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[Backtracing] Add ImageMap instead of just using an Array.

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We want to be able to efficiently serialise lists of images, and to do so
it makes most sense to create a separate `ImageMap` type.  This also provides
a useful place to put methods to e.g. find an image by address or by build
ID.

rdar://124913332
This commit is contained in:
Alastair Houghton
2024-11-15 12:36:38 +00:00
parent 760cc57bef
commit 0e3e9efcd3
16 changed files with 1501 additions and 224 deletions
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10
stdlib/public/RuntimeModule/FramePointerUnwinder.swift
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@@ -30,7 +30,7 @@ public struct FramePointerUnwinder<C: Context, M: MemoryReader>: Sequence, Itera
var done: Bool
#if os(Linux)
var images: [Backtrace.Image]?
var images: ImageMap?
#endif
var reader: MemoryReader
@@ -41,7 +41,7 @@ public struct FramePointerUnwinder<C: Context, M: MemoryReader>: Sequence, Itera
@_specialize(exported: true, kind: full, where C == HostContext, M == MemserverMemoryReader)
#endif
public init(context: Context,
images: [Backtrace.Image]?,
images: ImageMap?,
memoryReader: MemoryReader) {
pc = Address(context.programCounter)
@@ -87,10 +87,7 @@ public struct FramePointerUnwinder<C: Context, M: MemoryReader>: Sequence, Itera
let address = MemoryReader.Address(pc)
if let images = images,
let imageNdx = images.firstIndex(
where: { address >= MemoryReader.Address($0.baseAddress)!
&& address < MemoryReader.Address($0.endOfText)! }
) {
let imageNdx = images.indexOfImage(at: Backtrace.Address(address)) {
let base = MemoryReader.Address(images[imageNdx].baseAddress)!
let relativeAddress = address - base
let cache = ElfImageCache.threadLocal
@@ -259,7 +256,6 @@ public struct FramePointerUnwinder<C: Context, M: MemoryReader>: Sequence, Itera
#endif
asyncContext = next
return .asyncResumePoint(pc)
}
}