1 files changed, 143 insertions, 0 deletions
diff --git a/js/src/jit/arm/disasm/Disasm-arm.h b/js/src/jit/arm/disasm/Disasm-arm.h
new file mode 100644
index 000000000..5421a03c7
--- /dev/null
+++ b/js/src/jit/arm/disasm/Disasm-arm.h
@@ -0,0 +1,143 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ * vim: set ts=8 sts=4 et sw=4 tw=99:
+ */
+// Copyright 2007-2008 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef jit_arm_disasm_Disasm_arm_h
+#define jit_arm_disasm_Disasm_arm_h
+
+#ifdef JS_DISASM_ARM
+
+#include "mozilla/Assertions.h"
+#include "mozilla/Types.h"
+
+#include <stdio.h>
+
+namespace js {
+namespace jit {
+namespace disasm {
+
+typedef unsigned char byte;
+
+// A reasonable (ie, safe) buffer size for the disassembly of a single instruction.
+const int ReasonableBufferSize = 256;
+
+// Vector as used by the original code to allow for minimal modification.
+// Functions exactly like a character array with helper methods.
+template <typename T>
+class V8Vector {
+  public:
+    V8Vector() : start_(nullptr), length_(0) {}
+    V8Vector(T* data, int length) : start_(data), length_(length) {
+        MOZ_ASSERT(length == 0 || (length > 0 && data != nullptr));
+    }
+
+    // Returns the length of the vector.
+    int length() const { return length_; }
+
+    // Returns the pointer to the start of the data in the vector.
+    T* start() const { return start_; }
+
+    // Access individual vector elements - checks bounds in debug mode.
+    T& operator[](int index) const {
+        MOZ_ASSERT(0 <= index && index < length_);
+        return start_[index];
+    }
+
+    inline V8Vector<T> operator+(int offset) {
+        MOZ_ASSERT(offset < length_);
+        return V8Vector<T>(start_ + offset, length_ - offset);
+    }
+
+  private:
+    T* start_;
+    int length_;
+};
+
+
+template <typename T, int kSize>
+class EmbeddedVector : public V8Vector<T> {
+  public:
+    EmbeddedVector() : V8Vector<T>(buffer_, kSize) { }
+
+    explicit EmbeddedVector(T initial_value) : V8Vector<T>(buffer_, kSize) {
+        for (int i = 0; i < kSize; ++i) {
+            buffer_[i] = initial_value;
+        }
+    }
+
+    // When copying, make underlying Vector to reference our buffer.
+    EmbeddedVector(const EmbeddedVector& rhs)
+        : V8Vector<T>(rhs) {
+        MemCopy(buffer_, rhs.buffer_, sizeof(T) * kSize);
+        this->set_start(buffer_);
+    }
+
+    EmbeddedVector& operator=(const EmbeddedVector& rhs) {
+        if (this == &rhs) return *this;
+        V8Vector<T>::operator=(rhs);
+        MemCopy(buffer_, rhs.buffer_, sizeof(T) * kSize);
+        this->set_start(buffer_);
+        return *this;
+    }
+
+  private:
+    T buffer_[kSize];
+};
+
+
+// Interface and default implementation for converting addresses and
+// register-numbers to text.  The default implementation is machine
+// specific.
+class NameConverter {
+  public:
+    virtual ~NameConverter() {}
+    virtual const char* NameOfCPURegister(int reg) const;
+    virtual const char* NameOfByteCPURegister(int reg) const;
+    virtual const char* NameOfXMMRegister(int reg) const;
+    virtual const char* NameOfAddress(byte* addr) const;
+    virtual const char* NameOfConstant(byte* addr) const;
+    virtual const char* NameInCode(byte* addr) const;
+
+  protected:
+    EmbeddedVector<char, 128> tmp_buffer_;
+};
+
+
+// A generic Disassembler interface
+class Disassembler {
+  public:
+    // Caller deallocates converter.
+    explicit Disassembler(const NameConverter& converter);
+
+    virtual ~Disassembler();
+
+    // Writes one disassembled instruction into 'buffer' (0-terminated).
+    // Returns the length of the disassembled machine instruction in bytes.
+    int InstructionDecode(V8Vector<char> buffer, uint8_t* instruction);
+
+    // Returns -1 if instruction does not mark the beginning of a constant pool,
+    // or the number of entries in the constant pool beginning here.
+    int ConstantPoolSizeAt(byte* instruction);
+
+    // Write disassembly into specified file 'f' using specified NameConverter
+    // (see constructor).
+    static void Disassemble(FILE* f, uint8_t* begin, uint8_t* end);
+  private:
+    const NameConverter& converter_;
+
+    // Disallow implicit constructors.
+    Disassembler() = delete;
+    Disassembler(const Disassembler&) = delete;
+    void operator=(const Disassembler&) = delete;
+};
+
+}  // namespace disasm
+}  // namespace jit
+}  // namespace js
+
+#endif // JS_DISASM_ARM
+
+#endif  // jit_arm_disasm_Disasm_arm_h