public void BuildCFIMap(NodeFactory factory, ObjectNode node)
{
_offsetToCfis.Clear();
_offsetToCfiStart.Clear();
_offsetToCfiEnd.Clear();
_frameOpened = false;
INodeWithCodeInfo nodeWithCodeInfo = node as INodeWithCodeInfo;
if (nodeWithCodeInfo == null)
{
return;
}
FrameInfo[] frameInfos = nodeWithCodeInfo.FrameInfos;
if (frameInfos == null)
{
return;
}
ObjectNode.ObjectData ehInfo = nodeWithCodeInfo.EHInfo;
int i = 0;
foreach (var frameInfo in frameInfos)
{
int start = frameInfo.StartOffset;
int end = frameInfo.EndOffset;
int len = frameInfo.BlobData.Length;
byte[] blob = frameInfo.BlobData;
if (_targetPlatform.OperatingSystem == TargetOS.Windows)
{
string blobSymbolName = "_unwind" + (i++).ToStringInvariant() + _currentNodeName;
ObjectNodeSection section = ObjectNodeSection.XDataSection;
if (node.ShouldShareNodeAcrossModules(factory) && factory.Target.OperatingSystem == TargetOS.Windows)
{
section = section.GetSharedSection(blobSymbolName);
CreateCustomSection(section);
}
SwitchSection(_nativeObjectWriter, section.Name);
EmitAlignment(4);
EmitSymbolDef(blobSymbolName);
if (ehInfo != null)
{
blob[blob.Length - 1] |= 0x04; // Flag to indicate that EHClauses follows
}
EmitBlob(blob);
if (ehInfo != null)
{
Debug.Assert(ehInfo.Alignment == 1);
Debug.Assert(ehInfo.DefinedSymbols.Length == 0);
EmitBlobWithRelocs(ehInfo.Data, ehInfo.Relocs);
ehInfo = null;
}
// TODO: Currently we get linker errors if we emit frame info for shared types.
// This needs follow-up investigation.
if (!node.ShouldShareNodeAcrossModules(factory))
{
// For window, just emit the frame blob (UNWIND_INFO) as a whole.
EmitWinFrameInfo(start, end, len, blobSymbolName);
}
EnsureCurrentSection();
}
else
{
// For Unix, we build CFI blob map for each offset.
Debug.Assert(len % CfiCodeSize == 0);
// Record start/end of frames which shouldn't be overlapped.
_offsetToCfiStart.Add(start);
_offsetToCfiEnd.Add(end);
for (int j = 0; j < len; j += CfiCodeSize)
{
// The first byte of CFI_CODE is offset from the range the frame covers.
// Compute code offset from the root method.
int codeOffset = blob[j] + start;
List <byte[]> cfis;
if (!_offsetToCfis.TryGetValue(codeOffset, out cfis))
{
cfis = new List <byte[]>();
_offsetToCfis.Add(codeOffset, cfis);
}
byte[] cfi = new byte[CfiCodeSize];
Array.Copy(blob, j, cfi, 0, CfiCodeSize);
cfis.Add(cfi);
}
}
}
}
public static void EmitObject(string objectFilePath, IEnumerable <DependencyNode> nodes, NodeFactory factory)
{
using (ObjectWriter objectWriter = new ObjectWriter(objectFilePath, factory))
{
// TODO: Exception handling on Unix
if (factory.Target.IsWindows)
{
objectWriter.CreateCustomSection(MethodCodeNode.ContentSection);
// Emit sentinels for managed code section.
ObjectNodeSection codeStartSection = factory.CompilationModuleGroup.IsSingleFileCompilation ? MethodCodeNode.StartSection : MethodCodeNode.StartSection.GetSharedSection("__managedcode_a");
objectWriter.SetSection(codeStartSection);
objectWriter.EmitSymbolDef("__managedcode_a");
objectWriter.EmitIntValue(0, 1);
ObjectNodeSection codeEndSection = factory.CompilationModuleGroup.IsSingleFileCompilation ? MethodCodeNode.EndSection : MethodCodeNode.EndSection.GetSharedSection("__managedcode_z");
objectWriter.SetSection(codeEndSection);
objectWriter.EmitSymbolDef("__managedcode_z");
objectWriter.EmitIntValue(0, 1);
}
// Build file info map.
