This test includes a source that will produce basic blocks and hence sections with -fbasic-block-sections=all.

The test reorders the basic blocks to be dis-contiguous in the address space and checks if the back trace contains the right symbol.

Reviewed By: labath

Differential Revision: https://reviews.llvm.org/D89179

lldb/test/Shell/Unwind/Inputs/basic-block-sections.c

@@ -0,0 +1,18 @@
+int k = 1;
+
+int bar() {
+  return 0;
+}
+
+int foo() {
+  return bar();
+}
+
+int main() {
+  // Control flow to create basic block sections.
+  if (k)
+    foo();
+  else
+    bar();
+  return 0;
+}

lldb/test/Shell/Unwind/basic-block-sections.test

@@ -0,0 +1,49 @@
+# Test to check if using basic block sections to reorder basic blocks at
+# run-time still produces the right backtraces with lldb.
+
+# UNSUPPORTED: system-darwin, system-windows
+# REQUIRES: target-x86_64
+# REQUIRES: lld
+
+# RUN: %clang_host %p/Inputs/basic-block-sections.c -o %t
+# RUN: %lldb %t -s %s -o exit | FileCheck  %s --check-prefix=DEFAULT
+
+# RUN: %clang_host %p/Inputs/basic-block-sections.c -o %t -fbasic-block-sections=all
+# RUN: %lldb %t -s %s -o exit | FileCheck  %s --check-prefix=BBSECTIONS
+
+# Reorder basic blocks so that main's basic blocks are discontiguous
+# RUN: echo "main.3" > %t.order
+# RUN: echo "bar" >> %t.order
+# RUN: echo "main" >> %t.order
+# RUN: echo "main.2" >> %t.order
+# RUN: echo "foo" >> %t.order
+# RUN: echo "main.1" >> %t.order
+# RUN: %clang_host %p/Inputs/basic-block-sections.c -o %t -fbasic-block-sections=all -fuse-ld=lld -Wl,--symbol-ordering-file,%t.order -Wl,--warn-symbol-ordering -Wl,--fatal-warnings
+# RUN: %lldb %t -s %s -o exit | FileCheck  %s --check-prefix=BBSECTIONS
+
+# Test the reverse permutation too.
+# RUN: echo "main.1" > %t.order
+# RUN: echo "foo" >> %t.order
+# RUN: echo "main.2" >> %t.order
+# RUN: echo "main" >> %t.order
+# RUN: echo "bar" >> %t.order
+# RUN: echo "main.3" >> %t.order
+# RUN: %clang_host %p/Inputs/basic-block-sections.c -o %t -fbasic-block-sections=all -fuse-ld=lld -Wl,--symbol-ordering-file,%t.order -Wl,--warn-symbol-ordering -Wl,--fatal-warnings
+# RUN: %lldb %t -s %s -o exit | FileCheck  %s --check-prefix=BBSECTIONS
+
+breakpoint set -n bar
+# DEFAULT: Breakpoint 1: where = {{.*}}`bar
+# BBSECTIONS: Breakpoint 1: where = {{.*}}`bar
+
+process launch
+# DEFAULT: stop reason = breakpoint 1.1
+# BBSECTIONS: stop reason = breakpoint 1.1
+
+thread backtrace
+# DEFAULT: frame #0: {{.*}}`bar
+# DEFAULT: frame #1: {{.*}}`foo
+# DEFAULT: frame #2: {{.*}}`main +
+
+# BBSECTIONS: frame #0: {{.*}}`bar
+# BBSECTIONS: frame #1: {{.*}}`foo
+# BBSECTIONS: frame #2: {{.*}}`main.1 +