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// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include <dlfcn.h>
#include <ctype.h>
#include <vespamalloc/util/callstack.h>
namespace vespamalloc {
const char * dlAddr(const void * func) {
static const char * _unknown = "UNKNOWN";
const char * funcName = _unknown;
Dl_info info;
int ret = dladdr(func, &info);
if (ret != 0) {
funcName = info.dli_sname;
}
return funcName;
}
const void * dlNextSym(const void * func)
{
const char * f = static_cast<const char *>(func);
size_t i(0);
bool done(false);
for( i = 0; !done; i++) {
Dl_info info;
int ret = dladdr(f+i, &info);
if (ret == 0) {
fprintf(stderr, "dladdr failed for %p\n", f+i);
}
done = (f != info.dli_saddr);
}
return f+i;
}
static void verifyAndCopy(const void * addr, char *v, size_t sz)
{
size_t pos(0);
const char * sym = dlAddr(addr);
for (;sym && (sym[pos] != '\0') && (pos < sz-1); pos++) {
char c(sym[pos]);
v[pos] = isprint(c) ? c : '.';
}
v[pos] = '\0';
}
void StackReturnEntry::info(FILE * os) const
{
static char tmp[0x400];
verifyAndCopy(_return, tmp, sizeof(tmp));
fprintf(os, "%s(%p)", tmp, _return);
}
asciistream & operator << (asciistream & os, const StackReturnEntry & v)
{
static char tmp[0x100];
static char t[0x200];
verifyAndCopy(v._return, tmp, sizeof(tmp));
snprintf(t, sizeof(t), "%s(%p)", tmp, v._return);
return os << t;
}
}
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