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/* -*- mode: C; c-basic-offset: 3; -*- */
/*--------------------------------------------------------------------*/
/*--- Read DWARF3/4 ".debug_info" sections (DIE trees). ---*/
/*--- readdwarf3.c ---*/
/*--------------------------------------------------------------------*/
/*
This file is part of Valgrind, a dynamic binary instrumentation
framework.
Copyright (C) 2008-2013 OpenWorks LLP
info@open-works.co.uk
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.
Neither the names of the U.S. Department of Energy nor the
University of California nor the names of its contributors may be
used to endorse or promote products derived from this software
without prior written permission.
*/
#if defined(VGO_linux) || defined(VGO_darwin)
/* REFERENCE (without which this code will not make much sense):
DWARF Debugging Information Format, Version 3,
dated 20 December 2005 (the "D3 spec").
Available at http://www.dwarfstd.org/Dwarf3.pdf. There's also a
.doc (MS Word) version, but for some reason the section numbers
between the Word and PDF versions differ by 1 in the first digit.
All section references in this code are to the PDF version.
CURRENT HACKS:
DW_TAG_{const,volatile}_type no DW_AT_type is allowed; it is
assumed to mean "const void" or "volatile void" respectively.
GDB appears to interpret them like this, anyway.
In many cases it is important to know the svma of a CU (the "base
address of the CU", as the D3 spec calls it). There are some
situations in which the spec implies this value is unknown, but the
Dwarf3 produced by gcc-4.1 seems to assume is not unknown but
merely zero when not explicitly stated. So we too have to make
that assumption.
POTENTIAL BUG? Spotted 6 Sept 08. Why doesn't
unitary_range_list() bias the resulting range list in the same way
that its more general cousin, get_range_list(), does? I don't
know.
TODO, 2008 Feb 17:
get rid of cu_svma_known and document the assumed-zero svma hack.
ML_(sizeOfType): differentiate between zero sized types and types
for which the size is unknown. Is this important? I don't know.
DW_TAG_array_types: deal with explicit sizes (currently we compute
the size from the bounds and the element size, although that's
fragile, if the bounds incompletely specified, or completely
absent)
Document reason for difference (by 1) of stack preening depth in
parse_var_DIE vs parse_type_DIE.
Don't hand to ML_(addVars), vars whose locations are entirely in
registers (DW_OP_reg*). This is merely a space-saving
optimisation, as ML_(evaluate_Dwarf3_Expr) should handle these
expressions correctly, by failing to evaluate them and hence
effectively ignoring the variable with which they are associated.
Deal with DW_TAG_array_types which have element size != stride
In some cases, the info for a variable is split between two
different DIEs (generally a declarer and a definer). We punt on
these. Could do better here.
The 'data_bias' argument passed to the expression evaluator
(ML_(evaluate_Dwarf3_Expr)) should really be changed to a
MaybeUWord, to make it clear when we do vs don't know what it is
for the evaluation of an expression. At the moment zero is passed
for this parameter in the don't know case. That's a bit fragile
and obscure; using a MaybeUWord would be clearer.
POTENTIAL PERFORMANCE IMPROVEMENTS:
Currently, duplicate removal and all other queries for the type
entities array is done using cuOffset-based pointing, which
involves a binary search (VG_(lookupXA)) for each access. This is
wildly inefficient, although simple. It would be better to
translate all the cuOffset-based references (iow, all the "R" and
"Rs" fields in the TyEnts in 'tyents') to direct index numbers in
'tyents' right at the start of dedup_types(), and use direct
indexing (VG_(indexXA)) wherever possible after that.
cmp__XArrays_of_AddrRange is also a performance bottleneck. Move
VG_(indexXA) into pub_tool_xarray.h so it can be inlined at all use
points, and possibly also make an _UNCHECKED version which skips
the range checks in performance-critical situations such as this.
Handle interaction between read_DIE and parse_{var,type}_DIE
better. Currently read_DIE reads the entire DIE just to find where
the end is (and for debug printing), so that it can later reliably
move the cursor to the end regardless of what parse_{var,type}_DIE
do. This means many DIEs (most, even?) are read twice. It would
be smarter to make parse_{var,type}_DIE return a Bool indicating
whether or not they advanced the DIE cursor, and only if they
didn't should read_DIE itself read through the DIE.
ML_(addVar) and add_var_to_arange: quite a lot of DiAddrRanges have
zero variables in their .vars XArray. Rather than have an XArray
with zero elements (which uses 2 malloc'd blocks), allow the .vars
pointer to be NULL in this case.
More generally, reduce the amount of memory allocated and freed
while reading Dwarf3 type/variable information. Even modest (20MB)
objects cause this module to allocate and free hundreds of
thousands of small blocks, and ML_(arena_malloc) and its various
groupies always show up at the top of performance profiles. */
#include "pub_core_basics.h"
#include "pub_core_debuginfo.h"
#include "pub_core_libcbase.h"
#include "pub_core_libcassert.h"
#include "pub_core_libcprint.h"
#include "pub_core_libcsetjmp.h" // setjmp facilities
#include "pub_core_hashtable.h"
#include "pub_core_options.h"
#include "pub_core_tooliface.h" /* VG_(needs) */
#include "pub_core_xarray.h"
#include "pub_core_wordfm.h"
#include "priv_misc.h" /* dinfo_zalloc/free */
#include "priv_image.h"
#include "priv_tytypes.h"
#include "priv_d3basics.h"
#include "priv_storage.h"
#include "priv_readdwarf3.h" /* self */
/*------------------------------------------------------------*/
/*--- ---*/
/*--- Basic machinery for parsing DIEs. ---*/
/*--- ---*/
/*------------------------------------------------------------*/
#define TRACE_D3(format, args...) \
if (td3) { VG_(printf)(format, ## args); }
#define D3_INVALID_CUOFF ((UWord)(-1UL))
#define D3_FAKEVOID_CUOFF ((UWord)(-2UL))
typedef
struct {
DiSlice sli; // to which this cursor applies
DiOffT sli_next; // offset in underlying DiImage; must be >= sli.ioff
void (*barf)( const HChar* ) __attribute__((noreturn));
const HChar* barfstr;
}
Cursor;
static inline Bool is_sane_Cursor ( Cursor* c ) {
if (!c) return False;
if (!c->barf) return False;
if (!c->barfstr) return False;
if (!ML_(sli_is_valid)(c->sli)) return False;
if (c->sli.ioff == DiOffT_INVALID) return False;
if (c->sli_next < c->sli.ioff) return False;
return True;
}
// Initialise a cursor from a DiSlice (ELF section, really) so as to
// start reading at offset |sli_initial_offset| from the start of the
// slice.
static void init_Cursor ( /*OUT*/Cursor* c,
DiSlice sli,
ULong sli_initial_offset,
__attribute__((noreturn)) void (*barf)(const HChar*),
const HChar* barfstr )
{
vg_assert(c);
VG_(bzero_inline)(c, sizeof(*c));
c->sli = sli;
c->sli_next = c->sli.ioff + sli_initial_offset;
c->barf = barf;
c->barfstr = barfstr;
vg_assert(is_sane_Cursor(c));
}
static Bool is_at_end_Cursor ( Cursor* c ) {
vg_assert(is_sane_Cursor(c));
return c->sli_next >= c->sli.ioff + c->sli.szB;
}
static inline ULong get_position_of_Cursor ( Cursor* c ) {
vg_assert(is_sane_Cursor(c));
return c->sli_next - c->sli.ioff;
}
static inline void set_position_of_Cursor ( Cursor* c, ULong pos ) {
c->sli_next = c->sli.ioff + pos;
vg_assert(is_sane_Cursor(c));
}
static /*signed*/Long get_remaining_length_Cursor ( Cursor* c ) {
vg_assert(is_sane_Cursor(c));
return c->sli.ioff + c->sli.szB - c->sli_next;
}
//static void* get_address_of_Cursor ( Cursor* c ) {
// vg_assert(is_sane_Cursor(c));
// return &c->region_start_img[ c->region_next ];
//}
static DiCursor get_DiCursor_from_Cursor ( Cursor* c ) {
return mk_DiCursor(c->sli.img, c->sli_next);
}
/* FIXME: document assumptions on endianness for
get_UShort/UInt/ULong. */
static inline UChar get_UChar ( Cursor* c ) {
UChar r;
vg_assert(is_sane_Cursor(c));
if (c->sli_next + sizeof(UChar) > c->sli.ioff + c->sli.szB) {
c->barf(c->barfstr);
/*NOTREACHED*/
vg_assert(0);
}
r = ML_(img_get_UChar)(c->sli.img, c->sli_next);
c->sli_next += sizeof(UChar);
return r;
}
static UShort get_UShort ( Cursor* c ) {
UShort r;
vg_assert(is_sane_Cursor(c));
if (c->sli_next + sizeof(UShort) > c->sli.ioff + c->sli.szB) {
c->barf(c->barfstr);
/*NOTREACHED*/
vg_assert(0);
}
r = ML_(img_get_UShort)(c->sli.img, c->sli_next);
c->sli_next += sizeof(UShort);
return r;
}
static UInt get_UInt ( Cursor* c ) {
UInt r;
vg_assert(is_sane_Cursor(c));
if (c->sli_next + sizeof(UInt) > c->sli.ioff + c->sli.szB) {
c->barf(c->barfstr);
/*NOTREACHED*/
vg_assert(0);
}
r = ML_(img_get_UInt)(c->sli.img, c->sli_next);
c->sli_next += sizeof(UInt);
return r;
}
static ULong get_ULong ( Cursor* c ) {
ULong r;
vg_assert(is_sane_Cursor(c));
if (c->sli_next + sizeof(ULong) > c->sli.ioff + c->sli.szB) {
c->barf(c->barfstr);
/*NOTREACHED*/
vg_assert(0);
}
r = ML_(img_get_ULong)(c->sli.img, c->sli_next);
c->sli_next += sizeof(ULong);
return r;
}
static ULong get_ULEB128 ( Cursor* c ) {
ULong result;
Int shift;
UChar byte;
/* unroll first iteration */
byte = get_UChar( c );
result = (ULong)(byte & 0x7f);
if (LIKELY(!(byte & 0x80))) return result;
shift = 7;
/* end unroll first iteration */
do {
byte = get_UChar( c );
result |= ((ULong)(byte & 0x7f)) << shift;
shift += 7;
} while (byte & 0x80);
return result;
}
static Long get_SLEB128 ( Cursor* c ) {
ULong result = 0;
Int shift = 0;
UChar byte;
do {
byte = get_UChar(c);
result |= ((ULong)(byte & 0x7f)) << shift;
shift += 7;
} while (byte & 0x80);
if (shift < 64 && (byte & 0x40))
result |= -(1ULL << shift);
return result;
}
/* Assume 'c' points to the start of a string. Return a DiCursor of
whatever it points at, and advance it past the terminating zero.
This makes it safe for the caller to then copy the string with
ML_(addStr), since (w.r.t. image overruns) the process of advancing
past the terminating zero will already have "vetted" the string. */
static DiCursor get_AsciiZ ( Cursor* c ) {
UChar uc;
DiCursor res = get_DiCursor_from_Cursor(c);
do { uc = get_UChar(c); } while (uc != 0);
return res;
}
static ULong peek_ULEB128 ( Cursor* c ) {
DiOffT here = c->sli_next;
ULong r = get_ULEB128( c );
c->sli_next = here;
return r;
}
static UChar peek_UChar ( Cursor* c ) {
DiOffT here = c->sli_next;
UChar r = get_UChar( c );
c->sli_next = here;
return r;
}
static ULong get_Dwarfish_UWord ( Cursor* c, Bool is_dw64 ) {
return is_dw64 ? get_ULong(c) : (ULong) get_UInt(c);
}
static UWord get_UWord ( Cursor* c ) {
vg_assert(sizeof(UWord) == sizeof(void*));
if (sizeof(UWord) == 4) return get_UInt(c);
if (sizeof(UWord) == 8) return get_ULong(c);
vg_assert(0);
}
/* Read a DWARF3 'Initial Length' field */
static ULong get_Initial_Length ( /*OUT*/Bool* is64,
Cursor* c,
const HChar* barfMsg )
{
ULong w64;
UInt w32;
*is64 = False;
w32 = get_UInt( c );
if (w32 >= 0xFFFFFFF0 && w32 < 0xFFFFFFFF) {
c->barf( barfMsg );
}
else if (w32 == 0xFFFFFFFF) {
*is64 = True;
w64 = get_ULong( c );
} else {
*is64 = False;
w64 = (ULong)w32;
}
return w64;
}
/*------------------------------------------------------------*/
/*--- ---*/
/*--- "CUConst" structure ---*/
/*--- ---*/
/*------------------------------------------------------------*/
#define N_ABBV_CACHE 32
/* Holds information that is constant through the parsing of a
Compilation Unit. This is basically plumbed through to
everywhere. */
typedef
struct {
/* Call here if anything goes wrong */
void (*barf)( const HChar* ) __attribute__((noreturn));
/* Is this 64-bit DWARF ? */
Bool is_dw64;
/* Which DWARF version ? (2, 3 or 4) */
UShort version;
/* Length of this Compilation Unit, as stated in the
.unit_length :: InitialLength field of the CU Header.
However, this size (as specified by the D3 spec) does not
include the size of the .unit_length field itself, which is
either 4 or 12 bytes (32-bit or 64-bit Dwarf3). That value
can be obtained through the expression ".is_dw64 ? 12 : 4". */
ULong unit_length;
/* Offset of start of this unit in .debug_info */
UWord cu_start_offset;
/* SVMA for this CU. In the D3 spec, is known as the "base
address of the compilation unit (last para sec 3.1.1).
Needed for (amongst things) interpretation of location-list
values. */
Addr cu_svma;
Bool cu_svma_known;
/* The debug_abbreviations table to be used for this Unit */
//UChar* debug_abbv;
/* Upper bound on size thereof (an overestimate, in general) */
//UWord debug_abbv_maxszB;
/* A bounded area of the image, to be used as the
debug_abbreviations table tobe used for this Unit. */
DiSlice debug_abbv;
/* Image information for various sections. */
DiSlice escn_debug_str;
DiSlice escn_debug_ranges;
DiSlice escn_debug_loc;
DiSlice escn_debug_line;
DiSlice escn_debug_info;
DiSlice escn_debug_types;
DiSlice escn_debug_info_alt;
DiSlice escn_debug_str_alt;
/* How much to add to .debug_types resp. alternate .debug_info offsets
in cook_die*. */
UWord types_cuOff_bias;
UWord alt_cuOff_bias;
/* --- Needed so we can add stuff to the string table. --- */
struct _DebugInfo* di;
/* --- a cache for set_abbv_Cursor --- */
/* abbv_code == (ULong)-1 for an unused entry. */
struct { ULong abbv_code; UWord posn; } saC_cache[N_ABBV_CACHE];
UWord saC_cache_queries;
UWord saC_cache_misses;
/* True if this came from .debug_types; otherwise it came from
.debug_info. */
Bool is_type_unit;
/* For a unit coming from .debug_types, these hold the TU's type
signature and the uncooked DIE offset of the TU's signatured
type. For a unit coming from .debug_info, these are unused. */
ULong type_signature;
ULong type_offset;
/* Signatured type hash; computed once and then shared by all
CUs. */
VgHashTable signature_types;
/* True if this came from alternate .debug_info; otherwise
it came from normal .debug_info or .debug_types. */
Bool is_alt_info;
}
CUConst;
/* Return the cooked value of DIE depending on whether CC represents a
.debug_types unit. To cook a DIE, we pretend that the .debug_info,
.debug_types and optional alternate .debug_info sections form
a contiguous whole, so that DIEs coming from .debug_types are numbered
starting at the end of .debug_info and DIEs coming from alternate
.debug_info are numbered starting at the end of .debug_types. */
static UWord cook_die( CUConst* cc, UWord die )
{
if (cc->is_type_unit)
die += cc->types_cuOff_bias;
else if (cc->is_alt_info)
die += cc->alt_cuOff_bias;
return die;
}
/* Like cook_die, but understand that DIEs coming from a
DW_FORM_ref_sig8 reference are already cooked. Also, handle
DW_FORM_GNU_ref_alt from within primary .debug_info or .debug_types
as reference to alternate .debug_info. */
static UWord cook_die_using_form( CUConst *cc, UWord die, DW_FORM form)
{
if (form == DW_FORM_ref_sig8)
return die;
if (form == DW_FORM_GNU_ref_alt)
return die + cc->alt_cuOff_bias;
return cook_die( cc, die );
}
/* Return the uncooked offset of DIE and set *TYPE_FLAG to true if the DIE
came from the .debug_types section and *ALT_FLAG to true if the DIE
came from alternate .debug_info section. */
static UWord uncook_die( CUConst *cc, UWord die, /*OUT*/Bool *type_flag,
Bool *alt_flag )
{
*alt_flag = False;
*type_flag = False;
/* The use of escn_debug_{info,types}.szB seems safe to me even if
escn_debug_{info,types} are DiSlice_INVALID (meaning the
sections were not found), because DiSlice_INVALID.szB is always
zero. That said, it seems unlikely we'd ever get here if
.debug_info or .debug_types were missing. */
if (die >= cc->escn_debug_info.szB) {
if (die >= cc->escn_debug_info.szB + cc->escn_debug_types.szB) {
*alt_flag = True;
die -= cc->escn_debug_info.szB + cc->escn_debug_types.szB;
} else {
*type_flag = True;
die -= cc->escn_debug_info.szB;
}
}
return die;
}
/*------------------------------------------------------------*/
/*--- ---*/
/*--- Helper functions for Guarded Expressions ---*/
/*--- ---*/
/*------------------------------------------------------------*/
/* Parse the location list starting at img-offset 'debug_loc_offset'
in .debug_loc. Results are biased with 'svma_of_referencing_CU'
and so I believe are correct SVMAs for the object as a whole. This
function allocates the UChar*, and the caller must deallocate it.
The resulting block is in so-called Guarded-Expression format.
Guarded-Expression format is similar but not identical to the DWARF3
location-list format. The format of each returned block is:
UChar biasMe;
UChar isEnd;
followed by zero or more of
(Addr aMin; Addr aMax; UShort nbytes; ..bytes..; UChar isEnd)
'..bytes..' is an standard DWARF3 location expression which is
valid when aMin <= pc <= aMax (possibly after suitable biasing).
The number of bytes in '..bytes..' is nbytes.
The end of the sequence is marked by an isEnd == 1 value. All
previous isEnd values must be zero.
biasMe is 1 if the aMin/aMax fields need this DebugInfo's
text_bias added before use, and 0 if the GX is this is not
necessary (is ready to go).
Hence the block can be quickly parsed and is self-describing. Note
that aMax is 1 less than the corresponding value in a DWARF3
location list. Zero length ranges, with aMax == aMin-1, are not
allowed.
