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tnt_translate.c
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/*--------------------------------------------------------------------*/
/*--- Instrument IR to propagate taint. tnt_translate.c ---*/
/*--------------------------------------------------------------------*/
/*
This file is part of Taintgrind, the taint analysis Valgrind tool.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307, USA.
The GNU General Public License is contained in the file COPYING.
*/
#include "pub_tool_basics.h"
#include "pub_tool_hashtable.h" // For tnt_include.h, VgHashtable
#include "pub_tool_libcassert.h" // tl_assert
#include "pub_tool_libcbase.h" // VG_STREQN, VG_(memset), VG_(random)
#include "pub_tool_libcprint.h" // VG_(message), VG_(printf)
#include "pub_tool_machine.h" // VG_(fnptr_to_fnentry)
#include "pub_tool_mallocfree.h" // VG_(malloc), VG_(free)
//#include "pub_tool_options.h" // VG_STR/BHEX/BINT_CLO
#include "pub_tool_replacemalloc.h" // 0
#include "pub_tool_stacktrace.h" // VG_get_StackTrace
#include "pub_tool_tooliface.h"
#include "pub_tool_xarray.h" // VG_(sizeXA), VG_(newXA), VG_(addtoXA)
#include "tnt_include.h"
//#include "tnt_strings.h"
#include "copy.h"
/*------------------------------------------------------------*/
/*--- Forward decls ---*/
/*------------------------------------------------------------*/
struct _MCEnv;
static IRType shadowTypeV ( IRType ty );
// Taintgrind: Primarily used by do_shadow_WRTMP
static IRExpr* expr2vbits ( struct _MCEnv* mce, IRExpr* e );
// Taintgrind: Same as expr2vbits, except only for Iex_RdTmp's and Iex_Const's,
// Used by all functions except do_shadow_WRTMP
static IRExpr* atom2vbits ( struct _MCEnv* mce, IRExpr* e );
//static IRTemp findShadowTmpB ( struct _MCEnv* mce, IRTemp orig );
static IRExpr *i128_const_zero(void);
// Taintgrind: count the number of BBs read. For turning on/off instrumentation
Int numBBs = 0;
// Kilo-BBs
Int numKBBs = 0;
/* Carries info about a particular tmp. The tmp's number is not
recorded, as this is implied by (equal to) its index in the tmpMap
in MCEnv. The tmp's type is also not recorded, as this is present
in MCEnv.sb->tyenv.
When .kind is Orig, .shadowV and .shadowB may give the identities
of the temps currently holding the associated definedness (shadowV)
and origin (shadowB) values, or these may be IRTemp_INVALID if code
to compute such values has not yet been emitted.
When .kind is VSh or BSh then the tmp is holds a V- or B- value,
and so .shadowV and .shadowB must be IRTemp_INVALID, since it is
illogical for a shadow tmp itself to be shadowed.
*/
typedef
enum { Orig=1, VSh=2 } //, BSh=3 } Not doing origin tracking
TempKind;
typedef
struct {
TempKind kind;
IRTemp shadowV;
// IRTemp shadowB; Not doing origin tracking
}
TempMapEnt;
/* Carries around state during instrumentation. */
typedef
struct _MCEnv {
/* MODIFIED: the superblock being constructed. IRStmts are
added. */
IRSB* sb;
Bool trace;
/* MODIFIED: a table [0 .. #temps_in_sb-1] which gives the
current kind and possibly shadow temps for each temp in the
IRSB being constructed. Note that it does not contain the
type of each tmp. If you want to know the type, look at the
relevant entry in sb->tyenv. It follows that at all times
during the instrumentation process, the valid indices for
tmpMap and sb->tyenv are identical, being 0 .. N-1 where N is
total number of Orig, V- and B- temps allocated so far.
The reason for this strange split (types in one place, all
other info in another) is that we need the types to be
attached to sb so as to make it possible to do
"typeOfIRExpr(mce->bb->tyenv, ...)" at various places in the
instrumentation process. */
XArray* /* of TempMapEnt */ tmpMap;
/* MODIFIED: indicates whether "bogus" literals have so far been
found. Starts off False, and may change to True. */
Bool bogusLiterals;
/* READONLY: indicates whether we should use expensive
interpretations of integer adds, since unfortunately LLVM
uses them to do ORs in some circumstances. Defaulted to True
on MacOS and False everywhere else. */
Bool useLLVMworkarounds;
/* READONLY: the guest layout. This indicates which parts of
the guest state should be regarded as 'always defined'. */
const VexGuestLayout* layout;
/* READONLY: the host word type. Needed for constructing
arguments of type 'HWord' to be passed to helper functions.
