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am 0cf5d96c: am 237fdb4a: am eb8d73b6: Merge "Rewrite libbacktrace to be all C++."

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* commit '0cf5d96c43a11e150941202961bcedcbce9bb294':
  Rewrite libbacktrace to be all C++.
This commit is contained in:
Christopher Ferris 2014-01-17 19:26:16 +00:00 committed by Android Git Automerger
commit 47fa90641e
20 changed files with 603 additions and 707 deletions
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78
debuggerd/tombstone.cpp
View file

@ -33,6 +33,7 @@
#include <cutils/properties.h>
#include <backtrace/Backtrace.h>
#include <backtrace/BacktraceMap.h>
#include <sys/socket.h>
#include <linux/un.h>
@ -230,9 +231,12 @@ static void dump_stack_segment(
break;
}
const char* map_name = backtrace->GetMapName(stack_content, NULL);
if (!map_name) {
const backtrace_map_t* map = backtrace->FindMap(stack_content);
const char* map_name;
if (!map) {
map_name = "";
} else {
map_name = map->name.c_str();
}
uintptr_t offset = 0;
std::string func_name(backtrace->GetFunctionName(stack_content, &offset));
@ -328,17 +332,17 @@ static void dump_backtrace_and_stack(Backtrace* backtrace, log_t* log, int scope
}
}
static void dump_map(log_t* log, const backtrace_map_info_t* m, const char* what, int scope_flags) {
if (m != NULL) {
_LOG(log, scope_flags, " %08x-%08x %c%c%c %s\n", m->start, m->end,
m->is_readable ? 'r' : '-', m->is_writable ? 'w' : '-',
m->is_executable ? 'x' : '-', m->name);
static void dump_map(log_t* log, const backtrace_map_t* map, const char* what, int scope_flags) {
if (map != NULL) {
_LOG(log, scope_flags, " %08x-%08x %c%c%c %s\n", map->start, map->end,
(map->flags & PROT_READ) ? 'r' : '-', (map->flags & PROT_WRITE) ? 'w' : '-',
(map->flags & PROT_EXEC) ? 'x' : '-', map->name.c_str());
} else {
_LOG(log, scope_flags, " (no %s)\n", what);
}
}
static void dump_nearby_maps(const backtrace_map_info_t* map_info_list, log_t* log, pid_t tid, int scope_flags) {
static void dump_nearby_maps(BacktraceMap* map, log_t* log, pid_t tid, int scope_flags) {
scope_flags |= SCOPE_SENSITIVE;
siginfo_t si;
memset(&si, 0, sizeof(si));
@ -350,7 +354,7 @@ static void dump_nearby_maps(const backtrace_map_info_t* map_info_list, log_t* l
return;
}
uintptr_t addr = (uintptr_t) si.si_addr;
uintptr_t addr = reinterpret_cast<uintptr_t>(si.si_addr);
addr &= ~0xfff; // round to 4K page boundary
if (addr == 0) { // null-pointer deref
return;
@ -361,29 +365,26 @@ static void dump_nearby_maps(const backtrace_map_info_t* map_info_list, log_t* l
// Search for a match, or for a hole where the match would be. The list
// is backward from the file content, so it starts at high addresses.
const backtrace_map_info_t* map = map_info_list;
const backtrace_map_info_t* next = NULL;
const backtrace_map_info_t* prev = NULL;
while (map != NULL) {
if (addr >= map->start && addr < map->end) {
next = map->next;
break;
} else if (addr >= map->end) {
// map would be between "prev" and this entry
next = map;
map = NULL;
const backtrace_map_t* cur_map = NULL;
const backtrace_map_t* next_map = NULL;
const backtrace_map_t* prev_map = NULL;
for (BacktraceMap::const_iterator it = map->begin(); it != map->end(); ++it) {
if (addr >= it->start && addr < it->end) {
cur_map = &*it;
if (it != map->begin()) {
prev_map = &*(it-1);
}
if (++it != map->end()) {
next_map = &*it;
}
break;
}
prev = map;
map = map->next;
}
// Show "next" then "match" then "prev" so that the addresses appear in
// ascending order (like /proc/pid/maps).
dump_map(log, next, "map below", scope_flags);
dump_map(log, map, "map for address", scope_flags);
dump_map(log, prev, "map above", scope_flags);
// Show the map address in ascending order (like /proc/pid/maps).
dump_map(log, prev_map, "map below", scope_flags);
dump_map(log, cur_map, "map for address", scope_flags);
dump_map(log, next_map, "map above", scope_flags);
}
static void dump_thread(
@ -394,13 +395,13 @@ static void dump_thread(
dump_backtrace_and_stack(backtrace, log, scope_flags);
if (IS_AT_FAULT(scope_flags)) {
dump_memory_and_code(log, backtrace->Tid(), scope_flags);
dump_nearby_maps(backtrace->GetMapList(), log, backtrace->Tid(), scope_flags);
dump_nearby_maps(backtrace->GetMap(), log, backtrace->Tid(), scope_flags);
}
}
// Return true if some thread is not detached cleanly
static bool dump_sibling_thread_report(
log_t* log, pid_t pid, pid_t tid, int* total_sleep_time_usec, backtrace_map_info_t* map_info) {
log_t* log, pid_t pid, pid_t tid, int* total_sleep_time_usec, BacktraceMap* map) {
char task_path[64];
snprintf(task_path, sizeof(task_path), "/proc/%d/task", pid);
@ -434,7 +435,7 @@ static bool dump_sibling_thread_report(
_LOG(log, 0, "--- --- --- --- --- --- --- --- --- --- --- --- --- --- --- ---\n");
dump_thread_info(log, pid, new_tid, 0);
UniquePtr<Backtrace> backtrace(Backtrace::Create(pid, new_tid, map_info));
UniquePtr<Backtrace> backtrace(Backtrace::Create(pid, new_tid, map));
if (backtrace->Unwind(0)) {
dump_thread(backtrace.get(), log, 0, total_sleep_time_usec);
}
@ -637,11 +638,12 @@ static bool dump_crash(log_t* log, pid_t pid, pid_t tid, int signal, uintptr_t a
dump_fault_addr(log, tid, signal);
}
// Gather the map info once for all this process' threads.
backtrace_map_info_t* map_info = backtrace_create_map_info_list(pid);
UniquePtr<Backtrace> backtrace(Backtrace::Create(pid, tid, map_info));
BacktraceMap* map = NULL;
UniquePtr<Backtrace> backtrace(Backtrace::Create(pid, tid));
if (backtrace->Unwind(0)) {
// Grab the map that was created and share it with the siblings.
map = backtrace->TakeMapOwnership();
dump_abort_message(backtrace.get(), log, abort_msg_address);
dump_thread(backtrace.get(), log, SCOPE_AT_FAULT, total_sleep_time_usec);
}
@ -652,11 +654,11 @@ static bool dump_crash(log_t* log, pid_t pid, pid_t tid, int signal, uintptr_t a
bool detach_failed = false;
if (dump_sibling_threads) {
detach_failed = dump_sibling_thread_report(log, pid, tid, total_sleep_time_usec, map_info);
detach_failed = dump_sibling_thread_report(log, pid, tid, total_sleep_time_usec, map);
}
// Destroy the previously created map info.
backtrace_destroy_map_info_list(map_info);
// Destroy the BacktraceMap object.
delete map;
if (want_logs) {
dump_logs(log, pid, false);

