Add support for LLVM 20 (modulo dynamic-compile regressions)

.cirrus.yml

@@ -12,7 +12,7 @@ clone_steps_template: &CLONE_STEPS_TEMPLATE
 common_steps_template: &COMMON_STEPS_TEMPLATE
   install_lit_script: |
     # Install lit
-    rm -f /usr/lib/python3.12/EXTERNALLY-MANAGED # required for Ubuntu 24.04
+    rm -f /usr/lib/python3.13/EXTERNALLY-MANAGED # required for Ubuntu 25.04
     python3 -m pip install --user lit
     python3 -c "import lit.main; lit.main.main();" --version . | head -n 1
   clone_submodules_script: |
@@ -197,8 +197,14 @@ task:
   environment:
     CI_ARCH: x86_64
     CI_OS: linux
-    EXTRA_APT_PACKAGES: "gdmd llvm-dev libclang-common-19-dev lld"
-    EXTRA_CMAKE_FLAGS: "-DBUILD_SHARED_LIBS=ON -DBUILD_LTO_LIBS=ON -DD_COMPILER=gdmd -DLDC_LINK_MANUALLY=ON"
+    EXTRA_APT_PACKAGES: "gdmd llvm-dev libclang-common-20-dev lld libcurl4-openssl-dev"
+    # need `-DCMAKE_EXE_LINKER_FLAGS=-lcurl` to work around libcurl dependency for ldc-profdata (distro LLVM apparently built with non-default LLVM_ENABLE_CURL=ON)
+    EXTRA_CMAKE_FLAGS: >-
+      -DBUILD_SHARED_LIBS=ON
+      -DBUILD_LTO_LIBS=ON
+      -DD_COMPILER=gdmd
+      -DLDC_LINK_MANUALLY=ON
+      -DCMAKE_EXE_LINKER_FLAGS=-lcurl
     PARALLELISM: 8
     # for gdmd:
     LANG: C.UTF-8

.github/workflows/main.yml

@@ -255,6 +255,8 @@ jobs:
             os: android
             arch: armv7a
             android_x86_arch: i686
+            extra_cmake_flags: >-
+              -DLDC_INSTALL_LLVM_RUNTIME_LIBS_ARCH=arm-android
 
           - job_name: Android aarch64
             host_os: ubuntu-22.04

CMakeLists.txt

@@ -894,8 +894,15 @@ if (LDC_INSTALL_LLVM_RUNTIME_LIBS)
         if(CMAKE_SIZEOF_VOID_P EQUAL 4)
             set(compilerrt_arch_suffix "i386")
         endif()
-        copy_compilerrt_lib("clang_rt.asan-${compilerrt_arch_suffix}.lib"     "ldc_rt.asan.lib"     FALSE)
-        copy_compilerrt_lib("clang_rt.lsan-${compilerrt_arch_suffix}.lib"     "ldc_rt.lsan.lib"     FALSE)
+        if(LDC_LLVM_VER LESS 2000)
+            copy_compilerrt_lib("clang_rt.asan-${compilerrt_arch_suffix}.lib" "ldc_rt.asan.lib" FALSE)
+            copy_compilerrt_lib("clang_rt.lsan-${compilerrt_arch_suffix}.lib" "ldc_rt.lsan.lib" FALSE)
+        else()
+            copy_compilerrt_lib("clang_rt.asan_static_runtime_thunk-${compilerrt_arch_suffix}.lib"  "ldc_rt.asan_static_runtime_thunk.lib"                FALSE)
+            copy_compilerrt_lib("clang_rt.asan_dynamic_runtime_thunk-${compilerrt_arch_suffix}.lib" "ldc_rt.asan_dynamic_runtime_thunk.lib"               FALSE)
+            copy_compilerrt_lib("clang_rt.asan_dynamic-${compilerrt_arch_suffix}.lib"               "ldc_rt.asan.lib"                                     FALSE)
+            copy_compilerrt_lib("clang_rt.asan_dynamic-${compilerrt_arch_suffix}.dll"               "clang_rt.asan_dynamic-${compilerrt_arch_suffix}.dll" FALSE)
+        endif()
         copy_compilerrt_lib("clang_rt.builtins-${compilerrt_arch_suffix}.lib" "ldc_rt.builtins.lib" FALSE)
         copy_compilerrt_lib("clang_rt.profile-${compilerrt_arch_suffix}.lib"  "ldc_rt.profile.lib"  FALSE)
         copy_compilerrt_lib("clang_rt.fuzzer-${compilerrt_arch_suffix}.lib"   "ldc_rt.fuzzer.lib"   FALSE)

