Revert "Provide a way of accessing the ThinLTO module import map in rustc."

This reverts commit 9df56ca0ee.

src/librustc_codegen_llvm/back/lto.rs

@@ -20,13 +20,12 @@ use rustc::hir::def_id::LOCAL_CRATE;
 use rustc::middle::exported_symbols::SymbolExportLevel;
 use rustc::session::config::{self, Lto};
 use rustc::util::common::time_ext;
-use rustc_data_structures::fx::FxHashMap;
 use time_graph::Timeline;
 use {ModuleCodegen, ModuleLlvm, ModuleKind, ModuleSource};
 
 use libc;
 
-use std::ffi::{CString, CStr};
+use std::ffi::CString;
 use std::ptr;
 use std::slice;
 use std::sync::Arc;
@@ -777,69 +776,3 @@ impl ThinModule {
         Ok(module)
     }
 }
-
-
-#[derive(Debug)]
-pub struct ThinLTOImports {
-    // key = llvm name of importing module, value = list of modules it imports from
-    imports: FxHashMap<String, Vec<String>>,
-}
-
-impl ThinLTOImports {
-
-    /// Load the ThinLTO import map from ThinLTOData.
-    unsafe fn from_thin_lto_data(data: *const llvm::ThinLTOData) -> ThinLTOImports {
-        let raw_data: *const llvm::ThinLTOModuleImports =
-            llvm::LLVMRustGetThinLTOModuleImports(data);
-
-        assert!(!raw_data.is_null());
-
-        let mut imports = FxHashMap();
-        let mut module_ptr = raw_data;
-        let mut module_index = 0;
-
-        loop {
-            let mut entry_ptr: *const llvm::ThinLTOModuleName = *module_ptr;
-
-            if entry_ptr.is_null() {
-                break;
-            }
-
-            let importing_module_name = CStr::from_ptr(*entry_ptr)
-                .to_str()
-                .expect("Non-utf8 LLVM module name encountered")
-                .to_owned();
-
-            entry_ptr = entry_ptr.offset(1);
-
-            let mut imported_modules = vec![];
-
-            loop {
-                let imported_module_name = *entry_ptr;
-
-                if imported_module_name.is_null() {
-                    break
-                }
-
-                let imported_module_name = CStr::from_ptr(imported_module_name)
-                    .to_str()
-                    .expect("Non-utf8 LLVM module name encountered")
-                    .to_owned();
-
-                imported_modules.push(imported_module_name);
-                entry_ptr = entry_ptr.offset(1);
-            }
-
-            imports.insert(importing_module_name, imported_modules);
-
-            module_ptr = module_ptr.offset(1);
-            module_index += 1;
-        }
-
-        assert_eq!(module_index, imports.len());
-
-        ThinLTOImports {
-            imports
-        }
-    }
-}

src/librustc_llvm/ffi.rs

@@ -351,11 +351,6 @@ pub enum ThinLTOData {}
 /// LLVMRustThinLTOBuffer
 pub enum ThinLTOBuffer {}
 
-/// LLVMRustThinLTOModuleName
-pub type ThinLTOModuleName = *const c_char;
-/// LLVMRustThinLTOModuleImports
-pub type ThinLTOModuleImports = *const ThinLTOModuleName;
-
 /// LLVMRustThinLTOModule
 #[repr(C)]
 pub struct ThinLTOModule {
@@ -1784,9 +1779,6 @@ extern "C" {
         Data: *const ThinLTOData,
         Module: ModuleRef,
     ) -> bool;
-    pub fn LLVMRustGetThinLTOModuleImports(
-        Data: *const ThinLTOData,
-    ) -> *const ThinLTOModuleImports;
     pub fn LLVMRustFreeThinLTOData(Data: *mut ThinLTOData);
     pub fn LLVMRustParseBitcodeForThinLTO(
         Context: ContextRef,

src/rustllvm/PassWrapper.cpp

@@ -798,11 +798,6 @@ LLVMRustPGOAvailable() {
 #endif
 }
 
-// We encode the ThinLTO module import map as a nested null-terminated list to
-// get it into Rust.
-typedef const char* LLVMRustThinLTOModuleName;
-typedef LLVMRustThinLTOModuleName* LLVMRustThinLTOModuleImports;
-
 #if LLVM_VERSION_GE(4, 0)
 
 // Here you'll find an implementation of ThinLTO as used by the Rust compiler
@@ -1104,52 +1099,6 @@ LLVMRustPrepareThinLTOImport(const LLVMRustThinLTOData *Data, LLVMModuleRef M) {
   return true;
 }
 
-/// Converts the LLVMRustThinLTOData::ImportLists map into a nested list. The
-/// first level is a null-terminated array with an entry for each module. Each
-/// entry is a pointer that points to a null-termined array of module names. The
-/// first entry is always the name of the *importing* module, the following
-/// entries are  the names of the modules it imports from. Each module name is
-/// a regular C string.
-extern "C" LLVMRustThinLTOModuleImports*
-LLVMRustGetThinLTOModuleImports(const LLVMRustThinLTOData *Data) {
-  // Allocate number of module +1. This is a null-terminated array.
-  LLVMRustThinLTOModuleImports* thinLTOModuleImports =
-    new LLVMRustThinLTOModuleImports[Data->ImportLists.size() + 1];
-  size_t module_index = 0;
-
-  for (const auto & module : Data->ImportLists) {
-    StringRef module_id = module.getKey();
-    const auto& imports = module.getValue();
-
-    // Allocate number of imported module + 2, one extra for the name of the
-    // importing module and another one for null-termination.
-    LLVMRustThinLTOModuleImports imports_array =
-      new LLVMRustThinLTOModuleName[imports.size() + 2];
-
-    // The first value is always the name of the *importing* module.
-    imports_array[0] = strndup(module_id.data(), module_id.size());
-
-    size_t imports_array_index = 1;
-    for (const auto imported_module_id : imports.keys()) {
-      // The following values are the names of the imported modules.
-      imports_array[imports_array_index] = strndup(imported_module_id.data(),
-                                                   imported_module_id.size());
-      imports_array_index += 1;
-    }
-
-    assert(imports_array_index == imports.size() + 1);
-    imports_array[imports_array_index] = nullptr;
-
-    thinLTOModuleImports[module_index] = imports_array;
-    module_index += 1;
-  }
-
-  assert(module_index == Data->ImportLists.size());
-  thinLTOModuleImports[module_index] = nullptr;
-
-  return thinLTOModuleImports;
-}
-
 // This struct and various functions are sort of a hack right now, but the
 // problem is that we've got in-memory LLVM modules after we generate and
 // optimize all codegen-units for one compilation in rustc. To be compatible
@@ -1331,11 +1280,6 @@ LLVMRustPrepareThinLTOImport(const LLVMRustThinLTOData *Data, LLVMModuleRef M) {
   report_fatal_error("ThinLTO not available");
 }
 
-extern "C" LLVMRustThinLTOModuleImports
-LLVMRustGetLLVMRustThinLTOModuleImports(const LLVMRustThinLTOData *Data) {
-  report_fatal_error("ThinLTO not available");
-}
-
 extern "C" void
 LLVMRustFreeThinLTOData(LLVMRustThinLTOData *Data) {
   report_fatal_error("ThinLTO not available");