[llvm-mca] Initial implementation of serialization using JSON. The views

implemented at this time are Summary, Timeline, ResourcePressure and InstructionInfo.
Use --json on the command line to obtain JSON output.

1 files changed, 14 insertions, 2 deletions

diff --git a/llvm/tools/llvm-mca/llvm-mca.cpp b/llvm/tools/llvm-mca/llvm-mca.cpp
index d122e64..13a2c63 100644
--- a/llvm/tools/llvm-mca/llvm-mca.cpp
+++ b/llvm/tools/llvm-mca/llvm-mca.cpp
@@ -96,6 +96,11 @@ static cl::opt<std::string>
           cl::desc("Additional target features."),
           cl::cat(ToolOptions));
 
+static cl::opt<bool>
+    PrintJson("json",
+          cl::desc("Print the output in json format"),
+          cl::cat(ToolOptions), cl::init(false));
+
 static cl::opt<int>
     OutputAsmVariant("output-asm-variant",
                      cl::desc("Syntax variant to use for output printing"),
@@ -501,7 +506,7 @@ int main(int argc, char **argv) {
       auto P = std::make_unique<mca::Pipeline>();
       P->appendStage(std::make_unique<mca::EntryStage>(S));
       P->appendStage(std::make_unique<mca::InstructionTables>(SM));
-      mca::PipelinePrinter Printer(*P);
+      mca::PipelinePrinter Printer(*P, mca::View::OK_READABLE);
 
       // Create the views for this pipeline, execute, and emit a report.
       if (PrintInstructionInfoView) {
@@ -520,7 +525,14 @@ int main(int argc, char **argv) {
 
     // Create a basic pipeline simulating an out-of-order backend.
     auto P = MCA.createDefaultPipeline(PO, S);
-    mca::PipelinePrinter Printer(*P);
+    mca::PipelinePrinter Printer(*P, PrintJson ? mca::View::OK_JSON
+                                               : mca::View::OK_READABLE);
+
+    // When we output JSON, we add a view that contains the instructions
+    // and CPU resource information.
+    if (PrintJson)
+      Printer.addView(
+          std::make_unique<mca::InstructionView>(*STI, *IP, Insts, MCPU));
 
     if (PrintSummaryView)
       Printer.addView(