Implement output tracing for generator bail-in #6183
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MikeHolman
reviewed
Jun 27, 2019
MikeHolman
reviewed
Jun 27, 2019
Since bailing in happens in the jit'd code, we have to generate code to output the trace. If tracing is enabled, we will fill the array of bail-in symbols in the generator instance (`bailInSymbolsTraceArray`) with their ids and values and finally output them with a call to a runtime helper. `-trace:bailin` together with `-trace:bailout -verbose` can help us easily debug jit'd generators by comparing the values when bailing out for `yield` and bailing in: ``` BailOut: function: func68 ( (chakra-core#1.1), chakra-core#2) offset: #003f Opcode: Yield Kind: BailOutForGeneratorYield BailOut: Register # 0: Not live BailOut: Register # 1: Constant table BailOut: Register # 2: Register r15 16, value: 0x0000023CE132EEA0 (Yield Return Value) BailOut: Register # 3: Register r12 13, value: 0x0001000000000004 BailOut: Return Value: 0x0000023CE132EEA0 BailIn: function: func68 ( (chakra-core#1.1), chakra-core#2) offset: chakra-core#42 BailIn: Register # 3, value: 0x0001000000000004 ``` ``` BailOut: function: func68 ( (chakra-core#1.1), chakra-core#2) offset: #006b Opcode: Yield Kind: BailOutForGeneratorYield BailOut: Register # 0: Not live BailOut: Register # 1: Constant table BailOut: Register # 3: Register r15 16, value: 0x0000023CE133E060 (Yield Return Value) BailOut: Return Value: 0x0000023CE133E060 BailIn: function: func68 ( (chakra-core#1.1), chakra-core#2) offset: #006e BailIn: No symbols reloaded ```
chakrabot
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Jul 2, 2019
…l-in Merge pull request #6183 from nhat-nguyen:trace Since bailing in happens in the jit'd code, we have to generate code to output the trace. If tracing is enabled, we will fill the array of bail-in symbols in the generator instance (`bailInSymbolsTraceArray`) with their ids and values and finally output them with a call to a runtime helper. `-trace:bailin` together with `-trace:bailout -verbose` can help us easily debug jit'd generators by comparing the values when bailing out for `yield` and bailing in: ``` BailOut: function: func68 ( (#1.1), #2) offset: #003f Opcode: Yield Kind: BailOutForGeneratorYield BailOut: Register # 0: Not live BailOut: Register # 1: Constant table BailOut: Register # 2: Register r15 16, value: 0x0000023CE132EEA0 (Yield Return Value) BailOut: Register # 3: Register r12 13, value: 0x0001000000000004 BailOut: Return Value: 0x0000023CE132EEA0 BailIn: function: func68 ( (#1.1), #2) offset: #42 BailIn: Register # 3, value: 0x0001000000000004 ``` ``` BailOut: function: func68 ( (#1.1), #2) offset: #006b Opcode: Yield Kind: BailOutForGeneratorYield BailOut: Register # 0: Not live BailOut: Register # 1: Constant table BailOut: Register # 3: Register r15 16, value: 0x0000023CE133E060 (Yield Return Value) BailOut: Return Value: 0x0000023CE133E060 BailIn: function: func68 ( (#1.1), #2) offset: #006e BailIn: No symbols reloaded ```
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Since bailing in happens in the jit'd code, we have to generate code to output the trace. If tracing is enabled, we will fill the array of bail-in symbols in the generator instance (
bailInSymbolsTraceArray) with their ids and values and finally output them with a call to a runtime helper.-trace:bailintogether with-trace:bailout -verbosecan help us easily debug jit'd generators by comparing the values when bailing out foryieldand bailing in: