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