Fix a backwards compatibility bug found by Tanya. In version 1.2, the
global type plane starts with a length and the TypeTyID value to identify
the type plane has having type definitions. This doesn't happen in 1.3
because the types are read from a known position in the file. However, the
TypeTyID must be read in (and ignored) if its a 1.2 bytecode file.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14728 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Bytecode/Reader/Reader.cpp b/lib/Bytecode/Reader/Reader.cpp
index 14f6c9f..1b11f22 100644
--- a/lib/Bytecode/Reader/Reader.cpp
+++ b/lib/Bytecode/Reader/Reader.cpp
@@ -1641,6 +1641,11 @@
void BytecodeReader::ParseGlobalTypes() {
// Read the number of types
unsigned NumEntries = read_vbr_uint();
+
+ // Ignore the type plane identifier for types if the bc file is pre 1.3
+ if (hasTypeDerivedFromValue)
+ read_vbr_uint();
+
ParseTypeConstants(ModuleTypes, NumEntries);
}