*/
/* 2008-sept-12: moved ML_(pp_GX) from here to d3basics.c, where
it more logically belongs. */
/* Apply a text bias to a GX. */
static void bias_GX ( /*MOD*/GExpr* gx, struct _DebugInfo* di )
{
UShort nbytes;
UChar* p = &gx->payload[0];
UChar* pA;
UChar uc;
uc = *p++; /*biasMe*/
if (uc == 0)
return;
vg_assert(uc == 1);
p[-1] = 0; /* mark it as done */
while (True) {
uc = *p++;
if (uc == 1)
break; /*isEnd*/
vg_assert(uc == 0);
/* t-bias aMin */
pA = (UChar*)p;
ML_(write_Addr)(pA, ML_(read_Addr)(pA) + di->text_debug_bias);
p += sizeof(Addr);
/* t-bias aMax */
pA = (UChar*)p;
ML_(write_Addr)(pA, ML_(read_Addr)(pA) + di->text_debug_bias);
p += sizeof(Addr);
/* nbytes, and actual expression */
nbytes = ML_(read_UShort)(p); p += sizeof(UShort);
p += nbytes;
}
}
__attribute__((noinline))
static GExpr* make_singleton_GX ( DiCursor block, ULong nbytes )
{
SizeT bytesReqd;
GExpr* gx;
UChar *p, *pstart;
vg_assert(sizeof(UWord) == sizeof(Addr));
vg_assert(nbytes <= 0xFFFF); /* else we overflow the nbytes field */
bytesReqd
= sizeof(UChar) /*biasMe*/ + sizeof(UChar) /*!isEnd*/
+ sizeof(UWord) /*aMin*/ + sizeof(UWord) /*aMax*/
+ sizeof(UShort) /*nbytes*/ + (SizeT)nbytes
+ sizeof(UChar); /*isEnd*/
gx = ML_(dinfo_zalloc)( "di.readdwarf3.msGX.1",
sizeof(GExpr) + bytesReqd );
vg_assert(gx);
p = pstart = &gx->payload[0];
p = ML_(write_UChar)(p, 0); /*biasMe*/
p = ML_(write_UChar)(p, 0); /*!isEnd*/
p = ML_(write_Addr)(p, 0); /*aMin*/
p = ML_(write_Addr)(p, ~0); /*aMax*/
p = ML_(write_UShort)(p, nbytes); /*nbytes*/
ML_(cur_read_get)(p, block, nbytes); p += nbytes;
p = ML_(write_UChar)(p, 1); /*isEnd*/
vg_assert( (SizeT)(p - pstart) == bytesReqd);
vg_assert( &gx->payload[bytesReqd]
== ((UChar*)gx) + sizeof(GExpr) + bytesReqd );
return gx;
}
__attribute__((noinline))
static GExpr* make_general_GX ( CUConst* cc,
Bool td3,
ULong debug_loc_offset,
Addr svma_of_referencing_CU )
{
Addr base;
Cursor loc;
XArray* xa; /* XArray of UChar */
GExpr* gx;
Word nbytes;
vg_assert(sizeof(UWord) == sizeof(Addr));
if (!ML_(sli_is_valid)(cc->escn_debug_loc) || cc->escn_debug_loc.szB == 0)
cc->barf("make_general_GX: .debug_loc is empty/missing");
init_Cursor( &loc, cc->escn_debug_loc, 0, cc->barf,
"Overrun whilst reading .debug_loc section(2)" );
set_position_of_Cursor( &loc, debug_loc_offset );
TRACE_D3("make_general_GX (.debug_loc_offset = %llu, ioff = %llu) {\n",
debug_loc_offset, (ULong)get_DiCursor_from_Cursor(&loc).ioff );
/* Who frees this xa? It is freed before this fn exits. */
xa = VG_(newXA)( ML_(dinfo_zalloc), "di.readdwarf3.mgGX.1",
ML_(dinfo_free),
sizeof(UChar) );
{ UChar c = 1; /*biasMe*/ VG_(addBytesToXA)( xa, &c, sizeof(c) ); }
base = 0;
while (True) {
Bool acquire;
UWord len;
/* Read a (host-)word pair. This is something of a hack since
the word size to read is really dictated by the ELF file;
however, we assume we're reading a file with the same
word-sizeness as the host. Reasonably enough. */
UWord w1 = get_UWord( &loc );
UWord w2 = get_UWord( &loc );
TRACE_D3(" %08lx %08lx\n", w1, w2);
if (w1 == 0 && w2 == 0)
break; /* end of list */
if (w1 == -1UL) {
/* new value for 'base' */
base = w2;
continue;
}
/* else a location expression follows */
/* else enumerate [w1+base, w2+base) */
/* w2 is 1 past end of range, as per D3 defn for "DW_AT_high_pc"
(sec 2.17.2) */
if (w1 > w2) {
TRACE_D3("negative range is for .debug_loc expr at "
"file offset %llu\n",
debug_loc_offset);
cc->barf( "negative range in .debug_loc section" );
}
/* ignore zero length ranges */
acquire = w1 < w2;
len = (UWord)get_UShort( &loc );
if (acquire) {
UWord w;
UShort s;
UChar c;
c = 0; /* !isEnd*/
VG_(addBytesToXA)( xa, &c, sizeof(c) );
w = w1 + base + svma_of_referencing_CU;
VG_(addBytesToXA)( xa, &w, sizeof(w) );
w = w2 -1 + base + svma_of_referencing_CU;
VG_(addBytesToXA)( xa, &w, sizeof(w) );
s = (UShort)len;
VG_(addBytesToXA)( xa, &s, sizeof(s) );
}
while (len > 0) {
UChar byte = get_UChar( &loc );
TRACE_D3("%02x", (UInt)byte);
if (acquire)
VG_(addBytesToXA)( xa, &byte, 1 );
len--;
}
TRACE_D3("\n");
}
{ UChar c = 1; /*isEnd*/ VG_(addBytesToXA)( xa, &c, sizeof(c) ); }
nbytes = VG_(sizeXA)( xa );
vg_assert(nbytes >= 1);
gx = ML_(dinfo_zalloc)( "di.readdwarf3.mgGX.2", sizeof(GExpr) + nbytes );
vg_assert(gx);
VG_(memcpy)( &gx->payload[0], (UChar*)VG_(indexXA)(xa,0), nbytes );
vg_assert( &gx->payload[nbytes]
== ((UChar*)gx) + sizeof(GExpr) + nbytes );
VG_(deleteXA)( xa );
TRACE_D3("}\n");
return gx;
}
/*------------------------------------------------------------*/
/*--- ---*/
/*--- Helper functions for range lists and CU headers ---*/
/*--- ---*/
/*------------------------------------------------------------*/
/* Denotes an address range. Both aMin and aMax are included in the
range; hence a complete range is (0, ~0) and an empty range is any
(X, X-1) for X > 0.*/
typedef
struct { Addr aMin; Addr aMax; }
AddrRange;
/* Generate an arbitrary structural total ordering on
XArray* of AddrRange. */
static Word cmp__XArrays_of_AddrRange ( XArray* rngs1, XArray* rngs2 )
{
Word n1, n2, i;
tl_assert(rngs1 && rngs2);
n1 = VG_(sizeXA)( rngs1 );
n2 = VG_(sizeXA)( rngs2 );
if (n1 < n2) return -1;
if (n1 > n2) return 1;
for (i = 0; i < n1; i++) {
AddrRange* rng1 = (AddrRange*)VG_(indexXA)( rngs1, i );
AddrRange* rng2 = (AddrRange*)VG_(indexXA)( rngs2, i );
if (rng1->aMin < rng2->aMin) return -1;
if (rng1->aMin > rng2->aMin) return 1;
if (rng1->aMax < rng2->aMax) return -1;
if (rng1->aMax > rng2->aMax) return 1;
}
return 0;
}
__attribute__((noinline))
static XArray* /* of AddrRange */ empty_range_list ( void )
{
XArray* xa; /* XArray of AddrRange */
/* Who frees this xa? varstack_preen() does. */
xa = VG_(newXA)( ML_(dinfo_zalloc), "di.readdwarf3.erl.1",
ML_(dinfo_free),
sizeof(AddrRange) );
return xa;
}
__attribute__((noinline))
static XArray* unitary_range_list ( Addr aMin, Addr aMax )
{
XArray* xa;
AddrRange pair;
vg_assert(aMin <= aMax);
/* Who frees this xa? varstack_preen() does. */
xa = VG_(newXA)( ML_(dinfo_zalloc), "di.readdwarf3.url.1",
ML_(dinfo_free),
sizeof(AddrRange) );
pair.aMin = aMin;
pair.aMax = aMax;
VG_(addToXA)( xa, &pair );
return xa;
}
/* Enumerate the address ranges starting at img-offset
'debug_ranges_offset' in .debug_ranges. Results are biased with
'svma_of_referencing_CU' and so I believe are correct SVMAs for the
object as a whole. This function allocates the XArray, and the
caller must deallocate it. */
__attribute__((noinline))
static XArray* /* of AddrRange */
get_range_list ( CUConst* cc,
Bool td3,
UWord debug_ranges_offset,
Addr svma_of_referencing_CU )
{
Addr base;
Cursor ranges;
XArray* xa; /* XArray of AddrRange */
AddrRange pair;
if (!ML_(sli_is_valid)(cc->escn_debug_ranges)
|| cc->escn_debug_ranges.szB == 0)
cc->barf("get_range_list: .debug_ranges is empty/missing");
init_Cursor( &ranges, cc->escn_debug_ranges, 0, cc->barf,
"Overrun whilst reading .debug_ranges section(2)" );
set_position_of_Cursor( &ranges, debug_ranges_offset );
/* Who frees this xa? varstack_preen() does. */
xa = VG_(newXA)( ML_(dinfo_zalloc), "di.readdwarf3.grl.1", ML_(dinfo_free),
sizeof(AddrRange) );
base = 0;
while (True) {
/* Read a (host-)word pair. This is something of a hack since
the word size to read is really dictated by the ELF file;
however, we assume we're reading a file with the same
word-sizeness as the host. Reasonably enough. */
UWord w1 = get_UWord( &ranges );
UWord w2 = get_UWord( &ranges );
if (w1 == 0 && w2 == 0)
break; /* end of list. */
if (w1 == -1UL) {
/* new value for 'base' */
base = w2;
continue;
}
/* else enumerate [w1+base, w2+base) */
/* w2 is 1 past end of range, as per D3 defn for "DW_AT_high_pc"
(sec 2.17.2) */
if (w1 > w2)
cc->barf( "negative range in .debug_ranges section" );
if (w1 < w2) {
pair.aMin = w1 + base + svma_of_referencing_CU;
pair.aMax = w2 - 1 + base + svma_of_referencing_CU;
vg_assert(pair.aMin <= pair.aMax);
VG_(addToXA)( xa, &pair );
}
}
return xa;
}
/* Parse the Compilation Unit header indicated at 'c' and
initialise 'cc' accordingly. */
static __attribute__((noinline))
void parse_CU_Header ( /*OUT*/CUConst* cc,
Bool td3,
Cursor* c,
DiSlice escn_debug_abbv,
Bool type_unit,
Bool alt_info )
{
UChar address_size;
ULong debug_abbrev_offset;
Int i;
VG_(memset)(cc, 0, sizeof(*cc));
vg_assert(c && c->barf);
cc->barf = c->barf;
/* initial_length field */
cc->unit_length
= get_Initial_Length( &cc->is_dw64, c,
"parse_CU_Header: invalid initial-length field" );
TRACE_D3(" Length: %lld\n", cc->unit_length );
/* version */
cc->version = get_UShort( c );
if (cc->version != 2 && cc->version != 3 && cc->version != 4)
cc->barf( "parse_CU_Header: is neither DWARF2 nor DWARF3 nor DWARF4" );
TRACE_D3(" Version: %d\n", (Int)cc->version );
/* debug_abbrev_offset */
debug_abbrev_offset = get_Dwarfish_UWord( c, cc->is_dw64 );
if (debug_abbrev_offset >= escn_debug_abbv.szB)
cc->barf( "parse_CU_Header: invalid debug_abbrev_offset" );
TRACE_D3(" Abbrev Offset: %lld\n", debug_abbrev_offset );
/* address size. If this isn't equal to the host word size, just
give up. This makes it safe to assume elsewhere that
DW_FORM_addr and DW_FORM_ref_addr can be treated as a host
word. */
address_size = get_UChar( c );
if (address_size != sizeof(void*))
cc->barf( "parse_CU_Header: invalid address_size" );
TRACE_D3(" Pointer Size: %d\n", (Int)address_size );
cc->is_type_unit = type_unit;
cc->is_alt_info = alt_info;
if (type_unit) {
cc->type_signature = get_ULong( c );
cc->type_offset = get_Dwarfish_UWord( c, cc->is_dw64 );
}
/* Set up cc->debug_abbv to point to the relevant table for this
CU. Set its .szB so that at least we can't read off the end of
the debug_abbrev section -- potentially (and quite likely) too
big, if this isn't the last table in the section, but at least
it's safe.
This amounts to taking debug_abbv_escn and moving the start
position along by debug_abbrev_offset bytes, hence forming a
smaller DiSlice which has the same end point. Since we checked
just above that debug_abbrev_offset is less than the size of
debug_abbv_escn, this should leave us with a nonempty slice. */
vg_assert(debug_abbrev_offset < escn_debug_abbv.szB);
cc->debug_abbv = escn_debug_abbv;
cc->debug_abbv.ioff += debug_abbrev_offset;
cc->debug_abbv.szB -= debug_abbrev_offset;
/* and empty out the set_abbv_Cursor cache */
if (0) VG_(printf)("XXXXXX initialise set_abbv_Cursor cache\n");
for (i = 0; i < N_ABBV_CACHE; i++) {
cc->saC_cache[i].abbv_code = (ULong)-1; /* unused */
cc->saC_cache[i].posn = 0;
}
cc->saC_cache_queries = 0;
cc->saC_cache_misses = 0;
}
/* Set up 'c' so it is ready to parse the abbv table entry code
'abbv_code' for this compilation unit. */
static __attribute__((noinline))
void set_abbv_Cursor ( /*OUT*/Cursor* c, Bool td3,
CUConst* cc, ULong abbv_code )
{
Int i;
ULong acode;
if (abbv_code == 0)
cc->barf("set_abbv_Cursor: abbv_code == 0" );
/* (ULong)-1 is used to represent an empty cache slot. So we can't
allow it. In any case no valid DWARF3 should make a reference
to a negative abbreviation code. [at least, they always seem to
be numbered upwards from zero as far as I have seen] */
vg_assert(abbv_code != (ULong)-1);
/* First search the cache. */
if (0) VG_(printf)("XXXXXX search set_abbv_Cursor cache\n");
cc->saC_cache_queries++;
for (i = 0; i < N_ABBV_CACHE; i++) {
/* No need to test the cached abbv_codes for -1 (empty), since
we just asserted that abbv_code is not -1. */
if (LIKELY(cc->saC_cache[i].abbv_code == abbv_code)) {
/* Found it. Set up the parser using the cached position,
and move this cache entry to the front. */
if (0) VG_(printf)("XXXXXX found in set_abbv_Cursor cache\n");
init_Cursor( c, cc->debug_abbv, cc->saC_cache[i].posn,
cc->barf,
"Overrun whilst parsing .debug_abbrev section(1)" );
if (i > 0) {
ULong t_abbv_code = cc->saC_cache[i].abbv_code;
UWord t_posn = cc->saC_cache[i].posn;
while (i > 0) {
cc->saC_cache[i] = cc->saC_cache[i-1];
i--;
}
cc->saC_cache[0].abbv_code = t_abbv_code;
cc->saC_cache[0].posn = t_posn;
}
return;
}
}
/* No. It's not in the cache. We have to search through
.debug_abbrev, of course taking care to update the cache
when done. */
cc->saC_cache_misses++;
init_Cursor( c, cc->debug_abbv, 0, cc->barf,
"Overrun whilst parsing .debug_abbrev section(2)" );
/* Now iterate though the table until we find the requested
entry. */
while (True) {
//ULong atag;
//UInt has_children;
acode = get_ULEB128( c );
if (acode == 0) break; /* end of the table */
if (acode == abbv_code) break; /* found it */
/*atag = */ get_ULEB128( c );
/*has_children = */ get_UChar( c );
//TRACE_D3(" %llu %s [%s]\n",
// acode, pp_DW_TAG(atag), pp_DW_children(has_children));
while (True) {
ULong at_name = get_ULEB128( c );
ULong at_form = get_ULEB128( c );
if (at_name == 0 && at_form == 0) break;
//TRACE_D3(" %18s %s\n",
// pp_DW_AT(at_name), pp_DW_FORM(at_form));
}
}
if (acode == 0) {
/* Not found. This is fatal. */
cc->barf("set_abbv_Cursor: abbv_code not found");
}
/* Otherwise, 'c' is now set correctly to parse the relevant entry,
starting from the abbreviation entry's tag. So just cache
the result, and return. */
for (i = N_ABBV_CACHE-1; i > N_ABBV_CACHE/2; i--) {
cc->saC_cache[i] = cc->saC_cache[i-1];
}
if (0) VG_(printf)("XXXXXX update set_abbv_Cursor cache\n");
cc->saC_cache[N_ABBV_CACHE/2].abbv_code = abbv_code;
cc->saC_cache[N_ABBV_CACHE/2].posn = get_position_of_Cursor(c);
}
/* This represents a single signatured type. It maps a type signature
(a ULong) to a cooked DIE offset. Objects of this type are stored
in the type signature hash table. */
typedef
struct D3SignatureType {
struct D3SignatureType *next;
UWord data;
ULong type_signature;
UWord die;
}
D3SignatureType;
/* Record a signatured type in the hash table. */
static void record_signatured_type ( VgHashTable tab,
ULong type_signature,
UWord die )
{
D3SignatureType *dstype = ML_(dinfo_zalloc) ( "di.readdwarf3.sigtype",
sizeof(D3SignatureType) );
dstype->data = (UWord) type_signature;
dstype->type_signature = type_signature;
dstype->die = die;
VG_(HT_add_node) ( tab, dstype );
}
/* Given a type signature hash table and a type signature, return the
cooked DIE offset of the type. If the type cannot be found, call
BARF. */
static UWord lookup_signatured_type ( VgHashTable tab,
ULong type_signature,
void (*barf)( const HChar* ) __attribute__((noreturn)) )
{
D3SignatureType *dstype = VG_(HT_lookup) ( tab, (UWord) type_signature );
/* This may be unwarranted chumminess with the hash table
implementation. */
while ( dstype != NULL && dstype->type_signature != type_signature)
dstype = dstype->next;
if (dstype == NULL) {
barf("lookup_signatured_type: could not find signatured type");
/*NOTREACHED*/
vg_assert(0);
}
return dstype->die;
}
/* Represents Form data. If szB is 1/2/4/8 then the result is in the
lowest 1/2/4/8 bytes of u.val. If szB is zero or negative then the
result is an image section beginning at u.cur and with size -szB.
No other szB values are allowed. */
typedef
struct {
Long szB; // 1, 2, 4, 8 or non-positive values only.
union { ULong val; DiCursor cur; } u;
}
FormContents;
/* From 'c', get the Form data into 'cts'. Either it gets a 1/2/4/8
byte scalar value, or (a reference to) zero or more bytes starting
at a DiCursor.*/
static
void get_Form_contents ( /*OUT*/FormContents* cts,
CUConst* cc, Cursor* c,
Bool td3, DW_FORM form )
{
VG_(bzero_inline)(cts, sizeof(*cts));
switch (form) {
case DW_FORM_data1:
cts->u.val = (ULong)(UChar)get_UChar(c);
cts->szB = 1;
TRACE_D3("%u", (UInt)cts->u.val);
break;
case DW_FORM_data2:
cts->u.val = (ULong)(UShort)get_UShort(c);
cts->szB = 2;
TRACE_D3("%u", (UInt)cts->u.val);
break;
case DW_FORM_data4:
cts->u.val = (ULong)(UInt)get_UInt(c);
cts->szB = 4;
TRACE_D3("%u", (UInt)cts->u.val);
break;
case DW_FORM_data8:
cts->u.val = get_ULong(c);
cts->szB = 8;
TRACE_D3("%llu", cts->u.val);
break;
case DW_FORM_sec_offset:
cts->u.val = (ULong)get_Dwarfish_UWord( c, cc->is_dw64 );
cts->szB = cc->is_dw64 ? 8 : 4;
TRACE_D3("%llu", cts->u.val);
break;
case DW_FORM_sdata:
cts->u.val = (ULong)(Long)get_SLEB128(c);
cts->szB = 8;
TRACE_D3("%lld", (Long)cts->u.val);
break;
case DW_FORM_udata:
cts->u.val = (ULong)(Long)get_ULEB128(c);
cts->szB = 8;
TRACE_D3("%llu", (Long)cts->u.val);
break;
case DW_FORM_addr:
/* note, this is a hack. DW_FORM_addr is defined as getting
a word the size of the target machine as defined by the
address_size field in the CU Header. However,
parse_CU_Header() rejects all inputs except those for
which address_size == sizeof(Word), hence we can just
treat it as a (host) Word. */
cts->u.val = (ULong)(UWord)get_UWord(c);
cts->szB = sizeof(UWord);
TRACE_D3("0x%lx", (UWord)cts->u.val);
break;
case DW_FORM_ref_addr:
/* We make the same word-size assumption as DW_FORM_addr. */
/* What does this really mean? From D3 Sec 7.5.4,
description of "reference", it would appear to reference
some other DIE, by specifying the offset from the
beginning of a .debug_info section. The D3 spec mentions
that this might be in some other shared object and
executable. But I don't see how the name of the other
object/exe is specified.
At least for the DW_FORM_ref_addrs created by icc11, the
references seem to be within the same object/executable.
So for the moment we merely range-check, to see that they
actually do specify a plausible offset within this
object's .debug_info, and return the value unchanged.
In DWARF 2, DW_FORM_ref_addr is address-sized, but in
DWARF 3 and later, it is offset-sized.
