http://llvm.org/bugs/show_bug.cgi?id=3512
Summary: segfault with dynamic alloca+call combination
Product: new-bugs
Version: unspecified
Platform: PC
OS/Version: Linux
Status: NEW
Keywords: regression
Severity: normal
Priority: P2
Component: new bugs
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
To reproduce:
$ llc bar.bc
on a x86-32 linux machine with llvm release_25 branch rev 63833
-
The the attached bitcode is from a simple reduced testcase written in D:
private import tango.stdc.stdlib : alloca;
ubyte[] binaryDigest(ubyte[] buffer) { return null; }
void hexDigest (char[] buffer, uint ds) {
ubyte[] buf = (cast(ubyte *) alloca(ds))[0..ds];
ubyte[] ret = binaryDigest(buf);
}
the attached bitcode was generated by LDC.
This code works with LLVM 2.4, but with LLVM 2.5 it segfaults inside LLVM
codegen:
..
Program received signal SIGSEGV, Segmentation fault.
..
#0 llvm::X86RegisterInfo::eliminateCallFramePseudoInstr (this=0xa617f58,
m...@0xa656000, m...@0xa6570f0, I=
{<bidirectional_iterator<llvm::MachineInstr, int>> =
{<std::iterator<std::bidirectional_iterator_tag, llvm::MachineInstr, int,
llvm::MachineInstr*, llvm::MachineInstr&>> = {<No data fields>}, <No data
fields>}, NodePtr = 0xa6574f8}) at
/usr/lib/gcc/i686-pc-linux-gnu/4.3.3/../../../../include/c++/4.3.3/bits/stl_vector.h:485
#1 0x08564b97 in calculateCalleeSavedRegisters (this=0xa64db60, f...@0xa656000)
at PrologEpilogInserter.cpp:173
#2 0x0856636e in runOnMachineFunction (this=0xa64db60, f...@0xa656000) at
PrologEpilogInserter.cpp:70
#3 0x08864a51 in llvm::FPPassManager::runOnFunction (this=0xa63f0e0,
f...@0xa621ed8) at PassManager.cpp:1323
#4 0x08864e27 in llvm::FunctionPassManagerImpl::run (this=0xa63e8b8,
f...@0xa621ed8) at PassManager.cpp:1281
#5 0x08864fd5 in llvm::FunctionPassManager::run (this=0xbfc194a0,
f...@0xa621ed8) at PassManager.cpp:1226
#6 0x081fa409 in write_asm_to_file (targ...@0xa617e58, m...@0xa616e48,
o...@0xbfc198a8)
at /home/tomas/ldc/gen/toobj.cpp:312
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