Add support for Linux memory mapping stream and remove ELF header usage

src/processor/minidump.cc

Index: src/processor/minidump.cc
===================================================================
--- src/processor/minidump.cc	(revision 1474)
+++ src/processor/minidump.cc	(working copy)
@@ -55,6 +55,7 @@
 #include <iostream>
 #include <limits>
 #include <map>
+#include <sstream>
 #include <vector>
 
 #include "processor/range_map-inl.h"
@@ -71,6 +72,7 @@
 using std::istream;
 using std::ifstream;
 using std::numeric_limits;
+using std::stringstream;
 using std::vector;
 
 // Returns true iff |context_size| matches exactly one of the sizes of the
@@ -3972,8 +3974,144 @@
   }
 }
 
+//
+// MinidumpLinuxMaps
+//
 
+MinidumpLinuxMaps::MinidumpLinuxMaps(Minidump *minidump)
+    : MinidumpObject(minidump) {
+}
+
+void MinidumpLinuxMaps::Print() {
+  if (!valid_) {
+    BPLOG(ERROR) << "MinidumpLinuxMaps cannot print invalid data";
+    return;
+  }
+  std::cout << GetPathname() << std::endl;
+}
+
 //
+// MinidumpLinuxMapsList
+//
+
+MinidumpLinuxMapsList::MinidumpLinuxMapsList(Minidump *minidump)
+    : MinidumpStream(minidump),
+      maps_(NULL),
+      maps_count_(0) {
+}
+
+MinidumpLinuxMapsList::~MinidumpLinuxMapsList() {
+  for (unsigned int i = 0; i < maps_->size(); i++) {
+    delete (*maps_)[i];
+  }
+  delete maps_;
+}
+
+const MinidumpLinuxMaps *MinidumpLinuxMapsList::GetLinuxMapsForAddress(
+    uint64_t address) const {
+  if (!valid_) {
+    BPLOG(ERROR) << "Invalid MinidumpLinuxMapsList for GetLinuxMapsForAddress";
+    return NULL;
+  }
+
+  // Search every memory mapping.
+  for (unsigned int index = 0; index < maps_count_; index++) {
+    // Check if address is within bounds of the current memory region.
+    if ((*maps_)[index]->GetBase() <= address &&
+        (*maps_)[index]->GetBase() + (*maps_)[index]->GetSize() > address) {
+      return (*maps_)[index];
+    }
+  }
+
+  // No mapping encloses the memory address.
+  BPLOG(ERROR) << "MinidumpLinuxMapsList has no mapping at "
+               << HexString(address);
+  return NULL;
+}
+
+const MinidumpLinuxMaps *MinidumpLinuxMapsList::GetLinuxMapsAtIndex(
+    unsigned int index) const {
+  if (!valid_) {
+    BPLOG(ERROR) << "Invalid MinidumpLinuxMapsList for GetLinuxMapsAtIndex";
+    return NULL;
+  }
+
+  // Index out of bounds.
+  if (index >= maps_count_) {
+    BPLOG(ERROR) << "MinidumpLinuxMapsList index of out range: "
+                 << index
+                 << "/"
+                 << maps_count_;
+    return NULL;
+  }
+  return (*maps_)[index];
+}
+
+bool MinidumpLinuxMapsList::Read(uint32_t expected_size) {
+  // Invalidate cached data.
+  delete maps_;
+  maps_ = NULL;
+  maps_count_ = 0;
+
+  valid_ = false;
+
+  // Load and check expected stream length.
+  uint32_t length = 0;
+  if (!minidump_->SeekToStreamType(MD_LINUX_MAPS, &length)) {
+    BPLOG(ERROR) << "MinidumpLinuxMapsList stream type not found";
+    return false;
+  }
+  if (expected_size != length) {
+    BPLOG(ERROR) << "MinidumpLinuxMapsList size mismatch: "
+                 << expected_size
+                 << " != "
+                 << length;
+    return false;
+  }
+
+  // Create a vector to read stream data. The vector needs to have
+  // at least enough capacity to read all the data.
+  vector<char> mapping_bytes(length);
+  if (!minidump_->ReadBytes(&mapping_bytes[0], length)) {
+    BPLOG(ERROR) << "MinidumpLinuxMapsList failed to read bytes";
+    return false;
+  }
+  string map_string(mapping_bytes.begin(), mapping_bytes.end());
+  vector<MappedMemoryRegion> all_regions;
+
+  // Parse string into mapping data.
+  if (!ParseProcMaps(map_string, &all_regions)) {
+    return false;
+  }
+
+  scoped_ptr<MinidumpLinuxMappings> maps(new MinidumpLinuxMappings());
+
+  // Push mapping data into wrapper classes.
+  for (size_t i = 0; i < all_regions.size(); i++) {
+    scoped_ptr<MinidumpLinuxMaps> ele(new MinidumpLinuxMaps(minidump_));
+    ele->region_ = all_regions[i];
+    ele->valid_ = true;
+    maps->push_back(ele.release());
+  }
+
+  // Set instance variables.
+  maps_ = maps.release();
+  maps_count_ = maps_->size();
+  valid_ = true;
+  return true;
+}
+
+void MinidumpLinuxMapsList::Print() {
+  if (!valid_) {
+    BPLOG(ERROR) << "MinidumpLinuxMapsList cannot print valid data";
+    return;
+  }
+  for (size_t i = 0; i < maps_->size(); i++) {
+    (*maps_)[i]->Print();
+  }
+}
+
+//
 // Minidump
 //
 
@@ -4292,6 +4430,11 @@
   return GetStream(&memory_info_list);
 }
 
+MinidumpLinuxMapsList *Minidump::GetLinuxMapsList() {
+  MinidumpLinuxMapsList *linux_maps_list;
+  return GetStream(&linux_maps_list);
+}
+
 static const char* get_stream_name(uint32_t stream_type) {
   switch (stream_type) {
   case MD_UNUSED_STREAM: