RFC: dwarf merge patch

Eric Pouech eric.pouech at orange.fr
Wed Jan 20 14:08:53 CST 2010

André Hentschel a écrit :
> Hi,
> I made a patch to merge code from ntdll/signal_x86_64.c to dbghelp/dwarf.c
> The operator DW_OP_deref_size needs to read different sizes of variables from memory into a fixed size variable.
> Now i am not sure if my solution is the smallest and easiest one, so i would be happy for every comment on this.
> http://www.winehq.org/pipermail/wine-patches/2010-January/083899.html
you could factorize all the calls to ReadProcessMemory into a single 
one, then use more explicit integral conversion

BYTE deref[8];
if (!ReadProcessMemory(hproc, (void*)addr, &deref, derefsize, NULL))
	WARN("Couldn't read memory at %lx\n", addr);
        return loc_err_cant_read;

switch (derefsize)
    case 1: stack[++stk] = *(unsigned char*)&deref; break;
    case 2: stack[++stk] = *(unsigned short*)&deref; break;
    case 4: stack[++stk] = *(DWORD*)&deref; break;
    case 8: stack[++stk] = *(DWORD64*)&deref; break;


Eric Pouech
"The problem with designing something completely foolproof is to underestimate the ingenuity of a complete idiot." (Douglas Adams)

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