Options refactor.

Signed-off-by: fruffy <fruffy@nyu.edu>

backends/p4tools/common/compiler/compiler_target.cpp

@@ -1,9 +1,7 @@
 #include "backends/p4tools/common/compiler/compiler_target.h"
 
 #include <string>
-#include <vector>
 
-#include "backends/p4tools/common/compiler/context.h"
 #include "backends/p4tools/common/compiler/midend.h"
 #include "backends/p4tools/common/core/target.h"
 #include "frontends/common/applyOptionsPragmas.h"
@@ -16,15 +14,6 @@
 
 namespace P4Tools {
 
-ICompileContext *CompilerTarget::makeContext(std::string_view toolName) {
-    return get(toolName).makeContextImpl();
-}
-
-std::vector<const char *> *CompilerTarget::initCompiler(std::string_view toolName, int argc,
-                                                        char **argv) {
-    return get(toolName).initCompilerImpl(argc, argv);
-}
-
 CompilerResultOrError CompilerTarget::runCompiler(const CompilerOptions &options,
                                                   std::string_view toolName) {
     const auto *program = P4Tools::CompilerTarget::runParser(options);
@@ -67,15 +56,6 @@ CompilerResultOrError CompilerTarget::runCompilerImpl(const CompilerOptions &opt
     return *new CompilerResult(*program);
 }
 
-ICompileContext *CompilerTarget::makeContextImpl() const {
-    return new CompileContext<CompilerOptions>();
-}
-
-std::vector<const char *> *CompilerTarget::initCompilerImpl(int argc, char **argv) const {
-    auto *result = CompileContext<CompilerOptions>::get().options().process(argc, argv);
-    return ::errorCount() > 0 ? nullptr : result;
-}
-
 const IR::P4Program *CompilerTarget::runParser(const ParserOptions &options) {
     const auto *program = P4::parseP4File(options);
     if (::errorCount() > 0) {

backends/p4tools/common/compiler/compiler_target.h

@@ -2,7 +2,6 @@
 #define BACKENDS_P4TOOLS_COMMON_COMPILER_COMPILER_TARGET_H_
 
 #include <string>
-#include <vector>
 
 #include "backends/p4tools/common/compiler/compiler_result.h"
 #include "backends/p4tools/common/compiler/context.h"
@@ -19,15 +18,6 @@ namespace P4Tools {
 /// Encapsulates the details of invoking the P4 compiler for a target device and architecture.
 class CompilerTarget : public Target {
  public:
-    /// @returns a new compilation context for the compiler.
-    static ICompileContext *makeContext(std::string_view toolName);
-
-    /// Initializes the P4 compiler with the given compiler-specific command-line arguments.
-    ///
-    /// @returns any unprocessed arguments, or nullptr if there was an error.
-    static std::vector<const char *> *initCompiler(std::string_view toolName, int argc,
-                                                   char **argv);
-
     /// Runs the P4 compiler to produce an IR and various other kinds of information on the input
     /// program.
     ///
@@ -49,18 +39,10 @@ class CompilerTarget : public Target {
                                              std::string_view toolName, const IR::P4Program *);
 
  protected:
-    /// @see @makeContext.
-    [[nodiscard]] virtual ICompileContext *makeContextImpl() const;
-
     /// @see runCompiler.
     virtual CompilerResultOrError runCompilerImpl(const CompilerOptions &options,
                                                   const IR::P4Program *) const;
 
-    /// This implementation just forwards the given arguments to the compiler.
-    ///
-    /// @see @initCompiler.
-    virtual std::vector<const char *> *initCompilerImpl(int argc, char **argv) const;
-
     /// Parses the P4 program specified on the command line.
     ///
     /// @returns nullptr if an error occurs during parsing.

backends/p4tools/common/compiler/context.h

@@ -2,7 +2,7 @@
 #define BACKENDS_P4TOOLS_COMMON_COMPILER_CONTEXT_H_
 
 #include "backends/p4tools/common/compiler/configuration.h"
-#include "frontends/common/options.h"
+#include "frontends/common/parser_options.h"
 
 namespace P4Tools {
 
@@ -18,17 +18,17 @@ class CompileContext : public virtual P4CContext {
 
     template <typename OptionsDerivedType>
     explicit CompileContext(CompileContext<OptionsDerivedType> &context)
-        : optionsInstance(context.options()) {}
+        : _optionsInstance(context.options()) {}
 
