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([2001:8a0:f924:2600:209d:85e2:409e:8726]) by smtp.gmail.com with ESMTPSA id y15-20020adfee0f000000b0020c5253d8dbsm1766189wrn.39.2022.05.26.05.26.08 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 26 May 2022 05:26:08 -0700 (PDT) Message-ID: <18ef47c5-43cf-e38a-41c6-506f43ae5af2@palves.net> Date: Thu, 26 May 2022 13:26:07 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.9.0 Subject: [PATCH v3] gdb/manual: Introduce location specs Content-Language: en-US To: Eli Zaretskii Cc: gdb-patches@sourceware.org References: <20220525193126.1613411-1-pedro@palves.net> <83mtf5perq.fsf@gnu.org> <1a48f5fd-e545-00a7-e657-55dd4ec41c74@palves.net> <83bkvkpz3a.fsf@gnu.org> From: Pedro Alves In-Reply-To: <83bkvkpz3a.fsf@gnu.org> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Spam-Status: No, score=-9.9 required=5.0 tests=BAYES_00, FREEMAIL_FORGED_FROMDOMAIN, FREEMAIL_FROM, GIT_PATCH_0, HEADER_FROM_DIFFERENT_DOMAINS, KAM_DMARC_STATUS, RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2, SPF_HELO_NONE, SPF_PASS, TXREP, T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: gdb-patches@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gdb-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 26 May 2022 12:26:18 -0000 On 2022-05-26 07:50, Eli Zaretskii wrote: >> Thus, is this version OK to apply? > > Unfortunately, no. Please see the comments below. Thanks for the review. Much appreciated. Hopefully we're getting closer to meeting in the middle. >> +@item break @var{locspec} >> +Set a breakpoint at all the locations the given @var{locspec} matches. > > This should say something like > > Set a breakpoint at all the program addresses that match the > @dfn{location specification} @var{locspec}. > > We could also use "all the places in the program code" instead of "all > the program addresses". Or maybe you or someone else will be able to > propose other alternatives. But we should not use "location" to mean > the actual resolved address where the breakpoint will break. I like many of the suggestions you made in this direction for e.g., the "list" command and others. But not for breakpoints. (now, the following few replies to your comments happen to all be in the area, but if you look further below, I agree with your suggestions a lot more...) Because what you suggest above is not equivalent: what really happens is that we do set a breakpoint at each location {address, function name, filename, line} in the program that matches the spec. Recall my inline functions example in the other thread. If we think only in terms of addresses, GDB would behave differently in that inlines example. It's not just the address that matters. Like in geography, you can think of locations having coordinates (e.g., {x,y,z}), and address is just one of them. Like below for example, you start with a locspec like "main", and the breakpoint is set at ..../gdb.c:25. (top-gdb) b main (top-gdb) info breakpoints Num Type Disp Enb Address What 3 breakpoint keep y 3.1 y 0x00000000000ed06c in main(int, char**) at /home/pedro/gdb/binutils-gdb/src/gdb/gdb.c:25 All the info in the "Address" and "What" columns above define the coordinates of the location in the program, not just the address. The function name is important. The line number is important. Etc. The set breakpoint is then implemented by placing a breakpoint instruction at the address of each of the breakpoint's locations. This is what we need to convey. Just talking about addresses is only talking about the implementation detail, not what the users see, and not all that matters about each location. I also would like the text to make sense once we make "info breakpoints" display the breakpoint locations the same way regardless of how many locations the breakpoint is set at. > >> +@var{locspec} can specify a function name, a line number, an address >> +of an instruction, and more. @xref{Location Specifications}, for the >> +various forms of @var{locspec}. The breakpoint will stop your program >> +just before it executes any of the code at any of the breakpoint's >> +locations. > ^^^^^^^^^ > "addresses", not "locations". I think it should be both. "breakpoint's locations' addresses". I went with that. > >> +It is possible that a breakpoint corresponds to several locations in >> +your program. @xref{Location Specifications}, for examples. > > I would rephrase: > > It is possible that a breakpoint's location spec corresponds to > several places in your program. IMO, it just adds to confusion. The cindex (just above) is called "multiple locations". There's is nothing wrong with saying "locations". We have been saying "location" all these years. Only the xref needs to change, which is what I was doing. > >> @value{GDBN} provides some additional commands for controlling what >> -happens when the @samp{break} command cannot resolve breakpoint >> -address specification to an address: >> +happens when the @samp{break} command cannot find any location that >> +matches the location spec (@pxref{Location Specifications}): > > This should say "...cannot resolve the breakpoint's location spec to > an address". IOW, the only problem in the original text was with > using "address specification", where we now want to use "location > specification" instead. Yes, but it's not as correct. If "break" didn't find any location {line number, function name, etc.) that matches whatever was specified in the location spec, then the breakpoint ends up with no breakpoint locations, and in that particular case, the breakpoint is called a pending breakpoint. If GDB manages to create a breakpoint location for the breakpoint later, when new symbols are loaded, and _afterwards_ the code at that location goes away (due to shared library unload, for example), the breakpoint doesn't go back to being a pending breakpoint -- GDB will remember the location where the breakpoint location was set at, with only the _address_ of the location being unresolved, not the breakpoint itself. I had text about this in the "info breakpoints" patch. Once we get to make "info breakpoints" always list the breakpoints the same way whether they have 0, 1 or more locations, then it makes a lot of sense to describe pending breakpoints like that -- they have 0 locations. And if we use the same terminology here, everything is cohesive. I've added "in the program" to make it a bit clearer. > >> @kindex set breakpoint pending >> @kindex show breakpoint pending >> @table @code >> @item set breakpoint pending auto >> -This is the default behavior. When @value{GDBN} cannot find the breakpoint >> -location, it queries you whether a pending breakpoint should be created. >> +This is the default behavior. When @value{GDBN} cannot find any >> +location that matches the location spec, it queries you whether a >> +pending breakpoint should be created. > > "When @value{GDBN} cannot resolve the breakpoint's location spec to an > address, it queries you whether..." > >> @item set breakpoint pending on >> -This indicates that an unrecognized breakpoint location should automatically >> -result in a pending breakpoint being created. >> +This indicates that when @value{GDBN} cannot find any location that >> +matches the location spec, it should create a pending breakpoint >> +without asking for confirmation. > > "This indicates that when @value{GDBN} cannot resolve a location spec, > it should create a @dfn{pending breakpoint} without asking for > confirmation." Done. > >> @item set breakpoint pending off >> -This indicates that pending breakpoints are not to be created. Any >> -unrecognized breakpoint location results in an error. This setting does >> +This indicates that pending breakpoints are not to be created. If >> +@value{GDBN} cannot find any location that matches the location spec, >> +it aborts the breakpoint creation with an error. This