gtbercea updated this revision to Diff 93192.
gtbercea added a comment.
Herald added a subscriber: rengolin.
Update patch to reflect latest source code changes.
Repository:
rL LLVM
https://reviews.llvm.org/D29654
Files:
lib/Driver/ToolChains/CommonArgs.cpp
lib/Driver/ToolChains/CommonArgs.h
lib/Driver/ToolChains/Cuda.cpp
lib/Driver/ToolChains/Gnu.cpp
test/Driver/openmp-offload.c
Index: test/Driver/openmp-offload.c
===================================================================
--- test/Driver/openmp-offload.c
+++ test/Driver/openmp-offload.c
@@ -590,6 +590,17 @@
/// ###########################################################################
+/// Check cubin file generation and usage by nvlink
+// RUN: %clang -### -fopenmp=libomp -fopenmp-targets=nvptx64-nvidia-cuda -save-temps -no-canonical-prefixes %s 2>&1 \
+// RUN: | FileCheck -check-prefix=CHK-CUBIN %s
+
+// CHK-CUBIN: clang{{.*}}" "-o" "{{.*}}-openmp-nvptx64-nvidia-cuda.s"
+// CHK-CUBIN-NEXT: ptxas{{.*}}" "--output-file" "{{.*}}-openmp-nvptx64-nvidia-cuda.o" "{{.*}}-openmp-nvptx64-nvidia-cuda.s"
+// CHK-CUBIN-NEXT: cp{{.*}}-openmp-nvptx64-nvidia-cuda.o" "{{.*}}-openmp-nvptx64-nvidia-cuda-{{.*}}.cubin"
+// CHK-CUBIN-NEXT: nvlink" "-o" "{{.*}}-openmp-nvptx64-nvidia-cuda" "{{.*}}" "{{.*}}-openmp-nvptx64-nvidia-cuda-{{.*}}.cubin"
+
+/// ###########################################################################
+
/// Check PTXAS is passed -c flag when offloading to an NVIDIA device using OpenMP.
// RUN: %clang -### -fopenmp=libomp -fopenmp-targets=nvptx64-nvidia-cuda -save-temps -no-canonical-prefixes %s 2>&1 \
// RUN: | FileCheck -check-prefix=CHK-PTXAS %s
Index: lib/Driver/ToolChains/Gnu.cpp
===================================================================
--- lib/Driver/ToolChains/Gnu.cpp
+++ lib/Driver/ToolChains/Gnu.cpp
@@ -203,131 +203,6 @@
// The types are (hopefully) good enough.
}
-/// Add OpenMP linker script arguments at the end of the argument list so that
-/// the fat binary is built by embedding each of the device images into the
-/// host. The linker script also defines a few symbols required by the code
-/// generation so that the images can be easily retrieved at runtime by the
-/// offloading library. This should be used only in tool chains that support
-/// linker scripts.
-static void AddOpenMPLinkerScript(const ToolChain &TC, Compilation &C,
- const InputInfo &Output,
- const InputInfoList &Inputs,
- const ArgList &Args, ArgStringList &CmdArgs,
- const JobAction &JA) {
-
- // If this is not an OpenMP host toolchain, we don't need to do anything.
- if (!JA.isHostOffloading(Action::OFK_OpenMP))
- return;
-
- // Create temporary linker script. Keep it if save-temps is enabled.
- const char *LKS;
- SmallString<256> Name = llvm::sys::path::filename(Output.getFilename());
- if (C.getDriver().isSaveTempsEnabled()) {
- llvm::sys::path::replace_extension(Name, "lk");
- LKS = C.getArgs().MakeArgString(Name.c_str());
- } else {
- llvm::sys::path::replace_extension(Name, "");
- Name = C.getDriver().GetTemporaryPath(Name, "lk");
- LKS = C.addTempFile(C.getArgs().MakeArgString(Name.c_str()));
- }
-
- // Add linker script option to the command.
