Update from chromium 62675d9fb31fb8cedc40f68e78e8445a74f362e7

sandbox/linux/seccomp-bpf/errorcode.cc

+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "sandbox/linux/seccomp-bpf/errorcode.h"
+
+#include "sandbox/linux/seccomp-bpf/die.h"
+#include "sandbox/linux/seccomp-bpf/linux_seccomp.h"
+
+namespace sandbox {
+
+ErrorCode::ErrorCode() : error_type_(ET_INVALID), err_(SECCOMP_RET_INVALID) {
+}
+
+ErrorCode::ErrorCode(int err) {
+  switch (err) {
+    case ERR_ALLOWED:
+      err_ = SECCOMP_RET_ALLOW;
+      error_type_ = ET_SIMPLE;
+      break;
+    case ERR_MIN_ERRNO... ERR_MAX_ERRNO:
+      err_ = SECCOMP_RET_ERRNO + err;
+      error_type_ = ET_SIMPLE;
+      break;
+    default:
+      if ((err & ~SECCOMP_RET_DATA) == ERR_TRACE) {
+        err_ = SECCOMP_RET_TRACE + (err & SECCOMP_RET_DATA);
+        error_type_ = ET_SIMPLE;
+        break;
+      }
+      SANDBOX_DIE("Invalid use of ErrorCode object");
+  }
+}
+
+ErrorCode::ErrorCode(uint16_t trap_id,
+                     Trap::TrapFnc fnc,
+                     const void* aux,
+                     bool safe)
+    : error_type_(ET_TRAP),
+      fnc_(fnc),
+      aux_(const_cast<void*>(aux)),
+      safe_(safe),
+      err_(SECCOMP_RET_TRAP + trap_id) {
+}
+
+ErrorCode::ErrorCode(int argno,
+                     ArgType width,
+                     uint64_t mask,
+                     uint64_t value,
+                     const ErrorCode* passed,
+                     const ErrorCode* failed)
+    : error_type_(ET_COND),
+      mask_(mask),
+      value_(value),
+      argno_(argno),
+      width_(width),
+      passed_(passed),
+      failed_(failed),
+      err_(SECCOMP_RET_INVALID) {
+}
+
+bool ErrorCode::Equals(const ErrorCode& err) const {
+  if (error_type_ == ET_INVALID || err.error_type_ == ET_INVALID) {
+    SANDBOX_DIE("Dereferencing invalid ErrorCode");
+  }
+  if (error_type_ != err.error_type_) {
+    return false;
+  }
+  if (error_type_ == ET_SIMPLE || error_type_ == ET_TRAP) {
+    return err_ == err.err_;
+  } else if (error_type_ == ET_COND) {
+    return mask_ == err.mask_ && value_ == err.value_ && argno_ == err.argno_ &&
+           width_ == err.width_ && passed_->Equals(*err.passed_) &&
+           failed_->Equals(*err.failed_);
+  } else {
+    SANDBOX_DIE("Corrupted ErrorCode");
+  }
+}
+
+bool ErrorCode::LessThan(const ErrorCode& err) const {
+  // Implementing a "LessThan()" operator allows us to use ErrorCode objects
+  // as keys in STL containers; most notably, it also allows us to put them
+  // into std::set<>. Actual ordering is not important as long as it is
+  // deterministic.
+  if (error_type_ == ET_INVALID || err.error_type_ == ET_INVALID) {
+    SANDBOX_DIE("Dereferencing invalid ErrorCode");
+  }
+  if (error_type_ != err.error_type_) {
+    return error_type_ < err.error_type_;
+  } else {
+    if (error_type_ == ET_SIMPLE || error_type_ == ET_TRAP) {
+      return err_ < err.err_;
+    } else if (error_type_ == ET_COND) {
+      if (mask_ != err.mask_) {
+        return mask_ < err.mask_;
+      } else if (value_ != err.value_) {
+        return value_ < err.value_;
+      } else if (argno_ != err.argno_) {
+        return argno_ < err.argno_;
+      } else if (width_ != err.width_) {
+        return width_ < err.width_;
+      } else if (!passed_->Equals(*err.passed_)) {
+        return passed_->LessThan(*err.passed_);
+      } else if (!failed_->Equals(*err.failed_)) {
+        return failed_->LessThan(*err.failed_);
+      } else {
+        return false;
+      }
+    } else {
+      SANDBOX_DIE("Corrupted ErrorCode");
+    }
+  }
+}
+
+}  // namespace sandbox