Auto merge of #118566 - klensy:cstr-new, r=WaffleLapkin

use c literals in compiler and library

Relands refreshed https://github.com/rust-lang/rust/pull/111647

3 files changed, 8 insertions, 13 deletions

diff --git a/compiler/rustc_codegen_llvm/src/debuginfo/gdb.rs b/compiler/rustc_codegen_llvm/src/debuginfo/gdb.rs
index 425e935bc9f..d82b1e1e721 100644
--- a/compiler/rustc_codegen_llvm/src/debuginfo/gdb.rs
+++ b/compiler/rustc_codegen_llvm/src/debuginfo/gdb.rs
@@ -30,14 +30,13 @@ pub fn insert_reference_to_gdb_debug_scripts_section_global(bx: &mut Builder<'_,
 /// Allocates the global variable responsible for the .debug_gdb_scripts binary
 /// section.
 pub fn get_or_insert_gdb_debug_scripts_section_global<'ll>(cx: &CodegenCx<'ll, '_>) -> &'ll Value {
-    let c_section_var_name = "__rustc_debug_gdb_scripts_section__\0";
-    let section_var_name = &c_section_var_name[..c_section_var_name.len() - 1];
+    let c_section_var_name = c"__rustc_debug_gdb_scripts_section__";
+    let section_var_name = c_section_var_name.to_str().unwrap();
 
     let section_var =
         unsafe { llvm::LLVMGetNamedGlobal(cx.llmod, c_section_var_name.as_ptr().cast()) };
 
     section_var.unwrap_or_else(|| {
-        let section_name = b".debug_gdb_scripts\0";
         let mut section_contents = Vec::new();
 
         // Add the pretty printers for the standard library first.
@@ -70,7 +69,7 @@ pub fn get_or_insert_gdb_debug_scripts_section_global<'ll>(cx: &CodegenCx<'ll, '
             let section_var = cx
                 .define_global(section_var_name, llvm_type)
                 .unwrap_or_else(|| bug!("symbol `{}` is already defined", section_var_name));
-            llvm::LLVMSetSection(section_var, section_name.as_ptr().cast());
+            llvm::LLVMSetSection(section_var, c".debug_gdb_scripts".as_ptr().cast());
             llvm::LLVMSetInitializer(section_var, cx.const_bytes(section_contents));
             llvm::LLVMSetGlobalConstant(section_var, llvm::True);
             llvm::LLVMSetUnnamedAddress(section_var, llvm::UnnamedAddr::Global);
diff --git a/compiler/rustc_codegen_llvm/src/debuginfo/metadata.rs b/compiler/rustc_codegen_llvm/src/debuginfo/metadata.rs
index acd5a1ff5c6..7968f238b40 100644
--- a/compiler/rustc_codegen_llvm/src/debuginfo/metadata.rs
+++ b/compiler/rustc_codegen_llvm/src/debuginfo/metadata.rs
@@ -21,7 +21,6 @@ use crate::llvm::debuginfo::{
 };
 use crate::value::Value;
 
-use cstr::cstr;
 use rustc_codegen_ssa::debuginfo::type_names::cpp_like_debuginfo;
 use rustc_codegen_ssa::debuginfo::type_names::VTableNameKind;
 use rustc_codegen_ssa::traits::*;
@@ -856,7 +855,6 @@ pub fn build_compile_unit_di_node<'ll, 'tcx>(
     use rustc_session::RemapFileNameExt;
     let name_in_debuginfo = name_in_debuginfo.to_string_lossy();
     let work_dir = tcx.sess.opts.working_dir.for_codegen(tcx.sess).to_string_lossy();
-    let flags = "\0";
     let output_filenames = tcx.output_filenames(());
     let split_name = if tcx.sess.target_can_use_split_dwarf() {
         output_filenames
@@ -910,7 +908,7 @@ pub fn build_compile_unit_di_node<'ll, 'tcx>(
             producer.as_ptr().cast(),
             producer.len(),
             tcx.sess.opts.optimize != config::OptLevel::No,
-            flags.as_ptr().cast(),
+            c"".as_ptr().cast(),
             0,
             // NB: this doesn't actually have any perceptible effect, it seems. LLVM will instead
             // put the path supplied to `MCSplitDwarfFile` into the debug info of the final
@@ -940,8 +938,7 @@ pub fn build_compile_unit_di_node<'ll, 'tcx>(
             );
             let val = llvm::LLVMMetadataAsValue(debug_context.llcontext, gcov_metadata);
 
-            let llvm_gcov_ident = cstr!("llvm.gcov");
-            llvm::LLVMAddNamedMetadataOperand(debug_context.llmod, llvm_gcov_ident.as_ptr(), val);
+            llvm::LLVMAddNamedMetadataOperand(debug_context.llmod, c"llvm.gcov".as_ptr(), val);
         }
 
         return unit_metadata;
diff --git a/compiler/rustc_codegen_llvm/src/debuginfo/mod.rs b/compiler/rustc_codegen_llvm/src/debuginfo/mod.rs
index a0ae1e9bf5d..31631e8a864 100644
--- a/compiler/rustc_codegen_llvm/src/debuginfo/mod.rs
+++ b/compiler/rustc_codegen_llvm/src/debuginfo/mod.rs
@@ -112,7 +112,7 @@ impl<'ll, 'tcx> CodegenUnitDebugContext<'ll, 'tcx> {
                 llvm::LLVMRustAddModuleFlag(
                     self.llmod,
                     llvm::LLVMModFlagBehavior::Warning,
-                    "Dwarf Version\0".as_ptr().cast(),
+                    c"Dwarf Version".as_ptr().cast(),
                     dwarf_version,
                 );
             } else {
@@ -120,17 +120,16 @@ impl<'ll, 'tcx> CodegenUnitDebugContext<'ll, 'tcx> {
                 llvm::LLVMRustAddModuleFlag(
                     self.llmod,
                     llvm::LLVMModFlagBehavior::Warning,
-                    "CodeView\0".as_ptr().cast(),
+                    c"CodeView".as_ptr().cast(),
                     1,
                 )
             }
 
             // Prevent bitcode readers from deleting the debug info.
-            let ptr = "Debug Info Version\0".as_ptr();
             llvm::LLVMRustAddModuleFlag(
                 self.llmod,
                 llvm::LLVMModFlagBehavior::Warning,
-                ptr.cast(),
+                c"Debug Info Version".as_ptr().cast(),
                 llvm::LLVMRustDebugMetadataVersion(),
             );
         }