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243 lines
8.9 KiB
C++
243 lines
8.9 KiB
C++
//===-- cc1_main.cpp - Clang CC1 Compiler Frontend ------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This is the entry point to the clang -cc1 functionality, which implements the
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// core compiler functionality along with a number of additional tools for
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// demonstration and testing purposes.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Option/Arg.h"
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#include "clang/CodeGen/ObjectFilePCHContainerOperations.h"
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#include "clang/Config/config.h"
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#include "clang/Driver/DriverDiagnostic.h"
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#include "clang/Driver/Options.h"
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#include "clang/Frontend/CompilerInstance.h"
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#include "clang/Frontend/CompilerInvocation.h"
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#include "clang/Frontend/FrontendDiagnostic.h"
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#include "clang/Frontend/TextDiagnosticBuffer.h"
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#include "clang/Frontend/TextDiagnosticPrinter.h"
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#include "clang/Frontend/Utils.h"
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#include "clang/FrontendTool/Utils.h"
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#include "llvm/ADT/Statistic.h"
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#include "llvm/LinkAllPasses.h"
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#include "llvm/Option/ArgList.h"
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#include "llvm/Option/OptTable.h"
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#include "llvm/Support/Compiler.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/ManagedStatic.h"
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#include "llvm/Support/Signals.h"
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#include "llvm/Support/TargetSelect.h"
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#include "llvm/Support/Timer.h"
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#include "llvm/Support/raw_ostream.h"
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#include <cstdio>
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#ifdef CLANG_HAVE_RLIMITS
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#include <sys/resource.h>
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#endif
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// have no .a version in packages
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#undef LINK_POLLY_INTO_TOOLS
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using namespace clang;
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using namespace llvm::opt;
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//===----------------------------------------------------------------------===//
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// Main driver
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//===----------------------------------------------------------------------===//
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static void LLVMErrorHandler(void *UserData, const std::string &Message,
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bool GenCrashDiag) {
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DiagnosticsEngine &Diags = *static_cast<DiagnosticsEngine*>(UserData);
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Diags.Report(diag::err_fe_error_backend) << Message;
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// Run the interrupt handlers to make sure any special cleanups get done, in
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// particular that we remove files registered with RemoveFileOnSignal.
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llvm::sys::RunInterruptHandlers();
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// We cannot recover from llvm errors. When reporting a fatal error, exit
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// with status 70 to generate crash diagnostics. For BSD systems this is
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// defined as an internal software error. Otherwise, exit with status 1.
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exit(GenCrashDiag ? 70 : 1);
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}
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#ifdef LINK_POLLY_INTO_TOOLS
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namespace polly {
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void initializePollyPasses(llvm::PassRegistry &Registry);
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}
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#endif
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#ifdef CLANG_HAVE_RLIMITS
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// The amount of stack we think is "sufficient". If less than this much is
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// available, we may be unable to reach our template instantiation depth
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// limit and other similar limits.
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// FIXME: Unify this with the stack we request when spawning a thread to build
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// a module.
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static const int kSufficientStack = 8 << 20;
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#if defined(__linux__) && defined(__PIE__)
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static size_t getCurrentStackAllocation() {
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// If we can't compute the current stack usage, allow for 512K of command
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// line arguments and environment.
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size_t Usage = 512 * 1024;
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if (FILE *StatFile = fopen("/proc/self/stat", "r")) {
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// We assume that the stack extends from its current address to the end of
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// the environment space. In reality, there is another string literal (the
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// program name) after the environment, but this is close enough (we only
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// need to be within 100K or so).
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unsigned long StackPtr, EnvEnd;
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// Disable silly GCC -Wformat warning that complains about length
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// modifiers on ignored format specifiers. We want to retain these
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// for documentation purposes even though they have no effect.
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#if defined(__GNUC__) && !defined(__clang__)
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wformat"
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#endif
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if (fscanf(StatFile,
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"%*d %*s %*c %*d %*d %*d %*d %*d %*u %*lu %*lu %*lu %*lu %*lu "
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"%*lu %*ld %*ld %*ld %*ld %*ld %*ld %*llu %*lu %*ld %*lu %*lu "
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"%*lu %*lu %lu %*lu %*lu %*lu %*lu %*lu %*llu %*lu %*lu %*d %*d "
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"%*u %*u %*llu %*lu %*ld %*lu %*lu %*lu %*lu %*lu %*lu %lu %*d",
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&StackPtr, &EnvEnd) == 2) {
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#if defined(__GNUC__) && !defined(__clang__)
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#pragma GCC diagnostic pop
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#endif
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Usage = StackPtr < EnvEnd ? EnvEnd - StackPtr : StackPtr - EnvEnd;
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}
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fclose(StatFile);
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}
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return Usage;
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}
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#include <alloca.h>
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LLVM_ATTRIBUTE_NOINLINE
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static void ensureStackAddressSpace(int ExtraChunks = 0) {
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// Linux kernels prior to 4.1 will sometimes locate the heap of a PIE binary
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// relatively close to the stack (they are only guaranteed to be 128MiB
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// apart). This results in crashes if we happen to heap-allocate more than
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// 128MiB before we reach our stack high-water mark.