76
include/backtrace/Backtrace.h
View file

@ -17,10 +17,25 @@
#ifndef _BACKTRACE_BACKTRACE_H
#define _BACKTRACE_BACKTRACE_H
#include <backtrace/backtrace.h>
#include <stdint.h>
#include <string>
#include <vector>
#include <backtrace/backtrace_constants.h>
#include <backtrace/BacktraceMap.h>
struct backtrace_frame_data_t {
size_t num; // The current fame number.
uintptr_t pc; // The absolute pc.
uintptr_t sp; // The top of the stack.
size_t stack_size; // The size of the stack, zero indicate an unknown stack size.
const backtrace_map_t* map; // The map associated with the given pc.
std::string func_name; // The function name associated with this pc, NULL if not found.
uintptr_t func_offset; // pc relative to the start of the function, only valid if func_name is not NULL.
};
// Forward declarations.
class BacktraceImpl;
class Backtrace {
@ -33,9 +48,9 @@ public:
// If pid >= 0 and tid < 0, then the Backtrace object corresponds to a
// different process.
// Tracing a thread in a different process is not supported.
// If map_info is NULL, then create the map and manage it internally.
// If map_info is not NULL, the map is still owned by the caller.
static Backtrace* Create(pid_t pid, pid_t tid, backtrace_map_info_t* map_info = NULL);
// If map is NULL, then create the map and manage it internally.
// If map is not NULL, the map is still owned by the caller.
static Backtrace* Create(pid_t pid, pid_t tid, BacktraceMap* map = NULL);
virtual ~Backtrace();
@ -46,13 +61,12 @@ public:
// If the string is empty, then no valid function name was found.
virtual std::string GetFunctionName(uintptr_t pc, uintptr_t* offset);
// Get the name of the map associated with the given pc. If NULL is returned,
// then map_start is not set. Otherwise, map_start is the beginning of this
// map.
virtual const char* GetMapName(uintptr_t pc, uintptr_t* map_start);
// Find the map associated with the given pc.
virtual const backtrace_map_t* FindMap(uintptr_t pc);
// Finds the memory map associated with the given ptr.
virtual const backtrace_map_info_t* FindMapInfo(uintptr_t ptr);
// Take ownership of the BacktraceMap object associated with the backtrace.
// If this is called, the caller must handle deleting the object themselves.
virtual BacktraceMap* TakeMapOwnership();
// Read the data at a specific address.
virtual bool ReadWord(uintptr_t ptr, uint32_t* out_value) = 0;
@ -62,36 +76,44 @@ public:
virtual std::string FormatFrameData(size_t frame_num);
virtual std::string FormatFrameData(const backtrace_frame_data_t* frame);
pid_t Pid() { return backtrace_.pid; }
pid_t Tid() { return backtrace_.tid; }
size_t NumFrames() { return backtrace_.num_frames; }
const backtrace_t* GetBacktrace() { return &backtrace_; }
pid_t Pid() { return pid_; }
pid_t Tid() { return tid_; }
size_t NumFrames() { return frames_.size(); }
const backtrace_frame_data_t* GetFrame(size_t frame_num) {
if (frame_num > NumFrames()) {
if (frame_num >= frames_.size()) {
return NULL;
}
return &backtrace_.frames[frame_num];
return &frames_[frame_num];
}
const backtrace_map_info_t* GetMapList() {
return map_info_;
}
typedef std::vector<backtrace_frame_data_t>::iterator iterator;
iterator begin() { return frames_.begin(); }
iterator end() { return frames_.end(); }
typedef std::vector<backtrace_frame_data_t>::const_iterator const_iterator;
const_iterator begin() const { return frames_.begin(); }
const_iterator end() const { return frames_.end(); }
BacktraceMap* GetMap() { return map_; }
protected:
Backtrace(BacktraceImpl* impl, pid_t pid, backtrace_map_info_t* map_info);
Backtrace(BacktraceImpl* impl, pid_t pid, BacktraceMap* map);
virtual bool VerifyReadWordArgs(uintptr_t ptr, uint32_t* out_value);
bool BuildMap();
pid_t pid_;
pid_t tid_;
BacktraceMap* map_;
bool map_shared_;
std::vector<backtrace_frame_data_t> frames_;
BacktraceImpl* impl_;
backtrace_map_info_t* map_info_;
bool map_info_requires_delete_;
backtrace_t backtrace_;
friend class BacktraceImpl;
};

72
include/backtrace/BacktraceMap.h Normal file
View file

@ -0,0 +1,72 @@
/*
* Copyright (C) 2014 The Android Open Source Project
*
* 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.
*/
#ifndef _BACKTRACE_BACKTRACE_MAP_H
#define _BACKTRACE_BACKTRACE_MAP_H
#include <stdint.h>
#include <sys/mman.h>
#include <string>
#include <vector>
struct backtrace_map_t {
uintptr_t start;
uintptr_t end;
int flags;
std::string name;
};
class BacktraceMap {
public:
BacktraceMap(pid_t pid);
virtual ~BacktraceMap();
// Get the map data structure for the given address.
const backtrace_map_t* Find(uintptr_t addr);
// The flags returned are the same flags as used by the mmap call.
// The values are PROT_*.
int GetFlags(uintptr_t pc) {
const backtrace_map_t* map = Find(pc);
if (map) {
return map->flags;
}
return PROT_NONE;
}
bool IsReadable(uintptr_t pc) { return GetFlags(pc) & PROT_READ; }
bool IsWritable(uintptr_t pc) { return GetFlags(pc) & PROT_WRITE; }
bool IsExecutable(uintptr_t pc) { return GetFlags(pc) & PROT_EXEC; }
typedef std::vector<backtrace_map_t>::iterator iterator;
iterator begin() { return maps_.begin(); }
iterator end() { return maps_.end(); }
typedef std::vector<backtrace_map_t>::const_iterator const_iterator;
const_iterator begin() const { return maps_.begin(); }
const_iterator end() const { return maps_.end(); }
virtual bool Build();
protected:
virtual bool ParseLine(const char* line, backtrace_map_t* map);
std::vector<backtrace_map_t> maps_;
pid_t pid_;
};
#endif // _BACKTRACE_BACKTRACE_MAP_H

131
include/backtrace/backtrace.h
View file

@ -1,131 +0,0 @@
/*
* Copyright (C) 2013 The Android Open Source Project
*
* 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.
*/
#ifndef _BACKTRACE_H
#define _BACKTRACE_H
#include <stdint.h>
#include <stdbool.h>
#include <sys/types.h>
__BEGIN_DECLS
// When the pid to be traced is set to this value, then trace the current
// process. If the tid value is not BACKTRACE_NO_TID, then the specified
// thread from the current process will be traced.
#define BACKTRACE_CURRENT_PROCESS -1
// When the tid to be traced is set to this value, then trace the specified
// current thread of the specified pid.
#define BACKTRACE_CURRENT_THREAD -1
#define MAX_BACKTRACE_FRAMES 64
typedef struct backtrace_map_info {
struct backtrace_map_info* next;
uintptr_t start;
uintptr_t end;
bool is_readable;
bool is_writable;
bool is_executable;
char name[];
} backtrace_map_info_t;
typedef struct {
size_t num; /* The current fame number. */
uintptr_t pc; /* The absolute pc. */
uintptr_t sp; /* The top of the stack. */
size_t stack_size; /* The size of the stack, zero indicate an unknown stack size. */
const char* map_name; /* The name of the map to which this pc belongs, NULL indicates the pc doesn't belong to a known map. */
uintptr_t map_offset; /* pc relative to the start of the map, only valid if map_name is not NULL. */
char* func_name; /* The function name associated with this pc, NULL if not found. */
uintptr_t func_offset; /* pc relative to the start of the function, only valid if func_name is not NULL. */
} backtrace_frame_data_t;
typedef struct {
backtrace_frame_data_t frames[MAX_BACKTRACE_FRAMES];
size_t num_frames;
pid_t pid;
pid_t tid;
backtrace_map_info_t* map_info_list;
} backtrace_t;
typedef struct {
void* data;
const backtrace_t* backtrace;
} backtrace_context_t;
/* Create a context for the backtrace data and gather the backtrace.
* If pid < 0, then gather the backtrace for the current process.
*/
bool backtrace_create_context(
backtrace_context_t* context, pid_t pid, pid_t tid, size_t num_ignore_frames);
/* The same as backtrace_create_context, except that it is assumed that
* the pid map has already been acquired and the caller will handle freeing
* the map data.
*/
bool backtrace_create_context_with_map(
backtrace_context_t* context, pid_t pid, pid_t tid, size_t num_ignore_frames,
backtrace_map_info_t* map_info);
/* Gather the backtrace data for a pthread instead of a process. */
bool backtrace_create_thread_context(
backtrace_context_t* context, pid_t tid, size_t num_ignore_frames);
/* Free any memory allocated during the context create. */
void backtrace_destroy_context(backtrace_context_t* context);
/* Read data at a specific address for a process. */
bool backtrace_read_word(
const backtrace_context_t* context, uintptr_t ptr, uint32_t* value);
/* Get information about the map name associated with a pc. If NULL is
* returned, then map_start is not set.
*/
const char* backtrace_get_map_name(
const backtrace_context_t* context, uintptr_t pc, uintptr_t* map_start);
/* Get the function name and offset given the pc. If NULL is returned,
* then func_offset is not set. The returned string is allocated using
* malloc and must be freed by the caller.
*/
char* backtrace_get_func_name(
const backtrace_context_t* context, uintptr_t pc, uintptr_t* func_offset);
/* Loads memory map from /proc/<pid>/maps. If pid < 0, then load the memory
* map for the current process.
*/
backtrace_map_info_t* backtrace_create_map_info_list(pid_t pid);
/* Frees memory associated with the map list. */
void backtrace_destroy_map_info_list(backtrace_map_info_t* map_info_list);
/* Finds the memory map that contains the specified pc. */
const backtrace_map_info_t* backtrace_find_map_info(
const backtrace_map_info_t* map_info_list, uintptr_t pc);
/* Create a formatted line of backtrace information for a single frame. */
void backtrace_format_frame_data(
const backtrace_context_t* context, size_t frame_num, char* buf,
size_t buf_size);
/* Get the backtrace data structure associated with the context. */
const backtrace_t* backtrace_get_data(backtrace_context_t* context);
__END_DECLS
#endif /* _BACKTRACE_H */

