1 files changed, 391 insertions, 0 deletions

diff --git a/src/lj_crecord.c b/src/lj_crecord.c
new file mode 100644
index 00000000..b197d4b4
--- /dev/null
+++ b/src/lj_crecord.c
@@ -0,0 +1,391 @@
+/*
+** Trace recorder for C data operations.
+** Copyright (C) 2005-2010 Mike Pall. See Copyright Notice in luajit.h
+*/
+
+#define lj_ffrecord_c
+#define LUA_CORE
+
+#include "lj_obj.h"
+
+#if LJ_HASJIT && LJ_HASFFI
+
+#include "lj_err.h"
+#include "lj_str.h"
+#include "lj_ctype.h"
+#include "lj_cconv.h"
+#include "lj_ir.h"
+#include "lj_jit.h"
+#include "lj_iropt.h"
+#include "lj_trace.h"
+#include "lj_ffrecord.h"
+#include "lj_crecord.h"
+#include "lj_dispatch.h"
+
+/* Some local macros to save typing. Undef'd at the end. */
+#define IR(ref)                 (&J->cur.ir[(ref)])
+
+/* Pass IR on to next optimization in chain (FOLD). */
+#define emitir(ot, a, b)        (lj_ir_set(J, (ot), (a), (b)), lj_opt_fold(J))
+
+/* -- C type checks ------------------------------------------------------- */
+
+static GCcdata *argv2cdata(jit_State *J, TRef trcd, TValue *o)
+{
+  GCcdata *cd;
+  TRef trtypeid;
+  if (!tviscdata(o))
+    lj_trace_err(J, LJ_TRERR_BADTYPE);
+  cd = cdataV(o);
+  /* Specialize to the CTypeID. */
+  trtypeid = emitir(IRT(IR_FLOAD, IRT_U16), trcd, IRFL_CDATA_TYPEID);
+  emitir(IRTG(IR_EQ, IRT_INT), trtypeid, lj_ir_kint(J, (int32_t)cd->typeid));
+  return cd;
+}
+
+/* -- Convert C type to C type -------------------------------------------- */
+
+/*
+** This code mirrors the code in lj_cconv.c. It performs the same steps
+** for the trace recorder that lj_cconv.c does for the interpreter.
+**
+** One major difference is that we can get away with much fewer checks
+** here. E.g. checks for casts, constness or correct types can often be
+** omitted, even if they might fail. The interpreter subsequently throws
+** an error, which aborts the trace.
+**
+** All operations are specialized to their C types, so the on-trace
+** outcome must be the same as the outcome in the interpreter. If the
+** interpreter doesn't throw an error, then the trace is correct, too.
+** Care must be taken not to generate invalid (temporary) IR or to
+** trigger asserts.
+*/
+
+/* Convert CType to IRType. */
+static IRType crec_ct2irt(CType *ct)
+{
+  if (LJ_LIKELY(ctype_isnum(ct->info))) {
+    if ((ct->info & CTF_FP)) {
+      if (ct->size == sizeof(double))  /* NYI: float IRType. */
+        return IRT_NUM;
+    } else {
+      uint32_t b = lj_fls(ct->size);
+      if (b <= 3)
+        return IRT_I8 + 2*b + ((ct->info & CTF_UNSIGNED) ? 1 : 0);
+    }
+  } else if (ctype_isptr(ct->info)) {
+    return (LJ_64 && ct->size == 8) ? IRT_P64 : IRT_P32;
+  }
+  return IRT_CDATA;
+}
+
+static void crec_ct_ct(jit_State *J, CType *d, CType *s, TRef dp, TRef sp)
+{
+  CTState *cts = ctype_ctsG(J2G(J));
+  CTSize dsize = d->size, ssize = s->size;
+  CTInfo dinfo = d->info, sinfo = s->info;
+  IRType dt = crec_ct2irt(d);
+
+  if (ctype_type(dinfo) > CT_MAYCONVERT || ctype_type(sinfo) > CT_MAYCONVERT)
+    goto err_conv;
+
+  /*
+  ** Note: Unlike lj_cconv_ct_ct(), sp holds the _value_ of pointers and
+  ** numbers up to 8 bytes. Otherwise sp holds a pointer.
