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Refactor some bits of StackWalkerX86 / StackFrameX86 out into their respective parent classes so they can be used by other architecture implementations.

Browse source 
R=jimb at http://breakpad.appspot.com/205001/show

git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@703 4c0a9323-5329-0410-9bdc-e9ce6186880e
This commit is contained in:
ted.mielczarek 2010-10-01 13:01:57 +00:00
parent de2c055770
commit 8c33b3e9c9
13 changed files with 118 additions and 113 deletions
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39
src/google_breakpad/processor/stack_frame.h
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@ -40,6 +40,19 @@ class CodeModule;
using std::string;
struct StackFrame {
// Indicates how well the instruction pointer derived during
// stack walking is trusted. Since the stack walker can resort to
// stack scanning, it can wind up with dubious frames.
// In rough order of "trust metric".
enum FrameTrust {
FRAME_TRUST_NONE, // Unknown
FRAME_TRUST_SCAN, // Scanned the stack, found this
FRAME_TRUST_CFI_SCAN, // Scanned the stack using call frame info, found this
FRAME_TRUST_FP, // Derived from frame pointer
FRAME_TRUST_CFI, // Derived from call frame info
FRAME_TRUST_CONTEXT // Given as instruction pointer in a context
};
StackFrame()
: instruction(),
module(NULL),
@ -47,9 +60,29 @@ struct StackFrame {
function_base(),
source_file_name(),
source_line(),
source_line_base() {}
source_line_base(),
trust(FRAME_TRUST_NONE) {}
virtual ~StackFrame() {}
// Return a string describing how this stack frame was found
// by the stackwalker.
string trust_description() const {
switch (trust) {
case StackFrame::FRAME_TRUST_NONE:
return "unknown";
case StackFrame::FRAME_TRUST_CONTEXT:
return "given as instruction pointer in context";
case StackFrame::FRAME_TRUST_CFI:
return "call frame info";
case StackFrame::FRAME_TRUST_CFI_SCAN:
return "call frame info with scanning";
case StackFrame::FRAME_TRUST_FP:
return "previous frame's frame pointer";
case StackFrame::FRAME_TRUST_SCAN:
return "stack scanning";
}
};
// The program counter location as an absolute virtual address. For the
// innermost called frame in a stack, this will be an exact program counter
// or instruction pointer value. For all other frames, this will be within
@ -77,6 +110,10 @@ struct StackFrame {
// The start address of the source line, may be omitted if debug symbols
// are not available.
u_int64_t source_line_base;
// Amount of trust the stack walker has in the instruction pointer
// of this frame.
FrameTrust trust;
};
} // namespace google_breakpad