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+// Copyright 2014, ARM Limited
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are met:
+//
+// * Redistributions of source code must retain the above copyright notice,
+// this list of conditions and the following disclaimer.
+// * Redistributions in binary form must reproduce the above copyright notice,
+// this list of conditions and the following disclaimer in the documentation
+// and/or other materials provided with the distribution.
+// * Neither the name of ARM Limited nor the names of its contributors may be
+// used to endorse or promote products derived from this software without
+// specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS CONTRIBUTORS "AS IS" AND
+// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
+// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifdef JS_SIMULATOR_ARM64
+
+#ifndef VIXL_A64_DEBUGGER_A64_H_
+#define VIXL_A64_DEBUGGER_A64_H_
+
+#include <ctype.h>
+#include <errno.h>
+#include <limits.h>
+
+#include "jit/arm64/vixl/Constants-vixl.h"
+#include "jit/arm64/vixl/Globals-vixl.h"
+#include "jit/arm64/vixl/Simulator-vixl.h"
+#include "jit/arm64/vixl/Utils-vixl.h"
+
+namespace vixl {
+
+// Flags that represent the debugger state.
+enum DebugParameters {
+ DBG_INACTIVE = 0,
+ DBG_ACTIVE = 1 << 0, // The debugger is active.
+ DBG_BREAK = 1 << 1 // The debugger is at a breakpoint.
+};
+
+// Forward declarations.
+class DebugCommand;
+class Token;
+class FormatToken;
+
+class Debugger : public Simulator {
+ public:
+ explicit Debugger(Decoder* decoder, FILE* stream = stdout);
+ ~Debugger();
+
+ virtual void Run() override;
+ virtual void VisitException(const Instruction* instr) override;
+
+ int debug_parameters() const { return debug_parameters_; }
+ void set_debug_parameters(int parameters) {
+ debug_parameters_ = parameters;
+
+ update_pending_request();
+ }
+
+ // Numbers of instructions to execute before the debugger shell is given
+ // back control.
+ int64_t steps() const { return steps_; }
+ void set_steps(int64_t value) {
+ VIXL_ASSERT(value > 1);
+ steps_ = value;
+ }
+
+ bool IsDebuggerRunning() const {
+ return (debug_parameters_ & DBG_ACTIVE) != 0;
+ }
+
+ bool pending_request() const { return pending_request_; }
+ void update_pending_request() {
+ pending_request_ = IsDebuggerRunning();
+ }
+
+ void PrintInstructions(const void* address, int64_t count = 1);
+ void PrintMemory(const uint8_t* address,
+ const FormatToken* format,
+ int64_t count = 1);
+ void PrintRegister(const Register& target_reg,
+ const char* name,
+ const FormatToken* format);
+ void PrintFPRegister(const FPRegister& target_fpreg,
+ const FormatToken* format);
+
+ private:
+ char* ReadCommandLine(const char* prompt, char* buffer, int length);
+ void RunDebuggerShell();
+ void DoBreakpoint(const Instruction* instr);
+
+ int debug_parameters_;
+ bool pending_request_;
+ int64_t steps_;
+ DebugCommand* last_command_;
+ PrintDisassembler* disasm_;
+ Decoder* printer_;
+
+ // Length of the biggest command line accepted by the debugger shell.
+ static const int kMaxDebugShellLine = 256;
+};
+
+} // namespace vixl
+
+#endif // VIXL_A64_DEBUGGER_A64_H_
+
+#endif // JS_SIMULATOR_ARM64