Displaying 7 results from an estimated 7 matches for "emitsymbolvalue".
2016 Aug 05
2
XRay: Demo on x86_64/Linux almost done; some questions.
..._map", ELF::SHT_PROGBITS,
ELF::SHF_ALLOC | ELF::SHF_GROUP | ELF::SHF_MERGE, 0,
CurrentFnSym->getName());
auto PrevSection = OutStreamer->getCurrentSectionOnly();
OutStreamer->SwitchSection(Section);
for (const auto &Sled : Sleds) {
OutStreamer->EmitSymbolValue(Sled.Sled, 8);
OutStreamer->EmitSymbolValue(CurrentFnSym, 8);
auto Kind = static_cast<uint8_t>(Sled.Kind);
OutStreamer->EmitBytes(
StringRef(reinterpret_cast<const char *>(&Kind), 1));
OutStreamer->EmitBytes(
StringRef(reinterpret...
2017 Jan 20
4
16-bit bytes for AsmPrinter/DWARF
...implementation of the DWARF debugging format is not very good at distinguishing between target-sized bytes (which is the more common use) and 8-bit-bytes. The DWARF standard itself seems not very good in this regard, actually. So we have had to hack our way around this. I.e., at some call-sites of EmitSymbolValue(), EmitLabelDifference(), EmitIntValue() and EmitLabelReference(), an 8-bit-byte-sized argument has had to be converted to target-byte-size (which is extra hacky for odd numbers of eight-bit-bytes).
We've been thinking about what a good upstream fix would look like, and believe that perhaps co...
2017 Nov 28
3
storing MBB MCSymbol in custom section
...ed my own custom section to be added at the end into a
binary upon compilation which contains address of all basic blocks. As
the final address of the basic block is not known until link time, I
collect the MCSymbol* Symbol Values per BB in a temp array and at the
in the custom section and emit it (emitSymbolValue) into my section
within EmitEndOfAsmFile()
I have found people looking at slightly different uses of the basic
block address but running into the same problem as me when compiling.
$clang calc_pi.c -o calc_pi
fatal error: error in backend: Undefined temporary symbol
However when only compiling (i...
2016 Aug 04
2
XRay: Demo on x86_64/Linux almost done; some questions.
> On 4 Aug 2016, at 06:27, Serge Rogatch <serge.rogatch at gmail.com> wrote:
>
> Hi Dean,
>
> I have a question about the following piece of code in compiler-rt/trunk/lib/xray/xray_trampoline_x86.S :
> movq _ZN6__xray19XRayPatchedFunctionE(%rip), %rax
> testq %rax, %rax
> je .Ltmp0
>
> // assume that %r10d has the function id.
> movl %r10d,
2016 Aug 08
2
XRay: Demo on x86_64/Linux almost done; some questions.
...LOC | ELF::SHF_GROUP | ELF::SHF_MERGE, 0,
> > CurrentFnSym->getName());
> > auto PrevSection = OutStreamer->getCurrentSectionOnly();
> > OutStreamer->SwitchSection(Section);
> > for (const auto &Sled : Sleds) {
> > OutStreamer->EmitSymbolValue(Sled.Sled, 8);
> > OutStreamer->EmitSymbolValue(CurrentFnSym, 8);
> > auto Kind = static_cast<uint8_t>(Sled.Kind);
> > OutStreamer->EmitBytes(
> > StringRef(reinterpret_cast<const char *>(&Kind), 1));
> > OutStrea...
2011 Mar 10
3
[LLVMdev] Detrimental optimization for reducing relocations.
...contains this code:
--------------------------------------------------------------------------------
// If the section in question will end up with an address of 0 anyway, we can
// just emit an absolute reference to save a relocation.
if (Section.isBaseAddressKnownZero()) {
OutStreamer.EmitSymbolValue(Label, 4, 0/*AddrSpace*/);
return;
}
// Otherwise, emit it as a label difference from the start of the section.
EmitLabelDifference(Label, SectionLabel, 4);
}
--------------------------------------------------------------------------------
isBaseAddrfessKnownZero() only returns true for...
2018 Jul 16
2
Collect all possible return address and write in a new section
Hi
I try to implement a coarse-grained CFI in LLVM
(CFI = Contorl Flow Integrity)
I want to collect all address after call instructions
address after a call equals to a valid return site in coarse-grained CFI
I want to add a new section
and write all the possible return address in the new section
(and then, add the integrity check)
I have some quetions:
(1)
Which part of LLVM code should