30
include/backtrace/backtrace_constants.h Normal file
View file

@ -0,0 +1,30 @@
/*
* Copyright (C) 2014 The Android Open Source Project
*
* 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.
*/
#ifndef _BACKTRACE_BACKTRACE_CONSTANTS_H
#define _BACKTRACE_BACKTRACE_CONSTANTS_H
// When the pid to be traced is set to this value, then trace the current
// process. If the tid value is not BACKTRACE_NO_TID, then the specified
// thread from the current process will be traced.
#define BACKTRACE_CURRENT_PROCESS -1
// When the tid to be traced is set to this value, then trace the specified
// current thread of the specified pid.
#define BACKTRACE_CURRENT_THREAD -1
#define MAX_BACKTRACE_FRAMES 64
#endif // _BACKTRACE_BACKTRACE_CONSTANTS_H

2
include/utils/CallStack.h
View file

@ -18,7 +18,7 @@
#define ANDROID_CALLSTACK_H
#include <android/log.h>
#include <backtrace/backtrace.h>
#include <backtrace/backtrace_constants.h>
#include <utils/String8.h>
#include <utils/Vector.h>

4
libbacktrace/Android.mk
View file

@ -2,8 +2,8 @@ LOCAL_PATH:= $(call my-dir)
common_src := \
Backtrace.cpp \
BacktraceMap.cpp \
BacktraceThread.cpp \
map_info.c \
thread_utils.c \
common_cflags := \
@ -222,7 +222,7 @@ LOCAL_LDLIBS += \
else
LOCAL_SRC_FILES += \
map_info.c \
BacktraceMap.cpp \
endif

208
libbacktrace/Backtrace.cpp
View file

@ -27,46 +27,28 @@
#include <string>
#include <backtrace/Backtrace.h>
#include <cutils/log.h>
#include <backtrace/BacktraceMap.h>
#include "Backtrace.h"
#include "thread_utils.h"
//-------------------------------------------------------------------------
// BacktraceImpl functions.
//-------------------------------------------------------------------------
backtrace_t* BacktraceImpl::GetBacktraceData() {
return &backtrace_obj_->backtrace_;
}
//-------------------------------------------------------------------------
// Backtrace functions.
//-------------------------------------------------------------------------
Backtrace::Backtrace(BacktraceImpl* impl, pid_t pid, backtrace_map_info_t* map_info)
: impl_(impl), map_info_(map_info), map_info_requires_delete_(false) {
Backtrace::Backtrace(BacktraceImpl* impl, pid_t pid, BacktraceMap* map)
: pid_(pid), tid_(-1), map_(map), map_shared_(true), impl_(impl) {
impl_->SetParent(this);
backtrace_.num_frames = 0;
backtrace_.pid = pid;
backtrace_.tid = -1;
if (map_info_ == NULL) {
// Create the map and manage it internally.
map_info_ = backtrace_create_map_info_list(pid);
map_info_requires_delete_ = true;
if (map_ == NULL) {
// The map will be created when needed.
map_shared_ = false;
}
}
Backtrace::~Backtrace() {
for (size_t i = 0; i < NumFrames(); i++) {
if (backtrace_.frames[i].func_name) {
free(backtrace_.frames[i].func_name);
backtrace_.frames[i].func_name = NULL;
}
}
if (map_info_ && map_info_requires_delete_) {
backtrace_destroy_map_info_list(map_info_);
map_info_ = NULL;
if (map_ && !map_shared_) {
delete map_;
map_ = NULL;
}
if (impl_) {
@ -109,47 +91,36 @@ bool Backtrace::VerifyReadWordArgs(uintptr_t ptr, uint32_t* out_value) {
return true;
}
const char* Backtrace::GetMapName(uintptr_t pc, uintptr_t* map_start) {
const backtrace_map_info_t* map_info = FindMapInfo(pc);
if (map_info) {
if (map_start) {
*map_start = map_info->start;
}
return map_info->name;
}
return NULL;
}
const backtrace_map_info_t* Backtrace::FindMapInfo(uintptr_t ptr) {
return backtrace_find_map_info(map_info_, ptr);
}
std::string Backtrace::FormatFrameData(size_t frame_num) {
return FormatFrameData(&backtrace_.frames[frame_num]);
if (frame_num >= frames_.size()) {
return "";
}
return FormatFrameData(&frames_[frame_num]);
}
std::string Backtrace::FormatFrameData(const backtrace_frame_data_t* frame) {
const char* map_name;
if (frame->map_name) {
map_name = frame->map_name;
if (frame->map && !frame->map->name.empty()) {
map_name = frame->map->name.c_str();
} else {
map_name = "<unknown>";
}
uintptr_t relative_pc;
if (frame->map_offset) {
relative_pc = frame->map_offset;
if (frame->map) {
relative_pc = frame->pc - frame->map->start;
} else {
relative_pc = frame->pc;
}
char buf[512];
if (frame->func_name && frame->func_offset) {
if (!frame->func_name.empty() && frame->func_offset) {
snprintf(buf, sizeof(buf), "#%02zu pc %0*" PRIxPTR " %s (%s+%" PRIuPTR ")",
frame->num, (int)sizeof(uintptr_t)*2, relative_pc, map_name,
frame->func_name, frame->func_offset);
} else if (frame->func_name) {
frame->func_name.c_str(), frame->func_offset);
} else if (!frame->func_name.empty()) {
snprintf(buf, sizeof(buf), "#%02zu pc %0*" PRIxPTR " %s (%s)", frame->num,
(int)sizeof(uintptr_t)*2, relative_pc, map_name, frame->func_name);
(int)sizeof(uintptr_t)*2, relative_pc, map_name, frame->func_name.c_str());
} else {
snprintf(buf, sizeof(buf), "#%02zu pc %0*" PRIxPTR " %s", frame->num,
(int)sizeof(uintptr_t)*2, relative_pc, map_name);
@ -158,13 +129,35 @@ std::string Backtrace::FormatFrameData(const backtrace_frame_data_t* frame) {
return buf;
}
bool Backtrace::BuildMap() {
map_ = impl_->CreateBacktraceMap(pid_);
if (!map_->Build()) {
BACK_LOGW("Failed to build map for process %d", pid_);
return false;
}
return true;
}
const backtrace_map_t* Backtrace::FindMap(uintptr_t pc) {
if (map_ == NULL) {
// Lazy eval, time to build the map.
if (!BuildMap()) {
return NULL;
}
}
return map_->Find(pc);
}
BacktraceMap* Backtrace::TakeMapOwnership() {
map_shared_ = true;
return map_;
}
//-------------------------------------------------------------------------
// BacktraceCurrent functions.
//-------------------------------------------------------------------------
BacktraceCurrent::BacktraceCurrent(
BacktraceImpl* impl, backtrace_map_info_t *map_info) : Backtrace(impl, getpid(), map_info) {
backtrace_.pid = getpid();
BacktraceImpl* impl, BacktraceMap* map) : Backtrace(impl, getpid(), map) {
}
BacktraceCurrent::~BacktraceCurrent() {
@ -175,8 +168,8 @@ bool BacktraceCurrent::ReadWord(uintptr_t ptr, uint32_t* out_value) {
return false;
}
const backtrace_map_info_t* map_info = FindMapInfo(ptr);
if (map_info && map_info->is_readable) {
const backtrace_map_t* map = FindMap(ptr);
if (map && map->flags & PROT_READ) {
*out_value = *reinterpret_cast<uint32_t*>(ptr);
return true;
} else {
@ -190,9 +183,9 @@ bool BacktraceCurrent::ReadWord(uintptr_t ptr, uint32_t* out_value) {
// BacktracePtrace functions.
//-------------------------------------------------------------------------
BacktracePtrace::BacktracePtrace(
BacktraceImpl* impl, pid_t pid, pid_t tid, backtrace_map_info_t* map_info)
: Backtrace(impl, pid, map_info) {
backtrace_.tid = tid;
BacktraceImpl* impl, pid_t pid, pid_t tid, BacktraceMap* map)
: Backtrace(impl, pid, map) {
tid_ = tid;
}
BacktracePtrace::~BacktracePtrace() {
@ -220,103 +213,16 @@ bool BacktracePtrace::ReadWord(uintptr_t ptr, uint32_t* out_value) {
#endif
}
Backtrace* Backtrace::Create(pid_t pid, pid_t tid, backtrace_map_info_t* map_info) {
Backtrace* Backtrace::Create(pid_t pid, pid_t tid, BacktraceMap* map) {
if (pid == BACKTRACE_CURRENT_PROCESS || pid == getpid()) {
if (tid == BACKTRACE_CURRENT_THREAD || tid == gettid()) {
return CreateCurrentObj(map_info);
return CreateCurrentObj(map);
} else {
return CreateThreadObj(tid, map_info);
return CreateThreadObj(tid, map);
}
} else if (tid == BACKTRACE_CURRENT_THREAD) {
return CreatePtraceObj(pid, pid, map_info);
return CreatePtraceObj(pid, pid, map);
} else {
return CreatePtraceObj(pid, tid, map_info);
}
}
//-------------------------------------------------------------------------
// Common interface functions.
//-------------------------------------------------------------------------
bool backtrace_create_context_with_map(
backtrace_context_t* context, pid_t pid, pid_t tid, size_t num_ignore_frames,
backtrace_map_info_t* map_info) {
Backtrace* backtrace = Backtrace::Create(pid, tid, map_info);
if (!backtrace) {
return false;
}
if (!backtrace->Unwind(num_ignore_frames)) {
delete backtrace;
return false;
}
context->data = backtrace;
context->backtrace = backtrace->GetBacktrace();
return true;
}
bool backtrace_create_context(
backtrace_context_t* context, pid_t pid, pid_t tid, size_t num_ignore_frames) {
return backtrace_create_context_with_map(context, pid, tid, num_ignore_frames, NULL);
}
void backtrace_destroy_context(backtrace_context_t* context) {
if (context->data) {
Backtrace* backtrace = reinterpret_cast<Backtrace*>(context->data);
delete backtrace;
context->data = NULL;
}
context->backtrace = NULL;
}
const backtrace_t* backtrace_get_data(backtrace_context_t* context) {
if (context && context->data) {
Backtrace* backtrace = reinterpret_cast<Backtrace*>(context->data);
return backtrace->GetBacktrace();
}
return NULL;
}
bool backtrace_read_word(const backtrace_context_t* context, uintptr_t ptr, uint32_t* value) {
if (context->data) {
Backtrace* backtrace = reinterpret_cast<Backtrace*>(context->data);
return backtrace->ReadWord(ptr, value);
}
return true;
}
const char* backtrace_get_map_name(const backtrace_context_t* context, uintptr_t pc, uintptr_t* map_start) {
if (context->data) {
Backtrace* backtrace = reinterpret_cast<Backtrace*>(context->data);
return backtrace->GetMapName(pc, map_start);
}
return NULL;
}
char* backtrace_get_func_name(const backtrace_context_t* context, uintptr_t pc, uintptr_t* func_offset) {
if (context->data) {
Backtrace* backtrace = reinterpret_cast<Backtrace*>(context->data);
std::string func_name = backtrace->GetFunctionName(pc, func_offset);
if (!func_name.empty()) {
return strdup(func_name.c_str());
}
}
return NULL;
}
void backtrace_format_frame_data(
const backtrace_context_t* context, size_t frame_num, char* buf,
size_t buf_size) {
if (buf_size == 0 || buf == NULL) {
BACK_LOGW("bad call buf %p buf_size %zu", buf, buf_size);
} else if (context->data) {
Backtrace* backtrace = reinterpret_cast<Backtrace*>(context->data);
std::string line = backtrace->FormatFrameData(frame_num);
if (line.size() > buf_size) {
memcpy(buf, line.c_str(), buf_size-1);
buf[buf_size] = '\0';
} else {
memcpy(buf, line.c_str(), line.size()+1);
}
return CreatePtraceObj(pid, tid, map);
}
}