Ity_I32 or Ity_I64 only. */
IRType hWordTy;
}
MCEnv;
/* SHADOW TMP MANAGEMENT. */
/* Create a new IRTemp of type 'ty' and kind 'kind', and add it to
both the table in mce->sb and to our auxiliary mapping. Note that
newTemp may cause mce->tmpMap to resize, hence previous results
from VG_(indexXA)(mce->tmpMap) are invalidated. */
static IRTemp newTemp ( MCEnv* mce, IRType ty, TempKind kind )
{
Word newIx;
TempMapEnt ent;
IRTemp tmp = newIRTemp(mce->sb->tyenv, ty);
ent.kind = kind;
ent.shadowV = IRTemp_INVALID;
// ent.shadowB = IRTemp_INVALID;
newIx = VG_(addToXA)( mce->tmpMap, &ent );
tl_assert(newIx == (Word)tmp);
return tmp;
}
/* Find the tmp currently shadowing the given original tmp. If none
so far exists, allocate one. */
static IRTemp findShadowTmpV ( MCEnv* mce, IRTemp orig )
{
TempMapEnt* ent;
/* VG_(indexXA) range-checks 'orig', hence no need to check
here. */
ent = (TempMapEnt*)VG_(indexXA)( mce->tmpMap, (Word)orig );
tl_assert(ent->kind == Orig);
if (ent->shadowV == IRTemp_INVALID) {
IRTemp tmpV
= newTemp( mce, shadowTypeV(mce->sb->tyenv->types[orig]), VSh );
/* newTemp may cause mce->tmpMap to resize, hence previous results
from VG_(indexXA) are invalid. */
ent = (TempMapEnt*)VG_(indexXA)( mce->tmpMap, (Word)orig );
tl_assert(ent->kind == Orig);
tl_assert(ent->shadowV == IRTemp_INVALID);
ent->shadowV = tmpV;
}
return ent->shadowV;
}
/* Allocate a new shadow for the given original tmp. This means any
previous shadow is abandoned. This is needed because it is
necessary to give a new value to a shadow once it has been tested
for undefinedness, but unfortunately IR's SSA property disallows
this. Instead we must abandon the old shadow, allocate a new one
and use that instead.
This is the same as findShadowTmpV, except we don't bother to see
if a shadow temp already existed -- we simply allocate a new one
regardless. */
//static void newShadowTmpV ( MCEnv* mce, IRTemp orig )
//{
// TempMapEnt* ent;
/* VG_(indexXA) range-checks 'orig', hence no need to check
here. */
// ent = (TempMapEnt*)VG_(indexXA)( mce->tmpMap, (Word)orig );
// tl_assert(ent->kind == Orig);
// if (1) {
// IRTemp tmpV
// = newTemp( mce, shadowTypeV(mce->sb->tyenv->types[orig]), VSh );
/* newTemp may cause mce->tmpMap to resize, hence previous results
from VG_(indexXA) are invalid. */
// ent = (TempMapEnt*)VG_(indexXA)( mce->tmpMap, (Word)orig );
// tl_assert(ent->kind == Orig);
// ent->shadowV = tmpV;
// }
//}
/*------------------------------------------------------------*/
/*--- IRAtoms -- a subset of IRExprs ---*/
/*------------------------------------------------------------*/
/* An atom is either an IRExpr_Const or an IRExpr_Tmp, as defined by
isIRAtom() in libvex_ir.h. Because this instrumenter expects flat
input, most of this code deals in atoms. Usefully, a value atom
always has a V-value which is also an atom: constants are shadowed
by constants, and temps are shadowed by the corresponding shadow
temporary. */
typedef IRExpr IRAtom;
/* (used for sanity checks only): is this an atom which looks
like it's from original code? */
static Bool isOriginalAtom ( MCEnv* mce, IRAtom* a1 )
{
if (a1->tag == Iex_Const)
return True;
if (a1->tag == Iex_RdTmp) {
TempMapEnt* ent = VG_(indexXA)( mce->tmpMap, a1->Iex.RdTmp.tmp );
return ent->kind == Orig;
}
return False;
}
/* (used for sanity checks only): is this an atom which looks
like it's from shadow code? */
static Bool isShadowAtom ( MCEnv* mce, IRAtom* a1 )
{
if (a1->tag == Iex_Const)
return True;
if (a1->tag == Iex_RdTmp) {
TempMapEnt* ent = VG_(indexXA)( mce->tmpMap, a1->Iex.RdTmp.tmp );
return ent->kind == VSh; // || ent->kind == BSh;
}
return False;
}
/* (used for sanity checks only): check that both args are atoms and
are identically-kinded. */
static Bool sameKindedAtoms ( IRAtom* a1, IRAtom* a2 )
{
if (a1->tag == Iex_RdTmp && a2->tag == Iex_RdTmp)
return True;
if (a1->tag == Iex_Const && a2->tag == Iex_Const)
return True;
