[bcanalyzer] Recognize more stream types
Summary:
`llvm-bcanalyzer` prints out the stream type of the file it is
analyzing. If the file begins with the LLVM IR magic number, it reports
a stream type of "LLVM IR". However, any other bitstream format is
reported as "unknown".
Add some checks for two other common bitstream formats: Clang AST
files, which begin with 'CPCH', and Clang serialized diagnostics, which
begin with 'DIAG'.
Test Plan: `check-llvm`
Reviewers: pcc, aprantl, mehdi_amini, davide, george.karpenkov, JDevlieghere
Reviewed By: JDevlieghere
Subscribers: JDevlieghere, bruno, davide, llvm-commits
Differential Revision: https://reviews.llvm.org/D41979
llvm-svn: 330529
diff --git a/llvm/tools/llvm-bcanalyzer/llvm-bcanalyzer.cpp b/llvm/tools/llvm-bcanalyzer/llvm-bcanalyzer.cpp
index 1252ed5..5b10b09 100644
--- a/llvm/tools/llvm-bcanalyzer/llvm-bcanalyzer.cpp
+++ b/llvm/tools/llvm-bcanalyzer/llvm-bcanalyzer.cpp
@@ -75,7 +75,9 @@
/// CurStreamTypeType - A type for CurStreamType
enum CurStreamTypeType {
UnknownBitstream,
- LLVMIRBitstream
+ LLVMIRBitstream,
+ ClangSerializedASTBitstream,
+ ClangSerializedDiagnosticsBitstream,
};
}
@@ -746,6 +748,35 @@
(double)Bits/8, (unsigned long)(Bits/32));
}
+static CurStreamTypeType ReadSignature(BitstreamCursor &Stream) {
+ char Signature[6];
+ Signature[0] = Stream.Read(8);
+ Signature[1] = Stream.Read(8);
+
+ // Autodetect the file contents, if it is one we know.
+ if (Signature[0] == 'C' && Signature[1] == 'P') {
+ Signature[2] = Stream.Read(8);
+ Signature[3] = Stream.Read(8);
+ if (Signature[2] == 'C' && Signature[3] == 'H')
+ return ClangSerializedASTBitstream;
+ } else if (Signature[0] == 'D' && Signature[1] == 'I') {
+ Signature[2] = Stream.Read(8);
+ Signature[3] = Stream.Read(8);
+ if (Signature[2] == 'A' && Signature[3] == 'G')
+ return ClangSerializedDiagnosticsBitstream;
+ } else {
+ Signature[2] = Stream.Read(4);
+ Signature[3] = Stream.Read(4);
+ Signature[4] = Stream.Read(4);
+ Signature[5] = Stream.Read(4);
+ if (Signature[0] == 'B' && Signature[1] == 'C' &&
+ Signature[2] == 0x0 && Signature[3] == 0xC &&
+ Signature[4] == 0xE && Signature[5] == 0xD)
+ return LLVMIRBitstream;
+ }
+ return UnknownBitstream;
+}
+
static bool openBitcodeFile(StringRef Path,
std::unique_ptr<MemoryBuffer> &MemBuf,
BitstreamCursor &Stream,
@@ -789,22 +820,7 @@
}
Stream = BitstreamCursor(ArrayRef<uint8_t>(BufPtr, EndBufPtr));
-
- // Read the stream signature.
- char Signature[6];
- Signature[0] = Stream.Read(8);
- Signature[1] = Stream.Read(8);
- Signature[2] = Stream.Read(4);
- Signature[3] = Stream.Read(4);
- Signature[4] = Stream.Read(4);
- Signature[5] = Stream.Read(4);
-
- // Autodetect the file contents, if it is one we know.
- CurStreamType = UnknownBitstream;
- if (Signature[0] == 'B' && Signature[1] == 'C' &&
- Signature[2] == 0x0 && Signature[3] == 0xC &&
- Signature[4] == 0xE && Signature[5] == 0xD)
- CurStreamType = LLVMIRBitstream;
+ CurStreamType = ReadSignature(Stream);
return false;
}
@@ -873,8 +889,18 @@
outs() << "\n";
outs() << " Stream type: ";
switch (CurStreamType) {
- case UnknownBitstream: outs() << "unknown\n"; break;
- case LLVMIRBitstream: outs() << "LLVM IR\n"; break;
+ case UnknownBitstream:
+ outs() << "unknown\n";
+ break;
+ case LLVMIRBitstream:
+ outs() << "LLVM IR\n";
+ break;
+ case ClangSerializedASTBitstream:
+ outs() << "Clang Serialized AST\n";
+ break;
+ case ClangSerializedDiagnosticsBitstream:
+ outs() << "Clang Serialized Diagnostics\n";
+ break;
}
outs() << " # Toplevel Blocks: " << NumTopBlocks << "\n";
outs() << "\n";