setting does >> not affect any pending breakpoints previously created. > > Similar rephrasing here. Done. > >> The settings above only affect the @code{break} command and its >> -variants. Once breakpoint is set, it will be automatically updated >> -as shared libraries are loaded and unloaded. >> +variants. Once a breakpoint is created, it will be automatically >> +updated as shared libraries are loaded and unloaded. > > I don't necessarily object, but can you tell why "breakpoint is set" > was not good enough? After all the description of the "break" command > says "Set a breakpoint...", so the original text here was being > consistent with that. No good reason. Done. > >> -@item clear @var{location} >> -Delete any breakpoints set at the specified @var{location}. >> -@xref{Specify Location}, for the various forms of @var{location}; the >> -most useful ones are listed below: >> +@item clear @var{locspec} >> +Delete any breakpoints set at the locations that match @var{locspec}. > > "Delete any breakpoints set at addresses that match the location spec > @var{locspec}." No, that is ambiguous, it kind of suggests that you can only pass address location specs here. The old text talked about "location", and I think we should continue doing so. It is just that we can now be unambiguous with location vs location spec. The command isn't driven by addresses solely. See clear_command. If the locspec specifies a line, then the command matches breakpoint locations by line, and when it specifies explicit addresses, it matches locations by address. The algorithm is different. The text goes on to say "the most useful ones are listed below:", and then explain in more detail how it behaves with different locspecs. So I think this should stay as I proposed. > >> +Whenever execution reaches a location that matches @var{locspec}, >> +print the values of one or more @var{expressions} under the control of >> +the string @var{template}. To print several values, separate them >> +with commas. > > "Whenever execution reaches an address that matches @var{locspec}, ..." > Addresses only match location specs if you start with an address location spec, like "dprintf *ADDRESS". The original text already said: Whenever execution reaches @var{location} So strip away the "@var" as it is lo longer a variable, and this is already saying -- Whenever execution reaches location. Since we now can distinguish between program location and the syntaxes used to specify a location, it makes sense to extend that to say: Whenever execution reaches the location that matches the @var{locspec}. and since locspec can resolve to multiple locations, just like a breakpoint, we just adjust to use plural form, like: Whenever execution reaches a location that matches @var{locspec}. If the locspec is a line number, this can by read as "whenever execution reaches the line number that matches the line number specified by locspec. If the locspec is a function name, this can be read as "whenever execution read the function that matches the function specified by locspec." Etc. It just makes sense that way. Please let's not shy away from "location" as if it was a forbidden word. > >> Functions may be skipped by providing either a function name, linespec > ^^^^^^^^^^^^^^^^^^^^^^^ > Does "skip" support only some of the location specification formats? If > it supports all of them, we should just say "location specification" > there instead of using these two terms. It doesn't: (top-gdb) skip *0x000000000086def1 Function *0x000000000086def1 will be skipped when stepping. (top-gdb) info skip Num Enb Glob File RE Function 1 y n n *0x000000000086def1 (top-gdb) skip -line 10 Invalid skip option: -line > >> +In general, the @code{list} command expects you to supply zero, one or >> +two location specs. The location specs specify source lines; there >> +are several ways of writing them (@pxref{Location Specifications}), >> +but the effect is always to specify some source line. > > The last sentence should say > > "These location specs are interpreted to specify source code lines; > there are several ways of writing them (@pxref{Location > Specifications}), but the effect is always to specify some source > lines to display." I like that. Done. > >> +@item list @var{locspec} >> +Print lines centered around the line or lines for the locations that >> +match @var{locspec}. > > "Print lines centered around the line or lines for the addresses that > match @var{linespec}." I take it you mean "for the lines". I went with: Print lines centered around the line or lines that @var{locspec} resolves to. > >> @item list @var{first},@var{last} >> Print lines from @var{first} to @var{last}. Both arguments are >> -locations. When a @code{list} command has two locations, and the >> -source file of the second location is omitted, this refers to >> -the same source file as the first location. >> +location specs. When a @code{list} command has two location specs, and the source >> +file of the second location spec is omitted, this refers to the same source >> +file as the first location spec. If either @var{first} or @var{last} match >> +more than one location in the program, then the list command will >> +print the list of ambiguous locations and does not print any source >> +lines. > > The last sentence should say > > "If either @var{first} or @var{last} match more than one source line > in the program, the @code{list} command will show the list of > ambiguous source lines, and will not print any source lines." I like the first part about matching lines, but I think "show the list of ambiguous source lines" is worse, because it's ambiguous that way -- it ends up with "source lines" used twice to mean different things. The first refers to the location in the program, the second refers to the contents of source code at the lines. And, GDB prints more location coordinates than lines when ambiguous: file: "/home/pedro/gdb/binutils-gdb/src/gdb/gdb.c", line number: 25, symbol: "main(int, char**)" file: "/home/pedro/gdb/binutils-gdb/src/gdb/unittests/basic_string_view/cons/char/1.cc", line number: 61, symbol: "selftests::string_view::cons_1::main()" file: "/home/pedro/gdb/binutils-gdb/src/gdb/unittests/basic_string_view/cons/char/2.cc", line number: 40, symbol: "selftests::string_view::cons_2::main()" ... So for now I changed the first part per your suggestion, and kept "list of ambiguous locations". > >> +Likewise, if @var{last} matches more than one location in the program, >> +then the list command will print the list of ambiguous locations and >> +does not print any source lines. > > Likewise here. Done. > >> +A location spec serves as a blueprint, and it may match more than one >> +actual location in your program. Examples of this situation are: > ^^^^^^^^ > "address". > We're defining a location spec here, so that would be an overcorrection. There's nothing wrong with referring to "a location in the program". It's even exposed to C++ users in the language itself: https://en.cppreference.com/w/cpp/utility/source_location This should really say that specifications match actual locations. The "spec" qualifier in "location spec" makes this unambiguous, and the point is really to distinguish the "spec" from the actual "thing". It is no different from saying: "a cake specification serves as a blueprint, and it may match more than one actual cake in the cake shop". There is nothing ambiguous in this sentence using cakes. And I am saying the exact same thing, but for locations. I did notice that I forgot to add a @dfn{location specification}. I did that now, in that paragraph quoted above. >> +@item edit @var{locspec} >> +Edit the source file specified by @code{locspec}. Editing starts at >> +the specified location, e.g., at the specified source line of the >> +specified file. @xref{Location Specifications}, for all the possible >> +forms of