return False;
}
/*------------------------------------------------------------*/
/*--- Type management ---*/
/*------------------------------------------------------------*/
/* Shadow state is always accessed using integer types. This returns
an integer type with the same size (as per sizeofIRType) as the
given type. The only valid shadow types are Bit, I8, I16, I32,
I64, V128. */
static IRType shadowTypeV ( IRType ty )
{
switch (ty) {
case Ity_I1:
case Ity_I8:
case Ity_I16:
case Ity_I32:
case Ity_I64:
case Ity_I128: return ty;
case Ity_F16: return Ity_I16;
case Ity_F32: return Ity_I32;
case Ity_D32: return Ity_I32;
case Ity_F64: return Ity_I64;
case Ity_D64: return Ity_I64;
case Ity_F128: return Ity_I128;
case Ity_D128: return Ity_I128;
case Ity_V128: return Ity_V128;
case Ity_V256: return Ity_V256;
default: ppIRType(ty);
VG_(tool_panic)("tnt_translate.c: shadowTypeV");
}
}
/* Produce a 'defined' value of the given shadow type. Should only be
supplied shadow types (Bit/I8/I16/I32/UI64). */
static IRExpr* definedOfType ( IRType ty ) {
switch (ty) {
case Ity_I1: return IRExpr_Const(IRConst_U1(False));
case Ity_I8: return IRExpr_Const(IRConst_U8(0));
case Ity_I16: return IRExpr_Const(IRConst_U16(0));
case Ity_I32: return IRExpr_Const(IRConst_U32(0));
case Ity_I64: return IRExpr_Const(IRConst_U64(0));
case Ity_I128: return i128_const_zero();
case Ity_V128: return IRExpr_Const(IRConst_V128(0x0000));
case Ity_V256: return IRExpr_Const(IRConst_V256(0x00000000));
default: VG_(tool_panic)("tnt_translate.c: definedOfType");
}
}
/*------------------------------------------------------------*/
/*--- Constructing IR fragments ---*/
/*------------------------------------------------------------*/
/* add stmt to a bb */
static inline void stmt ( HChar cat, MCEnv* mce, IRStmt* st ) {
if (mce->trace) {
VG_(printf)(" %c: ", cat);
ppIRStmt(st);
VG_(printf)("\n");
}
addStmtToIRSB(mce->sb, st);
}
/* assign value to tmp */
static inline
void assign ( HChar cat, MCEnv* mce, IRTemp tmp, IRExpr* expr ) {
stmt(cat, mce, IRStmt_WrTmp(tmp,expr));
}
/* build various kinds of expressions */
#define triop(_op, _arg1, _arg2, _arg3) \
IRExpr_Triop((_op),(_arg1),(_arg2),(_arg3))
#define binop(_op, _arg1, _arg2) IRExpr_Binop((_op),(_arg1),(_arg2))
#define unop(_op, _arg) IRExpr_Unop((_op),(_arg))
#define mkU1(_n) IRExpr_Const(IRConst_U1(_n))
#define mkU8(_n) IRExpr_Const(IRConst_U8(_n))
#define mkU16(_n) IRExpr_Const(IRConst_U16(_n))
#define mkU32(_n) IRExpr_Const(IRConst_U32(_n))
#define mkU64(_n) IRExpr_Const(IRConst_U64(_n))
#define mkV128(_n) IRExpr_Const(IRConst_V128(_n))
#define mkexpr(_tmp) IRExpr_RdTmp((_tmp))
/* Bind the given expression to a new temporary, and return the
temporary. This effectively converts an arbitrary expression into
an atom.
'ty' is the type of 'e' and hence the type that the new temporary
needs to be. But passing it in is redundant, since we can deduce
the type merely by inspecting 'e'. So at least use that fact to
assert that the two types agree. */
static IRAtom* assignNew ( HChar cat, MCEnv* mce, IRType ty, IRExpr* e )
{
TempKind k;
IRTemp t;
IRType tyE = typeOfIRExpr(mce->sb->tyenv, e);
tl_assert(tyE == ty); /* so 'ty' is redundant (!) */
switch (cat) {
case 'V': k = VSh; break;
// case 'B': k = BSh; break;
case 'C': k = Orig; break;
/* happens when we are making up new "orig"
expressions, for IRCAS handling */
default: tl_assert(0);
}
t = newTemp(mce, ty, k);
assign(cat, mce, t, e);
return mkexpr(t);
}
/*------------------------------------------------------------*/
/*--- Helper functions for 128-bit ops ---*/
/*------------------------------------------------------------*/
static IRExpr *i128_const_zero(void)
{
IRAtom* z64 = IRExpr_Const(IRConst_U64(0));
return binop(Iop_64HLto128, z64, z64);
}
/* There are no I128-bit loads and/or stores [as generated by any
current front ends]. So we do not need to worry about that in
expr2vbits_Load */
