similar to: [LLVMdev] Changing pointer representation?

I was just wondering what existing work has been done on proving programs type-safe using the LLVM framework? I've read the paper on memory-safety for embedded systems, but that's not quite what I'm looking for, as my application (which involves running untrusted code within a trusted context) might fail if a pointer to one object became a pointer to another of the same type. Looking

Hi all, I am experiencing a problem with the representation of addresses in the x86_64 TableGen backend and was hoping someone can tell me if it is fixable. Any comments or hints in to send me in the right direction would be greatly appreciated. I am using LLVM version 3.8, commit 251286. I have an IR pass that stores metadata in the upper 32 bits of 64-bit pointers in order to implement

On Sun, 3 Sep 2006, Tanya M. Lattner wrote: >> BTW, how can I run all tests only on LLC to reduce the amount of time to >> wait until tests are finished, if it's possible? > > In my previous reply to your question, I suggested you look at > TEST.llc.Makefile and TEST.llc.report in the test directory. Modifying > those makefile/report files to use your register allocator

Jules, The link Chris forwarded (safecode.cs.uiuc.edu) describes the most relevant work so far. But that work aims to make ordinary C and C++ programs memory-safe, without using garbage collection or any other automatic memory management scheme, i.e., allowing dangling pointers but ensuring they are harmless. It also allows any casts that are legal in C. If you want to enforce strict

Hi, Here is the code in IndVarSimplify.cpp. SmallVector<WeakVH, 16> DeadInsts; while (!DeadInsts.empty()) if (Instruction *Inst = dyn_cast_or_null<Instruction>(&*DeadInsts.pop_back_val())) RecursivelyDeleteTriviallyDeadInstructions(Inst, TLI); Since DeadInsts.pop_back_val() is WeakVH which could hold a NULL pointer, the expression,

Hi Eli, Thanks, I’ll look into that then! Cheers, Taddeüs From: Friedman, Eli Sent: Wednesday, 2 August 2017 19:48 To: Taddeus; llvm-dev at lists.llvm.org Subject: Re: [llvm-dev] Efficiently ignoring upper 32 pointer bits whendereferencing On 8/2/2017 9:03 AM, Taddeus via llvm-dev wrote: > Hi all, > > I am experiencing a problem with the representation of addresses in > the x86_64

Dear Manish, First, in answer to your original question: yes, there is a pass that will convert constant expression GEPs used within LLVM instructions into GEP instructions. SAFECode has a pass called BreakConstantGEPs in safecode/trunk/lib/ArrayBoundChecks/BreakConstantGEPs.cpp (http://llvm.org/viewvc/llvm-project/safecode/trunk/lib/ArrayBoundChecks/BreakConstantGEPs.cpp?view=log). It

Check for the return value of ''open_ctree()'' before dereferencing it. Signed-off-by: Nageswara R Sastry <nasastry@in.ibm.com> --- btrfs-image.c | 1 + 1 file changed, 1 insertion(+) diff --git a/btrfs-image.c b/btrfs-image.c index f2bbcc8..2a33a55 100644 --- a/btrfs-image.c +++ b/btrfs-image.c @@ -491,6 +491,7 @@ static int create_metadump(const char *input, FILE *out,

sorry for top-posting, the two topics started with 2 different reason subject, but then we finished on the same problem. btw,the 2 show channel are reported above: the channel with DTMF working kcenter*CLI> core show channel SIP/pbx2-000004b9 -- General -- Name: SIP/pbx2-000004b9 Type: SIP UniqueID: 1467323106.1275 Caller ID: xxxx Caller ID Name: xxxx

On Thu, Nov 7, 2013 at 11:02 AM, Yin Ma <yinma at codeaurora.org> wrote: > Hi John, > > > > It seems the dereferencing a NULL pointer is undefined behavior but > > Calling a function through a null pointer seems o.k. > What is the well defined behavior of calling a null function pointer? > > > If so , for this place, we need comment out the check. >

I am having trouble getting asterisk-addons 1.4.2 to compile (after a successful configure). Asterisk itself (and AsteriskGUI) compile fine. I get: cdr_addon_mysql.c: In function `handle_cdr_mysql_status': cdr_addon_mysql.c:91: error: dereferencing pointer to incomplete type cdr_addon_mysql.c:93: error: dereferencing pointer to incomplete type cdr_addon_mysql.c:95: error: dereferencing

On 16 Mar 2015, at 08:25, Sanjoy Das <sanjoy at playingwithpointers.com> wrote: > > The LangRef says this about addrspacecast: "Note that if the address > space conversion is legal then both result and operand refer to the > same memory location.". This brings forth two related questions: > > 1. what happens if you execute an "invalid" addrspacecast?

On Aug 25, 2009, at 8:59 AM, John Regehr wrote: >> Function pointers are where things get fun. To do these, we need to >> determine at run time whether we need to call the ISR or the mainline >> version of a function > > This sounds convenient but it may well be overkill. > > On a PIC-class platform we can probably consider it to be a design > flaw if > the

Hi John, It seems the dereferencing a NULL pointer is undefined behavior but Calling a function through a null pointer seems o.k. If so , for this place, we need comment out the check. http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#232 look at Notes from the October 2003 meeting. Yin From: John Criswell [mailto:criswell at illinois.edu] Sent: Wednesday,

Hi Duncan, Why to break? I wish to analyse all the operands of getelemetptr instructions. For which I iterate over the code and get the instruction of interest by getopcode == getelementptr. But the getelementptrs in this form as in my last mail are getting away from my pass. So i wish to break it. I have a work around if breaking is not possible, but I think it may be a common requirement by

Hi: I'm trying to join a samba 4.3.4 (as an additional domain controller) to a domain with Zentyal 4.3 (That has samba 4.3.4 inside). I know that this is an old samba version but I cann't upgrade zentyal first. So, When I can join the samba 4.3.4 to the domain I will demote the Zentyal. But when I try: samba-tool domain join dtcf.etecsa.cu DC -U "DTCF\administrator"

Depending on the value of dsa_pass_to_use, either EquivBUDataStructures or EQTDDataStructures is used. In the case that the top-down DSA is used, information is pushed down to nodes in callees. However, if bottom-up DSA is used, information has only been merged upwards and the nodes are not necessarily equivalent. Harmen Andrew Lenharth wrote: > On Tue, Mar 16, 2010 at 3:46 PM, Patrick

> Function pointers are where things get fun. To do these, we need to > determine at run time whether we need to call the ISR or the mainline > version of a function This sounds convenient but it may well be overkill. On a PIC-class platform we can probably consider it to be a design flaw if the programmer doesn't know whether a function pointer will be dereferenced from interrupt

Devang Patel wrote: > On Jul 25, 2008, at 12:58 PM, Marc de Kruijf wrote: > > I'd like to write a pass that does both: implements a code transformation and saves information that can be accessed by subsequent passes. > > Ideally, we want to use two separate pass. However, it is quiet possible that your requirement is unique. Would it be possible to provide more info. on what

https://bugzilla.mindrot.org/show_bug.cgi?id=3192 Bug ID: 3192 Summary: openssh-8.2 & openssl-1.1.1d error: dereferencing pointer to incomplete type Not found struct BIO , bio->num_write Product: Portable OpenSSH Version: 8.2p1 Hardware: Other OS: Linux Status: NEW