Avoid extra cast()s after CStr::as_ptr()

These used to be `&str` literals that did need a pointer cast, but that
became a no-op after switching to `c""` literals in rust-lang#118566.

compiler/rustc_codegen_llvm/src/allocator.rs

@@ -149,7 +149,7 @@ fn create_wrapper_function(
         }
         llvm::LLVMRustSetVisibility(callee, llvm::Visibility::Hidden);
 
-        let llbb = llvm::LLVMAppendBasicBlockInContext(llcx, llfn, c"entry".as_ptr().cast());
+        let llbb = llvm::LLVMAppendBasicBlockInContext(llcx, llfn, c"entry".as_ptr());
 
         let llbuilder = llvm::LLVMCreateBuilderInContext(llcx);
         llvm::LLVMPositionBuilderAtEnd(llbuilder, llbb);

compiler/rustc_codegen_llvm/src/back/lto.rs

@@ -616,7 +616,7 @@ pub(crate) fn run_pass_manager(
             llvm::LLVMRustAddModuleFlagU32(
                 module.module_llvm.llmod(),
                 llvm::LLVMModFlagBehavior::Error,
-                c"LTOPostLink".as_ptr().cast(),
+                c"LTOPostLink".as_ptr(),
                 1,
             );
         }

compiler/rustc_codegen_llvm/src/back/write.rs

@@ -1031,7 +1031,7 @@ unsafe fn embed_bitcode(
             let llglobal = llvm::LLVMAddGlobal(
                 llmod,
                 common::val_ty(llconst),
-                c"rustc.embedded.module".as_ptr().cast(),
+                c"rustc.embedded.module".as_ptr(),
             );
             llvm::LLVMSetInitializer(llglobal, llconst);
 
@@ -1044,7 +1044,7 @@ unsafe fn embed_bitcode(
             let llglobal = llvm::LLVMAddGlobal(
                 llmod,
                 common::val_ty(llconst),
-                c"rustc.embedded.cmdline".as_ptr().cast(),
+                c"rustc.embedded.cmdline".as_ptr(),
             );
             llvm::LLVMSetInitializer(llglobal, llconst);
             let section = if is_apple {
@@ -1054,7 +1054,7 @@ unsafe fn embed_bitcode(
             } else {
                 c".llvmcmd"
             };
-            llvm::LLVMSetSection(llglobal, section.as_ptr().cast());
+            llvm::LLVMSetSection(llglobal, section.as_ptr());
             llvm::LLVMRustSetLinkage(llglobal, llvm::Linkage::PrivateLinkage);
         } else {
             // We need custom section flags, so emit module-level inline assembly.
@@ -1107,7 +1107,7 @@ fn create_msvc_imps(
             .collect::<Vec<_>>();
 
         for (imp_name, val) in globals {
-            let imp = llvm::LLVMAddGlobal(llmod, ptr_ty, imp_name.as_ptr().cast());
+            let imp = llvm::LLVMAddGlobal(llmod, ptr_ty, imp_name.as_ptr());
             llvm::LLVMSetInitializer(imp, val);
             llvm::LLVMRustSetLinkage(imp, llvm::Linkage::ExternalLinkage);
         }

compiler/rustc_codegen_llvm/src/consts.rs

@@ -525,7 +525,7 @@ impl<'ll> CodegenCx<'ll, '_> {
                     let val = llvm::LLVMMetadataAsValue(self.llcx, meta);
                     llvm::LLVMAddNamedMetadataOperand(
                         self.llmod,
-                        c"wasm.custom_sections".as_ptr().cast(),
+                        c"wasm.custom_sections".as_ptr(),
                         val,
                     );
                 }

compiler/rustc_codegen_llvm/src/context.rs

@@ -207,15 +207,15 @@ pub unsafe fn create_module<'ll>(
     // If skipping the PLT is enabled, we need to add some module metadata
     // to ensure intrinsic calls don't use it.
     if !sess.needs_plt() {
-        let avoid_plt = c"RtLibUseGOT".as_ptr().cast();
+        let avoid_plt = c"RtLibUseGOT".as_ptr();
         unsafe {
             llvm::LLVMRustAddModuleFlagU32(llmod, llvm::LLVMModFlagBehavior::Warning, avoid_plt, 1);
         }
     }
 