/*------------------------------------------------------------*/
/*--- Constructing definedness primitive ops ---*/
/*------------------------------------------------------------*/
/* --------- Defined-if-either-defined --------- */
static IRAtom* mkDifD8 ( MCEnv* mce, IRAtom* a1, IRAtom* a2 ) {
tl_assert(isShadowAtom(mce,a1));
tl_assert(isShadowAtom(mce,a2));
return assignNew('V', mce, Ity_I8, binop(Iop_And8, a1, a2));
}
static IRAtom* mkDifD16 ( MCEnv* mce, IRAtom* a1, IRAtom* a2 ) {
tl_assert(isShadowAtom(mce,a1));
tl_assert(isShadowAtom(mce,a2));
return assignNew('V', mce, Ity_I16, binop(Iop_And16, a1, a2));
}
static IRAtom* mkDifD32 ( MCEnv* mce, IRAtom* a1, IRAtom* a2 ) {
tl_assert(isShadowAtom(mce,a1));
tl_assert(isShadowAtom(mce,a2));
return assignNew('V', mce, Ity_I32, binop(Iop_And32, a1, a2));
}
static IRAtom* mkDifD64 ( MCEnv* mce, IRAtom* a1, IRAtom* a2 ) {
tl_assert(isShadowAtom(mce,a1));
tl_assert(isShadowAtom(mce,a2));
return assignNew('V', mce, Ity_I64, binop(Iop_And64, a1, a2));
}
static IRAtom* mkDifDV128 ( MCEnv* mce, IRAtom* a1, IRAtom* a2 ) {
tl_assert(isShadowAtom(mce,a1));
tl_assert(isShadowAtom(mce,a2));
return assignNew('V', mce, Ity_V128, binop(Iop_AndV128, a1, a2));
}
static IRAtom* mkDifDV256 ( MCEnv* mce, IRAtom* a1, IRAtom* a2 ) {
tl_assert(isShadowAtom(mce,a1));
tl_assert(isShadowAtom(mce,a2));
return assignNew('V', mce, Ity_V256, binop(Iop_AndV256, a1, a2));
}
/* --------- Undefined-if-either-undefined --------- */
static IRAtom* mkUifU8 ( MCEnv* mce, IRAtom* a1, IRAtom* a2 ) {
tl_assert(isShadowAtom(mce,a1));
tl_assert(isShadowAtom(mce,a2));
return assignNew('V', mce, Ity_I8, binop(Iop_Or8, a1, a2));
}
static IRAtom* mkUifU16 ( MCEnv* mce, IRAtom* a1, IRAtom* a2 ) {
tl_assert(isShadowAtom(mce,a1));
tl_assert(isShadowAtom(mce,a2));
return assignNew('V', mce, Ity_I16, binop(Iop_Or16, a1, a2));
}
static IRAtom* mkUifU32 ( MCEnv* mce, IRAtom* a1, IRAtom* a2 ) {
tl_assert(isShadowAtom(mce,a1));
tl_assert(isShadowAtom(mce,a2));
return assignNew('V', mce, Ity_I32, binop(Iop_Or32, a1, a2));
}
static IRAtom* mkUifU64 ( MCEnv* mce, IRAtom* a1, IRAtom* a2 ) {
tl_assert(isShadowAtom(mce,a1));
tl_assert(isShadowAtom(mce,a2));
return assignNew('V', mce, Ity_I64, binop(Iop_Or64, a1, a2));
}
static IRAtom* mkUifUV128 ( MCEnv* mce, IRAtom* a1, IRAtom* a2 ) {
tl_assert(isShadowAtom(mce,a1));
tl_assert(isShadowAtom(mce,a2));
return assignNew('V', mce, Ity_V128, binop(Iop_OrV128, a1, a2));
}
static IRAtom* mkUifUV256 ( MCEnv* mce, IRAtom* a1, IRAtom* a2 ) {
tl_assert(isShadowAtom(mce,a1));
tl_assert(isShadowAtom(mce,a2));
return assignNew('V', mce, Ity_V256, binop(Iop_OrV256, a1, a2));
}
static IRAtom* mkUifU ( MCEnv* mce, IRType vty, IRAtom* a1, IRAtom* a2 ) {
switch (vty) {
case Ity_I8: return mkUifU8(mce, a1, a2);
case Ity_I16: return mkUifU16(mce, a1, a2);
case Ity_I32: return mkUifU32(mce, a1, a2);
case Ity_I64: return mkUifU64(mce, a1, a2);
case Ity_V128: return mkUifUV128(mce, a1, a2);
case Ity_V256: return mkUifUV256(mce, a1, a2);
default:
VG_(printf)("\n"); ppIRType(vty); VG_(printf)("\n");
VG_(tool_panic)("tnt_translate.c:mkUifU");
}
}
/* --------- The Left-family of operations. --------- */
static IRAtom* mkLeft8 ( MCEnv* mce, IRAtom* a1 ) {
tl_assert(isShadowAtom(mce,a1));
return assignNew('V', mce, Ity_I8, unop(Iop_Left8, a1));
}
static IRAtom* mkLeft16 ( MCEnv* mce, IRAtom* a1 ) {
tl_assert(isShadowAtom(mce,a1));
return assignNew('V', mce, Ity_I16, unop(Iop_Left16, a1));
}
static IRAtom* mkLeft32 ( MCEnv* mce, IRAtom* a1 ) {
tl_assert(isShadowAtom(mce,a1));
return assignNew('V', mce, Ity_I32, unop(Iop_Left32, a1));
}
static IRAtom* mkLeft64 ( MCEnv* mce, IRAtom* a1 ) {
tl_assert(isShadowAtom(mce,a1));
return assignNew('V', mce, Ity_I64, unop(Iop_Left64, a1));
}
/* --------- 'Improvement' functions for AND/OR. --------- */
/* ImproveAND(data, vbits) = data OR vbits. Defined (0) data 0s give
defined (0); all other -> undefined (1).