cmake/Modules/FindLLVM.cmake

@@ -32,7 +32,8 @@
 # We also want an user-specified LLVM_ROOT_DIR to take precedence over the
 # system default locations such as /usr/local/bin. Executing find_program()
 # multiples times is the approach recommended in the docs.
-set(llvm_config_names llvm-config-19.1 llvm-config191 llvm-config-19
+set(llvm_config_names llvm-config-20.1 llvm-config201 llvm-config-20
+                      llvm-config-19.1 llvm-config191 llvm-config-19
                       llvm-config-18.1 llvm-config181 llvm-config-18
                       llvm-config-17.0 llvm-config170 llvm-config-17
                       llvm-config-16.0 llvm-config160 llvm-config-16
@@ -47,11 +48,11 @@ if(APPLE)
     # extra fallbacks for MacPorts & Homebrew
     find_program(LLVM_CONFIG
         NAMES ${llvm_config_names}
-        PATHS /opt/local/libexec/llvm-19/bin
+        PATHS /opt/local/libexec/llvm-20/bin /opt/local/libexec/llvm-19/bin
               /opt/local/libexec/llvm-18/bin /opt/local/libexec/llvm-17/bin
               /opt/local/libexec/llvm-16/bin /opt/local/libexec/llvm-15/bin
               /opt/local/libexec/llvm/bin
-              /usr/local/opt/llvm@19/bin
+              /usr/local/opt/llvm@20/bin /usr/local/opt/llvm@19/bin
               /usr/local/opt/llvm@18/bin /usr/local/opt/llvm@17/bin
               /usr/local/opt/llvm@16/bin /usr/local/opt/llvm@15/bin
               /usr/local/opt/llvm/bin

