Use zlib to uncompress debug sections in DWARF parser.

This makes llvm-dwarfdump and llvm-symbolizer understand
debug info sections compressed by ld.gold linker.

llvm-svn: 180088

6 files changed, 41 insertions, 0 deletions

diff --git a/llvm/test/DebugInfo/Inputs/dwarfdump-test-zlib.cc b/llvm/test/DebugInfo/Inputs/dwarfdump-test-zlib.cc
new file mode 100644
index 00000000000..260c3c435c1
--- /dev/null
+++ b/llvm/test/DebugInfo/Inputs/dwarfdump-test-zlib.cc
@@ -0,0 +1,24 @@
+class DummyClass {
+  int a_;
+ public:
+  DummyClass(int a) : a_(a) {}
+  int add(int b) {
+    return a_ + b;
+  }
+};
+
+int f(int a, int b) {
+  DummyClass c(a);
+  return c.add(b);
+}
+
+int main() {
+  return f(2, 3);
+}
+
+// Built with Clang 3.2 and ld.gold linker:
+// $ mkdir -p /tmp/dbginfo
+// $ cp dwarfdump-test-zlib.cc /tmp/dbginfo
+// $ cd /tmp/dbginfo
+// $ clang++ -g dwarfdump-test-zlib.cc -Wl,--compress-debug-sections=zlib \
+//   -o <output>
diff --git a/llvm/test/DebugInfo/Inputs/dwarfdump-test-zlib.elf-x86-64 b/llvm/test/DebugInfo/Inputs/dwarfdump-test-zlib.elf-x86-64
new file mode 100755
index 00000000000..16b3153939f
--- /dev/null
+++ b/llvm/test/DebugInfo/Inputs/dwarfdump-test-zlib.elf-x86-64
diff --git a/llvm/test/DebugInfo/dwarfdump-zlib.test b/llvm/test/DebugInfo/dwarfdump-zlib.test
new file mode 100644
index 00000000000..8ce2cf7690d
--- /dev/null
+++ b/llvm/test/DebugInfo/dwarfdump-zlib.test
@@ -0,0 +1,12 @@
+REQUIRES: zlib
+
+RUN: llvm-dwarfdump %p/Inputs/dwarfdump-test-zlib.elf-x86-64  \
+RUN:   | FileCheck %s -check-prefix FULLDUMP
+RUN: llvm-dwarfdump %p/Inputs/dwarfdump-test-zlib.elf-x86-64  \
+RUN:   --address=0x400559 --functions | FileCheck %s -check-prefix MAIN
+
+FULLDUMP: .debug_abbrev contents
+FULLDUMP: .debug_info contents
+
+MAIN: main
+MAIN-NEXT: /tmp/dbginfo{{[/\\]}}dwarfdump-test-zlib.cc:16
diff --git a/llvm/test/Makefile b/llvm/test/Makefile
index 8d05c57f862..2213319df81 100644
--- a/llvm/test/Makefile
+++ b/llvm/test/Makefile
@@ -141,6 +141,7 @@ lit.site.cfg: FORCE
 	@$(ECHOPATH) s=@LLVM_BINDINGS@=$(BINDINGS_TO_BUILD)=g >> lit.tmp
 	@$(ECHOPATH) s=@HOST_OS@=$(HOST_OS)=g >> lit.tmp
 	@$(ECHOPATH) s=@HOST_ARCH@=$(HOST_ARCH)=g >> lit.tmp
+	@$(ECHOPATH) s=@HAVE_LIBZ@=$(HAVE_LIBZ)=g >> lit.tmp
 	@sed -f lit.tmp $(PROJ_SRC_DIR)/lit.site.cfg.in > $@
 	@-rm -f lit.tmp
 
diff --git a/llvm/test/lit.cfg b/llvm/test/lit.cfg
index ea91f45754d..b423c6e80b7 100644
--- a/llvm/test/lit.cfg
+++ b/llvm/test/lit.cfg
@@ -268,6 +268,9 @@ if (config.llvm_use_sanitizer == "Memory" or
 if not 'hexagon' in config.target_triple:
     config.available_features.add("object-emission")
 
+if config.have_zlib == "1":
+    config.available_features.add("zlib")
+
 # llc knows whether he is compiled with -DNDEBUG.
 import subprocess
 try:
diff --git a/llvm/test/lit.site.cfg.in b/llvm/test/lit.site.cfg.in
index 8024b24fcde..3a680b28126 100644
--- a/llvm/test/lit.site.cfg.in
+++ b/llvm/test/lit.site.cfg.in
@@ -19,6 +19,7 @@ config.host_os = "@HOST_OS@"
 config.host_arch = "@HOST_ARCH@"
 config.llvm_use_intel_jitevents = "@LLVM_USE_INTEL_JITEVENTS@"
 config.llvm_use_sanitizer = "@LLVM_USE_SANITIZER@"
+config.have_zlib = "@HAVE_LIBZ@"
 
 # Support substitution of the tools_dir with user parameters. This is
 # used when we can't determine the tool dir at configuration time.