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This file is part of Valgrind, a dynamic binary instrumentation
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Copyright (C) 2000-2011 Julian Seward
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Copyright (C) 2000-2012 Julian Seward
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This program is free software; you can redistribute it and/or
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#elif defined(VGA_mips32)
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UChar cfa_how; /* a CFIC_ value */
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UChar ra_how; /* a CFIR_ value */
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UChar sp_how; /* a CFIR_ value */
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UChar fp_how; /* a CFIR_ value */
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# error "Unknown arch"
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true. The initial state is one in which we have no observations,
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so have_rx_map and have_rw_map are both false.
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This is all rather ad-hoc; for example it has no way to record more
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than one rw or rx mapping for a given object, not because such
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events have never been observed, but because we've never needed to
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note more than the first one of any such in order when to decide to
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read debug info. It may be that in future we need to track more
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state in order to make the decision, so this struct would then get
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This all started as a rather ad-hoc solution, but was further
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expanded to handle weird object layouts, e.g. more than one rw
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or rx mapping for one binary.
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The normal sequence of events is one of
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where the upgrade is done by a call to vm_protect. Hence we
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need to also track this possibility.
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struct _DebugInfoMapping
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Addr avma; /* these fields record the file offset, length */
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SizeT size; /* and map address of each mapping */
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Bool rx, rw, ro; /* memory access flags for this mapping */
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struct _DebugInfoFSM
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/* --- all targets --- */
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UChar* filename; /* in mallocville (VG_AR_DINFO) */
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UChar* filename; /* in mallocville (VG_AR_DINFO) */
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XArray* maps; /* XArray of _DebugInfoMapping structs */
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Bool have_rx_map; /* did we see a r?x mapping yet for the file? */
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Bool have_rw_map; /* did we see a rw? mapping yet for the file? */
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Addr rx_map_avma; /* these fields record the file offset, length */
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SizeT rx_map_size; /* and map address of the r?x mapping we believe */
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OffT rx_map_foff; /* is the .text segment mapping */
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Addr rw_map_avma; /* ditto, for the rw? mapping we believe is the */
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SizeT rw_map_size; /* .data segment mapping */
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/* --- OSX 10.7, 32-bit only --- */
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Bool have_ro_map; /* did we see a r-- mapping yet for the file? */
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Addr ro_map_avma; /* file offset, length, avma for said mapping */
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we have committed to reading the symbols and debug info (that
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is, at the point where .have_dinfo is set to True). */
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/* The file's soname. FIXME: ensure this is always allocated in
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/* The file's soname. */
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/* Description of some important mapped segments. The presence or
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Comment_on_IMPORTANT_CFSI_REPRESENTATIONAL_INVARIANTS: we require that
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either (rx_map_size == 0 && cfsi == NULL) (the degenerate case)
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either (size of all rx maps == 0 && cfsi == NULL) (the degenerate case)
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or the normal case, which is the AND of the following:
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(1) no two DebugInfos with rx_map_size > 0
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have overlapping [rx_map_avma,+rx_map_size)
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(2) [cfsi_minavma,cfsi_maxavma] does not extend
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beyond [rx_map_avma,+rx_map_size); that is, the former is a
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subrange or equal to the latter.
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(0) size of at least one rx mapping > 0
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(1) no two DebugInfos with some rx mapping of size > 0
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have overlapping rx mappings
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(2) [cfsi_minavma,cfsi_maxavma] does not extend beyond
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[avma,+size) of one rx mapping; that is, the former
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is a subrange or equal to the latter.
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(3) all DiCfSI in the cfsi array all have ranges that fall within
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[rx_map_avma,+rx_map_size).
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[avma,+size) of that rx mapping.
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(4) all DiCfSI in the cfsi array are non-overlapping
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The cumulative effect of these restrictions is to ensure that
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/* An array of guarded DWARF3 expressions. */
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XArray* admin_gexprs;
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/* Cached last rx mapping matched and returned by ML_(find_rx_mapping).
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This helps performance a lot during ML_(addLineInfo) etc., which can
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easily be invoked hundreds of thousands of times. */
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struct _DebugInfoMapping* last_rx_map;
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/* --------------------- functions --------------------- */
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if not found. Binary search. */
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extern Word ML_(search_one_fpotab) ( struct _DebugInfo* di, Addr ptr );
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/* Helper function for the most often needed searching for an rx
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mapping containing the specified address range. The range must
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fall entirely within the mapping to be considered to be within it.
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Asserts if lo > hi; caller must ensure this doesn't happen. */
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extern struct _DebugInfoMapping* ML_(find_rx_mapping) ( struct _DebugInfo* di,
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/* ------ Misc ------ */
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/* Show a non-fatal debug info reading error. Use vg_panic if
added
removed
coregrind/m_debuginfo/priv_storage.h