*/
if (cc->version == 2) {
cts->u.val = (ULong)(UWord)get_UWord(c);
cts->szB = sizeof(UWord);
} else {
cts->u.val = get_Dwarfish_UWord(c, cc->is_dw64);
cts->szB = cc->is_dw64 ? sizeof(ULong) : sizeof(UInt);
}
TRACE_D3("0x%lx", (UWord)cts->u.val);
if (0) VG_(printf)("DW_FORM_ref_addr 0x%lx\n", (UWord)cts->u.val);
if (/* the following is surely impossible, but ... */
!ML_(sli_is_valid)(cc->escn_debug_info)
|| cts->u.val >= (ULong)cc->escn_debug_info.szB) {
/* Hmm. Offset is nonsensical for this object's .debug_info
section. Be safe and reject it. */
cc->barf("get_Form_contents: DW_FORM_ref_addr points "
"outside .debug_info");
}
break;
case DW_FORM_strp: {
/* this is an offset into .debug_str */
UWord uw = (UWord)get_Dwarfish_UWord( c, cc->is_dw64 );
if (!ML_(sli_is_valid)(cc->escn_debug_str)
|| uw >= cc->escn_debug_str.szB)
cc->barf("get_Form_contents: DW_FORM_strp "
"points outside .debug_str");
/* FIXME: check the entire string lies inside debug_str,
not just the first byte of it. */
DiCursor str
= ML_(cur_plus)( ML_(cur_from_sli)(cc->escn_debug_str), uw );
if (td3) {
HChar* tmp = ML_(cur_read_strdup)(str, "di.getFC.1");
TRACE_D3("(indirect string, offset: 0x%lx): %s", uw, tmp);
ML_(dinfo_free)(tmp);
}
cts->u.cur = str;
cts->szB = - (Long)(1 + (ULong)ML_(cur_strlen)(str));
break;
}
case DW_FORM_string: {
DiCursor str = get_AsciiZ(c);
if (td3) {
HChar* tmp = ML_(cur_read_strdup)(str, "di.getFC.2");
TRACE_D3("%s", tmp);
ML_(dinfo_free)(tmp);
}
cts->u.cur = str;
/* strlen is safe because get_AsciiZ already 'vetted' the
entire string */
cts->szB = - (Long)(1 + (ULong)ML_(cur_strlen)(str));
break;
}
case DW_FORM_ref1: {
UChar u8 = get_UChar(c);
UWord res = cc->cu_start_offset + (UWord)u8;
cts->u.val = (ULong)res;
cts->szB = sizeof(UWord);
TRACE_D3("<%lx>", res);
break;
}
case DW_FORM_ref2: {
UShort u16 = get_UShort(c);
UWord res = cc->cu_start_offset + (UWord)u16;
cts->u.val = (ULong)res;
cts->szB = sizeof(UWord);
TRACE_D3("<%lx>", res);
break;
}
case DW_FORM_ref4: {
UInt u32 = get_UInt(c);
UWord res = cc->cu_start_offset + (UWord)u32;
cts->u.val = (ULong)res;
cts->szB = sizeof(UWord);
TRACE_D3("<%lx>", res);
break;
}
case DW_FORM_ref8: {
ULong u64 = get_ULong(c);
UWord res = cc->cu_start_offset + (UWord)u64;
cts->u.val = (ULong)res;
cts->szB = sizeof(UWord);
TRACE_D3("<%lx>", res);
break;
}
case DW_FORM_ref_udata: {
ULong u64 = get_ULEB128(c);
UWord res = cc->cu_start_offset + (UWord)u64;
cts->u.val = (ULong)res;
cts->szB = sizeof(UWord);
TRACE_D3("<%lx>", res);
break;
}
case DW_FORM_flag: {
UChar u8 = get_UChar(c);
TRACE_D3("%u", (UInt)u8);
cts->u.val = (ULong)u8;
cts->szB = 1;
break;
}
case DW_FORM_flag_present:
TRACE_D3("1");
cts->u.val = 1;
cts->szB = 1;
break;
case DW_FORM_block1: {
ULong u64b;
ULong u64 = (ULong)get_UChar(c);
DiCursor block = get_DiCursor_from_Cursor(c);
TRACE_D3("%llu byte block: ", u64);
for (u64b = u64; u64b > 0; u64b--) {
UChar u8 = get_UChar(c);
TRACE_D3("%x ", (UInt)u8);
}
cts->u.cur = block;
cts->szB = - (Long)u64;
break;
}
case DW_FORM_block2: {
ULong u64b;
ULong u64 = (ULong)get_UShort(c);
DiCursor block = get_DiCursor_from_Cursor(c);
TRACE_D3("%llu byte block: ", u64);
for (u64b = u64; u64b > 0; u64b--) {
UChar u8 = get_UChar(c);
TRACE_D3("%x ", (UInt)u8);
}
cts->u.cur = block;
cts->szB = - (Long)u64;
break;
}
case DW_FORM_block4: {
ULong u64b;
ULong u64 = (ULong)get_UInt(c);
DiCursor block = get_DiCursor_from_Cursor(c);
TRACE_D3("%llu byte block: ", u64);
for (u64b = u64; u64b > 0; u64b--) {
UChar u8 = get_UChar(c);
TRACE_D3("%x ", (UInt)u8);
}
cts->u.cur = block;
cts->szB = - (Long)u64;
break;
}
case DW_FORM_exprloc:
case DW_FORM_block: {
ULong u64b;
ULong u64 = (ULong)get_ULEB128(c);
DiCursor block = get_DiCursor_from_Cursor(c);
TRACE_D3("%llu byte block: ", u64);
for (u64b = u64; u64b > 0; u64b--) {
UChar u8 = get_UChar(c);
TRACE_D3("%x ", (UInt)u8);
}
cts->u.cur = block;
cts->szB = - (Long)u64;
break;
}
case DW_FORM_ref_sig8: {
ULong u64b;
ULong signature = get_ULong (c);
ULong work = signature;
TRACE_D3("8 byte signature: ");
for (u64b = 8; u64b > 0; u64b--) {
UChar u8 = work & 0xff;
TRACE_D3("%x ", (UInt)u8);
work >>= 8;
}
/* Due to the way that the hash table is constructed, the
resulting DIE offset here is already "cooked". See
cook_die_using_form. */
cts->u.val = lookup_signatured_type (cc->signature_types, signature,
c->barf);
cts->szB = sizeof(UWord);
break;
}
case DW_FORM_indirect:
get_Form_contents (cts, cc, c, td3, (DW_FORM)get_ULEB128(c));
return;
case DW_FORM_GNU_ref_alt:
cts->u.val = get_Dwarfish_UWord(c, cc->is_dw64);
cts->szB = cc->is_dw64 ? sizeof(ULong) : sizeof(UInt);
TRACE_D3("0x%lx", (UWord)cts->u.val);
if (0) VG_(printf)("DW_FORM_GNU_ref_alt 0x%lx\n", (UWord)cts->u.val);
if (/* the following is surely impossible, but ... */
!ML_(sli_is_valid)(cc->escn_debug_info_alt)
|| cts->u.val >= (ULong)cc->escn_debug_info_alt.szB) {
/* Hmm. Offset is nonsensical for this object's .debug_info
section. Be safe and reject it. */
cc->barf("get_Form_contents: DW_FORM_ref_addr points "
"outside alternate .debug_info");
}
break;
case DW_FORM_GNU_strp_alt: {
/* this is an offset into alternate .debug_str */
SizeT uw = (UWord)get_Dwarfish_UWord( c, cc->is_dw64 );
if (!ML_(sli_is_valid)(cc->escn_debug_str_alt)
|| uw >= cc->escn_debug_str_alt.szB)
cc->barf("get_Form_contents: DW_FORM_GNU_strp_alt "
"points outside alternate .debug_str");
/* FIXME: check the entire string lies inside debug_str,
not just the first byte of it. */
DiCursor str
= ML_(cur_plus)( ML_(cur_from_sli)(cc->escn_debug_str_alt), uw);
if (td3) {
HChar* tmp = ML_(cur_read_strdup)(str, "di.getFC.3");
TRACE_D3("(indirect alt string, offset: 0x%lx): %s", uw, tmp);
ML_(dinfo_free)(tmp);
}
cts->u.cur = str;
cts->szB = - (Long)(1 + (ULong)ML_(cur_strlen)(str));
break;
}
default:
VG_(printf)(
"get_Form_contents: unhandled %d (%s) at <%llx>\n",
form, ML_(pp_DW_FORM)(form), get_position_of_Cursor(c));
c->barf("get_Form_contents: unhandled DW_FORM");
}
}
/*------------------------------------------------------------*/
/*--- ---*/
/*--- Parsing of variable-related DIEs ---*/
/*--- ---*/
/*------------------------------------------------------------*/
typedef
struct _TempVar {
HChar* name; /* in DebugInfo's .strchunks */
/* Represent ranges economically. nRanges is the number of
ranges. Cases:
0: .rngOneMin .rngOneMax .manyRanges are all zero
1: .rngOneMin .rngOneMax hold the range; .rngMany is NULL
2: .rngOneMin .rngOneMax are zero; .rngMany holds the ranges.
This is merely an optimisation to avoid having to allocate
and free the XArray in the common (98%) of cases where there
is zero or one address ranges. */
UWord nRanges;
Addr rngOneMin;
Addr rngOneMax;
XArray* rngMany; /* of AddrRange. NON-UNIQUE PTR in AR_DINFO. */
/* Do not free .rngMany, since many TempVars will have the same
value. Instead the associated storage is to be freed by
deleting 'rangetree', which stores a single copy of each
range. */
/* --- */
Int level;
UWord typeR; /* a cuOff */
GExpr* gexpr; /* for this variable */
GExpr* fbGX; /* to find the frame base of the enclosing fn, if
any */
HChar* fName; /* declaring file name, or NULL */
Int fLine; /* declaring file line number, or zero */
/* offset in .debug_info, so that abstract instances can be
found to satisfy references from concrete instances. */
UWord dioff;
UWord absOri; /* so the absOri fields refer to dioff fields
in some other, related TempVar. */
}
TempVar;
#define N_D3_VAR_STACK 48
typedef
struct {
/* Contains the range stack: a stack of address ranges, one
stack entry for each nested scope.
Some scope entries are created by function definitions
(DW_AT_subprogram), and for those, we also note the GExpr
derived from its DW_AT_frame_base attribute, if any.
Consequently it should be possible to find, for any
variable's DIE, the GExpr for the the containing function's
DW_AT_frame_base by scanning back through the stack to find
the nearest entry associated with a function. This somewhat
elaborate scheme is provided so as to make it possible to
obtain the correct DW_AT_frame_base expression even in the
presence of nested functions (or to be more precise, in the
presence of nested DW_AT_subprogram DIEs).
*/
Int sp; /* [sp] is innermost active entry; sp==-1 for empty
stack */
XArray* ranges[N_D3_VAR_STACK]; /* XArray of AddrRange */
Int level[N_D3_VAR_STACK]; /* D3 DIE levels */
Bool isFunc[N_D3_VAR_STACK]; /* from DW_AT_subprogram? */
GExpr* fbGX[N_D3_VAR_STACK]; /* if isFunc, contains the FB
expr, else NULL */
/* The file name table. Is a mapping from integer index to the
(permanent) copy of the string in in DebugInfo's .strchunks. */
XArray* /* of UChar* */ filenameTable;
}
D3VarParser;
static void varstack_show ( D3VarParser* parser, const HChar* str ) {
Word i, j;
VG_(printf)(" varstack (%s) {\n", str);
for (i = 0; i <= parser->sp; i++) {
XArray* xa = parser->ranges[i];
vg_assert(xa);
VG_(printf)(" [%ld] (level %d)", i, parser->level[i]);
if (parser->isFunc[i]) {
VG_(printf)(" (fbGX=%p)", parser->fbGX[i]);
} else {
vg_assert(parser->fbGX[i] == NULL);
}
VG_(printf)(": ");
if (VG_(sizeXA)( xa ) == 0) {
VG_(printf)("** empty PC range array **");
} else {
for (j = 0; j < VG_(sizeXA)( xa ); j++) {
AddrRange* range = (AddrRange*) VG_(indexXA)( xa, j );
vg_assert(range);
VG_(printf)("[%#lx,%#lx] ", range->aMin, range->aMax);
}
}
VG_(printf)("\n");
}
VG_(printf)(" }\n");
}
/* Remove from the stack, all entries with .level > 'level' */
static
void varstack_preen ( D3VarParser* parser, Bool td3, Int level )
{
Bool changed = False;
vg_assert(parser->sp < N_D3_VAR_STACK);
while (True) {
vg_assert(parser->sp >= -1);
if (parser->sp == -1) break;
if (parser->level[parser->sp] <= level) break;
if (0)
TRACE_D3("BBBBAAAA varstack_pop [newsp=%d]\n", parser->sp-1);
vg_assert(parser->ranges[parser->sp]);
/* Who allocated this xa? get_range_list() or
unitary_range_list(). */
VG_(deleteXA)( parser->ranges[parser->sp] );
parser->ranges[parser->sp] = NULL;
parser->level[parser->sp] = 0;
parser->isFunc[parser->sp] = False;
parser->fbGX[parser->sp] = NULL;
parser->sp--;
changed = True;
}
if (changed && td3)
varstack_show( parser, "after preen" );
}
static void varstack_push ( CUConst* cc,
D3VarParser* parser,
Bool td3,
XArray* ranges, Int level,
Bool isFunc, GExpr* fbGX ) {
if (0)
TRACE_D3("BBBBAAAA varstack_push[newsp=%d]: %d %p\n",
parser->sp+1, level, ranges);
/* First we need to zap everything >= 'level', as we are about to
replace any previous entry at 'level', so .. */
varstack_preen(parser, /*td3*/False, level-1);
vg_assert(parser->sp >= -1);
vg_assert(parser->sp < N_D3_VAR_STACK);
if (parser->sp == N_D3_VAR_STACK-1)
cc->barf("varstack_push: N_D3_VAR_STACK is too low; "
"increase and recompile");
if (parser->sp >= 0)
vg_assert(parser->level[parser->sp] < level);
parser->sp++;
vg_assert(parser->ranges[parser->sp] == NULL);
vg_assert(parser->level[parser->sp] == 0);
vg_assert(parser->isFunc[parser->sp] == False);
vg_assert(parser->fbGX[parser->sp] == NULL);
vg_assert(ranges != NULL);
if (!isFunc) vg_assert(fbGX == NULL);
parser->ranges[parser->sp] = ranges;
parser->level[parser->sp] = level;
parser->isFunc[parser->sp] = isFunc;
parser->fbGX[parser->sp] = fbGX;
if (td3)
varstack_show( parser, "after push" );
}
/* cts is derived from a DW_AT_location and so refers either to a
location expression or to a location list. Figure out which, and
in both cases bundle the expression or location list into a
so-called GExpr (guarded expression). */
__attribute__((noinline))
static GExpr* get_GX ( CUConst* cc, Bool td3, const FormContents* cts )
{
GExpr* gexpr = NULL;
if (cts->szB < 0) {
/* represents a non-empty in-line location expression, and
cts->u.cur points at the image bytes */
gexpr = make_singleton_GX( cts->u.cur, (ULong)(- cts->szB) );
}
else
if (cts->szB > 0) {
/* represents a location list. cts->u.val is the offset of it
in .debug_loc. */
if (!cc->cu_svma_known)
cc->barf("get_GX: location list, but CU svma is unknown");
gexpr = make_general_GX( cc, td3, cts->u.val, cc->cu_svma );
}
else {
vg_assert(0); /* else caller is bogus */
}
return gexpr;
}
static
void read_filename_table( /*MOD*/D3VarParser* parser,
CUConst* cc, ULong debug_line_offset,
Bool td3 )
{
Bool is_dw64;
Cursor c;
Word i;
UShort version;
UChar opcode_base;
HChar* str;
vg_assert(parser && cc && cc->barf);
if (!ML_(sli_is_valid)(cc->escn_debug_line)
|| cc->escn_debug_line.szB <= debug_line_offset) {
cc->barf("read_filename_table: .debug_line is missing?");
}
init_Cursor( &c, cc->escn_debug_line, debug_line_offset, cc->barf,
"Overrun whilst reading .debug_line section(1)" );
/* unit_length = */
get_Initial_Length( &is_dw64, &c,
"read_filename_table: invalid initial-length field" );
version = get_UShort( &c );
if (version != 2 && version != 3 && version != 4)
cc->barf("read_filename_table: Only DWARF version 2, 3 and 4 line info "
"is currently supported.");
/*header_length = (ULong)*/ get_Dwarfish_UWord( &c, is_dw64 );
/*minimum_instruction_length = */ get_UChar( &c );
if (version >= 4)
/*maximum_operations_per_insn = */ get_UChar( &c );
/*default_is_stmt = */ get_UChar( &c );
/*line_base = (Char)*/ get_UChar( &c );
/*line_range = */ get_UChar( &c );
opcode_base = get_UChar( &c );
/* skip over "standard_opcode_lengths" */
for (i = 1; i < (Word)opcode_base; i++)
(void)get_UChar( &c );
/* skip over the directory names table */
while (peek_UChar(&c) != 0) {
(void)get_AsciiZ(&c);
}
(void)get_UChar(&c); /* skip terminating zero */
/* Read and record the file names table */
vg_assert(parser->filenameTable);
vg_assert( VG_(sizeXA)( parser->filenameTable ) == 0 );
/* Add a dummy index-zero entry. DWARF3 numbers its files
from 1, for some reason. */
str = ML_(addStr)( cc->di, "<unknown_file>", -1 );
VG_(addToXA)( parser->filenameTable, &str );
while (peek_UChar(&c) != 0) {
DiCursor cur = get_AsciiZ(&c);
str = ML_(addStrFromCursor)( cc->di, cur );
TRACE_D3(" read_filename_table: %ld %s\n",
VG_(sizeXA)(parser->filenameTable), str);
VG_(addToXA)( parser->filenameTable, &str );
(void)get_ULEB128( &c ); /* skip directory index # */
(void)get_ULEB128( &c ); /* skip last mod time */
(void)get_ULEB128( &c ); /* file size */
}
/* We're done! The rest of it is not interesting. */
}
__attribute__((noinline))
static void bad_DIE_confusion(int linenr)
{
VG_(printf)("\nparse_var_DIE(%d): confused by:\n", linenr);
}
#define goto_bad_DIE do {bad_DIE_confusion(__LINE__); goto bad_DIE;} while (0)
__attribute__((noinline))
static void parse_var_DIE (
/*MOD*/WordFM* /* of (XArray* of AddrRange, void) */ rangestree,
/*MOD*/XArray* /* of TempVar* */ tempvars,
/*MOD*/XArray* /* of GExpr* */ gexprs,
/*MOD*/D3VarParser* parser,
DW_TAG dtag,
UWord posn,
Int level,
Cursor* c_die,
Cursor* c_abbv,
CUConst* cc,
Bool td3
)
{
FormContents cts;
UWord saved_die_c_offset = get_position_of_Cursor( c_die );
UWord saved_abbv_c_offset = get_position_of_Cursor( c_abbv );
Bool debug_types_flag;
Bool alt_flag;
varstack_preen( parser, td3, level-1 );
if (dtag == DW_TAG_compile_unit
|| dtag == DW_TAG_type_unit
|| dtag == DW_TAG_partial_unit) {
Bool have_lo = False;
Bool have_hi1 = False;
Bool hiIsRelative = False;
Bool have_range = False;
Addr ip_lo = 0;
Addr ip_hi1 = 0;
Addr rangeoff = 0;
while (True) {
DW_AT attr = (DW_AT) get_ULEB128( c_abbv );
DW_FORM form = (DW_FORM)get_ULEB128( c_abbv );
if (attr == 0 && form == 0) break;
get_Form_contents( &cts, cc, c_die, False/*td3*/, form );
if (attr == DW_AT_low_pc && cts.szB > 0) {
ip_lo = cts.u.val;
have_lo = True;
}
if (attr == DW_AT_high_pc && cts.szB > 0) {
ip_hi1 = cts.u.val;
have_hi1 = True;
if (form != DW_FORM_addr)
hiIsRelative = True;
}
if (attr == DW_AT_ranges && cts.szB > 0) {
rangeoff = cts.u.val;
have_range = True;
}
if (attr == DW_AT_stmt_list && cts.szB > 0) {
read_filename_table( parser, cc, cts.u.val, td3 );
}
}
if (have_lo && have_hi1 && hiIsRelative)
ip_hi1 += ip_lo;
/* Now, does this give us an opportunity to find this
CU's svma? */
#if 0
if (level == 0 && have_lo) {
vg_assert(!cc->cu_svma_known); /* if this fails, it must be
because we've already seen a DW_TAG_compile_unit DIE at level
0. But that can't happen, because DWARF3 only allows exactly
one top level DIE per CU. */
cc->cu_svma_known = True;
cc->cu_svma = ip_lo;
if (1)
TRACE_D3("BBBBAAAA acquire CU_SVMA of %p\n", cc->cu_svma);
/* Now, it may be that this DIE doesn't tell us the CU's
SVMA, by way of not having a DW_AT_low_pc. That's OK --
the CU doesn't *have* to have its SVMA specified.
But as per last para D3 spec sec 3.1.1 ("Normal and
Partial Compilation Unit Entries", "If the base address
(viz, the SVMA) is undefined, then any DWARF entry of
structure defined interms of the base address of that
compilation unit is not valid.". So that means, if whilst
processing the children of this top level DIE (or their
children, etc) we see a DW_AT_range, and cu_svma_known is
False, then the DIE that contains it is (per the spec)
invalid, and we can legitimately stop and complain. */
}
#else
/* .. whereas The Reality is, simply assume the SVMA is zero
if it isn't specified. */
if (level == 0) {
vg_assert(!cc->cu_svma_known);
cc->cu_svma_known = True;
if (have_lo)
cc->cu_svma = ip_lo;
else
cc->cu_svma = 0;
}
#endif
/* Do we have something that looks sane? */
if (have_lo && have_hi1 && (!have_range)) {
if (ip_lo < ip_hi1)
varstack_push( cc, parser, td3,
unitary_range_list(ip_lo, ip_hi1 - 1),
level,
False/*isFunc*/, NULL/*fbGX*/ );
else if (ip_lo == 0 && ip_hi1 == 0)
/* CU has no code, presumably?
