oilgen: change interface to support multiple calls in one cu

examples/compile-time-oil/.gitignore

@@ -2,5 +2,5 @@ oilgen
 OilVectorOfStrings
 OilVectorOfStrings.o
 jit.cpp
-JitCompiled.o
+JitCompiled.*.o
 

examples/compile-time-oil/Makefile

@@ -15,14 +15,11 @@ oilgen:
 	(cd ../../ && make oid-devel)
 	ln -s ../../build/oilgen oilgen
 
-JitCompiled.o: oilgen OilVectorOfStrings.o
-	./oilgen --exit-code -o JitCompiled.o -c ../../build/sample.oid.toml -d OilVectorOfStrings.o
-
-OilVectorOfStrings: OilVectorOfStrings.o JitCompiled.o
-	${CXX} ${CXXFLAGS} OilVectorOfStrings.o JitCompiled.o -o OilVectorOfStrings
+OilVectorOfStrings: oilgen OilVectorOfStrings.o
+	${CXX} ${CXXFLAGS} OilVectorOfStrings.o $$(./oilgen --exit-code -o JitCompiled.o -c ../../build/sample.oid.toml -d OilVectorOfStrings.o) -o OilVectorOfStrings
 
 all: OilVectorOfStrings
 
 clean:
-	rm -f oilgen OilVectorOfStrings{,.o,.o.dwarf} JitCompiled.o jit.cpp
+	rm -f oilgen OilVectorOfStrings{,.o,.o.dwarf} JitCompiled.*.o jit.cpp
 

src/OIGenerator.cpp

@@ -20,6 +20,7 @@
 
 #include <boost/core/demangle.hpp>
 #include <fstream>
+#include <iostream>
 #include <unordered_map>
 #include <variant>
 
@@ -122,15 +123,15 @@ OIGenerator::findOilTypesAndNames(drgnplusplus::program& prog) {
   return out;
 }
 
-bool OIGenerator::generateForType(const OICodeGen::Config& generatorConfig,
-                                  const OICompiler::Config& compilerConfig,
-                                  const drgn_qualified_type& type,
-                                  const std::string& linkageName,
-                                  SymbolService& symbols) {
+fs::path OIGenerator::generateForType(const OICodeGen::Config& generatorConfig,
+                                      const OICompiler::Config& compilerConfig,
+                                      const drgn_qualified_type& type,
+                                      const std::string& linkageName,
+                                      SymbolService& symbols) {
   auto codegen = OICodeGen::buildFromConfig(generatorConfig, symbols);
   if (!codegen) {
     LOG(ERROR) << "failed to initialise codegen";
-    return false;
+    return {};
   }
 
   std::string code =
@@ -142,7 +143,7 @@ bool OIGenerator::generateForType(const OICodeGen::Config& generatorConfig,
 
   if (!codegen->generate(code)) {
     LOG(ERROR) << "failed to generate code";
-    return false;
+    return {};
   }
 
   std::string sourcePath = sourceFileDumpPath;
@@ -156,7 +157,15 @@ bool OIGenerator::generateForType(const OICodeGen::Config& generatorConfig,
   }
 
   OICompiler compiler{{}, compilerConfig};
-  return compiler.compile(code, sourcePath, outputPath);
+
+  // TODO: Revert to outputPath and remove printing when typegraph is done.
+  fs::path tmpObject = outputPath;
+  tmpObject.replace_extension("." + linkageName + ".o");
+
+  if (!compiler.compile(code, sourcePath, tmpObject)) {
+    return {};
+  }
+  return tmpObject;
 }
 
 int OIGenerator::generate(fs::path& primaryObject, SymbolService& symbols) {
@@ -175,12 +184,6 @@ int OIGenerator::generate(fs::path& primaryObject, SymbolService& symbols) {
   std::vector<std::tuple<drgn_qualified_type, std::string>> oilTypes =
       findOilTypesAndNames(prog);
 
