From 598bd00e979376c0d9374bc82a0200cc79f6a9b5 Mon Sep 17 00:00:00 2001
From: csmoe <csmoe@msn.com>
Date: Sun, 20 Feb 2022 20:33:48 +0800
Subject: [PATCH] cherry-pick from @tromey: do not emit .debug_pubnames
 .debug_pubtypes on linux

---
 compiler/rustc_codegen_llvm/src/llvm/ffi.rs   | 23 +++++++++++++++-
 .../rustc_llvm/llvm-wrapper/RustWrapper.cpp   | 26 +++++++++++++++++--
 compiler/rustc_session/src/config.rs          |  7 +++++
 compiler/rustc_session/src/options.rs         | 17 ++++++++++++
 4 files changed, 70 insertions(+), 3 deletions(-)

diff --git a/compiler/rustc_codegen_llvm/src/llvm/ffi.rs b/compiler/rustc_codegen_llvm/src/llvm/ffi.rs
index a1c7d2b4f6156..a5075a5b3aaf5 100644
--- a/compiler/rustc_codegen_llvm/src/llvm/ffi.rs
+++ b/compiler/rustc_codegen_llvm/src/llvm/ffi.rs
@@ -7,7 +7,7 @@ use super::debuginfo::{
     DIArray, DIBasicType, DIBuilder, DICompositeType, DIDerivedType, DIDescriptor, DIEnumerator,
     DIFile, DIFlags, DIGlobalVariableExpression, DILexicalBlock, DILocation, DINameSpace,
     DISPFlags, DIScope, DISubprogram, DISubrange, DITemplateTypeParameter, DIType, DIVariable,
-    DebugEmissionKind,
+    DebugEmissionKind, DebugNameTableKind,
 };
 
 use libc::{c_char, c_int, c_uint, size_t};
@@ -955,6 +955,26 @@ pub mod debuginfo {
             }
         }
     }
+
+    /// LLVMRustDebugNameTableKind
+    #[derive(Clone, Copy)]
+    #[repr(C)]
+    pub enum DebugNameTableKind {
+        Default,
+        None,
+        Gnu,
+    }
+
+    impl DebugNameTableKind {
+        pub fn from_generic(kind: rustc_session::config::DebugNameTableKind) -> DebugNameTableKind {
+            use rustc_session::config;
+            match kind {
+                config::DebugNameTableKind::None => DebugNameTableKind::None,
+                config::DebugNameTableKind::Default => DebugNameTableKind::Default,
+                config::DebugNameTableKind::Gnu => DebugNameTableKind::Gnu,
+            }
+        }
+    }
 }
 
 extern "C" {
@@ -1919,6 +1939,7 @@ extern "C" {
         kind: DebugEmissionKind,
         DWOId: u64,
         SplitDebugInlining: bool,
+        DebugNameTableKind: DebugNameTableKind,
     ) -> &'a DIDescriptor;
 
     pub fn LLVMRustDIBuilderCreateFile<'a>(
diff --git a/compiler/rustc_llvm/llvm-wrapper/RustWrapper.cpp b/compiler/rustc_llvm/llvm-wrapper/RustWrapper.cpp
index c21e4acbefec0..1eab00dabed6d 100644
--- a/compiler/rustc_llvm/llvm-wrapper/RustWrapper.cpp
+++ b/compiler/rustc_llvm/llvm-wrapper/RustWrapper.cpp
@@ -682,6 +682,25 @@ static DICompileUnit::DebugEmissionKind fromRust(LLVMRustDebugEmissionKind Kind)
   }
 }
 
