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test: fix subtle bug in testplan.cpp

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testplan.cpp had a subtle bug since converting from a fixed-size
cylinder table to a dynamic cylinder table.

As noted in equipment.h, pointers to cylinders are *not* stable
when the cylinder table grows. Therefore, a construct such as
        cylinder_t *cyl0 = get_or_create_cylinder(&dive, 0);
        cylinder_t *cyl1 = get_or_create_cylinder(&dive, 1);
        cylinder_t *cyl2 = get_or_create_cylinder(&dive, 2);
can give dangling cyl0 and cyl1 pointers. This was not an issue
with the old table code, since it had a rather liberal allocation
pattern. However, when switching to std::vector<>, the problem
becomes active.

To "fix" this, simply access the highest index first. Of course,
this should never be done in real code! Therefore, add a
comment at each instance.

Quickly checked all other get_or_create_cylinder() calls and
they seemed to be safe.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
This commit is contained in:
Berthold Stoeger 2024-05-31 18:51:03 +02:00 committed by bstoeger
parent d27451979d
commit 9243921cbb
1 changed files with 40 additions and 10 deletions
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50
tests/testplan.cpp
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@ -52,9 +52,12 @@ void setupPlan(struct diveplan *dp)
struct gasmix ean36 = {{360}, {0}};
struct gasmix oxygen = {{1000}, {0}};
pressure_t po2 = {1600};
// Note: we add the highest-index cylinder first, because
// pointers to cylinders are not stable when reallocating.
// For testing OK - don't do this in actual code!
cylinder_t *cyl2 = get_or_create_cylinder(&dive, 2);
cylinder_t *cyl0 = get_or_create_cylinder(&dive, 0);
cylinder_t *cyl1 = get_or_create_cylinder(&dive, 1);
cylinder_t *cyl2 = get_or_create_cylinder(&dive, 2);
cyl0->gasmix = bottomgas;
cyl0->type.size.mliter = 36000;
cyl0->type.workingpressure.mbar = 232000;
@ -83,9 +86,12 @@ void setupPlanVpmb45m30mTx(struct diveplan *dp)
struct gasmix ean50 = {{500}, {0}};
struct gasmix oxygen = {{1000}, {0}};
pressure_t po2 = {1600};
// Note: we add the highest-index cylinder first, because
// pointers to cylinders are not stable when reallocating.
// For testing OK - don't do this in actual code!
cylinder_t *cyl2 = get_or_create_cylinder(&dive, 2);
cylinder_t *cyl0 = get_or_create_cylinder(&dive, 0);
cylinder_t *cyl1 = get_or_create_cylinder(&dive, 1);
cylinder_t *cyl2 = get_or_create_cylinder(&dive, 2);
cyl0->gasmix = bottomgas;
cyl0->type.size.mliter = 24000;
cyl0->type.workingpressure.mbar = 232000;
@ -114,9 +120,12 @@ void setupPlanVpmb60m10mTx(struct diveplan *dp)
struct gasmix tx50_15 = {{500}, {150}};
struct gasmix oxygen = {{1000}, {0}};
pressure_t po2 = {1600};
// Note: we add the highest-index cylinder first, because
// pointers to cylinders are not stable when reallocating.
// For testing OK - don't do this in actual code!
cylinder_t *cyl2 = get_or_create_cylinder(&dive, 2);
cylinder_t *cyl0 = get_or_create_cylinder(&dive, 0);
cylinder_t *cyl1 = get_or_create_cylinder(&dive, 1);
cylinder_t *cyl2 = get_or_create_cylinder(&dive, 2);
cyl0->gasmix = bottomgas;
cyl0->type.size.mliter = 24000;
cyl0->type.workingpressure.mbar = 232000;
@ -163,8 +172,11 @@ void setupPlanVpmb60m30minEan50(struct diveplan *dp)
struct gasmix bottomgas = {{210}, {0}};
struct gasmix ean50 = {{500}, {0}};
pressure_t po2 = {1600};
cylinder_t *cyl0 = get_or_create_cylinder(&dive, 0);
// Note: we add the highest-index cylinder first, because
// pointers to cylinders are not stable when reallocating.
// For testing OK - don't do this in actual code!
cylinder_t *cyl1 = get_or_create_cylinder(&dive, 1);
cylinder_t *cyl0 = get_or_create_cylinder(&dive, 0);
cyl0->gasmix = bottomgas;
cyl0->type.size.mliter = 36000;