+  */
+
+  switch (cconv_idx2(dinfo, sinfo)) {
+  /* Destination is a bool. */
+  case CCX(B, B):
+    goto xstore;  /* Source operand is already normalized. */
+  case CCX(B, I):
+  case CCX(B, P):
+  case CCX(B, F):
+  case CCX(B, C):
+  case CCX(B, A):
+    /* NYI: specialize to the result of a comparison against 0. */
+    goto err_nyi;
+
+  /* Destination is an integer. */
+  case CCX(I, B):
+  case CCX(I, I):
+  conv_I_I:
+    lua_assert(ssize >= 4);
+    if (dsize > 8 || ssize > 8) goto err_nyi;
+    if (dsize > ssize)  /* Zero-extend or sign-extend 32 to 64 bit integer. */
+      sp = emitir(IRT(IR_TOI64, dt), sp,
+                  (sinfo&CTF_UNSIGNED) ? IRTOINT_ZEXT64 : IRTOINT_SEXT64);
+  xstore:
+    emitir(IRT(IR_XSTORE, dt), dp, sp);
+    break;
+  case CCX(I, F):
+  conv_I_F:
+    if (dsize > 8 || ssize != sizeof(double)) goto err_nyi;
+    if (dsize == 8) {
+      if (dt == IRT_U64) goto err_nyi;
+      sp = emitir(IRT(IR_TOI64, dt), sp, IRTOINT_TRUNCI64);
+    } else {
+      sp = emitir(IRTI(IR_TOINT), sp, IRTOINT_ANY);  /* NYI: should truncate. */
+    }
+    goto xstore;
+  case CCX(I, C):
+    if (ssize != 2*sizeof(double)) goto err_nyi;
+    sp = emitir(IRT(IR_XLOAD, IRT_NUM), sp, 0);  /* Load re. */
+    s = ctype_child(cts, s);
+    sinfo = s->info;
+    ssize = s->size;
+    goto conv_I_F;  /* Just convert re. */
+  case CCX(I, P):
+  case CCX(I, A):
+    sinfo = CTINFO(CT_NUM, CTF_UNSIGNED);
+    ssize = CTSIZE_PTR;
+    /*
+    ** Note: Overriding the size is also required for pointers, since
+    ** crec_ct_tv passes IRT_P32/IRT_P64 independently of the C type size.
+    ** This avoids unnecessary zero-extensions on x64.
+    */
+    goto conv_I_I;
+
+  /* Destination is a floating-point number. */
+  case CCX(F, B):
+  case CCX(F, I):
+  conv_F_I:
+    if (dsize != sizeof(double) || ssize > 4) goto err_nyi;
+    if (ssize == 4 && (sinfo & CTF_UNSIGNED)) goto err_nyi;
+    sp = emitir(IRTI(IR_TONUM), sp, 0);
+    goto xstore;
+  case CCX(F, F):
+  conv_F_F:
+    if (dsize != sizeof(double) || ssize != sizeof(double)) goto err_nyi;
+    goto xstore;
+  case CCX(F, C):
+    if (ssize != 2*sizeof(double)) goto err_nyi;
+    sp = emitir(IRT(IR_XLOAD, IRT_NUM), sp, 0);  /* Load re. */
+    s = ctype_child(cts, s);
+    sinfo = s->info;
+    ssize = s->size;
+    goto conv_F_F;  /* Ignore im, and convert from re. */
+
+  /* Destination is a complex number. */
+  case CCX(C, I):
+  case CCX(C, F):
+    d = ctype_child(cts, d);
+    dinfo = d->info;
+    dsize = d->size;
+    if (dsize != sizeof(double)) goto err_nyi;
+    {  /* Clear im. */
+      TRef dpim = emitir(IRT(IR_ADD, IRT_PTR), dp, lj_ir_kintp(J, dsize));
+      emitir(IRT(IR_XSTORE, IRT_NUM), dpim, lj_ir_knum(J, 0));
+    }
+    /* Convert to re. */
+    if ((sinfo & CTF_FP)) goto conv_F_F; else goto conv_F_I;
+
+  case CCX(C, C):
+    d = ctype_child(cts, d);
+    dinfo = d->info;
+    dsize = d->size;
+    if (dsize != sizeof(double)) goto err_nyi;
+    {
+      TRef spim = emitir(IRT(IR_ADD, IRT_PTR), sp, lj_ir_kintp(J, dsize));
+      TRef re = emitir(IRT(IR_XLOAD, IRT_NUM), sp, 0);
+      TRef im = emitir(IRT(IR_XLOAD, IRT_NUM), spim, 0);