driver/cl_options.cpp

@@ -818,17 +818,21 @@ void hideLLVMOptions() {
       "amdgpu-dump-hsa-metadata", "amdgpu-enable-flat-scratch",
       "amdgpu-enable-global-sgpr-addr", "amdgpu-enable-merge-m0",
       "amdgpu-enable-power-sched", "amdgpu-igrouplp",
-      "amdgpu-kernarg-preload-count", "amdgpu-promote-alloca-to-vector-limit",
+      "amdgpu-indirect-call-specialization-threshold",
+      "amdgpu-kernarg-preload-count", "amdgpu-module-splitting-max-depth",
+      "amdgpu-promote-alloca-to-vector-limit",
       "amdgpu-reserve-vgpr-for-sgpr-spill", "amdgpu-sdwa-peephole",
       "amdgpu-use-aa-in-codegen", "amdgpu-verify-hsa-metadata",
-      "amdgpu-vgpr-index-mode", "arm-add-build-attributes",
+      "amdgpu-vgpr-index-mode", "argext-abi-check",
+      "arm-add-build-attributes",
       "arm-implicit-it", "asm-instrumentation", "asm-show-inst",
       "atomic-counter-update-promoted", "atomic-first-counter",
-      "basic-block-sections",
+      "basic-block-address-map", "basic-block-sections",
       "basicblock-sections", "bounds-checking-single-trap",
       "bounds-checking-unique-traps", "bpf-stack-size", "cfg-hide-cold-paths",
       "cfg-hide-deoptimize-paths", "cfg-hide-unreachable-paths",
-      "code-model", "cost-kind", "cppfname", "cppfor", "cppgen",
+      "check-functions-filter", "code-model", "conditional-counter-update",
+      "cost-kind", "cppfname", "cppfor", "cppgen", "crel",
       "cvp-dont-add-nowrap-flags",
       "cvp-dont-process-adds", "debug-counter", "debug-entry-values",
       "debugger-tune", "debugify-func-limit", "debugify-level",
@@ -847,27 +851,32 @@ void hideLLVMOptions() {
       "enable-cse-in-irtranslator", "enable-cse-in-legalizer",
       "enable-emscripten-cxx-exceptions", "enable-emscripten-sjlj",
       "enable-fp-mad", "enable-gvn-hoist", "enable-gvn-memdep",
+      "enable-gvn-memoryssa",
       "enable-gvn-sink", "enable-implicit-null-checks", "enable-jmc-instrument",
-      "enable-load-in-loop-pre",
+      "enable-jump-table-to-switch", "enable-load-in-loop-pre",
       "enable-load-pre", "enable-loop-simplifycfg-term-folding",
       "enable-misched", "enable-name-compression", "enable-no-infs-fp-math",
       "enable-no-nans-fp-math", "enable-no-signed-zeros-fp-math",
       "enable-no-trapping-fp-math", "enable-objc-arc-annotations",
-      "enable-objc-arc-opts", "enable-pie", "enable-scoped-noalias",
+      "enable-objc-arc-opts", "enable-pgo-force-function-attrs",
+      "enable-pie", "enable-scoped-noalias",
       "enable-split-backedge-in-load-pre", "enable-split-loopiv-heuristic",
       "enable-tbaa", "enable-tlsdesc", "enable-unsafe-fp-math",
-      "exception-model", "exhaustive-register-search", "expensive-combines",
+      "enable-vtable-profile-use", "enable-vtable-value-profiling",
+      "exception-model", "exhaustive-register-search",
+      "expand-variadics-override", "expensive-combines",
       "experimental-debug-variable-locations",
       "experimental-debuginfo-iterators",
-      "fatal-assembler-warnings", "filter-print-funcs",
+      "fatal-assembler-warnings", "fdpic", "filter-print-funcs",
       "force-dwarf-frame-section", "force-opaque-pointers",
       "force-tail-folding-style",
       "fs-profile-debug-bw-threshold", "fs-profile-debug-prob-diff-threshold",
       "generate-merged-base-profiles",
-      "gpsize", "hash-based-counter-split", "hexagon-rdf-limit",
-      "hot-cold-split", "ignore-xcoff-visibility",
+      "gpsize", "hash-based-counter-split", "hexagon-add-build-attributes",
+      "hexagon-rdf-limit", "hot-cold-split", "hwasan-percentile-cutoff-hot",
+      "hwasan-random-rate", "ignore-xcoff-visibility",
       "imp-null-check-page-size", "imp-null-max-insts-to-consider",
-      "import-all-index", "incremental-linker-compatible",
+      "implicit-mapsyms", "import-all-index", "incremental-linker-compatible",
       "instcombine-code-sinking", "instcombine-guard-widening-window",
       "instcombine-max-iterations", "instcombine-max-num-phis",
       "instcombine-max-sink-users",
@@ -876,7 +885,9 @@ void hideLLVMOptions() {
       "instrprof-atomic-counter-update-all", "internalize-public-api-file",
       "internalize-public-api-list", "iterative-counter-promotion",
       "join-liveintervals", "jump-table-type", "large-data-threshold",
-      "limit-float-precision", "lower-global-dtors-via-cxa-atexit",
+      "limit-float-precision", "lint-abort-on-error", "loongarch-use-aa",
+      "lower-allow-check-percentile-cutoff-hot",
+      "lower-allow-check-random-rate", "lower-global-dtors-via-cxa-atexit",
       "lto-embed-bitcode", "matrix-default-layout",
       "matrix-print-after-transpose-opt", "matrix-propagate-shape",
       "max-counter-promotions", "max-counter-promotions-per-loop",
@@ -888,7 +899,7 @@ void hideLLVMOptions() {
       "mno-fixup", "mno-ldc1-sdc1", "mno-pairing", "mwarn-missing-parenthesis",
       "mwarn-noncontigious-register", "mwarn-sign-mismatch", "mxcoff-roptr",
       "no-discriminators", "no-integrated-as", "no-type-check", "no-xray-index",
-      "nozero-initialized-in-bss", "nvptx-sched4reg",
+      "nozero-initialized-in-bss", "nvptx-approx-log2f32", "nvptx-sched4reg",
       "objc-arc-annotation-target-identifier",
       "object-size-offset-visitor-max-visit-instructions",
       "pgo-block-coverage", "pgo-temporal-instrumentation",
@@ -900,21 +911,26 @@ void hideLLVMOptions() {
       "print-pipeline-passes", "profile-correlate",
       "profile-estimator-loop-weight", "profile-estimator-loop-weight",
       "profile-file", "profile-info-file", "profile-verifier-noassert",
-      "pseudo-probe-for-profiling",
+      "promote-alloca-vector-loop-user-weight", "pseudo-probe-for-profiling",
       "r600-ir-structurize", "rdf-dump", "rdf-limit", "recip", "regalloc",
       "relax-elf-relocations", "remarks-section", "rewrite-map-file",
       "riscv-add-build-attributes", "riscv-use-aa", "rng-seed",
       "runtime-counter-relocation", "safepoint-ir-verifier-print-only",
       "sample-profile-check-record-coverage",
       "sample-profile-check-sample-coverage",
       "sample-profile-inline-hot-threshold",
-      "sample-profile-max-propagate-iterations", "shrink-wrap", "simplify-mir",
+      "sample-profile-max-propagate-iterations",
+      "sampled-instr-burst-duration", "sampled-instr-period",
+      "sampled-instrumentation", "save-temp-labels", "separate-named-sections",
+      "shrink-wrap", "simplify-mir",
       "skip-ret-exit-block",
       "speculative-counter-promotion-max-exiting",
       "speculative-counter-promotion-to-loop", "spiller", "spirv-debug",
-      "spirv-erase-cl-md", "spirv-lower-const-expr", "spirv-mem2reg",
+      "spirv-erase-cl-md", "spirv-ext", "spirv-lower-const-expr",
+      "spirv-mem2reg",
       "spirv-no-deref-attr", "spirv-text", "spirv-verify-regularize-passes",
       "split-machine-functions", "spv-dump-deps",
+      "spv-emit-nonsemantic-debug-info",
       "spv-lower-saddwithoverflow-validate", "spvbool-validate",
       "spvmemmove-validate", "stack-alignment", "stack-protector-guard",
       "stack-protector-guard-offset", "stack-protector-guard-reg",
@@ -923,21 +939,23 @@ void hideLLVMOptions() {
       "static-func-strip-dirname-prefix", "stats", "stats-json", "strict-dwarf",
       "strip-debug", "struct-path-tbaa", "summary-file", "sve-tail-folding",
       "swift-async-fp",
-      "tail-predication", "tailcallopt", "thinlto-assume-merged",
+      "tail-predication", "tailcallopt", "target-abi", "thinlto-assume-merged",
       "thread-model", "time-passes", "time-trace-granularity", "tls-size",
+      "translator-compatibility-mode",
       "type-based-intrinsic-cost", "unfold-element-atomic-memcpy-max-elements",
       "unique-basic-block-section-names", "unique-bb-section-names",
       "unique-section-names", "unit-at-a-time", "use-ctors",
       "vec-extabi", "verify-debug-info", "verify-dom-info",
       "verify-legalizer-debug-locs", "verify-loop-info",
       "verify-loop-lcssa", "verify-machine-dom-info", "verify-regalloc",
       "verify-region-info", "verify-scev", "verify-scev-maps",
-      "vp-counters-per-site", "vp-static-alloc",
-      "wasm-enable-eh", "wasm-enable-sjlj",
+      "vp-counters-per-site", "vp-static-alloc", "wasm-enable-eh",
+      "wasm-enable-exnref", "wasm-enable-sjlj", "wasm-use-legacy-eh",
+      "wholeprogramdevirt-cutoff", "write-experimental-debuginfo",
       "x86-align-branch", "x86-align-branch-boundary",
       "x86-branches-within-32B-boundaries", "x86-early-ifcvt",
-      "x86-pad-max-prefix-size",
-      "x86-recip-refinement-steps", "x86-use-vzeroupper",
+      "x86-pad-max-prefix-size", "x86-recip-refinement-steps",
+      "x86-relax-relocations", "x86-sse2avx", "x86-use-vzeroupper",
       "xcoff-traceback-table", "xray-function-index",
 