     // Enable canonical jump tables if CFI is enabled. (See https://reviews.llvm.org/D65629.)
     if sess.is_sanitizer_cfi_canonical_jump_tables_enabled() && sess.is_sanitizer_cfi_enabled() {
-        let canonical_jump_tables = c"CFI Canonical Jump Tables".as_ptr().cast();
+        let canonical_jump_tables = c"CFI Canonical Jump Tables".as_ptr();
         unsafe {
             llvm::LLVMRustAddModuleFlagU32(
                 llmod,
@@ -228,7 +228,7 @@ pub unsafe fn create_module<'ll>(
 
     // Enable LTO unit splitting if specified or if CFI is enabled. (See https://reviews.llvm.org/D53891.)
     if sess.is_split_lto_unit_enabled() || sess.is_sanitizer_cfi_enabled() {
-        let enable_split_lto_unit = c"EnableSplitLTOUnit".as_ptr().cast();
+        let enable_split_lto_unit = c"EnableSplitLTOUnit".as_ptr();
         unsafe {
             llvm::LLVMRustAddModuleFlagU32(
                 llmod,
@@ -241,7 +241,7 @@ pub unsafe fn create_module<'ll>(
 
     // Add "kcfi" module flag if KCFI is enabled. (See https://reviews.llvm.org/D119296.)
     if sess.is_sanitizer_kcfi_enabled() {
-        let kcfi = c"kcfi".as_ptr().cast();
+        let kcfi = c"kcfi".as_ptr();
         unsafe {
             llvm::LLVMRustAddModuleFlagU32(llmod, llvm::LLVMModFlagBehavior::Override, kcfi, 1);
         }
@@ -280,26 +280,26 @@ pub unsafe fn create_module<'ll>(
                 llvm::LLVMRustAddModuleFlagU32(
                     llmod,
                     llvm::LLVMModFlagBehavior::Min,
-                    c"branch-target-enforcement".as_ptr().cast(),
+                    c"branch-target-enforcement".as_ptr(),
                     bti.into(),
                 );
                 llvm::LLVMRustAddModuleFlagU32(
                     llmod,
                     llvm::LLVMModFlagBehavior::Min,
-                    c"sign-return-address".as_ptr().cast(),
+                    c"sign-return-address".as_ptr(),
                     pac_ret.is_some().into(),
                 );
                 let pac_opts = pac_ret.unwrap_or(PacRet { leaf: false, key: PAuthKey::A });
                 llvm::LLVMRustAddModuleFlagU32(
                     llmod,
                     llvm::LLVMModFlagBehavior::Min,
-                    c"sign-return-address-all".as_ptr().cast(),
+                    c"sign-return-address-all".as_ptr(),
                     pac_opts.leaf.into(),
                 );
                 llvm::LLVMRustAddModuleFlagU32(
                     llmod,
                     llvm::LLVMModFlagBehavior::Min,
-                    c"sign-return-address-with-bkey".as_ptr().cast(),
+                    c"sign-return-address-with-bkey".as_ptr(),
                     u32::from(pac_opts.key == PAuthKey::B),
                 );
             }
@@ -317,7 +317,7 @@ pub unsafe fn create_module<'ll>(
             llvm::LLVMRustAddModuleFlagU32(
                 llmod,
                 llvm::LLVMModFlagBehavior::Override,
-                c"cf-protection-branch".as_ptr().cast(),
+                c"cf-protection-branch".as_ptr(),
                 1,
             );
         }
@@ -327,7 +327,7 @@ pub unsafe fn create_module<'ll>(
             llvm::LLVMRustAddModuleFlagU32(
                 llmod,
                 llvm::LLVMModFlagBehavior::Override,
-                c"cf-protection-return".as_ptr().cast(),
+                c"cf-protection-return".as_ptr(),
                 1,
             );
         }
@@ -338,7 +338,7 @@ pub unsafe fn create_module<'ll>(
             llvm::LLVMRustAddModuleFlagU32(
                 llmod,
                 llvm::LLVMModFlagBehavior::Error,
-                c"Virtual Function Elim".as_ptr().cast(),
+                c"Virtual Function Elim".as_ptr(),
                 1,
             );
         }

