--- /dev/null
+/*===- InstrProfilingPlatformFuchsia.c - Profile data Fuchsia platform ----===*\
+|*
+|* The LLVM Compiler Infrastructure
+|*
+|* This file is distributed under the University of Illinois Open Source
+|* License. See LICENSE.TXT for details.
+|*
+\*===----------------------------------------------------------------------===*/
+/*
+ * This file implements the profiling runtime for Fuchsia and defines the
+ * shared profile runtime interface. Each module (executable or DSO) statically
+ * links in the whole profile runtime to satisfy the calls from its
+ * instrumented code. Several modules in the same program might be separately
+ * compiled and even use different versions of the instrumentation ABI and data
+ * format. All they share in common is the VMO and the offset, which live in
+ * exported globals so that exactly one definition will be shared across all
+ * modules. Each module has its own independent runtime that registers its own
+ * atexit hook to append its own data into the shared VMO which is published
+ * via the data sink hook provided by Fuchsia's dynamic linker.
+ */
+
+#if defined(__Fuchsia__)
+
+#include <inttypes.h>
+#include <stdarg.h>
+#include <stdbool.h>
+#include <stdlib.h>
+
+#include <zircon/process.h>
+#include <zircon/sanitizer.h>
+#include <zircon/syscalls.h>
+
+#include "InstrProfiling.h"
+#include "InstrProfilingInternal.h"
+#include "InstrProfilingUtil.h"
+
+/* VMO that contains the coverage data shared across all modules. This symbol
+ * has default visibility and is exported in each module (executable or DSO)
+ * that statically links in the profiling runtime.
+ */
+zx_handle_t __llvm_profile_vmo;
+/* Current offset within the VMO where data should be written next. This symbol
+ * has default visibility and is exported in each module (executable or DSO)
+ * that statically links in the profiling runtime.
+ */
+uint64_t __llvm_profile_offset;
+
+static const char ProfileSinkName[] = "llvm-profile";
+
+static inline void lprofWrite(const char *fmt, ...) {
+ char s[256];
+
+ va_list ap;
+ va_start(ap, fmt);
+ int ret = vsnprintf(s, sizeof(s), fmt, ap);
+ va_end(ap);
+
+ __sanitizer_log_write(s, ret + 1);
+}
+
+static uint32_t lprofVMOWriter(ProfDataWriter *This, ProfDataIOVec *IOVecs,
+ uint32_t NumIOVecs) {
+ /* Allocate VMO if it hasn't been created yet. */
+ if (__llvm_profile_vmo == ZX_HANDLE_INVALID) {
+ /* Get information about the current process. */
+ zx_info_handle_basic_t Info;
+ zx_status_t Status =
+ _zx_object_get_info(_zx_process_self(), ZX_INFO_HANDLE_BASIC, &Info,
+ sizeof(Info), NULL, NULL);
+ if (Status != ZX_OK)
+ return -1;
+
+ /* Create VMO to hold the profile data. */
+ Status = _zx_vmo_create(0, 0, &__llvm_profile_vmo);
+ if (Status != ZX_OK)
+ return -1;
+
+ /* Give the VMO a name including our process KOID so it's easy to spot. */
+ char VmoName[ZX_MAX_NAME_LEN];
+ snprintf(VmoName, sizeof(VmoName), "%s.%" PRIu64, ProfileSinkName,
+ Info.koid);
+ _zx_object_set_property(__llvm_profile_vmo, ZX_PROP_NAME, VmoName,
+ strlen(VmoName));
+
+ /* Duplicate the handle since __sanitizer_publish_data consumes it. */
+ zx_handle_t Handle;
+ Status =
+ _zx_handle_duplicate(__llvm_profile_vmo, ZX_RIGHT_SAME_RIGHTS, &Handle);
+ if (Status != ZX_OK)
+ return -1;
+
+ /* Publish the VMO which contains profile data to the system. */
+ __sanitizer_publish_data(ProfileSinkName, Handle);
+
+ /* Use the dumpfile symbolizer markup element to write the name of VMO. */
+ lprofWrite("LLVM Profile: {{{dumpfile:%s:%s}}}\n",
+ ProfileSinkName, VmoName);
+ }
+
+ /* Compute the total length of data to be written. */
+ size_t Length = 0;
+ for (uint32_t I = 0; I < NumIOVecs; I++)
+ Length += IOVecs[I].ElmSize * IOVecs[I].NumElm;
+
+ /* Resize the VMO to ensure there's sufficient space for the data. */
+ zx_status_t Status =
+ _zx_vmo_set_size(__llvm_profile_vmo, __llvm_profile_offset + Length);
+ if (Status != ZX_OK)
+ return -1;
+
+ /* Copy the data into VMO. */
+ for (uint32_t I = 0; I < NumIOVecs; I++) {
+ size_t Length = IOVecs[I].ElmSize * IOVecs[I].NumElm;
+ if (IOVecs[I].Data) {
+ Status = _zx_vmo_write(__llvm_profile_vmo, IOVecs[I].Data,
+ __llvm_profile_offset, Length);
+ if (Status != ZX_OK)
+ return -1;
+ }
+ __llvm_profile_offset += Length;
+ }
+
+ return 0;
+}
+
+static void initVMOWriter(ProfDataWriter *This) {
+ This->Write = lprofVMOWriter;
+ This->WriterCtx = NULL;
+}
+
+static int dump(void) {
+ if (lprofProfileDumped()) {
+ lprofWrite("Profile data not published: already written.\n");
+ return 0;
+ }
+
+ /* Check if there is llvm/runtime version mismatch. */
+ if (GET_VERSION(__llvm_profile_get_version()) != INSTR_PROF_RAW_VERSION) {
+ lprofWrite("Runtime and instrumentation version mismatch : "
+ "expected %d, but got %d\n",
+ INSTR_PROF_RAW_VERSION,
+ (int)GET_VERSION(__llvm_profile_get_version()));
+ return -1;
+ }
+
+ /* Write the profile data into the mapped region. */
+ ProfDataWriter VMOWriter;
+ initVMOWriter(&VMOWriter);
+ if (lprofWriteData(&VMOWriter, lprofGetVPDataReader(), 0) != 0)
+ return -1;
+
+ return 0;
+}
+
+COMPILER_RT_VISIBILITY
+int __llvm_profile_dump(void) {
+ int rc = dump();
+ lprofSetProfileDumped();
+ return rc;
+}
+
+static void dumpWithoutReturn(void) { dump(); }
+
+/* This method is invoked by the runtime initialization hook
+ * InstrProfilingRuntime.o if it is linked in.
+ */
+COMPILER_RT_VISIBILITY
+void __llvm_profile_initialize_file(void) {}
+
+COMPILER_RT_VISIBILITY
+int __llvm_profile_register_write_file_atexit(void) {
+ static bool HasBeenRegistered = false;
+
+ if (HasBeenRegistered)
+ return 0;
+
+ lprofSetupValueProfiler();
+
+ HasBeenRegistered = true;
+ return atexit(dumpWithoutReturn);
+}
+
+#endif
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