6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2024-11-01 15:11:24 +00:00
Code Issues Projects Releases Wiki Activity

[RuntimeDyld] Always allocate at least 1 byte for object sections in the JIT to

Browse Source 
ensure that section addresses are distinct.

mapSectionAddress will fail if two sections are allocated the same address,
which can happen if any section has zero size (since malloc(0) is implementation
defined). Unfortunately I've been unable to repro this with a simple test case.

Fixes <rdar://problem/20314015>.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@234299 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Lang Hames 2015-04-07 06:27:56 +00:00
parent d27a0a9b2c
commit 78906c6555
1 changed files with 16 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

29
lib/ExecutionEngine/RuntimeDyld/RuntimeDyld.cpp
View File

@ -361,19 +361,20 @@ void RuntimeDyldImpl::computeTotalAllocSize(const ObjectFile &Obj,
if (Name == ".eh_frame")
SectionSize += 4;
if (SectionSize > 0) {
// save the total size of the section
if (IsCode) {
CodeSectionSizes.push_back(SectionSize);
} else if (IsReadOnly) {
ROSectionSizes.push_back(SectionSize);
} else {
RWSectionSizes.push_back(SectionSize);
}
// update the max alignment
if (Alignment > MaxAlignment) {
MaxAlignment = Alignment;
}
if (!SectionSize)
SectionSize = 1;
if (IsCode) {
CodeSectionSizes.push_back(SectionSize);
} else if (IsReadOnly) {
ROSectionSizes.push_back(SectionSize);
} else {
RWSectionSizes.push_back(SectionSize);
}
// update the max alignment
if (Alignment > MaxAlignment) {
MaxAlignment = Alignment;
}
}
}
@ -578,6 +579,8 @@ unsigned RuntimeDyldImpl::emitSection(const ObjectFile &Obj,
if (IsRequired) {
Check(Section.getContents(data));
Allocate = DataSize + PaddingSize + StubBufSize;
if (!Allocate)
Allocate = 1;
Addr = IsCode ? MemMgr.allocateCodeSection(Allocate, Alignment, SectionID,
Name)
: MemMgr.allocateDataSection(Allocate, Alignment, SectionID,