18
libbacktrace/Backtrace.h
View file

@ -18,8 +18,10 @@
#define _LIBBACKTRACE_BACKTRACE_H
#include <backtrace/Backtrace.h>
#include <backtrace/BacktraceMap.h>
#include <sys/types.h>
#include <log/log.h>
// Macro to log the function name along with the warning message.
#define BACK_LOGW(format, ...) \
@ -37,15 +39,19 @@ public:
void SetParent(Backtrace* backtrace) { backtrace_obj_ = backtrace; }
virtual BacktraceMap* CreateBacktraceMap(pid_t pid) = 0;
protected:
backtrace_t* GetBacktraceData();
inline std::vector<backtrace_frame_data_t>* GetFrames() { return &backtrace_obj_->frames_; }
inline bool BuildMap() { return backtrace_obj_->BuildMap(); }
Backtrace* backtrace_obj_;
};
class BacktraceCurrent : public Backtrace {
public:
BacktraceCurrent(BacktraceImpl* impl, backtrace_map_info_t* map_info);
BacktraceCurrent(BacktraceImpl* impl, BacktraceMap* map);
virtual ~BacktraceCurrent();
bool ReadWord(uintptr_t ptr, uint32_t* out_value);
@ -53,14 +59,14 @@ public:
class BacktracePtrace : public Backtrace {
public:
BacktracePtrace(BacktraceImpl* impl, pid_t pid, pid_t tid, backtrace_map_info_t* map_info);
BacktracePtrace(BacktraceImpl* impl, pid_t pid, pid_t tid, BacktraceMap* map);
virtual ~BacktracePtrace();
bool ReadWord(uintptr_t ptr, uint32_t* out_value);
};
Backtrace* CreateCurrentObj(backtrace_map_info_t* map_info);
Backtrace* CreatePtraceObj(pid_t pid, pid_t tid, backtrace_map_info_t* map_info);
Backtrace* CreateThreadObj(pid_t tid, backtrace_map_info_t* map_info);
Backtrace* CreateCurrentObj(BacktraceMap* map);
Backtrace* CreatePtraceObj(pid_t pid, pid_t tid, BacktraceMap* map);
Backtrace* CreateThreadObj(pid_t tid, BacktraceMap* map);
#endif // _LIBBACKTRACE_BACKTRACE_H

130
libbacktrace/BacktraceMap.cpp Normal file
View file

@ -0,0 +1,130 @@
/*
* Copyright (C) 2014 The Android Open Source Project
*
* 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.
*/
#include <ctype.h>
#include <sys/types.h>
#include <unistd.h>
#include <string>
#include <vector>
#include <backtrace/BacktraceMap.h>
#include <log/log.h>
BacktraceMap::BacktraceMap(pid_t pid) : pid_(pid) {
if (pid_ < 0) {
pid_ = getpid();
}
}
BacktraceMap::~BacktraceMap() {
}
const backtrace_map_t* BacktraceMap::Find(uintptr_t addr) {
for (BacktraceMap::const_iterator it = begin();
it != end(); ++it) {
if (addr >= it->start && addr < it->end) {
return &*it;
}
}
return NULL;
}
bool BacktraceMap::ParseLine(const char* line, backtrace_map_t* map) {
unsigned long int start;
unsigned long int end;
char permissions[5];
int name_pos;
#if defined(__APPLE__)
// Mac OS vmmap(1) output:
// __TEXT 0009f000-000a1000 [ 8K 8K] r-x/rwx SM=COW /Volumes/android/dalvik-dev/out/host/darwin-x86/bin/libcorkscrew_test\n
// 012345678901234567890123456789012345678901234567890123456789
// 0 1 2 3 4 5
if (sscanf(line, "%*21c %lx-%lx [%*13c] %3c/%*3c SM=%*3c %n",
&start, &end, permissions, &name_pos) != 3) {
#else
// Linux /proc/<pid>/maps lines:
// 6f000000-6f01e000 rwxp 00000000 00:0c 16389419 /system/lib/libcomposer.so\n
// 012345678901234567890123456789012345678901234567890123456789
// 0 1 2 3 4 5
if (sscanf(line, "%lx-%lx %4s %*x %*x:%*x %*d%n",
&start, &end, permissions, &name_pos) != 3) {
#endif
return false;
}
map->start = start;
map->end = end;
map->flags = PROT_NONE;
if (permissions[0] == 'r') {
map->flags |= PROT_READ;
}
if (permissions[1] == 'w') {
map->flags |= PROT_WRITE;
}
if (permissions[2] == 'x') {
map->flags |= PROT_EXEC;
}
while (isspace(line[name_pos])) {
name_pos += 1;
}
map->name = line+name_pos;
if (!map->name.empty() && map->name[map->name.length()-1] == '\n') {
map->name.erase(map->name.length()-1);
}
ALOGV("Parsed map: start=%p, end=%p, flags=%x, name=%s",
map->start, map->end, map->flags, map->name.c_str());
return true;
}
bool BacktraceMap::Build() {
#if defined(__APPLE__)
char cmd[sizeof(pid_t)*3 + sizeof("vmmap -w -resident -submap -allSplitLibs -interleaved ") + 1];
#else
char path[sizeof(pid_t)*3 + sizeof("/proc//maps") + 1];
#endif
char line[1024];
#if defined(__APPLE__)
// cmd is guaranteed to always be big enough to hold this string.
sprintf(cmd, "vmmap -w -resident -submap -allSplitLibs -interleaved %d", pid);
FILE* fp = popen(cmd, "r");
#else
// path is guaranteed to always be big enough to hold this string.
sprintf(path, "/proc/%d/maps", pid_);
FILE* fp = fopen(path, "r");
#endif
if (fp == NULL) {
return false;
}
while(fgets(line, sizeof(line), fp)) {
backtrace_map_t map;
if (ParseLine(line, &map)) {
maps_.push_back(map);
}
}
#if defined(__APPLE__)
pclose(fp);
#else
fclose(fp);
#endif
return true;
}

