Courgette: Add static method QuickDetect() to optimize program detection.

courgette/disassembler_elf_32_arm.h

 // Copyright 2013 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.
 
 #ifndef COURGETTE_DISASSEMBLER_ELF_32_ARM_H_
 #define COURGETTE_DISASSEMBLER_ELF_32_ARM_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 10 matching lines @@
 enum ARM_RVA {
   ARM_OFF8,
   ARM_OFF11,
   ARM_OFF24,
   ARM_OFF25,
   ARM_OFF21,
 };
 
 class DisassemblerElf32ARM : public DisassemblerElf32 {
  public:
+  static bool QuickDetects(const void* start, size_t length) {
+    return DisassemblerElf32::QuickDetects(
+        reinterpret_cast<const uint8_t*>(start), length, EM_ARM);
+  }
+
   class TypedRVAARM : public TypedRVA {
    public:
     TypedRVAARM(ARM_RVA type, RVA rva) : TypedRVA(rva), type_(type) { }
     ~TypedRVAARM() override { }
 
     // TypedRVA interfaces.
     CheckBool ComputeRelativeTarget(const uint8_t* op_pointer) override;
     CheckBool EmitInstruction(AssemblyProgram* program,
                               Label* label) override;
     uint16_t op_size() const override;
@@ skipping 48 matching lines @@
 #if COURGETTE_HISTOGRAM_TARGETS
   std::map<RVA, int> rel32_target_rvas_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(DisassemblerElf32ARM);
 };
 
 }  // namespace courgette
 
 #endif  // COURGETTE_DISASSEMBLER_ELF_32_ARM_H_