the @var{locspec} argument. >> + >> +If @code{locspec} matches more than one location in your program, then > ^^^^^^^^ > "source line" > >> +the command prints the list of locations and does not proceed with the > ^^^^^^^^^ > "source lines" Done. > >> We can also inquire (using @code{*@var{addr}} as the form for >> -@var{location}) what source line covers a particular address: >> +@var{locspec}) what source line covers a particular address: > > "You can also inquire (using @code{*@var{addr}} as the form for > @var{locspec}) what source line covers a particular address > @var{addr}:" AFAICS, you're suggesting to add "@var{addr}". I don't think that would be correct without other changes. Try reading the sentence without the parenthesis, it wouldn't make sense then: "You can also inquire what source line covers a particular address @var{addr}:" because "addr" is not referred to in the example that follows, it is only referring to the addr in the parenthesized part. So I think that if you want to add "addr" here, the sentence should be tweaked further. I'm only after changing the name of the @var{location} variable, though. > >> +@item info macros @var{locspec} >> +Show all macro definitions that are in effect at the first location in >> +your program that matches @var{locspec}, and describe the source >> +location or compiler command-line where those definitions were >> +established. > > "Show all macro definitions that are in effect at the first address in > your program that matches @var{locspec}, and describe the place in the > source code or compiler command-line where those definitions were > established." What we had before is better -- referring to addresses here is confusing. Macros is a source concept, while addresses are lower level. Please let's keep using "location", just like we said before my change. There is no ambiguity here. > >> The @code{strace} command sets a static tracepoint. For targets that >> support it, setting a static tracepoint probes a static >> -instrumentation point, or marker, found at @var{location}. It may not >> -be possible to set a static tracepoint at the desired location, in >> -which case the command will exit with an explanatory message. >> +instrumentation point, or marker, found at the locations that match >> +@var{locspec}. ^^^^^^^^^ > > "addresses" > >> It may not be possible to set a static tracepoint at >> +the desired location, in which case the command will exit with an > > "It may not be possible to set a static tracepoint at any address that > matches @var{locspec}, in which case..." > >> @value{GDBN} handles arguments to @code{strace} exactly as for >> @code{trace}, with the addition that the user can also specify >> -@code{-m @var{marker}} as @var{location}. This probes the marker >> +@code{-m @var{marker}} as location. This probes the marker > > "...the user can also specify @code{-m @var{marker}} instead of a > location spec." I like this one, done. > >> -@item info scope @var{location} >> +@item info scope @var{locspec} >> List all the variables local to a particular scope. This command >> -accepts a @var{location} argument---a function name, a source line, or >> -an address preceded by a @samp{*}, and prints all the variables local >> -to the scope defined by that location. (@xref{Specify Location}, for >> -details about supported forms of @var{location}.) For example: >> +accepts a location specification argument---a function name, a source >> +line, or an address preceded by a @samp{*}, and prints all the >> +variables local to the scope defined by the first location in your > ^^^^^^^^ > "address" or "place". > "address" here is confusing in the same way. There's nothing wrong with using "location" here. "place" is just odd since we never define what it is. Please, let's not avoid "location" just because. The text is not ambiguous with it, as we distinguish "location spec" from "location". If we used "place" instead of "location" throughout, then we should have a "place spec" instead of a "location spec". >> +@item jump @var{locspec} >> +@itemx j @var{locspec} >> +Resume execution at the location that matches @var{locspec}. > ^^^^^^^^ > "address" Since fine to say address in this case, but I think we should say "resolves to" instead of matches, because using "matches" along with "address" kind of suggests that you should pass down an address locspec. "Resolves to" removes that ambiguity. > >> +@xref{Location Specifications}, for a description of the different >> +forms of @var{locspec}. If @var{locspec} matches more than one >> +location, the command aborts before jumping to any location. > ^^^^^^^^ > "address". And "to any location" at the end can be simply removed. I went with "resolving" here too, like: If @var{locspec} resolves to more than one address, the command aborts before jumping. > >> The @code{jump} command does not change the current stack frame, or >> the stack pointer, or the contents of any memory location or any >> -register other than the program counter. If @var{location} is in >> -a different function from the one currently executing, the results may >> -be bizarre if the two functions expect different patterns of arguments or >> -of local variables. For this reason, the @code{jump} command requests >> -confirmation if the specified line is not in the function currently >> -executing. However, even bizarre results are predictable if you are >> -well acquainted with the machine-language code of your program. >> +register other than the program counter. If @var{locspec} matches a >> +location in a different function from the one currently executing, the > ^^^^^^^^ > "address" Done. > >> +@item break-range @var{start-locspec}, @var{end-locspec} >> Set a breakpoint for an address range given by >> -@var{start-location} and @var{end-location}, which can specify a function name, >> +@var{start-locspec} and @var{end-locspec}, which can specify a function name, >> a line number, an offset of lines from the current line or from the start >> -location, or an address of an instruction (see @ref{Specify Location}, >> -for a list of all the possible ways to specify a @var{location}.) >> +location, or an address of an instruction (see @ref{Location Specifications}, >> +for a list of all the possible ways to specify a location spec). >> +If either @var{start-locspec} or @var{end-locspec} match multiple >> +locations in the program, then the command aborts with an error > ^^^^^^^^^ > "addresses" Done. > >> @smallexample >> - -exec-until [ @var{location} ] >> + -exec-until [ @var{locspec} ] >> @end smallexample >> >> -Executes the inferior until the @var{location} specified in the >> -argument is reached. If there is no argument, the inferior executes >> -until a source line greater than the current one is reached. The >> -reason for stopping in this case will be @samp{location-reached}. >> +Executes the inferior until a location that matches @var{locspec} is >> +reached. > > "Executes the inferior until it reaches an address that matches > @var{locspec}." I think that reads worse than before. It was good to say "location" before my change, so it should still be good after. Please let's not overcorrect here. Notice how the text talks about source lines in the following sentence. We don't have to talk about lower level addresses. It's better for users to think about reaching some location in the program, like a line number for example. > >> @item line >> -Line specification is required as parameter. @xref{Specify Location}. >> +Line specification is required as parameter. @xref{Location Specifications}. > ^^^^^^^^^^^^^^^^^^ > "Line specification" or "location specification"? I looked now, and this really accepts any form, so should be changed to "location specification": (top-gdb) interpreter-exec mi "-trace-find line \"-function