[llvm-dwp] Implement -e option

The binutils utility dwp has an option "-e" 
https://gcc.gnu.org/wiki/DebugFissionDWP
to specify an executable/library to get the list 
of *.dwo files from it. This option is particularly useful when 
someone runs the tool manually outside of a build system.
This diff adds an implementation of "-e" to llvm-dwp.

Test plan: make check-all

Differential revision: https://reviews.llvm.org/D37371

llvm-svn: 312409

8 files changed, 97 insertions, 0 deletions

diff --git a/llvm/test/tools/llvm-dwp/Inputs/dwos_list_from_exec/a.dwo b/llvm/test/tools/llvm-dwp/Inputs/dwos_list_from_exec/a.dwo
new file mode 100644
index 00000000000..b6c77343564
--- /dev/null
+++ b/llvm/test/tools/llvm-dwp/Inputs/dwos_list_from_exec/a.dwo
diff --git a/llvm/test/tools/llvm-dwp/Inputs/dwos_list_from_exec/b.dwo b/llvm/test/tools/llvm-dwp/Inputs/dwos_list_from_exec/b.dwo
new file mode 100644
index 00000000000..d9084945838
--- /dev/null
+++ b/llvm/test/tools/llvm-dwp/Inputs/dwos_list_from_exec/b.dwo
diff --git a/llvm/test/tools/llvm-dwp/Inputs/dwos_list_from_exec/c.dwo b/llvm/test/tools/llvm-dwp/Inputs/dwos_list_from_exec/c.dwo
new file mode 100644
index 00000000000..60779693c89
--- /dev/null
+++ b/llvm/test/tools/llvm-dwp/Inputs/dwos_list_from_exec/c.dwo
diff --git a/llvm/test/tools/llvm-dwp/Inputs/dwos_list_from_exec/d.dwo b/llvm/test/tools/llvm-dwp/Inputs/dwos_list_from_exec/d.dwo
new file mode 100644
index 00000000000..42401022c2e
--- /dev/null
+++ b/llvm/test/tools/llvm-dwp/Inputs/dwos_list_from_exec/d.dwo
diff --git a/llvm/test/tools/llvm-dwp/Inputs/dwos_list_from_exec/e.dwo b/llvm/test/tools/llvm-dwp/Inputs/dwos_list_from_exec/e.dwo
new file mode 100644
index 00000000000..edca66e3af1
--- /dev/null
+++ b/llvm/test/tools/llvm-dwp/Inputs/dwos_list_from_exec/e.dwo
diff --git a/llvm/test/tools/llvm-dwp/Inputs/dwos_list_from_exec/libd.so b/llvm/test/tools/llvm-dwp/Inputs/dwos_list_from_exec/libd.so
new file mode 100755
index 00000000000..56a30cf3caf
--- /dev/null
+++ b/llvm/test/tools/llvm-dwp/Inputs/dwos_list_from_exec/libd.so
diff --git a/llvm/test/tools/llvm-dwp/Inputs/dwos_list_from_exec/main b/llvm/test/tools/llvm-dwp/Inputs/dwos_list_from_exec/main
new file mode 100755
index 00000000000..a56edf63415
--- /dev/null
+++ b/llvm/test/tools/llvm-dwp/Inputs/dwos_list_from_exec/main
diff --git a/llvm/test/tools/llvm-dwp/X86/dwos_list_from_exec_simple.test b/llvm/test/tools/llvm-dwp/X86/dwos_list_from_exec_simple.test
new file mode 100644
index 00000000000..4bbc2fb7b62
--- /dev/null
+++ b/llvm/test/tools/llvm-dwp/X86/dwos_list_from_exec_simple.test
@@ -0,0 +1,97 @@
+REQUIRES: shell
