Merge branch 'main' into users/mingmingl-llvm/samplefdo-profile-formatusers/mingmingl-llvm/samplefdo-profile-format

51 files changed, 686 insertions, 175 deletions

diff --git a/cross-project-tests/debuginfo-tests/dexter-tests/aggregate-indirect-arg.cpp b/cross-project-tests/debuginfo-tests/dexter-tests/aggregate-indirect-arg.cpp
index f20b7ce1d3e4..4e06ba5d375c 100644
--- a/cross-project-tests/debuginfo-tests/dexter-tests/aggregate-indirect-arg.cpp
+++ b/cross-project-tests/debuginfo-tests/dexter-tests/aggregate-indirect-arg.cpp
@@ -3,7 +3,7 @@
 //
 // RUN: %clang++ -std=gnu++11 -O0 -g %s -o %t
 // RUN: %dexter --fail-lt 1.0 -w \
-// RUN:     --binary %t --debugger 'lldb' -- %s
+// RUN:     --binary %t %dexter_lldb_args -- %s
 // Radar 8945514
 
 class SVal {
diff --git a/cross-project-tests/debuginfo-tests/dexter-tests/asan-deque.cpp b/cross-project-tests/debuginfo-tests/dexter-tests/asan-deque.cpp
index 08540145dc4e..d807fa190608 100644
--- a/cross-project-tests/debuginfo-tests/dexter-tests/asan-deque.cpp
+++ b/cross-project-tests/debuginfo-tests/dexter-tests/asan-deque.cpp
@@ -10,7 +10,7 @@
 
 // RUN: %clang++ -std=gnu++11 -O1 -glldb -fsanitize=address -arch x86_64 %s -o %t
 // RUN: %dexter --fail-lt 1.0 -w \
-// RUN:     --binary %t --debugger 'lldb' -- %s
+// RUN:     --binary %t %dexter_lldb_args -- %s
 #include <deque>
 
 struct A {
diff --git a/cross-project-tests/debuginfo-tests/dexter-tests/asan.c b/cross-project-tests/debuginfo-tests/dexter-tests/asan.c
index e52494c585d8..9105e1d8801b 100644
--- a/cross-project-tests/debuginfo-tests/dexter-tests/asan.c
+++ b/cross-project-tests/debuginfo-tests/dexter-tests/asan.c
@@ -6,7 +6,7 @@
 // RUN: %clang -std=gnu11 --driver-mode=gcc -O0 -glldb -fblocks -arch x86_64 \
 // RUN:     -fsanitize=address %s -o %t
 // RUN: %dexter --fail-lt 1.0 -w \
-// RUN:     --binary %t --debugger 'lldb' -- %s
+// RUN:     --binary %t %dexter_lldb_args -- %s
 
 struct S {
   int a[8];
diff --git a/cross-project-tests/debuginfo-tests/dexter-tests/ctor.cpp b/cross-project-tests/debuginfo-tests/dexter-tests/ctor.cpp
index 48482ceb31b9..6b6dc3ef309b 100644
--- a/cross-project-tests/debuginfo-tests/dexter-tests/ctor.cpp
+++ b/cross-project-tests/debuginfo-tests/dexter-tests/ctor.cpp
@@ -3,7 +3,7 @@
 //
 // RUN: %clang++ -std=gnu++11 -O0 -glldb %s -o %t
 // RUN: %dexter --fail-lt 1.0 -w \
-// RUN:     --binary %t --debugger 'lldb' -- %s
+// RUN:     --binary %t %dexter_lldb_args -- %s
 
 class A {
 public:
diff --git a/cross-project-tests/debuginfo-tests/dexter-tests/dbg-arg.c b/cross-project-tests/debuginfo-tests/dexter-tests/dbg-arg.c
index ff000f584db0..f1f145c7ff38 100644
--- a/cross-project-tests/debuginfo-tests/dexter-tests/dbg-arg.c
+++ b/cross-project-tests/debuginfo-tests/dexter-tests/dbg-arg.c
@@ -4,7 +4,7 @@
 // This test case checks debug info during register moves for an argument.
 // RUN: %clang -std=gnu11 -m64 -mllvm -fast-isel=false -g %s -o %t
 // RUN: %dexter --fail-lt 1.0 -w \
-// RUN:     --binary %t --debugger 'lldb' -- %s
+// RUN:     --binary %t %dexter_lldb_args -- %s
 //
 // Radar 8412415
 
diff --git a/cross-project-tests/debuginfo-tests/dexter-tests/deferred_globals.cpp b/cross-project-tests/debuginfo-tests/dexter-tests/deferred_globals.cpp
index 5954f5297be0..570708d4fa91 100644
--- a/cross-project-tests/debuginfo-tests/dexter-tests/deferred_globals.cpp
+++ b/cross-project-tests/debuginfo-tests/dexter-tests/deferred_globals.cpp
@@ -6,7 +6,7 @@
 // UNSUPPORTED: system-windows
 // RUN: %clang++ -std=gnu++11 -O0 -g %s -o %t
 // RUN: %dexter --fail-lt 1.0 -w \
-// RUN:     --binary  %t --debugger 'lldb' -v -- %s
+// RUN:     --binary  %t %dexter_lldb_args -v -- %s
 
 const int d = 100;
 
diff --git a/cross-project-tests/debuginfo-tests/dexter-tests/memvars/bitcast.c b/cross-project-tests/debuginfo-tests/dexter-tests/memvars/bitcast.c
index 314fd3b31c42..69e3b8035511 100644
--- a/cross-project-tests/debuginfo-tests/dexter-tests/memvars/bitcast.c
+++ b/cross-project-tests/debuginfo-tests/dexter-tests/memvars/bitcast.c
@@ -4,7 +4,7 @@
 // REQUIRES: lldb
 // UNSUPPORTED: system-windows
 // RUN: %clang -std=gnu11 -O3 -glldb %s -o %t
-// RUN: %dexter --fail-lt 1.0 -w --debugger lldb --binary %t -- %s
+// RUN: %dexter --fail-lt 1.0 -w %dexter_lldb_args --binary %t -- %s
 
 //// Adapted from https://bugs.llvm.org/show_bug.cgi?id=34136#c1
 //// LowerDbgDeclare has since been updated to look through bitcasts. We still
diff --git a/cross-project-tests/debuginfo-tests/dexter-tests/memvars/const-branch.c b/cross-project-tests/debuginfo-tests/dexter-tests/memvars/const-branch.c
index 42629c556ffa..c67dd0a3747b 100644
--- a/cross-project-tests/debuginfo-tests/dexter-tests/memvars/const-branch.c
+++ b/cross-project-tests/debuginfo-tests/dexter-tests/memvars/const-branch.c
@@ -4,7 +4,7 @@
 // REQUIRES: lldb
 // UNSUPPORTED: system-windows
 // RUN: %clang -std=gnu11 -O3 -glldb %s -o %t
-// RUN: %dexter --fail-lt 1.0 -w --debugger lldb --binary %t -- %s
+// RUN: %dexter --fail-lt 1.0 -w %dexter_lldb_args --binary %t -- %s
 
 //// Adapted from https://bugs.llvm.org/show_bug.cgi?id=34136#c4
 
diff --git a/cross-project-tests/debuginfo-tests/dexter-tests/memvars/ctrl-flow.c b/cross-project-tests/debuginfo-tests/dexter-tests/memvars/ctrl-flow.c
index 16ad91ec8ca0..4fa4e6e0120d 100644
--- a/cross-project-tests/debuginfo-tests/dexter-tests/memvars/ctrl-flow.c
+++ b/cross-project-tests/debuginfo-tests/dexter-tests/memvars/ctrl-flow.c
@@ -1,7 +1,7 @@
 // REQUIRES: lldb
 // UNSUPPORTED: system-windows
 // RUN: %clang -std=gnu11 -O2 -glldb %s -o %t
-// RUN: %dexter --fail-lt 1.0 -w --debugger lldb --binary %t -- %s
+// RUN: %dexter --fail-lt 1.0 -w %dexter_lldb_args --binary %t -- %s
 
 //// Check that we give good locations to a variable ('local') which is escaped
 //// down some control paths and not others. This example is handled well currently.
diff --git a/cross-project-tests/debuginfo-tests/dexter-tests/memvars/implicit-ptr.c b/cross-project-tests/debuginfo-tests/dexter-tests/memvars/implicit-ptr.c
index c43b99241445..5c11fe426d91 100644
--- a/cross-project-tests/debuginfo-tests/dexter-tests/memvars/implicit-ptr.c
+++ b/cross-project-tests/debuginfo-tests/dexter-tests/memvars/implicit-ptr.c
@@ -4,7 +4,7 @@
 // REQUIRES: lldb
 // UNSUPPORTED: system-windows
 // RUN: %clang -std=gnu11 -O3 -glldb %s -o %t
-// RUN: %dexter --fail-lt 1.0 -w --debugger lldb --binary %t -- %s
+// RUN: %dexter --fail-lt 1.0 -w %dexter_lldb_args --binary %t -- %s
 
 //// Check that 'param' in 'fun' can be read throughout, and that 'pa' and 'pb'
 //// can be dereferenced in the debugger even if we can't provide the pointer
diff --git a/cross-project-tests/debuginfo-tests/dexter-tests/memvars/inline-escaping-function.c b/cross-project-tests/debuginfo-tests/dexter-tests/memvars/inline-escaping-function.c
index 3c03603736f7..541f003c2615 100644
--- a/cross-project-tests/debuginfo-tests/dexter-tests/memvars/inline-escaping-function.c
+++ b/cross-project-tests/debuginfo-tests/dexter-tests/memvars/inline-escaping-function.c
@@ -4,7 +4,7 @@
 // REQUIRES: lldb
 // UNSUPPORTED: system-windows
 // RUN: %clang -std=gnu11 -O3 -glldb %s -o %t
-// RUN: %dexter --fail-lt 1.0 -w --debugger lldb --binary %t -- %s
+// RUN: %dexter --fail-lt 1.0 -w %dexter_lldb_args --binary %t -- %s
 
