Added a dwarf4 test.

Author: clayborg

lldb/test/Shell/SymbolFile/DWARF/x86/dwp-separate-debug-file.cpp

@@ -1,12 +1,12 @@
 // REQUIRES: lld
 
-// RUN: %clang -target x86_64-pc-linux -gsplit-dwarf -g -c %s -o %t.o
-// RUN: ld.lld %t.o -o %t
-// RUN: llvm-dwp %t.dwo -o %t.dwp
-// RUN: rm %t.dwo
-// RUN: llvm-objcopy --only-keep-debug %t %t.debug
-// RUN: llvm-objcopy --strip-all --add-gnu-debuglink=%t.debug %t
-// RUN: %lldb %t -o "target variable a" -b | FileCheck %s
+// RUN: %clang -target x86_64-pc-linux -gsplit-dwarf -gdwarf-5 -c %s -o %t.dwarf5.o
+// RUN: ld.lld %t.dwarf5.o -o %t.dwarf5
+// RUN: llvm-dwp %t.dwarf5.dwo -o %t.dwarf5.dwp
+// RUN: rm %t.dwarf5.dwo
+// RUN: llvm-objcopy --only-keep-debug %t.dwarf5 %t.dwarf5.debug
+// RUN: llvm-objcopy --strip-all --add-gnu-debuglink=%t.dwarf5.debug %t.dwarf5
+// RUN: %lldb %t.dwarf5 -o "target variable a" -b | FileCheck %s
 
 // Run one time with the index cache enabled to populate the index cache. When
 // we populate the index cache we have to parse all of the DWARF debug info
@@ -18,7 +18,7 @@
 // RUN:   -O 'settings set target.preload-symbols false' \
 // RUN:   -o "script lldb.target.modules[0].FindTypes('::A').GetTypeAtIndex(0)" \
 // RUN:   -o "statistics dump" \
-// RUN:   %t -b | FileCheck %s -check-prefix=CACHE
+// RUN:   %t.dwarf5 -b | FileCheck %s -check-prefix=CACHE
 
 // Run again after index cache was enabled, which load the index cache. When we
 // load the index cache from disk, we don't have any DWARF parsed yet and this
@@ -32,7 +32,42 @@
 // RUN:   -O 'settings set target.preload-symbols false' \
 // RUN:   -o "script lldb.target.modules[0].FindTypes('::A').GetTypeAtIndex(0)" \
 // RUN:   -o "statistics dump" \
-// RUN:   %t -b | FileCheck %s -check-prefix=CACHED
+// RUN:   %t.dwarf5 -b | FileCheck %s -check-prefix=CACHED
+
+// Now test with DWARF4
+// RUN: %clang -target x86_64-pc-linux -gsplit-dwarf -gdwarf-4 -c %s -o %t.dwarf4.o
+// RUN: ld.lld %t.dwarf4.o -o %t.dwarf4
+// RUN: llvm-dwp %t.dwarf4.dwo -o %t.dwarf4.dwp
+// RUN: rm %t.dwarf4.dwo
+// RUN: llvm-objcopy --only-keep-debug %t.dwarf4 %t.dwarf4.debug
+// RUN: llvm-objcopy --strip-all --add-gnu-debuglink=%t.dwarf4.debug %t.dwarf4
+// RUN: %lldb %t.dwarf4 -o "target variable a" -b | FileCheck %s
+
+// Run one time with the index cache enabled to populate the index cache. When
+// we populate the index cache we have to parse all of the DWARF debug info
+// and it is always available.
+// RUN: rm -rf %T/lldb-index-cache
+// RUN: %lldb \
+// RUN:   -O 'settings set symbols.enable-lldb-index-cache true' \
+// RUN:   -O 'settings set symbols.lldb-index-cache-path %T/lldb-index-cache' \
+// RUN:   -O 'settings set target.preload-symbols false' \
+// RUN:   -o "script lldb.target.modules[0].FindTypes('::A').GetTypeAtIndex(0)" \
+// RUN:   -o "statistics dump" \
+// RUN:   %t.dwarf4 -b | FileCheck %s -check-prefix=CACHE
+
+// Run again after index cache was enabled, which load the index cache. When we
+// load the index cache from disk, we don't have any DWARF parsed yet and this
+// can cause us to try and access information in the .dwp directly without
+// parsing the .debug_info, but this caused crashes when the DWO files didn't
+// have a backlink to the skeleton compile unit. This test verifies that we
+// don't crash and that we can find types when using .dwp files.
+// RUN: %lldb \
+// RUN:   -O 'settings set symbols.enable-lldb-index-cache true' \
+// RUN:   -O 'settings set symbols.lldb-index-cache-path %T/lldb-index-cache' \
+// RUN:   -O 'settings set target.preload-symbols false' \
+// RUN:   -o "script lldb.target.modules[0].FindTypes('::A').GetTypeAtIndex(0)" \
+// RUN:   -o "statistics dump" \
+// RUN:   %t.dwarf4 -b | FileCheck %s -check-prefix=CACHED
 
 // CHECK: (A) a = (x = 47)