[Backtracing] Fix a symbol lookup bug.

al45tair · al45tair · commit 7fcd48aca244 · 2023-06-02T17:47:29.000+01:00
We sometimes picked the wrong symbol because of this.
diff --git a/stdlib/public/Backtracing/Elf.swift b/stdlib/public/Backtracing/Elf.swift
@@ -964,7 +964,7 @@ struct ElfSymbolTable<SomeElfTraits: ElfTraits>: ElfSymbolTableProtocol {
         nextValue = _symbols[mid + 1].value
       }
 
-      if symbol.value <= address && nextValue >= address {
+      if symbol.value <= address && nextValue > address {
         var ndx = mid
         while ndx > 0 && _symbols[ndx - 1].value == address {
           ndx -= 1

Original file line number	Diff line number	Diff line change
`@@ -964,7 +964,7 @@ struct ElfSymbolTable<SomeElfTraits: ElfTraits>: ElfSymbolTableProtocol {`
`964`	`964`	`nextValue = _symbols[mid + 1].value`
`965`	`965`	`}`
`966`	`966`
`967`		`- if symbol.value <= address && nextValue >= address {`
	`967`	`+ if symbol.value <= address && nextValue > address {`
`968`	`968`	`var ndx = mid`
`969`	`969`	`while ndx > 0 && _symbols[ndx - 1].value == address {`
`970`	`970`	`ndx -= 1`