diff --git a/src/construct.jl b/src/construct.jl
index 4615054d..71352f8e 100644
--- a/src/construct.jl
+++ b/src/construct.jl
@@ -172,7 +172,7 @@ function prepare_framecode(method::Method, @nospecialize(argtypes); enter_genera
         if (!isempty(lenv) && (hasarg(isidentical(:llvmcall), code.code) ||
                                hasarg(isidentical(Base.llvmcall), code.code) ||
                                hasarg(a->is_global_ref(a, Base, :llvmcall), code.code))) ||
-                hasarg(isidentical(:iolock_begin), code.code)
+                               hasarg(isidentical(:iolock_begin), code.code)
             return Compiled()
         end
         framecode = FrameCode(method, code; generator=generator)
diff --git a/src/interpret.jl b/src/interpret.jl
index e3613bf5..4196e517 100644
--- a/src/interpret.jl
+++ b/src/interpret.jl
@@ -460,14 +460,25 @@ function coverage_visit_line!(frame::Frame)
     pc, code = frame.pc, frame.framecode
     code.report_coverage || return
     src = code.src
+    @static if VERSION ≥ v"1.12.0-DEV.173"
+    lineinfo = linetable(src.debuginfo, pc)
+    file, line = lineinfo.file, lineinfo.line
+    if line != frame.last_codeloc
+        file isa Symbol || (file = Symbol(file)::Symbol)
+        @ccall jl_coverage_visit_line(file::Cstring, sizeof(file)::Csize_t, line::Cint)::Cvoid
+        frame.last_codeloc = codeloc
+    end
+    else # VERSION < v"1.12.0-DEV.173"
     codeloc = src.codelocs[pc]
     if codeloc != frame.last_codeloc && codeloc != 0
         linetable = src.linetable::Vector{Any}
         lineinfo = linetable[codeloc]::Core.LineInfoNode
-        file, line = String(lineinfo.file), lineinfo.line
-        ccall(:jl_coverage_visit_line, Cvoid, (Cstring, Csize_t, Cint), file, sizeof(file), line)
+        file, line = lineinfo.file, lineinfo.line
+        file isa Symbol || (file = Symbol(file)::Symbol)
+        @ccall jl_coverage_visit_line(file::Cstring, sizeof(file)::Csize_t, line::Cint)::Cvoid
         frame.last_codeloc = codeloc
     end
+    end # @static if
 end
 
 # For "profiling" where JuliaInterpreter spends its time. See the commented-out block
diff --git a/src/types.jl b/src/types.jl
index 04539fa9..041a5b84 100644
--- a/src/types.jl
+++ b/src/types.jl
@@ -147,9 +147,24 @@ function FrameCode(scope, src::CodeInfo; generator=false, optimize=true)
 
     lt = linetable(src)
     unique_files = Set{Symbol}()
+    @static if VERSION ≥ v"1.12.0-DEV.173"
+    function pushuniquefiles!(unique_files::Set{Symbol}, lt)
+        for edge in lt.edges
+            pushuniquefiles!(unique_files, edge)
+        end
+        linetable = lt.linetable
+        if linetable === nothing
+            push!(unique_files, Base.IRShow.debuginfo_file1(lt))
+        else
+            pushuniquefiles!(unique_files, linetable)
+        end
+    end
+    pushuniquefiles!(unique_files, lt)
+    else # VERSION < v"1.12.0-DEV.173"
     for entry in lt
         push!(unique_files, entry.file)
     end
+    end # @static if
 
     framecode = FrameCode(scope, src, methodtables, breakpoints, slotnamelists, used, generator, report_coverage, unique_files)
     if scope isa Method
@@ -237,7 +252,7 @@ mutable struct Frame
     assignment_counter::Int64
     caller::Union{Frame,Nothing}
     callee::Union{Frame,Nothing}
-    last_codeloc::Int32
+    last_codeloc::Int
 end
 function Frame(framecode::FrameCode, framedata::FrameData, pc=1, caller=nothing)
     if length(junk_frames) > 0
diff --git a/src/utils.jl b/src/utils.jl
index 7923d5f8..8f4b14ad 100644
--- a/src/utils.jl
+++ b/src/utils.jl
@@ -258,7 +258,11 @@ end
 
