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check pointer's validity. clean-up unused bits in parameter's value

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This commit is contained in:
nnosov
2020-04-25 07:38:46 +04:00
parent 41d8a846fb
commit 7206abc6a9
1 changed files with 24 additions and 9 deletions
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src/dwarf/dwarf_parameter.c
+21 -6
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@@ -9,6 +9,7 @@
#include <dwarf.h>
#include <elfutils/libdw.h>
#include "common.h"
#include "dwarf_utils.h"
#include "context.h"
#include "dwarf_parameter.h"
@@ -166,6 +167,11 @@ void parameter_print(pst_parameter* param)
if(param->info.flags & PARAM_HAS_VALUE) {
param->ctx->print(param->ctx, "0x%lX", param->info.value);
// don't take care on NULL pointer since obviously it's invalid
if((param->info.flags & PARAM_INVALID) && param->info.value != 0) {
param->ctx->print(param->ctx, " <invalid>");
}
} else {
param->ctx->print(param->ctx, "<undefined>");
}
@@ -286,17 +292,16 @@ bool parameter_handle_type(pst_parameter* param, Dwarf_Die* result)
return false;
}
param->info.size = 64;
switch (dwarf_tag(&ret_die)) {
// base types
case DW_TAG_base_type: {
// get Size attribute and it's value
param->info.size = 8;
attr = dwarf_attr(&ret_die, DW_AT_byte_size, &attr_mem);
if(attr) {
dwarf_formudata(attr, &param->info.size);
}
pst_log(SEVERITY_DEBUG, "%s: Base type '%s'(%lu)", __FUNCTION__, dwarf_diename(&ret_die), param->info.size);
switch (dwarf_tag(&ret_die)) {
// base types
case DW_TAG_base_type: {
const char* type_name = dwarf_diename(&ret_die);
attr = dwarf_attr(&ret_die, DW_AT_encoding, &attr_mem);
if(attr) {
@@ -379,6 +384,8 @@ bool parameter_handle_type(pst_parameter* param, Dwarf_Die* result)
break;
}
pst_log(SEVERITY_DEBUG, "%s: Parameter type '%s'(%lu) flags = 0x%X", __FUNCTION__, dwarf_diename(&ret_die), param->info.size, param->info.flags);
if(dwarf_hasattr(&ret_die, DW_AT_type)) {
// handle parameter's sub-type
return parameter_handle_type(param, &ret_die);
@@ -444,7 +451,15 @@ bool parameter_handle_dwarf(pst_parameter* param, Dwarf_Die* result, pst_functio
}
}
//param->info.value &=0xFFFFFFFFFFFFFFFF >> (64 - ((param->info.size * 8) & 0x0F));
// check pointer validity
if((param->info.flags & (PARAM_TYPE_POINTER | PARAM_TYPE_FUNCPTR)) && pst_pointer_valid((void*)param->info.value)) {
param->info.flags |= PARAM_INVALID;
}
// clean-up unused bits in parameter's value
if(!(param->info.flags & (PARAM_TYPE_POINTER | PARAM_TYPE_FUNCPTR))) {
param->info.value &= 0xFFFFFFFFFFFFFFFF >> (64 - ((param->info.size * 8) & 0x3F));
}
// hack since DWARF has no ability to determine 'void' it another way
if(!param->info.type_name) {