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// Copyright 2019 Google

//

// Licensed under the Apache License, Version 2.0 (the "License");

// you may not use this file except in compliance with the License.

// You may obtain a copy of the License at

//

//      http://www.apache.org/licenses/LICENSE-2.0

//

// Unless required by applicable law or agreed to in writing, software

// distributed under the License is distributed on an "AS IS" BASIS,

// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

// See the License for the specific language governing permissions and

// limitations under the License.

#pragma once

#include <stdbool.h>

#include <stdint.h>

#include "Crashlytics/Crashlytics/Helpers/FIRCLSFeatures.h"

#include "Crashlytics/Crashlytics/Helpers/FIRCLSThreadState.h"

// We have to pack the arrays defined in this header, so

// we can reason about pointer math.

#pragma pack(push)

#pragma pack(1)

#include <mach-o/compact_unwind_encoding.h>

#pragma pack(pop)

// First masks out the value, and then shifts the value by the number

// of zeros in the mask. __builtin_ctz returns the number of trailing zeros.

// Its output is undefined if the input is zero.

#define GET_BITS_WITH_MASK(value, mask) ((value & mask) >> (mask == 0 ? 0 : __builtin_ctz(mask)))

typedef struct {

  const void* unwindInfo;

  const void* ehFrame;

  uintptr_t loadAddress;

  struct unwind_info_section_header unwindHeader;

  struct unwind_info_section_header_index_entry indexHeader;

  uint32_t firstLevelNextFunctionOffset;

} FIRCLSCompactUnwindContext;

typedef struct {

  compact_unwind_encoding_t encoding;

  uintptr_t functionStart;

  uintptr_t functionEnd;

  uintptr_t lsda;

  uintptr_t personality;

} FIRCLSCompactUnwindResult;

bool FIRCLSCompactUnwindInit(FIRCLSCompactUnwindContext* context,

                             const void* unwindInfo,

                             const void* ehFrame,

                             uintptr_t loadAddress);

void* FIRCLSCompactUnwindGetIndexData(FIRCLSCompactUnwindContext* context);

void* FIRCLSCompactUnwindGetSecondLevelData(FIRCLSCompactUnwindContext* context);

bool FIRCLSCompactUnwindFindFirstLevelIndex(FIRCLSCompactUnwindContext* context,

                                            uintptr_t pc,

                                            uint32_t* index);

bool FIRCLSCompactUnwindDwarfFrame(FIRCLSCompactUnwindContext* context,

                                   uintptr_t dwarfOffset,

                                   FIRCLSThreadContext* registers);

bool FIRCLSCompactUnwindLookupAndCompute(FIRCLSCompactUnwindContext* context,

                                         FIRCLSThreadContext* registers);