     /// @return the compiler options for this compilation context.
-    OptionsType &options() override { return optionsInstance; }
+    OptionsType &options() override { return _optionsInstance; }
 
  protected:
     const CompilerConfiguration &getConfigImpl() override { return CompilerConfiguration::get(); }
 
  private:
     /// The compiler options for this compilation context.
-    OptionsType optionsInstance;
+    OptionsType _optionsInstance;
 };
 
 }  // namespace P4Tools

backends/p4tools/common/core/target.cpp

@@ -6,15 +6,14 @@
 #include <map>
 #include <optional>
 #include <string>
-#include <utility>
 
 #include "backends/p4tools/common/lib/variables.h"
 #include "ir/irutils.h"
 
 namespace P4Tools {
 
-Target::Spec::Spec(std::string deviceName, std::string archName)
-    : deviceName(std::move(deviceName)), archName(std::move(archName)) {
+Target::Spec::Spec(std::string_view deviceName, std::string_view archName)
+    : deviceName(deviceName), archName(archName) {
     // Convert names to lower case.
     std::transform(this->archName.begin(), this->archName.end(), this->archName.begin(), ::tolower);
     std::transform(this->deviceName.begin(), this->deviceName.end(), this->deviceName.begin(),
@@ -37,8 +36,8 @@ std::map<Target::Spec, std::map<std::string, const Target *, std::less<>>> Targe
 std::map<std::string, std::string, std::less<>> Target::defaultArchByDevice = {};
 std::map<std::string, std::string, std::less<>> Target::defaultDeviceByArch = {};
 
-bool Target::init(std::string deviceName, std::string archName) {
-    Spec spec(std::move(deviceName), std::move(archName));
+bool Target::init(std::string_view deviceName, std::string_view archName) {
+    Spec spec(deviceName, archName);
 
     if (registry.count(spec) != 0U) {
         curTarget = spec;
@@ -48,23 +47,95 @@ bool Target::init(std::string deviceName, std::string archName) {
     return false;
 }
 
-bool Target::setDevice(std::string deviceName) {
-    std::transform(deviceName.begin(), deviceName.end(), deviceName.begin(), ::tolower);
-    if (defaultArchByDevice.count(deviceName) == 0U) {
+std::optional<ICompileContext *> Target::initializeTarget(std::string_view toolName,
+                                                          std::string_view target,
+                                                          std::string_view arch) {
+    // Establish a dummy compilation context so that we can use ::error to report errors while
+    // processing target and arch.
+    class DummyCompileContext : public BaseCompileContext {
+    } dummyContext;
+    AutoCompileContext autoDummyContext(&dummyContext);
+    if (!P4Tools::Target::setDevice(target)) {
+        ::error("Unsupported device: %s", target);
+        return std::nullopt;
+    }
+    if (!P4Tools::Target::setArch(arch)) {
+        ::error("Unsupported architecture: %s", arch);
+        return std::nullopt;
+    }
+    const auto &instances = registry.at(*curTarget);
+    auto instance = instances.find(toolName);
+    BUG_CHECK(instance != instances.end(), "Architecture %1% on device %2% not supported for %3%",
+              curTarget->archName, curTarget->deviceName, toolName);
+
+    return instance->second->makeContext();
+}
+
+std::optional<ICompileContext *> Target::initializeTarget(std::string_view toolName,
+                                                          const std::vector<const char *> &args) {
+    // Establish a dummy compilation context so that we can use ::error to report errors while
+    // processing target and arch.
+    class DummyCompileContext : public BaseCompileContext {
+    } dummyContext;
+    AutoCompileContext autoDummyContext(&dummyContext);
+    if (args.size() < 3) {
+        ::error("Missing --target and --arch arguments");
+        return std::nullopt;
+    }
+    std::optional<std::string> target;
+    std::optional<std::string> arch;
+    // Loop through arguments (skip the program name)
+    for (size_t i = 1; i < args.size(); ++i) {
+        const std::string &arg = args[i];
+        if (arg == "--arch") {
+            if (i + 1 < args.size()) {
+                arch = args[i + 1];
+            } else {
+                ::error("Missing architecture name after --arch");
+                return std::nullopt;
+            }
+        }
+        if (arg == "--target") {
+            if (i + 1 < args.size()) {
+                target = args[i + 1];
+            } else {
+                ::error("Missing device name after --target");
+                return std::nullopt;
+            }
+        }
+    }
+    if (!target) {
+        ::error("Missing --target argument");
+        return std::nullopt;
+    }
+    if (!arch) {
+        ::error("Missing --arch argument");
+        return std::nullopt;
+    }
+    return initializeTarget(toolName, target.value(), arch.value());
+}
+
+bool Target::setDevice(std::string_view deviceName) {
+    std::string lowerCaseDeviceName(deviceName);
+    std::transform(lowerCaseDeviceName.begin(), lowerCaseDeviceName.end(),
+                   lowerCaseDeviceName.begin(), ::tolower);
+    if (defaultArchByDevice.count(lowerCaseDeviceName) == 0U) {
         return false;
     }
 