 # These getters improve inference since fieldtype(CodeInfo, :linetable)
 # and fieldtype(CodeInfo, :codelocs) are both Any
-const LineTypes = Union{LineNumberNode,Core.LineInfoNode}
+@static if VERSION ≥ v"1.12.0-DEV.173"
+    const LineTypes = Union{LineNumberNode,Base.IRShow.LineInfoNode}
+else
+    const LineTypes = Union{LineNumberNode,Core.LineInfoNode}
+end
 function linetable(arg)
     if isa(arg, Frame)
         arg = arg.framecode
@@ -266,30 +270,74 @@ function linetable(arg)
     if isa(arg, FrameCode)
         arg = arg.src
     end
-    return (arg::CodeInfo).linetable::Union{Vector{Core.LineInfoNode},Vector{Any}}  # issue #264
+    ci = arg::CodeInfo
+    @static if VERSION ≥ v"1.12.0-DEV.173"
+    return ci.debuginfo
+    else # VERSION < v"1.12.0-DEV.173"
+    return ci.linetable::Union{Vector{Core.LineInfoNode},Vector{Any}} # issue #264
+    end # @static if
 end
-_linetable(list::Vector, i::Integer) = list[i]::Union{Expr,LineTypes}
 function linetable(arg, i::Integer; macro_caller::Bool=false)::Union{Expr,LineTypes}
     lt = linetable(arg)
-    lineinfo = _linetable(lt, i)
+    @static if VERSION ≥ v"1.12.0-DEV.173"
+    # TODO: decode the linetable at this frame efficiently by reimplementing this here
+    # TODO: get the contextual name from the parent, rather than returning "n/a" (which breaks Cthulhu)
+    return Base.IRShow.buildLineInfoNode(lt, :var"n/a", i)[1] # ignore all inlining / macro expansion / etc :(
+    else # VERSION < v"1.12.0-DEV.173"
+    lin = lt[i]::Union{Expr,LineTypes}
     if macro_caller
-        while lineinfo isa Core.LineInfoNode && lineinfo.method === Symbol("macro expansion") && lineinfo.inlined_at != 0
-            lineinfo = _linetable(lt, lineinfo.inlined_at)
+        while lin isa Core.LineInfoNode && lin.method === Symbol("macro expansion") && lin.inlined_at != 0
+            lin = lt[lin.inlined_at]::Union{Expr,LineTypes}
         end
     end
-    return lineinfo
+    return lin
+    end # @static if
 end
 
-function codelocs(arg)
+@static if VERSION ≥ v"1.12.0-DEV.173"
+
+function getlastline(arg)
+    debuginfo = linetable(arg)
+    while true
+        ltnext = debuginfo.linetable
+        ltnext === nothing && break
+        debuginfo = ltnext
+    end
+    lastline = 0
+    for k = 0:typemax(Int)
+        codeloc = Core.Compiler.getdebugidx(debuginfo, k)
+        line::Int = codeloc[1]
+        line < 0 && break
+        lastline = max(lastline, line)
+    end
+    return lastline
+end
+function codelocs(arg, i::Integer)
+    lt = linetable(arg)
+    codeloc = Base.IRShow.getdebugidx(lt, i)
+    line::Int = codeloc[1]
+    line < 0 && return 0 # broken or disabled debug info?
+    if line == 0 && codeloc[2] == 0
+        return 0 # no line number update
+    end
+    return Int(i)
+end
+
+else # VERSION < v"1.12.0-DEV.173"
+
+getlastline(arg) = getline(linetable(arg)[end])
+function codelocs(arg, i::Integer)
     if isa(arg, Frame)
         arg = arg.framecode
     end
     if isa(arg, FrameCode)
         arg = arg.src
     end
-    return (arg::CodeInfo).codelocs::Vector{Int32}
+    ci = arg::CodeInfo
+    return ci.codelocs[i]
 end
-codelocs(arg, i::Integer) = codelocs(arg)[i]  # for consistency with linetable (but no extra benefit here)
+
+end # @static if
 
 function lineoffset(framecode::FrameCode)
     offset = 0
@@ -367,7 +415,7 @@ function codelocation(code::CodeInfo, idx::Int)
     idx′ = idx
     # look ahead if we are on a meta line
     while idx′ < length(code.code)
-        codeloc = codelocs(code)[idx′]
+        codeloc = codelocs(code, idx′)
         codeloc == 0 || return codeloc
         ex = code.code[idx′]
         ex === nothing || isexpr(ex, :meta) || break
@@ -377,7 +425,7 @@ function codelocation(code::CodeInfo, idx::Int)
     # if zero, look behind until we find where we last might have had a line
     while idx′ > 0
         ex = code.code[idx′]
-        codeloc = codelocs(code)[idx′]
+        codeloc = codelocs(code, idx′)
         codeloc == 0 || return codeloc
         idx′ -= 1
     end
@@ -390,8 +438,8 @@ function compute_corrected_linerange(method::Method)
     offset = line1 - method.line
     @assert !is_generated(method)
     src = JuliaInterpreter.get_source(method)
-    lastline = linetable(src)[end]::LineTypes
-    return line1:getline(lastline) + offset
+    lastline = getlastline(src)
+    return line1:lastline + offset
 end
 
 function compute_linerange(framecode)
@@ -506,9 +554,7 @@ breakpointchar(framecode, stmtidx) =
 function print_framecode(io::IO, framecode::FrameCode; pc=0, range=1:nstatements(framecode), kwargs...)
     iscolor = get(io, :color, false)
     ndstmt = ndigits(nstatements(framecode))
-    lt = linetable(framecode)
-    offset = lineoffset(framecode)
-    ndline = isempty(lt) ? 0 : ndigits(getline(lt[end]) + offset)
+    ndline = ndigits(getlastline(linetable(framecode)) + lineoffset(framecode))
     nullline = " "^ndline
     src = copy(framecode.src)
     replace_coretypes!(src; rev=true)
diff --git a/test/utils.jl b/test/utils.jl
index 1a3f058e..f1cf69a7 100644
--- a/test/utils.jl
+++ b/test/utils.jl
@@ -36,8 +36,7 @@ struct Aborted    # for signaling that some statement or test blocks were interr
 end
 
 function Aborted(frame::Frame, pc)
-    src = frame.framecode.src
-    lineidx = src.codelocs[pc]
+    lineidx = JuliaInterpreter.codelocs(frame, pc)
     lineinfo = JuliaInterpreter.linetable(frame, lineidx; macro_caller=true)
     return Aborted(lineinfo)
 end