 // 1. param is escaped by inlineme(&param) so it is not promoted by
 //    SROA/mem2reg.
diff --git a/cross-project-tests/debuginfo-tests/dexter-tests/memvars/inlining-dse.c b/cross-project-tests/debuginfo-tests/dexter-tests/memvars/inlining-dse.c
index d5bdc3e01fa1..cded557f4e16 100644
--- a/cross-project-tests/debuginfo-tests/dexter-tests/memvars/inlining-dse.c
+++ b/cross-project-tests/debuginfo-tests/dexter-tests/memvars/inlining-dse.c
@@ -4,7 +4,7 @@
 // REQUIRES: lldb
 // UNSUPPORTED: system-windows
 // RUN: %clang -std=gnu11 -O2 -glldb %s -o %t
-// RUN: %dexter --fail-lt 1.0 -w --debugger lldb --binary %t -- %s
+// RUN: %dexter --fail-lt 1.0 -w %dexter_lldb_args --binary %t -- %s
 //
 //// Check that once-escaped variable 'param' can still be read after we
 //// perform inlining + mem2reg, and that we see the DSE'd value 255.
diff --git a/cross-project-tests/debuginfo-tests/dexter-tests/memvars/inlining.c b/cross-project-tests/debuginfo-tests/dexter-tests/memvars/inlining.c
index dd7b3452f2b0..7d02b2d4bc8c 100644
--- a/cross-project-tests/debuginfo-tests/dexter-tests/memvars/inlining.c
+++ b/cross-project-tests/debuginfo-tests/dexter-tests/memvars/inlining.c
@@ -1,7 +1,7 @@
 // REQUIRES: lldb
 // UNSUPPORTED: system-windows
 // RUN: %clang -std=gnu11 -O2 -glldb %s -o %t
-// RUN: %dexter --fail-lt 1.0 -w --debugger lldb --binary %t -- %s
+// RUN: %dexter --fail-lt 1.0 -w %dexter_lldb_args --binary %t -- %s
 //
 //// Check that the once-escaped variable 'param' can still be read after
 //// we perform inlining + mem2reg. See D89810 and D85555.
diff --git a/cross-project-tests/debuginfo-tests/dexter-tests/memvars/loop.c b/cross-project-tests/debuginfo-tests/dexter-tests/memvars/loop.c
index 8ce358b4aada..d74432579c3b 100644
--- a/cross-project-tests/debuginfo-tests/dexter-tests/memvars/loop.c
+++ b/cross-project-tests/debuginfo-tests/dexter-tests/memvars/loop.c
@@ -4,7 +4,7 @@
 // REQUIRES: lldb
 // UNSUPPORTED: system-windows
 // RUN: %clang -std=gnu11 -O3 -glldb %s -o %t
-// RUN: %dexter --fail-lt 1.0 -w --debugger lldb --binary %t -- %s
+// RUN: %dexter --fail-lt 1.0 -w %dexter_lldb_args --binary %t -- %s
 
 //// Check that escaped local 'param' in function 'fun' has sensible debug info
 //// after the escaping function 'use' gets arg promotion (int* -> int). Currently
diff --git a/cross-project-tests/debuginfo-tests/dexter-tests/memvars/merged-store.c b/cross-project-tests/debuginfo-tests/dexter-tests/memvars/merged-store.c
index bbd806a08819..492e42dfce0b 100644
--- a/cross-project-tests/debuginfo-tests/dexter-tests/memvars/merged-store.c
+++ b/cross-project-tests/debuginfo-tests/dexter-tests/memvars/merged-store.c
@@ -4,7 +4,7 @@
 // REQUIRES: lldb
 // UNSUPPORTED: system-windows
 // RUN: %clang -std=gnu11 -O3 -glldb %s -o %t
-// RUN: %dexter --fail-lt 1.0 -w --debugger lldb --binary %t -- %s
+// RUN: %dexter --fail-lt 1.0 -w %dexter_lldb_args --binary %t -- %s
 
 // 1. parama is escaped by esc(&parama) so it is not promoted by
 //    SROA/mem2reg.
diff --git a/cross-project-tests/debuginfo-tests/dexter-tests/memvars/ptr-to.c b/cross-project-tests/debuginfo-tests/dexter-tests/memvars/ptr-to.c
index 26adc2e4d978..632b499eebd1 100644
--- a/cross-project-tests/debuginfo-tests/dexter-tests/memvars/ptr-to.c
+++ b/cross-project-tests/debuginfo-tests/dexter-tests/memvars/ptr-to.c
@@ -5,7 +5,7 @@
 // REQUIRES: lldb
 // UNSUPPORTED: system-windows
 // RUN: %clang -std=gnu11 -O2 -glldb %s -o %t
-// RUN: %dexter --fail-lt 1.0 -w --debugger lldb --binary %t -- %s
+// RUN: %dexter --fail-lt 1.0 -w %dexter_lldb_args --binary %t -- %s
 //
 //// Check that a pointer to a variable living on the stack dereferences to the
 //// variable value.
diff --git a/cross-project-tests/debuginfo-tests/dexter-tests/memvars/struct-dse.c b/cross-project-tests/debuginfo-tests/dexter-tests/memvars/struct-dse.c
index 2975b88e8bc6..5a36bbe59873 100644
--- a/cross-project-tests/debuginfo-tests/dexter-tests/memvars/struct-dse.c
+++ b/cross-project-tests/debuginfo-tests/dexter-tests/memvars/struct-dse.c
@@ -5,7 +5,7 @@
 // REQUIRES: lldb
 // UNSUPPORTED: system-windows
 // RUN: %clang -std=gnu11 -O2 -glldb %s -o %t
-// RUN: %dexter --fail-lt 1.0 -w --debugger lldb --binary %t -- %s
+// RUN: %dexter --fail-lt 1.0 -w %dexter_lldb_args --binary %t -- %s
 //
 //// Check debug-info for the escaped struct variable num is reasonable.
 
diff --git a/cross-project-tests/debuginfo-tests/dexter-tests/memvars/unused-merged-value.c b/cross-project-tests/debuginfo-tests/dexter-tests/memvars/unused-merged-value.c
index 38a9b644be50..2cf3e968ca75 100644
--- a/cross-project-tests/debuginfo-tests/dexter-tests/memvars/unused-merged-value.c
+++ b/cross-project-tests/debuginfo-tests/dexter-tests/memvars/unused-merged-value.c
@@ -6,7 +6,7 @@
 // REQUIRES: lldb
 // UNSUPPORTED: system-windows
 // RUN: %clang -std=gnu11 -O3 -glldb %s -o %t
-// RUN: %dexter --fail-lt 0.1 -w --debugger lldb --binary %t -- %s
+// RUN: %dexter --fail-lt 0.1 -w %dexter_lldb_args --binary %t -- %s
 // See NOTE at end for more info about the RUN command.
 
 // 1. SROA/mem2reg fully promotes parama.
diff --git a/cross-project-tests/debuginfo-tests/dexter-tests/namespace.cpp b/cross-project-tests/debuginfo-tests/dexter-tests/namespace.cpp
index e6709cc807db..ba910644de4e 100644
--- a/cross-project-tests/debuginfo-tests/dexter-tests/namespace.cpp
+++ b/cross-project-tests/debuginfo-tests/dexter-tests/namespace.cpp
@@ -7,7 +7,7 @@
 
 // RUN: %clang++ -g -O0 %s -o %t
 // RUN: %dexter --fail-lt 1.0 -w \
-// RUN:     --binary %t --debugger 'lldb' -v -- %s
+// RUN:     --binary %t %dexter_lldb_args -v -- %s
 
 #include <stdio.h>
 
diff --git a/cross-project-tests/debuginfo-tests/dexter-tests/nrvo-string.cpp b/cross-project-tests/debuginfo-tests/dexter-tests/nrvo-string.cpp
index 5df190a07a4e..42a7110151b2 100644
--- a/cross-project-tests/debuginfo-tests/dexter-tests/nrvo-string.cpp
+++ b/cross-project-tests/debuginfo-tests/dexter-tests/nrvo-string.cpp
@@ -9,11 +9,11 @@
 //
 // RUN: %clang++ -std=gnu++11 -O0 -glldb -fno-exceptions %s -o %t
 // RUN: %dexter --fail-lt 1.0 -w \
-// RUN:     --binary %t --debugger 'lldb' -- %s
+// RUN:     --binary %t %dexter_lldb_args -- %s
 //
 // RUN: %clang++ -std=gnu++11 -O1 -glldb -fno-exceptions %s -o %t
 // RUN: %dexter --fail-lt 1.0 -w \
-// RUN:     --binary %t --debugger 'lldb' -- %s
+// RUN:     --binary %t %dexter_lldb_args -- %s
 //
 // PR34513
 volatile int sideeffect = 0;
diff --git a/cross-project-tests/debuginfo-tests/dexter-tests/optnone-fastmath.cpp b/cross-project-tests/debuginfo-tests/dexter-tests/optnone-fastmath.cpp
index 6053488dc680..3f21a8711b3d 100644
--- a/cross-project-tests/debuginfo-tests/dexter-tests/optnone-fastmath.cpp
+++ b/cross-project-tests/debuginfo-tests/dexter-tests/optnone-fastmath.cpp
@@ -1,9 +1,9 @@
 // RUN: %clang++ -std=gnu++11 -O2 -ffast-math -g %s -o %t
 // RUN: %dexter --fail-lt 1.0 -w \
-// RUN:     --binary %t --debugger 'lldb' -- %s
+// RUN:     --binary %t %dexter_lldb_args -- %s
 // RUN: %clang++ -std=gnu++11 -O0 -ffast-math -g %s -o %t
 // RUN: %dexter --fail-lt 1.0 -w \
-// RUN:     --binary %t --debugger 'lldb' -- %s
+// RUN:     --binary %t %dexter_lldb_args -- %s
 
 // REQUIRES: lldb
 // Currently getting intermittent failures on darwin.
diff --git a/cross-project-tests/debuginfo-tests/dexter-tests/optnone-loops.cpp b/cross-project-tests/debuginfo-tests/dexter-tests/optnone-loops.cpp
index 230998c6d4e0..f760b7afe6cb 100644
--- a/cross-project-tests/debuginfo-tests/dexter-tests/optnone-loops.cpp
+++ b/cross-project-tests/debuginfo-tests/dexter-tests/optnone-loops.cpp
@@ -7,7 +7,7 @@
 
 // RUN: %clang++ -std=gnu++11 -O2 -g %s -o %t
 // RUN: %dexter --fail-lt 1.0 -w \
-// RUN:     --binary %t --debugger 'lldb' -- %s
+// RUN:     --binary %t %dexter_lldb_args -- %s
 
 // A simple loop of assignments.
 // With optimization level > 0 the compiler reorders basic blocks
diff --git a/cross-project-tests/debuginfo-tests/dexter-tests/optnone-simple-functions.cpp b/cross-project-tests/debuginfo-tests/dexter-tests/optnone-simple-functions.cpp
index e585c20f4a01..cc693cc7c967 100644
--- a/cross-project-tests/debuginfo-tests/dexter-tests/optnone-simple-functions.cpp
+++ b/cross-project-tests/debuginfo-tests/dexter-tests/optnone-simple-functions.cpp
@@ -1,9 +1,9 @@
 // RUN: %clang++ -std=gnu++11 -O2 -g %s -o %t
 // RUN: %dexter --fail-lt 1.0 -w \
-// RUN:     --binary %t --debugger 'lldb' -- %s
+// RUN:     --binary %t %dexter_lldb_args -- %s
 // RUN: %clang++ -std=gnu++11 -O0 -g %s -o %t
 // RUN: %dexter --fail-lt 1.0 -w \
-// RUN:     --binary %t --debugger 'lldb' -- %s
+// RUN:     --binary %t %dexter_lldb_args -- %s
 