objectWriter.BuildFileInfoMap(nodes);
foreach (DependencyNode depNode in nodes)
{
ObjectNode node = depNode as ObjectNode;
if (node == null)
{
continue;
}
if (node.ShouldSkipEmittingObjectNode(factory))
{
continue;
}
#if DEBUG
Debug.Assert(_previouslyWrittenNodeNames.Add(node.GetName()), "Duplicate node name emitted to file", "Node {0} has already been written to the output object file {1}", node.GetName(), objectFilePath);
#endif
ObjectNode.ObjectData nodeContents = node.GetData(factory);
ObjectNodeSection section = node.Section;
if (node.ShouldShareNodeAcrossModules(factory) && factory.Target.OperatingSystem == TargetOS.Windows)
{
Debug.Assert(node is ISymbolNode);
section = section.GetSharedSection(((ISymbolNode)node).MangledName);
}
// Ensure section and alignment for the node.
objectWriter.SetSection(section);
objectWriter.EmitAlignment(nodeContents.Alignment);
// Build symbol definition map.
objectWriter.BuildSymbolDefinitionMap(node, nodeContents.DefinedSymbols);
// Build CFI map (Unix) or publish unwind blob (Windows).
objectWriter.BuildCFIMap(factory, node);
// Build debug location map
objectWriter.BuildDebugLocInfoMap(node);
Relocation[] relocs = nodeContents.Relocs;
int nextRelocOffset = -1;
int nextRelocIndex = -1;
if (relocs.Length > 0)
{
nextRelocOffset = relocs[0].Offset;
nextRelocIndex = 0;
}
int i = 0;
while (i < nodeContents.Data.Length)
{
// Emit symbol definitions if necessary
objectWriter.EmitSymbolDefinition(i);
// Emit CFI codes for the given offset.
objectWriter.EmitCFICodes(i);
// Emit debug loc info if needed.
objectWriter.EmitDebugLocInfo(i);
if (i == nextRelocOffset)
{
Relocation reloc = relocs[nextRelocIndex];
int size = objectWriter.EmitSymbolReference(reloc.Target, reloc.Delta, reloc.RelocType);
// Update nextRelocIndex/Offset
if (++nextRelocIndex < relocs.Length)
{
nextRelocOffset = relocs[nextRelocIndex].Offset;
}
i += size;
}
else
{
objectWriter.EmitIntValue(nodeContents.Data[i], 1);
i++;
}
}
// It is possible to have a symbol just after all of the data.
objectWriter.EmitSymbolDefinition(nodeContents.Data.Length);
// Emit the last CFI to close the frame.
objectWriter.EmitCFICodes(nodeContents.Data.Length);
if (objectWriter.HasFunctionDebugInfo())
{
// Build debug local var info
objectWriter.EmitDebugVarInfo(node);
objectWriter.EmitDebugFunctionInfo(nodeContents.Data.Length);
}
}
objectWriter.EmitDebugModuleInfo();
}
}
public void BuildCFIMap(NodeFactory factory, ObjectNode node)
{
_offsetToCfis.Clear();
_offsetToCfiStart.Clear();
_offsetToCfiEnd.Clear();
_offsetToCfiLsdaBlobName.Clear();
_frameOpened = false;
INodeWithCodeInfo nodeWithCodeInfo = node as INodeWithCodeInfo;
if (nodeWithCodeInfo == null)
{
return;
}
FrameInfo[] frameInfos = nodeWithCodeInfo.FrameInfos;
if (frameInfos == null)
{
return;
}
byte[] gcInfo = nodeWithCodeInfo.GCInfo;
ObjectNode.ObjectData ehInfo = nodeWithCodeInfo.EHInfo;
string mainEhInfoSymbolName = null;
for (int i = 0; i < frameInfos.Length; i++)
{
FrameInfo frameInfo = frameInfos[i];
int start = frameInfo.StartOffset;
int end = frameInfo.EndOffset;
int len = frameInfo.BlobData.Length;
byte[] blob = frameInfo.BlobData;
