public ProfileData ParseIBCDataFromModule(EcmaModule ecmaModule)
{
ResourceData peResources = new ResourceData(ecmaModule);
byte[] ibcDataSection = peResources.FindResource("PROFILE_DATA", "IBC", 0);
if (ibcDataSection == null)
{
// If we don't have profile data, return empty ProfileData object
return(EmptyProfileData.Singleton);
}
var reader = new IBCDataReader();
int pos = 0;
bool basicBlocksOnly = false;
AssemblyData parsedData = reader.Read(ibcDataSection, ref pos, out bool minified);
if (parsedData.FormatMajorVersion == 1)
{
throw new Exception("Unsupported V1 IBC Format");
}
Dictionary <IBCBlobKey, BlobEntry> blobs = GetIBCBlobs(parsedData.BlobStream, out HashSet <uint> ignoredIbcMethodSpecTokens);
List <MethodProfileData> methodProfileData = new List <MethodProfileData>();
IBCModule ibcModule = new IBCModule(ecmaModule, blobs);
// Parse the token lists
IBCData.SectionIteratorKind iteratorKind = basicBlocksOnly ? IBCData.SectionIteratorKind.BasicBlocks : IBCData.SectionIteratorKind.TokenFlags;
foreach (SectionFormat section in IBCData.SectionIterator(iteratorKind))
{
if (!parsedData.Tokens.TryGetValue(section, out List <TokenData> TokenList) ||
TokenList.Count == 0)
{
continue;
}
// In V1 and minified V3+ files, tokens aren't stored with a
// scenario mask. In minified V3+ files, it can be treated as
// anything nonzero--minified files make no guarantee about
// preserving scenario information, but the flags must be left
// alone.
const uint scenarioMaskIfMissing = 1u;
HashSet <MethodDesc> methodsFoundInData = new HashSet <MethodDesc>();
foreach (TokenData entry in TokenList)
{
//
// Discard any token list entries which refer to the ParamMethodSpec blob stream entries
// (if any) which were thrown away above. Note that the MethodProfilingData token list is
// the only place anywhere in the IBC data which can ever contain an embedded ibcMethodSpec
// token.
//
if (section == SectionFormat.MethodProfilingData)
{
if (ignoredIbcMethodSpecTokens.Contains(entry.Token))
{
continue;
}
}
uint scenarioMask = entry.ScenarioMask ?? scenarioMaskIfMissing;
// scenarioMask will be 0 in unprocessed or V1 IBC data.
if (scenarioMask == 0)
{
// TODO Compute RunOnce and RunNever from basic block data
scenarioMask = scenarioMaskIfMissing;
/* Debug.Assert(fullScenarioMask == 1, "Token entry not owned by one scenario");
* // We have to compute the RunOnceMethod and RunNeverMethod flags.
* entry.Flags = result.GetFlags(entry.Flags, section, entry.Token);
* scenarioMask = defaultScenarioMask;*/
}
// Debug.Assert(((~fullScenarioMask & scenarioMask) == 0), "Illegal scenarios mask");
MethodDesc associatedMethod = null;
switch (Cor.Macros.TypeFromToken(entry.Token))
{
case CorTokenType.mdtMethodDef:
case CorTokenType.mdtMemberRef:
case CorTokenType.mdtMethodSpec:
object metadataObject = ecmaModule.GetObject(System.Reflection.Metadata.Ecma335.MetadataTokens.EntityHandle((int)entry.Token));
if (metadataObject is MethodDesc)
{
associatedMethod = (MethodDesc)metadataObject;
}
else
{
if (_logger.IsVerbose)
{
_logger.Writer.WriteLine($"Token {(int)entry.Token:x} does not refer to a method");
}
}
break;
case CorTokenType.ibcMethodSpec:
{
if (!blobs.TryGetValue(new IBCBlobKey(entry.Token, BlobType.ParamMethodSpec), out BlobEntry blobEntry))
{
throw new Exception($"Missing blob entry for ibcMethodSpec {entry.Token:x}");
}
BlobEntry.SignatureEntry paramSignatureEntry = blobEntry as BlobEntry.SignatureEntry;
if (paramSignatureEntry == null)
{
throw new Exception($"Blob entry for {entry.Token:x} is invalid");
}
unsafe
{
fixed(byte *pb = ¶mSignatureEntry.Signature[0])
{
BlobReader br = new BlobReader(pb, paramSignatureEntry.Signature.Length);
associatedMethod = GetSigMethodInstantiationFromIBCMethodSpec(ibcModule, br);
}
}
}
break;
}
if (associatedMethod != null)
{
if (methodsFoundInData.Add(associatedMethod))
{
methodProfileData.Add(new MethodProfileData(associatedMethod, (MethodProfilingDataFlags)entry.Flags, 0, null, scenarioMask, null));
}
else
{
if (_logger.IsVerbose)
{
_logger.Writer.WriteLine($"Multiple copies of data for method '{associatedMethod}' found.");
}
}
}
}
}
return(new IBCProfileData(parsedData.PartialNGen, methodProfileData));
}