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dwarves: Add the DWARF location to struct variable 

This is DWARF specific, we don't have in CTF, AFAIK, info about where a
variable is put, i.e. in a register? in the stack? etc.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo 2018-09-05 15:35:05 -03:00
parent c65f2cf436
commit 465110ec99
2 changed files with 12 additions and 6 deletions
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12
dwarf_loader.c
View File

@ -543,15 +543,14 @@ static struct enumerator *enumerator__new(Dwarf_Die *die, struct cu *cu)
return enumerator;
}
static enum vscope dwarf__location(Dwarf_Die *die, uint64_t *addr)
static enum vscope dwarf__location(Dwarf_Die *die, uint64_t *addr, struct location *location)
{
Dwarf_Op *expr;
size_t exprlen;
enum vscope scope = VSCOPE_UNKNOWN;
if (attr_location(die, &expr, &exprlen) != 0)
if (attr_location(die, &location->expr, &location->exprlen) != 0)
scope = VSCOPE_OPTIMIZED;
else if (exprlen != 0)
else if (location->exprlen != 0) {
Dwarf_Op *expr = location->expr;
switch (expr->atom) {
case DW_OP_addr:
scope = VSCOPE_GLOBAL;
@ -563,6 +562,7 @@ static enum vscope dwarf__location(Dwarf_Die *die, uint64_t *addr)
case DW_OP_fbreg:
scope = VSCOPE_LOCAL; break;
}
}
return scope;
}
@ -586,7 +586,7 @@ static struct variable *variable__new(Dwarf_Die *die, struct cu *cu)
var->scope = VSCOPE_UNKNOWN;
var->ip.addr = 0;
if (!var->declaration && cu->has_addr_info)
var->scope = dwarf__location(die, &var->ip.addr);
var->scope = dwarf__location(die, &var->ip.addr, &var->location);
}
return var;

6
dwarves.h
View File

@ -579,12 +579,18 @@ enum vscope {
VSCOPE_OPTIMIZED
} __attribute__((packed));
struct location {
Dwarf_Op *expr;
size_t exprlen;
};
struct variable {
struct ip_tag ip;
strings_t name;
uint8_t external:1;
uint8_t declaration:1;
enum vscope scope;
struct location location;
struct hlist_node tool_hnode;
};