cfg2asm
cfg2asm is a tool for printing assembly from control flow-graph, or CFG, files dumped by the GraalVM compiler.
The C1Visualizer is the tool usually used to work with GraalVM control flow graphs. cfg2asm is an open-source equivalent that works from the command line.
cfg2asm was forked from Seafoam.
Installation
% brew install capstone # macOS
% sudo apt-get install libcapstone3 # Ubuntu < 21.04
% sudo apt-get install libcapstone4 # Ubuntu >= 21.04
% gem install cfg2asm
Use
-Dgraal.PrintBackendCFG=true for Java, or --vm.Dgraal.PrintBackendCFG=true for Truffle.
% cfg2asm examples/java/exampleArithOperator.cfg.gz
[examples/java/exampleArithOperator.cfg.gz]
;Comment 0: VERIFIED_ENTRY
0x124b8de80: nop dword ptr [rax + rax]
;Comment 5: block B0 null
;Comment 5: 0 [rsi|DWORD, rdx|DWORD, rbp|QWORD] = LABEL numbPhis: 0 align: false label: ?
;Comment 5: 4 [] = HOTSPOTLOCKSTACK frameMapBuilder: org.graalvm.compiler.lir.amd64.AMD64FrameMapBuilder@26ba755b slotKind: QWORD
;Comment 5: 10 rsi|DWORD = ADD (x: rsi|DWORD, y: rdx|DWORD) size: DWORD
0x124b8de85: add esi, edx
;Comment 7: 12 rax|DWORD = MOVE rsi|DWORD moveKind: DWORD
0x124b8de87: mov eax, esi
;Comment 9: 14 RETURN (savedRbp: rbp|QWORD, value: rax|DWORD) isStub: false requiresReservedStackAccessCheck: false thread: r15 scratchForSafepointOnReturn: rcx config: org.graalvm.compiler.hotspot.GraalHotSpotVMConfig@6c71283a
0x124b8de89: mov rcx, qword ptr [r15 + 0x108]
;Comment 16: POLL_RETURN_FAR
0x124b8de90: test dword ptr [rcx], eax
0x124b8de92: ret
;Comment 19: {Stub<ExceptionHandlerStub.exceptionHandler>@0x11a9b9980:CallingConvention[rax|QWORD[.], rdx|QWORD]:CallingConvention[rax|QWORD[.], rdx|QWORD]; temps=rdi|ILLEGAL,xmm14|ILLEGAL,xmm15|ILLEGAL,xmm12|ILLEGAL,xmm13|ILLEGAL,xmm10|ILLEGAL,xmm11|ILLEGAL,xmm7|ILLEGAL,xmm8|ILLEGAL,xmm9|ILLEGAL,xmm0|ILLEGAL,xmm1|ILLEGAL,xmm2|ILLEGAL,xmm3|ILLEGAL,xmm4|ILLEGAL,xmm5|ILLEGAL,xmm6|ILLEGAL,rax|ILLEGAL,rcx|ILLEGAL,rdx|ILLEGAL,rsi|ILLEGAL,r8|ILLEGAL,r9|ILLEGAL,r10|ILLEGAL,r11|ILLEGAL}
;Comment 19: EXCEPTION_HANDLER_ENTRY
0x124b8de93: call 0x11a9b9980
0x124b8de98: nop
;Comment 25: {Field[name=CompilerToVM::Data::SharedRuntime_deopt_blob_unpack, type=address, offset=0, address=0x10646a4d0, value=4740607520]:0x11a8fee20}
;Comment 25: DEOPT_HANDLER_ENTRY
0x124b8de99: call 0x11a8fee20
0x124b8de9e: nop
0x124b8de9f: hlt
Author
cfg2asm was written by Chris Seaton at Shopify, chris.seaton@shopify.com.
License
MIT