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//
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// To avoid these crashes, ensure that we have sufficient virtual memory
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// pages allocated before we start running.
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size_t Curr = getCurrentStackAllocation();
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const int kTargetStack = kSufficientStack - 256 * 1024;
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if (Curr < kTargetStack) {
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volatile char *volatile Alloc =
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static_cast<volatile char *>(alloca(kTargetStack - Curr));
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Alloc[0] = 0;
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Alloc[kTargetStack - Curr - 1] = 0;
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}
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}
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#else
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static void ensureStackAddressSpace() {}
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#endif
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/// Attempt to ensure that we have at least 8MiB of usable stack space.
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static void ensureSufficientStack() {
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struct rlimit rlim;
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if (getrlimit(RLIMIT_STACK, &rlim) != 0)
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return;
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// Increase the soft stack limit to our desired level, if necessary and
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// possible.
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if (rlim.rlim_cur != RLIM_INFINITY && rlim.rlim_cur < kSufficientStack) {
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// Try to allocate sufficient stack.
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if (rlim.rlim_max == RLIM_INFINITY || rlim.rlim_max >= kSufficientStack)
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rlim.rlim_cur = kSufficientStack;
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else if (rlim.rlim_cur == rlim.rlim_max)
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return;
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else
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rlim.rlim_cur = rlim.rlim_max;
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if (setrlimit(RLIMIT_STACK, &rlim) != 0 ||
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rlim.rlim_cur != kSufficientStack)
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return;
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}
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// We should now have a stack of size at least kSufficientStack. Ensure
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// that we can actually use that much, if necessary.
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ensureStackAddressSpace();
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}
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#else
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static void ensureSufficientStack() {}
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#endif
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int cc1_main(ArrayRef<const char *> Argv, const char *Argv0, void *MainAddr) {
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ensureSufficientStack();
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std::unique_ptr<CompilerInstance> Clang(new CompilerInstance());
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IntrusiveRefCntPtr<DiagnosticIDs> DiagID(new DiagnosticIDs());
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// Register the support for object-file-wrapped Clang modules.
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auto PCHOps = Clang->getPCHContainerOperations();
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PCHOps->registerWriter(llvm::make_unique<ObjectFilePCHContainerWriter>());
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PCHOps->registerReader(llvm::make_unique<ObjectFilePCHContainerReader>());
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// Initialize targets first, so that --version shows registered targets.
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llvm::InitializeAllTargets();
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llvm::InitializeAllTargetMCs();
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llvm::InitializeAllAsmPrinters();
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llvm::InitializeAllAsmParsers();
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#ifdef LINK_POLLY_INTO_TOOLS
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llvm::PassRegistry &Registry = *llvm::PassRegistry::getPassRegistry();
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polly::initializePollyPasses(Registry);
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#endif
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// Buffer diagnostics from argument parsing so that we can output them using a
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// well formed diagnostic object.
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IntrusiveRefCntPtr<DiagnosticOptions> DiagOpts = new DiagnosticOptions();
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TextDiagnosticBuffer *DiagsBuffer = new TextDiagnosticBuffer;
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DiagnosticsEngine Diags(DiagID, &*DiagOpts, DiagsBuffer);
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bool Success = CompilerInvocation::CreateFromArgs(
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Clang->getInvocation(), Argv.begin(), Argv.end(), Diags);
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// Infer the builtin include path if unspecified.
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if (Clang->getHeaderSearchOpts().UseBuiltinIncludes &&
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Clang->getHeaderSearchOpts().ResourceDir.empty())
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Clang->getHeaderSearchOpts().ResourceDir =
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CompilerInvocation::GetResourcesPath(Argv0, MainAddr);
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// Create the actual diagnostics engine.
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Clang->createDiagnostics();
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if (!Clang->hasDiagnostics())
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return 1;
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// Set an error handler, so that any LLVM backend diagnostics go through our
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// error handler.
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llvm::install_fatal_error_handler(LLVMErrorHandler,
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static_cast<void*>(&Clang->getDiagnostics()));
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DiagsBuffer->FlushDiagnostics(Clang->getDiagnostics());
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if (!Success)
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return 1;
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// Execute the frontend actions.
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Success = ExecuteCompilerInvocation(Clang.get());
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// If any timers were active but haven't been destroyed yet, print their
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// results now. This happens in -disable-free mode.
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llvm::TimerGroup::printAll(llvm::errs());
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// Our error handler depends on the Diagnostics object, which we're
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// potentially about to delete. Uninstall the handler now so that any
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// later errors use the default handling behavior instead.
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llvm::remove_fatal_error_handler();
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// When running with -disable-free, don't do any destruction or shutdown.
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if (Clang->getFrontendOpts().DisableFree) {
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BuryPointer(std::move(Clang));
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return !Success;
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}
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return !Success;
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}
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