- CmdArgs.push_back("-T");
- CmdArgs.push_back(LKS);
-
- // Create a buffer to write the contents of the linker script.
- std::string LksBuffer;
- llvm::raw_string_ostream LksStream(LksBuffer);
-
- // Get the OpenMP offload tool chains so that we can extract the triple
- // associated with each device input.
- auto OpenMPToolChains = C.getOffloadToolChains<Action::OFK_OpenMP>();
- assert(OpenMPToolChains.first != OpenMPToolChains.second &&
- "No OpenMP toolchains??");
-
- // Track the input file name and device triple in order to build the script,
- // inserting binaries in the designated sections.
- SmallVector<std::pair<std::string, const char *>, 8> InputBinaryInfo;
-
- // Add commands to embed target binaries. We ensure that each section and
- // image is 16-byte aligned. This is not mandatory, but increases the
- // likelihood of data to be aligned with a cache block in several main host
- // machines.
- LksStream << "/*\n";
- LksStream << " OpenMP Offload Linker Script\n";
- LksStream << " *** Automatically generated by Clang ***\n";
- LksStream << "*/\n";
- LksStream << "TARGET(binary)\n";
- auto DTC = OpenMPToolChains.first;
- for (auto &II : Inputs) {
- const Action *A = II.getAction();
- // Is this a device linking action?
- if (A && isa<LinkJobAction>(A) &&
- A->isDeviceOffloading(Action::OFK_OpenMP)) {
- assert(DTC != OpenMPToolChains.second &&
- "More device inputs than device toolchains??");
- InputBinaryInfo.push_back(std::make_pair(
- DTC->second->getTriple().normalize(), II.getFilename()));
- ++DTC;
- LksStream << "INPUT(" << II.getFilename() << ")\n";
- }
- }
-
- assert(DTC == OpenMPToolChains.second &&
- "Less device inputs than device toolchains??");
-
- LksStream << "SECTIONS\n";
- LksStream << "{\n";
- LksStream << " .omp_offloading :\n";
- LksStream << " ALIGN(0x10)\n";
- LksStream << " {\n";
-
- for (auto &BI : InputBinaryInfo) {
- LksStream << " . = ALIGN(0x10);\n";
- LksStream << " PROVIDE_HIDDEN(.omp_offloading.img_start." << BI.first
- << " = .);\n";
- LksStream << " " << BI.second << "\n";
- LksStream << " PROVIDE_HIDDEN(.omp_offloading.img_end." << BI.first
- << " = .);\n";
- }
-
- LksStream << " }\n";
- // Add commands to define host entries begin and end. We use 1-byte subalign
- // so that the linker does not add any padding and the elements in this
- // section form an array.
- LksStream << " .omp_offloading.entries :\n";
- LksStream << " ALIGN(0x10)\n";
- LksStream << " SUBALIGN(0x01)\n";
- LksStream << " {\n";
- LksStream << " PROVIDE_HIDDEN(.omp_offloading.entries_begin = .);\n";
- LksStream << " *(.omp_offloading.entries)\n";
- LksStream << " PROVIDE_HIDDEN(.omp_offloading.entries_end = .);\n";
- LksStream << " }\n";
- LksStream << "}\n";
- LksStream << "INSERT BEFORE .data\n";
- LksStream.flush();
-
- // Dump the contents of the linker script if the user requested that. We
- // support this option to enable testing of behavior with -###.
- if (C.getArgs().hasArg(options::OPT_fopenmp_dump_offload_linker_script))
- llvm::errs() << LksBuffer;
-
- // If this is a dry run, do not create the linker script file.
- if (C.getArgs().hasArg(options::OPT__HASH_HASH_HASH))
- return;
-
- // Open script file and write the contents.
