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scanomf.d
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scanomf.d
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/**
* Compiler implementation of the
* $(LINK2 http://www.dlang.org, D programming language).
*
* Copyright: Copyright (C) 1999-2018 by The D Language Foundation, All Rights Reserved
* Authors: $(LINK2 http://www.digitalmars.com, Walter Bright)
* License: $(LINK2 http://www.boost.org/LICENSE_1_0.txt, Boost License 1.0)
* Source: $(LINK2 https://github.com/dlang/dmd/blob/master/src/dmd/scanomf.d, _scanomf.d)
* Documentation: https://dlang.org/phobos/dmd_scanomf.html
* Coverage: https://codecov.io/gh/dlang/dmd/src/master/src/dmd/scanomf.d
*/
module dmd.scanomf;
version(Windows):
import core.stdc.string;
import core.stdc.stdlib;
import dmd.globals;
import dmd.root.outbuffer;
import dmd.arraytypes;
import dmd.errors;
enum LOG = false;
/**************************
* Record types:
*/
enum RHEADR = 0x6E;
enum REGINT = 0x70;
enum REDATA = 0x72;
enum RIDATA = 0x74;
enum OVLDEF = 0x76;
enum ENDREC = 0x78;
enum BLKDEF = 0x7A;
enum BLKEND = 0x7C;
enum DEBSYM = 0x7E;
enum THEADR = 0x80;
enum LHEADR = 0x82;
enum PEDATA = 0x84;
enum PIDATA = 0x86;
enum COMENT = 0x88;
enum MODEND = 0x8A;
enum M386END = 0x8B; /* 32 bit module end record */
enum EXTDEF = 0x8C;
enum TYPDEF = 0x8E;
enum PUBDEF = 0x90;
enum PUB386 = 0x91;
enum LOCSYM = 0x92;
enum LINNUM = 0x94;
enum LNAMES = 0x96;
enum SEGDEF = 0x98;
enum GRPDEF = 0x9A;
enum FIXUPP = 0x9C;
/*#define (none) 0x9E */
enum LEDATA = 0xA0;
enum LIDATA = 0xA2;
enum LIBHED = 0xA4;
enum LIBNAM = 0xA6;
enum LIBLOC = 0xA8;
enum LIBDIC = 0xAA;
enum COMDEF = 0xB0;
enum LEXTDEF = 0xB4;
enum LPUBDEF = 0xB6;
enum LCOMDEF = 0xB8;
enum CEXTDEF = 0xBC;
enum COMDAT = 0xC2;
enum LINSYM = 0xC4;
enum ALIAS = 0xC6;
enum LLNAMES = 0xCA;
enum LIBIDMAX = (512 - 0x25 - 3 - 4);
// max size that will fit in dictionary
extern (C++) void parseName(const(ubyte)** pp, char* name)
{
auto p = *pp;
uint len = *p++;
if (len == 0xFF && *p == 0) // if long name
{
len = p[1] & 0xFF;
len |= cast(uint)p[2] << 8;
p += 3;
assert(len <= LIBIDMAX);
}
memcpy(name, p, len);
name[len] = 0;
*pp = p + len;
}
private ushort parseIdx(const(ubyte)** pp)
{
auto p = *pp;
const c = *p++;
ushort idx = (0x80 & c) ? ((0x7F & c) << 8) + *p++ : c;
*pp = p;
return idx;
}
// skip numeric field of a data type of a COMDEF record
private void skipNumericField(const(ubyte)** pp)
{
const(ubyte)* p = *pp;
const c = *p++;
if (c == 0x81)
p += 2;
else if (c == 0x84)
p += 3;
else if (c == 0x88)
p += 4;
else
assert(c <= 0x80);
*pp = p;
}
// skip data type of a COMDEF record
private void skipDataType(const(ubyte)** pp)
{
auto p = *pp;
const c = *p++;
if (c == 0x61)
{
// FAR data
skipNumericField(&p);
skipNumericField(&p);
}
else if (c == 0x62)
{
// NEAR data
skipNumericField(&p);
}
else
{
assert(1 <= c && c <= 0x5f); // Borland segment indices
}
*pp = p;
}
/*****************************************
* Reads an object module from base[] and passes the names
* of any exported symbols to (*pAddSymbol)().
