[llvm-profgen][NFC] Factor out parseAddress

[aaupov]

Replace StringRef::getAsInteger(16) calls with explicit parseAddress to
make it easier to support buildid-prefixed addresses in a follow-up (#190863).

[github-actions]

✅ With the latest revision this PR passed the C/C++ code formatter.

[llvmbot]

@llvm/pr-subscribers-pgo

Author: Amir Ayupov (aaupov)

Changes

Replace StringRef::getAsInteger(16) calls with explicit parseAddress to
make it easier to support buildid-prefixed addresses in a follow-up (#190863).

---

Full diff: https://github.com/llvm/llvm-project/pull/191594.diff

1 Files Affected:

• (modified) llvm/tools/llvm-profgen/PerfReader.cpp (+12-5)

diff --git a/llvm/tools/llvm-profgen/PerfReader.cpp b/llvm/tools/llvm-profgen/PerfReader.cpp
index bbfde1256f2cc..0d90a77fca185 100644
--- a/llvm/tools/llvm-profgen/PerfReader.cpp
+++ b/llvm/tools/llvm-profgen/PerfReader.cpp
@@ -656,6 +656,13 @@ void HybridPerfReader::unwindSamples() {
                      "frame to match.");
 }
 
+/// Parse a hex address from \p Str.
+static bool parseAddress(StringRef Str, uint64_t &Addr, bool HasPrefix) {
+  if (Str.consume_front("0x") != HasPrefix)
+    return false;
+  return Str.getAsInteger(16, Addr);
+}
+
 bool PerfScriptReader::extractLBRStack(TraceStream &TraceIt,
                                        SmallVectorImpl<LBREntry> &LBRStack) {
   // The raw format of LBR stack is like:
@@ -674,7 +681,7 @@ bool PerfScriptReader::extractLBRStack(TraceStream &TraceIt,
   size_t Index = 0;
   uint64_t LeadingAddr;
   if (!Records.empty() && !Records[0].contains('/')) {
-    if (Records[0].getAsInteger(16, LeadingAddr)) {
+    if (parseAddress(Records[0], LeadingAddr, false)) {
       WarnInvalidLBR(TraceIt);
       TraceIt.advance();
       return false;
@@ -696,8 +703,8 @@ bool PerfScriptReader::extractLBRStack(TraceStream &TraceIt,
     uint64_t Dst;
 
     // Stop at broken LBR records.
-    if (Addresses.size() < 2 || Addresses[0].substr(2).getAsInteger(16, Src) ||
-        Addresses[1].substr(2).getAsInteger(16, Dst)) {
+    if (Addresses.size() < 2 || parseAddress(Addresses[0], Src, true) ||
+        parseAddress(Addresses[1], Dst, true)) {
       WarnInvalidLBR(TraceIt);
       break;
     }
@@ -733,7 +740,7 @@ bool PerfScriptReader::extractCallstack(TraceStream &TraceIt,
   while (!TraceIt.isAtEoF() && !TraceIt.getCurrentLine().starts_with(" 0x")) {
     StringRef FrameStr = TraceIt.getCurrentLine().ltrim();
     uint64_t FrameAddr = 0;
-    if (FrameStr.getAsInteger(16, FrameAddr)) {
+    if (parseAddress(FrameStr, FrameAddr, false)) {
       // We might parse a non-perf sample line like empty line and comments,
       // skip it
       TraceIt.advance();
@@ -1201,7 +1208,7 @@ PerfContent PerfScriptReader::checkPerfScriptType(StringRef FileName) {
     // Detect sample with call stack
     int32_t Count = 0;
     while (!TraceIt.isAtEoF() &&
-           !TraceIt.getCurrentLine().ltrim().getAsInteger(16, FrameAddr)) {
+           !parseAddress(TraceIt.getCurrentLine().ltrim(), FrameAddr, false)) {
       Count++;
       TraceIt.advance();
     }

[HighW4y2H3ll]

LGTM! Thanks for cleanning up the Address parsing!