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Issue 146 - reviewer Waylonis
git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@137 4c0a9323-5329-0410-9bdc-e9ce6186880e
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ladderbreaker
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@ -39,11 +39,12 @@
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NSString *sourcePath_; // Source of symbols (STRONG)
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NSString *architecture_; // Architecture to extract (STRONG)
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NSMutableDictionary *addresses_; // Addresses and symbols (STRONG)
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NSMutableSet *functionAddresses_; // Function addresses (STRONG)
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NSMutableDictionary *sources_; // Address and Source file paths (STRONG)
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NSMutableArray *cppAddresses_; // Addresses of C++ symbols (STRONG)
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NSMutableDictionary *headers_; // Mach-o header information (STRONG)
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NSMutableDictionary *lastFunctionStartDict_; // Keyed by section# (STRONG)
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NSMutableDictionary *sectionNumbers_; // Keyed by seg/sect name (STRONG)
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uint32_t lastStartAddress_;
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}
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- (id)initWithContentsOfFile:(NSString *)machoFile;
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@ -269,17 +269,16 @@ static BOOL StringTailMatches(NSString *str, NSString *tail) {
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[dict release];
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}
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if (name && ![dict objectForKey:kAddressSymbolKey])
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if (name && ![dict objectForKey:kAddressSymbolKey]) {
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[dict setObject:name forKey:kAddressSymbolKey];
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// only functions, not line number addresses
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[functionAddresses_ addObject:addressNum];
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}
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if (line && ![dict objectForKey:kAddressSourceLineKey])
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[dict setObject:[NSNumber numberWithUnsignedInt:line]
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forKey:kAddressSourceLineKey];
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// Save the function name so that we can add the end of function address
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if ([name length]) {
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[lastFunctionStartDict_ setObject:addressNum forKey:[NSNumber numberWithUnsignedInt:section] ];
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}
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}
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//=============================================================================
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@ -287,10 +286,32 @@ static BOOL StringTailMatches(NSString *str, NSString *tail) {
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uint32_t n_strx = list->n_un.n_strx;
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BOOL result = NO;
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// We don't care about non-section specific information
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if (list->n_sect == 0 )
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// We don't care about non-section specific information except function length
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if (list->n_sect == 0 && list->n_type != N_FUN )
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return NO;
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if (list->n_type == N_FUN) {
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if (list->n_sect != 0) {
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// we get the function address from the first N_FUN
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lastStartAddress_ = list->n_value;
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}
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else {
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// an N_FUN from section 0 may follow the initial N_FUN
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// giving us function length information
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NSMutableDictionary *dict = [addresses_ objectForKey:
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[NSNumber numberWithUnsignedLong:lastStartAddress_] ];
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assert(dict);
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// only set the function size the first time
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// (sometimes multiple section 0 N_FUN entries appear!)
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if (![dict objectForKey:kFunctionSizeKey]) {
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[dict setObject:[NSNumber numberWithUnsignedLongLong:list->n_value]
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forKey:kFunctionSizeKey];
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}
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}
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}
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int line = list->n_desc;
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// We only care about line number information in __TEXT __text
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@ -298,7 +319,7 @@ static BOOL StringTailMatches(NSString *str, NSString *tail) {
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if(list->n_sect != mainSection) {
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line = 0;
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}
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// Extract debugging information:
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// Doc: http://developer.apple.com/documentation/DeveloperTools/gdb/stabs/stabs_toc.html
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// Header: /usr/include/mach-o/stab.h:
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@ -336,24 +357,9 @@ static BOOL StringTailMatches(NSString *str, NSString *tail) {
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} else if (((list->n_type & N_TYPE) == N_SECT) && !(list->n_type & N_STAB)) {
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// Regular symbols or ones that are external
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NSString *fn = [NSString stringWithUTF8String:&table[n_strx]];
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[self addFunction:fn line:0 address:list->n_value section:list->n_sect ];
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result = YES;
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} else if (list->n_type == N_ENSYM && list->n_sect == mainSection ) {
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NSNumber *lastFunctionStart = [lastFunctionStartDict_
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objectForKey:[NSNumber numberWithUnsignedLongLong:list->n_sect] ];
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if (lastFunctionStart) {
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unsigned long long start = [lastFunctionStart unsignedLongLongValue];
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unsigned long long size = list->n_value - start;
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NSMutableDictionary *dict = [addresses_ objectForKey:lastFunctionStart];
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assert(dict);
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assert(list->n_value > start);
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[dict setObject:[NSNumber numberWithUnsignedLongLong:size]
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forKey:kFunctionSizeKey];
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[lastFunctionStartDict_ removeObjectForKey:[NSNumber numberWithUnsignedLongLong:list->n_sect] ];
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}
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}
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return result;
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@ -392,7 +398,7 @@ static BOOL StringTailMatches(NSString *str, NSString *tail) {
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nlist64.n_un.n_strx = SwapLongIfNeeded(list->n_un.n_strx);
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nlist64.n_type = list->n_type;
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nlist64.n_sect = list->n_sect;
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nlist64.n_desc = SwapIntIfNeeded(list->n_desc);
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nlist64.n_desc = SwapShortIfNeeded(list->n_desc);