-    auto archName = curTarget ? curTarget->archName : defaultArchByDevice.at(deviceName);
+    auto archName = curTarget ? curTarget->archName : defaultArchByDevice.at(deviceName.data());
     return init(deviceName, archName);
 }
 
-bool Target::setArch(std::string archName) {
-    std::transform(archName.begin(), archName.end(), archName.begin(), ::tolower);
-    if (defaultDeviceByArch.count(archName) == 0U) {
+bool Target::setArch(std::string_view archName) {
+    std::string lowerCaseArchName(archName);
+    std::transform(lowerCaseArchName.begin(), lowerCaseArchName.end(), lowerCaseArchName.begin(),
+                   ::tolower);
+    if (defaultDeviceByArch.count(lowerCaseArchName) == 0U) {
         return false;
     }
 
-    auto deviceName = curTarget ? curTarget->deviceName : defaultDeviceByArch.at(archName);
+    auto deviceName = curTarget ? curTarget->deviceName : defaultDeviceByArch.at(archName.data());
     return init(deviceName, archName);
 }
 
@@ -92,5 +163,4 @@ Target::Target(std::string_view toolName, const std::string &deviceName,
         defaultArchByDevice[spec.deviceName] = spec.archName;
     }
 }
-
 }  // namespace P4Tools

backends/p4tools/common/core/target.h

@@ -1,11 +1,13 @@
 #ifndef BACKENDS_P4TOOLS_COMMON_CORE_TARGET_H_
 #define BACKENDS_P4TOOLS_COMMON_CORE_TARGET_H_
 
+#include <cstdlib>
 #include <map>
 #include <optional>
 #include <string>
 
 #include "ir/ir.h"
+#include "lib/compile_context.h"
 #include "lib/exceptions.h"
 
 namespace P4Tools {
@@ -22,7 +24,7 @@ class Target {
         std::string archName;
 
         /// Names provided to this constructor are converted to lower case.
-        Spec(std::string deviceName, std::string archName);
+        Spec(std::string_view deviceName, std::string_view archName);
 
         /// Lexicographic ordering on (deviceName, archName).
         bool operator<(const Spec &) const;
@@ -32,23 +34,23 @@ class Target {
     ///
     /// @returns true on success. If initialization fails, false is returned, and nothing is
     /// changed.
-    static bool init(std::string deviceName, std::string archName);
+    static bool init(std::string_view deviceName, std::string_view archName);
 
     /// Initializes the global target device to @deviceName without changing the architecture. If
     /// no architecture was previously selected, then the first architecture registered for the
     /// device is chosen.
     ///
     /// @returns true on success. If initialization fails, false is returned, and nothing is
     /// changed.
-    static bool setDevice(std::string deviceName);
+    static bool setDevice(std::string_view deviceName);
 
     /// Initializes the global target architecture to @archName without changing the device. If no
     /// device was previously selected, then the first device registered for the architecture is
     /// chosen.
     ///
     /// @returns true on success. If initialization fails, false is returned, and nothing is
     /// changed.
-    static bool setArch(std::string archName);
+    static bool setArch(std::string_view archName);
 
     /// The name of the tool supported by this instance.
     std::string toolName;
@@ -67,11 +69,22 @@ class Target {
     virtual const IR::Expression *createTargetUninitialized(const IR::Type *type,
                                                             bool forceTaint) const;
 
+    /// Initializes the global target device and architecture to @deviceName and @archName.
+    /// Returns 0 on success. If initialization fails, returns -1.
+    static std::optional<ICompileContext *> initializeTarget(std::string_view toolName,
+                                                             const std::vector<const char *> &args);
+    static std::optional<ICompileContext *> initializeTarget(std::string_view toolName,
+                                                             std::string_view target,
+                                                             std::string_view arch);
+
  protected:
     /// Creates and registers a new Target instance for the given @toolName, @deviceName, and
     /// @archName.
     Target(std::string_view toolName, const std::string &deviceName, const std::string &archName);
 
+    /// @returns a new compilation context for the compiler.
+    [[nodiscard]] virtual ICompileContext *makeContext() const = 0;
+
     /// @returns the target instance for the given tool and active target, as selected by @init.
     //
     // Implemented here because of limitations of templates.