*/
static IRAtom* mkImproveAND8 ( MCEnv* mce, IRAtom* data, IRAtom* vbits )
{
tl_assert(isOriginalAtom(mce, data));
tl_assert(isShadowAtom(mce, vbits));
tl_assert(sameKindedAtoms(data, vbits));
return assignNew('V', mce, Ity_I8, binop(Iop_Or8, data, vbits));
}
static IRAtom* mkImproveAND16 ( MCEnv* mce, IRAtom* data, IRAtom* vbits )
{
tl_assert(isOriginalAtom(mce, data));
tl_assert(isShadowAtom(mce, vbits));
tl_assert(sameKindedAtoms(data, vbits));
return assignNew('V', mce, Ity_I16, binop(Iop_Or16, data, vbits));
}
static IRAtom* mkImproveAND32 ( MCEnv* mce, IRAtom* data, IRAtom* vbits )
{
tl_assert(isOriginalAtom(mce, data));
tl_assert(isShadowAtom(mce, vbits));
tl_assert(sameKindedAtoms(data, vbits));
return assignNew('V', mce, Ity_I32, binop(Iop_Or32, data, vbits));
}
static IRAtom* mkImproveAND64 ( MCEnv* mce, IRAtom* data, IRAtom* vbits )
{
tl_assert(isOriginalAtom(mce, data));
tl_assert(isShadowAtom(mce, vbits));
tl_assert(sameKindedAtoms(data, vbits));
return assignNew('V', mce, Ity_I64, binop(Iop_Or64, data, vbits));
}
static IRAtom* mkImproveANDV128 ( MCEnv* mce, IRAtom* data, IRAtom* vbits )
{
tl_assert(isOriginalAtom(mce, data));
tl_assert(isShadowAtom(mce, vbits));
tl_assert(sameKindedAtoms(data, vbits));
return assignNew('V', mce, Ity_V128, binop(Iop_OrV128, data, vbits));
}
static IRAtom* mkImproveANDV256 ( MCEnv* mce, IRAtom* data, IRAtom* vbits )
{
tl_assert(isOriginalAtom(mce, data));
tl_assert(isShadowAtom(mce, vbits));
tl_assert(sameKindedAtoms(data, vbits));
return assignNew('V', mce, Ity_V256, binop(Iop_OrV256, data, vbits));
}
/* ImproveOR(data, vbits) = ~data OR vbits. Defined (0) data 1s give
defined (0); all other -> undefined (1).
*/
static IRAtom* mkImproveOR8 ( MCEnv* mce, IRAtom* data, IRAtom* vbits )
{
tl_assert(isOriginalAtom(mce, data));
tl_assert(isShadowAtom(mce, vbits));
tl_assert(sameKindedAtoms(data, vbits));
return assignNew(
'V', mce, Ity_I8,
binop(Iop_Or8,
assignNew('V', mce, Ity_I8, unop(Iop_Not8, data)),
vbits) );
}
static IRAtom* mkImproveOR16 ( MCEnv* mce, IRAtom* data, IRAtom* vbits )
{
tl_assert(isOriginalAtom(mce, data));
tl_assert(isShadowAtom(mce, vbits));
tl_assert(sameKindedAtoms(data, vbits));
return assignNew(
'V', mce, Ity_I16,
binop(Iop_Or16,
assignNew('V', mce, Ity_I16, unop(Iop_Not16, data)),
vbits) );
}
static IRAtom* mkImproveOR32 ( MCEnv* mce, IRAtom* data, IRAtom* vbits )
{
tl_assert(isOriginalAtom(mce, data));
tl_assert(isShadowAtom(mce, vbits));
tl_assert(sameKindedAtoms(data, vbits));
return assignNew(
'V', mce, Ity_I32,
binop(Iop_Or32,
assignNew('V', mce, Ity_I32, unop(Iop_Not32, data)),
vbits) );
}
static IRAtom* mkImproveOR64 ( MCEnv* mce, IRAtom* data, IRAtom* vbits )
{
tl_assert(isOriginalAtom(mce, data));
tl_assert(isShadowAtom(mce, vbits));
tl_assert(sameKindedAtoms(data, vbits));
return assignNew(
'V', mce, Ity_I64,
binop(Iop_Or64,
assignNew('V', mce, Ity_I64, unop(Iop_Not64, data)),
vbits) );
}
static IRAtom* mkImproveORV128 ( MCEnv* mce, IRAtom* data, IRAtom* vbits )
{
tl_assert(isOriginalAtom(mce, data));
tl_assert(isShadowAtom(mce, vbits));
tl_assert(sameKindedAtoms(data, vbits));
return assignNew(
'V', mce, Ity_V128,
binop(Iop_OrV128,
assignNew('V', mce, Ity_V128, unop(Iop_NotV128, data)),
vbits) );
}
static IRAtom* mkImproveORV256 ( MCEnv* mce, IRAtom* data, IRAtom* vbits )
{
tl_assert(isOriginalAtom(mce, data));
tl_assert(isShadowAtom(mce, vbits));
tl_assert(sameKindedAtoms(data, vbits));
return assignNew(
'V', mce, Ity_V256,
binop(Iop_OrV256,
assignNew('V', mce, Ity_V256, unop(Iop_NotV256, data)),
vbits) );
}
/* --------- Pessimising casts. --------- */
static IRAtom* mkPCastTo( MCEnv* mce, IRType dst_ty, IRAtom* vbits )
{
IRType src_ty;
IRAtom* tmp1;