- std::error_code EC;
- llvm::raw_fd_ostream Lksf(LKS, EC, llvm::sys::fs::F_None);
-
- if (EC) {
- C.getDriver().Diag(clang::diag::err_unable_to_make_temp) << EC.message();
- return;
- }
-
- Lksf << LksBuffer;
-}
-
static bool addXRayRuntime(const ToolChain &TC, const ArgList &Args,
ArgStringList &CmdArgs) {
if (Args.hasFlag(options::OPT_fxray_instrument,
Index: lib/Driver/ToolChains/Cuda.cpp
===================================================================
--- lib/Driver/ToolChains/Cuda.cpp
+++ lib/Driver/ToolChains/Cuda.cpp
@@ -9,7 +9,9 @@
#include "Cuda.h"
#include "InputInfo.h"
+#include "CommonArgs.h"
#include "clang/Basic/Cuda.h"
+#include "clang/Config/config.h"
#include "clang/Basic/VirtualFileSystem.h"
#include "clang/Driver/Compilation.h"
#include "clang/Driver/Driver.h"
@@ -314,6 +316,94 @@
assert(TC.getTriple().isNVPTX() && "Wrong platform");
ArgStringList CmdArgs;
+
+ // OpenMP uses nvlink to link cubin files. The result will be embedded in the
+ // host binary by the host linker.
+ assert(!JA.isHostOffloading(Action::OFK_OpenMP) &&
+ "CUDA toolchain not expected for an OpenMP host device.");
+ if (JA.isDeviceOffloading(Action::OFK_OpenMP)) {
+ if (Output.isFilename()) {
+ CmdArgs.push_back("-o");
+ CmdArgs.push_back(Output.getFilename());
+ } else
+ assert(Output.isNothing() && "Invalid output.");
+ if (Args.hasArg(options::OPT_g_Flag))
+ CmdArgs.push_back("-g");
+
+ if (Args.hasArg(options::OPT_v))
+ CmdArgs.push_back("-v");
+
+ std::vector<std::string> GPUArchs =
+ Args.getAllArgValues(options::OPT_march_EQ);
+ assert(GPUArchs.size() == 1 && "Exactly one GPU Arch required for ptxas.");
+ const std::string &GPUArch = GPUArchs[0];
+
+ CmdArgs.push_back("-arch");
+ CmdArgs.push_back(Args.MakeArgString(GPUArch));
+
+ // add paths specified in LIBRARY_PATH environment variable as -L options.
+ addDirectoryList(Args, CmdArgs, "-L", "LIBRARY_PATH");
+
+ // add paths for the default clang library path.
+ SmallString<256> DefaultLibPath =
+ llvm::sys::path::parent_path(TC.getDriver().Dir);
+ llvm::sys::path::append(DefaultLibPath, "lib" CLANG_LIBDIR_SUFFIX);
+ CmdArgs.push_back(Args.MakeArgString(Twine("-L") + DefaultLibPath));
+
+ // add linking against library implementing OpenMP calls on NVPTX target
+ CmdArgs.push_back("-lomptarget-nvptx");
+
+ // nvlink relies on the extension used by the input files
+ // to decide what to do. Given that ptxas produces cubin files
+ // we need to copy the input files to a new file with the right
+ // extension.
+ // FIXME: this can be efficiently done by specifying a new
+ // output type for the assembly action, however this would expose
+ // the target details to the driver and maybe we do not want to do
+ // that
+ for (const auto &II : Inputs) {
+
+ if (II.getType() == types::TY_LLVM_IR ||
+ II.getType() == types::TY_LTO_IR ||
+ II.getType() == types::TY_LTO_BC ||
+ II.getType() == types::TY_LLVM_BC) {
+ C.getDriver().Diag(diag::err_drv_no_linker_llvm_support)
+ << getToolChain().getTripleString();
+ continue;
+ }
+
+ // Currently, we only pass the input files to the linker, we do not pass
+ // any libraries that may be valid only for the host.