* Params:
* pAddSymbol = function to pass the names to
* base = array of contents of object module
* module_name = name of the object module (used for error messages)
* loc = location to use for error printing
*/
void scanOmfObjModule(void delegate(const(char)[] name, int pickAny) pAddSymbol,
const(ubyte)[] base, const(char)* module_name, Loc loc)
{
static if (LOG)
{
printf("scanOmfObjModule(%s)\n", module_name);
}
const buf = base.ptr;
const buflen = base.length;
int easyomf;
ubyte result = 0;
char[LIBIDMAX + 1] name;
Strings names;
names.push(null); // don't use index 0
easyomf = 0; // assume not EASY-OMF
auto pend = cast(const(ubyte)*)base.ptr + buflen;
const(ubyte)* pnext;
for (auto p = cast(const(ubyte)*)base.ptr; 1; p = pnext)
{
assert(p < pend);
ubyte recTyp = *p++;
ushort recLen = *cast(ushort*)p;
p += 2;
pnext = p + recLen;
recLen--; // forget the checksum
switch (recTyp)
{
case LNAMES:
case LLNAMES:
while (p + 1 < pnext)
{
parseName(&p, name.ptr);
names.push(strdup(name.ptr));
}
break;
case PUBDEF:
if (easyomf)
recTyp = PUB386; // convert to MS format
goto case;
case PUB386:
if (!(parseIdx(&p) | parseIdx(&p)))
p += 2; // skip seg, grp, frame
while (p + 1 < pnext)
{
parseName(&p, name.ptr);
p += (recTyp == PUBDEF) ? 2 : 4; // skip offset
parseIdx(&p); // skip type index
pAddSymbol(name[0 .. strlen(name.ptr)], 0);
}
break;
case COMDAT:
if (easyomf)
recTyp = COMDAT + 1; // convert to MS format
goto case;
case COMDAT + 1:
{
int pickAny = 0;
if (*p++ & 5) // if continuation or local comdat
break;
ubyte attr = *p++;
if (attr & 0xF0) // attr: if multiple instances allowed
pickAny = 1;
p++; // align
p += 2; // enum data offset
if (recTyp == COMDAT + 1)
p += 2; // enum data offset
parseIdx(&p); // type index
if ((attr & 0x0F) == 0) // if explicit allocation
{
parseIdx(&p); // base group
parseIdx(&p); // base segment
}
uint idx = parseIdx(&p); // public name index
if (idx == 0 || idx >= names.dim)
{
//debug(printf("[s] name idx=%d, uCntNames=%d\n", idx, uCntNames));
error(loc, "corrupt COMDAT");
return;
}
//printf("[s] name='%s'\n",name);
const(char)* n = names[idx];
pAddSymbol(n[0 .. strlen(name.ptr)], pickAny);
break;
}
case COMDEF:
{
while (p + 1 < pnext)
{
parseName(&p, name.ptr);
parseIdx(&p); // type index
skipDataType(&p); // data type
pAddSymbol(name[0 .. strlen(name.ptr)], 1);
}
break;
}
case ALIAS:
while (p + 1 < pnext)
{
parseName(&p, name.ptr);
pAddSymbol(name[0 .. strlen(name.ptr)], 0);
parseName(&p, name.ptr);
}
break;
case MODEND:
case M386END:
result = 1;
goto Ret;
case COMENT:
// Recognize Phar Lap EASY-OMF format
{
__gshared ubyte* omfstr1 = [0x80, 0xAA, '8', '0', '3', '8', '6'];
if (recLen == (omfstr1).sizeof)
{
for (uint i = 0; i < (omfstr1).sizeof; i++)
if (*p++ != omfstr1[i])
goto L1;
easyomf = 1;
break;
L1:
}
}
// Recognize .IMPDEF Import Definition Records
{
__gshared ubyte* omfstr2 = [0, 0xA0, 1];
if (recLen >= 7)
{
p++;
for (uint i = 1; i < (omfstr2).sizeof; i++)
if (*p++ != omfstr2[i])
goto L2;
p++; // skip OrdFlag field
parseName(&p, name.ptr);
pAddSymbol(name[0 .. strlen(name.ptr)], 0);
break;
L2:
}
}
break;
default:
// ignore
}
}
Ret:
for (size_t u = 1; u < names.dim; u++)
free(cast(void*)names[u]);
}
/*************************************************
* Scan a block of memory buf[0..buflen], pulling out each
* OMF object module in it and sending the info in it to (*pAddObjModule).
* Returns:
* true for corrupt OMF data
*/
bool scanOmfLib(void delegate(char* name, void* base, size_t length) pAddObjModule, void* buf, size_t buflen, uint pagesize)
{
/* Split up the buffer buf[0..buflen] into multiple object modules,
* each aligned on a pagesize boundary.
*/
bool first_module = true;
const(ubyte)* base = null;
char[LIBIDMAX + 1] name;
auto p = cast(const(ubyte)*)buf;
auto pend = p + buflen;
const(ubyte)* pnext;
for (; p < pend; p = pnext) // for each OMF record
{
if (p + 3 >= pend)
return true; // corrupt
ubyte recTyp = *p;
ushort recLen = *cast(const(ushort)*)(p + 1);
pnext = p + 3 + recLen;
if (pnext > pend)
return true; // corrupt
recLen--; // forget the checksum
switch (recTyp)
{
case LHEADR:
case THEADR:
if (!base)
{
base = p;
p += 3;
parseName(&p, name.ptr);
if (name[0] == 'C' && name[1] == 0) // old C compilers did this
base = pnext; // skip past THEADR
}
break;
case MODEND:
case M386END:
{
if (base)
{
pAddObjModule(name.ptr, cast(ubyte*)base, pnext - base);
base = null;
}
// Round up to next page
uint t = cast(uint)(pnext - cast(const(ubyte)*)buf);
t = (t + pagesize - 1) & ~cast(uint)(pagesize - 1);
pnext = cast(const(ubyte)*)buf + t;
break;
}
default:
// ignore
}
}
return (base !is null); // missing MODEND record
}
uint OMFObjSize(const(void)* base, uint length, const(char)* name)
{
ubyte c = *cast(const(ubyte)*)base;
if (c != THEADR && c != LHEADR)
{
size_t len = strlen(name);
assert(len <= LIBIDMAX);
length += len + 5;
}
return length;
}
void writeOMFObj(OutBuffer* buf, const(void)* base, uint length, const(char)* name)
{
ubyte c = *cast(const(ubyte)*)base;
if (c != THEADR && c != LHEADR)
{
const len = strlen(name);
assert(len <= LIBIDMAX);
ubyte[4 + LIBIDMAX + 1] header;
header[0] = THEADR;
header[1] = cast(ubyte)(2 + len);
header[2] = 0;
header[3] = cast(ubyte)len;
assert(len <= 0xFF - 2);
memcpy(4 + header.ptr, name, len);
// Compute and store record checksum
uint n = cast(uint)(len + 4);
ubyte checksum = 0;
ubyte* p = header.ptr;
while (n--)
{
checksum -= *p;
p++;
}
*p = checksum;
buf.write(header.ptr, len + 5);
}
buf.write(base, length);
}