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Tom Tromey 0b31a4bcec PR python/20190 - compute TLS symbol without a frame
PR python/20190 arose from an exception I noticed when trying to use
the Python unwinder for Spider Monkey in Firefox.

The problem is that the unwinder wants to examine the value of a
thread-local variable.  However, sympy_value rejects this because
symbol_read_needs_frame returns true for a TLS variable.

This problem arose once before, though in a different context:

https://sourceware.org/bugzilla/show_bug.cgi?id=11803

At the time Pedro and Daniel pointed out a simpler way to fix that bug
(see links in 20190 if you are interested); but for this new bug I
couldn't think of a similar fix and ended up implementing Daniel's
other suggestion:

https://sourceware.org/ml/gdb-patches/2010-07/msg00393.html

That is, this patch makes it possible to detect whether a symbol needs
a specific frame, or whether it just needs the inferior to have
registers.

Built and regtested on x86-64 Fedora 24.

2016-07-26  Tom Tromey  <tom@tromey.com>

	* symtab.c (register_symbol_computed_impl): Update.
	PR python/20190:
	* value.h (symbol_read_needs): Declare.
	(symbol_read_needs_frame): Add comment.
	* symtab.h (struct symbol_computed_ops) <read_variable>: Update
	comment.
	<get_symbol_read_needs>: Rename.  Change return type.
	* findvar.c (symbol_read_needs): New function.
	(symbol_read_needs_frame): Rewrite.
	(default_read_var_value): Use symbol_read_needs.
	* dwarf2loc.c (struct symbol_needs_baton): Rename.
	<needs>: Renamed from needs_frame.  Changed type.
	(needs_frame_read_addr_from_reg, symbol_needs_get_reg_value)
	(symbol_needs_read_mem, symbol_needs_frame_base)
	(symbol_needs_frame_cfa, symbol_needs_tls_address)
	(symbol_needs_dwarf_call): Rename.
	(needs_dwarf_reg_entry_value): Update.
	(symbol_needs_ctx_funcs, dwarf2_loc_desc_get_symbol_read_needs):
	Rename and update.
	(locexpr_get_symbol_read_needs, loclist_symbol_needs): Likewise.
	(dwarf2_locexpr_funcs, dwarf2_loclist_funcs): Update.
	* defs.h (enum symbol_needs_kind): New.

2016-07-26  Tom Tromey  <tom@tromey.com>

	PR python/20190:
	* gdb.threads/tls.exp (check_thread_local): Add python symbol
	test.
2016-07-26 13:43:27 -06:00
bfd MIPS/BFD: Handle branches in PLT compression selection 2016-07-26 20:00:48 +01:00
binutils Set BFD_VERSION to 2.27.51 2016-07-21 15:22:13 -07:00
config
cpu
elfcpp Add support for MIPS .rld_map section. 2016-06-20 12:16:26 -07:00
etc Fix compile time warning messages building with gcc v6.1.1 2016-06-13 10:49:26 +01:00
gas MIPS/GAS: Respect the `insn32' mode in branch relaxation 2016-07-26 20:00:49 +01:00
gdb PR python/20190 - compute TLS symbol without a frame 2016-07-26 13:43:27 -06:00
gold [Gold, aarch64] Implement some AArch64 relocs. 2016-07-26 08:55:14 -07:00
gprof Set BFD_VERSION to 2.27.51 2016-07-21 15:22:13 -07:00
include Add support to the ARC disassembler for selecting instruction classes. 2016-07-20 17:08:07 +01:00
intl
ld MIPS/BFD: Handle branches in PLT compression selection 2016-07-26 20:00:48 +01:00
libdecnumber
libiberty
opcodes Set BFD_VERSION to 2.27.51 2016-07-21 15:22:13 -07:00
readline
sim Fix typo fsqrt -> sqrtf. 2016-07-21 09:23:16 +01:00
texinfo
zlib
.cvsignore
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ChangeLog Enable the configuration of GDB for the NDS32 target. 2016-07-20 09:06:39 +01:00
compile
config-ml.in
config.guess
config.rpath
config.sub
configure Enable the configuration of GDB for the NDS32 target. 2016-07-20 09:06:39 +01:00
configure.ac Enable the configuration of GDB for the NDS32 target. 2016-07-20 09:06:39 +01:00
COPYING
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COPYING.LIBGLOSS
COPYING.NEWLIB
COPYING3
COPYING3.LIB
depcomp
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install-sh
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ltgcc.m4
ltmain.sh
ltoptions.m4
ltsugar.m4
ltversion.m4
lt~obsolete.m4
MAINTAINERS
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		   README for GNU development tools

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