Such situations have been encountered for code
compiled with -ffunction-sections -fdata-sections
and linked with --gc-sections. Completely
eliminated CU gives such 0 lo/hi pc. Similarly
to a CU which has no lo/hi/range pc, we push
an empty range list. */
varstack_push( cc, parser, td3,
empty_range_list(),
level,
False/*isFunc*/, NULL/*fbGX*/ );
} else
if ((!have_lo) && (!have_hi1) && have_range) {
varstack_push( cc, parser, td3,
get_range_list( cc, td3,
rangeoff, cc->cu_svma ),
level,
False/*isFunc*/, NULL/*fbGX*/ );
} else
if ((!have_lo) && (!have_hi1) && (!have_range)) {
/* CU has no code, presumably? */
varstack_push( cc, parser, td3,
empty_range_list(),
level,
False/*isFunc*/, NULL/*fbGX*/ );
} else
if (have_lo && (!have_hi1) && have_range && ip_lo == 0) {
/* broken DIE created by gcc-4.3.X ? Ignore the
apparently-redundant DW_AT_low_pc and use the DW_AT_ranges
instead. */
varstack_push( cc, parser, td3,
get_range_list( cc, td3,
rangeoff, cc->cu_svma ),
level,
False/*isFunc*/, NULL/*fbGX*/ );
} else {
if (0) VG_(printf)("I got hlo %d hhi1 %d hrange %d\n",
(Int)have_lo, (Int)have_hi1, (Int)have_range);
goto_bad_DIE;
}
}
if (dtag == DW_TAG_lexical_block || dtag == DW_TAG_subprogram) {
Bool have_lo = False;
Bool have_hi1 = False;
Bool have_range = False;
Bool hiIsRelative = False;
Addr ip_lo = 0;
Addr ip_hi1 = 0;
Addr rangeoff = 0;
Bool isFunc = dtag == DW_TAG_subprogram;
GExpr* fbGX = NULL;
while (True) {
DW_AT attr = (DW_AT) get_ULEB128( c_abbv );
DW_FORM form = (DW_FORM)get_ULEB128( c_abbv );
if (attr == 0 && form == 0) break;
get_Form_contents( &cts, cc, c_die, False/*td3*/, form );
if (attr == DW_AT_low_pc && cts.szB > 0) {
ip_lo = cts.u.val;
have_lo = True;
}
if (attr == DW_AT_high_pc && cts.szB > 0) {
ip_hi1 = cts.u.val;
have_hi1 = True;
if (form != DW_FORM_addr)
hiIsRelative = True;
}
if (attr == DW_AT_ranges && cts.szB > 0) {
rangeoff = cts.u.val;
have_range = True;
}
if (isFunc
&& attr == DW_AT_frame_base
&& cts.szB != 0 /* either scalar or nonempty block */) {
fbGX = get_GX( cc, False/*td3*/, &cts );
vg_assert(fbGX);
VG_(addToXA)(gexprs, &fbGX);
}
}
if (have_lo && have_hi1 && hiIsRelative)
ip_hi1 += ip_lo;
/* Do we have something that looks sane? */
if (dtag == DW_TAG_subprogram
&& (!have_lo) && (!have_hi1) && (!have_range)) {
/* This is legit - ignore it. Sec 3.3.3: "A subroutine entry
representing a subroutine declaration that is not also a
definition does not have code address or range
attributes." */
} else
if (dtag == DW_TAG_lexical_block
&& (!have_lo) && (!have_hi1) && (!have_range)) {
/* I believe this is legit, and means the lexical block
contains no insns (whatever that might mean). Ignore. */
} else
if (have_lo && have_hi1 && (!have_range)) {
/* This scope supplies just a single address range. */
if (ip_lo < ip_hi1)
varstack_push( cc, parser, td3,
unitary_range_list(ip_lo, ip_hi1 - 1),
level, isFunc, fbGX );
} else
if ((!have_lo) && (!have_hi1) && have_range) {
/* This scope supplies multiple address ranges via the use of
a range list. */
varstack_push( cc, parser, td3,
get_range_list( cc, td3,
rangeoff, cc->cu_svma ),
level, isFunc, fbGX );
} else
if (have_lo && (!have_hi1) && (!have_range)) {
/* This scope is bogus. The D3 spec sec 3.4 (Lexical Block
Entries) says fairly clearly that a scope must have either
_range or (_low_pc and _high_pc). */
/* The spec is a bit ambiguous though. Perhaps a single byte
range is intended? See sec 2.17 (Code Addresses And Ranges) */
/* This case is here because icc9 produced this:
<2><13bd>: DW_TAG_lexical_block
DW_AT_decl_line : 5229
DW_AT_decl_column : 37
DW_AT_decl_file : 1
DW_AT_low_pc : 0x401b03
*/
/* Ignore (seems safe than pushing a single byte range) */
} else
goto_bad_DIE;
}
if (dtag == DW_TAG_variable || dtag == DW_TAG_formal_parameter) {
HChar* name = NULL;
UWord typeR = D3_INVALID_CUOFF;
Bool global = False;
GExpr* gexpr = NULL;
Int n_attrs = 0;
UWord abs_ori = (UWord)D3_INVALID_CUOFF;
Int lineNo = 0;
HChar* fileName = NULL;
while (True) {
DW_AT attr = (DW_AT) get_ULEB128( c_abbv );
DW_FORM form = (DW_FORM)get_ULEB128( c_abbv );
if (attr == 0 && form == 0) break;
get_Form_contents( &cts, cc, c_die, False/*td3*/, form );
n_attrs++;
if (attr == DW_AT_name && cts.szB < 0) {
name = ML_(addStrFromCursor)( cc->di, cts.u.cur );
}
if (attr == DW_AT_location
&& cts.szB != 0 /* either scalar or nonempty block */) {
gexpr = get_GX( cc, False/*td3*/, &cts );
vg_assert(gexpr);
VG_(addToXA)(gexprs, &gexpr);
}
if (attr == DW_AT_type && cts.szB > 0) {
typeR = cook_die_using_form( cc, cts.u.val, form );
}
if (attr == DW_AT_external && cts.szB > 0 && cts.u.val > 0) {
global = True;
}
if (attr == DW_AT_abstract_origin && cts.szB > 0) {
abs_ori = (UWord)cts.u.val;
}
if (attr == DW_AT_declaration && cts.szB > 0 && cts.u.val > 0) {
/*declaration = True;*/
}
if (attr == DW_AT_decl_line && cts.szB > 0) {
lineNo = (Int)cts.u.val;
}
if (attr == DW_AT_decl_file && cts.szB > 0) {
Int ftabIx = (Int)cts.u.val;
if (ftabIx >= 1
&& ftabIx < VG_(sizeXA)( parser->filenameTable )) {
fileName = *(HChar**)
VG_(indexXA)( parser->filenameTable, ftabIx );
vg_assert(fileName);
}
if (0) VG_(printf)("XXX filename = %s\n", fileName);
}
}
if (!global && dtag == DW_TAG_variable && level == 1) {
/* Case of a static variable. It is better to declare
it global as the variable is not really related to
a PC range, as its address can be used by program
counters outside of the ranges where it is visible . */
global = True;
}
/* We'll collect it under if one of the following three
conditions holds:
(1) has location and type -> completed
(2) has type only -> is an abstract instance
(3) has location and abs_ori -> is a concrete instance
Name, filename and line number are all optional frills.
*/
if ( /* 1 */ (gexpr && typeR != D3_INVALID_CUOFF)
/* 2 */ || (typeR != D3_INVALID_CUOFF)
/* 3 */ || (gexpr && abs_ori != (UWord)D3_INVALID_CUOFF) ) {
/* Add this variable to the list of interesting looking
variables. Crucially, note along with it the address
range(s) associated with the variable, which for locals
will be the address ranges at the top of the varparser's
stack. */
GExpr* fbGX = NULL;
Word i, nRanges;
XArray* /* of AddrRange */ xa;
TempVar* tv;
/* Stack can't be empty; we put a dummy entry on it for the
entire address range before starting with the DIEs for
this CU. */
vg_assert(parser->sp >= 0);
/* If this is a local variable (non-global), try to find
the GExpr for the DW_AT_frame_base of the containing
function. It should have been pushed on the stack at the
time we encountered its DW_TAG_subprogram DIE, so the way
to find it is to scan back down the stack looking for it.
If there isn't an enclosing stack entry marked 'isFunc'
then we must be seeing variable or formal param DIEs
outside of a function, so we deem the Dwarf to be
malformed if that happens. Note that the fbGX may be NULL
if the containing DT_TAG_subprogram didn't supply a
DW_AT_frame_base -- that's OK, but there must actually be
a containing DW_TAG_subprogram. */
if (!global) {
Bool found = False;
for (i = parser->sp; i >= 0; i--) {
if (parser->isFunc[i]) {
fbGX = parser->fbGX[i];
found = True;
break;
}
}
if (!found) {
if (0 && VG_(clo_verbosity) >= 0) {
VG_(message)(Vg_DebugMsg,
"warning: parse_var_DIE: non-global variable "
"outside DW_TAG_subprogram\n");
}
/* goto_bad_DIE; */
/* This seems to happen a lot. Just ignore it -- if,
when we come to evaluation of the location (guarded)
expression, it requires a frame base value, and
there's no expression for that, then evaluation as a
whole will fail. Harmless - a bit of a waste of
cycles but nothing more. */
}
}
/* re "global ? 0 : parser->sp" (twice), if the var is
marked 'global' then we must put it at the global scope,
as only the global scope (level 0) covers the entire PC
address space. It is asserted elsewhere that level 0
always covers the entire address space. */
xa = parser->ranges[global ? 0 : parser->sp];
nRanges = VG_(sizeXA)(xa);
vg_assert(nRanges >= 0);
tv = ML_(dinfo_zalloc)( "di.readdwarf3.pvD.1", sizeof(TempVar) );
tv->name = name;
tv->level = global ? 0 : parser->sp;
tv->typeR = typeR;
tv->gexpr = gexpr;
tv->fbGX = fbGX;
tv->fName = fileName;
tv->fLine = lineNo;
tv->dioff = posn;
tv->absOri = abs_ori;
/* See explanation on definition of type TempVar for the
reason for this elaboration. */
tv->nRanges = nRanges;
tv->rngOneMin = 0;
tv->rngOneMax = 0;
tv->rngMany = NULL;
if (nRanges == 1) {
AddrRange* range = VG_(indexXA)(xa, 0);
tv->rngOneMin = range->aMin;
tv->rngOneMax = range->aMax;
}
else if (nRanges > 1) {
/* See if we already have a range list which is
structurally identical. If so, use that; if not, clone
this one, and add it to our collection. */
UWord keyW, valW;
if (VG_(lookupFM)( rangestree, &keyW, &valW, (UWord)xa )) {
XArray* old = (XArray*)keyW;
tl_assert(valW == 0);
tl_assert(old != xa);
tv->rngMany = old;
} else {
XArray* cloned = VG_(cloneXA)( "di.readdwarf3.pvD.2", xa );
tv->rngMany = cloned;
VG_(addToFM)( rangestree, (UWord)cloned, 0 );
}
}
VG_(addToXA)( tempvars, &tv );
TRACE_D3(" Recording this variable, with %ld PC range(s)\n",
VG_(sizeXA)(xa) );
/* collect stats on how effective the ->ranges special
casing is */
if (0) {
static Int ntot=0, ngt=0;
ntot++;
if (tv->rngMany) ngt++;
if (0 == (ntot % 100000))
VG_(printf)("XXXX %d tot, %d cloned\n", ntot, ngt);
}
}
/* Here are some other weird cases seen in the wild:
We have a variable with a name and a type, but no
location. I guess that's a sign that it has been
optimised away. Ignore it. Here's an example:
static Int lc_compar(void* n1, void* n2) {
MC_Chunk* mc1 = *(MC_Chunk**)n1;
MC_Chunk* mc2 = *(MC_Chunk**)n2;
return (mc1->data < mc2->data ? -1 : 1);
}
Both mc1 and mc2 are like this
<2><5bc>: Abbrev Number: 21 (DW_TAG_variable)
DW_AT_name : mc1
DW_AT_decl_file : 1
DW_AT_decl_line : 216
DW_AT_type : <5d3>
whereas n1 and n2 do have locations specified.
---------------------------------------------
We see a DW_TAG_formal_parameter with a type, but
no name and no location. It's probably part of a function type
construction, thusly, hence ignore it:
<1><2b4>: Abbrev Number: 12 (DW_TAG_subroutine_type)
DW_AT_sibling : <2c9>
DW_AT_prototyped : 1
DW_AT_type : <114>
<2><2be>: Abbrev Number: 13 (DW_TAG_formal_parameter)
DW_AT_type : <13e>
<2><2c3>: Abbrev Number: 13 (DW_TAG_formal_parameter)
DW_AT_type : <133>
---------------------------------------------
Is very minimal, like this:
<4><81d>: Abbrev Number: 44 (DW_TAG_variable)
DW_AT_abstract_origin: <7ba>
What that signifies I have no idea. Ignore.
----------------------------------------------
Is very minimal, like this:
<200f>: DW_TAG_formal_parameter
DW_AT_abstract_ori: <1f4c>
DW_AT_location : 13440
What that signifies I have no idea. Ignore.
It might be significant, though: the variable at least
has a location and so might exist somewhere.
Maybe we should handle this.
---------------------------------------------
<22407>: DW_TAG_variable
DW_AT_name : (indirect string, offset: 0x6579):
vgPlain_trampoline_stuff_start
DW_AT_decl_file : 29
DW_AT_decl_line : 56
DW_AT_external : 1
DW_AT_declaration : 1
Nameless and typeless variable that has a location? Who
knows. Not me.
<2><3d178>: Abbrev Number: 22 (DW_TAG_variable)
DW_AT_location : 9 byte block: 3 c0 c7 13 38 0 0 0 0
(DW_OP_addr: 3813c7c0)
No, really. Check it out. gcc is quite simply borked.
<3><168cc>: Abbrev Number: 141 (DW_TAG_variable)
// followed by no attributes, and the next DIE is a sibling,
// not a child
*/
}
return;
bad_DIE:
set_position_of_Cursor( c_die, saved_die_c_offset );
set_position_of_Cursor( c_abbv, saved_abbv_c_offset );
posn = uncook_die( cc, posn, &debug_types_flag, &alt_flag );
VG_(printf)(" <%d><%lx>: %s", level, posn, ML_(pp_DW_TAG)( dtag ) );
if (debug_types_flag) {
VG_(printf)(" (in .debug_types)");
}
else if (alt_flag) {
VG_(printf)(" (in alternate .debug_info)");
}
VG_(printf)("\n");
while (True) {
DW_AT attr = (DW_AT) get_ULEB128( c_abbv );
DW_FORM form = (DW_FORM)get_ULEB128( c_abbv );
if (attr == 0 && form == 0) break;
VG_(printf)(" %18s: ", ML_(pp_DW_AT)(attr));
/* Get the form contents, so as to print them */
get_Form_contents( &cts, cc, c_die, True, form );
VG_(printf)("\t\n");
}
VG_(printf)("\n");
cc->barf("parse_var_DIE: confused by the above DIE");
/*NOTREACHED*/
}
/*------------------------------------------------------------*/
/*--- ---*/
/*--- Parsing of type-related DIEs ---*/
/*--- ---*/
/*------------------------------------------------------------*/
#define N_D3_TYPE_STACK 16
typedef
struct {
/* What source language? 'A'=Ada83/95,
'C'=C/C++,
'F'=Fortran,
'?'=other
Established once per compilation unit. */
UChar language;
/* A stack of types which are currently under construction */
Int sp; /* [sp] is innermost active entry; sp==-1 for empty
stack */
/* Note that the TyEnts in qparentE are temporary copies of the
ones accumulating in the main tyent array. So it is not safe
to free up anything on them when popping them off the stack
(iow, it isn't safe to use TyEnt__make_EMPTY on them). Just
memset them to zero when done. */
TyEnt qparentE[N_D3_TYPE_STACK]; /* parent TyEnts */
Int qlevel[N_D3_TYPE_STACK];
}
D3TypeParser;
static void typestack_show ( D3TypeParser* parser, const HChar* str ) {
Word i;
VG_(printf)(" typestack (%s) {\n", str);
for (i = 0; i <= parser->sp; i++) {
VG_(printf)(" [%ld] (level %d): ", i, parser->qlevel[i]);
ML_(pp_TyEnt)( &parser->qparentE[i] );
VG_(printf)("\n");
}
VG_(printf)(" }\n");
}
/* Remove from the stack, all entries with .level > 'level' */
static
void typestack_preen ( D3TypeParser* parser, Bool td3, Int level )
{
Bool changed = False;
vg_assert(parser->sp < N_D3_TYPE_STACK);
while (True) {
vg_assert(parser->sp >= -1);
if (parser->sp == -1) break;
if (parser->qlevel[parser->sp] <= level) break;
if (0)
TRACE_D3("BBBBAAAA typestack_pop [newsp=%d]\n", parser->sp-1);
vg_assert(ML_(TyEnt__is_type)(&parser->qparentE[parser->sp]));
VG_(memset)(&parser->qparentE[parser->sp], 0, sizeof(TyEnt));
parser->qparentE[parser->sp].cuOff = D3_INVALID_CUOFF;
parser->qparentE[parser->sp].tag = Te_EMPTY;
parser->qlevel[parser->sp] = 0;
parser->sp--;
changed = True;
}
if (changed && td3)
typestack_show( parser, "after preen" );
}
static Bool typestack_is_empty ( D3TypeParser* parser ) {
vg_assert(parser->sp >= -1 && parser->sp < N_D3_TYPE_STACK);
return parser->sp == -1;
}
static void typestack_push ( CUConst* cc,
D3TypeParser* parser,
Bool td3,
TyEnt* parentE, Int level ) {
if (0)
TRACE_D3("BBBBAAAA typestack_push[newsp=%d]: %d %05lx\n",
parser->sp+1, level, parentE->cuOff);
/* First we need to zap everything >= 'level', as we are about to
replace any previous entry at 'level', so .. */
typestack_preen(parser, /*td3*/False, level-1);
vg_assert(parser->sp >= -1);
vg_assert(parser->sp < N_D3_TYPE_STACK);
if (parser->sp == N_D3_TYPE_STACK-1)
cc->barf("typestack_push: N_D3_TYPE_STACK is too low; "
"increase and recompile");
if (parser->sp >= 0)
vg_assert(parser->qlevel[parser->sp] < level);
parser->sp++;
vg_assert(parser->qparentE[parser->sp].tag == Te_EMPTY);
vg_assert(parser->qlevel[parser->sp] == 0);
vg_assert(parentE);
vg_assert(ML_(TyEnt__is_type)(parentE));
vg_assert(parentE->cuOff != D3_INVALID_CUOFF);
parser->qparentE[parser->sp] = *parentE;
parser->qlevel[parser->sp] = level;
if (td3)
typestack_show( parser, "after push" );
}
/* True if the subrange type being parsed gives the bounds of an array. */
static Bool subrange_type_denotes_array_bounds ( D3TypeParser* parser,
DW_TAG dtag ) {
vg_assert(dtag == DW_TAG_subrange_type);
/* For most languages, a subrange_type dtag always gives the
bounds of an array.
For Ada, there are additional conditions as a subrange_type
is also used for other purposes. */
if (parser->language != 'A')
/* not Ada, so it definitely denotes an array bound. */
return True;
else
/* Extra constraints for Ada: it only denotes an array bound if .. */
return (! typestack_is_empty(parser)
&& parser->qparentE[parser->sp].tag == Te_TyArray);
}
/* Parse a type-related DIE. 'parser' holds the current parser state.
'admin' is where the completed types are dumped. 'dtag' is the tag
for this DIE. 'c_die' points to the start of the data fields (FORM
stuff) for the DIE. c_abbv points to the start of the (name,form)
pairs which describe the DIE.
We may find the DIE uninteresting, in which case we should ignore
it.
What happens: the DIE is examined. If uninteresting, it is ignored.
Otherwise, the DIE gives rise to two things:
(1) the offset of this DIE in the CU -- the cuOffset, a UWord
(2) a TyAdmin structure, which holds the type, or related stuff
(2) is added at the end of 'tyadmins', at some index, say 'i'.
A pair (cuOffset, i) is added to 'tydict'.
Hence 'tyadmins' holds the actual type entities, and 'tydict' holds
a mapping from cuOffset to the index of the corresponding entry in
'tyadmin'.
When resolving a cuOffset to a TyAdmin, first look up the cuOffset
in the tydict (by binary search). This gives an index into
tyadmins, and the required entity lives in tyadmins at that index.
*/
__attribute__((noinline))
static void parse_type_DIE ( /*MOD*/XArray* /* of TyEnt */ tyents,
/*MOD*/D3TypeParser* parser,
DW_TAG dtag,
UWord posn,
Int level,
Cursor* c_die,
Cursor* c_abbv,
CUConst* cc,
Bool td3 )
{
FormContents cts;
TyEnt typeE;
TyEnt atomE;
TyEnt fieldE;
TyEnt boundE;
Bool debug_types_flag;
Bool alt_flag;
UWord saved_die_c_offset = get_position_of_Cursor( c_die );
UWord saved_abbv_c_offset = get_position_of_Cursor( c_abbv );
VG_(memset)( &typeE, 0xAA, sizeof(typeE) );
VG_(memset)( &atomE, 0xAA, sizeof(atomE) );
VG_(memset)( &fieldE, 0xAA, sizeof(fieldE) );
VG_(memset)( &boundE, 0xAA, sizeof(boundE) );
/* If we've returned to a level at or above any previously noted
parent, un-note it, so we don't believe we're still collecting
its children. */
typestack_preen( parser, td3, level-1 );
if (dtag == DW_TAG_compile_unit
|| dtag == DW_TAG_type_unit
|| dtag == DW_TAG_partial_unit) {
/* See if we can find DW_AT_language, since it is important for
establishing array bounds (see DW_TAG_subrange_type below in
this fn) */
while (True) {
DW_AT attr = (DW_AT) get_ULEB128( c_abbv );
DW_FORM form = (DW_FORM)get_ULEB128( c_abbv );
if (attr == 0 && form == 0) break;
get_Form_contents( &cts, cc, c_die, False/*td3*/, form );
if (attr != DW_AT_language)
continue;
if (cts.szB <= 0)
goto_bad_DIE;
switch (cts.u.val) {
case DW_LANG_C89: case DW_LANG_C:
case DW_LANG_C_plus_plus: case DW_LANG_ObjC:
case DW_LANG_ObjC_plus_plus: case DW_LANG_UPC:
case DW_LANG_Upc: case DW_LANG_C99:
parser->language = 'C'; break;
case DW_LANG_Fortran77: case DW_LANG_Fortran90:
case DW_LANG_Fortran95:
parser->language = 'F'; break;
case DW_LANG_Ada83: case DW_LANG_Ada95:
parser->language = 'A'; break;
case DW_LANG_Cobol74:
case DW_LANG_Cobol85: case DW_LANG_Pascal83:
case DW_LANG_Modula2: case DW_LANG_Java:
case DW_LANG_PLI:
case DW_LANG_D: case DW_LANG_Python:
case DW_LANG_Mips_Assembler:
parser->language = '?'; break;
default:
goto_bad_DIE;
}
}
}
if (dtag == DW_TAG_base_type) {
/* We can pick up a new base type any time. */
VG_(memset)(&typeE, 0, sizeof(typeE));
typeE.cuOff = D3_INVALID_CUOFF;
typeE.tag = Te_TyBase;
while (True) {
DW_AT attr = (DW_AT) get_ULEB128( c_abbv );
DW_FORM form = (DW_FORM)get_ULEB128( c_abbv );
if (attr == 0 && form == 0) break;
get_Form_contents( &cts, cc, c_die, False/*td3*/, form );
if (attr == DW_AT_name && cts.szB < 0) {
typeE.Te.TyBase.name
= ML_(cur_read_strdup)( cts.u.cur,
"di.readdwarf3.ptD.base_type.1" );
}
if (attr == DW_AT_byte_size && cts.szB > 0) {
typeE.Te.TyBase.szB = cts.u.val;
}
if (attr == DW_AT_encoding && cts.szB > 0) {
switch (cts.u.val) {
case DW_ATE_unsigned: case DW_ATE_unsigned_char:
case DW_ATE_UTF: /* since DWARF4, e.g. char16_t from C++ */
case DW_ATE_boolean:/* FIXME - is this correct? */
case DW_ATE_unsigned_fixed:
typeE.Te.TyBase.enc = 'U'; break;
case DW_ATE_signed: case DW_ATE_signed_char:
case DW_ATE_signed_fixed:
typeE.Te.TyBase.enc = 'S'; break;
case DW_ATE_float:
typeE.Te.TyBase.enc = 'F'; break;
case DW_ATE_complex_float:
typeE.Te.TyBase.enc = 'C'; break;
default:
goto_bad_DIE;
}
}
}
/* Invent a name if it doesn't have one. gcc-4.3
-ftree-vectorize is observed to emit nameless base types. */
if (!typeE.Te.TyBase.name)
typeE.Te.TyBase.name
= ML_(dinfo_strdup)( "di.readdwarf3.ptD.base_type.2",
"<anon_base_type>" );
/* Do we have something that looks sane? */
if (/* must have a name */
typeE.Te.TyBase.name == NULL
/* and a plausible size. Yes, really 32: "complex long
double" apparently has size=32 */
|| typeE.Te.TyBase.szB < 0 || typeE.Te.TyBase.szB > 32
/* and a plausible encoding */
|| (typeE.Te.TyBase.enc != 'U'
&& typeE.Te.TyBase.enc != 'S'
&& typeE.Te.TyBase.enc != 'F'
&& typeE.Te.TyBase.enc != 'C'))
goto_bad_DIE;
/* Last minute hack: if we see this
<1><515>: DW_TAG_base_type
DW_AT_byte_size : 0
DW_AT_encoding : 5
DW_AT_name : void
convert it into a real Void type. */
if (typeE.Te.TyBase.szB == 0
&& 0 == VG_(strcmp)("void", typeE.Te.TyBase.name)) {
ML_(TyEnt__make_EMPTY)(&typeE);
typeE.tag = Te_TyVoid;
typeE.Te.TyVoid.isFake = False; /* it's a real one! */
}
goto acquire_Type;
}
/*
* An example of DW_TAG_rvalue_reference_type:
*
* $ readelf --debug-dump /usr/lib/debug/usr/lib/libstdc++.so.6.0.16.debug
* <1><1014>: Abbrev Number: 55 (DW_TAG_rvalue_reference_type)
* <1015> DW_AT_byte_size : 4
* <1016> DW_AT_type : <0xe52>
*/
if (dtag == DW_TAG_pointer_type || dtag == DW_TAG_reference_type
|| dtag == DW_TAG_ptr_to_member_type
|| dtag == DW_TAG_rvalue_reference_type) {
/* This seems legit for _pointer_type and _reference_type. I
don't know if rolling _ptr_to_member_type in here really is
legit, but it's better than not handling it at all. */
VG_(memset)(&typeE, 0, sizeof(typeE));
typeE.cuOff = D3_INVALID_CUOFF;
switch (dtag) {
case DW_TAG_pointer_type:
typeE.tag = Te_TyPtr;
break;
case DW_TAG_reference_type:
typeE.tag = Te_TyRef;
break;
case DW_TAG_ptr_to_member_type:
typeE.tag = Te_TyPtrMbr;
break;
case DW_TAG_rvalue_reference_type:
typeE.tag = Te_TyRvalRef;
break;
default:
vg_assert(False);
}
/* target type defaults to void */
typeE.Te.TyPorR.typeR = D3_FAKEVOID_CUOFF;
/* These four type kinds don't *have* to specify their size, in
which case we assume it's a machine word. But if they do
specify it, it must be a machine word :-) This probably
assumes that the word size of the Dwarf3 we're reading is the
same size as that on the machine. gcc appears to give a size
whereas icc9 doesn't. */
typeE.Te.TyPorR.szB = sizeof(UWord);
while (True) {
DW_AT attr = (DW_AT) get_ULEB128( c_abbv );
DW_FORM form = (DW_FORM)get_ULEB128( c_abbv );
if (attr == 0 && form == 0) break;
get_Form_contents( &cts, cc, c_die, False/*td3*/, form );
if (attr == DW_AT_byte_size && cts.szB > 0) {
typeE.Te.TyPorR.szB = cts.u.val;
}
if (attr == DW_AT_type && cts.szB > 0) {
typeE.Te.TyPorR.typeR
= cook_die_using_form( cc, (UWord)cts.u.val, form );
}
}
/* Do we have something that looks sane? */
if (typeE.Te.TyPorR.szB != sizeof(UWord))
goto_bad_DIE;
else
goto acquire_Type;
}
if (dtag == DW_TAG_enumeration_type) {
/* Create a new Type to hold the results. */
VG_(memset)(&typeE, 0, sizeof(typeE));
typeE.cuOff = posn;
typeE.tag = Te_TyEnum;
Bool is_decl = False;
typeE.Te.TyEnum.atomRs
= VG_(newXA)( ML_(dinfo_zalloc), "di.readdwarf3.ptD.enum_type.1",
ML_(dinfo_free),
sizeof(UWord) );
while (True) {
DW_AT attr = (DW_AT) get_ULEB128( c_abbv );
DW_FORM form = (DW_FORM)get_ULEB128( c_abbv );
if (attr == 0 && form == 0) break;
get_Form_contents( &cts, cc, c_die, False/*td3*/, form );
if (attr == DW_AT_name && cts.szB < 0) {
typeE.Te.TyEnum.name
= ML_(cur_read_strdup)( cts.u.cur,
"di.readdwarf3.pTD.enum_type.2" );
}
if (attr == DW_AT_byte_size && cts.szB > 0) {
typeE.Te.TyEnum.szB = cts.u.val;
}
if (attr == DW_AT_declaration) {
is_decl = True;
}
}
if (!typeE.Te.TyEnum.name)
typeE.Te.TyEnum.name
= ML_(dinfo_strdup)( "di.readdwarf3.pTD.enum_type.3",
"<anon_enum_type>" );
/* Do we have something that looks sane? */
if (typeE.Te.TyEnum.szB == 0
/* we must know the size */
/* but not for Ada, which uses such dummy
enumerations as helper for gdb ada mode.
Also GCC allows incomplete enums as GNU extension.
http://gcc.gnu.org/onlinedocs/gcc/Incomplete-Enums.html
These are marked as DW_AT_declaration and won't have
a size. They can only be used in declaration or as
pointer types. You can't allocate variables or storage
using such an enum type. (Also GCC seems to have a bug
that will put such an enumeration_type into a .debug_types
unit which should only contain complete types.) */
&& (parser->language != 'A' && !is_decl)) {
goto_bad_DIE;
}
/* On't stack! */
typestack_push( cc, parser, td3, &typeE, level );
goto acquire_Type;
}
/* gcc (GCC) 4.4.0 20081017 (experimental) occasionally produces
DW_TAG_enumerator with only a DW_AT_name but no
DW_AT_const_value. This is in violation of the Dwarf3 standard,
and appears to be a new "feature" of gcc - versions 4.3.x and
earlier do not appear to do this. So accept DW_TAG_enumerator
which only have a name but no value. An example:
<1><180>: Abbrev Number: 6 (DW_TAG_enumeration_type)
<181> DW_AT_name : (indirect string, offset: 0xda70):
QtMsgType
<185> DW_AT_byte_size : 4
<186> DW_AT_decl_file : 14
<187> DW_AT_decl_line : 1480
<189> DW_AT_sibling : <0x1a7>
<2><18d>: Abbrev Number: 7 (DW_TAG_enumerator)
<18e> DW_AT_name : (indirect string, offset: 0x9e18):
QtDebugMsg
<2><192>: Abbrev Number: 7 (DW_TAG_enumerator)
<193> DW_AT_name : (indirect string, offset: 0x1505f):
QtWarningMsg
<2><197>: Abbrev Number: 7 (DW_TAG_enumerator)
<198> DW_AT_name : (indirect string, offset: 0x16f4a):
QtCriticalMsg
<2><19c>: Abbrev Number: 7 (DW_TAG_enumerator)
<19d> DW_AT_name : (indirect string, offset: 0x156dd):
QtFatalMsg
<2><1a1>: Abbrev Number: 7 (DW_TAG_enumerator)
<1a2> DW_AT_name : (indirect string, offset: 0x13660):
QtSystemMsg
*/
if (dtag == DW_TAG_enumerator) {
VG_(memset)( &atomE, 0, sizeof(atomE) );
atomE.cuOff = posn;
atomE.tag = Te_Atom;
while (True) {
DW_AT attr = (DW_AT) get_ULEB128( c_abbv );
DW_FORM form = (DW_FORM)get_ULEB128( c_abbv );
if (attr == 0 && form == 0) break;
get_Form_contents( &cts, cc, c_die, False/*td3*/, form );
if (attr == DW_AT_name && cts.szB < 0) {
atomE.Te.Atom.name
= ML_(cur_read_strdup)( cts.u.cur,
"di.readdwarf3.pTD.enumerator.1" );
}
if (attr == DW_AT_const_value && cts.szB > 0) {
atomE.Te.Atom.value = cts.u.val;
atomE.Te.Atom.valueKnown = True;
}
}
/* Do we have something that looks sane? */
if (atomE.Te.Atom.name == NULL)
goto_bad_DIE;
/* Do we have a plausible parent? */
if (typestack_is_empty(parser)) goto_bad_DIE;
vg_assert(ML_(TyEnt__is_type)(&parser->qparentE[parser->sp]));
vg_assert(parser->qparentE[parser->sp].cuOff != D3_INVALID_CUOFF);
if (level != parser->qlevel[parser->sp]+1) goto_bad_DIE;
if (parser->qparentE[parser->sp].tag != Te_TyEnum) goto_bad_DIE;
/* Record this child in the parent */
vg_assert(parser->qparentE[parser->sp].Te.TyEnum.atomRs);
VG_(addToXA)( parser->qparentE[parser->sp].Te.TyEnum.atomRs,
&atomE );
/* And record the child itself */
goto acquire_Atom;
}
/* Treat DW_TAG_class_type as if it was a DW_TAG_structure_type. I
don't know if this is correct, but it at least makes this reader
usable for gcc-4.3 produced Dwarf3. */
if (dtag == DW_TAG_structure_type || dtag == DW_TAG_class_type
|| dtag == DW_TAG_union_type) {
Bool have_szB = False;
Bool is_decl = False;
Bool is_spec = False;
/* Create a new Type to hold the results. */
VG_(memset)(&typeE, 0, sizeof(typeE));
typeE.cuOff = posn;
typeE.tag = Te_TyStOrUn;
typeE.Te.TyStOrUn.name = NULL;
typeE.Te.TyStOrUn.typeR = D3_INVALID_CUOFF;
typeE.Te.TyStOrUn.fieldRs
= VG_(newXA)( ML_(dinfo_zalloc), "di.readdwarf3.pTD.struct_type.1",
ML_(dinfo_free),
sizeof(UWord) );
typeE.Te.TyStOrUn.complete = True;
typeE.Te.TyStOrUn.isStruct = dtag == DW_TAG_structure_type
|| dtag == DW_TAG_class_type;
while (True) {
DW_AT attr = (DW_AT) get_ULEB128( c_abbv );
DW_FORM form = (DW_FORM)get_ULEB128( c_abbv );
if (attr == 0 && form == 0) break;
get_Form_contents( &cts, cc, c_die, False/*td3*/, form );
if (attr == DW_AT_name && cts.szB < 0) {
typeE.Te.TyStOrUn.name
= ML_(cur_read_strdup)( cts.u.cur,
"di.readdwarf3.ptD.struct_type.2" );
}
if (attr == DW_AT_byte_size && cts.szB >= 0) {
typeE.Te.TyStOrUn.szB = cts.u.val;
have_szB = True;
}
if (attr == DW_AT_declaration && cts.szB > 0 && cts.u.val > 0) {
is_decl = True;
}
if (attr == DW_AT_specification && cts.szB > 0 && cts.u.val > 0) {
is_spec = True;
}
if (attr == DW_AT_signature && form == DW_FORM_ref_sig8
&& cts.szB > 0) {
have_szB = True;
typeE.Te.TyStOrUn.szB = 8;
typeE.Te.TyStOrUn.typeR
= cook_die_using_form( cc, (UWord)cts.u.val, form );
}
}
/* Do we have something that looks sane? */
if (is_decl && (!is_spec)) {
/* It's a DW_AT_declaration. We require the name but
nothing else. */
/* JRS 2012-06-28: following discussion w/ tromey, if the the
type doesn't have name, just make one up, and accept it.
It might be referred to by other DIEs, so ignoring it
doesn't seem like a safe option. */
if (typeE.Te.TyStOrUn.name == NULL)
typeE.Te.TyStOrUn.name
= ML_(dinfo_strdup)( "di.readdwarf3.ptD.struct_type.3",
"<anon_struct_type>" );
typeE.Te.TyStOrUn.complete = False;
/* JRS 2009 Aug 10: <possible kludge>? */
/* Push this tyent on the stack, even though it's incomplete.
It appears that gcc-4.4 on Fedora 11 will sometimes create
DW_TAG_member entries for it, and so we need to have a
plausible parent present in order for that to work. See
#200029 comments 8 and 9. */
typestack_push( cc, parser, td3, &typeE, level );
/* </possible kludge> */
goto acquire_Type;
}
if ((!is_decl) /* && (!is_spec) */) {
/* this is the common, ordinary case */
/* The name can be present, or not */
if (!have_szB) {
/* We must know the size.
But in Ada, record with discriminants might have no size.
But in C, VLA in the middle of a struct (gcc extension)
might have no size.
Instead, some GNAT dwarf extensions and/or dwarf entries
allow to calculate the struct size at runtime.
We cannot do that (yet?) so, the temporary kludge is to use
a small size. */
typeE.Te.TyStOrUn.szB = 1;
}
/* On't stack! */
typestack_push( cc, parser, td3, &typeE, level );
goto acquire_Type;
}
else {
/* don't know how to handle any other variants just now */
goto_bad_DIE;
}
}
if (dtag == DW_TAG_member) {
/* Acquire member entries for both DW_TAG_structure_type and
DW_TAG_union_type. They differ minorly, in that struct
members must have a DW_AT_data_member_location expression
whereas union members must not. */
Bool parent_is_struct;
VG_(memset)( &fieldE, 0, sizeof(fieldE) );
fieldE.cuOff = posn;
fieldE.tag = Te_Field;
fieldE.Te.Field.typeR = D3_INVALID_CUOFF;
while (True) {
DW_AT attr = (DW_AT) get_ULEB128( c_abbv );
DW_FORM form = (DW_FORM)get_ULEB128( c_abbv );
if (attr == 0 && form == 0) break;
get_Form_contents( &cts, cc, c_die, False/*td3*/, form );
if (attr == DW_AT_name && cts.szB < 0) {
fieldE.Te.Field.name
= ML_(cur_read_strdup)( cts.u.cur,
"di.readdwarf3.ptD.member.1" );
}
if (attr == DW_AT_type && cts.szB > 0) {
fieldE.Te.Field.typeR
= cook_die_using_form( cc, (UWord)cts.u.val, form );
}
/* There are 2 different cases for DW_AT_data_member_location.
If it is a constant class attribute, it contains byte offset
from the beginning of the containing entity.