 // REQUIRES: lldb, D136396
 // Currently getting intermittent failures on darwin.
diff --git a/cross-project-tests/debuginfo-tests/dexter-tests/optnone-struct-and-methods.cpp b/cross-project-tests/debuginfo-tests/dexter-tests/optnone-struct-and-methods.cpp
index 6aebd502614f..94934356ac7e 100644
--- a/cross-project-tests/debuginfo-tests/dexter-tests/optnone-struct-and-methods.cpp
+++ b/cross-project-tests/debuginfo-tests/dexter-tests/optnone-struct-and-methods.cpp
@@ -1,9 +1,9 @@
 // RUN: %clang++ -std=gnu++11 -O2 -g %s -o %t
 // RUN: %dexter --fail-lt 1.0 -w \
-// RUN:     --binary %t --debugger 'lldb' -v -- %s
+// RUN:     --binary %t %dexter_lldb_args -v -- %s
 // RUN: %clang++ -std=gnu++11 -O0 -g %s -o %t
 // RUN: %dexter --fail-lt 1.0 -w \
-// RUN:     --binary %t --debugger 'lldb' -- %s
+// RUN:     --binary %t %dexter_lldb_args -- %s
 
 // REQUIRES: lldb
 // Currently getting intermittent failures on darwin.
diff --git a/cross-project-tests/debuginfo-tests/dexter-tests/optnone-vectors-and-functions.cpp b/cross-project-tests/debuginfo-tests/dexter-tests/optnone-vectors-and-functions.cpp
index 5c4cfc0b9c43..fd244fbafdb7 100644
--- a/cross-project-tests/debuginfo-tests/dexter-tests/optnone-vectors-and-functions.cpp
+++ b/cross-project-tests/debuginfo-tests/dexter-tests/optnone-vectors-and-functions.cpp
@@ -1,9 +1,9 @@
 // RUN: %clang++ -std=gnu++11 -O2 -g %s -o %t
 // RUN: %dexter --fail-lt 1.0 -w \
-// RUN:     --binary %t --debugger 'lldb' -v -- %s
+// RUN:     --binary %t %dexter_lldb_args -v -- %s
 // RUN: %clang++ -std=gnu++11 -O0 -g %s -o %t
 // RUN: %dexter --fail-lt 1.0 -w \
-// RUN:     --binary %t --debugger 'lldb' -- %s
+// RUN:     --binary %t %dexter_lldb_args -- %s
 
 // REQUIRES: lldb
 // Currently getting intermittent failures on darwin.
diff --git a/cross-project-tests/debuginfo-tests/dexter-tests/stack-var.c b/cross-project-tests/debuginfo-tests/dexter-tests/stack-var.c
index 7e3c4b5d0ce1..8447dd1cad29 100644
--- a/cross-project-tests/debuginfo-tests/dexter-tests/stack-var.c
+++ b/cross-project-tests/debuginfo-tests/dexter-tests/stack-var.c
@@ -2,7 +2,7 @@
 // UNSUPPORTED: system-windows
 //
 // RUN: %clang -std=gnu11 -O -glldb %s -o %t
-// RUN: %dexter --fail-lt 1.0 -w --binary %t --debugger 'lldb' -- %s
+// RUN: %dexter --fail-lt 1.0 -w --binary %t %dexter_lldb_args -- %s
 
 void __attribute__((noinline, optnone)) bar(int *test) {}
 int main() {
diff --git a/cross-project-tests/debuginfo-tests/dexter-tests/vla.c b/cross-project-tests/debuginfo-tests/dexter-tests/vla.c
index ff5297f890e7..6978b5b91fa3 100644
--- a/cross-project-tests/debuginfo-tests/dexter-tests/vla.c
+++ b/cross-project-tests/debuginfo-tests/dexter-tests/vla.c
@@ -3,7 +3,7 @@
 // UNSUPPORTED: system-windows
 //
 // RUN: %clang -std=gnu11 -O0 -glldb %s -o %t
-// RUN: %dexter --fail-lt 1.0 -w --binary %t --debugger 'lldb' -- %s
+// RUN: %dexter --fail-lt 1.0 -w --binary %t %dexter_lldb_args -- %s
 
 void init_vla(int size) {
   int i;
diff --git a/cross-project-tests/debuginfo-tests/dexter/Commands.md b/cross-project-tests/debuginfo-tests/dexter/Commands.md
index a98261a50009..afec3e6bbd00 100644
--- a/cross-project-tests/debuginfo-tests/dexter/Commands.md
+++ b/cross-project-tests/debuginfo-tests/dexter/Commands.md
@@ -13,7 +13,8 @@
 * [DexDeclareFile](Commands.md#DexDeclareFile)
 * [DexFinishTest](Commands.md#DexFinishTest)
 * [DexCommandLine](Commands.md#DexCommandLine)
-
+* [DexStepFunction](Commands.md#DexStepFunction)
+* [DexContinue](Commands.md#DexContinue)
 ---
 ## DexExpectProgramState
     DexExpectProgramState(state [,**times])
@@ -377,3 +378,44 @@ line this command is found on.
 
 ### Heuristic
 [Deprecated]
+
+
+---
+## DexStepFunction
+    DexStepFunction(function_name[, **hit_count=0])
+
+    Arg list:
+        function_name (str): function to step through.
+        hit_count (int): If provided, limit the number of times the command
+                         triggers.
+
+### Description
+NOTE: Only supported for DAP-based debuggers.
+
+This command controls stepping behaviour: Tell dexter to set a function
+breakpoint and step through the function after hitting it. Composes well with
+itself (you can may a callstack with multiple targets to step through) and
+`DexContinue`.
+
+---
+## DexContinue
+    DexContinue(*[expr, *values], **from_line[, **to_line, **hit_count])
+
+    Arg list:
+        function_name (str): function to step through.
+        hit_count (int): If provided, limit the number of times the command
+                         triggers.
+
+### Description
+NOTE: Only supported for DAP-based debuggers.
+
+This command controls stepping behaviour: Tell dexter to set a breakpoint on
+`from_line`. When it is hit and optionally '(expr) == (values[n])' is true,
+optionally set a breakpoint on `to_line`. Then 'continue' (tell the debugger to
+run freely until a breakpoint is hit). Composed with `DexStepFunction` this
+lets you avoid stepping over certain regions (many loop iterations, for
+example). Continue-ing off the end of a `DexStepFunction` is well defined;
+stepping will resume in `DexStepFunction` targets deeper in the callstack.
+
+FIXME: hit_count should probably be inverted, like `DexLimitSteps`, to trigger
+AFTER that many hits?
diff --git a/cross-project-tests/debuginfo-tests/dexter/dex/command/ParseCommand.py b/cross-project-tests/debuginfo-tests/dexter/dex/command/ParseCommand.py
index 4496fdf3cb0e..1a30e0e8f375 100644
--- a/cross-project-tests/debuginfo-tests/dexter/dex/command/ParseCommand.py
+++ b/cross-project-tests/debuginfo-tests/dexter/dex/command/ParseCommand.py
@@ -35,6 +35,8 @@ from dex.command.commands.DexLimitSteps import DexLimitSteps
 from dex.command.commands.DexFinishTest import DexFinishTest
 from dex.command.commands.DexUnreachable import DexUnreachable
 from dex.command.commands.DexWatch import DexWatch
+from dex.command.commands.DexStepFunction import DexStepFunction
+from dex.command.commands.DexContinue import DexContinue
 from dex.utils import Timer
 from dex.utils.Exceptions import CommandParseError, DebuggerException
 
@@ -59,6 +61,8 @@ def _get_valid_commands():
         DexFinishTest.get_name(): DexFinishTest,
         DexUnreachable.get_name(): DexUnreachable,
         DexWatch.get_name(): DexWatch,
+        DexStepFunction.get_name(): DexStepFunction,
+        DexContinue.get_name(): DexContinue,
     }
 
 
diff --git a/cross-project-tests/debuginfo-tests/dexter/dex/command/commands/DexContinue.py b/cross-project-tests/debuginfo-tests/dexter/dex/command/commands/DexContinue.py
new file mode 100644
index 000000000000..113f34bedd13
--- /dev/null
+++ b/cross-project-tests/debuginfo-tests/dexter/dex/command/commands/DexContinue.py
@@ -0,0 +1,55 @@
+# DExTer : Debugging Experience Tester
+# ~~~~~~   ~         ~~         ~   ~~
+#
+# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+# See https://llvm.org/LICENSE.txt for license information.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+"""A Command that tells dexter to set a breakpoint which, after hitting,
+signals that the debugger should 'continue' until another is hit. Continuing
+out of a function being stepped through with DexStepFunction is well defined:
+stepping will resume in other functions tracked further down the stacktrace.
+
+NOTE: Only supported for DAP-based debuggers.
+"""
+
+from dex.command.CommandBase import CommandBase
+
+
+class DexContinue(CommandBase):
+    def __init__(self, *args, **kwargs):
+        # DexContinue(*[expr, *values], **from_line[, **to_line, **hit_count])
+
+        # Optional positional args: expr, values.
+        if len(args) == 0:
+            self.expression = None
+            self.values = []
+        elif len(args) == 1:
+            raise TypeError("expected 0 or at least 2 positional arguments")
+        else:
+            self.expression = args[0]
+            self.values = [str(arg) for arg in args[1:]]
+
+        # Required keyword arg: from_line.
+        try:
+            self.from_line = kwargs.pop("from_line")
+        except:
+            raise TypeError("Missing from_line argument")
+
+        # Optional conditional args: to_line, hit_count.
+        self.to_line = kwargs.pop("to_line", None)
+        self.hit_count = kwargs.pop("hit_count", None)
+
+        if kwargs:
+            raise TypeError("unexpected named args: {}".format(", ".join(kwargs)))
+        super(DexContinue, self).__init__()
+
+    def eval(self):
+        raise NotImplementedError("DexContinue commands cannot be evaled.")
+
+    @staticmethod
+    def get_name():
+        return __class__.__name__
+
+    @staticmethod
+    def get_subcommands() -> dict:
+        return None
diff --git a/cross-project-tests/debuginfo-tests/dexter/dex/command/commands/DexStepFunction.py b/cross-project-tests/debuginfo-tests/dexter/dex/command/commands/DexStepFunction.py
new file mode 100644
index 000000000000..4b80de87a1bb
--- /dev/null
+++ b/cross-project-tests/debuginfo-tests/dexter/dex/command/commands/DexStepFunction.py
@@ -0,0 +1,38 @@
+# DExTer : Debugging Experience Tester
+# ~~~~~~   ~         ~~         ~   ~~
+#
+# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+# See https://llvm.org/LICENSE.txt for license information.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+"""A Command that tells dexter to set a function breakpoint and step through
+the function after hitting it.
+
+NOTE: Only supported for DAP-based debuggers.
+"""
+
+from dex.command.CommandBase import CommandBase
+
+
+class DexStepFunction(CommandBase):
+    def __init__(self, *args, **kwargs):
+        if len(args) < 1:
+            raise TypeError("expected 1 positional argument")
+        self.function = str(args[0])
+        self.hit_count = kwargs.pop("hit_count", None)
+        if kwargs:
+            raise TypeError(f"unexpected named args: {', '.join(kwargs)}")
+        super(DexStepFunction, self).__init__()
+
+    def eval(self):
+        raise NotImplementedError("DexStepFunction commands cannot be evaled.")
+
+    def get_function(self):
+        return self.function
+
+    @staticmethod
+    def get_name():
+        return __class__.__name__
+
+    @staticmethod
+    def get_subcommands() -> dict:
+        return None
diff --git a/cross-project-tests/debuginfo-tests/dexter/dex/debugger/DAP.py b/cross-project-tests/debuginfo-tests/dexter/dex/debugger/DAP.py
index 06515dd8e0b1..4e64f880487f 100644
--- a/cross-project-tests/debuginfo-tests/dexter/dex/debugger/DAP.py
+++ b/cross-project-tests/debuginfo-tests/dexter/dex/debugger/DAP.py
@@ -218,6 +218,10 @@ class DAP(DebuggerBase, metaclass=abc.ABCMeta):
         self.file_to_bp = defaultdict(list)
         # { dex_breakpoint_id -> (file, line, condition) }
         self.bp_info = {}
+        # { dex_breakpoint_id -> function_name }
+        self.function_bp_info = {}
+        # { dex_breakpoint_id -> instruction_reference }
+        self.instruction_bp_info = {}
         # We don't rely on IDs returned directly from the debug adapter. Instead, we use dexter breakpoint IDs, and
         # maintain a two-way-mapping of dex_bp_id<->dap_bp_id. This also allows us to defer the setting of breakpoints
         # in the debug adapter itself until necessary.
@@ -226,6 +230,8 @@ class DAP(DebuggerBase, metaclass=abc.ABCMeta):
         self.dex_id_to_dap_id = {}
         self.dap_id_to_dex_ids = {}
         self.pending_breakpoints: bool = False
+        self.pending_function_breakpoints: bool = False
+        self.pending_instruction_breakpoints: bool = False
         # List of breakpoints, indexed by BP ID
         # Each entry has the source file (for use in referencing desired_bps), and the DA-assigned
         # ID for that breakpoint if it has one (if it has been removed or not yet created then it will be None).
@@ -288,6 +294,26 @@ class DAP(DebuggerBase, metaclass=abc.ABCMeta):
             {"source": {"path": source}, "breakpoints": [bp.toDict() for bp in bps]},
         )
 