cyl0->type.workingpressure.mbar = 232000;
@ -189,8 +201,11 @@ void setupPlanVpmb60m30minTx(struct diveplan *dp)
struct gasmix bottomgas = {{180}, {450}};
struct gasmix ean50 = {{500}, {0}};
pressure_t po2 = {1600};
cylinder_t *cyl0 = get_or_create_cylinder(&dive, 0);
// Note: we add the highest-index cylinder first, because
// pointers to cylinders are not stable when reallocating.
// For testing OK - don't do this in actual code!
cylinder_t *cyl1 = get_or_create_cylinder(&dive, 1);
cylinder_t *cyl0 = get_or_create_cylinder(&dive, 0);
cyl0->gasmix = bottomgas;
cyl0->type.size.mliter = 36000;
cyl0->type.workingpressure.mbar = 232000;
@ -239,9 +254,12 @@ void setupPlanVpmb100m60min(struct diveplan *dp)
struct gasmix ean50 = {{500}, {0}};
struct gasmix oxygen = {{1000}, {0}};
pressure_t po2 = {1600};
// Note: we add the highest-index cylinder first, because
// pointers to cylinders are not stable when reallocating.
// For testing OK - don't do this in actual code!
cylinder_t *cyl2 = get_or_create_cylinder(&dive, 2);
cylinder_t *cyl0 = get_or_create_cylinder(&dive, 0);
cylinder_t *cyl1 = get_or_create_cylinder(&dive, 1);
cylinder_t *cyl2 = get_or_create_cylinder(&dive, 2);
cyl0->gasmix = bottomgas;
cyl0->type.size.mliter = 200000;
cyl0->type.workingpressure.mbar = 232000;
@ -269,9 +287,12 @@ void setupPlanVpmb100m10min(struct diveplan *dp)
struct gasmix ean50 = {{500}, {0}};
struct gasmix oxygen = {{1000}, {0}};
pressure_t po2 = {1600};
// Note: we add the highest-index cylinder first, because
// pointers to cylinders are not stable when reallocating.
// For testing OK - don't do this in actual code!
cylinder_t *cyl2 = get_or_create_cylinder(&dive, 2);
cylinder_t *cyl0 = get_or_create_cylinder(&dive, 0);
cylinder_t *cyl1 = get_or_create_cylinder(&dive, 1);
cylinder_t *cyl2 = get_or_create_cylinder(&dive, 2);
cyl0->gasmix = bottomgas;
cyl0->type.size.mliter = 60000;
cyl0->type.workingpressure.mbar = 232000;
@ -321,10 +342,13 @@ void setupPlanVpmb100mTo70m30min(struct diveplan *dp)
struct gasmix ean50 = {{500}, {0}};
struct gasmix oxygen = {{1000}, {0}};
pressure_t po2 = {1600};
// Note: we add the highest-index cylinder first, because
// pointers to cylinders are not stable when reallocating.
// For testing OK - don't do this in actual code!
cylinder_t *cyl3 = get_or_create_cylinder(&dive, 3);
cylinder_t *cyl0 = get_or_create_cylinder(&dive, 0);
cylinder_t *cyl1 = get_or_create_cylinder(&dive, 1);
cylinder_t *cyl2 = get_or_create_cylinder(&dive, 2);
cylinder_t *cyl3 = get_or_create_cylinder(&dive, 3);
cyl0->gasmix = bottomgas;
cyl0->type.size.mliter = 36000;
cyl0->type.workingpressure.mbar = 232000;
@ -357,8 +381,11 @@ void setupPlanSeveralGases(struct diveplan *dp)
struct gasmix ean36 = {{360}, {0}};
struct gasmix tx11_50 = {{110}, {500}};
cylinder_t *cyl0 = get_or_create_cylinder(&dive, 0);
// Note: we add the highest-index cylinder first, because
// pointers to cylinders are not stable when reallocating.
// For testing OK - don't do this in actual code!
cylinder_t *cyl1 = get_or_create_cylinder(&dive, 1);
cylinder_t *cyl0 = get_or_create_cylinder(&dive, 0);
cyl0->gasmix = ean36;
cyl0->type.size.mliter = 36000;
cyl0->type.workingpressure.mbar = 232000;
@ -386,9 +413,12 @@ void setupPlanCcr(struct diveplan *dp)
struct gasmix diluent = {{200}, {210}};
struct gasmix ean53 = {{530}, {0}};
struct gasmix tx19_33 = {{190}, {330}};
// Note: we add the highest-index cylinder first, because
// pointers to cylinders are not stable when reallocating.
// For testing OK - don't do this in actual code!
cylinder_t *cyl2 = get_or_create_cylinder(&dive, 2);
cylinder_t *cyl0 = get_or_create_cylinder(&dive, 0);
cylinder_t *cyl1 = get_or_create_cylinder(&dive, 1);
cylinder_t *cyl2 = get_or_create_cylinder(&dive, 2);
cyl0->gasmix = diluent;
cyl0->depth = gas_mod(diluent, po2, &dive, M_OR_FT(3, 10));
cyl0->type.size.mliter = 3000;