/* Note, dst_ty is a shadow type, not an original type. */
tl_assert(isShadowAtom(mce,vbits));
src_ty = typeOfIRExpr(mce->sb->tyenv, vbits);
/* Fast-track some common cases */
if (src_ty == Ity_I32 && dst_ty == Ity_I32)
return assignNew('V', mce, Ity_I32, unop(Iop_CmpwNEZ32, vbits));
if (src_ty == Ity_I64 && dst_ty == Ity_I64)
return assignNew('V', mce, Ity_I64, unop(Iop_CmpwNEZ64, vbits));
if (src_ty == Ity_I32 && dst_ty == Ity_I64) {
IRAtom* tmp = assignNew('V', mce, Ity_I32, unop(Iop_CmpwNEZ32, vbits));
return assignNew('V', mce, Ity_I64, binop(Iop_32HLto64, tmp, tmp));
}
if (src_ty == Ity_I32 && dst_ty == Ity_V128) {
/* PCast the arg, then clone it 4 times. */
IRAtom* tmp = assignNew('V', mce, Ity_I32, unop(Iop_CmpwNEZ32, vbits));
tmp = assignNew('V', mce, Ity_I64, binop(Iop_32HLto64, tmp, tmp));
return assignNew('V', mce, Ity_V128, binop(Iop_64HLtoV128, tmp, tmp));
}
if (src_ty == Ity_I32 && dst_ty == Ity_V256) {
/* PCast the arg, then clone it 8 times. */
IRAtom* tmp = assignNew('V', mce, Ity_I32, unop(Iop_CmpwNEZ32, vbits));
tmp = assignNew('V', mce, Ity_I64, binop(Iop_32HLto64, tmp, tmp));
tmp = assignNew('V', mce, Ity_V128, binop(Iop_64HLtoV128, tmp, tmp));
return assignNew('V', mce, Ity_V256, binop(Iop_V128HLtoV256, tmp, tmp));
}
if (src_ty == Ity_I64 && dst_ty == Ity_I32) {
/* PCast the arg. This gives all 0s or all 1s. Then throw away
the top half. */
IRAtom* tmp = assignNew('V', mce, Ity_I64, unop(Iop_CmpwNEZ64, vbits));
return assignNew('V', mce, Ity_I32, unop(Iop_64to32, tmp));
}
if (src_ty == Ity_V128 && dst_ty == Ity_I64) {
/* Use InterleaveHI64x2 to copy the top half of the vector into
the bottom half. Then we can UifU it with the original, throw
away the upper half of the result, and PCast-I64-to-I64
the lower half. */
// Generates vbits[127:64] : vbits[127:64]
IRAtom* hi64hi64
= assignNew('V', mce, Ity_V128,
binop(Iop_InterleaveHI64x2, vbits, vbits));
// Generates
// UifU(vbits[127:64],vbits[127:64]) : UifU(vbits[127:64],vbits[63:0])
// == vbits[127:64] : UifU(vbits[127:64],vbits[63:0])
IRAtom* lohi64
= mkUifUV128(mce, hi64hi64, vbits);
// Generates UifU(vbits[127:64],vbits[63:0])
IRAtom* lo64
= assignNew('V', mce, Ity_I64, unop(Iop_V128to64, lohi64));
// Generates
// PCast-to-I64( UifU(vbits[127:64], vbits[63:0] )
// == PCast-to-I64( vbits[127:0] )
IRAtom* res
= assignNew('V', mce, Ity_I64, unop(Iop_CmpwNEZ64, lo64));
return res;
}
/* Else do it the slow way .. */
/* First of all, collapse vbits down to a single bit. */
tmp1 = NULL;
switch (src_ty) {
case Ity_I1:
tmp1 = vbits;
break;
case Ity_I8:
tmp1 = assignNew('V', mce, Ity_I1, unop(Iop_CmpNEZ8, vbits));
break;
case Ity_I16:
tmp1 = assignNew('V', mce, Ity_I1, unop(Iop_CmpNEZ16, vbits));
break;
case Ity_I32:
tmp1 = assignNew('V', mce, Ity_I1, unop(Iop_CmpNEZ32, vbits));
break;
case Ity_I64:
tmp1 = assignNew('V', mce, Ity_I1, unop(Iop_CmpNEZ64, vbits));
break;
case Ity_I128: {
/* Gah. Chop it in half, OR the halves together, and compare
that with zero. */
IRAtom* tmp2 = assignNew('V', mce, Ity_I64, unop(Iop_128HIto64, vbits));
IRAtom* tmp3 = assignNew('V', mce, Ity_I64, unop(Iop_128to64, vbits));
IRAtom* tmp4 = assignNew('V', mce, Ity_I64, binop(Iop_Or64, tmp2, tmp3));
tmp1 = assignNew('V', mce, Ity_I1,
unop(Iop_CmpNEZ64, tmp4));
break;
}
case Ity_V128: {
/* Chop it in half, OR the halves together, and compare that
* with zero.
*/
IRAtom* tmp2 = assignNew('V', mce, Ity_I64, unop(Iop_V128HIto64, vbits));
IRAtom* tmp3 = assignNew('V', mce, Ity_I64, unop(Iop_V128to64, vbits));
IRAtom* tmp4 = assignNew('V', mce, Ity_I64, binop(Iop_Or64, tmp2, tmp3));
tmp1 = assignNew('V', mce, Ity_I1,
unop(Iop_CmpNEZ64, tmp4));
break;
}
case Ity_V256: {
/* Chop it in half, OR the halves together, and compare that
* with zero.