Otherwise it is a location expression. */
if (attr == DW_AT_data_member_location && cts.szB > 0) {
fieldE.Te.Field.nLoc = -1;
fieldE.Te.Field.pos.offset = cts.u.val;
}
if (attr == DW_AT_data_member_location && cts.szB <= 0) {
fieldE.Te.Field.nLoc = (UWord)(-cts.szB);
fieldE.Te.Field.pos.loc
= ML_(cur_read_memdup)( cts.u.cur,
(SizeT)fieldE.Te.Field.nLoc,
"di.readdwarf3.ptD.member.2" );
}
}
/* Do we have a plausible parent? */
if (typestack_is_empty(parser)) goto_bad_DIE;
vg_assert(ML_(TyEnt__is_type)(&parser->qparentE[parser->sp]));
vg_assert(parser->qparentE[parser->sp].cuOff != D3_INVALID_CUOFF);
if (level != parser->qlevel[parser->sp]+1) goto_bad_DIE;
if (parser->qparentE[parser->sp].tag != Te_TyStOrUn) goto_bad_DIE;
/* Do we have something that looks sane? If this a member of a
struct, we must have a location expression; but if a member
of a union that is irrelevant (D3 spec sec 5.6.6). We ought
to reject in the latter case, but some compilers have been
observed to emit constant-zero expressions. So just ignore
them. */
parent_is_struct
= parser->qparentE[parser->sp].Te.TyStOrUn.isStruct;
if (!fieldE.Te.Field.name)
fieldE.Te.Field.name
= ML_(dinfo_strdup)( "di.readdwarf3.ptD.member.3",
"<anon_field>" );
vg_assert(fieldE.Te.Field.name);
if (fieldE.Te.Field.typeR == D3_INVALID_CUOFF)
goto_bad_DIE;
if (fieldE.Te.Field.nLoc) {
if (!parent_is_struct) {
/* If this is a union type, pretend we haven't seen the data
member location expression, as it is by definition
redundant (it must be zero). */
if (fieldE.Te.Field.nLoc > 0)
ML_(dinfo_free)(fieldE.Te.Field.pos.loc);
fieldE.Te.Field.pos.loc = NULL;
fieldE.Te.Field.nLoc = 0;
}
/* Record this child in the parent */
fieldE.Te.Field.isStruct = parent_is_struct;
vg_assert(parser->qparentE[parser->sp].Te.TyStOrUn.fieldRs);
VG_(addToXA)( parser->qparentE[parser->sp].Te.TyStOrUn.fieldRs,
&posn );
/* And record the child itself */
goto acquire_Field;
} else {
/* Member with no location - this can happen with static
const members in C++ code which are compile time constants
that do no exist in the class. They're not of any interest
to us so we ignore them. */
ML_(TyEnt__make_EMPTY)(&fieldE);
}
}
if (dtag == DW_TAG_array_type) {
VG_(memset)(&typeE, 0, sizeof(typeE));
typeE.cuOff = posn;
typeE.tag = Te_TyArray;
typeE.Te.TyArray.typeR = D3_INVALID_CUOFF;
typeE.Te.TyArray.boundRs
= VG_(newXA)( ML_(dinfo_zalloc), "di.readdwarf3.ptD.array_type.1",
ML_(dinfo_free),
sizeof(UWord) );
while (True) {
DW_AT attr = (DW_AT) get_ULEB128( c_abbv );
DW_FORM form = (DW_FORM)get_ULEB128( c_abbv );
if (attr == 0 && form == 0) break;
get_Form_contents( &cts, cc, c_die, False/*td3*/, form );
if (attr == DW_AT_type && cts.szB > 0) {
typeE.Te.TyArray.typeR
= cook_die_using_form( cc, (UWord)cts.u.val, form );
}
}
if (typeE.Te.TyArray.typeR == D3_INVALID_CUOFF)
goto_bad_DIE;
/* On't stack! */
typestack_push( cc, parser, td3, &typeE, level );
goto acquire_Type;
}
/* this is a subrange type defining the bounds of an array. */
if (dtag == DW_TAG_subrange_type
&& subrange_type_denotes_array_bounds(parser, dtag)) {
Bool have_lower = False;
Bool have_upper = False;
Bool have_count = False;
Long lower = 0;
Long upper = 0;
switch (parser->language) {
case 'C': have_lower = True; lower = 0; break;
case 'F': have_lower = True; lower = 1; break;
case '?': have_lower = False; break;
case 'A': have_lower = False; break;
default: vg_assert(0); /* assured us by handling of
DW_TAG_compile_unit in this fn */
}
VG_(memset)( &boundE, 0, sizeof(boundE) );
boundE.cuOff = D3_INVALID_CUOFF;
boundE.tag = Te_Bound;
while (True) {
DW_AT attr = (DW_AT) get_ULEB128( c_abbv );
DW_FORM form = (DW_FORM)get_ULEB128( c_abbv );
if (attr == 0 && form == 0) break;
get_Form_contents( &cts, cc, c_die, False/*td3*/, form );
if (attr == DW_AT_lower_bound && cts.szB > 0) {
lower = (Long)cts.u.val;
have_lower = True;
}
if (attr == DW_AT_upper_bound && cts.szB > 0) {
upper = (Long)cts.u.val;
have_upper = True;
}
if (attr == DW_AT_count && cts.szB > 0) {
/*count = (Long)cts.u.val;*/
have_count = True;
}
}
/* FIXME: potentially skip the rest if no parent present, since
it could be the case that this subrange type is free-standing
(not being used to describe the bounds of a containing array
type) */
/* Do we have a plausible parent? */
if (typestack_is_empty(parser)) goto_bad_DIE;
vg_assert(ML_(TyEnt__is_type)(&parser->qparentE[parser->sp]));
vg_assert(parser->qparentE[parser->sp].cuOff != D3_INVALID_CUOFF);
if (level != parser->qlevel[parser->sp]+1) goto_bad_DIE;
if (parser->qparentE[parser->sp].tag != Te_TyArray) goto_bad_DIE;
/* Figure out if we have a definite range or not */
if (have_lower && have_upper && (!have_count)) {
boundE.Te.Bound.knownL = True;
boundE.Te.Bound.knownU = True;
boundE.Te.Bound.boundL = lower;
boundE.Te.Bound.boundU = upper;
}
else if (have_lower && (!have_upper) && (!have_count)) {
boundE.Te.Bound.knownL = True;
boundE.Te.Bound.knownU = False;
boundE.Te.Bound.boundL = lower;
boundE.Te.Bound.boundU = 0;
}
else if ((!have_lower) && have_upper && (!have_count)) {
boundE.Te.Bound.knownL = False;
boundE.Te.Bound.knownU = True;
boundE.Te.Bound.boundL = 0;
boundE.Te.Bound.boundU = upper;
}
else if ((!have_lower) && (!have_upper) && (!have_count)) {
boundE.Te.Bound.knownL = False;
boundE.Te.Bound.knownU = False;
boundE.Te.Bound.boundL = 0;
boundE.Te.Bound.boundU = 0;
} else {
/* FIXME: handle more cases */
goto_bad_DIE;
}
/* Record this bound in the parent */
boundE.cuOff = posn;
vg_assert(parser->qparentE[parser->sp].Te.TyArray.boundRs);
VG_(addToXA)( parser->qparentE[parser->sp].Te.TyArray.boundRs,
&boundE.cuOff );
/* And record the child itself */
goto acquire_Bound;
}
/* typedef or subrange_type other than array bounds. */
if (dtag == DW_TAG_typedef
|| (dtag == DW_TAG_subrange_type
&& !subrange_type_denotes_array_bounds(parser, dtag))) {
/* subrange_type other than array bound is only for Ada. */
vg_assert (dtag == DW_TAG_typedef || parser->language == 'A');
/* We can pick up a new typedef/subrange_type any time. */
VG_(memset)(&typeE, 0, sizeof(typeE));
typeE.cuOff = D3_INVALID_CUOFF;
typeE.tag = Te_TyTyDef;
typeE.Te.TyTyDef.name = NULL;
typeE.Te.TyTyDef.typeR = D3_INVALID_CUOFF;
while (True) {
DW_AT attr = (DW_AT) get_ULEB128( c_abbv );
DW_FORM form = (DW_FORM)get_ULEB128( c_abbv );
if (attr == 0 && form == 0) break;
get_Form_contents( &cts, cc, c_die, False/*td3*/, form );
if (attr == DW_AT_name && cts.szB < 0) {
typeE.Te.TyTyDef.name
= ML_(cur_read_strdup)( cts.u.cur,
"di.readdwarf3.ptD.typedef.1" );
}
if (attr == DW_AT_type && cts.szB > 0) {
typeE.Te.TyTyDef.typeR
= cook_die_using_form( cc, (UWord)cts.u.val, form );
}
}
/* Do we have something that looks sane?
gcc gnat Ada generates minimal typedef
such as the below
<6><91cc>: DW_TAG_typedef
DW_AT_abstract_ori: <9066>
g++ for OMP can generate artificial functions that have
parameters that refer to pointers to unnamed typedefs.
See https://bugs.kde.org/show_bug.cgi?id=273475
So we cannot require a name for a DW_TAG_typedef.
*/
goto acquire_Type;
}
if (dtag == DW_TAG_subroutine_type) {
/* function type? just record that one fact and ask no
further questions. */
VG_(memset)(&typeE, 0, sizeof(typeE));
typeE.cuOff = D3_INVALID_CUOFF;
typeE.tag = Te_TyFn;
goto acquire_Type;
}
if (dtag == DW_TAG_volatile_type || dtag == DW_TAG_const_type) {
Int have_ty = 0;
VG_(memset)(&typeE, 0, sizeof(typeE));
typeE.cuOff = D3_INVALID_CUOFF;
typeE.tag = Te_TyQual;
typeE.Te.TyQual.qual
= dtag == DW_TAG_volatile_type ? 'V' : 'C';
/* target type defaults to 'void' */
typeE.Te.TyQual.typeR = D3_FAKEVOID_CUOFF;
while (True) {
DW_AT attr = (DW_AT) get_ULEB128( c_abbv );
DW_FORM form = (DW_FORM)get_ULEB128( c_abbv );
if (attr == 0 && form == 0) break;
get_Form_contents( &cts, cc, c_die, False/*td3*/, form );
if (attr == DW_AT_type && cts.szB > 0) {
typeE.Te.TyQual.typeR
= cook_die_using_form( cc, (UWord)cts.u.val, form );
have_ty++;
}
}
/* gcc sometimes generates DW_TAG_const/volatile_type without
DW_AT_type and GDB appears to interpret the type as 'const
void' (resp. 'volatile void'). So just allow it .. */
if (have_ty == 1 || have_ty == 0)
goto acquire_Type;
else
goto_bad_DIE;
}
/*
* Treat DW_TAG_unspecified_type as type void. An example of DW_TAG_unspecified_type:
*
* $ readelf --debug-dump /usr/lib/debug/usr/lib/libstdc++.so.6.0.16.debug
* <1><10d4>: Abbrev Number: 53 (DW_TAG_unspecified_type)
* <10d5> DW_AT_name : (indirect string, offset: 0xdb7): decltype(nullptr)
*/
if (dtag == DW_TAG_unspecified_type) {
VG_(memset)(&typeE, 0, sizeof(typeE));
typeE.cuOff = D3_INVALID_CUOFF;
typeE.tag = Te_TyQual;
typeE.Te.TyQual.typeR = D3_FAKEVOID_CUOFF;
goto acquire_Type;
}
/* else ignore this DIE */
return;
/*NOTREACHED*/
acquire_Type:
if (0) VG_(printf)("YYYY Acquire Type\n");
vg_assert(ML_(TyEnt__is_type)( &typeE ));
vg_assert(typeE.cuOff == D3_INVALID_CUOFF || typeE.cuOff == posn);
typeE.cuOff = posn;
VG_(addToXA)( tyents, &typeE );
return;
/*NOTREACHED*/
acquire_Atom:
if (0) VG_(printf)("YYYY Acquire Atom\n");
vg_assert(atomE.tag == Te_Atom);
vg_assert(atomE.cuOff == D3_INVALID_CUOFF || atomE.cuOff == posn);
atomE.cuOff = posn;
VG_(addToXA)( tyents, &atomE );
return;
/*NOTREACHED*/
acquire_Field:
/* For union members, Expr should be absent */
if (0) VG_(printf)("YYYY Acquire Field\n");
vg_assert(fieldE.tag == Te_Field);
vg_assert(fieldE.Te.Field.nLoc <= 0 || fieldE.Te.Field.pos.loc != NULL);
vg_assert(fieldE.Te.Field.nLoc != 0 || fieldE.Te.Field.pos.loc == NULL);
if (fieldE.Te.Field.isStruct) {
vg_assert(fieldE.Te.Field.nLoc != 0);
} else {
vg_assert(fieldE.Te.Field.nLoc == 0);
}
vg_assert(fieldE.cuOff == D3_INVALID_CUOFF || fieldE.cuOff == posn);
fieldE.cuOff = posn;
VG_(addToXA)( tyents, &fieldE );
return;
/*NOTREACHED*/
acquire_Bound:
if (0) VG_(printf)("YYYY Acquire Bound\n");
vg_assert(boundE.tag == Te_Bound);
vg_assert(boundE.cuOff == D3_INVALID_CUOFF || boundE.cuOff == posn);
boundE.cuOff = posn;
VG_(addToXA)( tyents, &boundE );
return;
/*NOTREACHED*/
bad_DIE:
set_position_of_Cursor( c_die, saved_die_c_offset );
set_position_of_Cursor( c_abbv, saved_abbv_c_offset );
posn = uncook_die( cc, posn, &debug_types_flag, &alt_flag );
VG_(printf)(" <%d><%lx>: %s", level, posn, ML_(pp_DW_TAG)( dtag ) );
if (debug_types_flag) {
VG_(printf)(" (in .debug_types)");
} else if (alt_flag) {
VG_(printf)(" (in alternate .debug_info)");
}
VG_(printf)("\n");
while (True) {
DW_AT attr = (DW_AT) get_ULEB128( c_abbv );
DW_FORM form = (DW_FORM)get_ULEB128( c_abbv );
if (attr == 0 && form == 0) break;
VG_(printf)(" %18s: ", ML_(pp_DW_AT)(attr));
/* Get the form contents, so as to print them */
get_Form_contents( &cts, cc, c_die, True, form );
VG_(printf)("\t\n");
}
VG_(printf)("\n");
cc->barf("parse_type_DIE: confused by the above DIE");
/*NOTREACHED*/
}
/*------------------------------------------------------------*/
/*--- ---*/
/*--- Compression of type DIE information ---*/
/*--- ---*/
/*------------------------------------------------------------*/
static UWord chase_cuOff ( Bool* changed,
XArray* /* of TyEnt */ ents,
TyEntIndexCache* ents_cache,
UWord cuOff )
{
TyEnt* ent;
ent = ML_(TyEnts__index_by_cuOff)( ents, ents_cache, cuOff );
if (!ent) {
VG_(printf)("chase_cuOff: no entry for 0x%05lx\n", cuOff);
*changed = False;
return cuOff;
}
vg_assert(ent->tag != Te_EMPTY);
if (ent->tag != Te_INDIR) {
*changed = False;
return cuOff;
} else {
vg_assert(ent->Te.INDIR.indR < cuOff);
*changed = True;
return ent->Te.INDIR.indR;
}
}
static
void chase_cuOffs_in_XArray ( Bool* changed,
XArray* /* of TyEnt */ ents,
TyEntIndexCache* ents_cache,
/*MOD*/XArray* /* of UWord */ cuOffs )
{
Bool b2 = False;
Word i, n = VG_(sizeXA)( cuOffs );
for (i = 0; i < n; i++) {
Bool b = False;
UWord* p = VG_(indexXA)( cuOffs, i );
*p = chase_cuOff( &b, ents, ents_cache, *p );
if (b)
b2 = True;
}
*changed = b2;
}
static Bool TyEnt__subst_R_fields ( XArray* /* of TyEnt */ ents,
TyEntIndexCache* ents_cache,
/*MOD*/TyEnt* te )
{
Bool b, changed = False;
switch (te->tag) {
case Te_EMPTY:
break;
case Te_INDIR:
te->Te.INDIR.indR
= chase_cuOff( &b, ents, ents_cache, te->Te.INDIR.indR );
if (b) changed = True;
break;
case Te_UNKNOWN:
break;
case Te_Atom:
break;
case Te_Field:
te->Te.Field.typeR
= chase_cuOff( &b, ents, ents_cache, te->Te.Field.typeR );
if (b) changed = True;
break;
case Te_Bound:
break;
case Te_TyBase:
break;
case Te_TyPtr:
case Te_TyRef:
case Te_TyPtrMbr:
case Te_TyRvalRef:
te->Te.TyPorR.typeR
= chase_cuOff( &b, ents, ents_cache, te->Te.TyPorR.typeR );
if (b) changed = True;
break;
case Te_TyTyDef:
te->Te.TyTyDef.typeR
= chase_cuOff( &b, ents, ents_cache, te->Te.TyTyDef.typeR );
if (b) changed = True;
break;
case Te_TyStOrUn:
chase_cuOffs_in_XArray( &b, ents, ents_cache, te->Te.TyStOrUn.fieldRs );
if (b) changed = True;
break;
case Te_TyEnum:
chase_cuOffs_in_XArray( &b, ents, ents_cache, te->Te.TyEnum.atomRs );
if (b) changed = True;
break;
case Te_TyArray:
te->Te.TyArray.typeR
= chase_cuOff( &b, ents, ents_cache, te->Te.TyArray.typeR );
if (b) changed = True;
chase_cuOffs_in_XArray( &b, ents, ents_cache, te->Te.TyArray.boundRs );
if (b) changed = True;
break;
case Te_TyFn:
break;
case Te_TyQual:
te->Te.TyQual.typeR
= chase_cuOff( &b, ents, ents_cache, te->Te.TyQual.typeR );
if (b) changed = True;
break;
case Te_TyVoid:
break;
default:
ML_(pp_TyEnt)(te);
vg_assert(0);
}
return changed;
}
/* Make a pass over 'ents'. For each tyent, inspect the target of any
'R' or 'Rs' fields (those which refer to other tyents), and replace
any which point to INDIR nodes with the target of the indirection
(which should not itself be an indirection). In summary, this
routine shorts out all references to indirection nodes. */
static
Word dedup_types_substitution_pass ( /*MOD*/XArray* /* of TyEnt */ ents,
TyEntIndexCache* ents_cache )
{
Word i, n, nChanged = 0;
Bool b;
n = VG_(sizeXA)( ents );
for (i = 0; i < n; i++) {
TyEnt* ent = VG_(indexXA)( ents, i );
vg_assert(ent->tag != Te_EMPTY);
/* We have to substitute everything, even indirections, so as to
ensure that chains of indirections don't build up. */
b = TyEnt__subst_R_fields( ents, ents_cache, ent );
if (b)
nChanged++;
}
return nChanged;
}
/* Make a pass over 'ents', building a dictionary of TyEnts as we go.
Look up each new tyent in the dictionary in turn. If it is already
in the dictionary, replace this tyent with an indirection to the
existing one, and delete any malloc'd stuff hanging off this one.
In summary, this routine commons up all tyents that are identical
as defined by TyEnt__cmp_by_all_except_cuOff. */
static
Word dedup_types_commoning_pass ( /*MOD*/XArray* /* of TyEnt */ ents )
{
Word n, i, nDeleted;
WordFM* dict; /* TyEnt* -> void */
TyEnt* ent;
UWord keyW, valW;
dict = VG_(newFM)(
ML_(dinfo_zalloc), "di.readdwarf3.dtcp.1",
ML_(dinfo_free),
(Word(*)(UWord,UWord)) ML_(TyEnt__cmp_by_all_except_cuOff)
);
nDeleted = 0;
n = VG_(sizeXA)( ents );
for (i = 0; i < n; i++) {
ent = VG_(indexXA)( ents, i );
vg_assert(ent->tag != Te_EMPTY);
/* Ignore indirections, although check that they are
not forming a cycle. */
if (ent->tag == Te_INDIR) {
vg_assert(ent->Te.INDIR.indR < ent->cuOff);
continue;
}
keyW = valW = 0;
if (VG_(lookupFM)( dict, &keyW, &valW, (UWord)ent )) {
/* it's already in the dictionary. */
TyEnt* old = (TyEnt*)keyW;
vg_assert(valW == 0);
vg_assert(old != ent);
vg_assert(old->tag != Te_INDIR);
/* since we are traversing the array in increasing order of
cuOff: */
vg_assert(old->cuOff < ent->cuOff);
/* So anyway, dump this entry and replace it with an
indirection to the one in the dictionary. Note that the
assertion above guarantees that we cannot create cycles of
indirections, since we are always creating an indirection
to a tyent with a cuOff lower than this one. */
ML_(TyEnt__make_EMPTY)( ent );
ent->tag = Te_INDIR;
ent->Te.INDIR.indR = old->cuOff;
nDeleted++;
} else {
/* not in dictionary; add it and keep going. */
VG_(addToFM)( dict, (UWord)ent, 0 );
}
}
VG_(deleteFM)( dict, NULL, NULL );
return nDeleted;
}
static
void dedup_types ( Bool td3,
/*MOD*/XArray* /* of TyEnt */ ents,
TyEntIndexCache* ents_cache )
{
Word m, n, i, nDel, nSubst, nThresh;
if (0) td3 = True;
n = VG_(sizeXA)( ents );
/* If a commoning pass and a substitution pass both make fewer than
this many changes, just stop. It's pointless to burn up CPU
time trying to compress the last 1% or so out of the array. */
nThresh = n / 200;
/* First we must sort .ents by its .cuOff fields, so we
can index into it. */
VG_(setCmpFnXA)( ents, (XACmpFn_t) ML_(TyEnt__cmp_by_cuOff_only) );
VG_(sortXA)( ents );
/* Now repeatedly do commoning and substitution passes over
the array, until there are no more changes. */
do {
nDel = dedup_types_commoning_pass ( ents );
nSubst = dedup_types_substitution_pass ( ents, ents_cache );
vg_assert(nDel >= 0 && nSubst >= 0);
TRACE_D3(" %ld deletions, %ld substitutions\n", nDel, nSubst);
} while (nDel > nThresh || nSubst > nThresh);
/* Sanity check: all INDIR nodes should point at a non-INDIR thing.
In fact this should be true at the end of every loop iteration
above (a commoning pass followed by a substitution pass), but
checking it on every iteration is excessively expensive. Note,
this loop also computes 'm' for the stats printing below it. */
m = 0;
n = VG_(sizeXA)( ents );
for (i = 0; i < n; i++) {
TyEnt *ent, *ind;
ent = VG_(indexXA)( ents, i );
if (ent->tag != Te_INDIR) continue;
m++;
ind = ML_(TyEnts__index_by_cuOff)( ents, ents_cache,
ent->Te.INDIR.indR );
vg_assert(ind);
vg_assert(ind->tag != Te_INDIR);
}
TRACE_D3("Overall: %ld before, %ld after\n", n, n-m);
}
/*------------------------------------------------------------*/
/*--- ---*/
/*--- Resolution of references to type DIEs ---*/
/*--- ---*/
/*------------------------------------------------------------*/
/* Make a pass through the (temporary) variables array. Examine the
type of each variable, check is it found, and chase any Te_INDIRs.
