Re: [tcf-dev] breakpoints / access types

[Eugene Tarassov <eugene.tarassov@xxxxxxxxxx>]

Hi Samuel,

> in context_plant_breakpoint() I need to know which breakpoint type

Use iterate_context_breakpoint_links() and get_breakpoint_attributes() to get all breakpoint attributes.

For example:

    iterate_context_breakpoint_links(ctx, cb, bp_link_cb, NULL);

static void bp_link_cb(BreakpointInfo * bi, void * x) {
    BreakpointAttribute * attrs = get_breakpoint_attributes(bi);
    while (attrs != NULL) {
        if (strcmp(attrs->name, BREAKPOINT_TYPE) == 0) {
            if (strcmp(attrs->value, "\"Hardware\"") == 0) hardware = 1;
            if (strcmp(attrs->value, "\"Software\"") == 0) software = 1;
        }
        attrs = attrs->next;
    }
}

Regards,
Eugene

-----Original Message-----
From: tcf-dev-bounces@xxxxxxxxxxx [mailto:tcf-dev-bounces@xxxxxxxxxxx] On Behalf Of Samuel Ghinet
Sent: Thursday, October 08, 2015 1:51 AM
To: tcf-dev@xxxxxxxxxxx
Subject: Re: [tcf-dev] breakpoints / access types

Hi Eugene,

 > When breakpoint type is "Auto", the breakpoints service asks debugger
backend to plant it as hardware bp. If backend rejects the request and
returns ERR_UNSUPPORTED, it is planted as software bp. Basically, your
implementation of context_plant_breakpoint() decides how to plant "Auto"
breakpoint by either planting it or returning ERR_UNSUPPORTED.

The debugger I'm working on is for a specific hardware which has support
for both software and hardware breakpoints. Therefore, in
context_plant_breakpoint() I need to know which breakpoint type the user
had requested: If he asked for a hardware breakpoint specifically, then
I can't insert a software breakpoint; if the user asked specifically for
a software breakpoint, then I can't insert a hardware breakpoint; and if
the user just let the default / did not specify, which translates as the
"Auto" type, then I need to know that it was "Auto", so that I can
insert a software breakpoint (this is a requirement).

The problem I'm having is that, in context_plant_breakpoint(), the
access_types is the same, whether the user had asked specifically for a
hardware breakpoint or left the default, so I can't know what the user
wanted. And I need to interpret the default ("Auto") as "Software"

I'm thinking that, if the CTX_BP_ACCESS_* also had a CTX_BP_ACCESS_AUTO,
it would allow the debugger implementations to choose for themselves
what the default should translate to.

Thanks,
Samuel
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