       // We enable -fdata-sections/-ffunction-sections by default where it makes

driver/cl_options_sanitizers.h

@@ -14,7 +14,11 @@
 #pragma once
 
 #include "driver/cl_helpers.h"
+#if LDC_LLVM_VER >= 2000
+#include "llvm/Transforms/Utils/Instrumentation.h"
+#else
 #include "llvm/Transforms/Instrumentation.h"
+#endif
 
 class FuncDeclaration;
 namespace llvm {

driver/linker-msvc.cpp

@@ -73,9 +73,18 @@ void addLibIfFound(std::vector<std::string> &args, const llvm::Twine &name) {
   }
 }
 
-void addSanitizerLibs(std::vector<std::string> &args) {
+void addSanitizerLibs(bool useInternalToolchain,
+                      std::vector<std::string> &args) {
   if (opts::isSanitizerEnabled(opts::AddressSanitizer)) {
     args.push_back("ldc_rt.asan.lib");
+#if LDC_LLVM_VER >= 2000 // extra library since LLVM 20
+    const bool linkStaticCRT =
+        getMscrtLibName(&useInternalToolchain).contains_lower("libcmt");
+    args.push_back((llvm::Twine("ldc_rt.asan_") +
+                    (linkStaticCRT ? "static" : "dynamic") +
+                    "_runtime_thunk.lib")
+                       .str());
+#endif
   } else if (opts::isSanitizerEnabled(opts::LeakSanitizer)) {
     // If ASan is enabled, it includes LSan. So only add LSan link flags if ASan is _not_ enabled already.
     args.push_back("ldc_rt.lsan.lib");
@@ -187,7 +196,7 @@ int linkObjToBinaryMSVC(llvm::StringRef outputPath,
 