+ if (!II.isFilename())
+ continue;
+
+ StringRef Name = llvm::sys::path::filename(II.getFilename());
+ std::pair<StringRef, StringRef> Split = Name.rsplit('.');
+ std::string TmpName =
+ C.getDriver().GetTemporaryPath(Split.first, "cubin");
+
+ const char *CubinF =
+ C.addTempFile(C.getArgs().MakeArgString(TmpName.c_str()));
+
+ const char *CopyExec = Args.MakeArgString(getToolChain().GetProgramPath(
+ C.getDriver().IsCLMode() ? "copy" : "cp"));
+ ArgStringList CopyCmdArgs;
+ CopyCmdArgs.push_back(II.getFilename());
+ CopyCmdArgs.push_back(CubinF);
+ C.addCommand(
+ llvm::make_unique<Command>(JA, *this, CopyExec, CopyCmdArgs, Inputs));
+
+ CmdArgs.push_back(CubinF);
+ }
+
+ AddOpenMPLinkerScript(getToolChain(), C, Output, Inputs, Args, CmdArgs, JA);
+
+ const char *Exec =
+ Args.MakeArgString(getToolChain().GetProgramPath("nvlink"));
+ C.addCommand(llvm::make_unique<Command>(JA, *this, Exec, CmdArgs, Inputs));
+ return;
+ }
+
CmdArgs.push_back("--cuda");
CmdArgs.push_back(TC.getTriple().isArch64Bit() ? "-64" : "-32");
CmdArgs.push_back(Args.MakeArgString("--create"));
Index: lib/Driver/ToolChains/CommonArgs.h
===================================================================
--- lib/Driver/ToolChains/CommonArgs.h
+++ lib/Driver/ToolChains/CommonArgs.h
@@ -39,6 +39,13 @@
llvm::opt::ArgStringList &CmdArgs,
const llvm::opt::ArgList &Args);
+void AddOpenMPLinkerScript(const ToolChain &TC, Compilation &C,
+ const InputInfo &Output,
+ const InputInfoList &Inputs,
+ const llvm::opt::ArgList &Args,
+ llvm::opt::ArgStringList &CmdArgs,
+ const JobAction &JA);
+
const char *SplitDebugName(const llvm::opt::ArgList &Args,
const InputInfo &Input);
Index: lib/Driver/ToolChains/CommonArgs.cpp
===================================================================
--- lib/Driver/ToolChains/CommonArgs.cpp
+++ lib/Driver/ToolChains/CommonArgs.cpp
@@ -969,3 +969,128 @@
break;
}
}
+
+/// Add OpenMP linker script arguments at the end of the argument list so that
+/// the fat binary is built by embedding each of the device images into the
+/// host. The linker script also defines a few symbols required by the code
+/// generation so that the images can be easily retrieved at runtime by the
+/// offloading library. This should be used only in tool chains that support
+/// linker scripts.
+void tools::AddOpenMPLinkerScript(const ToolChain &TC, Compilation &C,
+ const InputInfo &Output,
+ const InputInfoList &Inputs,
+ const ArgList &Args, ArgStringList &CmdArgs,
+ const JobAction &JA) {
+
+ // If this is not an OpenMP host toolchain, we don't need to do anything.
+ if (!JA.isHostOffloading(Action::OFK_OpenMP))
+ return;
+
+ // Create temporary linker script. Keep it if save-temps is enabled.
+ const char *LKS;
+ SmallString<256> Name = llvm::sys::path::filename(Output.getFilename());
+ if (C.getDriver().isSaveTempsEnabled()) {
+ llvm::sys::path::replace_extension(Name, "lk");
+ LKS = C.getArgs().MakeArgString(Name.c_str());
+ } else {
+ llvm::sys::path::replace_extension(Name, "");
+ Name = C.getDriver().GetTemporaryPath(Name, "lk");
+ LKS = C.addTempFile(C.getArgs().MakeArgString(Name.c_str()));
+ }
+
+ // Add linker script option to the command.
+ CmdArgs.push_back("-T");
+ CmdArgs.push_back(LKS);
+
+ // Create a buffer to write the contents of the linker script.
+ std::string LksBuffer;
+ llvm::raw_string_ostream LksStream(LksBuffer);
+
+ // Get the OpenMP offload tool chains so that we can extract the triple
+ // associated with each device input.