+    @staticmethod
+    def make_set_function_breakpoint_request(function_names: list) -> dict:
+        # Function breakpoints may specify conditions and hit counts, though we
+        # don't use those here (though perhaps we should use native hit count,
+        # rather than emulating it ConditionalController, now that we have a
+        # shared interface (DAP)).
+        return DAP.make_request(
+            "setFunctionBreakpoints",
+            {"breakpoints": [{"name": f} for f in function_names]},
+        )
+
+    @staticmethod
+    def make_set_instruction_breakpoint_request(addrs: list) -> dict:
+        # Instruction breakpoints have additional fields we're ignoring for the
+        # moment.
+        return DAP.make_request(
+            "setInstructionBreakpoints",
+            {"breakpoints": [{"instructionReference": a} for a in addrs]},
+        )
+
     ############################################################################
     ## DAP communication & state-handling functions
 
@@ -355,8 +381,6 @@ class DAP(DebuggerBase, metaclass=abc.ABCMeta):
             else:
                 pass
         elif message["type"] == "response":
-            request_seq = message["request_seq"]
-            debugger_state.set_response(request_seq, message)
             # TODO: We also receive a "continued" event, but it seems reasonable to set state based on either the
             # response or the event, since the DAP does not specify an order in which they are sent. May need revisiting
             # if there turns out to be some odd ordering issues, e.g. if we can receive messages in the order
@@ -383,6 +407,10 @@ class DAP(DebuggerBase, metaclass=abc.ABCMeta):
                 body = message.get("body")
                 if body:
                     debugger_state.capabilities.update(logger, body)
+            # Now we've done whatever we need to do with the response, tell the
+            # receiver thread we've got it.
+            request_seq = message["request_seq"]
+            debugger_state.set_response(request_seq, message)
 
     def _colorize_dap_message(message: dict) -> dict:
         colorized_message = copy.deepcopy(message)
@@ -569,6 +597,22 @@ class DAP(DebuggerBase, metaclass=abc.ABCMeta):
     def _add_breakpoint(self, file, line):
         return self._add_conditional_breakpoint(file, line, None)
 
+    def add_function_breakpoint(self, name: str):
+        if not self._debugger_state.capabilities.supportsFunctionBreakpoints:
+            raise DebuggerException("Debugger does not support function breakpoints")
+        new_id = self.get_next_bp_id()
+        self.function_bp_info[new_id] = name
+        self.pending_function_breakpoints = True
+        return new_id
+
+    def add_instruction_breakpoint(self, addr: str):
+        if not self._debugger_state.capabilities.supportsInstructionBreakpoints:
+            raise DebuggerException("Debugger does not support instruction breakpoints")
+        new_id = self.get_next_bp_id()
+        self.instruction_bp_info[new_id] = addr
+        self.pending_instruction_breakpoints = True
+        return new_id
+
     def _add_conditional_breakpoint(self, file, line, condition):
         new_id = self.get_next_bp_id()
         self.file_to_bp[file].append(new_id)
@@ -576,38 +620,73 @@ class DAP(DebuggerBase, metaclass=abc.ABCMeta):
         self.pending_breakpoints = True
         return new_id
 
+    def _update_breakpoint_ids_after_request(self, dex_bp_ids: list, response: dict):
+        dap_bp_ids = [bp["id"] for bp in response["body"]["breakpoints"]]
+        if len(dex_bp_ids) != len(dap_bp_ids):
+            self.context.logger.error(
+                f"Sent request to set {len(dex_bp_ids)} breakpoints, but received {len(dap_bp_ids)} in response."
+            )
+        visited_dap_ids = set()
+        for i, dex_bp_id in enumerate(dex_bp_ids):
+            dap_bp_id = dap_bp_ids[i]
+            self.dex_id_to_dap_id[dex_bp_id] = dap_bp_id
+            # We take the mappings in the response as the canonical mapping, meaning that if the debug server has
+            # simply *changed* the DAP ID for a breakpoint we overwrite the existing mapping rather than adding to
+            # it, but if we receive the same DAP ID for multiple Dex IDs *then* we store a one-to-many mapping.
+            if dap_bp_id in visited_dap_ids:
+                self.dap_id_to_dex_ids[dap_bp_id].append(dex_bp_id)
+            else:
+                self.dap_id_to_dex_ids[dap_bp_id] = [dex_bp_id]
+                visited_dap_ids.add(dap_bp_id)
+
     def _flush_breakpoints(self):
-        if not self.pending_breakpoints:
-            return
-        for file in self.file_to_bp.keys():
-            desired_bps = self._get_desired_bps(file)
+        # Normal and conditional breakpoints.
+        if self.pending_breakpoints:
+            self.pending_breakpoints = False
+            for file in self.file_to_bp.keys():
+                desired_bps = self._get_desired_bps(file)
+                request_id = self.send_message(
+                    self.make_set_breakpoint_request(file, desired_bps)
+                )
+                result = self._await_response(request_id, 10)
+                if not result["success"]:
+                    raise DebuggerException(f"could not set breakpoints for '{file}'")
+                # The debug adapter may have chosen to merge our breakpoints. From here we need to identify such cases and
+                # handle them so that our internal bookkeeping is correct.
+                dex_bp_ids = self.get_current_bps(file)
+                self._update_breakpoint_ids_after_request(dex_bp_ids, result)
+
+        # Function breakpoints.
+        if self.pending_function_breakpoints:
+            self.pending_function_breakpoints = False
+            desired_bps = list(self.function_bp_info.values())
             request_id = self.send_message(
-                self.make_set_breakpoint_request(file, desired_bps)
+                self.make_set_function_breakpoint_request(desired_bps)
             )
             result = self._await_response(request_id, 10)
             if not result["success"]:
-                raise DebuggerException(f"could not set breakpoints for '{file}'")
-            # The debug adapter may have chosen to merge our breakpoints. From here we need to identify such cases and
-            # handle them so that our internal bookkeeping is correct.
-            dex_bp_ids = self.get_current_bps(file)
-            dap_bp_ids = [bp["id"] for bp in result["body"]["breakpoints"]]
-            if len(dex_bp_ids) != len(dap_bp_ids):
-                self.context.logger.error(
-                    f"Sent request to set {len(dex_bp_ids)} breakpoints, but received {len(dap_bp_ids)} in response."
+                raise DebuggerException(
+                    f"could not set function breakpoints: '{desired_bps}'"
                 )
-            visited_dap_ids = set()
-            for i, dex_bp_id in enumerate(dex_bp_ids):
-                dap_bp_id = dap_bp_ids[i]
-                self.dex_id_to_dap_id[dex_bp_id] = dap_bp_id
-                # We take the mappings in the response as the canonical mapping, meaning that if the debug server has
-                # simply *changed* the DAP ID for a breakpoint we overwrite the existing mapping rather than adding to
-                # it, but if we receive the same DAP ID for multiple Dex IDs *then* we store a one-to-many mapping.
-                if dap_bp_id in visited_dap_ids:
-                    self.dap_id_to_dex_ids[dap_bp_id].append(dex_bp_id)
-                else:
-                    self.dap_id_to_dex_ids[dap_bp_id] = [dex_bp_id]
-                    visited_dap_ids.add(dap_bp_id)
-        self.pending_breakpoints = False
+            # We expect the breakpoint order to match in request and response.
+            dex_bp_ids = list(self.function_bp_info.keys())
+            self._update_breakpoint_ids_after_request(dex_bp_ids, result)
+
+        # Address / instruction breakpoints.
+        if self.pending_instruction_breakpoints:
+            self.pending_instruction_breakpoints = False
+            desired_bps = list(self.instruction_bp_info.values())
+            request_id = self.send_message(
+                self.make_set_instruction_breakpoint_request(desired_bps)
+            )
+            result = self._await_response(request_id, 10)
+            if not result["success"]:
+                raise DebuggerException(
+                    f"could not set instruction breakpoints: '{desired_bps}'"
+                )
+            # We expect the breakpoint order to match in request and response.
+            dex_bp_ids = list(self.instruction_bp_info.keys())
+            self._update_breakpoint_ids_after_request(dex_bp_ids, result)
 
