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nir/serialize: Prevent writing uninitialized state_slot data

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The nir_state_slot struct had some padding that was never initialized.
Serializing the individual parts of the struct is more robust and avoids
the overhead of zeroing it at creation, so just do that.

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
This commit is contained in:
Connor Abbott 2019-03-08 13:05:53 +01:00
parent 47fc359822
commit d086d16b81
1 changed files with 14 additions and 5 deletions
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19
src/compiler/nir/nir_serialize.c
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@ -141,8 +141,11 @@ write_variable(write_ctx *ctx, const nir_variable *var)
blob_write_string(ctx->blob, var->name);
blob_write_bytes(ctx->blob, (uint8_t *) &var->data, sizeof(var->data));
blob_write_uint32(ctx->blob, var->num_state_slots);
blob_write_bytes(ctx->blob, (uint8_t *) var->state_slots,
var->num_state_slots * sizeof(nir_state_slot));
for (unsigned i = 0; i < var->num_state_slots; i++) {
for (unsigned j = 0; j < STATE_LENGTH; j++)
blob_write_uint32(ctx->blob, var->state_slots[i].tokens[j]);
blob_write_uint32(ctx->blob, var->state_slots[i].swizzle);
}
blob_write_uint32(ctx->blob, !!(var->constant_initializer));
if (var->constant_initializer)
write_constant(ctx, var->constant_initializer);
@ -172,9 +175,15 @@ read_variable(read_ctx *ctx)
}
blob_copy_bytes(ctx->blob, (uint8_t *) &var->data, sizeof(var->data));
var->num_state_slots = blob_read_uint32(ctx->blob);
var->state_slots = ralloc_array(var, nir_state_slot, var->num_state_slots);
blob_copy_bytes(ctx->blob, (uint8_t *) var->state_slots,
var->num_state_slots * sizeof(nir_state_slot));
if (var->num_state_slots != 0) {
var->state_slots = ralloc_array(var, nir_state_slot,
var->num_state_slots);
for (unsigned i = 0; i < var->num_state_slots; i++) {
for (unsigned j = 0; j < STATE_LENGTH; j++)
var->state_slots[i].tokens[j] = blob_read_uint32(ctx->blob);
var->state_slots[i].swizzle = blob_read_uint32(ctx->blob);
}
}
bool has_const_initializer = blob_read_uint32(ctx->blob);
if (has_const_initializer)
var->constant_initializer = read_constant(ctx, var);