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![Ryan Macnak](/assets/img/avatar_default.png)
Bug: FL-261 Change-Id: I5eae25134816d24b91cda8afa86deb402c7d9b52 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/105060 Reviewed-by: Zach Anderson <zra@google.com> Commit-Queue: Ryan Macnak <rmacnak@google.com>
157 lines
4.1 KiB
C++
157 lines
4.1 KiB
C++
// Copyright (c) 2016, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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#include "vm/globals.h"
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#if defined(HOST_OS_FUCHSIA)
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#include "platform/memory_sanitizer.h"
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#include "vm/native_symbol.h"
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#include <dlfcn.h> // NOLINT
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namespace dart {
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// On Fuchsia, in lieu of the ELF dynamic symbol table consumed through dladdr,
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// we consumes symbols produced by //topaz/runtime/dart/profiler_symbols and
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// provided to the VM by the embedder through Dart_AddSymbols. They have the
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// format
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//
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// struct {
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// uint32_t num_entries;
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// struct {
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// uint32_t offset;
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// uint32_t size;
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// uint32_t string_table_offset;
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// } entries[num_entries];
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// const char* string_table;
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// }
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//
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// Entries are sorted by offset. String table entries are NUL-terminated.
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class NativeSymbols {
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public:
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NativeSymbols(const char* dso_name, void* buffer, size_t size)
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: next_(NULL), dso_name_(dso_name) {
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num_entries_ = *reinterpret_cast<uint32_t*>(buffer);
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entries_ =
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reinterpret_cast<Entry*>(reinterpret_cast<uint32_t*>(buffer) + 1);
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name_table_ = reinterpret_cast<const char*>(entries_ + num_entries_);
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}
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NativeSymbols* next() const { return next_; }
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void set_next(NativeSymbols* symbols) { next_ = symbols; }
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bool Lookup(const char* dso_name,
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uword dso_offset,
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uword* start_offset,
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const char** name) {
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if (strcmp(dso_name, dso_name_) != 0) {
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return false;
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}
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intptr_t lo = 0;
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intptr_t hi = num_entries_ - 1;
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while (lo <= hi) {
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intptr_t mid = (hi - lo + 1) / 2 + lo;
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ASSERT(mid >= lo);
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ASSERT(mid <= hi);
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const Entry& entry = entries_[mid];
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if (dso_offset < entry.offset) {
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hi = mid - 1;
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} else if (dso_offset >= (entry.offset + entry.size)) {
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lo = mid + 1;
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} else {
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*start_offset = entry.offset;
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*name = &name_table_[entry.name_offset];
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return true;
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}
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}
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return false;
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}
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private:
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struct Entry {
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uint32_t offset;
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uint32_t size;
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uint32_t name_offset;
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};
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NativeSymbols* next_;
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const char* const dso_name_;
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intptr_t num_entries_;
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Entry* entries_;
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const char* name_table_;
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DISALLOW_COPY_AND_ASSIGN(NativeSymbols);
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};
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static NativeSymbols* symbols_ = NULL;
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void NativeSymbolResolver::Init() {}
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void NativeSymbolResolver::Cleanup() {
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NativeSymbols* symbols = symbols_;
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symbols_ = NULL;
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while (symbols != NULL) {
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NativeSymbols* next = symbols->next();
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delete symbols;
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symbols = next;
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}
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}
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char* NativeSymbolResolver::LookupSymbolName(uintptr_t pc, uintptr_t* start) {
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Dl_info info;
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int r = dladdr(reinterpret_cast<void*>(pc), &info);
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if (r == 0) {
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return NULL;
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}
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const char* dso_name = info.dli_fname;
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uword dso_base = reinterpret_cast<uword>(info.dli_fbase);
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uword dso_offset = pc - dso_base;
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for (NativeSymbols* symbols = symbols_; symbols != NULL;
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symbols = symbols->next()) {
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uword symbol_start_offset;
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const char* symbol_name;
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if (symbols->Lookup(dso_name, dso_offset, &symbol_start_offset,
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&symbol_name)) {
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if (start != NULL) {
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*start = symbol_start_offset + dso_base;
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}
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return strdup(symbol_name);
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}
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}
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return NULL;
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}
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void NativeSymbolResolver::FreeSymbolName(char* name) {
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free(name);
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}
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bool NativeSymbolResolver::LookupSharedObject(uword pc,
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uword* dso_base,
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char** dso_name) {
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Dl_info info;
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int r = dladdr(reinterpret_cast<void*>(pc), &info);
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if (r == 0) {
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return false;
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}
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*dso_base = reinterpret_cast<uword>(info.dli_fbase);
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*dso_name = strdup(info.dli_fname);
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return true;
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}
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void NativeSymbolResolver::AddSymbols(const char* dso_name,
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void* buffer, size_t size) {
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NativeSymbols* symbols = new NativeSymbols(dso_name, buffer, size);
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symbols->set_next(symbols_);
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symbols_ = symbols;
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}
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} // namespace dart
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#endif // defined(HOST_OS_FUCHSIA)
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