[Lldb-commits] [lldb] 2e5b701 - This test includes a source that will produce basic blocks and hence sections with -fbasic-block-sections=all.

[Sriraman Tallam via lldb-commits]

Author: Sriraman Tallam
Date: 2020-10-16T21:31:42-07:00
New Revision: 2e5b701d9306e45d37d370b1496bff9604605c93

URL: https://github.com/llvm/llvm-project/commit/2e5b701d9306e45d37d370b1496bff9604605c93
DIFF: https://github.com/llvm/llvm-project/commit/2e5b701d9306e45d37d370b1496bff9604605c93.diff

LOG: 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

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

Modified: 
    

Removed: 
    


################################################################################
diff  --git a/lldb/test/Shell/Unwind/Inputs/basic-block-sections.c b/lldb/test/Shell/Unwind/Inputs/basic-block-sections.c
new file mode 100644
index 000000000000..728291aaa2d9
--- /dev/null
+++ b/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;
+}

diff  --git a/lldb/test/Shell/Unwind/basic-block-sections.test b/lldb/test/Shell/Unwind/basic-block-sections.test
new file mode 100644
index 000000000000..7b24a8675863
--- /dev/null
+++ b/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 +