mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-09-24 22:02:23 +01:00
Chandler Carruth
e34e240263
This removes the `data_dir` from the driver favoring the installation abstraction for the both locating the prelude and linking utilities. With this, an installed toolchain should also be able to compile and link Carbon successfully, and the build of the examples should exercise this path almost exactly. (The only difference is using the driver `cc_binary` directly rather than relying on the symlink from inside the install tree.)
118 lines
4.0 KiB
C++
118 lines
4.0 KiB
C++
// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
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// Exceptions. See /LICENSE for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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#include "toolchain/install/install_paths.h"
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#include <memory>
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#include "common/check.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/Support/FileSystem.h"
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#include "llvm/Support/Path.h"
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#include "tools/cpp/runfiles/runfiles.h"
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namespace Carbon {
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// The location within our Bazel output tree of the prefix_root.
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static constexpr llvm::StringLiteral PrefixRoot =
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"_main/toolchain/install/prefix_root/";
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// Path within an install prefix for our marker of a valid install.
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static constexpr llvm::StringLiteral MarkerPath =
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"lib/carbon/carbon_install.txt";
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auto InstallPaths::MakeExeRelative(llvm::StringRef exe_path) -> InstallPaths {
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InstallPaths paths;
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// Map from the executable path from the executable path to an install
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// prefix path.
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if (!llvm::sys::fs::exists(exe_path)) {
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paths.SetError(llvm::Twine("No file at executable path: ") + exe_path);
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return paths;
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}
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paths = InstallPaths(exe_path);
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// TODO: Detect a Windows executable path and use custom logic to map to the
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// correct install prefix for that platform.
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// We assume an executable will be in a `bin` directory and this is a
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// FHS-like install prefix. We remove the filename and walk up to find the
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// expected install prefix.
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llvm::sys::path::remove_filename(paths.prefix_);
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llvm::sys::path::append(paths.prefix_, llvm::sys::path::Style::posix, "../");
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paths.CheckMarkerFile();
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return paths;
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}
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auto InstallPaths::MakeForBazelRunfiles(llvm::StringRef exe_path)
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-> InstallPaths {
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using bazel::tools::cpp::runfiles::Runfiles;
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std::string runtimes_error;
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std::unique_ptr<Runfiles> runfiles(
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Runfiles::Create(exe_path.str(), &runtimes_error));
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CARBON_CHECK(runfiles != nullptr)
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<< "Failed to find runtimes tree: " << runtimes_error;
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std::string relative_marker_path = (PrefixRoot.str() + MarkerPath).str();
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std::string runtimes_marker_path = runfiles->Rlocation(relative_marker_path);
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// Start from the marker, remove that filename, and walk up to find the
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// install prefix.
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InstallPaths paths(runtimes_marker_path);
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llvm::sys::path::remove_filename(paths.prefix_);
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llvm::sys::path::append(paths.prefix_, llvm::sys::path::Style::posix,
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"../../");
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paths.CheckMarkerFile();
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CARBON_CHECK(!paths.error()) << *paths.error();
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return paths;
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}
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auto InstallPaths::Make(llvm::StringRef install_prefix) -> InstallPaths {
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InstallPaths paths(install_prefix);
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paths.CheckMarkerFile();
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return paths;
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}
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auto InstallPaths::SetError(llvm::Twine message) -> void {
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// Use an empty prefix on error as that should use the working directory which
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// is the least likely problematic.
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prefix_ = "";
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error_ = {message.str()};
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}
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auto InstallPaths::CheckMarkerFile() -> void {
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llvm::SmallString<256> path(prefix_);
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llvm::sys::path::append(path, llvm::sys::path::Style::posix, MarkerPath);
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if (!llvm::sys::fs::exists(path)) {
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SetError(llvm::Twine("No install marker at path: ") + path);
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}
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}
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auto InstallPaths::driver() const -> std::string {
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llvm::SmallString<256> path(prefix_);
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// TODO: Adjust this to work equally well on Windows.
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llvm::sys::path::append(path, llvm::sys::path::Style::posix, "bin/carbon");
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return path.str().str();
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}
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auto InstallPaths::core_package() const -> std::string {
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llvm::SmallString<256> path(prefix_);
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// TODO: Adjust this to work equally well on Windows.
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llvm::sys::path::append(path, llvm::sys::path::Style::posix,
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"lib/carbon/core");
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return path.str().str();
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}
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auto InstallPaths::llvm_install_bin() const -> std::string {
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llvm::SmallString<256> path(prefix_);
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// TODO: Adjust this to work equally well on Windows.
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llvm::sys::path::append(path, llvm::sys::path::Style::posix,
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"lib/carbon/llvm/bin/");
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return path.str().str();
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}
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} // namespace Carbon
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