if (_targetPlatform.OperatingSystem == TargetOS.Windows)
{
string blobSymbolName = "_unwind" + i.ToStringInvariant() + _currentNodeName;
ObjectNodeSection section = ObjectNodeSection.XDataSection;
if (node.ShouldShareNodeAcrossModules(factory) && factory.Target.OperatingSystem == TargetOS.Windows)
{
section = section.GetSharedSection(blobSymbolName);
CreateCustomSection(section);
}
SwitchSection(_nativeObjectWriter, section.Name);
EmitAlignment(4);
EmitSymbolDef(blobSymbolName);
FrameInfoFlags flags = frameInfo.Flags;
if (ehInfo != null)
{
flags |= FrameInfoFlags.HasEHInfo;
}
EmitBlob(blob);
EmitIntValue((byte)flags, 1);
if (ehInfo != null)
{
mainEhInfoSymbolName = "_ehInfo" + _currentNodeName;
EmitSymbolRef(mainEhInfoSymbolName, RelocType.IMAGE_REL_BASED_ABSOLUTE);
}
if (gcInfo != null)
{
EmitBlob(gcInfo);
gcInfo = null;
}
if (ehInfo != null)
{
// TODO: Place EHInfo into different section for better locality
Debug.Assert(ehInfo.Alignment == 1);
Debug.Assert(ehInfo.DefinedSymbols.Length == 0);
EmitSymbolDef(mainEhInfoSymbolName);
EmitBlobWithRelocs(ehInfo.Data, ehInfo.Relocs);
ehInfo = null;
}
// TODO: Currently we get linker errors if we emit frame info for shared types.
// This needs follow-up investigation.
if (!node.ShouldShareNodeAcrossModules(factory))
{
// For window, just emit the frame blob (UNWIND_INFO) as a whole.
EmitWinFrameInfo(start, end, len, blobSymbolName);
}
}
else
{
string blobSymbolName = "_lsda" + i.ToStringInvariant() + _currentNodeName;
SwitchSection(_nativeObjectWriter, LsdaSection.Name);
EmitSymbolDef(blobSymbolName);
FrameInfoFlags flags = frameInfo.Flags;
if (ehInfo != null)
{
flags |= FrameInfoFlags.HasEHInfo;
}
EmitIntValue((byte)flags, 1);
if (i != 0)
{
EmitSymbolRef("_lsda0" + _currentNodeName, RelocType.IMAGE_REL_BASED_REL32, 4);
// emit relative offset from the main function
EmitIntValue((ulong)(start - frameInfos[0].StartOffset), 4);
}
if (ehInfo != null)
{
mainEhInfoSymbolName = "_ehInfo" + _currentNodeName;
EmitSymbolRef(mainEhInfoSymbolName, RelocType.IMAGE_REL_BASED_REL32, 4);
}
if (gcInfo != null)
{
EmitBlob(gcInfo);
gcInfo = null;
}
if (ehInfo != null)
{
// TODO: Place EHInfo into different section for better locality
Debug.Assert(ehInfo.Alignment == 1);
Debug.Assert(ehInfo.DefinedSymbols.Length == 0);
EmitSymbolDef(mainEhInfoSymbolName);
EmitBlobWithRelocs(ehInfo.Data, ehInfo.Relocs);
ehInfo = null;
}
// For Unix, we build CFI blob map for each offset.
Debug.Assert(len % CfiCodeSize == 0);
// Record start/end of frames which shouldn't be overlapped.
_offsetToCfiStart.Add(start);
_offsetToCfiEnd.Add(end);
_offsetToCfiLsdaBlobName.Add(start, blobSymbolName);
for (int j = 0; j < len; j += CfiCodeSize)
{
// The first byte of CFI_CODE is offset from the range the frame covers.
// Compute code offset from the root method.
int codeOffset = blob[j] + start;
List <byte[]> cfis;
if (!_offsetToCfis.TryGetValue(codeOffset, out cfis))
{
cfis = new List <byte[]>();
_offsetToCfis.Add(codeOffset, cfis);
}
byte[] cfi = new byte[CfiCodeSize];
Array.Copy(blob, j, cfi, 0, CfiCodeSize);
cfis.Add(cfi);
}
}
EnsureCurrentSection();
}
}
