[clang] [llvm] [OffloadBundler] Rework the ctor of `OffloadTargetInfo` to support AMDGPU's generic target (PR #122629)

[Shilei Tian via llvm-commits]

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@@ -84,31 +84,27 @@ OffloadTargetInfo::OffloadTargetInfo(const StringRef Target,
     : BundlerConfig(BC) {
 
   // TODO: Add error checking from ClangOffloadBundler.cpp
-  auto TargetFeatures = Target.split(':');
-  auto TripleOrGPU = TargetFeatures.first.rsplit('-');
-
-  if (clang::StringToOffloadArch(TripleOrGPU.second) !=
-      clang::OffloadArch::UNKNOWN) {
-    auto KindTriple = TripleOrGPU.first.split('-');
-    this->OffloadKind = KindTriple.first;
-
-    // Enforce optional env field to standardize bundles
-    llvm::Triple t = llvm::Triple(KindTriple.second);
-    this->Triple = llvm::Triple(t.getArchName(), t.getVendorName(),
-                                t.getOSName(), t.getEnvironmentName());
-
-    this->TargetID = Target.substr(Target.find(TripleOrGPU.second));
-  } else {
-    auto KindTriple = TargetFeatures.first.split('-');
-    this->OffloadKind = KindTriple.first;
-
-    // Enforce optional env field to standardize bundles
-    llvm::Triple t = llvm::Triple(KindTriple.second);
-    this->Triple = llvm::Triple(t.getArchName(), t.getVendorName(),
-                                t.getOSName(), t.getEnvironmentName());
-
+  // <kind>-<triple>[-<target id>[:target features]]
+  // <triple> := <arch>-<vendor>-<os>-<env>
+  SmallVector<StringRef, 6> Components;
+  Target.split(Components, '-', /*MaxSplit=*/5);
+  assert((Components.size() == 5 || Components.size() == 6) &&
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shiltian wrote:

I added some error check mechanism but that is really limited. If someone still uses 3-field triple, they will get an error saying `<kind>-<arch>-<vendor>-<os>--` is not found.

We really can't tell whether a string is a valid data triple or not, given the flexibility of how data layout parsing is. However, it will error out later when it comes to comparison/

https://github.com/llvm/llvm-project/pull/122629