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nlist64.n_value = (uint64_t)SwapLongIfNeeded(list->n_value);
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if ([self processSymbolItem:&nlist64 stringTable:strtab])
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@ -437,7 +443,7 @@ static BOOL StringTailMatches(NSString *str, NSString *tail) {
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nlist64.n_un.n_strx = SwapLongIfNeeded(list->n_un.n_strx);
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nlist64.n_type = list->n_type;
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nlist64.n_sect = list->n_sect;
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nlist64.n_desc = SwapIntIfNeeded(list->n_desc);
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nlist64.n_desc = SwapShortIfNeeded(list->n_desc);
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nlist64.n_value = SwapLongLongIfNeeded(list->n_value);
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if ([self processSymbolItem:&nlist64 stringTable:strtab])
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@ -668,15 +674,6 @@ static BOOL WriteFormat(int fd, const char *fmt, ...) {
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uint64_t moduleSize =
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moduleSizeNum ? [moduleSizeNum unsignedLongLongValue] : 0;
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[lastFunctionStartDict_ removeAllObjects];
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// Gather the information
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[self loadSymbolInfoForArchitecture];
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[self convertSymbols];
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NSArray *sortedAddresses = [[addresses_ allKeys]
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sortedArrayUsingSelector:@selector(compare:)];
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// UUID
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FileID file_id([sourcePath_ fileSystemRepresentation]);
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unsigned char identifier[16];
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@ -688,9 +685,27 @@ static BOOL WriteFormat(int fd, const char *fmt, ...) {
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sizeof(identifierStr));
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}
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else {
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strlcpy(identifierStr, moduleName, sizeof(identifierStr));
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fprintf(stderr, "Unable to calculate UUID of mach-o binary!\n");
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return NO;
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}
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// keep track exclusively of function addresses
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// for sanity checking function lengths
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functionAddresses_ = [[NSMutableSet alloc] init];
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// Gather the information
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[self loadSymbolInfoForArchitecture];
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[self convertSymbols];
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NSArray *sortedAddresses = [[addresses_ allKeys]
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sortedArrayUsingSelector:@selector(compare:)];
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NSArray *sortedFunctionAddresses = [[functionAddresses_ allObjects]
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sortedArrayUsingSelector:@selector(compare:)];
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// position ourselves at the 2nd function
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unsigned int funcIndex = 1;
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// Remove the dashes from the string
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NSMutableString *compactedStr =
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[NSMutableString stringWithCString:identifierStr encoding:NSASCIIStringEncoding];
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@ -733,7 +748,7 @@ static BOOL WriteFormat(int fd, const char *fmt, ...) {
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// The symbol reader doesn't want a trailing newline
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terminatingChar = '\0';
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}
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NSDictionary *dict = [addresses_ objectForKey:address];
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NSNumber *line = [dict objectForKey:kAddressSourceLineKey];
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NSString *symbol = [dict objectForKey:kAddressConvertedSymbolKey];
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@ -741,6 +756,15 @@ static BOOL WriteFormat(int fd, const char *fmt, ...) {
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if (!symbol)
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symbol = [dict objectForKey:kAddressSymbolKey];
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// sanity check the function length by making sure it doesn't
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// run beyond the next function entry
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uint64_t nextFunctionAddress = 0;
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if (symbol && funcIndex < [sortedFunctionAddresses count]) {
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nextFunctionAddress = [[sortedFunctionAddresses objectAtIndex:funcIndex]
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unsignedLongLongValue] - baseAddress;
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++funcIndex;
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}
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// Skip some symbols
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if (StringHeadMatches(symbol, @"vtable for"))
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continue;
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@ -785,6 +809,16 @@ static BOOL WriteFormat(int fd, const char *fmt, ...) {
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if (line) {
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if (symbol && functionLength) {
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uint64_t functionLengthVal = [functionLength unsignedLongLongValue];
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// sanity check to make sure the length we were told does not exceed
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// the space between this function and the next
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if (nextFunctionAddress != 0) {
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uint64_t functionLengthVal2 = nextFunctionAddress - addressVal;
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if(functionLengthVal > functionLengthVal2 ) {
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functionLengthVal = functionLengthVal2;
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}
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}
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// Function
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if (!WriteFormat(fd, "FUNC %llx %llx 0 %s\n", addressVal,
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@ -824,10 +858,6 @@ static BOOL WriteFormat(int fd, const char *fmt, ...) {
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return nil;
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}
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// keep track of last function start address on a per-section basis
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if (!lastFunctionStartDict_)
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lastFunctionStartDict_ = [[NSMutableDictionary alloc] init];
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// If there's more than one, use the native one
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if ([headers_ count] > 1) {
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const NXArchInfo *localArchInfo = NXGetLocalArchInfo();
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@ -863,10 +893,10 @@ static BOOL WriteFormat(int fd, const char *fmt, ...) {
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[sourcePath_ release];
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[architecture_ release];
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[addresses_ release];
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[functionAddresses_ release];
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[sources_ release];
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[headers_ release];
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[lastFunctionStartDict_ release];
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[super dealloc];
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}
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