Implement GDB integration for source level debugging of code JITed using
the MCJIT execution engine.
The GDB JIT debugging integration support works by registering a loaded
object image with a pre-defined function that GDB will monitor if GDB
is attached. GDB integration support is implemented for ELF only at this
time. This integration requires GDB version 7.0 or newer.
Patch by Andy Kaylor!
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@154868 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/ExecutionEngine/RuntimeDyld/RuntimeDyld.cpp b/lib/ExecutionEngine/RuntimeDyld/RuntimeDyld.cpp
index 63cec1a..1b1840a 100644
--- a/lib/ExecutionEngine/RuntimeDyld/RuntimeDyld.cpp
+++ b/lib/ExecutionEngine/RuntimeDyld/RuntimeDyld.cpp
@@ -59,11 +59,17 @@
llvm_unreachable("Attempting to remap address of unknown section!");
}
+// Subclasses can implement this method to create specialized image instances
+// The caller owns the the pointer that is returned.
+ObjectImage *RuntimeDyldImpl::createObjectImage(const MemoryBuffer *InputBuffer) {
+ ObjectFile *ObjFile = ObjectFile::createObjectFile(const_cast<MemoryBuffer*>
+ (InputBuffer));
+ ObjectImage *Obj = new ObjectImage(ObjFile);
+ return Obj;
+}
+
bool RuntimeDyldImpl::loadObject(const MemoryBuffer *InputBuffer) {
- // FIXME: ObjectFile don't modify MemoryBuffer.
- // It should use const MemoryBuffer as parameter.
- OwningPtr<ObjectFile> obj(ObjectFile::createObjectFile(
- const_cast<MemoryBuffer*>(InputBuffer)));
+ OwningPtr<ObjectImage> obj(createObjectImage(InputBuffer));
if (!obj)
report_fatal_error("Unable to create object image from memory buffer!");
@@ -110,7 +116,8 @@
(uintptr_t)FileOffset;
uintptr_t SectOffset = (uintptr_t)(SymPtr - (const uint8_t*)sData.begin());
unsigned SectionID =
- findOrEmitSection(*si,
+ findOrEmitSection(*obj,
+ *si,
SymType == object::SymbolRef::ST_Function,
LocalSections);
bool isGlobal = flags & SymbolRef::SF_Global;
@@ -128,7 +135,7 @@
// Allocate common symbols
if (CommonSize != 0)
- emitCommonSymbols(CommonSymbols, CommonSize, LocalSymbols);
+ emitCommonSymbols(*obj, CommonSymbols, CommonSize, LocalSymbols);
// Parse and proccess relocations
DEBUG(dbgs() << "Parse relocations:\n");
@@ -145,7 +152,7 @@
// If it's first relocation in this section, find its SectionID
if (isFirstRelocation) {
- SectionID = findOrEmitSection(*si, true, LocalSections);
+ SectionID = findOrEmitSection(*obj, *si, true, LocalSections);
DEBUG(dbgs() << "\tSectionID: " << SectionID << "\n");
isFirstRelocation = false;
}
@@ -164,10 +171,14 @@
processRelocationRef(RI, *obj, LocalSections, LocalSymbols, Stubs);
}
}
+
+ handleObjectLoaded(obj.take());
+
return false;
}
-unsigned RuntimeDyldImpl::emitCommonSymbols(const CommonSymbolMap &Map,
+unsigned RuntimeDyldImpl::emitCommonSymbols(ObjectImage &Obj,
+ const CommonSymbolMap &Map,
uint64_t TotalSize,
LocalSymbolMap &LocalSymbols) {
// Allocate memory for the section
@@ -191,6 +202,7 @@
uint64_t Size = it->second;
StringRef Name;
it->first.getName(Name);
+ Obj.updateSymbolAddress(it->first, (uint64_t)Addr);
LocalSymbols[Name.data()] = SymbolLoc(SectionID, Offset);
Offset += Size;
Addr += Size;
@@ -199,7 +211,8 @@
return SectionID;
}
-unsigned RuntimeDyldImpl::emitSection(const SectionRef &Section,
+unsigned RuntimeDyldImpl::emitSection(ObjectImage &Obj,
+ const SectionRef &Section,
bool IsCode) {
unsigned StubBufSize = 0,
@@ -257,6 +270,7 @@
<< " StubBufSize: " << StubBufSize
<< " Allocate: " << Allocate
<< "\n");
+ Obj.updateSectionAddress(Section, (uint64_t)Addr);
}
else {
// Even if we didn't load the section, we need to record an entry for it
@@ -277,7 +291,8 @@
return SectionID;
}
-unsigned RuntimeDyldImpl::findOrEmitSection(const SectionRef &Section,
+unsigned RuntimeDyldImpl::findOrEmitSection(ObjectImage &Obj,
+ const SectionRef &Section,
bool IsCode,
ObjSectionToIDMap &LocalSections) {
@@ -286,7 +301,7 @@
if (i != LocalSections.end())
SectionID = i->second;
else {
- SectionID = emitSection(Section, IsCode);
+ SectionID = emitSection(Obj, Section, IsCode);
LocalSections[Section] = SectionID;
}
return SectionID;