     def _confirm_triggered_breakpoint_ids(self, dex_bp_ids):
         """Can be overridden for any specific implementations that need further processing from the debug server's
@@ -619,11 +698,12 @@ class DAP(DebuggerBase, metaclass=abc.ABCMeta):
         # Breakpoints can only have been triggered if we've hit one.
         stop_reason = self._translate_stop_reason(self._debugger_state.stopped_reason)
         if stop_reason != StopReason.BREAKPOINT:
-            return []
+            return set()
         breakpoint_ids = set(
             [
                 dex_id
                 for dap_id in self._debugger_state.stopped_bps
+                if dap_id in self.dap_id_to_dex_ids
                 for dex_id in self.dap_id_to_dex_ids[dap_id]
             ]
         )
@@ -632,8 +712,16 @@ class DAP(DebuggerBase, metaclass=abc.ABCMeta):
     def delete_breakpoints(self, ids):
         per_file_deletions = defaultdict(list)
         for dex_bp_id in ids:
-            source, _, _ = self.bp_info[dex_bp_id]
-            per_file_deletions[source].append(dex_bp_id)
+            if dex_bp_id in self.bp_info:
+                source, _, _ = self.bp_info[dex_bp_id]
+                per_file_deletions[source].append(dex_bp_id)
+            elif dex_bp_id in self.function_bp_info:
+                del self.function_bp_info[dex_bp_id]
+                self.pending_function_breakpoints = True
+            elif dex_bp_id in self.instruction_bp_info:
+                del self.instruction_bp_info[dex_bp_id]
+                self.pending_instruction_breakpoints = True
+
         for file, deleted_ids in per_file_deletions.items():
             old_len = len(self.file_to_bp[file])
             self.file_to_bp[file] = [
@@ -651,7 +739,13 @@ class DAP(DebuggerBase, metaclass=abc.ABCMeta):
         """ "Set the debugger-specific params used in a launch request."""
 
     def launch(self, cmdline):
-        assert len(self.file_to_bp.keys()) > 0
+        # FIXME: Should this be a warning or exception, rather than assert?
+        assert (
+            len(self.file_to_bp)
+            + len(self.function_bp_info)
+            + len(self.instruction_bp_info)
+            > 0
+        ), "Expected at least one breakpoint before launching"
 
         if self.context.options.target_run_args:
             cmdline += shlex.split(self.context.options.target_run_args)
diff --git a/cross-project-tests/debuginfo-tests/dexter/dex/debugger/DebuggerBase.py b/cross-project-tests/debuginfo-tests/dexter/dex/debugger/DebuggerBase.py
index bf7552bd5fe3..f8bee4ecb423 100644
--- a/cross-project-tests/debuginfo-tests/dexter/dex/debugger/DebuggerBase.py
+++ b/cross-project-tests/debuginfo-tests/dexter/dex/debugger/DebuggerBase.py
@@ -166,6 +166,22 @@ class DebuggerBase(object, metaclass=abc.ABCMeta):
         """Returns a unique opaque breakpoint id."""
         pass
 
+    def add_function_breakpoint(self, name):
+        """Returns a unique opaque breakpoint id.
+
+        The ID type depends on the debugger being used, but will probably be
+        an int.
+        """
+        raise NotImplementedError()
+
+    def add_instruction_breakpoint(self, addr):
+        """Returns a unique opaque breakpoint id.
+
+        The ID type depends on the debugger being used, but will probably be
+        an int.
+        """
+        raise NotImplementedError()
+
     @abc.abstractmethod
     def delete_breakpoints(self, ids):
         """Delete a set of breakpoints by ids.
@@ -217,6 +233,17 @@ class DebuggerBase(object, metaclass=abc.ABCMeta):
     def evaluate_expression(self, expression, frame_idx=0) -> ValueIR:
         pass
 
+    def get_pc(self, frame_idx: int = 0) -> str:
+        """Get the current PC in frame at frame_idx depth.
+        frame_idx 0 is the current function.
+        """
+        r = self.evaluate_expression("$pc", frame_idx)
+        if not r.could_evaluate or r.is_optimized_away or r.is_irretrievable:
+            raise DebuggerException(
+                "evaluating '$pc' failed - possibly unsupported by the debugger"
+            )
+        return r.value
+
     def _external_to_debug_path(self, path):
         if not self.options.debugger_use_relative_paths:
             return path
diff --git a/cross-project-tests/debuginfo-tests/dexter/dex/debugger/DebuggerControllers/ConditionalController.py b/cross-project-tests/debuginfo-tests/dexter/dex/debugger/DebuggerControllers/ConditionalController.py
index c53f1419ee13..f84c4fd153c7 100644
--- a/cross-project-tests/debuginfo-tests/dexter/dex/debugger/DebuggerControllers/ConditionalController.py
+++ b/cross-project-tests/debuginfo-tests/dexter/dex/debugger/DebuggerControllers/ConditionalController.py
@@ -22,7 +22,7 @@ from dex.debugger.DebuggerControllers.DebuggerControllerBase import (
 from dex.debugger.DebuggerBase import DebuggerBase
 from dex.utils.Exceptions import DebuggerException
 from dex.utils.Timeout import Timeout
-
+from dex.dextIR import LocIR
 
 class BreakpointRange:
     """A range of breakpoints and a set of conditions.
@@ -51,6 +51,9 @@ class BreakpointRange:
         values: list,
         hit_count: int,
         finish_on_remove: bool,
+        is_continue: bool = False,
+        function: str = None,
+        addr: str = None,
     ):
         self.expression = expression
         self.path = path
@@ -60,6 +63,72 @@ class BreakpointRange:
         self.max_hit_count = hit_count
         self.current_hit_count = 0
         self.finish_on_remove = finish_on_remove
+        self.is_continue = is_continue
+        self.function = function
+        self.addr = addr
+
+    def limit_steps(
+        expression: str,
+        path: str,
+        range_from: int,
+        range_to: int,
+        values: list,
+        hit_count: int,
+    ):
+        return BreakpointRange(
+            expression,
+            path,
+            range_from,
+            range_to,
+            values,
+            hit_count,
+            False,
+        )
+
+    def finish_test(
+        expression: str, path: str, on_line: int, values: list, hit_count: int
+    ):
+        return BreakpointRange(
+            expression,
+            path,
+            on_line,
+            on_line,
+            values,
+            hit_count,
+            True,
+        )
+
+    def continue_from_to(
+        expression: str,
+        path: str,
+        from_line: int,
+        to_line: int,
+        values: list,
+        hit_count: int,
+    ):
+        return BreakpointRange(
+            expression,
+            path,
+            from_line,
+            to_line,
+            values,
+            hit_count,
+            finish_on_remove=False,
+            is_continue=True,
+        )
+
+    def step_function(function: str, path: str, hit_count: int):
+        return BreakpointRange(
+            None,
+            path,
+            None,
+            None,
+            None,
+            hit_count,
+            finish_on_remove=False,
+            is_continue=False,
+            function=function,
+        )
 
     def has_conditions(self):
         return self.expression is not None
@@ -96,34 +165,40 @@ class ConditionalController(DebuggerControllerBase):
     def _build_bp_ranges(self):
         commands = self.step_collection.commands
         self._bp_ranges = []
-        try:
-            limit_commands = commands["DexLimitSteps"]
-            for lc in limit_commands:
-                bpr = BreakpointRange(
-                    lc.expression,
-                    lc.path,
-                    lc.from_line,
-                    lc.to_line,
-                    lc.values,
-                    lc.hit_count,
-                    False,
-                )
-                self._bp_ranges.append(bpr)
-        except KeyError:
+
+        cond_controller_cmds = ["DexLimitSteps", "DexStepFunction", "DexContinue"]
+        if not any(c in commands for c in cond_controller_cmds):
             raise DebuggerException(
-                "Missing DexLimitSteps commands, cannot conditionally step."
+                f"No conditional commands {cond_controller_cmds}, cannot conditionally step."
             )
+
+        if "DexLimitSteps" in commands:
+            for c in commands["DexLimitSteps"]:
+                bpr = BreakpointRange.limit_steps(
+                    c.expression,
+                    c.path,
+                    c.from_line,
+                    c.to_line,
+                    c.values,
+                    c.hit_count,
+                )
+                self._bp_ranges.append(bpr)
         if "DexFinishTest" in commands:
-            finish_commands = commands["DexFinishTest"]
-            for ic in finish_commands:
-                bpr = BreakpointRange(
-                    ic.expression,
-                    ic.path,
-                    ic.on_line,
-                    ic.on_line,
-                    ic.values,
-                    ic.hit_count + 1,
-                    True,
+            for c in commands["DexFinishTest"]:
+                bpr = BreakpointRange.finish_test(
+                    c.expression, c.path, c.on_line, c.values, c.hit_count + 1
+                )
+                self._bp_ranges.append(bpr)
+        if "DexContinue" in commands:
+            for c in commands["DexContinue"]:
+                bpr = BreakpointRange.continue_from_to(
+                    c.expression, c.path, c.from_line, c.to_line, c.values, c.hit_count
+                )
+                self._bp_ranges.append(bpr)
+        if "DexStepFunction" in commands:
+            for c in commands["DexStepFunction"]:
+                bpr = BreakpointRange.step_function(
+                    c.get_function(), c.path, c.hit_count
                 )
                 self._bp_ranges.append(bpr)
 
@@ -138,6 +213,9 @@ class ConditionalController(DebuggerControllerBase):
                         bpr.path, bpr.range_from, cond_expr
                     )
                     self._leading_bp_handles[id] = bpr
+            elif bpr.function is not None:
+                id = self.debugger.add_function_breakpoint(bpr.function)
+                self._leading_bp_handles[id] = bpr
             else:
                 # Add an unconditional breakpoint.
                 id = self.debugger.add_breakpoint(bpr.path, bpr.range_from)
@@ -163,6 +241,9 @@ class ConditionalController(DebuggerControllerBase):
         timed_out = False
         total_timeout = Timeout(self.context.options.timeout_total)
 
+        step_function_backtraces: list[list[str]] = []
+        self.instr_bp_ids = set()
+
         while not self.debugger.is_finished:
             breakpoint_timeout = Timeout(self.context.options.timeout_breakpoint)
             while self.debugger.is_running and not timed_out:
@@ -185,21 +266,25 @@ class ConditionalController(DebuggerControllerBase):
                 break
 
             step_info = self.debugger.get_step_info(self._watches, self._step_index)
+            backtrace = None
             if step_info.current_frame:
-                self._step_index += 1
-                update_step_watches(
-                    step_info, self._watches, self.step_collection.commands
-                )
-                self.step_collection.new_step(self.context, step_info)
+                backtrace = [f.function for f in step_info.frames]
 