26
libbacktrace/BacktraceThread.cpp
View file

@ -22,7 +22,6 @@
#include <sys/types.h>
#include <cutils/atomic.h>
#include <cutils/log.h>
#include "BacktraceThread.h"
#include "thread_utils.h"
@ -115,30 +114,21 @@ static void SignalHandler(int n __attribute__((unused)), siginfo_t* siginfo,
BacktraceThread::BacktraceThread(
BacktraceImpl* impl, BacktraceThreadInterface* thread_intf, pid_t tid,
backtrace_map_info_t* map_info)
: BacktraceCurrent(impl, map_info), thread_intf_(thread_intf) {
backtrace_.tid = tid;
BacktraceMap* map)
: BacktraceCurrent(impl, map), thread_intf_(thread_intf) {
tid_ = tid;
}
BacktraceThread::~BacktraceThread() {
}
void BacktraceThread::FinishUnwind() {
for (size_t i = 0; i < NumFrames(); i++) {
backtrace_frame_data_t* frame = &backtrace_.frames[i];
for (std::vector<backtrace_frame_data_t>::iterator it = frames_.begin();
it != frames_.end(); ++it) {
it->map = FindMap(it->pc);
frame->map_offset = 0;
uintptr_t map_start;
frame->map_name = GetMapName(frame->pc, &map_start);
if (frame->map_name) {
frame->map_offset = frame->pc - map_start;
}
frame->func_offset = 0;
std::string func_name = GetFunctionName(frame->pc, &frame->func_offset);
if (!func_name.empty()) {
frame->func_name = strdup(func_name.c_str());
}
it->func_offset = 0;
it->func_name = GetFunctionName(it->pc, &it->func_offset);
}
}

6
libbacktrace/BacktraceThread.h
View file

@ -22,12 +22,12 @@
#include "Backtrace.h"
typedef enum {
enum state_e {
STATE_WAITING = 0,
STATE_DUMPING,
STATE_DONE,
STATE_CANCEL,
} state_e;
};
class BacktraceThreadInterface;
@ -71,7 +71,7 @@ public:
// subclass both.
BacktraceThread(
BacktraceImpl* impl, BacktraceThreadInterface* thread_intf, pid_t tid,
backtrace_map_info_t* map_info);
BacktraceMap* map);
virtual ~BacktraceThread();
virtual bool Unwind(size_t num_ignore_frames);

148
libbacktrace/Corkscrew.cpp
View file

@ -16,12 +16,11 @@
#define LOG_TAG "libbacktrace"
#include <backtrace/backtrace.h>
#include <backtrace/Backtrace.h>
#include <string.h>
#include <backtrace-arch.h>
#include <cutils/log.h>
#include <corkscrew/backtrace.h>
#ifndef __USE_GNU
@ -31,6 +30,48 @@
#include "Corkscrew.h"
//-------------------------------------------------------------------------
// CorkscrewMap functions.
//-------------------------------------------------------------------------
CorkscrewMap::CorkscrewMap(pid_t pid) : BacktraceMap(pid), map_info_(NULL) {
}
CorkscrewMap::~CorkscrewMap() {
if (map_info_) {
free_map_info_list(map_info_);
map_info_ = NULL;
}
}
bool CorkscrewMap::Build() {
map_info_ = load_map_info_list(pid_);
// Use the information in map_info_ to construct the BacktraceMap data
// rather than reparsing /proc/self/maps.
map_info_t* cur_map = map_info_;
while (cur_map) {
backtrace_map_t map;
map.start = cur_map->start;
map.end = cur_map->end;
map.flags = 0;
if (cur_map->is_readable) {
map.flags |= PROT_READ;
}
if (cur_map->is_writable) {
map.flags |= PROT_WRITE;
}
if (cur_map->is_executable) {
map.flags |= PROT_EXEC;
}
map.name = cur_map->name;
maps_.push_back(map);
cur_map = cur_map->next;
}
return map_info_ != NULL;
}
//-------------------------------------------------------------------------
// CorkscrewCommon functions.
//-------------------------------------------------------------------------
@ -41,29 +82,19 @@ bool CorkscrewCommon::GenerateFrameData(
return false;
}
backtrace_t* data = GetBacktraceData();
data->num_frames = num_frames;
for (size_t i = 0; i < data->num_frames; i++) {
backtrace_frame_data_t* frame = &data->frames[i];
frame->num = i;
frame->pc = cork_frames[i].absolute_pc;
frame->sp = cork_frames[i].stack_top;
frame->stack_size = cork_frames[i].stack_size;
frame->map_name = NULL;
frame->map_offset = 0;
frame->func_name = NULL;
frame->func_offset = 0;
std::vector<backtrace_frame_data_t>* frames = GetFrames();
frames->resize(num_frames);
size_t i = 0;
for (std::vector<backtrace_frame_data_t>::iterator it = frames->begin();
it != frames->end(); ++it, ++i) {
it->num = i;
it->pc = cork_frames[i].absolute_pc;
it->sp = cork_frames[i].stack_top;
it->stack_size = cork_frames[i].stack_size;
it->func_offset = 0;
uintptr_t map_start;
frame->map_name = backtrace_obj_->GetMapName(frame->pc, &map_start);
if (frame->map_name) {
frame->map_offset = frame->pc - map_start;
}
std::string func_name = backtrace_obj_->GetFunctionName(frame->pc, &frame->func_offset);
if (!func_name.empty()) {
frame->func_name = strdup(func_name.c_str());
}
it->map = backtrace_obj_->FindMap(it->pc);
it->func_name = backtrace_obj_->GetFunctionName(it->pc, &it->func_offset);
}
return true;
}
@ -88,23 +119,23 @@ std::string CorkscrewCurrent::GetFunctionNameRaw(uintptr_t pc, uintptr_t* offset
*offset = 0;
Dl_info info;
const backtrace_map_info_t* map_info = backtrace_obj_->FindMapInfo(pc);
if (map_info) {
const backtrace_map_t* map = backtrace_obj_->FindMap(pc);
if (map) {
if (dladdr((const void*)pc, &info)) {
if (info.dli_sname) {
*offset = pc - map_info->start - (uintptr_t)info.dli_saddr + (uintptr_t)info.dli_fbase;
*offset = pc - map->start - (uintptr_t)info.dli_saddr + (uintptr_t)info.dli_fbase;
return info.dli_sname;
}
} else {
// dladdr(3) didn't find a symbol; maybe it's static? Look in the ELF file...
symbol_table_t* symbol_table = load_symbol_table(map_info->name);
symbol_table_t* symbol_table = load_symbol_table(map->name.c_str());
if (symbol_table) {
// First check if we can find the symbol using a relative pc.
std::string name;
const symbol_t* elf_symbol = find_symbol(symbol_table, pc - map_info->start);
const symbol_t* elf_symbol = find_symbol(symbol_table, pc - map->start);
if (elf_symbol) {
name = elf_symbol->name;
*offset = pc - map_info->start - elf_symbol->start;
*offset = pc - map->start - elf_symbol->start;
} else if ((elf_symbol = find_symbol(symbol_table, pc)) != NULL) {
// Found the symbol using the absolute pc.
name = elf_symbol->name;
@ -125,39 +156,36 @@ CorkscrewThread::CorkscrewThread() {
}
CorkscrewThread::~CorkscrewThread() {
if (corkscrew_map_info_) {
free_map_info_list(corkscrew_map_info_);
corkscrew_map_info_ = NULL;
}
}
bool CorkscrewThread::Init() {
corkscrew_map_info_ = load_map_info_list(backtrace_obj_->Pid());
return corkscrew_map_info_ != NULL;
if (backtrace_obj_->GetMap() == NULL) {
// Trigger the map object creation, which will create the corkscrew
// map information.
return BuildMap();
}
return true;
}
void CorkscrewThread::ThreadUnwind(
siginfo_t* siginfo, void* sigcontext, size_t num_ignore_frames) {
backtrace_frame_t frames[MAX_BACKTRACE_FRAMES];
backtrace_frame_t cork_frames[MAX_BACKTRACE_FRAMES];
CorkscrewMap* map = static_cast<CorkscrewMap*>(backtrace_obj_->GetMap());
ssize_t num_frames = unwind_backtrace_signal_arch(
siginfo, sigcontext, corkscrew_map_info_, frames, num_ignore_frames,
MAX_BACKTRACE_FRAMES);
siginfo, sigcontext, map->GetMapInfo(), cork_frames,
num_ignore_frames, MAX_BACKTRACE_FRAMES);
if (num_frames > 0) {
backtrace_t* data = GetBacktraceData();
data->num_frames = num_frames;
for (size_t i = 0; i < data->num_frames; i++) {
backtrace_frame_data_t* frame = &data->frames[i];
frame->num = i;
frame->pc = frames[i].absolute_pc;
frame->sp = frames[i].stack_top;
frame->stack_size = frames[i].stack_size;
frame->map_offset = 0;
frame->map_name = NULL;
frame->map_offset = 0;
frame->func_offset = 0;
frame->func_name = NULL;
std::vector<backtrace_frame_data_t>* frames = GetFrames();
frames->resize(num_frames);
size_t i = 0;
for (std::vector<backtrace_frame_data_t>::iterator it = frames->begin();
it != frames->end(); ++it, ++i) {
it->num = i;
it->pc = cork_frames[i].absolute_pc;
it->sp = cork_frames[i].stack_top;
it->stack_size = cork_frames[i].stack_size;
it->map = NULL;
it->func_offset = 0;
}
}
}
@ -206,15 +234,15 @@ std::string CorkscrewPtrace::GetFunctionNameRaw(uintptr_t pc, uintptr_t* offset)
//-------------------------------------------------------------------------
// C++ object creation functions.
//-------------------------------------------------------------------------
Backtrace* CreateCurrentObj(backtrace_map_info_t* map_info) {
return new BacktraceCurrent(new CorkscrewCurrent(), map_info);
Backtrace* CreateCurrentObj(BacktraceMap* map) {
return new BacktraceCurrent(new CorkscrewCurrent(), map);
}
Backtrace* CreatePtraceObj(pid_t pid, pid_t tid, backtrace_map_info_t* map_info) {
return new BacktracePtrace(new CorkscrewPtrace(), pid, tid, map_info);
Backtrace* CreatePtraceObj(pid_t pid, pid_t tid, BacktraceMap* map) {
return new BacktracePtrace(new CorkscrewPtrace(), pid, tid, map);
}
Backtrace* CreateThreadObj(pid_t tid, backtrace_map_info_t* map_info) {
Backtrace* CreateThreadObj(pid_t tid, BacktraceMap* map) {
CorkscrewThread* thread_obj = new CorkscrewThread();
return new BacktraceThread(thread_obj, thread_obj, tid, map_info);
return new BacktraceThread(thread_obj, thread_obj, tid, map);
}

