[New IC] Optimize Java class snapshotting with ASM ClassWriter

To snapshot a Java class (+ its fields and methods), previously we used
Gson to serialize a class field/method to a string via reflection, and
hash that string.

We now use an ASM ClassWriter to write a placeholder class containing
the field/method of interest and hash the bytecode of that class.

One experiment showed that this new approach is ~10 times faster than
the previous approach (140s down to 16s when snapshotting 600 jars).

Test: Updated expectation files for JavaClassSnapshotterTest unit tests
      + Existing integration tests to prevent regression

^KT-52141 In Progress
This commit is contained in:
Hung Nguyen
2022-04-21 16:43:58 +01:00
committed by teamcity
parent 5a0c3920a5
commit 9eb3c7ed76
8 changed files with 74 additions and 96 deletions
@@ -12,7 +12,7 @@
},
"local": false
},
"classAbiHash": 2419143040117344894,
"classAbiHash": -6515999856905133685,
"supertypes": [
{
"internalName": "java/lang/Object"
@@ -12,30 +12,26 @@
},
"local": false
},
"classAbiHash": 7253633932031152470,
"classAbiHash": -6515999856905133685,
"classMemberLevelSnapshot": {
"classAbiExcludingMembers": {
"abiValue": "{\n \"version\": 52,\n \"access\": 33,\n \"name\": \"com/example/SimpleClass\",\n \"superName\": \"java/lang/Object\",\n \"interfaces\": [],\n \"sourceFile\": \"SimpleClass.java\",\n \"innerClasses\": [],\n \"fields\": [],\n \"methods\": [],\n \"api\": 589824\n}",
"name": "com/example/SimpleClass",
"abiHash": -1986494095366785349
"abiHash": 8734303838782665320
},
"fieldsAbi": [
{
"abiValue": "{\n \"access\": 1,\n \"name\": \"publicField\",\n \"desc\": \"Ljava/lang/String;\",\n \"api\": 589824\n}",
"name": "publicField",
"abiHash": 1021768301411937004
"abiHash": 8370167348140025367
}
],
"methodsAbi": [
{
"abiValue": "{\n \"access\": 1,\n \"name\": \"\\u003cinit\\u003e\",\n \"desc\": \"()V\",\n \"exceptions\": [],\n \"visibleAnnotableParameterCount\": 0,\n \"invisibleAnnotableParameterCount\": 0,\n \"instructions\": {\n \"size\": 0\n },\n \"tryCatchBlocks\": [],\n \"maxStack\": 0,\n \"maxLocals\": 0,\n \"localVariables\": [],\n \"visited\": false,\n \"api\": 589824\n}",
"name": "\u003cinit\u003e",
"abiHash": 5725188035643409224
"abiHash": 2413123887428571534
},
{
"abiValue": "{\n \"access\": 1,\n \"name\": \"publicMethod\",\n \"desc\": \"()Ljava/lang/String;\",\n \"exceptions\": [],\n \"visibleAnnotableParameterCount\": 0,\n \"invisibleAnnotableParameterCount\": 0,\n \"instructions\": {\n \"size\": 0\n },\n \"tryCatchBlocks\": [],\n \"maxStack\": 0,\n \"maxLocals\": 0,\n \"localVariables\": [],\n \"visited\": false,\n \"api\": 589824\n}",
"name": "publicMethod",
"abiHash": 8210873051092995586
"abiHash": 7574889098198027162
}
]
},