Postcondition is: each variable has a typeR field that refers to a
valid type in tyents, or a Te_UNKNOWN, and is certainly guaranteed
not to refer to a Te_INDIR. (This is so that we can throw all the
Te_INDIRs away later). */
__attribute__((noinline))
static void resolve_variable_types (
void (*barf)( const HChar* ) __attribute__((noreturn)),
/*R-O*/XArray* /* of TyEnt */ ents,
/*MOD*/TyEntIndexCache* ents_cache,
/*MOD*/XArray* /* of TempVar* */ vars
)
{
Word i, n;
n = VG_(sizeXA)( vars );
for (i = 0; i < n; i++) {
TempVar* var = *(TempVar**)VG_(indexXA)( vars, i );
/* This is the stated type of the variable. But it might be
an indirection, so be careful. */
TyEnt* ent = ML_(TyEnts__index_by_cuOff)( ents, ents_cache,
var->typeR );
if (ent && ent->tag == Te_INDIR) {
ent = ML_(TyEnts__index_by_cuOff)( ents, ents_cache,
ent->Te.INDIR.indR );
vg_assert(ent);
vg_assert(ent->tag != Te_INDIR);
}
/* Deal first with "normal" cases */
if (ent && ML_(TyEnt__is_type)(ent)) {
var->typeR = ent->cuOff;
continue;
}
/* If there's no ent, it probably we did not manage to read a
type at the cuOffset which is stated as being this variable's
type. Maybe a deficiency in parse_type_DIE. Complain. */
if (ent == NULL) {
VG_(printf)("\n: Invalid cuOff = 0x%05lx\n", var->typeR );
barf("resolve_variable_types: "
"cuOff does not refer to a known type");
}
vg_assert(ent);
/* If ent has any other tag, something bad happened, along the
lines of var->typeR not referring to a type at all. */
vg_assert(ent->tag == Te_UNKNOWN);
/* Just accept it; the type will be useless, but at least keep
going. */
var->typeR = ent->cuOff;
}
}
/*------------------------------------------------------------*/
/*--- ---*/
/*--- Parsing of Compilation Units ---*/
/*--- ---*/
/*------------------------------------------------------------*/
static Int cmp_TempVar_by_dioff ( const void* v1, const void* v2 ) {
const TempVar* t1 = *(const TempVar *const *)v1;
const TempVar* t2 = *(const TempVar *const *)v2;
if (t1->dioff < t2->dioff) return -1;
if (t1->dioff > t2->dioff) return 1;
return 0;
}
static void read_DIE (
/*MOD*/WordFM* /* of (XArray* of AddrRange, void) */ rangestree,
/*MOD*/XArray* /* of TyEnt */ tyents,
/*MOD*/XArray* /* of TempVar* */ tempvars,
/*MOD*/XArray* /* of GExpr* */ gexprs,
/*MOD*/D3TypeParser* typarser,
/*MOD*/D3VarParser* varparser,
Cursor* c, Bool td3, CUConst* cc, Int level
)
{
Cursor abbv;
ULong atag, abbv_code;
UWord posn;
UInt has_children;
UWord start_die_c_offset, start_abbv_c_offset;
UWord after_die_c_offset, after_abbv_c_offset;
/* --- Deal with this DIE --- */
posn = cook_die( cc, get_position_of_Cursor( c ) );
abbv_code = get_ULEB128( c );
set_abbv_Cursor( &abbv, td3, cc, abbv_code );
atag = get_ULEB128( &abbv );
TRACE_D3("\n");
TRACE_D3(" <%d><%lx>: Abbrev Number: %llu (%s)\n",
level, posn, abbv_code, ML_(pp_DW_TAG)( atag ) );
if (atag == 0)
cc->barf("read_DIE: invalid zero tag on DIE");
has_children = get_UChar( &abbv );
if (has_children != DW_children_no && has_children != DW_children_yes)
cc->barf("read_DIE: invalid has_children value");
/* We're set up to look at the fields of this DIE. Hand it off to
any parser(s) that want to see it. Since they will in general
advance both the DIE and abbrev cursors, remember their current
settings so that we can then back up and do one final pass over
the DIE, to print out its contents. */
start_die_c_offset = get_position_of_Cursor( c );
start_abbv_c_offset = get_position_of_Cursor( &abbv );
while (True) {
FormContents cts;
ULong at_name = get_ULEB128( &abbv );
ULong at_form = get_ULEB128( &abbv );
if (at_name == 0 && at_form == 0) break;
TRACE_D3(" %18s: ", ML_(pp_DW_AT)(at_name));
/* Get the form contents, but ignore them; the only purpose is
to print them, if td3 is True */
get_Form_contents( &cts, cc, c, td3, (DW_FORM)at_form );
TRACE_D3("\t");
TRACE_D3("\n");
}
after_die_c_offset = get_position_of_Cursor( c );
after_abbv_c_offset = get_position_of_Cursor( &abbv );
set_position_of_Cursor( c, start_die_c_offset );
set_position_of_Cursor( &abbv, start_abbv_c_offset );
parse_type_DIE( tyents,
typarser,
(DW_TAG)atag,
posn,
level,
c, /* DIE cursor */
&abbv, /* abbrev cursor */
cc,
td3 );
set_position_of_Cursor( c, start_die_c_offset );
set_position_of_Cursor( &abbv, start_abbv_c_offset );
parse_var_DIE( rangestree,
tempvars,
gexprs,
varparser,
(DW_TAG)atag,
posn,
level,
c, /* DIE cursor */
&abbv, /* abbrev cursor */
cc,
td3 );
set_position_of_Cursor( c, after_die_c_offset );
set_position_of_Cursor( &abbv, after_abbv_c_offset );
/* --- Now recurse into its children, if any --- */
if (has_children == DW_children_yes) {
if (0) TRACE_D3("BEGIN children of level %d\n", level);
while (True) {
atag = peek_ULEB128( c );
if (atag == 0) break;
read_DIE( rangestree, tyents, tempvars, gexprs,
typarser, varparser,
c, td3, cc, level+1 );
}
/* Now we need to eat the terminating zero */
atag = get_ULEB128( c );
vg_assert(atag == 0);
if (0) TRACE_D3("END children of level %d\n", level);
}
}
static
void new_dwarf3_reader_wrk (
struct _DebugInfo* di,
__attribute__((noreturn)) void (*barf)( const HChar* ),
DiSlice escn_debug_info, DiSlice escn_debug_types,
DiSlice escn_debug_abbv, DiSlice escn_debug_line,
DiSlice escn_debug_str, DiSlice escn_debug_ranges,
DiSlice escn_debug_loc, DiSlice escn_debug_info_alt,
DiSlice escn_debug_abbv_alt, DiSlice escn_debug_line_alt,
DiSlice escn_debug_str_alt
)
{
XArray* /* of TyEnt */ tyents;
XArray* /* of TyEnt */ tyents_to_keep;
XArray* /* of GExpr* */ gexprs;
XArray* /* of TempVar* */ tempvars;
WordFM* /* of (XArray* of AddrRange, void) */ rangestree;
TyEntIndexCache* tyents_cache = NULL;
TyEntIndexCache* tyents_to_keep_cache = NULL;
TempVar *varp, *varp2;
GExpr* gexpr;
Cursor abbv; /* for showing .debug_abbrev */
Cursor info; /* primary cursor for parsing .debug_info */
Cursor ranges; /* for showing .debug_ranges */
D3TypeParser typarser;
D3VarParser varparser;
Addr dr_base;
UWord dr_offset;
Word i, j, n;
Bool td3 = di->trace_symtab;
XArray* /* of TempVar* */ dioff_lookup_tab;
Int pass;
VgHashTable signature_types;
#if 0
/* This doesn't work properly because it assumes all entries are
packed end to end, with no holes. But that doesn't always
appear to be the case, so it loses sync. And the D3 spec
doesn't appear to require a no-hole situation either. */
/* Display .debug_loc */
Addr dl_base;
UWord dl_offset;
Cursor loc; /* for showing .debug_loc */
TRACE_SYMTAB("\n");
TRACE_SYMTAB("\n------ The contents of .debug_loc ------\n");
TRACE_SYMTAB(" Offset Begin End Expression\n");
init_Cursor( &loc, debug_loc_img,
debug_loc_sz, 0, barf,
"Overrun whilst reading .debug_loc section(1)" );
dl_base = 0;
dl_offset = 0;
while (True) {
UWord w1, w2;
UWord len;
if (is_at_end_Cursor( &loc ))
break;
/* Read a (host-)word pair. This is something of a hack since
the word size to read is really dictated by the ELF file;
however, we assume we're reading a file with the same
word-sizeness as the host. Reasonably enough. */
w1 = get_UWord( &loc );
w2 = get_UWord( &loc );
if (w1 == 0 && w2 == 0) {
/* end of list. reset 'base' */
TRACE_D3(" %08lx <End of list>\n", dl_offset);
dl_base = 0;
dl_offset = get_position_of_Cursor( &loc );
continue;
}
if (w1 == -1UL) {
/* new value for 'base' */
TRACE_D3(" %08lx %16lx %08lx (base address)\n",
dl_offset, w1, w2);
dl_base = w2;
continue;
}
/* else a location expression follows */
TRACE_D3(" %08lx %08lx %08lx ",
dl_offset, w1 + dl_base, w2 + dl_base);
len = (UWord)get_UShort( &loc );
while (len > 0) {
UChar byte = get_UChar( &loc );
TRACE_D3("%02x", (UInt)byte);
len--;
}
TRACE_SYMTAB("\n");
}
#endif
/* Display .debug_ranges */
TRACE_SYMTAB("\n");
TRACE_SYMTAB("\n------ The contents of .debug_ranges ------\n");
TRACE_SYMTAB(" Offset Begin End\n");
if (ML_(sli_is_valid)(escn_debug_ranges)) {
init_Cursor( &ranges, escn_debug_ranges, 0, barf,
"Overrun whilst reading .debug_ranges section(1)" );
dr_base = 0;
dr_offset = 0;
while (True) {
UWord w1, w2;
if (is_at_end_Cursor( &ranges ))
break;
/* Read a (host-)word pair. This is something of a hack since
the word size to read is really dictated by the ELF file;
however, we assume we're reading a file with the same
word-sizeness as the host. Reasonably enough. */
w1 = get_UWord( &ranges );
w2 = get_UWord( &ranges );
if (w1 == 0 && w2 == 0) {
/* end of list. reset 'base' */
TRACE_D3(" %08lx <End of list>\n", dr_offset);
dr_base = 0;
dr_offset = get_position_of_Cursor( &ranges );
continue;
}
if (w1 == -1UL) {
/* new value for 'base' */
TRACE_D3(" %08lx %16lx %08lx (base address)\n",
dr_offset, w1, w2);
dr_base = w2;
continue;
}
/* else a range [w1+base, w2+base) is denoted */
TRACE_D3(" %08lx %08lx %08lx\n",
dr_offset, w1 + dr_base, w2 + dr_base);
}
}
/* Display .debug_abbrev */
TRACE_SYMTAB("\n");
TRACE_SYMTAB("\n------ The contents of .debug_abbrev ------\n");
if (ML_(sli_is_valid)(escn_debug_abbv)) {
init_Cursor( &abbv, escn_debug_abbv, 0, barf,
"Overrun whilst reading .debug_abbrev section" );
while (True) {
if (is_at_end_Cursor( &abbv ))
break;
/* Read one abbreviation table */
TRACE_D3(" Number TAG\n");
while (True) {
ULong atag;
UInt has_children;
ULong acode = get_ULEB128( &abbv );
if (acode == 0) break; /* end of the table */
atag = get_ULEB128( &abbv );
has_children = get_UChar( &abbv );
TRACE_D3(" %llu %s [%s]\n",
acode, ML_(pp_DW_TAG)(atag),
ML_(pp_DW_children)(has_children));
while (True) {
ULong at_name = get_ULEB128( &abbv );
ULong at_form = get_ULEB128( &abbv );
if (at_name == 0 && at_form == 0) break;
TRACE_D3(" %18s %s\n",
ML_(pp_DW_AT)(at_name), ML_(pp_DW_FORM)(at_form));
}
}
}
}
TRACE_SYMTAB("\n");
/* We'll park the harvested type information in here. Also create
a fake "void" entry with offset D3_FAKEVOID_CUOFF, so we always
have at least one type entry to refer to. D3_FAKEVOID_CUOFF is
huge and presumably will not occur in any valid DWARF3 file --
it would need to have a .debug_info section 4GB long for that to
happen. These type entries end up in the DebugInfo. */
tyents = VG_(newXA)( ML_(dinfo_zalloc),
"di.readdwarf3.ndrw.1 (TyEnt temp array)",
ML_(dinfo_free), sizeof(TyEnt) );
{ TyEnt tyent;
VG_(memset)(&tyent, 0, sizeof(tyent));
tyent.tag = Te_TyVoid;
tyent.cuOff = D3_FAKEVOID_CUOFF;
tyent.Te.TyVoid.isFake = True;
VG_(addToXA)( tyents, &tyent );
}
{ TyEnt tyent;
VG_(memset)(&tyent, 0, sizeof(tyent));
tyent.tag = Te_UNKNOWN;
tyent.cuOff = D3_INVALID_CUOFF;
VG_(addToXA)( tyents, &tyent );
}
/* This is a tree used to unique-ify the range lists that are
manufactured by parse_var_DIE. References to the keys in the
tree wind up in .rngMany fields in TempVars. We'll need to
delete this tree, and the XArrays attached to it, at the end of
this function. */
rangestree = VG_(newFM)( ML_(dinfo_zalloc),
"di.readdwarf3.ndrw.2 (rangestree)",
ML_(dinfo_free),
(Word(*)(UWord,UWord))cmp__XArrays_of_AddrRange );
/* List of variables we're accumulating. These don't end up in the
DebugInfo; instead their contents are handed to ML_(addVar) and
the list elements are then deleted. */
tempvars = VG_(newXA)( ML_(dinfo_zalloc),
"di.readdwarf3.ndrw.3 (TempVar*s array)",
ML_(dinfo_free),
sizeof(TempVar*) );
/* List of GExprs we're accumulating. These wind up in the
DebugInfo. */
gexprs = VG_(newXA)( ML_(dinfo_zalloc), "di.readdwarf3.ndrw.4",
ML_(dinfo_free), sizeof(GExpr*) );
/* We need a D3TypeParser to keep track of partially constructed
types. It'll be discarded as soon as we've completed the CU,
since the resulting information is tipped in to 'tyents' as it
is generated. */
VG_(memset)( &typarser, 0, sizeof(typarser) );
typarser.sp = -1;
typarser.language = '?';
for (i = 0; i < N_D3_TYPE_STACK; i++) {
typarser.qparentE[i].tag = Te_EMPTY;
typarser.qparentE[i].cuOff = D3_INVALID_CUOFF;
}
VG_(memset)( &varparser, 0, sizeof(varparser) );
varparser.sp = -1;
signature_types = VG_(HT_construct) ("signature_types");
/* Do an initial pass to scan the .debug_types section, if any, and
fill in the signatured types hash table. This lets us handle
mapping from a type signature to a (cooked) DIE offset directly
in get_Form_contents. */
if (ML_(sli_is_valid)(escn_debug_types)) {
init_Cursor( &info, escn_debug_types, 0, barf,
"Overrun whilst reading .debug_types section" );
TRACE_D3("\n------ Collecting signatures from "
".debug_types section ------\n");
while (True) {
UWord cu_start_offset, cu_offset_now;
CUConst cc;
cu_start_offset = get_position_of_Cursor( &info );
TRACE_D3("\n");
TRACE_D3(" Compilation Unit @ offset 0x%lx:\n", cu_start_offset);
/* parse_CU_header initialises the CU's set_abbv_Cursor cache
(saC_cache) */
parse_CU_Header( &cc, td3, &info, escn_debug_abbv, True, False );
/* Needed by cook_die. */
cc.types_cuOff_bias = escn_debug_info.szB;
record_signatured_type( signature_types, cc.type_signature,
cook_die( &cc, cc.type_offset ));
/* Until proven otherwise we assume we don't need the icc9
workaround in this case; see the DIE-reading loop below
for details. */
cu_offset_now = (cu_start_offset + cc.unit_length
+ (cc.is_dw64 ? 12 : 4));
if (cu_offset_now >= escn_debug_types.szB)
break;
set_position_of_Cursor ( &info, cu_offset_now );
}
}
/* Perform three DIE-reading passes. The first pass reads DIEs from
alternate .debug_info (if any), the second pass reads DIEs from
.debug_info, and the third pass reads DIEs from .debug_types.
Moving the body of this loop into a separate function would
require a large number of arguments to be passed in, so it is
kept inline instead. */
for (pass = 0; pass < 3; ++pass) {
ULong section_size;
if (pass == 0) {
if (!ML_(sli_is_valid)(escn_debug_info_alt))
continue;
/* Now loop over the Compilation Units listed in the alternate
.debug_info section (see D3SPEC sec 7.5) paras 1 and 2.