20
libbacktrace/Corkscrew.h
View file

@ -21,8 +21,8 @@
#include <string>
#include <backtrace/backtrace.h>
#include <backtrace/Backtrace.h>
#include <backtrace/BacktraceMap.h>
#include <corkscrew/backtrace.h>
@ -32,6 +32,8 @@
class CorkscrewCommon : public BacktraceImpl {
public:
bool GenerateFrameData(backtrace_frame_t* cork_frames, ssize_t num_frames);
virtual BacktraceMap* CreateBacktraceMap(pid_t pid) { return new BacktraceMap(pid); }
};
class CorkscrewCurrent : public CorkscrewCommon {
@ -44,6 +46,19 @@ public:
virtual std::string GetFunctionNameRaw(uintptr_t pc, uintptr_t* offset);
};
class CorkscrewMap : public BacktraceMap {
public:
CorkscrewMap(pid_t pid);
virtual ~CorkscrewMap();
virtual bool Build();
map_info_t* GetMapInfo() { return map_info_; }
private:
map_info_t* map_info_;
};
class CorkscrewThread : public CorkscrewCurrent, public BacktraceThreadInterface {
public:
CorkscrewThread();
@ -54,8 +69,7 @@ public:
virtual void ThreadUnwind(
siginfo_t* siginfo, void* sigcontext, size_t num_ignore_frames);
private:
map_info_t* corkscrew_map_info_;
virtual BacktraceMap* CreateBacktraceMap(pid_t pid) { return new CorkscrewMap(pid); }
};
class CorkscrewPtrace : public CorkscrewCommon {

49
libbacktrace/UnwindCurrent.cpp
View file

@ -18,9 +18,8 @@
#include <sys/types.h>
#include <cutils/log.h>
#include <backtrace/backtrace.h>
#include <backtrace/Backtrace.h>
#include <backtrace/BacktraceMap.h>
#define UNW_LOCAL_ONLY
#include <libunwind.h>
@ -79,9 +78,6 @@ std::string UnwindCurrent::GetFunctionNameRaw(uintptr_t pc, uintptr_t* offset) {
}
bool UnwindCurrent::UnwindFromContext(size_t num_ignore_frames, bool resolve) {
backtrace_t* backtrace = GetBacktraceData();
backtrace->num_frames = 0;
// The cursor structure is pretty large, do not put it on the stack.
unw_cursor_t* cursor = new unw_cursor_t;
int ret = unw_init_local(cursor, &context_);
@ -91,6 +87,9 @@ bool UnwindCurrent::UnwindFromContext(size_t num_ignore_frames, bool resolve) {
return false;
}
std::vector<backtrace_frame_data_t>* frames = GetFrames();
frames->reserve(MAX_BACKTRACE_FRAMES);
size_t num_frames = 0;
do {
unw_word_t pc;
ret = unw_get_reg(cursor, UNW_REG_IP, &pc);
@ -106,42 +105,32 @@ bool UnwindCurrent::UnwindFromContext(size_t num_ignore_frames, bool resolve) {
}
if (num_ignore_frames == 0) {
size_t num_frames = backtrace->num_frames;
backtrace_frame_data_t* frame = &backtrace->frames[num_frames];
frames->resize(num_frames+1);
backtrace_frame_data_t* frame = &frames->at(num_frames);
frame->num = num_frames;
frame->pc = static_cast<uintptr_t>(pc);
frame->sp = static_cast<uintptr_t>(sp);
frame->stack_size = 0;
frame->map_name = NULL;
frame->map_offset = 0;
frame->func_name = NULL;
frame->func_offset = 0;
if (num_frames > 0) {
// Set the stack size for the previous frame.
backtrace_frame_data_t* prev = &backtrace->frames[num_frames-1];
backtrace_frame_data_t* prev = &frames->at(num_frames-1);
prev->stack_size = frame->sp - prev->sp;
}
if (resolve) {
std::string func_name = backtrace_obj_->GetFunctionName(frame->pc, &frame->func_offset);
if (!func_name.empty()) {
frame->func_name = strdup(func_name.c_str());
}
uintptr_t map_start;
frame->map_name = backtrace_obj_->GetMapName(frame->pc, &map_start);
if (frame->map_name) {
frame->map_offset = frame->pc - map_start;
}
frame->func_name = backtrace_obj_->GetFunctionName(frame->pc, &frame->func_offset);
frame->map = backtrace_obj_->FindMap(frame->pc);
} else {
frame->map = NULL;
frame->func_offset = 0;
}
backtrace->num_frames++;
num_frames++;
} else {
num_ignore_frames--;
}
ret = unw_step (cursor);
} while (ret > 0 && backtrace->num_frames < MAX_BACKTRACE_FRAMES);
} while (ret > 0 && num_frames < MAX_BACKTRACE_FRAMES);
delete cursor;
return true;
@ -195,11 +184,11 @@ void UnwindThread::ThreadUnwind(
//-------------------------------------------------------------------------
// C++ object creation function.
//-------------------------------------------------------------------------
Backtrace* CreateCurrentObj(backtrace_map_info_t* map_info) {
return new BacktraceCurrent(new UnwindCurrent(), map_info);
Backtrace* CreateCurrentObj(BacktraceMap* map) {
return new BacktraceCurrent(new UnwindCurrent(), map);
}
Backtrace* CreateThreadObj(pid_t tid, backtrace_map_info_t* map_info) {
Backtrace* CreateThreadObj(pid_t tid, BacktraceMap* map) {
UnwindThread* thread_obj = new UnwindThread();
return new BacktraceThread(thread_obj, thread_obj, tid, map_info);
return new BacktraceThread(thread_obj, thread_obj, tid, map);
}

