[ESI] [Python] Move functionality through the C API (#1595)

Necessary to avoid linking issues on Windows.

include/circt-c/Dialect/ESI.h

@@ -32,6 +32,11 @@ MLIR_CAPI_EXPORTED MlirOperation circtESIWrapModule(MlirOperation cModOp,
                                                     long numPorts,
                                                     const MlirStringRef *ports);
 
+MLIR_CAPI_EXPORTED void circtESIAppendMlirFile(MlirModule,
+                                               MlirStringRef fileName);
+MLIR_CAPI_EXPORTED MlirOperation circtESILookup(MlirModule,
+                                                MlirStringRef symbol);
+
 #ifdef __cplusplus
 }
 #endif

lib/Bindings/Python/ESIModule.cpp

@@ -9,17 +9,11 @@
 #include "DialectModules.h"
 
 #include "circt-c/Dialect/ESI.h"
-#include "circt/Dialect/ESI/ESIDialect.h"
-#include "circt/Dialect/ESI/ESITypes.h"
-#include "circt/Support/LLVM.h"
 #include "mlir-c/Bindings/Python/Interop.h"
 
 #include "mlir/Bindings/Python/PybindAdaptors.h"
 #include "mlir/CAPI/IR.h"
 #include "mlir/CAPI/Support.h"
-#include "mlir/IR/Builders.h"
-#include "mlir/Parser.h"
-#include "mlir/Support/FileUtilities.h"
 
 #include "llvm/ADT/SmallVector.h"
 
@@ -28,9 +22,6 @@
 #include <pybind11/stl.h>
 namespace py = pybind11;
 
-using namespace circt;
-using namespace circt::esi;
-
 //===----------------------------------------------------------------------===//
 // The main entry point into the ESI Assembly API.
 //===----------------------------------------------------------------------===//
@@ -45,21 +36,13 @@ public:
 
   /// Load the contents of an MLIR asm file into the system module.
   void loadMlir(std::string filename) {
-    auto loadedMod = mlir::parseSourceFile(filename, ctxt());
-    Block *loadedBlock = loadedMod->getBody();
-    ModuleOp modOp = mod();
-    assert(!modOp->getRegions().empty());
-    if (modOp.body().empty()) {
-      modOp.body().push_back(loadedBlock);
-      return;
-    }
-    auto &ops = modOp.getBody()->getOperations();
-    ops.splice(ops.end(), loadedBlock->getOperations());
+    circtESIAppendMlirFile(cModuleOp,
+                           mlirStringRefCreateFromCString(filename.c_str()));
   }
 
   MlirOperation lookup(std::string symbol) {
-    Operation *found = SymbolTable::lookupSymbolIn(mod(), symbol);
-    return wrap(found);
+    return circtESILookup(cModuleOp,
+                          mlirStringRefCreateFromCString(symbol.c_str()));
   }
 
   void printCapnpSchema(py::object fileObject) {
@@ -70,9 +53,6 @@ public:
   }
 
 private:
-  MLIRContext *ctxt() { return unwrap(cCtxt); }
-  ModuleOp mod() { return unwrap(cModuleOp); }
-
   MlirContext cCtxt;
   MlirModule cModuleOp;
 };

lib/CAPI/Dialect/ESI.cpp

@@ -9,8 +9,12 @@
 #include "mlir/CAPI/Support.h"
 #include "mlir/CAPI/Utils.h"
 #include "mlir/IR/Builders.h"
+#include "mlir/IR/SymbolTable.h"
+#include "mlir/Parser.h"
+#include "mlir/Support/FileUtilities.h"
 
 using namespace circt::esi;
+using namespace mlir;
 
 MLIR_DEFINE_CAPI_DIALECT_REGISTRATION(ESI, esi, circt::esi::ESIDialect)
 
@@ -48,3 +52,19 @@ MlirOperation circtESIWrapModule(MlirOperation cModOp, long numPorts,
   mlir::Operation *wrapper = buildESIWrapper(b, modOp, portTriples);
   return wrap(wrapper);
 }
+
+void circtESIAppendMlirFile(MlirModule cMod, MlirStringRef filename) {
+  ModuleOp modOp = unwrap(cMod);
+  auto loadedMod = parseSourceFile(unwrap(filename), modOp.getContext());
+  Block *loadedBlock = loadedMod->getBody();
+  assert(!modOp->getRegions().empty());
+  if (modOp.body().empty()) {
+    modOp.body().push_back(loadedBlock);
+    return;
+  }
+  auto &ops = modOp.getBody()->getOperations();
+  ops.splice(ops.end(), loadedBlock->getOperations());
+}
+MlirOperation circtESILookup(MlirModule mod, MlirStringRef symbol) {
+  return wrap(SymbolTable::lookupSymbolIn(unwrap(mod), unwrap(symbol)));
+}