Each compilation unit contains a Compilation Unit Header
followed by precisely one DW_TAG_compile_unit or
DW_TAG_partial_unit DIE. */
init_Cursor( &info, escn_debug_info_alt, 0, barf,
"Overrun whilst reading alternate .debug_info section" );
section_size = escn_debug_info_alt.szB;
TRACE_D3("\n------ Parsing alternate .debug_info section ------\n");
} else if (pass == 1) {
/* Now loop over the Compilation Units listed in the .debug_info
section (see D3SPEC sec 7.5) paras 1 and 2. Each compilation
unit contains a Compilation Unit Header followed by precisely
one DW_TAG_compile_unit or DW_TAG_partial_unit DIE. */
init_Cursor( &info, escn_debug_info, 0, barf,
"Overrun whilst reading .debug_info section" );
section_size = escn_debug_info.szB;
TRACE_D3("\n------ Parsing .debug_info section ------\n");
} else {
if (!ML_(sli_is_valid)(escn_debug_types))
continue;
init_Cursor( &info, escn_debug_types, 0, barf,
"Overrun whilst reading .debug_types section" );
section_size = escn_debug_types.szB;
TRACE_D3("\n------ Parsing .debug_types section ------\n");
}
while (True) {
ULong cu_start_offset, cu_offset_now;
CUConst cc;
/* It may be that the stated size of this CU is larger than the
amount of stuff actually in it. icc9 seems to generate CUs
thusly. We use these variables to figure out if this is
indeed the case, and if so how many bytes we need to skip to
get to the start of the next CU. Not skipping those bytes
causes us to misidentify the start of the next CU, and it all
goes badly wrong after that (not surprisingly). */
UWord cu_size_including_IniLen, cu_amount_used;
/* It seems icc9 finishes the DIE info before debug_info_sz
bytes have been used up. So be flexible, and declare the
sequence complete if there is not enough remaining bytes to
hold even the smallest conceivable CU header. (11 bytes I
reckon). */
/* JRS 23Jan09: I suspect this is no longer necessary now that
the code below contains a 'while (cu_amount_used <
cu_size_including_IniLen ...' style loop, which skips over
any leftover bytes at the end of a CU in the case where the
CU's stated size is larger than its actual size (as
determined by reading all its DIEs). However, for prudence,
I'll leave the following test in place. I can't see that a
CU header can be smaller than 11 bytes, so I don't think
there's any harm possible through the test -- it just adds
robustness. */
Word avail = get_remaining_length_Cursor( &info );
if (avail < 11) {
if (avail > 0)
TRACE_D3("new_dwarf3_reader_wrk: warning: "
"%ld unused bytes after end of DIEs\n", avail);
break;
}
/* Check the varparser's stack is in a sane state. */
vg_assert(varparser.sp == -1);
for (i = 0; i < N_D3_VAR_STACK; i++) {
vg_assert(varparser.ranges[i] == NULL);
vg_assert(varparser.level[i] == 0);
}
for (i = 0; i < N_D3_TYPE_STACK; i++) {
vg_assert(typarser.qparentE[i].cuOff == D3_INVALID_CUOFF);
vg_assert(typarser.qparentE[i].tag == Te_EMPTY);
vg_assert(typarser.qlevel[i] == 0);
}
cu_start_offset = get_position_of_Cursor( &info );
TRACE_D3("\n");
TRACE_D3(" Compilation Unit @ offset 0x%llx:\n", cu_start_offset);
/* parse_CU_header initialises the CU's set_abbv_Cursor cache
(saC_cache) */
if (pass == 0) {
parse_CU_Header( &cc, td3, &info, escn_debug_abbv_alt,
False, True );
} else {
parse_CU_Header( &cc, td3, &info, escn_debug_abbv,
pass == 2, False );
}
cc.escn_debug_str = pass == 0 ? escn_debug_str_alt
: escn_debug_str;
cc.escn_debug_ranges = escn_debug_ranges;
cc.escn_debug_loc = escn_debug_loc;
cc.escn_debug_line = pass == 0 ? escn_debug_line_alt
: escn_debug_line;
cc.escn_debug_info = pass == 0 ? escn_debug_info_alt
: escn_debug_info;
cc.escn_debug_types = escn_debug_types;
cc.escn_debug_info_alt = escn_debug_info_alt;
cc.escn_debug_str_alt = escn_debug_str_alt;
cc.types_cuOff_bias = escn_debug_info.szB;
cc.alt_cuOff_bias = escn_debug_info.szB + escn_debug_types.szB;
cc.cu_start_offset = cu_start_offset;
cc.di = di;
/* The CU's svma can be deduced by looking at the AT_low_pc
value in the top level TAG_compile_unit, which is the topmost
DIE. We'll leave it for the 'varparser' to acquire that info
and fill it in -- since it is the only party to want to know
it. */
cc.cu_svma_known = False;
cc.cu_svma = 0;
cc.signature_types = signature_types;
/* Create a fake outermost-level range covering the entire
address range. So we always have *something* to catch all
variable declarations. */
varstack_push( &cc, &varparser, td3,
unitary_range_list(0UL, ~0UL),
-1, False/*isFunc*/, NULL/*fbGX*/ );
/* And set up the file name table. When we come across the top
level DIE for this CU (which is what the next call to
read_DIE should process) we will copy all the file names out
of the .debug_line img area and use this table to look up the
copies when we later see filename numbers in DW_TAG_variables
etc. */
vg_assert(!varparser.filenameTable );
varparser.filenameTable
= VG_(newXA)( ML_(dinfo_zalloc), "di.readdwarf3.ndrw.5",
ML_(dinfo_free),
sizeof(UChar*) );
vg_assert(varparser.filenameTable);
/* Now read the one-and-only top-level DIE for this CU. */
vg_assert(varparser.sp == 0);
read_DIE( rangestree,
tyents, tempvars, gexprs,
&typarser, &varparser,
&info, td3, &cc, 0 );
cu_offset_now = get_position_of_Cursor( &info );
if (0) VG_(printf)("Travelled: %llu size %llu\n",
cu_offset_now - cc.cu_start_offset,
cc.unit_length + (cc.is_dw64 ? 12 : 4));
/* How big the CU claims it is .. */
cu_size_including_IniLen = cc.unit_length + (cc.is_dw64 ? 12 : 4);
/* .. vs how big we have found it to be */
cu_amount_used = cu_offset_now - cc.cu_start_offset;
if (1) TRACE_D3("offset now %lld, d-i-size %lld\n",
cu_offset_now, section_size);
if (cu_offset_now > section_size)
barf("toplevel DIEs beyond end of CU");
/* If the CU is bigger than it claims to be, we've got a serious
problem. */
if (cu_amount_used > cu_size_including_IniLen)
barf("CU's actual size appears to be larger than it claims it is");
/* If the CU is smaller than it claims to be, we need to skip some
bytes. Loop updates cu_offset_new and cu_amount_used. */
while (cu_amount_used < cu_size_including_IniLen
&& get_remaining_length_Cursor( &info ) > 0) {
if (0) VG_(printf)("SKIP\n");
(void)get_UChar( &info );
cu_offset_now = get_position_of_Cursor( &info );
cu_amount_used = cu_offset_now - cc.cu_start_offset;
}
/* Preen to level -2. DIEs have level >= 0 so -2 cannot occur
anywhere else at all. Our fake the-entire-address-space
range is at level -1, so preening to -2 should completely
empty the stack out. */
TRACE_D3("\n");
varstack_preen( &varparser, td3, -2 );
/* Similarly, empty the type stack out. */
typestack_preen( &typarser, td3, -2 );
TRACE_D3("set_abbv_Cursor cache: %lu queries, %lu misses\n",
cc.saC_cache_queries, cc.saC_cache_misses);
vg_assert(varparser.filenameTable );
VG_(deleteXA)( varparser.filenameTable );
varparser.filenameTable = NULL;
if (cu_offset_now == section_size)
break;
/* else keep going */
}
}
/* From here on we're post-processing the stuff we got
out of the .debug_info section. */
if (td3) {
TRACE_D3("\n");
ML_(pp_TyEnts)(tyents, "Initial type entity (TyEnt) array");
TRACE_D3("\n");
TRACE_D3("------ Compressing type entries ------\n");
}
tyents_cache = ML_(dinfo_zalloc)( "di.readdwarf3.ndrw.6",
sizeof(TyEntIndexCache) );
ML_(TyEntIndexCache__invalidate)( tyents_cache );
dedup_types( td3, tyents, tyents_cache );
if (td3) {
TRACE_D3("\n");
ML_(pp_TyEnts)(tyents, "After type entity (TyEnt) compression");
}
TRACE_D3("\n");
TRACE_D3("------ Resolving the types of variables ------\n" );
resolve_variable_types( barf, tyents, tyents_cache, tempvars );
/* Copy all the non-INDIR tyents into a new table. For large
.so's, about 90% of the tyents will by now have been resolved to
INDIRs, and we no longer need them, and so don't need to store
them. */
tyents_to_keep
= VG_(newXA)( ML_(dinfo_zalloc),
"di.readdwarf3.ndrw.7 (TyEnt to-keep array)",
ML_(dinfo_free), sizeof(TyEnt) );
n = VG_(sizeXA)( tyents );
for (i = 0; i < n; i++) {
TyEnt* ent = VG_(indexXA)( tyents, i );
if (ent->tag != Te_INDIR)
VG_(addToXA)( tyents_to_keep, ent );
}
VG_(deleteXA)( tyents );
tyents = NULL;
ML_(dinfo_free)( tyents_cache );
tyents_cache = NULL;
/* Sort tyents_to_keep so we can lookup in it. A complete (if
minor) waste of time, since tyents itself is sorted, but
necessary since VG_(lookupXA) refuses to cooperate if we
don't. */
VG_(setCmpFnXA)( tyents_to_keep, (XACmpFn_t) ML_(TyEnt__cmp_by_cuOff_only) );
VG_(sortXA)( tyents_to_keep );
/* Enable cacheing on tyents_to_keep */
tyents_to_keep_cache
= ML_(dinfo_zalloc)( "di.readdwarf3.ndrw.8",
sizeof(TyEntIndexCache) );
ML_(TyEntIndexCache__invalidate)( tyents_to_keep_cache );
/* And record the tyents in the DebugInfo. We do this before
starting to hand variables to ML_(addVar), since if ML_(addVar)
wants to do debug printing (of the types of said vars) then it
will need the tyents.*/
vg_assert(!di->admin_tyents);
di->admin_tyents = tyents_to_keep;
/* Bias all the location expressions. */
TRACE_D3("\n");
TRACE_D3("------ Biasing the location expressions ------\n" );
n = VG_(sizeXA)( gexprs );
for (i = 0; i < n; i++) {
gexpr = *(GExpr**)VG_(indexXA)( gexprs, i );
bias_GX( gexpr, di );
}
TRACE_D3("\n");
TRACE_D3("------ Acquired the following variables: ------\n\n");
/* Park (pointers to) all the vars in an XArray, so we can look up
abstract origins quickly. The array is sorted (hence, looked-up
by) the .dioff fields. Since the .dioffs should be in strictly
ascending order, there is no need to sort the array after
construction. The ascendingness is however asserted for. */
dioff_lookup_tab
= VG_(newXA)( ML_(dinfo_zalloc), "di.readdwarf3.ndrw.9",
ML_(dinfo_free),
sizeof(TempVar*) );
vg_assert(dioff_lookup_tab);
n = VG_(sizeXA)( tempvars );
Word first_primary_var = 0;
for (first_primary_var = 0;
escn_debug_info_alt.szB/*really?*/ && first_primary_var < n;
first_primary_var++) {
varp = *(TempVar**)VG_(indexXA)( tempvars, first_primary_var );
if (varp->dioff < escn_debug_info.szB + escn_debug_types.szB)
break;
}
for (i = 0; i < n; i++) {
varp = *(TempVar**)VG_(indexXA)( tempvars, (i + first_primary_var) % n );
if (i > first_primary_var) {
varp2 = *(TempVar**)VG_(indexXA)( tempvars,
(i + first_primary_var - 1) % n );
/* why should this hold? Only, I think, because we've
constructed the array by reading .debug_info sequentially,
and so the array .dioff fields should reflect that, and be
strictly ascending. */
vg_assert(varp2->dioff < varp->dioff);
}
VG_(addToXA)( dioff_lookup_tab, &varp );
}
VG_(setCmpFnXA)( dioff_lookup_tab, cmp_TempVar_by_dioff );
VG_(sortXA)( dioff_lookup_tab ); /* POINTLESS; FIXME: rm */
/* Now visit each var. Collect up as much info as possible for
each var and hand it to ML_(addVar). */
n = VG_(sizeXA)( tempvars );
for (j = 0; j < n; j++) {
TyEnt* ent;
varp = *(TempVar**)VG_(indexXA)( tempvars, j );
/* Possibly show .. */
if (td3) {
VG_(printf)("<%lx> addVar: level %d: %s :: ",
varp->dioff,
varp->level,
varp->name ? varp->name : "<anon_var>" );
if (varp->typeR) {
ML_(pp_TyEnt_C_ishly)( tyents_to_keep, varp->typeR );
} else {
VG_(printf)("NULL");
}
VG_(printf)("\n Loc=");
if (varp->gexpr) {
ML_(pp_GX)(varp->gexpr);
} else {
VG_(printf)("NULL");
}
VG_(printf)("\n");
if (varp->fbGX) {
VG_(printf)(" FrB=");
ML_(pp_GX)( varp->fbGX );
VG_(printf)("\n");
} else {
VG_(printf)(" FrB=none\n");
}
VG_(printf)(" declared at: %s:%d\n",
varp->fName ? varp->fName : "NULL",
varp->fLine );
if (varp->absOri != (UWord)D3_INVALID_CUOFF)
VG_(printf)(" abstract origin: <%lx>\n", varp->absOri);
}
/* Skip variables which have no location. These must be
abstract instances; they are useless as-is since with no
location they have no specified memory location. They will
presumably be referred to via the absOri fields of other
variables. */
if (!varp->gexpr) {
TRACE_D3(" SKIP (no location)\n\n");
continue;
}
/* So it has a location, at least. If it refers to some other
entry through its absOri field, pull in further info through
that. */
if (varp->absOri != (UWord)D3_INVALID_CUOFF) {
Bool found;
Word ixFirst, ixLast;
TempVar key;
TempVar* keyp = &key;
TempVar *varAI;
VG_(memset)(&key, 0, sizeof(key)); /* not necessary */
key.dioff = varp->absOri; /* this is what we want to find */
found = VG_(lookupXA)( dioff_lookup_tab, &keyp,
&ixFirst, &ixLast );
if (!found) {
/* barf("DW_AT_abstract_origin can't be resolved"); */
TRACE_D3(" SKIP (DW_AT_abstract_origin can't be resolved)\n\n");
continue;
}
/* If the following fails, there is more than one entry with
the same dioff. Which can't happen. */
vg_assert(ixFirst == ixLast);
varAI = *(TempVar**)VG_(indexXA)( dioff_lookup_tab, ixFirst );
/* stay sane */
vg_assert(varAI);
vg_assert(varAI->dioff == varp->absOri);
/* Copy what useful info we can. */
if (varAI->typeR && !varp->typeR)
varp->typeR = varAI->typeR;
if (varAI->name && !varp->name)
varp->name = varAI->name;
if (varAI->fName && !varp->fName)
varp->fName = varAI->fName;
if (varAI->fLine > 0 && varp->fLine == 0)
varp->fLine = varAI->fLine;
}
/* Give it a name if it doesn't have one. */
if (!varp->name)
varp->name = ML_(addStr)( di, "<anon_var>", -1 );
/* So now does it have enough info to be useful? */
/* NOTE: re typeR: this is a hack. If typeR is Te_UNKNOWN then
the type didn't get resolved. Really, in that case
something's broken earlier on, and should be fixed, rather
than just skipping the variable. */
ent = ML_(TyEnts__index_by_cuOff)( tyents_to_keep,
tyents_to_keep_cache,
varp->typeR );
/* The next two assertions should be guaranteed by
our previous call to resolve_variable_types. */
vg_assert(ent);
vg_assert(ML_(TyEnt__is_type)(ent) || ent->tag == Te_UNKNOWN);
if (ent->tag == Te_UNKNOWN) continue;
vg_assert(varp->gexpr);
vg_assert(varp->name);
vg_assert(varp->typeR);
vg_assert(varp->level >= 0);
/* Ok. So we're going to keep it. Call ML_(addVar) once for
each address range in which the variable exists. */
TRACE_D3(" ACQUIRE for range(s) ");
{ AddrRange oneRange;
AddrRange* varPcRanges;
Word nVarPcRanges;
/* Set up to iterate over address ranges, however
represented. */
if (varp->nRanges == 0 || varp->nRanges == 1) {
vg_assert(!varp->rngMany);
if (varp->nRanges == 0) {
vg_assert(varp->rngOneMin == 0);
vg_assert(varp->rngOneMax == 0);
}
nVarPcRanges = varp->nRanges;
oneRange.aMin = varp->rngOneMin;
oneRange.aMax = varp->rngOneMax;
varPcRanges = &oneRange;
} else {
vg_assert(varp->rngMany);
vg_assert(varp->rngOneMin == 0);
vg_assert(varp->rngOneMax == 0);
nVarPcRanges = VG_(sizeXA)(varp->rngMany);
vg_assert(nVarPcRanges >= 2);
vg_assert(nVarPcRanges == (Word)varp->nRanges);
varPcRanges = VG_(indexXA)(varp->rngMany, 0);
}
if (varp->level == 0)
vg_assert( nVarPcRanges == 1 );
/* and iterate */
for (i = 0; i < nVarPcRanges; i++) {
Addr pcMin = varPcRanges[i].aMin;
Addr pcMax = varPcRanges[i].aMax;
vg_assert(pcMin <= pcMax);
/* Level 0 is the global address range. So at level 0 we
don't want to bias pcMin/pcMax; but at all other levels
we do since those are derived from svmas in the Dwarf
we're reading. Be paranoid ... */
if (varp->level == 0) {
vg_assert(pcMin == (Addr)0);
vg_assert(pcMax == ~(Addr)0);
} else {
/* vg_assert(pcMin > (Addr)0);
No .. we can legitimately expect to see ranges like
0x0-0x11D (pre-biasing, of course). */
vg_assert(pcMax < ~(Addr)0);
}
/* Apply text biasing, for non-global variables. */
if (varp->level > 0) {
pcMin += di->text_debug_bias;
pcMax += di->text_debug_bias;
}
if (i > 0 && (i%2) == 0)
TRACE_D3("\n ");
TRACE_D3("[%#lx,%#lx] ", pcMin, pcMax );
ML_(addVar)(
di, varp->level,
pcMin, pcMax,
varp->name, varp->typeR,
varp->gexpr, varp->fbGX,
varp->fName, varp->fLine, td3
);
}
}
TRACE_D3("\n\n");
/* and move on to the next var */
}
/* Now free all the TempVars */
n = VG_(sizeXA)( tempvars );
for (i = 0; i < n; i++) {
varp = *(TempVar**)VG_(indexXA)( tempvars, i );
ML_(dinfo_free)(varp);
}
VG_(deleteXA)( tempvars );
tempvars = NULL;
/* and the temp lookup table */
VG_(deleteXA)( dioff_lookup_tab );
/* and the ranges tree. Note that we need to also free the XArrays
which constitute the keys, hence pass VG_(deleteXA) as a
key-finalizer. */
VG_(deleteFM)( rangestree, (void(*)(UWord))VG_(deleteXA), NULL );
/* and the tyents_to_keep cache */
ML_(dinfo_free)( tyents_to_keep_cache );
tyents_to_keep_cache = NULL;
vg_assert( varparser.filenameTable == NULL );
/* And the signatured type hash. */
VG_(HT_destruct) ( signature_types, ML_(dinfo_free) );
/* record the GExprs in di so they can be freed later */
vg_assert(!di->admin_gexprs);
di->admin_gexprs = gexprs;
}
/*------------------------------------------------------------*/
/*--- ---*/
/*--- The "new" DWARF3 reader -- top level control logic ---*/
/*--- ---*/
/*------------------------------------------------------------*/
static Bool d3rd_jmpbuf_valid = False;
static const HChar* d3rd_jmpbuf_reason = NULL;
static VG_MINIMAL_JMP_BUF(d3rd_jmpbuf);
static __attribute__((noreturn)) void barf ( const HChar* reason ) {
vg_assert(d3rd_jmpbuf_valid);
d3rd_jmpbuf_reason = reason;
VG_MINIMAL_LONGJMP(d3rd_jmpbuf);
/*NOTREACHED*/
vg_assert(0);
}
void
ML_(new_dwarf3_reader) (
struct _DebugInfo* di,
DiSlice escn_debug_info, DiSlice escn_debug_types,
DiSlice escn_debug_abbv, DiSlice escn_debug_line,
DiSlice escn_debug_str, DiSlice escn_debug_ranges,
DiSlice escn_debug_loc, DiSlice escn_debug_info_alt,
DiSlice escn_debug_abbv_alt, DiSlice escn_debug_line_alt,
DiSlice escn_debug_str_alt
)
{
volatile Int jumped;
volatile Bool td3 = di->trace_symtab;
/* Run the _wrk function to read the dwarf3. If it succeeds, it
just returns normally. If there is any failure, it longjmp's
back here, having first set d3rd_jmpbuf_reason to something
useful. */
vg_assert(d3rd_jmpbuf_valid == False);
vg_assert(d3rd_jmpbuf_reason == NULL);
d3rd_jmpbuf_valid = True;
jumped = VG_MINIMAL_SETJMP(d3rd_jmpbuf);
if (jumped == 0) {
/* try this ... */
new_dwarf3_reader_wrk( di, barf,
escn_debug_info, escn_debug_types,
escn_debug_abbv, escn_debug_line,
escn_debug_str, escn_debug_ranges,
escn_debug_loc, escn_debug_info_alt,
escn_debug_abbv_alt, escn_debug_line_alt,
escn_debug_str_alt );
d3rd_jmpbuf_valid = False;
TRACE_D3("\n------ .debug_info reading was successful ------\n");
} else {
/* It longjmp'd. */
d3rd_jmpbuf_valid = False;
/* Can't longjump without giving some sort of reason. */
vg_assert(d3rd_jmpbuf_reason != NULL);
TRACE_D3("\n------ .debug_info reading failed ------\n");
ML_(symerr)(di, True, d3rd_jmpbuf_reason);
}
d3rd_jmpbuf_valid = False;
d3rd_jmpbuf_reason = NULL;
}
/* --- Unused code fragments which might be useful one day. --- */
#if 0
/* Read the arange tables */
TRACE_SYMTAB("\n");
TRACE_SYMTAB("\n------ The contents of .debug_arange ------\n");
init_Cursor( &aranges, debug_aranges_img,
debug_aranges_sz, 0, barf,
"Overrun whilst reading .debug_aranges section" );
while (True) {
ULong len, d_i_offset;
Bool is64;
UShort version;
UChar asize, segsize;
if (is_at_end_Cursor( &aranges ))
break;
/* Read one arange thingy */
/* initial_length field */
len = get_Initial_Length( &is64, &aranges,
"in .debug_aranges: invalid initial-length field" );
version = get_UShort( &aranges );
d_i_offset = get_Dwarfish_UWord( &aranges, is64 );
asize = get_UChar( &aranges );
segsize = get_UChar( &aranges );
TRACE_D3(" Length: %llu\n", len);
TRACE_D3(" Version: %d\n", (Int)version);
TRACE_D3(" Offset into .debug_info: %llx\n", d_i_offset);
TRACE_D3(" Pointer Size: %d\n", (Int)asize);
TRACE_D3(" Segment Size: %d\n", (Int)segsize);
TRACE_D3("\n");
TRACE_D3(" Address Length\n");
while ((get_position_of_Cursor( &aranges ) % (2 * asize)) > 0) {
(void)get_UChar( & aranges );
}
while (True) {
ULong address = get_Dwarfish_UWord( &aranges, asize==8 );
ULong length = get_Dwarfish_UWord( &aranges, asize==8 );
TRACE_D3(" 0x%016llx 0x%llx\n", address, length);
if (address == 0 && length == 0) break;
}
}
TRACE_SYMTAB("\n");
#endif
#endif // defined(VGO_linux) || defined(VGO_darwin)
/*--------------------------------------------------------------------*/
/*--- end ---*/
/*--------------------------------------------------------------------*/