[lldb] Implement ${target.file} format variable (llvm#123431)

Implements a format variable to print the basename and full path to the
current target.

(cherry picked from commit 06c54bc)

Author: JDevlieghere

lldb/docs/use/formatting.rst

@@ -113,11 +113,11 @@ A complete list of currently supported format string variables is listed below:
 +---------------------------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
 | ``module.file.basename``                          | The basename of the current module (shared library or executable)                                                                                                                                                                                                                           |
 +---------------------------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
-| ``module.file.fullpath``                          | The basename of the current module (shared library or executable)                                                                                                                                                                                                                           |
+| ``module.file.fullpath``                          | The path of the current module (shared library or executable)                                                                                                                                                                                                                               |
 +---------------------------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
 | ``process.file.basename``                         | The basename of the file for the process                                                                                                                                                                                                                                                    |
 +---------------------------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
-| ``process.file.fullpath``                         | The fullname of the file for the process                                                                                                                                                                                                                                                    |
+| ``process.file.fullpath``                         | The path of the file for the process                                                                                                                                                                                                                                                        |
 +---------------------------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
 | ``process.id``                                    | The process ID native to the system on which the inferior runs.                                                                                                                                                                                                                             |
 +---------------------------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
@@ -141,6 +141,10 @@ A complete list of currently supported format string variables is listed below:
 +---------------------------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
 | ``target.arch``                                   | The architecture of the current target                                                                                                                                                                                                                                                      |
 +---------------------------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+| ``target.file.basename``                          | The basename of the current target                                                                                                                                                                                                                                                          |
++---------------------------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
+| ``target.file.fullpath``                          | The path of the current target                                                                                                                                                                                                                                                              |
++---------------------------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
 | ``script.target:python_func``                     | Use a Python function to generate a piece of textual output                                                                                                                                                                                                                                 |
 +---------------------------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
 | ``script.process:python_func``                    | Use a Python function to generate a piece of textual output                                                                                                                                                                                                                                 |

lldb/include/lldb/Core/FormatEntity.h

@@ -67,6 +67,7 @@ struct Entry {
     ScriptThread,
     ThreadInfo,
     TargetArch,
+    TargetFile,
     ScriptTarget,
     ModuleFile,
     File,

lldb/source/Core/FormatEntity.cpp

@@ -162,7 +162,9 @@ constexpr Definition g_thread_child_entries[] = {
     Definition("completed-expression", EntryType::ThreadCompletedExpression)};
 
 constexpr Definition g_target_child_entries[] = {
-    Definition("arch", EntryType::TargetArch)};
+    Definition("arch", EntryType::TargetArch),
+    Entry::DefinitionWithChildren("file", EntryType::TargetFile,
+                                  g_file_child_entries)};
 
 constexpr Definition g_progress_child_entries[] = {
     Definition("count", EntryType::ProgressCount),
@@ -329,6 +331,7 @@ const char *FormatEntity::Entry::TypeToCString(Type t) {
     ENUM_TO_CSTR(ScriptThread);
     ENUM_TO_CSTR(ThreadInfo);
     ENUM_TO_CSTR(TargetArch);
+    ENUM_TO_CSTR(TargetFile);
     ENUM_TO_CSTR(ScriptTarget);
     ENUM_TO_CSTR(ModuleFile);
     ENUM_TO_CSTR(File);
@@ -1484,6 +1487,17 @@ bool FormatEntity::Format(const Entry &entry, Stream &s,
     }
     return false;
 
+  case Entry::Type::TargetFile:
+    if (exe_ctx) {
+      if (Target *target = exe_ctx->GetTargetPtr()) {
+        if (Module *exe_module = target->GetExecutableModulePointer()) {
+          if (DumpFile(s, exe_module->GetFileSpec(), (FileKind)entry.number))
+            return true;
+        }
+      }
+    }
+    return false;
+
   case Entry::Type::ScriptTarget:
     if (exe_ctx) {
       Target *target = exe_ctx->GetTargetPtr();

lldb/unittests/Core/FormatEntityTest.cpp

@@ -148,6 +148,9 @@ constexpr llvm::StringRef lookupStrings[] = {
     "${thread.return-value}",
     "${thread.completed-expression}",
     "${target.arch}",
+    "${target.file.basename}",
+    "${target.file.dirname}",
+    "${target.file.fullpath}",
     "${var.dummy-var-to-test-wildcard}"};
 
 TEST(FormatEntity, LookupAllEntriesInTree) {