+      TRef dpim = emitir(IRT(IR_ADD, IRT_PTR), dp, lj_ir_kintp(J, dsize));
+      emitir(IRT(IR_XSTORE, IRT_NUM), dp, re);
+      emitir(IRT(IR_XSTORE, IRT_NUM), dpim, im);
+    }
+    break;
+
+  /* Destination is a vector. */
+  case CCX(V, I):
+  case CCX(V, F):
+  case CCX(V, C):
+  case CCX(V, V):
+    goto err_nyi;
+
+  /* Destination is a pointer. */
+  case CCX(P, P):
+    /* Note: ok on x64, since all 32 bit ops clear the upper part of the reg. */
+    goto xstore;
+  case CCX(P, A):
+  case CCX(P, S):
+    ssize = CTSIZE_PTR;
+    sinfo = CTINFO(CT_NUM, CTF_UNSIGNED);
+    /* fallthrough */
+  case CCX(P, I):
+    dinfo = CTINFO(CT_NUM, CTF_UNSIGNED);
+    goto conv_I_I;
+  case CCX(P, F):
+    dinfo = CTINFO(CT_NUM, CTF_UNSIGNED);
+    goto conv_I_F;
+
+  /* Destination is an array. */
+  case CCX(A, A):
+    goto err_nyi;
+
+  /* Destination is a struct/union. */
+  case CCX(S, S):
+    goto err_nyi;
+
+  default:
+  err_conv:
+  err_nyi:
+    lj_trace_err(J, LJ_TRERR_NYICONV);
+    break;
+  }
+}
+
+/* -- Convert C type to TValue (load) ------------------------------------- */
+
+static TRef crec_tv_ct(jit_State *J, CType *s, CTypeID sid, TRef sp)
+{
+  CTInfo sinfo = s->info;
+  lua_assert(!ctype_isenum(sinfo));
+  if (ctype_isnum(sinfo)) {
+    IRType t = crec_ct2irt(s);
+    if ((sinfo & CTF_BOOL))
+      lj_trace_err(J, LJ_TRERR_NYICONV);  /* NYI: specialize to the result. */
+    if (t == IRT_CDATA) goto copyval;
+    if (t == IRT_U32) lj_trace_err(J, LJ_TRERR_NYICONV);
+    return emitir(IRT(IR_XLOAD, t), sp, 0);
+  } else if (ctype_isrefarray(sinfo) || ctype_isstruct(sinfo)) {
+    /* Create reference. */
+    UNUSED(sid); lj_trace_err(J, LJ_TRERR_NYICONV);
+    return 0;
+  } else {
+  copyval:  /* Copy value. */
+    lj_trace_err(J, LJ_TRERR_NYICONV);
+    return 0;
+  }
+}
+
+/* -- Convert TValue to C type (store) ------------------------------------ */
+
+static void crec_ct_tv(jit_State *J, CType *d, TRef dp, TRef sp, TValue *sval)
+{
+  CTState *cts = ctype_ctsG(J2G(J));
+  CTypeID sid = CTID_P_VOID;
+  CType *s;
+  if (LJ_LIKELY(tref_isinteger(sp))) {
+    sid = CTID_INT32;
+  } else if (tref_isnum(sp)) {
+    sid = CTID_DOUBLE;
+  } else if (tref_isbool(sp)) {
+    sp = lj_ir_kint(J, tref_istrue(sp) ? 1 : 0);
+    sid = CTID_BOOL;
+  } else if (tref_isnil(sp)) {
+    sp = lj_ir_knull(J, IRT_PTR);
+  } else if (tref_isudata(sp)) {
+    sp = emitir(IRT(IR_ADD, IRT_P32), sp, lj_ir_kint(J, sizeof(GCcdata)));
+  } else {  /* NYI: tref_isstr(sp), tref_istab(sp), tref_islightud(sp). */
+    sid = argv2cdata(J, sp, sval)->typeid;
+    s = ctype_raw(cts, sid);
+    if (ctype_isptr(s->info)) {
+      IRType t = (LJ_64 && s->size == 8) ? IRT_P64 : IRT_P32;
+      sp = emitir(IRT(IR_FLOAD, t), sp, IRFL_CDATA_DATA);
+      if (ctype_isref(s->info))
+        s = ctype_rawchild(cts, s);
+      else
+        goto doconv;  /* The pointer value was loaded, don't load number. */
+    } else {
+      sp = emitir(IRT(IR_ADD, IRT_P32), sp, lj_ir_kint(J, sizeof(GCcdata)));
+    }
+    if (ctype_isenum(s->info)) s = ctype_child(cts, s);
+    if (ctype_isnum(s->info)) {  /* Load number value. */
