simpleperf: Use CallChainJoiner.

1. In record cmd, split most code in Run() into three functions to make it easier to maintain.
2. In record cmd, use CallChainJoiner by default when -g option is used. And allow using
--no-callchain-joiner option to disable the joiner, and --callchain-joiner-min-matching-nodes
to adjust the joiner.
3. Adjust the interface of UnwindCallChain() to return sps used by the joiner.
4. Add functions in SampleRecord to use callchains returned by the joiner.
   Add CallChainRecord to keep callchains returned by the joiner for debugging.
5. In dump cmd, show callchains of SampleRecord and CallChainRecord for debugging.

Bug: http://b/69383534
Test: run simpleperf_unit_test.
Test: run python test.py.
Change-Id: I951b169dfba0f7c50b6d4d741df83f02f8010626

1 files changed, 19 insertions, 0 deletions

diff --git a/simpleperf/perf_regs.cpp b/simpleperf/perf_regs.cpp
index 6aa8bad0..33c64917 100644
--- a/simpleperf/perf_regs.cpp
+++ b/simpleperf/perf_regs.cpp
@@ -233,3 +233,22 @@ bool GetSpRegValue(const RegSet& regs, ArchType arch, uint64_t* value) {
   }
   return GetRegValue(regs, regno, value);
 }
+
+bool GetIpRegValue(const RegSet& regs, ArchType arch, uint64_t* value) {
+  size_t regno;
+  switch (arch) {
+    case ARCH_X86_64:
+    case ARCH_X86_32:
+      regno = PERF_REG_X86_IP;
+      break;
+    case ARCH_ARM:
+      regno = PERF_REG_ARM_PC;
+      break;
+    case ARCH_ARM64:
+      regno = PERF_REG_ARM64_PC;
+      break;
+    default:
+      return false;
+  }
+  return GetRegValue(regs, regno, value);
+}