+
+RUN: rm -rf %t
+RUN: mkdir %t
+RUN: cd %t
+RUN: cp %p/../Inputs/dwos_list_from_exec/a.dwo a.dwo
+RUN: cp %p/../Inputs/dwos_list_from_exec/b.dwo b.dwo
+RUN: cp %p/../Inputs/dwos_list_from_exec/c.dwo c.dwo
+RUN: cp %p/../Inputs/dwos_list_from_exec/d.dwo d.dwo
+RUN: cp %p/../Inputs/dwos_list_from_exec/e.dwo e.dwo
+RUN: cp %p/../Inputs/dwos_list_from_exec/main main
+RUN: cp %p/../Inputs/dwos_list_from_exec/libd.so libd.so
+RUN: llvm-dwp c.dwo e.dwo -e main -e libd.so -o pkg.dwp
+RUN: llvm-dwarfdump pkg.dwp | FileCheck %s
+
+Build commands for the test binaries:
+
+clang++ -Xclang -fdebug-compilation-dir -Xclang "./" -g -O0 -gsplit-dwarf a.cpp b.cpp -o main
+clang++ -g -O0 -gsplit-dwarf -c c.cpp -o c.o
+clang++ -Xclang -fdebug-compilation-dir -Xclang "./" -g -O0 -gsplit-dwarf -fPIC -shared d.cpp -o libd.so
+clang++ -g -O0 -gsplit-dwarf -c e.cpp -o e.o
+
+sources:
+a.cpp:
+  void a() {}
+
+b.cpp:
+  void b() {}
+  int main() {
+     return 0;
+  }
+
+c.cpp:
+  void c() {}
+
+d.cpp:
+  void d() {}
+
+e.cpp:
+  void e() {}
+
+CHECK-LABEL: .debug_abbrev.dwo contents:
+
+CHECK-LABEL: Abbrev table for offset:
+CHECK: DW_TAG_compile_unit
+CHECK: DW_TAG_subprogram
+
+CHECK-LABEL: Abbrev table for offset:
+CHECK: DW_TAG_compile_unit
+CHECK: DW_TAG_subprogram
+
+CHECK-LABEL: Abbrev table for offset:
+CHECK: DW_TAG_compile_unit
+CHECK: DW_TAG_subprogram
+
+CHECK-LABEL: Abbrev table for offset:
+CHECK: DW_TAG_compile_unit
+CHECK: DW_TAG_subprogram
+
+CHECK-LABEL: Abbrev table for offset:
+CHECK: DW_TAG_compile_unit
+CHECK: DW_TAG_subprogram
+
+CHECK: .debug_info.dwo contents:
+CHECK: [[AOFF:0x[0-9a-f]*]]:
+
+CHECK-LABEL: Compile Unit: length = {{.*}} version = 0x0004
+CHECK: DW_TAG_compile_unit
+CHECK:   DW_AT_name {{.*}} "c.cpp"
+CHECK:   DW_TAG_subprogram
+CHECK:     DW_AT_name {{.*}} "c"
+
+CHECK-LABEL: Compile Unit: length = {{.*}} version = 0x0004
+CHECK: DW_TAG_compile_unit
+CHECK:   DW_AT_name {{.*}} "e.cpp"
+CHECK:   DW_TAG_subprogram
+CHECK:     DW_AT_name {{.*}} "e"
+
+CHECK-LABEL: Compile Unit: length = {{.*}} version = 0x0004
+CHECK: DW_TAG_compile_unit
+CHECK:   DW_AT_name {{.*}} "a.cpp"
+CHECK:   DW_TAG_subprogram
+CHECK:     DW_AT_name {{.*}} "a"
+
+CHECK-LABEL: Compile Unit: length = {{.*}} version = 0x0004
+CHECK: DW_TAG_compile_unit
+CHECK:   DW_AT_name {{.*}} "b.cpp"
+CHECK:   DW_TAG_subprogram
+CHECK:     DW_AT_name {{.*}} "b"
+CHECK:   DW_TAG_subprogram
+CHECK:     DW_AT_name {{.*}} "main"
+
+CHECK-LABEL: Compile Unit: length = {{.*}} version = 0x0004
+CHECK: DW_TAG_compile_unit
+CHECK:   DW_AT_name {{.*}} "d.cpp"
+CHECK:   DW_TAG_subprogram
+CHECK:     DW_AT_name {{.*}} "d"