-  if (size_t count = oilTypes.size(); count > 1) {
-    LOG(WARNING) << "oilgen can currently only generate for one type per "
-                    "compilation unit and we found "
-                 << count;
-  }
-
   OICodeGen::Config generatorConfig{};
   OICompiler::Config compilerConfig{};
   if (!OIUtils::processConfigFile(configFilePath, compilerConfig,
@@ -192,8 +195,11 @@ int OIGenerator::generate(fs::path& primaryObject, SymbolService& symbols) {
 
   size_t failures = 0;
   for (const auto& [type, linkageName] : oilTypes) {
-    if (!generateForType(generatorConfig, compilerConfig, type, linkageName,
-                         symbols)) {
+    if (auto obj = generateForType(generatorConfig, compilerConfig, type,
+                                   linkageName, symbols);
+        !obj.empty()) {
+      std::cout << obj.string() << std::endl;
+    } else {
       LOG(WARNING) << "failed to generate for symbol `" << linkageName
                    << "`. this is non-fatal but the call will not work.";
       failures++;

src/OIGenerator.h

@@ -22,8 +22,6 @@
 #include "OICodeGen.h"
 #include "OICompiler.h"
 
-namespace fs = std::filesystem;
-
 namespace ObjectIntrospection {
 
 class OIGenerator {
@@ -44,9 +42,9 @@ class OIGenerator {
   }
 
  private:
-  fs::path outputPath;
-  fs::path configFilePath;
-  fs::path sourceFileDumpPath;
+  std::filesystem::path outputPath;
+  std::filesystem::path configFilePath;
+  std::filesystem::path sourceFileDumpPath;
   bool failIfNothingGenerated;
 
   std::unordered_map<std::string, std::string> oilStrongToWeakSymbolsMap(
@@ -55,10 +53,10 @@ class OIGenerator {
   std::vector<std::tuple<drgn_qualified_type, std::string>>
   findOilTypesAndNames(drgnplusplus::program& prog);
 
-  bool generateForType(const OICodeGen::Config& generatorConfig,
-                       const OICompiler::Config& compilerConfig,
-                       const drgn_qualified_type& type,
-                       const std::string& linkageName, SymbolService& symbols);
+  std::filesystem::path generateForType(
+      const OICodeGen::Config& generatorConfig,
+      const OICompiler::Config& compilerConfig, const drgn_qualified_type& type,
+      const std::string& linkageName, SymbolService& symbols);
 };
 
 }  // namespace ObjectIntrospection

tools/OILGen.cpp

@@ -29,7 +29,8 @@ using namespace ObjectIntrospection;
 
 constexpr static OIOpts opts{
     OIOpt{'h', "help", no_argument, nullptr, "Print this message and exit."},
-    OIOpt{'o', "output", required_argument, "<file>", "Write output to file."},
+    OIOpt{'o', "output", required_argument, "<file>",
+          "Write output(s) to file(s) with this prefix."},
     OIOpt{'c', "config-file", required_argument, "<oid.toml>",
           "Path to OI configuration file."},
     OIOpt{'d', "dump-jit", optional_argument, "<jit.cpp>",
@@ -63,6 +64,9 @@ int main(int argc, char* argv[]) {
   while ((c = getopt_long(argc, argv, opts.shortOpts(), opts.longOpts(),
                           nullptr)) != -1) {
     switch (c) {
+      case 'h':
+        usage();
+        return EXIT_SUCCESS;
       case 'o':
         outputPath = optarg;
         break;
@@ -85,7 +89,7 @@ int main(int argc, char* argv[]) {
   fs::path primaryObject = argv[optind];
 
   if ((setenv("DRGN_ENABLE_TYPE_ITERATOR", "1", 1)) < 0) {
-    std::cerr << "Failed to set environment variable\
+    LOG(ERROR) << "Failed to set environment variable\
        DRGN_ENABLE_TYPE_ITERATOR\n";
     exit(EXIT_FAILURE);
   }