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ae060fe849
Since the Go runtime treats it specially, so must the pointer analysis.
Details:
- Combine object.{val,typ} fields into 'data interface{}'.
It may now hold a string, describing an instrinsically
allocated object such as the command-line args.
- extend Label accordingly; add Label.ReflectType() accessor.
Also: document pointer analysis algorithm classification.
R=crawshaw
CC=golang-dev
https://golang.org/cl/14156043
39 lines
1.4 KiB
Plaintext
39 lines
1.4 KiB
Plaintext
-*- text -*-
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Pointer analysis to-do list
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===========================
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CONSTRAINT GENERATION:
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- support reflection
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- implement native intrinsics. These vary by platform.
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- unsafe.Pointer conversions. Three options:
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1) unsoundly (but type-safely) treat p=unsafe.Pointer(x) conversions as
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allocations, losing aliases. This is what's currently implemented.
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2) unsoundly (but type-safely) treat p=unsafe.Pointer(x) and T(p)
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conversions as interface boxing and unboxing operations.
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This may preserve some aliasing relations at little cost.
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3) soundly track physical field offsets. (Summarise dannyb's email here.)
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A downside is that we can't keep the identity field of struct
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allocations that identifies the object.
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OPTIMISATIONS
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- pre-solver: PE and LE via HVN/HRU.
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- solver: HCD, LCD.
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- use sparse bitvectors for ptsets
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- use sparse bitvectors for graph edges
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- experiment with different worklist algorithms:
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priority queue (solver visit-time order)
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red-black tree (node id order)
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double-ended queue (insertion order)
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fast doubly-linked list (See Zhanh et al PLDI'13)
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(insertion order with fast membership test)
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dannyb recommends sparse bitmap.
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API:
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- Some optimisations (e.g. LE, PE) may change the API.
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Think about them sooner rather than later.
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MISC:
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- Test on all platforms.
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Currently we assume these go/build tags: linux, amd64, !cgo.
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