foo\"" ^done,found="0",frame={level="0",addr="0x000055555564106c",func="main",args=[{name="argc",value="1"},{name="argv",value="0x7fffffffdc48"}],file="/home/pedro/gdb/binutils-gdb/src/gdb/gdb.c",fullname="/net/cascais.nfs/brno/pedro/gdb/binutils-gdb/src/gdb/gdb.c",line="25",arch="i386:x86-64"} (top-gdb) interpreter-exec mi "-trace-find line \"-foo\"" ^error,msg="invalid explicit location argument, \"-foo\"" (top-gdb) interpreter-exec mi "-trace-find line *0x000055555564106c" ^done,found="0",frame={level="0",addr="0x000055555564106c",func="main",args=[{name="argc",value="1"},{name="argv",value="0x7fffffffdc48"}],file="/home/pedro/gdb/binutils-gdb/src/gdb/gdb.c",fullname="/net/cascais.nfs/brno/pedro/gdb/binutils-gdb/src/gdb/gdb.c",line="25",arch="i386:x86-64"} So, done. > >> -If @code{-at} is given, generate remote agent bytecode for @var{location}. >> +If @code{-at} is given, generate remote agent bytecode for all >> +locations that match @var{linespec} (@pxref{Linespec Locations}). > > Same question here. (I mentioned this one in the commit log.) This command only accepts the linespec format, so "Line specification" is correct here. if (check_for_argument (&exp, "-at", sizeof ("-at") - 1)) { struct linespec_result canonical; event_location_up location = new_linespec_location (&exp, symbol_name_match_type::WILD); ^^^^^^^^^^^^^^^^^^^^^ Trying other formats gets you: (top-gdb) maint agent -at *0x123 Function "*0x123" not defined. (top-gdb) maint agent -at -function main Function "-function main" not defined. > > Thanks. > Thank you. Here's v3. I've also updated the commit log to match. >From 28700550b760519f6c49979a1d58b30aa9a2ceac Mon Sep 17 00:00:00 2001 From: Pedro Alves Date: Tue, 17 May 2022 13:12:04 +0100 Subject: [PATCH v3] gdb/manual: Introduce location specs The current "Specify Location" section of the GDB manual starts with: "Several @value{GDBN} commands accept arguments that specify a location of your program's code." And then, such commands are documented as taking a "location" argument. For example, here's a representative subset: @item break @var{location} @item clear @var{location} @item until @var{location} @item list @var{location} @item edit @var{location} @itemx info line @var{location} @item info macros @var{location} @item trace @var{location} @item info scope @var{location} @item maint agent @r{[}-at @var{location}@r{,}@r{]} @var{expression} The issue here is that "location" isn't really correct for most of these commands. Instead, the "location" argument is really a placeholder that represent an umbrella term for all of the "linespecs", "explicit location", and "address location" input formats. GDB parses these and then finds the actual locations (plural) in the program that match. For example, a "location" specified like "-function func" will actually match all the locations in the program that correspond to the address/file/lineno of all the functions named "func" in all the loaded programs and shared libraries of all the inferiors. A "location" specified like "-label lab" matches all the addresses & source lines of where a C label name "lab" is defined. Etc. This means that several of the commands that claim they accept a "location", actually end up working with multiple locations, and the manual doesn't explain that all that well. In some cases, the command will work with all the matched locations. In other cases, the command aborts with an error if the location specification matches multiple locations in the program. In other cases, GDB just arbitrarily and silently picks whatever is the first location that matches (which sounds like should be improved). To clarify this, I propose we use the term "Location Specification", with shorthand "locaction spec", when we're talking about the user input, the argument or arguments that is/are passed to commands to instruct GDB how to find locations of interest. This is distinct from the actual locations in the program, which are what GDB finds based on the user-specified location spec. Then use "location specification or the shorter "location spec" thoughout instead of "location" when we're talking about the user input. Thus, this commit does the following: - renames the "Specify Location" section of the manual to "Location Specifications". - It then introduces the term "Location Specification", with corresponding shorthand "location spec", as something distinct from an actual location in the program. It explains that a location specification may match multiple locations in the program. It gives examples of how that happens. Most examples were moved from the "Set Breaks" section, and a couple new ones that didn't exist yet were added. I think it is better to have these centralized in this "Location Specification" section, since all the other commands that accept a location spec have an xref that points there. - Goes through the manual, and where "@var{location}" was used for a command argument, updated it to say "@var{locspec}" instead. At the same time, tweaks the description of the affected commands to describe what happens when the location spec matches more than one location in the program. Most commands just did not say anything about that. One command -- "maint agent -at @var{location}" -- currently says it accepts a "location", suggesting it can accept address and explicit locations too, but that's incorrect. In reality, it only accepts linespecs, so fix it accordingly. One MI command -- "-trace-find line" -- currently says it accepts a "line specification", but it can accept address and explicit locations too, so fix it accordingly. Change-Id: Ic42ad8565e79ca67bfebb22cbb4794ea816fd08b --- gdb/doc/gdb.texinfo | 374 ++++++++++++++++++++++++-------------------- gdb/doc/guile.texi | 2 +- gdb/doc/python.texi | 5 +- 3 files changed, 210 insertions(+), 171 deletions(-) diff --git a/gdb/doc/gdb.texinfo b/gdb/doc/gdb.texinfo index 68679982919..32797b16596 100644 --- a/gdb/doc/gdb.texinfo +++ b/gdb/doc/gdb.texinfo @@ -2024,7 +2024,7 @@ func() func() (@value{GDBP}) p 'func< @end smallexample -When setting breakpoints however (@pxref{Specify Location}), you don't +When setting breakpoints however (@pxref{Location Specifications}), you don't usually need to type a quote before the function name, because @value{GDBN} understands that you want to set a breakpoint on a function: @@ -4343,17 +4343,19 @@ Vars,, Convenience Variables}, for a discussion of what you can do with convenience variables. @table @code -@item break @var{location} -Set a breakpoint at the given @var{location}, which can specify a -function name, a line number, or an address of an instruction. -(@xref{Specify Location}, for a list of all the possible ways to -specify a @var{location}.) The breakpoint will stop your program just -before it executes any of the code in the specified @var{location}. +@item break @var{locspec} +Set a breakpoint at all the locations the given @var{locspec} matches. +@var{locspec} can specify a function name, a line number, an address +of an instruction, and more. @xref{Location Specifications}, for the +various forms of @var{locspec}. The breakpoint will stop your program +just before it executes any of the code at any of the breakpoint's +locations' adresses. -When using source languages that permit overloading of symbols, such as -C@t{++}, a function name may refer to more than one possible place to break. -@xref{Ambiguous Expressions,,Ambiguous Expressions}, for a discussion of -that situation. +When using source languages that permit overloading of symbols, such +as C@t{++}, a function name may refer to more than one symbol, and +thus more than one place to break. @xref{Ambiguous +Expressions,,Ambiguous Expressions}, for a discussion of that +situation. It is also possible to insert a breakpoint that will stop the program only if a specific thread (@pxref{Thread-Specific Breakpoints}) @@ -4614,28 +4616,8 @@ the breakpoints are