mirror of
https://github.com/Zenithsiz/ftmemsim-valgrind.git
synced 2026-02-03 10:05:29 +00:00
5e41080720
This is a supplement to commit 86277041 To improve its results, Callgrind does special handling for the runtime linker entry point to resolve symbols. However, it only used the exact symbol name "_dl_runtime_resolve", as well as specific machine code templates (when the runtime linker was stripped from symbol names) as basis. Recent glibc added multiple similar symbol names as variants, such as _dl_runtime_resolve_xsave. The above-mentioned commit 86277041 solves this by extending the check for machine code templates for specific Linux distributions. This patch extends this for more architectures and variants by checking if a function starts with "_dl_runtime_resolve". Furthermore, the original function names of the variants still are visible in the output (and not forced to the prefix). While the heuristic that every function symbol starting with the prefix "_dl_runtime_resolve" as being an entry point into the runtime linker for resolving a function address may be a bit rough, this prefix is not expected to be used often in other source code for anything else. The worst case is a slightly misleading call graph only visible in a very specific situation: if the wrongly-detected function does a tail call (ie instead of returning, jumping to another function), it will be shown as 2 calls in a row from the original caller.
Release notes for Valgrind
~~~~~~~~~~~~~~~~~~~~~~~~~~
If you are building a binary package of Valgrind for distribution,
please read README_PACKAGERS. It contains some important information.
If you are developing Valgrind, please read README_DEVELOPERS. It contains
some useful information.
For instructions on how to build/install, see the end of this file.
If you have problems, consult the FAQ to see if there are workarounds.
Executive Summary
~~~~~~~~~~~~~~~~~
Valgrind is a framework for building dynamic analysis tools. There are
Valgrind tools that can automatically detect many memory management
and threading bugs, and profile your programs in detail. You can also
use Valgrind to build new tools.
The Valgrind distribution currently includes six production-quality
tools: a memory error detector, two thread error detectors, a cache
and branch-prediction profiler, a call-graph generating cache and
branch-prediction profiler, and a heap profiler. It also includes
three experimental tools: a heap/stack/global array overrun detector,
a different kind of heap profiler, and a SimPoint basic block vector
generator.
Valgrind is closely tied to details of the CPU, operating system and to
a lesser extent, compiler and basic C libraries. This makes it difficult
to make it portable. Nonetheless, it is available for the following
platforms:
- X86/Linux
- AMD64/Linux
- PPC32/Linux
- PPC64/Linux
- ARM/Linux
- ARM64/Linux
- x86/macOS
- AMD64/macOS
- S390X/Linux
- MIPS32/Linux
- MIPS64/Linux
- nanoMIPS/Linux
- X86/Solaris
- AMD64/Solaris
Note that AMD64 is just another name for x86_64, and Valgrind runs fine
on Intel processors. Also note that the core of macOS is called
"Darwin" and this name is used sometimes.
Valgrind is licensed under the GNU General Public License, version 2.
Read the file COPYING in the source distribution for details.
However: if you contribute code, you need to make it available as GPL
version 2 or later, and not 2-only.
Documentation
~~~~~~~~~~~~~
A comprehensive user guide is supplied. Point your browser at
$PREFIX/share/doc/valgrind/manual.html, where $PREFIX is whatever you
specified with --prefix= when building.
Building and installing it
~~~~~~~~~~~~~~~~~~~~~~~~~~
To install from the GIT repository:
0. Clone the code from GIT:
git clone git://sourceware.org/git/valgrind.git
There are further instructions at
http://www.valgrind.org/downloads/repository.html.
1. cd into the source directory.
2. Run ./autogen.sh to setup the environment (you need the standard
autoconf tools to do so).
3. Continue with the following instructions...
To install from a tar.bz2 distribution:
4. Run ./configure, with some options if you wish. The only interesting
one is the usual --prefix=/where/you/want/it/installed.
5. Run "make".
6. Run "make install", possibly as root if the destination permissions
require that.
7. See if it works. Try "valgrind ls -l". Either this works, or it
bombs out with some complaint. In that case, please let us know
(see http://valgrind.org/support/bug_reports.html).
Important! Do not move the valgrind installation into a place
different from that specified by --prefix at build time. This will
cause things to break in subtle ways, mostly when Valgrind handles
fork/exec calls.
The Valgrind Developers