+      IRType t = crec_ct2irt(s);
+      if (t != IRT_CDATA) sp = emitir(IRT(IR_XLOAD, t), sp, 0);
+    }
+    goto doconv;
+  }
+  s = ctype_get(cts, sid);
+doconv:
+  crec_ct_ct(J, d, s, dp, sp);
+}
+
+/* -- C data metamethods -------------------------------------------------- */
+
+void LJ_FASTCALL recff_cdata_index(jit_State *J, RecordFFData *rd)
+{
+  TRef idx, ptr = J->base[0];
+  ptrdiff_t ofs = sizeof(GCcdata);
+  GCcdata *cd = argv2cdata(J, ptr, &rd->argv[0]);
+  CTState *cts = ctype_ctsG(J2G(J));
+  CType *ct = ctype_raw(cts, cd->typeid);
+  CTypeID sid = 0;
+
+  /* Resolve pointer or reference for cdata object. */
+  if (ctype_isptr(ct->info)) {
+    IRType t = (LJ_64 && ct->size == 8) ? IRT_P64 : IRT_P32;
+    if (ctype_isref(ct->info)) ct = ctype_rawchild(cts, ct);
+    ptr = emitir(IRT(IR_FLOAD, t), ptr, IRFL_CDATA_DATA);
+    ofs = 0;
+  }
+
+  idx = J->base[1];
+  if (tref_isnumber(idx)) {
+    /* The size of a ptrdiff_t is target-specific. */
+#if LJ_64
+    idx = emitir(IRT(IR_TOI64, IRT_INTP), idx,
+                 tref_isinteger(idx) ? IRTOINT_SEXT64 : IRTOINT_TRUNCI64);
+#else
+    if (!tref_isinteger(idx))
+      idx = emitir(IRT(IR_TOINT, IRT_INTP), idx, IRTOINT_ANY);
+#endif
+    if (ctype_ispointer(ct->info)) {
+      sid = ctype_cid(ct->info);
+      idx = emitir(IRT(IR_MUL, IRT_INTP), idx,
+                   lj_ir_kintp(J, lj_ctype_size(cts, sid)));
+      ptr = emitir(IRT(IR_ADD, IRT_PTR), idx, ptr);
+    }
+  } else if (tref_isstr(idx)) {
+    GCstr *name = strV(&rd->argv[1]);
+    if (ctype_isstruct(ct->info)) {
+      CTSize fofs;
+      CType *fct = lj_ctype_getfield(cts, ct, name, &fofs);
+      if (fct) {
+        if (ctype_isconstval(fct->info)) {
+          if (fct->size >= 0x80000000u &&
+              (ctype_child(cts, fct)->info & CTF_UNSIGNED)) {
+            J->base[0] = lj_ir_knum(J, (lua_Number)(uint32_t)fct->size);
+            return;
+          }
+          J->base[0] = lj_ir_kint(J, (int32_t)fct->size);
+          return;  /* Interpreter will throw for newindex. */
+        } else if (ctype_isbitfield(fct->info)) {
+          lj_trace_err(J, LJ_TRERR_NYICONV);
+        } else {
+          lua_assert(ctype_isfield(fct->info));
+          sid = ctype_cid(fct->info);
+        }
+        ofs += (ptrdiff_t)fofs;
+      }
+    } else if (ctype_iscomplex(ct->info)) {
+      if (strdata(name)[0] == 'i') ofs += (ct->size >> 1);
+      sid = ctype_cid(ct->info);
+    }
+  }
+  if (!sid) lj_trace_err(J, LJ_TRERR_BADTYPE);
+
+  if (ofs)
+    ptr = emitir(IRT(IR_ADD, IRT_PTR), ptr, lj_ir_kintp(J, ofs));
+
+  /* Resolve reference for field. */
+  ct = ctype_get(cts, sid);
+  if (ctype_isref(ct->info))
+    ptr = emitir(IRT(IR_XLOAD, IRT_PTR), ptr, 0);
+
+  /* Skip attributes and enums. */
+  while (ctype_isattrib(ct->info) || ctype_isenum(ct->info))
+    ct = ctype_child(cts, ct);
+
+  if (rd->data == 0) {  /* __index metamethod. */
+    J->base[0] = crec_tv_ct(J, ct, sid, ptr);
+  } else {  /* __newindex metamethod. */
+    rd->nres = 0;
+    crec_ct_tv(J, ct, ptr, J->base[2], &rd->argv[2]);
+  }
+}
+
+#undef IR
+#undef emitir
+
+#endif