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Let x86 stackwalker scan stack in cases where program evaluation fails. Original patch by Jeff Muizelaar <jmuizelaar@mozilla.com> with some changes by me. r=mento at http://breakpad.appspot.com/32003/show

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git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@409 4c0a9323-5329-0410-9bdc-e9ce6186880e
This commit is contained in:
ted.mielczarek 2009-10-08 14:21:50 +00:00
parent 760d66430e
commit 8d70618ffc
7 changed files with 161 additions and 27 deletions
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22
src/google_breakpad/processor/stack_frame_cpu.h
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@ -58,7 +58,23 @@ struct StackFrameX86 : public StackFrame {
CONTEXT_VALID_ALL = -1
};
StackFrameX86() : context(), context_validity(CONTEXT_VALID_NONE) {}
// Indicates how well we trust the instruction pointer we derived
// during stack walking. Since the stack walker can resort to
// stack scanning, we 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
};
StackFrameX86()
: context(),
context_validity(CONTEXT_VALID_NONE),
trust(FRAME_TRUST_NONE) {}
// Register state. This is only fully valid for the topmost frame in a
// stack. In other frames, the values of nonvolatile registers may be
@ -70,6 +86,10 @@ struct StackFrameX86 : public StackFrame {
// the OR operator doesn't work well with enumerated types. This indicates
// which fields in context are valid.
int context_validity;
// Amount of trust the stack walker has in the instruction pointer
// of this frame.
FrameTrust trust;
};
struct StackFramePPC : public StackFrame {