
+ p += 5; /* Leave room for final size. */
+
+ /* Write prototype header. */
+ *p++ = (pt->flags & (PROTO_CHILD|PROTO_VARARG|PROTO_FFI));
+ *p++ = pt->numparams;
+ *p++ = pt->framesize;
+ *p++ = pt->sizeuv;
+ p = lj_strfmt_wuleb128(p, pt->sizekgc);
+ p = lj_strfmt_wuleb128(p, pt->sizekn);
+ p = lj_strfmt_wuleb128(p, pt->sizebc-1);
+ if (!ctx->strip) {
+ if (proto_lineinfo(pt))
+ sizedbg = pt->sizept - (MSize)((char *)proto_lineinfo(pt) - (char *)pt);
+ p = lj_strfmt_wuleb128(p, sizedbg);
+ if (sizedbg) {
+ p = lj_strfmt_wuleb128(p, pt->firstline);
+ p = lj_strfmt_wuleb128(p, pt->numline);
+ }
+ }
+
+ /* Write bytecode instructions and upvalue refs. */
+ p = bcwrite_bytecode(ctx, p, pt);
+ p = lj_buf_wmem(p, proto_uv(pt), pt->sizeuv*2);
+ setsbufP(&ctx->sb, p);
+
+ /* Write constants. */
+ bcwrite_kgc(ctx, pt);
+ bcwrite_knum(ctx, pt);
+
+ /* Write debug info, if not stripped. */
+ if (sizedbg) {
+ p = lj_buf_more(&ctx->sb, sizedbg);
+ p = lj_buf_wmem(p, proto_lineinfo(pt), sizedbg);
+ setsbufP(&ctx->sb, p);
+ }
+
+ /* Pass buffer to writer function. */
+ if (ctx->status == 0) {
+ MSize n = sbuflen(&ctx->sb) - 5;
+ MSize nn = (lj_fls(n)+8)*9 >> 6;
+ char *q = sbufB(&ctx->sb) + (5 - nn);
+ p = lj_strfmt_wuleb128(q, n); /* Fill in final size. */
+ lua_assert(p == sbufB(&ctx->sb) + 5);
+ ctx->status = ctx->wfunc(sbufL(&ctx->sb), q, nn+n, ctx->wdata);
+ }
+}
+
+/* Write header of bytecode dump. */
+static void bcwrite_header(BCWriteCtx *ctx)
+{
+ GCstr *chunkname = proto_chunkname(ctx->pt);
+ const char *name = strdata(chunkname);
+ MSize len = chunkname->len;
+ char *p = lj_buf_need(&ctx->sb, 5+5+len);
+ *p++ = BCDUMP_HEAD1;
+ *p++ = BCDUMP_HEAD2;
+ *p++ = BCDUMP_HEAD3;
+ *p++ = BCDUMP_VERSION;
+ *p++ = (ctx->strip ? BCDUMP_F_STRIP : 0) +
+ LJ_BE*BCDUMP_F_BE +
+ ((ctx->pt->flags & PROTO_FFI) ? BCDUMP_F_FFI : 0) +
+ LJ_FR2*BCDUMP_F_FR2;
+ if (!ctx->strip) {
+ p = lj_strfmt_wuleb128(p, len);
+ p = lj_buf_wmem(p, name, len);
+ }
+ ctx->status = ctx->wfunc(sbufL(&ctx->sb), sbufB(&ctx->sb),
+ (MSize)(p - sbufB(&ctx->sb)), ctx->wdata);
+}
+
+/* Write footer of bytecode dump. */
+static void bcwrite_footer(BCWriteCtx *ctx)
+{
+ if (ctx->status == 0) {
+ uint8_t zero = 0;
+ ctx->status = ctx->wfunc(sbufL(&ctx->sb), &zero, 1, ctx->wdata);
+ }
+}
+
+/* Protected callback for bytecode writer. */
+static TValue *cpwriter(lua_State *L, lua_CFunction dummy, void *ud)
+{
+ BCWriteCtx *ctx = (BCWriteCtx *)ud;
+ UNUSED(L); UNUSED(dummy);
+ lj_buf_need(&ctx->sb, 1024); /* Avoids resize for most prototypes. */
+ bcwrite_header(ctx);
+ bcwrite_proto(ctx, ctx->pt);
+ bcwrite_footer(ctx);
+ return NULL;
+}
+
+/* Write bytecode for a prototype. */
+int lj_bcwrite(lua_State *L, GCproto *pt, lua_Writer writer, void *data,
+ int strip)
+{
+ BCWriteCtx ctx;
+ int status;
+ ctx.pt = pt;
+ ctx.wfunc = writer;
+ ctx.wdata = data;
+ ctx.strip = strip;
+ ctx.status = 0;
+ lj_buf_init(L, &ctx.sb);
+ status = lj_vm_cpcall(L, NULL, &ctx, cpwriter);
+ if (status == 0) status = ctx.status;
+ lj_buf_free(G(sbufL(&ctx.sb)), &ctx.sb);
+ return status;
+}
+
--
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