[lldb] Support overriding the disassembly CPU & features (#115382)

Add the ability to override the disassembly CPU and CPU features through
a target setting (`target.disassembly-cpu` and
`target.disassembly-features`) and a `disassemble` command option
(`--cpu` and `--features`).

This is especially relevant for architectures like RISC-V which relies
heavily on CPU extensions.

The majority of this patch is plumbing the options through. I recommend
looking at DisassemblerLLVMC and the test for the observable change in
behavior.

1 files changed, 14 insertions, 0 deletions

diff --git a/lldb/source/Target/Target.cpp b/lldb/source/Target/Target.cpp
index 242d2eaec2a1..a788bad88b29 100644
--- a/lldb/source/Target/Target.cpp
+++ b/lldb/source/Target/Target.cpp
@@ -4490,6 +4490,20 @@ const char *TargetProperties::GetDisassemblyFlavor() const {
   return return_value;
 }
 
+const char *TargetProperties::GetDisassemblyCPU() const {
+  const uint32_t idx = ePropertyDisassemblyCPU;
+  llvm::StringRef str = GetPropertyAtIndexAs<llvm::StringRef>(
+      idx, g_target_properties[idx].default_cstr_value);
+  return str.empty() ? nullptr : str.data();
+}
+
+const char *TargetProperties::GetDisassemblyFeatures() const {
+  const uint32_t idx = ePropertyDisassemblyFeatures;
+  llvm::StringRef str = GetPropertyAtIndexAs<llvm::StringRef>(
+      idx, g_target_properties[idx].default_cstr_value);
+  return str.empty() ? nullptr : str.data();
+}
+
 InlineStrategy TargetProperties::GetInlineStrategy() const {
   const uint32_t idx = ePropertyInlineStrategy;
   return GetPropertyAtIndexAs<InlineStrategy>(