67de8b490d
The only architecture that actually needs special support for scanning the stack is WebAssembly. All others allow raw access to the stack with a small bit of assembly. Therefore, don't manually keep track of all these objects on the stack manually and instead just use conservative stack scanning. This results in a massive code size decrease in the affected targets (only tested linux/amd64 for code size) - sometimes around 33%. It also allows for future improvements such as using proper stackful goroutines.
23 строки
711 Б
ArmAsm
23 строки
711 Б
ArmAsm
.section .text.tinygo_scanCurrentStack
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.global tinygo_scanCurrentStack
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.type tinygo_scanCurrentStack, %function
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tinygo_scanCurrentStack:
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// Sources:
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// * https://developer.arm.com/architectures/learn-the-architecture/armv8-a-instruction-set-architecture/procedure-call-standard
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// * https://godbolt.org/z/qrvrEh
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// Save callee-saved registers.
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stp x29, x30, [sp, #-96]!
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stp x28, x27, [sp, #16]
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stp x26, x25, [sp, #32]
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stp x24, x23, [sp, #48]
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stp x22, x21, [sp, #64]
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stp x20, x19, [sp, #80]
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// Scan the stack.
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mov x0, sp
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bl tinygo_scanstack
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// Restore stack state and return.
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ldp x29, x30, [sp], #96
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ret
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