compiler/rustc_codegen_llvm/src/debuginfo/gdb.rs

@@ -34,8 +34,7 @@ pub fn get_or_insert_gdb_debug_scripts_section_global<'ll>(cx: &CodegenCx<'ll, '
     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()) };
+    let section_var = unsafe { llvm::LLVMGetNamedGlobal(cx.llmod, c_section_var_name.as_ptr()) };
 
     section_var.unwrap_or_else(|| {
         let mut section_contents = Vec::new();
@@ -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, c".debug_gdb_scripts".as_ptr().cast());
+            llvm::LLVMSetSection(section_var, c".debug_gdb_scripts".as_ptr());
             llvm::LLVMSetInitializer(section_var, cx.const_bytes(section_contents));
             llvm::LLVMSetGlobalConstant(section_var, llvm::True);
             llvm::LLVMSetUnnamedAddress(section_var, llvm::UnnamedAddr::Global);

compiler/rustc_codegen_llvm/src/debuginfo/metadata.rs

@@ -952,7 +952,7 @@ pub fn build_compile_unit_di_node<'ll, 'tcx>(
             producer.as_ptr().cast(),
             producer.len(),
             tcx.sess.opts.optimize != config::OptLevel::No,
-            c"".as_ptr().cast(),
+            c"".as_ptr(),
             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

compiler/rustc_codegen_llvm/src/debuginfo/mod.rs

@@ -109,15 +109,15 @@ impl<'ll, 'tcx> CodegenUnitDebugContext<'ll, 'tcx> {
                 llvm::LLVMRustAddModuleFlagU32(
                     self.llmod,
                     llvm::LLVMModFlagBehavior::Warning,
-                    c"Dwarf Version".as_ptr().cast(),
+                    c"Dwarf Version".as_ptr(),
                     dwarf_version,
                 );
             } else {
                 // Indicate that we want CodeView debug information on MSVC
                 llvm::LLVMRustAddModuleFlagU32(
                     self.llmod,
                     llvm::LLVMModFlagBehavior::Warning,
-                    c"CodeView".as_ptr().cast(),
+                    c"CodeView".as_ptr(),
                     1,
                 )
             }
@@ -126,7 +126,7 @@ impl<'ll, 'tcx> CodegenUnitDebugContext<'ll, 'tcx> {
             llvm::LLVMRustAddModuleFlagU32(
                 self.llmod,
                 llvm::LLVMModFlagBehavior::Warning,
-                c"Debug Info Version".as_ptr().cast(),
+                c"Debug Info Version".as_ptr(),
                 llvm::LLVMRustDebugMetadataVersion(),
             );
         }

library/std/src/sys/pal/unix/mod.rs

@@ -116,7 +116,7 @@ pub unsafe fn init(argc: isize, argv: *const *const u8, sigpipe: u8) {
                 if pfd.revents & libc::POLLNVAL == 0 {
                     continue;
                 }
-                if open64(c"/dev/null".as_ptr().cast(), libc::O_RDWR, 0) == -1 {
+                if open64(c"/dev/null".as_ptr(), libc::O_RDWR, 0) == -1 {
                     // If the stream is closed but we failed to reopen it, abort the
                     // process. Otherwise we wouldn't preserve the safety of
                     // operations on the corresponding Rust object Stdin, Stdout, or
@@ -147,7 +147,7 @@ pub unsafe fn init(argc: isize, argv: *const *const u8, sigpipe: u8) {
             use crate::sys::os::errno;
             for fd in 0..3 {
                 if libc::fcntl(fd, libc::F_GETFD) == -1 && errno() == libc::EBADF {
-                    if open64(c"/dev/null".as_ptr().cast(), libc::O_RDWR, 0) == -1 {
+                    if open64(c"/dev/null".as_ptr(), libc::O_RDWR, 0) == -1 {
                         // If the stream is closed but we failed to reopen it, abort the
                         // process. Otherwise we wouldn't preserve the safety of
                         // operations on the corresponding Rust object Stdin, Stdout, or