+            record_step = False
+            debugger_continue = False
             bp_to_delete = []
             for bp_id in self.debugger.get_triggered_breakpoint_ids():
                 try:
                     # See if this is one of our leading breakpoints.
                     bpr = self._leading_bp_handles[bp_id]
+                    record_step = True
                 except KeyError:
                     # This is a trailing bp. Mark it for removal.
                     bp_to_delete.append(bp_id)
+                    if bp_id in self.instr_bp_ids:
+                        self.instr_bp_ids.remove(bp_id)
+                    else:
+                        record_step = True
                     continue
 
                 bpr.add_hit()
@@ -208,17 +293,94 @@ class ConditionalController(DebuggerControllerBase):
                         exit_desired = True
                     bp_to_delete.append(bp_id)
                     del self._leading_bp_handles[bp_id]
-                # Add a range of trailing breakpoints covering the lines
-                # requested in the DexLimitSteps command. Ignore first line as
-                # that's covered by the leading bp we just hit and include the
-                # final line.
-                for line in range(bpr.range_from + 1, bpr.range_to + 1):
-                    self.debugger.add_breakpoint(bpr.path, line)
+
+                if bpr.function is not None:
+                    if step_info.frames:
+                        # Add this backtrace to the stack. While the current
+                        # backtrace matches the top of the stack we'll step,
+                        # and while there's a backtrace in the stack that
+                        # is a subset of the current backtrace we'll step-out.
+                        if (
+                            len(step_function_backtraces) == 0
+                            or backtrace != step_function_backtraces[-1]
+                        ):
+                            step_function_backtraces.append(backtrace)
+
+                            # Add an address breakpoint so we don't fall out
+                            # the end of nested DexStepFunctions with a DexContinue.
+                            addr = self.debugger.get_pc(frame_idx=1)
+                            instr_id = self.debugger.add_instruction_breakpoint(addr)
+                            # Note the breakpoint so we don't log the source location
+                            # it in the trace later.
+                            self.instr_bp_ids.add(instr_id)
+
+                elif bpr.is_continue:
+                    debugger_continue = True
+                    if bpr.range_to is not None:
+                        self.debugger.add_breakpoint(bpr.path, bpr.range_to)
+
+                else:
+                    # Add a range of trailing breakpoints covering the lines
+                    # requested in the DexLimitSteps command. Ignore first line as
+                    # that's covered by the leading bp we just hit and include the
+                    # final line.
+                    for line in range(bpr.range_from + 1, bpr.range_to + 1):
+                        id = self.debugger.add_breakpoint(bpr.path, line)
 
             # Remove any trailing or expired leading breakpoints we just hit.
             self.debugger.delete_breakpoints(bp_to_delete)
 
+            debugger_next = False
+            debugger_out = False
+            if not debugger_continue and step_info.current_frame and step_info.frames:
+                while len(step_function_backtraces) > 0:
+                    match_subtrace = False  # Backtrace contains a target trace.
+                    match_trace = False  # Backtrace matches top of target stack.
+
+                    # The top of the step_function_backtraces stack contains a
+                    # backtrace that we want to step through. Check if the
+                    # current backtrace ("backtrace") either matches that trace
+                    # or otherwise contains it.
+                    target_backtrace = step_function_backtraces[-1]
+                    if len(backtrace) >= len(target_backtrace):
+                        match_trace = len(backtrace) == len(target_backtrace)
+                        # Check if backtrace contains target_backtrace, matching
+                        # from the end (bottom of call stack) backwards.
+                        match_subtrace = (
+                            backtrace[-len(target_backtrace) :] == target_backtrace
+                        )
+
+                    if match_trace:
+                        # We want to step through this function; do so and
+                        # log the steps in the step trace.
+                        debugger_next = True
+                        record_step = True
+                        break
+                    elif match_subtrace:
+                        # There's a function we care about buried in the
+                        # current backtrace. Step-out until we get to it.
+                        debugger_out = True
+                        break
+                    else:
+                        # Drop backtraces that are not match_subtraces of the current
+                        # backtrace; the functions we wanted to step through
+                        # there are no longer reachable.
+                        step_function_backtraces.pop()
+
+            if record_step and step_info.current_frame:
+                self._step_index += 1
+                # Record the step.
+                update_step_watches(
+                    step_info, self._watches, self.step_collection.commands
+                )
+                self.step_collection.new_step(self.context, step_info)
+
             if exit_desired:
                 break
-            self.debugger.go()
+            elif debugger_next:
+                self.debugger.step_next()
+            elif debugger_out:
+                self.debugger.step_out()
+            else:
+                self.debugger.go()
             time.sleep(self._pause_between_steps)
diff --git a/cross-project-tests/debuginfo-tests/dexter/dex/debugger/lldb/LLDB.py b/cross-project-tests/debuginfo-tests/dexter/dex/debugger/lldb/LLDB.py
index 4263fdb5aa01..73b2a4dd36d0 100644
--- a/cross-project-tests/debuginfo-tests/dexter/dex/debugger/lldb/LLDB.py
+++ b/cross-project-tests/debuginfo-tests/dexter/dex/debugger/lldb/LLDB.py
@@ -232,7 +232,7 @@ class LLDB(DebuggerBase):
                     ):
                         stepped_to_breakpoint = True
             if stepped_to_breakpoint:
-                self._thread.StepInto()
+                self._process.Continue()
 
     def go(self) -> ReturnCode:
         self._process.Continue()
@@ -431,8 +431,15 @@ class LLDBDAP(DAP):
             if not trace_response["success"]:
                 raise DebuggerException("failed to get stack frames")
             stackframes = trace_response["body"]["stackFrames"]
-            path = stackframes[0]["source"]["path"]
             addr = stackframes[0]["instructionPointerReference"]
+            try:
+                path = stackframes[0]["source"]["path"]
+            except KeyError:
+                # We may have no path, e.g., if the module hasn't loaded or
+                # there's no debug info. If that's the case we won't have
+                # bound a source-location breakpoint here, so we can bail now.
+                return
+
             if any(
                 self._debugger_state.bp_addr_map.get(self.dex_id_to_dap_id[dex_bp_id])
                 == addr
@@ -441,7 +448,7 @@ class LLDBDAP(DAP):
                 # Step again now to get to the breakpoint.
                 step_req_id = self.send_message(
                     self.make_request(
-                        "stepIn", {"threadId": self._debugger_state.thread}
+                        "continue", {"threadId": self._debugger_state.thread}
                     )
                 )
                 response = self._await_response(step_req_id)
@@ -528,6 +535,16 @@ class LLDBDAP(DAP):
         manually check conditions here."""
         confirmed_breakpoint_ids = set()
         for dex_bp_id in dex_bp_ids:
+            # Function and instruction breakpoints don't use conditions.
+            # FIXME: That's not a DAP restriction, so they could in future.
+            if dex_bp_id not in self.bp_info:
+                assert (
+                    dex_bp_id in self.function_bp_info
+                    or dex_bp_id in self.instruction_bp_info
+                )
+                confirmed_breakpoint_ids.add(dex_bp_id)
+                continue
+
             _, _, cond = self.bp_info[dex_bp_id]
             if cond is None:
                 confirmed_breakpoint_ids.add(dex_bp_id)
diff --git a/cross-project-tests/debuginfo-tests/dexter/dex/tools/test/Tool.py b/cross-project-tests/debuginfo-tests/dexter/dex/tools/test/Tool.py
index c366062cec7a..693c05b97af7 100644
--- a/cross-project-tests/debuginfo-tests/dexter/dex/tools/test/Tool.py
+++ b/cross-project-tests/debuginfo-tests/dexter/dex/tools/test/Tool.py
@@ -121,7 +121,8 @@ class Tool(TestToolBase):
 
         self.context.options.source_files.extend(list(new_source_files))
 