   // LLVM compiler-rt libs
   addLibIfFound(args, "ldc_rt.builtins.lib");
-  addSanitizerLibs(args);
+  addSanitizerLibs(useInternalToolchain, args);
   if (opts::isInstrumentingForPGO()) {
     args.push_back("ldc_rt.profile.lib");
     // it depends on ws2_32 for symbol `gethostname`

driver/targetmachine.cpp

@@ -51,15 +51,18 @@
 #endif
 
 #ifdef LDC_LLVM_SUPPORTS_MACHO_DWARF_LINE_AS_REGULAR_SECTION
-// LDC-LLVM >= 6.0.1:
-// On Mac, emit __debug_line section in __DWARF segment as regular (non-debug)
-// section, like DMD, to enable file/line infos in backtraces. See
+// LDC-LLVM >= 20:
+// On Darwin, emit __debug_line section in __DWARF segment as regular
+// (non-debug) section, like DMD, to enable file/line infos in backtraces
+// without having to resort to an atos process. See
+// https://github.com/ldc-developers/ldc/issues/4895
 // https://github.com/dlang/dmd/commit/2bf7d0db29416eacbb01a91e6502140e354ee0ef
-// https://github.com/ldc-developers/llvm-project/commit/110deda1bc1cf195983fea8c1107886057987955
+// https://github.com/ldc-developers/llvm-project/commit/356e996bd217afd883adf3da5fe9a16c1102b273
 static llvm::cl::opt<bool, true> preserveDwarfLineSection(
     "preserve-dwarf-line-section",
-    llvm::cl::desc("Mac: preserve DWARF line section during linking for "
-                   "file/line infos in backtraces. Defaults to true."),
+    llvm::cl::desc("Darwin: preserve DWARF __debug_line section during linking "
+                   "for builtin file/line infos in backtraces without having "
+                   "to resort to an atos process."),
     llvm::cl::Hidden, llvm::cl::ZeroOrMore,
     llvm::cl::location(ldc::emitMachODwarfLineAsRegularSection),
     llvm::cl::init(false));

gen/abi/aarch64.cpp

@@ -130,7 +130,7 @@ struct AArch64TargetABI : TargetABI {
     // compiler magic: pass va_list args implicitly by reference
     if (!isReturnVal && isAAPCS64VaList(t)) {
       arg.byref = true;
-      arg.ltype = arg.ltype->getPointerTo();
+      arg.ltype = LLPointerType::getUnqual(arg.ltype);
       return;
     }
 

gen/classes.cpp

@@ -382,7 +382,7 @@ DValue *DtoDynamicCastObject(Loc loc, DValue *val, Type *_to) {
   // Object _d_dynamic_cast(Object o, ClassInfo c)
   llvm::Function *func =
       getRuntimeFunction(loc, gIR->module, "_d_dynamic_cast");
-  LLFunctionType *funcTy = func->getFunctionType();
+  [[maybe_unused]] LLFunctionType *funcTy = func->getFunctionType();
 
   // Object o
   LLValue *obj = DtoRVal(val);
@@ -483,7 +483,7 @@ DtoVirtualFunctionPointer(DValue *inst, FuncDeclaration *fdecl) {
   // get the vtbl for objects
   vtable = DtoGEP(irtc->getMemoryLLType(), vthis, 0u, 0);
   // load vtbl ptr
-  vtable = DtoLoad(vtblType->getPointerTo(), vtable);
+  vtable = DtoLoad(LLPointerType::getUnqual(vtblType), vtable);
   // index vtbl
   const std::string name = fdecl->toChars();
   const auto vtblname = name + "@vtbl";

gen/dcompute/druntime.h

@@ -41,7 +41,7 @@ struct DcomputePointer {
     int as = addrspace;
     if (translate)
       as = gIR->dcomputetarget->mapping[as];
-    return llType->getPointerTo(as);
+    return LLPointerType::get(llType, as);
   }
 };
 llvm::Optional<DcomputePointer> toDcomputePointer(StructDeclaration *sd);