+enum class LLVMRustDebugNameTableKind {
+    Default,
+    None,
+    Gnu,
+};
+
+static DICompileUnit::DebugNameTableKind fromRust(LLVMRustDebugNameTableKind Kind) {
+  switch (Kind) {
+  case LLVMRustDebugNameTableKind::Default:
+    return DICompileUnit::DebugNameTableKind::Default;
+  case LLVMRustDebugNameTableKind::None:
+    return DICompileUnit::DebugNameTableKind::None;
+  case LLVMRustDebugNameTableKind::Gnu:
+    return DICompileUnit::DebugNameTableKind::Gnu;
+  default:
+    report_fatal_error("bad DebugNameTableKind.");
+  }
+}
+
 enum class LLVMRustChecksumKind {
   None,
   MD5,
@@ -749,13 +768,16 @@ extern "C" LLVMMetadataRef LLVMRustDIBuilderCreateCompileUnit(
     const char *Flags, unsigned RuntimeVer,
     const char *SplitName, size_t SplitNameLen,
     LLVMRustDebugEmissionKind Kind,
-    uint64_t DWOId, bool SplitDebugInlining) {
+    uint64_t DWOId, bool SplitDebugInlining,
+    LLVMRustDebugNameTableKind TableKind) {
   auto *File = unwrapDI<DIFile>(FileRef);
+  bool DebugInfoForProfiling = false;
 
   return wrap(Builder->createCompileUnit(Lang, File, StringRef(Producer, ProducerLen),
                                          isOptimized, Flags, RuntimeVer,
                                          StringRef(SplitName, SplitNameLen),
-                                         fromRust(Kind), DWOId, SplitDebugInlining));
+                                         fromRust(Kind), DWOId, SplitDebugInlining,
+                                         DebugInfoForProfiling, fromRust(TableKind));
 }
 
 extern "C" LLVMMetadataRef LLVMRustDIBuilderCreateFile(
diff --git a/compiler/rustc_session/src/config.rs b/compiler/rustc_session/src/config.rs
index 92ad0723f4879..8f34761bc02a8 100644
--- a/compiler/rustc_session/src/config.rs
+++ b/compiler/rustc_session/src/config.rs
@@ -231,6 +231,13 @@ pub enum DebugInfo {
     Full,
 }
 
+#[derive(Clone, Copy, Debug, PartialEq, Hash)]
+pub enum DebugNameTableKind {
+    Default,
+    None,
+    Gnu,
+}
+
 /// Split debug-information is enabled by `-C split-debuginfo`, this enum is only used if split
 /// debug-information is enabled (in either `Packed` or `Unpacked` modes), and the platform
 /// uses DWARF for debug-information.
diff --git a/compiler/rustc_session/src/options.rs b/compiler/rustc_session/src/options.rs
index e7ab8fffdf35c..5cb27a281e9af 100644
--- a/compiler/rustc_session/src/options.rs
+++ b/compiler/rustc_session/src/options.rs
@@ -811,6 +811,21 @@ mod parse {
         }
     }
 
+    crate fn parse_debug_name_table_kind(slot: &mut DebugNameTableKind, v: Option<&str>) -> bool {
+        match v {
+            None => false,
+            Some(s) => {
+                *slot = match s {
+                    "none" => DebugNameTableKind::None,
+                    "gnu" => DebugNameTableKind::Gnu,
+                    _ => DebugNameTableKind::Default,
+                };
+                true
+            }
+            _ => false,
+        }
+    }
+
     crate fn parse_lto(slot: &mut LtoCli, v: Option<&str>) -> bool {
         if v.is_some() {
             let mut bool_arg = None;
@@ -1151,6 +1166,8 @@ options! {
         "inject the given attribute in the crate"),
     debug_info_for_profiling: bool = (false, parse_bool, [TRACKED],
         "emit discriminators and other data necessary for AutoFDO"),
+    debug_name_table_kind: DebugNameTableKind = (DebugNameTableKind::Default, parse_debug_name_table_kind, [TRACKED],
+        "emit .debug_pubnames .debug_pubtypes(default: default)"),
     debug_macros: bool = (false, parse_bool, [TRACKED],
         "emit line numbers debug info inside macros (default: no)"),
     deduplicate_diagnostics: bool = (true, parse_bool, [UNTRACKED],