-        if "DexLimitSteps" in step_collection.commands:
+        cond_controller_cmds = ["DexLimitSteps", "DexStepFunction", "DexContinue"]
+        if any(c in step_collection.commands for c in cond_controller_cmds):
             debugger_controller = ConditionalController(self.context, step_collection)
         else:
             debugger_controller = DefaultController(self.context, step_collection)
diff --git a/cross-project-tests/debuginfo-tests/dexter/feature_tests/commands/control/dex-continue.cpp b/cross-project-tests/debuginfo-tests/dexter/feature_tests/commands/control/dex-continue.cpp
new file mode 100644
index 000000000000..2d5cbe04569d
--- /dev/null
+++ b/cross-project-tests/debuginfo-tests/dexter/feature_tests/commands/control/dex-continue.cpp
@@ -0,0 +1,64 @@
+// Purpose:
+//    Test \DexStepFunction usage with \DexContinue. Continuing out of `c`
+//    should result in stepping resuming in `a` (check there's no issue when
+//    `b` is inlined). Then continuing out of `a` should run on to `f` where
+//    stepping resumes again. Stepping out of `f` into `main`, run free
+//    again until the program exits.
+//
+// This command is only implemented for debuggers with DAP support.
+// UNSUPPORTED: system-windows
+//
+// RUN: %dexter_regression_test_cxx_build %s -o %t
+// RUN: %dexter_regression_test_run -v --binary %t -- %s 2>&1 | FileCheck %s
+
+int g = 0;
+int c(int) {
+  ++g;
+  ++g;
+  ++g;
+  ++g;
+  ++g;
+  return 0;
+}
+
+__attribute__((always_inline))
+int b(int) {
+  ++g;
+  return c(g);
+}
+
+int a(int) {
+  ++g;
+  b(g);
+  ++g;
+  return g;
+}
+
+void f() {
+  ++g;
+}
+
+int main() {
+  int x = a(g);
+  f();
+  return x;
+}
+
+// DexStepFunction('c')
+// DexContinue(from_line=17, to_line=19)
+// DexContinue(from_line=20)
+// DexStepFunction('a')
+// DexContinue(from_line=33)
+// DexStepFunction('f')
+
+// CHECK:      ## BEGIN ##
+// CHECK-NEXT: .   [0, "a(int)", "{{.*}}dex-continue.cpp", 31, 3, "StopReason.BREAKPOINT", "StepKind.FUNC", []]
+// CHECK-NEXT: .   [1, "a(int)", "{{.*}}dex-continue.cpp", 32, 5, "StopReason.STEP", "StepKind.VERTICAL_FORWARD", []]
+// CHECK-NEXT: .   .   .   [2, "c(int)", "{{.*}}dex-continue.cpp", 16, 3, "StopReason.BREAKPOINT", "StepKind.FUNC", []]
+// CHECK-NEXT: .   .   .   [3, "c(int)", "{{.*}}dex-continue.cpp", 17, 3, "StopReason.BREAKPOINT", "StepKind.VERTICAL_FORWARD", []]
+// CHECK-NEXT: .   .   .   [4, "c(int)", "{{.*}}dex-continue.cpp", 19, 3, "StopReason.BREAKPOINT", "StepKind.VERTICAL_FORWARD", []]
+// CHECK-NEXT: .   .   .   [5, "c(int)", "{{.*}}dex-continue.cpp", 20, 3, "StopReason.BREAKPOINT", "StepKind.VERTICAL_FORWARD", []]
+// CHECK-NEXT: .   [6, "a(int)", "{{.*}}dex-continue.cpp", 33, 3, "StopReason.BREAKPOINT", "StepKind.VERTICAL_FORWARD", []]
+// CHECK-NEXT: .   [7, "f()", "{{.*}}dex-continue.cpp", 38, 3, "StopReason.BREAKPOINT", "StepKind.VERTICAL_FORWARD", []]
+// CHECK-NEXT: .   [8, "f()", "{{.*}}dex-continue.cpp", 39, 1, "StopReason.STEP", "StepKind.VERTICAL_FORWARD", []]
+// CHECK-NEXT: ## END (9 steps) ##
diff --git a/cross-project-tests/debuginfo-tests/dexter/feature_tests/commands/control/dex_step_function.cpp b/cross-project-tests/debuginfo-tests/dexter/feature_tests/commands/control/dex_step_function.cpp
new file mode 100644
index 000000000000..900e10b64a96
--- /dev/null
+++ b/cross-project-tests/debuginfo-tests/dexter/feature_tests/commands/control/dex_step_function.cpp
@@ -0,0 +1,39 @@
+// Purpose:
+//    \DexStepFunction smoke test. Only steps in a and c should be logged.
+//
+// This command is only implemented for debuggers with DAP support.
+// UNSUPPORTED: system-windows
+//
+// RUN: %dexter_regression_test_cxx_build %s -o %t
+// RUN: %dexter_regression_test_run -v --binary %t -- %s 2>&1 | FileCheck %s
+
+int g = 0;
+int c(int) {
+  ++g;
+  return 0;
+}
+
+int b(int) {
+  ++g;
+  return c(g);
+}
+
+int a(int) {
+  ++g;
+  return b(g);
+}
+
+int main() {
+  return a(g);
+}
+
+// DexStepFunction('a')
+// DexStepFunction('c')
+
+// CHECK:      ## BEGIN ##
+// CHECK-NEXT:.   [0, "a(int)", "{{.*}}dex_step_function.cpp", 22, 3, "StopReason.BREAKPOINT", "StepKind.FUNC", []]
+// CHECK-NEXT:.   [1, "a(int)", "{{.*}}dex_step_function.cpp", 23, 12, "StopReason.STEP", "StepKind.VERTICAL_FORWARD", []]
+// CHECK-NEXT:.   .   .   [2, "c(int)", "{{.*}}dex_step_function.cpp", 12, 3, "StopReason.BREAKPOINT", "StepKind.FUNC", []]
+// CHECK-NEXT:.   .   .   [3, "c(int)", "{{.*}}dex_step_function.cpp", 13, 3, "StopReason.STEP", "StepKind.VERTICAL_FORWARD", []]
+// CHECK-NEXT:.   [4, "a(int)", "{{.*}}dex_step_function.cpp", 23, 3, "StopReason.STEP", "StepKind.HORIZONTAL_BACKWARD", []]
+// CHECK-NEXT: ## END (5 steps) ##
diff --git a/cross-project-tests/debuginfo-tests/dexter/feature_tests/commands/perfect/dex_declare_address/expression_address.cpp b/cross-project-tests/debuginfo-tests/dexter/feature_tests/commands/perfect/dex_declare_address/expression_address.cpp
index 2bb83850e2a1..0f4463338bba 100644
--- a/cross-project-tests/debuginfo-tests/dexter/feature_tests/commands/perfect/dex_declare_address/expression_address.cpp
+++ b/cross-project-tests/debuginfo-tests/dexter/feature_tests/commands/perfect/dex_declare_address/expression_address.cpp
@@ -14,4 +14,4 @@ int main() {
 
 // DexDeclareAddress('x_addr', '&x', on_line=ref('test_line'))
 // DexExpectWatchValue('&x', address('x_addr'), on_line=ref('test_line'))
-// DexExpectWatchValue('&y', address('x_addr'), on_line=ref('test_line'))
+// DexExpectWatchValue('y', address('x_addr'), on_line=ref('test_line'))
diff --git a/cross-project-tests/debuginfo-tests/dexter/feature_tests/commands/perfect/dex_finish_test/limit_steps_simple.cpp b/cross-project-tests/debuginfo-tests/dexter/feature_tests/commands/perfect/dex_finish_test/limit_steps_simple.cpp
index 27505d5a3f5a..923f596ab84e 100644
--- a/cross-project-tests/debuginfo-tests/dexter/feature_tests/commands/perfect/dex_finish_test/limit_steps_simple.cpp
+++ b/cross-project-tests/debuginfo-tests/dexter/feature_tests/commands/perfect/dex_finish_test/limit_steps_simple.cpp
@@ -12,10 +12,11 @@
 // CHECK: limit_steps_simple.cpp
 
 int main() {
-    int x = 0; // DexLabel('start')
-    x = 1;
+    int x = 0;
+    x = 1; // DexLabel('start')
     x = 2; // DexLabel('finish_line')
-} // DexLabel('finish')
+    return 0; // DexLabel('finish')
+}
 
 // DexLimitSteps(from_line=ref('start'), to_line=ref('finish'))
 // DexFinishTest(on_line=ref('finish_line'))
diff --git a/cross-project-tests/debuginfo-tests/dexter/feature_tests/subtools/test/err_label_kwarg.cpp b/cross-project-tests/debuginfo-tests/dexter/feature_tests/subtools/test/err_label_kwarg.cpp
index b0bd50a248d1..da1573525253 100644
--- a/cross-project-tests/debuginfo-tests/dexter/feature_tests/subtools/test/err_label_kwarg.cpp
+++ b/cross-project-tests/debuginfo-tests/dexter/feature_tests/subtools/test/err_label_kwarg.cpp
@@ -2,7 +2,7 @@
 //    Check that bad keyword args in \DexLabel are reported.
 //    Use --binary switch to trick dexter into skipping the build step.
 //
-// RUN: not %dexter_base test --binary %s --debugger 'lldb' -- %s | FileCheck %s
+// RUN: not %dexter_base test --binary %s %dexter_regression_test_debugger_args -- %s | FileCheck %s
 // CHECK: parser error:{{.*}}err_label_kwarg.cpp(8): unexpected named args: bad_arg
 
 // DexLabel('test', bad_arg=0)
diff --git a/cross-project-tests/debuginfo-tests/dexter/feature_tests/subtools/test/err_limit_steps_no_values.cpp b/cross-project-tests/debuginfo-tests/dexter/feature_tests/subtools/test/err_limit_steps_no_values.cpp
index 64e41495ece1..978450eeb8cd 100644
--- a/cross-project-tests/debuginfo-tests/dexter/feature_tests/subtools/test/err_limit_steps_no_values.cpp
+++ b/cross-project-tests/debuginfo-tests/dexter/feature_tests/subtools/test/err_limit_steps_no_values.cpp
@@ -3,7 +3,7 @@
 //    in a \DexLimitSteps command results in a useful error message.
 //    Use --binary switch to trick dexter into skipping the build step.
 //
-// RUN: not %dexter_base test --binary %s --debugger 'lldb' -- %s | FileCheck %s
+// RUN: not %dexter_base test --binary %s %dexter_regression_test_debugger_args -- %s | FileCheck %s
 // CHECK: parser error:{{.*}}err_limit_steps_no_values.cpp(9): expected 0 or at least 2 positional arguments
 
 // DexLimitSteps('test')
diff --git a/cross-project-tests/debuginfo-tests/dexter/feature_tests/subtools/test/err_paren.cpp b/cross-project-tests/debuginfo-tests/dexter/feature_tests/subtools/test/err_paren.cpp
index 5a35b3a512be..e80b34da24ac 100644
--- a/cross-project-tests/debuginfo-tests/dexter/feature_tests/subtools/test/err_paren.cpp
+++ b/cross-project-tests/debuginfo-tests/dexter/feature_tests/subtools/test/err_paren.cpp
@@ -4,14 +4,11 @@
 //      Check directives are in check.txt to prevent dexter reading any embedded
 //      commands.
 //
-// Note: Despite using 'lldb' as the debugger, lldb is not actually required
-//       as the test should finish before lldb would be invoked.
-//
 // RUN: %dexter_regression_test_cxx_build %s -o %t
-// RUN: not %dexter_base test --binary %t --debugger 'lldb' \
+// RUN: not %dexter_base test --binary %t %dexter_regression_test_debugger_args \
 // RUN:     -v -- %s | FileCheck %s --match-full-lines --strict-whitespace
 //
-// CHECK:parser error:{{.*}}err_paren.cpp(22): Unbalanced parenthesis starting here
+// CHECK:parser error:{{.*}}err_paren.cpp(19): Unbalanced parenthesis starting here
 // CHECK:// {{Dex}}ExpectWatchValue(
 // CHECK:                      ^
 
diff --git a/cross-project-tests/debuginfo-tests/dexter/feature_tests/subtools/test/err_paren_mline.cpp b/cross-project-tests/debuginfo-tests/dexter/feature_tests/subtools/test/err_paren_mline.cpp
index 0044b3b6eff0..8d5a9b057599 100644
--- a/cross-project-tests/debuginfo-tests/dexter/feature_tests/subtools/test/err_paren_mline.cpp
+++ b/cross-project-tests/debuginfo-tests/dexter/feature_tests/subtools/test/err_paren_mline.cpp
@@ -4,14 +4,11 @@
 //      Check directives are in check.txt to prevent dexter reading any embedded
 //      commands.
 //
-// Note: Despite using 'lldb' as the debugger, lldb is not actually required
-//       as the test should finish before lldb would be invoked.
-//
 // RUN: %dexter_regression_test_cxx_build %s -o %t
-// RUN: not %dexter_base test --binary %t --debugger "lldb" \
+// RUN: not %dexter_base test --binary %t %dexter_regression_test_debugger_args \
 // RUN:     -v -- %s | FileCheck %s --match-full-lines --strict-whitespace
 //
-// CHECK:parser error:{{.*}}err_paren_mline.cpp(23): Unbalanced parenthesis starting here
+// CHECK:parser error:{{.*}}err_paren_mline.cpp(20): Unbalanced parenthesis starting here
 // CHECK:{{Dex}}ExpectWatchValue(
 // CHECK:                   ^
 