conditional, this is even useful @cindex multiple locations, breakpoints @cindex breakpoints, multiple locations -It is possible that a breakpoint corresponds to several locations -in your program. Examples of this situation are: - -@itemize @bullet -@item -Multiple functions in the program may have the same name. - -@item -For a C@t{++} constructor, the @value{NGCC} compiler generates several -instances of the function body, used in different cases. - -@item -For a C@t{++} template function, a given line in the function can -correspond to any number of instantiations. - -@item -For an inlined function, a given source line can correspond to -several places where that function is inlined. -@end itemize - -In all those cases, @value{GDBN} will insert a breakpoint at all -the relevant locations. +It is possible that a breakpoint corresponds to several locations in +your program. @xref{Location Specifications}, for examples. A breakpoint with multiple locations is displayed in the breakpoint table using several rows---one header row, followed by one row for @@ -4711,31 +4693,34 @@ differ from regular breakpoints. You can set conditions or commands, enable and disable them and perform other breakpoint operations. @value{GDBN} provides some additional commands for controlling what -happens when the @samp{break} command cannot resolve breakpoint -address specification to an address: +happens when the @samp{break} command cannot find any location in the +program that matches the location spec (@pxref{Location +Specifications}): @kindex set breakpoint pending @kindex show breakpoint pending @table @code @item set breakpoint pending auto -This is the default behavior. When @value{GDBN} cannot find the breakpoint -location, it queries you whether a pending breakpoint should be created. +This is the default behavior. When @value{GDBN} cannot resolve the +location spec, it should create a pending breakpoint without +confirmation. @item set breakpoint pending on -This indicates that an unrecognized breakpoint location should automatically -result in a pending breakpoint being created. +This indicates that when @value{GDBN} cannot resolve the location +spec, it should create a pending breakpoint without confirmation. @item set breakpoint pending off -This indicates that pending breakpoints are not to be created. Any -unrecognized breakpoint location results in an error. This setting does -not affect any pending breakpoints previously created. +This indicates that pending breakpoints are not to be created. If +@value{GDBN} cannot resolve the location spec, it aborts the +breakpoint creation with an error. This setting does not affect any +pending breakpoints previously created. @item show breakpoint pending Show the current behavior setting for creating pending breakpoints. @end table The settings above only affect the @code{break} command and its -variants. Once breakpoint is set, it will be automatically updated +variants. Once a breakpoint is set, it will be automatically updated as shared libraries are loaded and unloaded. @cindex automatic hardware breakpoints @@ -5455,10 +5440,10 @@ selected stack frame (@pxref{Selection, ,Selecting a Frame}). When the innermost frame is selected, this is a good way to delete a breakpoint where your program just stopped. -@item clear @var{location} -Delete any breakpoints set at the specified @var{location}. -@xref{Specify Location}, for the various forms of @var{location}; the -most useful ones are listed below: +@item clear @var{locspec} +Delete any breakpoints with locations that match @var{locspec}. +@xref{Location Specifications}, for the various forms of +@var{locspec}; the most useful ones are listed below: @table @code @item clear @var{function} @@ -5815,10 +5800,11 @@ everything without needing to communicate with @value{GDBN}. @table @code @kindex dprintf -@item dprintf @var{location},@var{template},@var{expression}[,@var{expression}@dots{}] -Whenever execution reaches @var{location}, print the values of one or -more @var{expressions} under the control of the string @var{template}. -To print several values, separate them with commas. +@item dprintf @var{locspec},@var{template},@var{expression}[,@var{expression}@dots{}] +Whenever execution reaches a location that matches @var{locspec}, +print the values of one or more @var{expressions} under the control of +the string @var{template}. To print several values, separate them +with commas. @item set dprintf-style @var{style} Set the dprintf output to be handled in one of several different @@ -6313,11 +6299,11 @@ statement---not in terms of the actual machine code. instruction stepping, and hence is slower than @code{until} with an argument. -@item until @var{location} -@itemx u @var{location} -Continue running your program until either the specified @var{location} is -reached, or the current stack frame returns. The location is any of -the forms described in @ref{Specify Location}. +@item until @var{locspec} +@itemx u @var{locspec} +Continue running your program until either a location that matches @var{locspec} is +reached, or the current stack frame returns. @var{locspec} is any of +the forms described in @ref{Location Specifications}. This form of the command uses temporary breakpoints, and hence is quicker than @code{until} without an argument. The specified location is actually reached only if it is in the current frame. This @@ -6338,11 +6324,11 @@ invocations have returned. @end smallexample -@kindex advance @var{location} -@item advance @var{location} -Continue running the program up to the given @var{location}. An argument is -required, which should be of one of the forms described in -@ref{Specify Location}. +@kindex advance @var{locspec} +@item advance @var{locspec} +Continue running the program up to the location that matches +@var{locspec}. An argument is required, which should be of one of the +forms described in @ref{Location Specifications}. Execution will also stop upon exit from the current stack frame. This command is similar to @code{until}, but @code{advance} will not skip over recursive function calls, and the target location doesn't @@ -6442,7 +6428,7 @@ A more flexible solution is to execute @kbd{skip boring}. This instructs @code{foo}. Functions may be skipped by providing either a function name, linespec -(@pxref{Specify Location}), regular expression that matches the function's +(@pxref{Location Specifications}), regular expression that matches the function's name, file name or a @code{glob}-style pattern that matches the file name. On Posix systems the form of the regular expression is @@ -6479,7 +6465,7 @@ over when stepping. @itemx -fu @var{linespec} Functions named by @var{linespec} or the function containing the line named by @var{linespec} will be skipped over when stepping. -@xref{Specify Location}. +@xref{Location Specifications}. @item -rfunction @var{regexp} @itemx -rfu @var{regexp} @@ -6512,7 +6498,7 @@ will be skipped. @item skip function @r{[}@var{linespec}@r{]} After running this command, the function named by @var{linespec} or the function containing the line named by @var{linespec} will be skipped over when -stepping. @xref{Specify Location}. +stepping. @xref{Location Specifications}. If you do not specify @var{linespec}, the function you're currently debugging will be skipped. @@ -7141,11 +7127,10 @@ breakpoints on all threads, or on a particular thread. @cindex breakpoints and threads @cindex thread breakpoints @kindex break @dots{} thread @var{thread-id} -@item break @var{location} thread @var{thread-id} -@itemx break @var{location} thread @var{thread-id} if @dots{} -@var{location} specifies source lines; there are several ways of -writing them (@pxref{Specify Location}), but the effect is always to -specify some source line. +@item break @var{locspec} thread @var{thread-id} +@itemx break @var{locspec} thread @var{thread-id} if @dots{} +@var{locspec} specifies a location or locations in your program's +code. @xref{Location Specifications}, for details. Use the qualifier @samp{thread @var{thread-id}} with a breakpoint command to specify that you only want @value{GDBN} to stop the program when a @@ -8945,7 +8930,7 @@ prefer to use Emacs facilities to view source; see @ref{Emacs, ,Using @menu * List:: Printing source lines -* Specify Location:: How to specify code locations +* Location Specifications:: How to specify code locations * Edit:: Editing source files * Search:: Searching source files * Source Path:: Specifying source directories @@ -8961,7 +8946,7 @@ prefer to use Emacs facilities to view source; see @ref{Emacs, ,Using To print lines from a source file, use the @code{list} command (abbreviated @code{l}). By default, ten lines are printed. There are several ways to specify what part of the file you want to -print; see @ref{Specify Location}, for the full list. +print; see @ref{Location Specifications}, for the full list. Here are the forms of the @code{list} command most commonly used: @@ -9008,26 +8993,35 @@ than listing the same lines again. An exception is made for an argument of @samp{-}; that argument is preserved in repetition so that each repetition moves up in the source file. -In general, the @code{list} command expects you to supply zero, one or two -@dfn{locations}. Locations specify source lines; there are several ways -of writing them (@pxref{Specify Location}), but the effect is always -to specify some source line. +In general, the @code{list} command expects you to supply zero, one or +two location specs. These location specs are interpreted to specify +source code lines; there are several ways of writing them +(@pxref{Location Specifications}), but the effect is always to specify +some source lines to display. Here is a complete description of the possible arguments for @code{list}: @table @code -@item list @var{location} -Print lines centered around the line specified by @var{location}. +@item list @var{locspec} +Print lines centered around the line or lines that @var{locspec} +resolves to. @item list @var{first},@var{last} Print lines from @var{first} to @var{last}. Both arguments are -locations. When a @code{list} command has two locations, and the -source file of the second location is omitted, this refers to -the same source file as the first location. +location specs. When a @code{list} command has two location specs, and the source +file of the second location spec is omitted, this refers to the same source +file as the first location spec. If either @var{first} or @var{last} match +more than one source line in the program, then the list command will +show the list of ambiguous locations and does not print any source +lines. @item list ,@var{last} Print lines ending with @var{last}. +Likewise, if @var{last} matches more than one source line in the program, +then the list command will print the list of ambiguous locations +and does not print any source lines. + @item list @var{first}, Print lines starting with @var{first}. @@ -9041,17 +9035,47 @@ Print lines just before the lines last printed. As described in the preceding table. @end table -@node Specify Location -@section Specifying a Location +@node Location Specifications +@section Location Specifications @cindex specifying location -@cindex location +@cindex location spec +@cindex locspec @cindex source location Several @value{GDBN} commands accept arguments that specify a location -of your program's code. Since @value{GDBN} is a source-level -debugger, a location usually specifies some line in the source code. -Locations may be specified using three different formats: -linespec locations, explicit locations, or address locations. +or locations of your program's code. Since @value{GDBN} is a +source-level debugger, a location specification usually indicates some +line in the source code, but it can also indicate a function name, an +address, a label, and more. + +A @dfn{location specification} (a.k.a.@: location spec) serves as a +blueprint, and it may match more than one actual location in your +program. Examples of this situation are: + +@itemize @bullet +@item +The location spec specifies a function name, and multiple functions in +the program may have the same name. + +@item +The location spec specifies a file name, and multiple files in the +program share the same name. + +@item +For a C@t{++} constructor, the @value{NGCC} compiler generates several +instances of the function body, used in different cases. + +@item +For a C@t{++} template function, a given line in the function can +correspond to any number of instantiations. + +@item +For an inlined function, a given source line can correspond to several +places where that function is inlined. +@end itemize + +Locations may be specified using three different formats: linespec +locations, explicit locations, or address locations. @menu * Linespec Locations:: Linespec locations @@ -9270,12 +9294,17 @@ Alternatively, there are several ways to specify what part of the file you want to print if you want to see other parts of the program: @table @code -@item edit @var{location} -Edit the source file specified by @code{location}. Editing starts at -that @var{location}, e.g., at the specified source line of the -specified file. @xref{Specify Location}, for all the possible forms -of the @var{location} argument; here are the forms of the @code{edit} -command most commonly used: +@item edit @var{locspec} +Edit the source file specified by @code{locspec}. Editing starts at +the specified location, e.g., at the specified source line of the +specified file. @xref{Location Specifications}, for all the possible +forms of the @var{locspec} argument. + +If @code{locspec} matches more than one source line in your program, +then the command prints the list of source lines and does not proceed +with the editing. + +Here are the forms of the @code{edit} command most commonly used: @table @code @item edit @var{number} @@ -9655,11 +9684,11 @@ well as hex. @table @code @kindex info line @item info line -@itemx info line @var{location} +@itemx info line @var{locspec} Print the starting and ending addresses of the compiled code for -source line @var{location}. You can specify source lines in any of -the ways documented in @ref{Specify Location}. With no @var{location} -information about the current source line is printed. +source lines that match @var{locspec}. You can specify source lines in any of +the ways documented in @ref{Location Specifications}. With no +@var{locspec}, information about the current source line is printed. @end table For example, we can use @code{info line} to discover the location of @@ -9675,7 +9704,7 @@ Line 895 of "builtin.c" starts at pc 0x634c and \ @noindent @cindex code address and its source line We can also inquire (using @code{*@var{addr}} as the form for -@var{location}) what source line covers a particular address: +@var{locspec}) what source line covers a particular address: @smallexample (@value{GDBP}) info line *0x63ff Line 926 of "builtin.c" starts at pc 0x63e4 and \ @@ -9883,10 +9912,10 @@ Dump of assembler code from 0x400281 to 0x40028b: End of assembler dump. @end smallexample -Addresses cannot be specified as a location (@pxref{Specify Location}). -So, for example, if you want to disassemble function @code{bar} -in file @file{foo.c}, you must type @samp{disassemble 'foo.c'::bar} -and not @samp{disassemble foo.c:bar}. +Addresses cannot be specified as a location spec (@pxref{Location +Specifications}). So, for example, if you want to disassemble +function @code{bar} in file @file{foo.c}, you must type +@samp{disassemble 'foo.c'::bar} and not @samp{disassemble foo.c:bar}. Some architectures have more than one commonly-used set of instruction mnemonics or other syntax. @@ -14172,10 +14201,11 @@ argument processing and the beginning of @var{macro} for non C-like macros where the macro may begin with a hyphen. @kindex info macros -@item info macros @var{location} -Show all macro definitions that are in effect at the location specified -by @var{location}, and describe the source location or compiler -command-line where those definitions were established. +@item info macros @var{locspec} +Show all macro definitions that are in effect at the first location in +your program that matches @var{locspec}, and describe the source +location or compiler command-line where those definitions were +established. @kindex macro define @cindex user-defined macros @@ -14477,10 +14507,10 @@ conditions and actions. @table @code @cindex set tracepoint @kindex trace -@item trace @var{location} +@item trace @var{locspec} The @code{trace} command is very similar to the @code{break} command. -Its argument @var{location} can be any valid location. -@xref{Specify Location}. The @code{trace} command defines a tracepoint, +Its argument @var{locspec} can be any valid location specification. +@xref{Location Specifications}. The @code{trace} command defines a tracepoint, which is a point in the target program where the debugger will briefly stop, collect some data, and then allow the program to continue. Setting a tracepoint or changing its actions takes effect immediately if the remote stub @@ -14516,14 +14546,14 @@ Here are some examples of using the @code{trace} command: @noindent You can abbreviate @code{trace} as @code{tr}. -@item trace @var{location} if @var{cond} +@item trace @var{locspec} if @var{cond} Set a tracepoint with condition @var{cond}; evaluate the expression @var{cond} each time the tracepoint is reached, and collect data only if the value is nonzero---that is, if @var{cond} evaluates as true. @xref{Tracepoint Conditions, ,Tracepoint Conditions}, for more information on tracepoint conditions. -@item ftrace @var{location} [ if @var{cond} ] +@item ftrace @var{locspec} [ if @var{cond} ] @cindex set fast tracepoint @cindex fast tracepoints, setting @kindex ftrace @@ -14555,20 +14585,21 @@ sudo sysctl -w vm.mmap_min_addr=32768 which sets the low address to 32K, which leaves plenty of room for trampolines. The minimum address should be set to a page boundary. -@item strace @var{location} [ if @var{cond} ] +@item strace [@var{locspec} | -m @var{marker}] [ if @var{cond} ] @cindex set static tracepoint @cindex static tracepoints, setting @cindex probe static tracepoint marker @kindex strace The @code{strace} command sets a static tracepoint. For targets that support it, setting a static tracepoint probes a static -instrumentation point, or marker, found at @var{location}. It may not -be possible to set a static tracepoint at the desired location, in -which case the command will exit with an explanatory message. +instrumentation point, or marker, found at the locations that match +@var{locspec}. It may not be possible to set a static tracepoint at +the desired location, in which case the command will exit with an +explanatory message. @value{GDBN} handles arguments to @code{strace} exactly as for @code{trace}, with the addition that the user can also specify -@code{-m @var{marker}} as @var{location}. This probes the marker +@code{-m @var{marker}} instead of a location spec. This probes the marker identified by the @var{marker} string identifier. This identifier depends on the static tracepoint backend library your program is using. You can find all the marker identifiers in the @samp{ID} field @@ -17439,9 +17470,9 @@ peculiarities and holes to be aware of. @itemize @bullet @item -Linespecs (@pxref{Specify Location}) are never relative to the current -crate. Instead, they act as if there were a global namespace of -crates, somewhat similar to the way @code{extern crate} behaves. +Linespecs (@pxref{Location Specifications}) are never relative to the +current crate. Instead, they act as if there were a global namespace +of crates, somewhat similar to the way @code{extern crate} behaves. That is, if @value{GDBN} is stopped at a breakpoint in a function in crate @samp{A}, module @samp{B}, then @code{break B::f} will attempt @@ -18762,15 +18793,14 @@ information. Flags @code{-c} and @code{-s} cannot be used together. -@item break @var{location} task @var{taskno} -@itemx break @var{location} task @var{taskno} if @dots{} +@item break @var{locspec} task @var{taskno} +@itemx break @var{locspec} task @var{taskno} if @dots{} @cindex breakpoints and tasks, in Ada @cindex task breakpoints, in Ada @kindex break @dots{} task @var{taskno}@r{ (Ada)} These commands are like the @code{break @dots{} thread @dots{}} -command (@pxref{Thread Stops}). The -@var{location} argument specifies source lines, as described -in @ref{Specify Location}. +command (@pxref{Thread Stops}). @xref{Location Specifications}, for +the various forms of @var{locspec}. Use the qualifier @samp{task @var{taskno}} with a breakpoint command to specify that you only want @value{GDBN} to stop the program when a @@ -19531,12 +19561,13 @@ These commands can be used to enable or disable type printers. @kindex info scope @cindex local variables -@item info scope @var{location} +@item info scope @var{locspec} List all the variables local to a particular scope. This command -accepts a @var{location} argument---a function name, a source line, or -an address preceded by a @samp{*}, and prints all the variables local -to the scope defined by that location. (@xref{Specify Location}, for -details about supported forms of @var{location}.) For example: +accepts a location specification argument---a function name, a source +line, or an address preceded by a @samp{*}, and prints all the +variables local to the scope defined by the first location in your +program that matches @var{locspec}. (@xref{Location Specifications}, +for details about supported forms of @var{locspec}.) For example: @smallexample (@value{GDBP}) @b{info scope command_line_handler} @@ -20124,23 +20155,26 @@ an address of your own choosing, with the following commands: @table @code @kindex jump @kindex j @r{(@code{jump})} -@item jump @var{location} -@itemx j @var{location} -Resume execution at @var{location}. Execution stops again immediately -if there is a breakpoint there. @xref{Specify Location}, for a description -of the different forms of @var{location}. It is common -practice to use the @code{tbreak} command in conjunction with -@code{jump}. @xref{Set Breaks, ,Setting Breakpoints}. +@item jump @var{locspec} +@itemx j @var{locspec} +Resume execution at the address @var{locspec} resolves to. +@xref{Location Specifications}, for a description of the different +forms of @var{locspec}. If @var{locspec} resolves to more than one +address, the command aborts before jumping. +Execution stops again immediately if there is a breakpoint there. It +is common practice to use the @code{tbreak} command in conjunction +with @code{jump}. @xref{Set Breaks, ,Setting Breakpoints}. The @code{jump} command does not change the current stack frame, or the stack pointer, or the contents of any memory location or any -register other than the program counter. If @var{location} is in -a different function from the one currently executing, the results may -be bizarre if the two functions expect different patterns of arguments or -of local variables. For this reason, the @code{jump} command requests -confirmation if the specified line is not in the function currently -executing. However, even bizarre results are predictable if you are -well acquainted with the machine-language code of your program. +register other than the program counter. If @var{locspec} resolves to +an address in a different function from the one currently executing, the +results may be bizarre if the two functions expect different patterns +of arguments or of local variables. For this reason, the @code{jump} +command