2
libbacktrace/UnwindCurrent.h
View file

@ -38,6 +38,8 @@ public:
void ExtractContext(void* sigcontext);
virtual BacktraceMap* CreateBacktraceMap(pid_t pid) { return new BacktraceMap(pid); }
protected:
unw_context_t context_;
};

40
libbacktrace/UnwindPtrace.cpp
View file

@ -16,13 +16,12 @@
#define LOG_TAG "libbacktrace"
#include <backtrace/backtrace.h>
#include <backtrace/Backtrace.h>
#include <backtrace/BacktraceMap.h>
#include <sys/types.h>
#include <string.h>
#include <cutils/log.h>
#include <libunwind.h>
#include <libunwind-ptrace.h>
@ -55,9 +54,6 @@ bool UnwindPtrace::Unwind(size_t num_ignore_frames) {
return false;
}
backtrace_t* backtrace = GetBacktraceData();
backtrace->num_frames = 0;
unw_cursor_t cursor;
int ret = unw_init_remote(&cursor, addr_space_, upt_info_);
if (ret < 0) {
@ -65,6 +61,9 @@ bool UnwindPtrace::Unwind(size_t num_ignore_frames) {
return false;
}
std::vector<backtrace_frame_data_t>* frames = GetFrames();
frames->reserve(MAX_BACKTRACE_FRAMES);
size_t num_frames = 0;
do {
unw_word_t pc;
ret = unw_get_reg(&cursor, UNW_REG_IP, &pc);
@ -80,39 +79,28 @@ bool UnwindPtrace::Unwind(size_t num_ignore_frames) {
}
if (num_ignore_frames == 0) {
size_t num_frames = backtrace->num_frames;
backtrace_frame_data_t* frame = &backtrace->frames[num_frames];
frames->resize(num_frames+1);
backtrace_frame_data_t* frame = &frames->at(num_frames);
frame->num = num_frames;
frame->pc = static_cast<uintptr_t>(pc);
frame->sp = static_cast<uintptr_t>(sp);
frame->stack_size = 0;
frame->map_name = NULL;
frame->map_offset = 0;
frame->func_name = NULL;
frame->func_offset = 0;
if (num_frames > 0) {
backtrace_frame_data_t* prev = &backtrace->frames[num_frames-1];
backtrace_frame_data_t* prev = &frames->at(num_frames-1);
prev->stack_size = frame->sp - prev->sp;
}
std::string func_name = backtrace_obj_->GetFunctionName(frame->pc, &frame->func_offset);
if (!func_name.empty()) {
frame->func_name = strdup(func_name.c_str());
}
frame->func_name = backtrace_obj_->GetFunctionName(frame->pc, &frame->func_offset);
uintptr_t map_start;
frame->map_name = backtrace_obj_->GetMapName(frame->pc, &map_start);
if (frame->map_name) {
frame->map_offset = frame->pc - map_start;
}
frame->map = backtrace_obj_->FindMap(frame->pc);
backtrace->num_frames++;
num_frames++;
} else {
num_ignore_frames--;
}
ret = unw_step (&cursor);
} while (ret > 0 && backtrace->num_frames < MAX_BACKTRACE_FRAMES);
} while (ret > 0 && num_frames < MAX_BACKTRACE_FRAMES);
return true;
}
@ -132,6 +120,6 @@ std::string UnwindPtrace::GetFunctionNameRaw(uintptr_t pc, uintptr_t* offset) {
//-------------------------------------------------------------------------
// C++ object creation function.
//-------------------------------------------------------------------------
Backtrace* CreatePtraceObj(pid_t pid, pid_t tid, backtrace_map_info_t* map_info) {
return new BacktracePtrace(new UnwindPtrace(), pid, tid, map_info);
Backtrace* CreatePtraceObj(pid_t pid, pid_t tid, BacktraceMap* map) {
return new BacktracePtrace(new UnwindPtrace(), pid, tid, map);
}

2
libbacktrace/UnwindPtrace.h
View file

@ -32,6 +32,8 @@ public:
virtual std::string GetFunctionNameRaw(uintptr_t pc, uintptr_t* offset);
virtual BacktraceMap* CreateBacktraceMap(pid_t pid) { return new BacktraceMap(pid); }
private:
unw_addr_space_t addr_space_;
struct UPT_info* upt_info_;

95
libbacktrace/backtrace_test.cpp
View file

@ -29,6 +29,7 @@
#include <unistd.h>
#include <backtrace/Backtrace.h>
#include <backtrace/BacktraceMap.h>
#include <UniquePtr.h>
#include <cutils/atomic.h>
@ -50,18 +51,18 @@
// Number of simultaneous threads running in our forked process.
#define NUM_PTRACE_THREADS 5
typedef struct {
struct thread_t {
pid_t tid;
int32_t state;
pthread_t threadId;
} thread_t;
};
typedef struct {
struct dump_thread_t {
thread_t thread;
Backtrace* backtrace;
int32_t* now;
int32_t done;
} dump_thread_t;
};
extern "C" {
// Prototypes for functions in the test library.
@ -103,9 +104,8 @@ void WaitForStop(pid_t pid) {
bool ReadyLevelBacktrace(Backtrace* backtrace) {
// See if test_level_four is in the backtrace.
bool found = false;
for (size_t i = 0; i < backtrace->NumFrames(); i++) {
const backtrace_frame_data_t* frame = backtrace->GetFrame(i);
if (frame->func_name != NULL && strcmp(frame->func_name, "test_level_four") == 0) {
for (Backtrace::const_iterator it = backtrace->begin(); it != backtrace->end(); ++it) {
if (it->func_name == "test_level_four") {
found = true;
break;
}
@ -122,8 +122,7 @@ void VerifyLevelDump(Backtrace* backtrace) {
// frame we want.
size_t frame_num = 0;
for (size_t i = backtrace->NumFrames()-1; i > 2; i--) {
if (backtrace->GetFrame(i)->func_name != NULL &&
strcmp(backtrace->GetFrame(i)->func_name, "test_level_one") == 0) {
if (backtrace->GetFrame(i)->func_name == "test_level_one") {
frame_num = i;
break;
}
@ -131,14 +130,10 @@ void VerifyLevelDump(Backtrace* backtrace) {
ASSERT_LT(static_cast<size_t>(0), frame_num);
ASSERT_LE(static_cast<size_t>(3), frame_num);
ASSERT_TRUE(NULL != backtrace->GetFrame(frame_num)->func_name);
ASSERT_STREQ(backtrace->GetFrame(frame_num)->func_name, "test_level_one");
ASSERT_TRUE(NULL != backtrace->GetFrame(frame_num-1)->func_name);
ASSERT_STREQ(backtrace->GetFrame(frame_num-1)->func_name, "test_level_two");
ASSERT_TRUE(NULL != backtrace->GetFrame(frame_num-2)->func_name);
ASSERT_STREQ(backtrace->GetFrame(frame_num-2)->func_name, "test_level_three");
ASSERT_TRUE(NULL != backtrace->GetFrame(frame_num-3)->func_name);
ASSERT_STREQ(backtrace->GetFrame(frame_num-3)->func_name, "test_level_four");
ASSERT_EQ(backtrace->GetFrame(frame_num)->func_name, "test_level_one");
ASSERT_EQ(backtrace->GetFrame(frame_num-1)->func_name, "test_level_two");
ASSERT_EQ(backtrace->GetFrame(frame_num-2)->func_name, "test_level_three");
ASSERT_EQ(backtrace->GetFrame(frame_num-3)->func_name, "test_level_four");
}
void VerifyLevelBacktrace(void*) {
@ -157,9 +152,8 @@ bool ReadyMaxBacktrace(Backtrace* backtrace) {
void VerifyMaxDump(Backtrace* backtrace) {
ASSERT_EQ(backtrace->NumFrames(), static_cast<size_t>(MAX_BACKTRACE_FRAMES));
// Verify that the last frame is our recursive call.
ASSERT_TRUE(NULL != backtrace->GetFrame(MAX_BACKTRACE_FRAMES-1)->func_name);
ASSERT_STREQ(backtrace->GetFrame(MAX_BACKTRACE_FRAMES-1)->func_name,
"test_recursive_call");
ASSERT_EQ(backtrace->GetFrame(MAX_BACKTRACE_FRAMES-1)->func_name,
"test_recursive_call");
}
void VerifyMaxBacktrace(void*) {
@ -220,8 +214,7 @@ void VerifyIgnoreFrames(
EXPECT_EQ(bt_ign2->GetFrame(i)->sp, bt_all->GetFrame(i+2)->sp);
EXPECT_EQ(bt_ign2->GetFrame(i)->stack_size, bt_all->GetFrame(i+2)->stack_size);
}
if (!check && bt_ign2->GetFrame(i)->func_name &&
strcmp(bt_ign2->GetFrame(i)->func_name, cur_proc) == 0) {
if (!check && bt_ign2->GetFrame(i)->func_name == cur_proc) {
check = true;
}
}
@ -598,38 +591,64 @@ TEST(libbacktrace, format_test) {
ASSERT_TRUE(backtrace.get() != NULL);
backtrace_frame_data_t frame;
memset(&frame, 0, sizeof(backtrace_frame_data_t));
frame.num = 1;
frame.pc = 2;
frame.sp = 0;
frame.stack_size = 0;
frame.map = NULL;
frame.func_offset = 0;
backtrace_map_t map;
map.start = 0;
map.end = 0;
// Check no map set.
frame.num = 1;
#if defined(__LP64__)
EXPECT_STREQ("#01 pc 0000000000000000 <unknown>",
EXPECT_EQ("#01 pc 0000000000000002 <unknown>",
#else
EXPECT_STREQ("#01 pc 00000000 <unknown>",
EXPECT_EQ("#01 pc 00000002 <unknown>",
#endif
backtrace->FormatFrameData(&frame).c_str());
backtrace->FormatFrameData(&frame));
frame.pc = 0x12345678;
frame.map_name = "MapFake";
// Check map name empty, but exists.
frame.map = &map;
map.start = 1;
#if defined(__LP64__)
EXPECT_STREQ("#01 pc 0000000012345678 MapFake",
EXPECT_EQ("#01 pc 0000000000000001 <unknown>",
#else
EXPECT_STREQ("#01 pc 12345678 MapFake",
EXPECT_EQ("#01 pc 00000001 <unknown>",
#endif
backtrace->FormatFrameData(&frame).c_str());
backtrace->FormatFrameData(&frame));
frame.func_name = const_cast<char*>("ProcFake");
// Check relative pc is set and map name is set.
frame.pc = 0x12345679;
frame.map = &map;
map.name = "MapFake";
map.start = 1;
#if defined(__LP64__)
EXPECT_STREQ("#01 pc 0000000012345678 MapFake (ProcFake)",
EXPECT_EQ("#01 pc 0000000012345678 MapFake",
#else
EXPECT_STREQ("#01 pc 12345678 MapFake (ProcFake)",
EXPECT_EQ("#01 pc 12345678 MapFake",
#endif
backtrace->FormatFrameData(&frame).c_str());
backtrace->FormatFrameData(&frame));
// Check func_name is set, but no func offset.
frame.func_name = "ProcFake";
#if defined(__LP64__)
EXPECT_EQ("#01 pc 0000000012345678 MapFake (ProcFake)",
#else
EXPECT_EQ("#01 pc 12345678 MapFake (ProcFake)",
#endif
backtrace->FormatFrameData(&frame));
// Check func_name is set, and func offset is non-zero.
frame.func_offset = 645;
#if defined(__LP64__)
EXPECT_STREQ("#01 pc 0000000012345678 MapFake (ProcFake+645)",
EXPECT_EQ("#01 pc 0000000012345678 MapFake (ProcFake+645)",
#else
EXPECT_STREQ("#01 pc 12345678 MapFake (ProcFake+645)",
EXPECT_EQ("#01 pc 12345678 MapFake (ProcFake+645)",
#endif
backtrace->FormatFrameData(&frame).c_str());
backtrace->FormatFrameData(&frame));
}

