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-rw-r--r--src/compiler/blob.c9
-rw-r--r--src/compiler/blob.h4
2 files changed, 10 insertions, 3 deletions
diff --git a/src/compiler/blob.c b/src/compiler/blob.c
index a78fcd41a76..f3ff5d6862e 100644
--- a/src/compiler/blob.c
+++ b/src/compiler/blob.c
@@ -91,7 +91,8 @@ align_blob(struct blob *blob, size_t alignment)
if (!grow_to_fit(blob, new_size - blob->size))
return false;
- memset(blob->data + blob->size, 0, new_size - blob->size);
+ if (blob->data)
+ memset(blob->data + blob->size, 0, new_size - blob->size);
blob->size = new_size;
}
@@ -136,7 +137,8 @@ blob_overwrite_bytes(struct blob *blob,
VG(VALGRIND_CHECK_MEM_IS_DEFINED(bytes, to_write));
- memcpy(blob->data + offset, bytes, to_write);
+ if (blob->data)
+ memcpy(blob->data + offset, bytes, to_write);
return true;
}
@@ -149,7 +151,8 @@ blob_write_bytes(struct blob *blob, const void *bytes, size_t to_write)
VG(VALGRIND_CHECK_MEM_IS_DEFINED(bytes, to_write));
- memcpy(blob->data + blob->size, bytes, to_write);
+ if (blob->data)
+ memcpy(blob->data + blob->size, bytes, to_write);
blob->size += to_write;
return true;
diff --git a/src/compiler/blob.h b/src/compiler/blob.h
index e23e392eedd..ec80b78284c 100644
--- a/src/compiler/blob.h
+++ b/src/compiler/blob.h
@@ -96,6 +96,10 @@ blob_init(struct blob *blob);
* A fixed-size blob has a fixed block of data that will not be freed on
* blob_finish and will never be grown. If we hit the end, we simply start
* returning false from the write functions.
+ *
+ * If a fixed-size blob has a NULL data pointer then the data is written but
+ * it otherwise operates normally. This can be used to determine the size
+ * that will be required to write a given data structure.
*/
void
blob_init_fixed(struct blob *blob, void *data, size_t size);