[llvm-xray] Support for PIE

When the instrumented binary is linked as PIE, we need to apply the
relative relocations to sleds. This is handled by the dynamic linker
at runtime, but when processing the file we have to do it ourselves.

Differential Revision: https://reviews.llvm.org/D55542

llvm-svn: 349120

2 files changed, 11 insertions, 0 deletions

diff --git a/llvm/test/tools/llvm-xray/X86/Inputs/elf64-pie.bin b/llvm/test/tools/llvm-xray/X86/Inputs/elf64-pie.bin
new file mode 100755
index 00000000000..ab2745eeba8
--- /dev/null
+++ b/llvm/test/tools/llvm-xray/X86/Inputs/elf64-pie.bin
diff --git a/llvm/test/tools/llvm-xray/X86/extract-instrmap-pie.ll b/llvm/test/tools/llvm-xray/X86/extract-instrmap-pie.ll
new file mode 100644
index 00000000000..987aaf98010
--- /dev/null
+++ b/llvm/test/tools/llvm-xray/X86/extract-instrmap-pie.ll
@@ -0,0 +1,11 @@
+; This test makes sure we can extract the instrumentation map from an
+; XRay-instrumented PIE file.
+;
+; RUN: llvm-xray extract %S/Inputs/elf64-pie.bin -s | FileCheck %s
+
+; CHECK:      ---
+; CHECK-NEXT: - { id: 1, address: 0x00000000000299C0, function: 0x00000000000299C0, kind: function-enter, always-instrument: true, function-name: {{.*foo.*}} }
+; CHECK-NEXT: - { id: 1, address: 0x00000000000299D0, function: 0x00000000000299C0, kind: function-exit, always-instrument: true, function-name: {{.*foo.*}} }
+; CHECK-NEXT: - { id: 2, address: 0x00000000000299E0, function: 0x00000000000299E0, kind: function-enter, always-instrument: true, function-name: {{.*bar.*}} }
+; CHECK-NEXT: - { id: 2, address: 0x00000000000299F6, function: 0x00000000000299E0, kind: function-exit, always-instrument: true, function-name: {{.*bar.*}} }
+; CHECK-NEXT: ...