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This is a fix for a stackwalker_x86 issue which has to

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do with FPO (frame-pointer-omission) optimized context
frames where the context frame represents a Windows
System call stub.



git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@971 4c0a9323-5329-0410-9bdc-e9ce6186880e
This commit is contained in:
ivan.penkov@gmail.com 2012-06-12 21:18:45 +00:00
parent c50346b341
commit 1208a8e369
8 changed files with 547 additions and 294 deletions
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14
src/processor/fast_source_line_resolver.cc
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@ -107,10 +107,15 @@ void FastSourceLineResolver::Module::LookupAddress(StackFrame *frame) const {
// WFI: WindowsFrameInfo.
// Returns a WFI object reading from a raw memory chunk of data
WindowsFrameInfo FastSourceLineResolver::CopyWFI(const char *raw) {
// The first 4Bytes of int data are unused.
// They corresponds to "int valid;" data member of WFI.
const WindowsFrameInfo::StackInfoTypes type =
static_cast<const WindowsFrameInfo::StackInfoTypes>(
*reinterpret_cast<const int32_t*>(raw));
// The first 8 bytes of int data are unused.
// They correspond to "StackInfoTypes type_;" and "int valid;"
// data member of WFI.
const u_int32_t *para_uint32 = reinterpret_cast<const u_int32_t*>(
raw + sizeof(int32_t));
raw + 2 * sizeof(int32_t));
u_int32_t prolog_size = para_uint32[0];;
u_int32_t epilog_size = para_uint32[1];
@ -122,7 +127,8 @@ WindowsFrameInfo FastSourceLineResolver::CopyWFI(const char *raw) {
bool allocates_base_pointer = (*boolean != 0);
std::string program_string = boolean + 1;
return WindowsFrameInfo(prolog_size,
return WindowsFrameInfo(type,
prolog_size,
epilog_size,
parameter_size,
saved_register_size,