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This will make enabling \\\"modern\\\" `libbpf` features - e.g. global variables - significantly easier and by its nature would make an AOT-compiled mode for bcc straightforward. bcc programs should be able to use this mode with minimal code changes.\\r\\n\\r\\nIn order to do this we need to support libbpf-style `SEC` attribute annotations, which requires some modification of internal loader/bookkeeping plumbing. The summary of the major commit in this branch elaborates:\\r\\n\\r\\n```\\r\\nbcc currently identifies each individual BPF prog in an object file by\\r\\nputting the prog in a special \\\".bpf.fn.$FUNC_NAME\\\" section when\\r\\npreprocessing the AST. After JITting an object file, the location and\\r\\nsize of the section are considered to be \\\"the function's insns\\\".\\r\\n\\r\\nIn order to support libbpf-style loading, we need to support its\\r\\nsec_def-style SEC() attributes e.g. SEC(\\\"tp_btf/softirq_entry\\\"), which\\r\\nallow libbpf to determine the type of BPF prog - and often other\\r\\ninformation like where to attach - based on the section name. These are\\r\\nnot guaranteed to be unique per function, so we can no longer assume\\r\\nthat a section contains only one function.\\r\\n\\r\\nThis commit gets rid of that assumption. bcc now finds the symbol in the\\r\\nJITed image matching each BPF prog function and uses it to determine\\r\\nsize/location.\\r\\n\\r\\nAlso, this commit only adds the \\\".bpf.fn.$FUNC_NAME\\\" section attribute\\r\\niff there isn't already a custom section attribute set.\\r\\n```\\r\\n\\r\\n__Status:__ I need to address a few things before this is in a mergeable state\\r\\n * [x] Does `BPFModule` still need `sections_`? If not, let's get rid of it\\r\\n * [ ] Need to clean up `prog_func_info_`-owned memory similarly to `sections_` now (when not using `rw_engine`)\\r\\n * [x] Custom section names should not break execution, but they do currently\\r\\n * [ ] debug dump (`SOURCE_DEBUG`) should work w/ custom sec names\\r\\n * Sanity check rest of debug flags too\\r\\n * [ ] Figure out correct LLVM version checks\\r\\n * [ ] Test on all python tools and some cpp applications" }, { "_class" : "hudson.model.StringParameterValue", "name" : "ghprbCommentBody", "value" : "null" }, { "_class" : "hudson.model.StringParameterValue", "name" : "ghprbGhRepository", "value" : "iovisor/bcc" }, { "_class" : "hudson.model.StringParameterValue", "name" : "ghprbCredentialsId", "value" : "6d3daf13-69b8-48b1-9c8f-ec5353264113" } ] }, { }, { "_class" : "jenkins.model.InterruptedBuildAction" }, { }, { "_class" : "org.jenkinsci.plugins.displayurlapi.actions.RunDisplayAction" } ], "artifacts" : [ ], "building" : False, "description" : "PR #3660: bcc internals: Keep track o...", "displayName" : "#1208", "duration" : 99595290, "estimatedDuration" : 7460664, "executor" : None, "fullDisplayName" : "bcc-pr #1208", "id" : "1208", "keepLog" : False, "number" : 1208, "queueId" : 9673, "result" : "ABORTED", "timestamp" : 1635791691044, "url" : "https://buildbot.iovisor.org/jenkins/user/ethercflow/my-views/view/all/job/bcc-pr/1208/", "builtOn" : "", "changeSet" : { "_class" : "hudson.plugins.git.GitChangeSetList", "items" : [ ], "kind" : "git" }, "culprits" : [ ], "runs" : [ { "number" : 1208, "url" : "https://buildbot.iovisor.org/jenkins/user/ethercflow/my-views/view/all/job/bcc-pr/label=fc25/1208/" }, { "number" : 1208, "url" : "https://buildbot.iovisor.org/jenkins/user/ethercflow/my-views/view/all/job/bcc-pr/label=fc26/1208/" }, { "number" : 1208, "url" : "https://buildbot.iovisor.org/jenkins/user/ethercflow/my-views/view/all/job/bcc-pr/label=fc27/1208/" }, { "number" : 1208, "url" : "https://buildbot.iovisor.org/jenkins/user/ethercflow/my-views/view/all/job/bcc-pr/label=fc28/1208/" }, { "number" : 1208, "url" : "https://buildbot.iovisor.org/jenkins/user/ethercflow/my-views/view/all/job/bcc-pr/label=ubuntu1604/1208/" }, { "number" : 1208, "url" : "https://buildbot.iovisor.org/jenkins/user/ethercflow/my-views/view/all/job/bcc-pr/label=ubuntu1710/1208/" }, { "number" : 1208, "url" : "https://buildbot.iovisor.org/jenkins/user/ethercflow/my-views/view/all/job/bcc-pr/label=ubuntu1804/1208/" } ] }