*/
IRAtom* tmp2 = assignNew('V', mce, Ity_I64, unop(Iop_V256to64_0, vbits));
IRAtom* tmp3 = assignNew('V', mce, Ity_I64, unop(Iop_V256to64_1, vbits));
IRAtom* tmp4 = assignNew('V', mce, Ity_I64, binop(Iop_Or64, tmp2, tmp3));
IRAtom* tmp5 = assignNew('V', mce, Ity_I64, unop(Iop_V256to64_2, vbits));
IRAtom* tmp6 = assignNew('V', mce, Ity_I64, unop(Iop_V256to64_3, vbits));
IRAtom* tmp7 = assignNew('V', mce, Ity_I64, binop(Iop_Or64, tmp5, tmp6));
IRAtom* tmp8 = assignNew('V', mce, Ity_I64, binop(Iop_Or64, tmp4, tmp7));
tmp1 = assignNew('V', mce, Ity_I1,
unop(Iop_CmpNEZ64, tmp8));
break;
}
default:
ppIRType(src_ty);
VG_(tool_panic)("tnt_translate.c: mkPCastTo(1)");
}
tl_assert(tmp1);
/* Now widen up to the dst type. */
switch (dst_ty) {
case Ity_I1:
return tmp1;
case Ity_I8:
return assignNew('V', mce, Ity_I8, unop(Iop_1Sto8, tmp1));
case Ity_I16:
return assignNew('V', mce, Ity_I16, unop(Iop_1Sto16, tmp1));
case Ity_I32:
return assignNew('V', mce, Ity_I32, unop(Iop_1Sto32, tmp1));
case Ity_I64:
return assignNew('V', mce, Ity_I64, unop(Iop_1Sto64, tmp1));
case Ity_V128:
tmp1 = assignNew('V', mce, Ity_I64, unop(Iop_1Sto64, tmp1));
tmp1 = assignNew('V', mce, Ity_V128, binop(Iop_64HLtoV128, tmp1, tmp1));
return tmp1;
case Ity_I128:
tmp1 = assignNew('V', mce, Ity_I64, unop(Iop_1Sto64, tmp1));
tmp1 = assignNew('V', mce, Ity_I128, binop(Iop_64HLto128, tmp1, tmp1));
return tmp1;
case Ity_V256:
tmp1 = assignNew('V', mce, Ity_I64, unop(Iop_1Sto64, tmp1));
tmp1 = assignNew('V', mce, Ity_V128, binop(Iop_64HLtoV128,
tmp1, tmp1));
tmp1 = assignNew('V', mce, Ity_V256, binop(Iop_V128HLtoV256,
tmp1, tmp1));
return tmp1;
default:
ppIRType(dst_ty);
VG_(tool_panic)("tnt_translate.c: mkPCastTo(2)");
}
}
/* This is a minor variant. It takes an arg of some type and returns
a value of the same type. The result consists entirely of Defined
(zero) bits except its least significant bit, which is a PCast of
the entire argument down to a single bit. */
static IRAtom* mkPCastXXtoXXlsb ( MCEnv* mce, IRAtom* varg, IRType ty )
{
if (ty == Ity_V128) {
/* --- Case for V128 --- */
IRAtom* varg128 = varg;
// generates: PCast-to-I64(varg128)
IRAtom* pcdTo64 = mkPCastTo(mce, Ity_I64, varg128);
// Now introduce zeros (defined bits) in the top 63 places
// generates: Def--(63)--Def PCast-to-I1(varg128)
IRAtom* d63pc
= assignNew('V', mce, Ity_I64, binop(Iop_And64, pcdTo64, mkU64(1)));
// generates: Def--(64)--Def
IRAtom* d64
= definedOfType(Ity_I64);
// generates: Def--(127)--Def PCast-to-I1(varg128)
IRAtom* res
= assignNew('V', mce, Ity_V128, binop(Iop_64HLtoV128, d64, d63pc));
return res;
}
if (ty == Ity_I64) {
/* --- Case for I64 --- */
// PCast to 64
IRAtom* pcd = mkPCastTo(mce, Ity_I64, varg);
// Zero (Def) out the top 63 bits
IRAtom* res
= assignNew('V', mce, Ity_I64, binop(Iop_And64, pcd, mkU64(1)));
return res;
}
/*NOTREACHED*/
tl_assert(0);
}
/* --------- Accurate interpretation of CmpEQ/CmpNE. --------- */
static IRAtom* expensiveCmpEQorNE ( MCEnv* mce,
IRType ty,
IRAtom* vxx, IRAtom* vyy,
IRAtom* xx, IRAtom* yy )
{
IRAtom *naive, *vec, *improvement_term;
IRAtom *improved, *final_cast, *top;
IROp opDIFD, opUIFU, opXOR, opNOT, opCMP, opOR;
tl_assert(isShadowAtom(mce,vxx));
tl_assert(isShadowAtom(mce,vyy));
tl_assert(isOriginalAtom(mce,xx));
tl_assert(isOriginalAtom(mce,yy));
tl_assert(sameKindedAtoms(vxx,xx));
tl_assert(sameKindedAtoms(vyy,yy));
switch (ty) {
case Ity_I16:
opOR = Iop_Or16;
opDIFD = Iop_And16;