+ auto OpenMPToolChains = C.getOffloadToolChains<Action::OFK_OpenMP>();
+ assert(OpenMPToolChains.first != OpenMPToolChains.second &&
+ "No OpenMP toolchains??");
+
+ // Track the input file name and device triple in order to build the script,
+ // inserting binaries in the designated sections.
+ SmallVector<std::pair<std::string, const char *>, 8> InputBinaryInfo;
+
+ // Add commands to embed target binaries. We ensure that each section and
+ // image is 16-byte aligned. This is not mandatory, but increases the
+ // likelihood of data to be aligned with a cache block in several main host
+ // machines.
+ LksStream << "/*\n";
+ LksStream << " OpenMP Offload Linker Script\n";
+ LksStream << " *** Automatically generated by Clang ***\n";
+ LksStream << "*/\n";
+ LksStream << "TARGET(binary)\n";
+ auto DTC = OpenMPToolChains.first;
+ for (auto &II : Inputs) {
+ const Action *A = II.getAction();
+ // Is this a device linking action?
+ if (A && isa<LinkJobAction>(A) &&
+ A->isDeviceOffloading(Action::OFK_OpenMP)) {
+ assert(DTC != OpenMPToolChains.second &&
+ "More device inputs than device toolchains??");
+ InputBinaryInfo.push_back(std::make_pair(
+ DTC->second->getTriple().normalize(), II.getFilename()));
+ ++DTC;
+ LksStream << "INPUT(" << II.getFilename() << ")\n";
+ }
+ }
+
+ assert(DTC == OpenMPToolChains.second &&
+ "Less device inputs than device toolchains??");
+
+ LksStream << "SECTIONS\n";
+ LksStream << "{\n";
+ LksStream << " .omp_offloading :\n";
+ LksStream << " ALIGN(0x10)\n";
+ LksStream << " {\n";
+
+ for (auto &BI : InputBinaryInfo) {
+ LksStream << " . = ALIGN(0x10);\n";
+ LksStream << " PROVIDE_HIDDEN(.omp_offloading.img_start." << BI.first
+ << " = .);\n";
+ LksStream << " " << BI.second << "\n";
+ LksStream << " PROVIDE_HIDDEN(.omp_offloading.img_end." << BI.first
+ << " = .);\n";
+ }
+
+ LksStream << " }\n";
+ // Add commands to define host entries begin and end. We use 1-byte subalign
+ // so that the linker does not add any padding and the elements in this
+ // section form an array.
+ LksStream << " .omp_offloading.entries :\n";
+ LksStream << " ALIGN(0x10)\n";
+ LksStream << " SUBALIGN(0x01)\n";
+ LksStream << " {\n";
+ LksStream << " PROVIDE_HIDDEN(.omp_offloading.entries_begin = .);\n";
+ LksStream << " *(.omp_offloading.entries)\n";
+ LksStream << " PROVIDE_HIDDEN(.omp_offloading.entries_end = .);\n";
+ LksStream << " }\n";
+ LksStream << "}\n";
+ LksStream << "INSERT BEFORE .data\n";
+ LksStream.flush();
+
+ // Dump the contents of the linker script if the user requested that. We
+ // support this option to enable testing of behavior with -###.
+ if (C.getArgs().hasArg(options::OPT_fopenmp_dump_offload_linker_script))
+ llvm::errs() << LksBuffer;
+
+ // If this is a dry run, do not create the linker script file.
+ if (C.getArgs().hasArg(options::OPT__HASH_HASH_HASH))
+ return;
+
+ // Open script file and write the contents.
+ std::error_code EC;
+ llvm::raw_fd_ostream Lksf(LKS, EC, llvm::sys::fs::F_None);
+
+ if (EC) {
+ C.getDriver().Diag(clang::diag::err_unable_to_make_temp) << EC.message();
+ return;
+ }
+
+ Lksf << LksBuffer;
+}
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