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Align the data section correctly when loading an ELF file.

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Patch by Amara Emerson.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166920 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Tim Northover 2012-10-29 10:47:07 +00:00
parent f00677d74f
commit b210e6fea5
2 changed files with 26 additions and 3 deletions
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15
test/ExecutionEngine/MCJIT/test-data-align.ll Normal file
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@ -0,0 +1,15 @@
; RUN: %lli -mtriple=%mcjit_triple -use-mcjit -O0 %s
; Check that a variable is always aligned as specified.
@var = global i32 0, align 32
define i32 @main() {
%addr = ptrtoint i32* @var to i64
%mask = and i64 %addr, 31
%tst = icmp eq i64 %mask, 0
br i1 %tst, label %good, label %bad
good:
ret i32 0
bad:
ret i32 1
}

14
tools/lli/lli.cpp
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@ -42,6 +42,7 @@
#include "llvm/Support/Debug.h"
#include "llvm/Support/DynamicLibrary.h"
#include "llvm/Support/Memory.h"
#include "llvm/Support/MathExtras.h"
#include <cerrno>
#ifdef __linux__
@ -303,9 +304,16 @@ uint8_t *LLIMCJITMemoryManager::allocateDataSection(uintptr_t Size,
unsigned SectionID) {
if (!Alignment)
Alignment = 16;
uint8_t *Addr = (uint8_t*)calloc((Size + Alignment - 1)/Alignment, Alignment);
AllocatedDataMem.push_back(sys::MemoryBlock(Addr, Size));
return Addr;
// Ensure that enough memory is requested to allow aligning.
size_t NumElementsAligned = 1 + (Size + Alignment - 1)/Alignment;
uint8_t *Addr = (uint8_t*)calloc(NumElementsAligned, Alignment);
// Honour the alignment requirement.
uint8_t *AlignedAddr = (uint8_t*)RoundUpToAlignment((uint64_t)Addr, Alignment);
// Store the original address from calloc so we can free it later.
AllocatedDataMem.push_back(sys::MemoryBlock(Addr, NumElementsAligned*Alignment));
return AlignedAddr;
}
uint8_t *LLIMCJITMemoryManager::allocateCodeSection(uintptr_t Size,