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-rw-r--r--erts/emulator/beam/erl_bif_trace.c11
-rw-r--r--erts/emulator/beam/sys.h3
2 files changed, 7 insertions, 7 deletions
diff --git a/erts/emulator/beam/erl_bif_trace.c b/erts/emulator/beam/erl_bif_trace.c
index ff2018aa27..09c82ad206 100644
--- a/erts/emulator/beam/erl_bif_trace.c
+++ b/erts/emulator/beam/erl_bif_trace.c
@@ -1307,7 +1307,7 @@ erts_set_trace_pattern(Process*p, Eterm* mfa, int specified,
for (i = 0; i < n; i++) {
BeamInstr* pc = fp[i].pc;
- Export* ep = (Export *)(((char *)(pc-3)) - offsetof(Export, code));
+ Export* ep = ErtsContainerStruct(pc, Export, code[3]);
if (on && !flags.breakpoint) {
/* Turn on global call tracing */
@@ -1556,11 +1556,10 @@ install_exp_breakpoints(BpFunctions* f)
BpFunction* fp = f->matching;
Uint ne = f->matched;
Uint i;
- Uint offset = offsetof(Export, code) + 3*sizeof(BeamInstr);
for (i = 0; i < ne; i++) {
BeamInstr* pc = fp[i].pc;
- Export* ep = (Export *) (((char *)pc)-offset);
+ Export* ep = ErtsContainerStruct(pc, Export, code[3]);
ep->addressv[code_ix] = pc;
}
@@ -1573,11 +1572,10 @@ uninstall_exp_breakpoints(BpFunctions* f)
BpFunction* fp = f->matching;
Uint ne = f->matched;
Uint i;
- Uint offset = offsetof(Export, code) + 3*sizeof(BeamInstr);
for (i = 0; i < ne; i++) {
BeamInstr* pc = fp[i].pc;
- Export* ep = (Export *) (((char *)pc)-offset);
+ Export* ep = ErtsContainerStruct(pc, Export, code[3]);
if (ep->addressv[code_ix] != pc) {
continue;
@@ -1594,11 +1592,10 @@ clean_export_entries(BpFunctions* f)
BpFunction* fp = f->matching;
Uint ne = f->matched;
Uint i;
- Uint offset = offsetof(Export, code) + 3*sizeof(BeamInstr);
for (i = 0; i < ne; i++) {
BeamInstr* pc = fp[i].pc;
- Export* ep = (Export *) (((char *)pc)-offset);
+ Export* ep = ErtsContainerStruct(pc, Export, code[3]);
if (ep->addressv[code_ix] == pc) {
continue;
diff --git a/erts/emulator/beam/sys.h b/erts/emulator/beam/sys.h
index 748fba15c7..dda3ba565c 100644
--- a/erts/emulator/beam/sys.h
+++ b/erts/emulator/beam/sys.h
@@ -92,6 +92,9 @@
#define ErtsInArea(ptr,start,nbytes) \
((UWord)((char*)(ptr) - (char*)(start)) < (nbytes))
+#define ErtsContainerStruct(ptr, type, member) \
+ (type *)((char *)(1 ? (ptr) : &((type *)0)->member) - offsetof(type, member))
+
#if defined (__WIN32__)
# include "erl_win_sys.h"
#else