opUIFU = Iop_Or16;
opNOT = Iop_Not16;
opXOR = Iop_Xor16;
opCMP = Iop_CmpEQ16;
top = mkU16(0xFFFF);
break;
case Ity_I32:
opOR = Iop_Or32;
opDIFD = Iop_And32;
opUIFU = Iop_Or32;
opNOT = Iop_Not32;
opXOR = Iop_Xor32;
opCMP = Iop_CmpEQ32;
top = mkU32(0xFFFFFFFF);
break;
case Ity_I64:
opOR = Iop_Or64;
opDIFD = Iop_And64;
opUIFU = Iop_Or64;
opNOT = Iop_Not64;
opXOR = Iop_Xor64;
opCMP = Iop_CmpEQ64;
top = mkU64(0xFFFFFFFFFFFFFFFFULL);
break;
default:
VG_(tool_panic)("expensiveCmpEQorNE");
}
naive
= mkPCastTo(mce,ty,
assignNew('V', mce, ty, binop(opUIFU, vxx, vyy)));
vec
= assignNew(
'V', mce,ty,
binop( opOR,
assignNew('V', mce,ty, binop(opOR, vxx, vyy)),
assignNew(
'V', mce,ty,
unop( opNOT,
assignNew('V', mce,ty, binop(opXOR, xx, yy))))));
improvement_term
= mkPCastTo( mce,ty,
assignNew('V', mce,Ity_I1, binop(opCMP, vec, top)));
improved
= assignNew( 'V', mce,ty, binop(opDIFD, naive, improvement_term) );
final_cast
= mkPCastTo( mce, Ity_I1, improved );
return final_cast;
}
/* --------- Semi-accurate interpretation of CmpORD. --------- */
static Bool isZeroU32 ( IRAtom* e )
{
return
toBool( e->tag == Iex_Const
&& e->Iex.Const.con->tag == Ico_U32
&& e->Iex.Const.con->Ico.U32 == 0 );
}
static Bool isZeroU64 ( IRAtom* e )
{
return
toBool( e->tag == Iex_Const
&& e->Iex.Const.con->tag == Ico_U64
&& e->Iex.Const.con->Ico.U64 == 0 );
}
static IRAtom* doCmpORD ( MCEnv* mce,
IROp cmp_op,
IRAtom* xxhash, IRAtom* yyhash,
IRAtom* xx, IRAtom* yy )
{
Bool m64 = cmp_op == Iop_CmpORD64S || cmp_op == Iop_CmpORD64U;
Bool syned = cmp_op == Iop_CmpORD64S || cmp_op == Iop_CmpORD32S;
IROp opOR = m64 ? Iop_Or64 : Iop_Or32;
IROp opAND = m64 ? Iop_And64 : Iop_And32;
IROp opSHL = m64 ? Iop_Shl64 : Iop_Shl32;
IROp opSHR = m64 ? Iop_Shr64 : Iop_Shr32;
IRType ty = m64 ? Ity_I64 : Ity_I32;
Int width = m64 ? 64 : 32;
Bool (*isZero)(IRAtom*) = m64 ? isZeroU64 : isZeroU32;
IRAtom* threeLeft1 = NULL;
IRAtom* sevenLeft1 = NULL;
tl_assert(isShadowAtom(mce,xxhash));
tl_assert(isShadowAtom(mce,yyhash));
tl_assert(isOriginalAtom(mce,xx));
tl_assert(isOriginalAtom(mce,yy));
tl_assert(sameKindedAtoms(xxhash,xx));
tl_assert(sameKindedAtoms(yyhash,yy));
tl_assert(cmp_op == Iop_CmpORD32S || cmp_op == Iop_CmpORD32U
|| cmp_op == Iop_CmpORD64S || cmp_op == Iop_CmpORD64U);
if (0) {
ppIROp(cmp_op); VG_(printf)(" ");
ppIRExpr(xx); VG_(printf)(" "); ppIRExpr( yy ); VG_(printf)("\n");
}
if (syned && isZero(yy)) {
/* fancy interpretation */
/* if yy is zero, then it must be fully defined (zero#). */
tl_assert(isZero(yyhash));
threeLeft1 = m64 ? mkU64(3<<1) : mkU32(3<<1);
return
binop(
opOR,
assignNew(
'V', mce,ty,
binop(
opAND,
mkPCastTo(mce,ty, xxhash),
threeLeft1
)),
assignNew(
'V', mce,ty,
binop(
opSHL,
assignNew(
'V', mce,ty,
binop(opSHR, xxhash, mkU8(width-1))),
mkU8(3)
))
);
} else {
/* standard interpretation */
sevenLeft1 = m64 ? mkU64(7<<1) : mkU32(7<<1);
return
binop(
opAND,
mkPCastTo( mce,ty,
mkUifU(mce,ty, xxhash,yyhash)),
sevenLeft1
);
}
}
/* Set the annotations on a dirty helper to indicate that the stack
pointer and instruction pointers might be read. This is the
behaviour of all 'emit-a-complaint' style functions we might
call. */
static void setHelperAnns ( MCEnv* mce, IRDirty* di ) {
di->nFxState = 2;
di->fxState[0].fx = Ifx_Read;
di->fxState[0].offset = mce->layout->offset_SP;
di->fxState[0].size = mce->layout->sizeof_SP;
di->fxState[0].nRepeats = 0;
di->fxState[0].repeatLen = 0;
di->fxState[1].fx = Ifx_Read;