173
libbacktrace/map_info.c
View file

@ -1,173 +0,0 @@
/*
* Copyright (C) 2013 The Android Open Source Project
*
* 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.
*/
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include <pthread.h>
#include <unistd.h>
#include <cutils/log.h>
#include <sys/time.h>
#include <backtrace/backtrace.h>
#if defined(__APPLE__)
// Mac OS vmmap(1) output:
// __TEXT 0009f000-000a1000 [ 8K 8K] r-x/rwx SM=COW /Volumes/android/dalvik-dev/out/host/darwin-x86/bin/libcorkscrew_test\n
// 012345678901234567890123456789012345678901234567890123456789
// 0 1 2 3 4 5
static backtrace_map_info_t* parse_vmmap_line(const char* line) {
unsigned long int start;
unsigned long int end;
char permissions[4];
int name_pos;
if (sscanf(line, "%*21c %lx-%lx [%*13c] %3c/%*3c SM=%*3c %n",
&start, &end, permissions, &name_pos) != 3) {
return NULL;
}
const char* name = line + name_pos;
size_t name_len = strlen(name);
backtrace_map_info_t* mi = calloc(1, sizeof(backtrace_map_info_t) + name_len);
if (mi != NULL) {
mi->start = start;
mi->end = end;
mi->is_readable = permissions[0] == 'r';
mi->is_writable = permissions[1] == 'w';
mi->is_executable = permissions[2] == 'x';
memcpy(mi->name, name, name_len);
mi->name[name_len - 1] = '\0';
ALOGV("Parsed map: start=0x%08x, end=0x%08x, "
"is_readable=%d, is_writable=%d is_executable=%d, name=%s",
mi->start, mi->end,
mi->is_readable, mi->is_writable, mi->is_executable, mi->name);
}
return mi;
}
backtrace_map_info_t* backtrace_create_map_info_list(pid_t pid) {
char cmd[1024];
if (pid < 0) {
pid = getpid();
}
snprintf(cmd, sizeof(cmd), "vmmap -w -resident -submap -allSplitLibs -interleaved %d", pid);
FILE* fp = popen(cmd, "r");
if (fp == NULL) {
return NULL;
}
char line[1024];
backtrace_map_info_t* milist = NULL;
while (fgets(line, sizeof(line), fp) != NULL) {
backtrace_map_info_t* mi = parse_vmmap_line(line);
if (mi != NULL) {
mi->next = milist;
milist = mi;
}
}
pclose(fp);
return milist;
}
#else
// Linux /proc/<pid>/maps lines:
// 6f000000-6f01e000 rwxp 00000000 00:0c 16389419 /system/lib/libcomposer.so\n
// 012345678901234567890123456789012345678901234567890123456789
// 0 1 2 3 4 5
static backtrace_map_info_t* parse_maps_line(const char* line)
{
unsigned long int start;
unsigned long int end;
char permissions[5];
int name_pos;
if (sscanf(line, "%lx-%lx %4s %*x %*x:%*x %*d%n", &start, &end,
permissions, &name_pos) != 3) {
return NULL;
}
while (isspace(line[name_pos])) {
name_pos += 1;
}
const char* name = line + name_pos;
size_t name_len = strlen(name);
if (name_len && name[name_len - 1] == '\n') {
name_len -= 1;
}
backtrace_map_info_t* mi = calloc(1, sizeof(backtrace_map_info_t) + name_len + 1);
if (mi) {
mi->start = start;
mi->end = end;
mi->is_readable = strlen(permissions) == 4 && permissions[0] == 'r';
mi->is_writable = strlen(permissions) == 4 && permissions[1] == 'w';
mi->is_executable = strlen(permissions) == 4 && permissions[2] == 'x';
memcpy(mi->name, name, name_len);
mi->name[name_len] = '\0';
ALOGV("Parsed map: start=0x%08x, end=0x%08x, "
"is_readable=%d, is_writable=%d, is_executable=%d, name=%s",
mi->start, mi->end,
mi->is_readable, mi->is_writable, mi->is_executable, mi->name);
}
return mi;
}
backtrace_map_info_t* backtrace_create_map_info_list(pid_t tid) {
char path[PATH_MAX];
char line[1024];
FILE* fp;
backtrace_map_info_t* milist = NULL;
if (tid < 0) {
tid = getpid();
}
snprintf(path, PATH_MAX, "/proc/%d/maps", tid);
fp = fopen(path, "r");
if (fp) {
while(fgets(line, sizeof(line), fp)) {
backtrace_map_info_t* mi = parse_maps_line(line);
if (mi) {
mi->next = milist;
milist = mi;
}
}
fclose(fp);
}
return milist;
}
#endif
void backtrace_destroy_map_info_list(backtrace_map_info_t* milist) {
while (milist) {
backtrace_map_info_t* next = milist->next;
free(milist);
milist = next;
}
}
const backtrace_map_info_t* backtrace_find_map_info(
const backtrace_map_info_t* milist, uintptr_t addr) {
const backtrace_map_info_t* mi = milist;
while (mi && !(addr >= mi->start && addr < mi->end)) {
mi = mi->next;
}
return mi;
}