requests confirmation if the specified line is not in the +function currently executing. However, even bizarre results are +predictable if you are well acquainted with the machine-language code +of your program. @end table On many systems, you can get much the same effect as the @code{jump} @@ -25365,15 +25399,18 @@ use the @code{break-range} command. @table @code @kindex break-range -@item break-range @var{start-location}, @var{end-location} +@item break-range @var{start-locspec}, @var{end-locspec} Set a breakpoint for an address range given by -@var{start-location} and @var{end-location}, which can specify a function name, +@var{start-locspec} and @var{end-locspec}, which can specify a function name, a line number, an offset of lines from the current line or from the start -location, or an address of an instruction (see @ref{Specify Location}, -for a list of all the possible ways to specify a @var{location}.) +location, or an address of an instruction (see @ref{Location Specifications}, +for a list of all the possible ways to specify a location spec). +If either @var{start-locspec} or @var{end-locspec} resolves to multiple +addresses in the program, then the command aborts with an error +without creating a breakpoint. The breakpoint will stop execution of the inferior whenever it executes an instruction at any address within the specified range, -(including @var{start-location} and @var{end-location}.) +(including @var{start-locspec} and @var{end-locspec}.) @kindex set powerpc @item set powerpc soft-float @@ -31192,11 +31229,11 @@ N.A. @smallexample -break-insert [ -t ] [ -h ] [ -f ] [ -d ] [ -a ] [ --qualified ] [ -c @var{condition} ] [ --force-condition ] [ -i @var{ignore-count} ] - [ -p @var{thread-id} ] [ @var{location} ] + [ -p @var{thread-id} ] [ @var{locspec} ] @end smallexample @noindent -If specified, @var{location}, can be one of: +If specified, @var{locspec}, can be one of: @table @var @item linespec location @@ -31235,10 +31272,10 @@ Insert a temporary breakpoint. @item -h Insert a hardware breakpoint. @item -f -If @var{location} cannot be parsed (for example if it +If @var{locspec} cannot be parsed (for example if it refers to unknown files or functions), create a pending breakpoint. Without this flag, @value{GDBN} will report -an error, and won't create a breakpoint, if @var{location} +an error, and won't create a breakpoint, if @var{locspec} cannot be parsed. @item -d Create a disabled breakpoint. @@ -31320,12 +31357,12 @@ times="0"@}]@} @smallexample -dprintf-insert [ -t ] [ -f ] [ -d ] [ --qualified ] [ -c @var{condition} ] [--force-condition] [ -i @var{ignore-count} ] - [ -p @var{thread-id} ] [ @var{location} ] [ @var{format} ] + [ -p @var{thread-id} ] [ @var{locspec} ] [ @var{format} ] [ @var{argument} ] @end smallexample @noindent -If supplied, @var{location} and @code{--qualified} may be specified +If supplied, @var{locspec} and @code{--qualified} may be specified the same way as for the @code{-break-insert} command. @xref{-break-insert}. @@ -31335,10 +31372,10 @@ The possible optional parameters of this command are: @item -t Insert a temporary breakpoint. @item -f -If @var{location} cannot be parsed (for example, if it +If @var{locspec} cannot be parsed (for example, if it refers to unknown files or functions), create a pending breakpoint. Without this flag, @value{GDBN} will report -an error, and won't create a breakpoint, if @var{location} +an error, and won't create a breakpoint, if @var{locspec} cannot be parsed. @item -d Create a disabled breakpoint. @@ -32551,12 +32588,12 @@ fullname="/home/foo/bar/try.c",line="13",arch="i386:x86_64"@} @subsubheading Synopsis @smallexample - -exec-jump @var{location} + -exec-jump @var{locspec} @end smallexample Resumes execution of the inferior program at the location specified by -parameter. @xref{Specify Location}, for a description of the -different forms of @var{location}. +the parameter. @xref{Location Specifications}, for a description of +the different forms of @var{locspec}. @subsubheading @value{GDBN} Command @@ -32870,13 +32907,13 @@ fullname="/home/foo/bar/try.c",line="10",arch="i386:x86_64"@} @subsubheading Synopsis @smallexample - -exec-until [ @var{location} ] + -exec-until [ @var{locspec} ] @end smallexample -Executes the inferior until the @var{location} specified in the -argument is reached. If there is no argument, the inferior executes -until a source line greater than the current one is reached. The -reason for stopping in this case will be @samp{location-reached}. +Executes the inferior until a location that matches @var{locspec} is +reached. If there is no argument, the inferior executes until a +source line greater than the current one is reached. The reason for +stopping in this case will be @samp{location-reached}. @subsubheading @value{GDBN} Command @@ -34935,7 +34972,7 @@ next trace frame that corresponds to a tracepoint at an address outside the specified range. Both bounds are considered to be inside the range. @item line -Line specification is required as parameter. @xref{Specify Location}. +Location specification is required as parameter. @xref{Location Specifications}. Finds next trace frame that corresponds to a tracepoint at the specified location. @@ -39438,8 +39475,8 @@ messages, see @ref{Debugging Output}.) @table @code @kindex maint agent @kindex maint agent-eval -@item maint agent @r{[}-at @var{location}@r{,}@r{]} @var{expression} -@itemx maint agent-eval @r{[}-at @var{location}@r{,}@r{]} @var{expression} +@item maint agent @r{[}-at @var{linespec}@r{,}@r{]} @var{expression} +@itemx maint agent-eval @r{[}-at @var{linespec}@r{,}@r{]} @var{expression} Translate the given @var{expression} into remote agent bytecodes. This command is useful for debugging the Agent Expression mechanism (@pxref{Agent Expressions}). The @samp{agent} version produces an @@ -39450,7 +39487,8 @@ globb} will include bytecodes to record four bytes of memory at each of the addresses of @code{globa} and @code{globb}, while discarding the result of the addition, while an evaluation expression will do the addition and return the sum. -If @code{-at} is given, generate remote agent bytecode for @var{location}. +If @code{-at} is given, generate remote agent bytecode for all +locations that match @var{linespec} (@pxref{Linespec Locations}). If not, generate remote agent bytecode for current frame PC address. @kindex maint agent-printf diff --git a/gdb/doc/guile.texi b/gdb/doc/guile.texi index 3c517230929..63916eed181 100644 --- a/gdb/doc/guile.texi +++ b/gdb/doc/guile.texi @@ -1965,7 +1965,7 @@ This constant means that filename completion should be performed. @item COMPLETE_LOCATION This constant means that location completion should be done. -@xref{Specify Location}. +@xref{Location Specifications}. @item COMPLETE_COMMAND This constant means that completion should examine @value{GDBN} diff --git a/gdb/doc/python.texi b/gdb/doc/python.texi index cb5283e03c0..f933c7d30c9 100644 --- a/gdb/doc/python.texi +++ b/gdb/doc/python.texi @@ -577,7 +577,8 @@ either @code{None} or another tuple that contains all the locations that match the expression represented as @code{gdb.Symtab_and_line} objects (@pxref{Symbol Tables In Python}). If @var{expression} is provided, it is decoded the way that @value{GDBN}'s inbuilt -@code{break} or @code{edit} commands do (@pxref{Specify Location}). +@code{break} or @code{edit} commands do (@pxref{Location +Specifications}). @end defun @defun gdb.prompt_hook (current_prompt) @@ -4186,7 +4187,7 @@ This constant means that filename completion should be performed. @vindex COMPLETE_LOCATION @item gdb.COMPLETE_LOCATION This constant means that location completion should be done. -@xref{Specify Location}. +@xref{Location Specifications}. @vindex COMPLETE_COMMAND @item gdb.COMPLETE_COMMAND base-commit: fbcda577011d73fdcf1ebf86160b6fc8ddd95299 -- 2.36.0