mirror/pstrace
4
0
Fork 0
Code Activity

handle DW_AT_low_pc & DW_AT_call_tail_call for call-site

Browse Source
This commit is contained in:
nnosov
2020-02-05 07:02:19 +04:00
parent 0d06b02747
commit c21c623be4
2 changed files with 13 additions and 9 deletions
Download Patch File Download Diff File Expand all files Collapse all files
framework/dwarf_call_site.cpp
+10 -8
View File
@@ -224,14 +224,6 @@ bool pst_call_site_storage_handle_dwarf(pst_call_site_storage* storage, Dwarf_Di
}
}
// if attribute is specified, then it's value is actually PC in caller's frame (address of invocation of callee)
if(dwarf_hasattr (result, DW_AT_low_pc) && dwarf_attr(result, DW_AT_low_pc, &attr_mem)) {
Dwarf_Addr low_pc;
if(!dwarf_formaddr(&attr_mem, &low_pc)) {
pst_log(SEVERITY_DEBUG, "DW_AT_low_pc: %#lX", low_pc);
}
}
if(target == 0 && oname == NULL) {
pst_log(SEVERITY_ERROR, "Cannot determine both call-site target and origin");
return false;
@@ -240,6 +232,16 @@ bool pst_call_site_storage_handle_dwarf(pst_call_site_storage* storage, Dwarf_Di
Dwarf_Die child;
if(dwarf_child (result, &child) == 0) {
pst_call_site* st = pst_call_site_storage_add(storage, target, oname);
st->tail_call = (dwarf_hasattr(result, DW_AT_call_tail_call) != 0);
// if DW_AT_low_pc attribute is specified, then it's value is actually PC in caller's frame (address of invocation of callee)
if(dwarf_hasattr (result, DW_AT_low_pc) && dwarf_attr(result, DW_AT_low_pc, &attr_mem)) {
if(!dwarf_formaddr(&attr_mem, &st->call_pc)) {
pst_log(SEVERITY_DEBUG, "DW_AT_low_pc: %#lX", st->call_pc);
}
}
if(!call_site_handle_dwarf(st, &child)) {
pst_call_site_storage_del(storage, st);
return false;
framework/dwarf_call_site.h
+3 -1
View File
@@ -48,8 +48,10 @@ typedef struct pst_call_site {
hash_node tgt_node; // uplink to call-site by node dictionary
hash_node org_node; // uplink to call-site by origin dictionary
uint64_t target; // pointer to callee function's (it's Low PC + base address)
uint64_t target; // pointer to callee function (it's Low PC + base address)
char* origin; // name of callee function
Dwarf_Addr call_pc; // address of 'call' instruction to callee inside of caller
bool tail_call; // whether this a tail-call (jump) or normal call 'call'
Dwarf_Die* die; // DIE of function for which this call site has parameters
list_head params; // list of parameters and their values
pst_context* ctx; // execution context