diff --git a/cross-project-tests/debuginfo-tests/dexter/feature_tests/subtools/test/err_syntax.cpp b/cross-project-tests/debuginfo-tests/dexter/feature_tests/subtools/test/err_syntax.cpp
index 599202544213..7e019df26e9b 100644
--- a/cross-project-tests/debuginfo-tests/dexter/feature_tests/subtools/test/err_syntax.cpp
+++ b/cross-project-tests/debuginfo-tests/dexter/feature_tests/subtools/test/err_syntax.cpp
@@ -4,14 +4,11 @@
 //      Check directives are in check.txt to prevent dexter reading any embedded
 //      commands.
 //
-// Note: Despite using 'lldb' as the debugger, lldb is not actually required
-//       as the test should finish before lldb would be invoked.
-//
 // RUN: %dexter_regression_test_cxx_build %s -o %t
-// RUN: not %dexter_base test --binary %t --debugger "lldb" \
+// RUN: not %dexter_base test --binary %t %dexter_regression_test_debugger_args \
 // RUN:     -v -- %s | FileCheck %s --match-full-lines --strict-whitespace
 //
-// CHECK:parser error:{{.*}}err_syntax.cpp(21): invalid syntax
+// CHECK:parser error:{{.*}}err_syntax.cpp(18): invalid syntax
 // CHECK:// {{Dex}}ExpectWatchValue(,'a', 3, 3, 3, 3, on_line=0)
 // CHECK:                       ^
 
diff --git a/cross-project-tests/debuginfo-tests/dexter/feature_tests/subtools/test/err_syntax_dexdeclarefile.cpp b/cross-project-tests/debuginfo-tests/dexter/feature_tests/subtools/test/err_syntax_dexdeclarefile.cpp
index 40cc1581f85f..0fdf255eded8 100644
--- a/cross-project-tests/debuginfo-tests/dexter/feature_tests/subtools/test/err_syntax_dexdeclarefile.cpp
+++ b/cross-project-tests/debuginfo-tests/dexter/feature_tests/subtools/test/err_syntax_dexdeclarefile.cpp
@@ -3,7 +3,7 @@
 //      they appeared in rather than the current declared file.
 //
 // RUN: %dexter_regression_test_cxx_build %s -o %t
-// RUN: not %dexter_base test --binary %t --debugger 'lldb' -v -- %s \
+// RUN: not %dexter_base test --binary %t %dexter_regression_test_debugger_args -v -- %s \
 // RUN:     | FileCheck %s --implicit-check-not=FAIL-FILENAME-MATCH
 
 // CHECK: err_syntax_dexdeclarefile.cpp(14): Undeclared address: 'not_been_declared'
diff --git a/cross-project-tests/debuginfo-tests/dexter/feature_tests/subtools/test/err_syntax_mline.cpp b/cross-project-tests/debuginfo-tests/dexter/feature_tests/subtools/test/err_syntax_mline.cpp
index 71b23a2a3a8b..342f2a53010e 100644
--- a/cross-project-tests/debuginfo-tests/dexter/feature_tests/subtools/test/err_syntax_mline.cpp
+++ b/cross-project-tests/debuginfo-tests/dexter/feature_tests/subtools/test/err_syntax_mline.cpp
@@ -4,14 +4,11 @@
 //      Check directives are in check.txt to prevent dexter reading any embedded
 //      commands.
 //
-// Note: Despite using 'lldb' as the debugger, lldb is not actually required
-//       as the test should finish before lldb would be invoked.
-//
 // RUN: %dexter_regression_test_cxx_build %s -o %t
-// RUN: not %dexter_base test --binary %t --debugger "lldb" \
+// RUN: not %dexter_base test --binary %t %dexter_regression_test_debugger_args \
 // RUN:     -v -- %s | FileCheck %s --match-full-lines --strict-whitespace
 //
-// CHECK:parser error:{{.*}}err_syntax_mline.cpp(24): invalid syntax
+// CHECK:parser error:{{.*}}err_syntax_mline.cpp(21): invalid syntax
 // CHECK:    ,'a', 3, 3, 3, 3, on_line=0)
 // CHECK:    ^
 
diff --git a/cross-project-tests/debuginfo-tests/dexter/feature_tests/subtools/test/err_type.cpp b/cross-project-tests/debuginfo-tests/dexter/feature_tests/subtools/test/err_type.cpp
index 264515496f1c..286530410193 100644
--- a/cross-project-tests/debuginfo-tests/dexter/feature_tests/subtools/test/err_type.cpp
+++ b/cross-project-tests/debuginfo-tests/dexter/feature_tests/subtools/test/err_type.cpp
@@ -4,14 +4,11 @@
 //      Check directives are in check.txt to prevent dexter reading any embedded
 //      commands.
 //
-// Note: Despite using 'lldb' as the debugger, lldb is not actually required
-//       as the test should finish before lldb would be invoked.
-//
 // RUN: %dexter_regression_test_cxx_build %s -o %t
-// RUN: not %dexter_base test --binary %t --debugger "lldb" \
+// RUN: not %dexter_base test --binary %t %dexter_regression_test_debugger_args \
 // RUN:     -v -- %s | FileCheck %s --match-full-lines --strict-whitespace
 //
-// CHECK:parser error:{{.*}}err_type.cpp(21): expected at least two args
+// CHECK:parser error:{{.*}}err_type.cpp(18): expected at least two args
 // CHECK:// {{Dex}}ExpectWatchValue()
 // CHECK:                      ^
 
diff --git a/cross-project-tests/debuginfo-tests/dexter/feature_tests/subtools/test/err_type_mline.cpp b/cross-project-tests/debuginfo-tests/dexter/feature_tests/subtools/test/err_type_mline.cpp
index 5cbcd2d88808..1062d2816b39 100644
--- a/cross-project-tests/debuginfo-tests/dexter/feature_tests/subtools/test/err_type_mline.cpp
+++ b/cross-project-tests/debuginfo-tests/dexter/feature_tests/subtools/test/err_type_mline.cpp
@@ -4,14 +4,11 @@
 //      Check directives are in check.txt to prevent dexter reading any embedded
 //      commands.
 //
-// Note: Despite using 'lldb' as the debugger, lldb is not actually required
-//       as the test should finish before lldb would be invoked.
-//
 // RUN: %dexter_regression_test_cxx_build %s -o %t
-// RUN: not %dexter_base test --binary %t --debugger "lldb" \
+// RUN: not %dexter_base test --binary %t %dexter_regression_test_debugger_args \
 // RUN:     -v -- %s | FileCheck %s --match-full-lines --strict-whitespace
 //
-// CHECK:parser error:{{.*}}err_type_mline.cpp(22): expected at least two args
+// CHECK:parser error:{{.*}}err_type_mline.cpp(19): expected at least two args
 // CHECK:{{Dex}}ExpectWatchValue(
 // CHECK:                   ^
 
diff --git a/cross-project-tests/debuginfo-tests/dexter/feature_tests/subtools/test/source-root-dir.cpp b/cross-project-tests/debuginfo-tests/dexter/feature_tests/subtools/test/source-root-dir.cpp
index af24c5d8e572..edbafdc6bfc1 100644
--- a/cross-project-tests/debuginfo-tests/dexter/feature_tests/subtools/test/source-root-dir.cpp
+++ b/cross-project-tests/debuginfo-tests/dexter/feature_tests/subtools/test/source-root-dir.cpp
@@ -2,10 +2,8 @@
 // XFAIL:*
 // RUN: %dexter_regression_test_cxx_build \
 // RUN:     -fdebug-prefix-map=%S=/changed %s -o %t
-// RUN: %dexter --fail-lt 1.0 -w \
-// RUN:     --binary %t \
-// RUN:     --debugger %dexter_regression_test_debugger \
-// RUN:     --source-root-dir=%S --debugger-use-relative-paths -- %s
+// RUN: %dexter_regression_test_run \
+// RUN:     --binary %t --source-root-dir=%S --debugger-use-relative-paths -- %s
 
 #include <stdio.h>
 int main() {
diff --git a/cross-project-tests/lit.cfg.py b/cross-project-tests/lit.cfg.py
index a3af729f8fff..b783f6639c93 100644
--- a/cross-project-tests/lit.cfg.py
+++ b/cross-project-tests/lit.cfg.py
@@ -102,9 +102,8 @@ if "compiler-rt" in config.llvm_enabled_projects:
     config.available_features.add("compiler-rt")
 
 # Check which debuggers are available:
-lldb_path = llvm_config.use_llvm_tool("lldb", search_env="LLDB")
-
-if lldb_path is not None:
+lldb_dap_path = llvm_config.use_llvm_tool("lldb-dap")
+if lldb_dap_path is not None:
     config.available_features.add("lldb")
 
 if llvm_config.use_llvm_tool("llvm-ar"):
@@ -117,10 +116,14 @@ def configure_dexter_substitutions():
     dexter_path = os.path.join(
         config.cross_project_tests_src_root, "debuginfo-tests", "dexter", "dexter.py"
     )
-    dexter_test_cmd = '"{}" "{}" test'.format(sys.executable, dexter_path)
-    if lldb_path is not None:
-        dexter_test_cmd += ' --lldb-executable "{}"'.format(lldb_path)
-    tools.append(ToolSubst("%dexter", dexter_test_cmd))
+    tools.append(ToolSubst("%dexter", f'"{sys.executable}" "{dexter_path}" test'))
+    if lldb_dap_path is not None:
+        tools.append(
+            ToolSubst(
+                "%dexter_lldb_args",
+                f'--lldb-executable "{lldb_dap_path}" --debugger lldb-dap',
+            )
+        )
 
     # For testing other bits of dexter that aren't under the "test" subcommand,
     # have a %dexter_base substitution.
@@ -144,33 +147,17 @@ def configure_dexter_substitutions():
         dependencies = ["clang", "lldb"]
         dexter_regression_test_c_builder = "clang"
         dexter_regression_test_cxx_builder = "clang++"
-        dexter_regression_test_debugger = "lldb"
+        dexter_regression_test_debugger = "lldb-dap"
+        dexter_regression_test_additional_flags = f'--lldb-executable "{lldb_dap_path}"'
         dexter_regression_test_c_flags = "-O0 -glldb -std=gnu11"
         dexter_regression_test_cxx_flags = "-O0 -glldb -std=gnu++11"
-        dexter_regression_test_additional_flags = '--lldb-executable "{}"'.format(
-            lldb_path
-        )
 
     tools.append(
-        ToolSubst("%dexter_regression_test_c_builder", dexter_regression_test_c_builder)
-    )
-    tools.append(
         ToolSubst(
-            "%dexter_regression_test_cxx_builder", dexter_regression_test_cxx_builder
+            "%dexter_regression_test_debugger_args",
+            f"--debugger {dexter_regression_test_debugger} {dexter_regression_test_additional_flags}",
         )
     )
-    tools.append(
-        ToolSubst("%dexter_regression_test_debugger", dexter_regression_test_debugger)
-    )
-    # We don't need to distinguish cflags and ldflags because for Dexter
-    # regression tests we use clang to drive the linker, and so all flags will be
-    # passed in a single command.
-    tools.append(
-        ToolSubst("%dexter_regression_test_c_flags", dexter_regression_test_c_flags)
-    )
-    tools.append(
-        ToolSubst("%dexter_regression_test_cxx_flags", dexter_regression_test_cxx_flags)
-    )
 
     # Typical command would take the form:
     # ./path_to_py/python.exe ./path_to_dex/dexter.py test --fail-lt 1.0 -w --binary %t --debugger lldb --cflags '-O0 -g'