[OpenACC] Initial commits to support OpenACC (#70234)

Initial commits to support OpenACC.  This patchset:

adds a clang-command line argument '-fopenacc', and starts
 to define _OPENACC, albeit to '1' instead of the standardized
value (since we don't properly implement OpenACC yet).

The OpenACC spec defines `_OPENACC` to be equal to the latest standard
implemented. However, since we're not done implementing any standard,
we've defined this by default to be `1`. As it is useful to run our
compiler against existing OpenACC workloads, we're providing a
temporary override flag to change the `_OPENACC` value to be any
entirely digit value, permitting testing against any existing OpenACC
project.

Exactly like the OpenMP parser, the OpenACC pragma parser needs to
consume and reprocess the tokens. This patch sets up the infrastructure
to do so by refactoring the OpenMP version of this into a more general
version that works for OpenACC as well.

Additionally, this adds a few diagnostics and token kinds to get us
started.

1 files changed, 15 insertions, 0 deletions

diff --git a/clang/lib/Frontend/CompilerInvocation.cpp b/clang/lib/Frontend/CompilerInvocation.cpp
index efcf073..3f4ca02 100644
--- a/clang/lib/Frontend/CompilerInvocation.cpp
+++ b/clang/lib/Frontend/CompilerInvocation.cpp
@@ -3549,6 +3549,13 @@ void CompilerInvocationBase::GenerateLangArgs(const LangOptions &Opts,
   if (Opts.OpenMPCUDAMode)
     GenerateArg(Consumer, OPT_fopenmp_cuda_mode);
 
+  if (Opts.OpenACC) {
+    GenerateArg(Consumer, OPT_fopenacc);
+    if (!Opts.OpenACCMacroOverride.empty())
+      GenerateArg(Consumer, OPT_openacc_macro_override,
+                  Opts.OpenACCMacroOverride);
+  }
+
   // The arguments used to set Optimize, OptimizeSize and NoInlineDefine are
   // generated from CodeGenOptions.
 
@@ -4018,6 +4025,14 @@ bool CompilerInvocation::ParseLangArgs(LangOptions &Opts, ArgList &Args,
                         (T.isNVPTX() || T.isAMDGCN()) &&
                         Args.hasArg(options::OPT_fopenmp_cuda_mode);
 
+  // OpenACC Configuration.
+  if (Args.hasArg(options::OPT_fopenacc)) {
+    Opts.OpenACC = true;
+
+    if (Arg *A = Args.getLastArg(options::OPT_openacc_macro_override))
+      Opts.OpenACCMacroOverride = A->getValue();
+  }
+
   // FIXME: Eliminate this dependency.
   unsigned Opt = getOptimizationLevel(Args, IK, Diags),
        OptSize = getOptimizationLevelSize(Args);