cmGeneratorTarget: Factor transitive property methods into own source

1 files changed, 207 insertions, 0 deletions

diff --git a/Source/cmGeneratorTarget_TransitiveProperty.cxx b/Source/cmGeneratorTarget_TransitiveProperty.cxx
new file mode 100644
index 0000000..f5d9a1a
--- /dev/null
+++ b/Source/cmGeneratorTarget_TransitiveProperty.cxx
@@ -0,0 +1,207 @@
+/* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+   file Copyright.txt or https://cmake.org/licensing for details.  */
+/* clang-format off */
+#include "cmGeneratorTarget.h"
+/* clang-format on */
+
+#include <map>
+#include <string>
+#include <unordered_map>
+#include <utility>
+#include <vector>
+
+#include <cm/optional>
+#include <cm/string_view>
+#include <cmext/string_view>
+
+#include "cmGeneratorExpression.h"
+#include "cmGeneratorExpressionContext.h"
+#include "cmGeneratorExpressionDAGChecker.h"
+#include "cmGeneratorExpressionNode.h"
+#include "cmLinkItem.h"
+#include "cmLocalGenerator.h"
+#include "cmPolicies.h"
+#include "cmStringAlgorithms.h"
+#include "cmValue.h"
+
+namespace {
+using UseTo = cmGeneratorTarget::UseTo;
+using TransitiveProperty = cmGeneratorTarget::TransitiveProperty;
+}
+
+const std::map<cm::string_view, TransitiveProperty>
+  cmGeneratorTarget::BuiltinTransitiveProperties = {
+    { "AUTOMOC_MACRO_NAMES"_s,
+      { "INTERFACE_AUTOMOC_MACRO_NAMES"_s, UseTo::Compile } },
+    { "AUTOUIC_OPTIONS"_s, { "INTERFACE_AUTOUIC_OPTIONS"_s, UseTo::Compile } },
+    { "COMPILE_DEFINITIONS"_s,
+      { "INTERFACE_COMPILE_DEFINITIONS"_s, UseTo::Compile } },
+    { "COMPILE_FEATURES"_s,
+      { "INTERFACE_COMPILE_FEATURES"_s, UseTo::Compile } },
+    { "COMPILE_OPTIONS"_s, { "INTERFACE_COMPILE_OPTIONS"_s, UseTo::Compile } },
+    { "INCLUDE_DIRECTORIES"_s,
+      { "INTERFACE_INCLUDE_DIRECTORIES"_s, UseTo::Compile } },
+    { "LINK_DEPENDS"_s, { "INTERFACE_LINK_DEPENDS"_s, UseTo::Link } },
+    { "LINK_DIRECTORIES"_s, { "INTERFACE_LINK_DIRECTORIES"_s, UseTo::Link } },
+    { "LINK_OPTIONS"_s, { "INTERFACE_LINK_OPTIONS"_s, UseTo::Link } },
+    { "PRECOMPILE_HEADERS"_s,
+      { "INTERFACE_PRECOMPILE_HEADERS"_s, UseTo::Compile } },
+    { "SOURCES"_s, { "INTERFACE_SOURCES"_s, UseTo::Compile } },
+    { "SYSTEM_INCLUDE_DIRECTORIES"_s,
+      { "INTERFACE_SYSTEM_INCLUDE_DIRECTORIES"_s, UseTo::Compile } },
+  };
+
+bool cmGeneratorTarget::MaybeHaveInterfaceProperty(
+  std::string const& prop, cmGeneratorExpressionContext* context,
+  UseTo usage) const
+{
+  std::string const key = prop + '@' + context->Config;
+  auto i = this->MaybeInterfacePropertyExists.find(key);
+  if (i == this->MaybeInterfacePropertyExists.end()) {
+    // Insert an entry now in case there is a cycle.
+    i = this->MaybeInterfacePropertyExists.emplace(key, false).first;
+    bool& maybeInterfaceProp = i->second;
+
+    // If this target itself has a non-empty property value, we are done.
+    maybeInterfaceProp = cmNonempty(this->GetProperty(prop));
+
+    // Otherwise, recurse to interface dependencies.
+    if (!maybeInterfaceProp) {
+      cmGeneratorTarget const* headTarget =
+        context->HeadTarget ? context->HeadTarget : this;
+      if (cmLinkInterfaceLibraries const* iface =
+            this->GetLinkInterfaceLibraries(context->Config, headTarget,
+                                            usage)) {
+        if (iface->HadHeadSensitiveCondition) {
+          // With a different head target we may get to a library with
+          // this interface property.
+          maybeInterfaceProp = true;
+        } else {
+          // The transitive interface libraries do not depend on the
+          // head target, so we can follow them.
+          for (cmLinkItem const& lib : iface->Libraries) {
+            if (lib.Target &&
+                lib.Target->MaybeHaveInterfaceProperty(prop, context, usage)) {
+              maybeInterfaceProp = true;
+              break;
+            }
+          }
+        }
+      }
+    }
+  }
+  return i->second;
+}
+
+std::string cmGeneratorTarget::EvaluateInterfaceProperty(
+  std::string const& prop, cmGeneratorExpressionContext* context,
+  cmGeneratorExpressionDAGChecker* dagCheckerParent, UseTo usage) const
+{
+  std::string result;
+
+  // If the property does not appear transitively at all, we are done.
+  if (!this->MaybeHaveInterfaceProperty(prop, context, usage)) {
+    return result;
+  }
+
+  // Evaluate $<TARGET_PROPERTY:this,prop> as if it were compiled.  This is
+  // a subset of TargetPropertyNode::Evaluate without stringify/parse steps
+  // but sufficient for transitive interface properties.
+  cmGeneratorExpressionDAGChecker dagChecker(context->Backtrace, this, prop,
+                                             nullptr, dagCheckerParent,
+                                             this->LocalGenerator);
+  switch (dagChecker.Check()) {
+    case cmGeneratorExpressionDAGChecker::SELF_REFERENCE:
+      dagChecker.ReportError(
+        context, "$<TARGET_PROPERTY:" + this->GetName() + "," + prop + ">");
+      return result;
+    case cmGeneratorExpressionDAGChecker::CYCLIC_REFERENCE:
+      // No error. We just skip cyclic references.
+    case cmGeneratorExpressionDAGChecker::ALREADY_SEEN:
+      // No error. We have already seen this transitive property.
+      return result;
+    case cmGeneratorExpressionDAGChecker::DAG:
+      break;
+  }
+
+  cmGeneratorTarget const* headTarget =
+    context->HeadTarget ? context->HeadTarget : this;
+
+  if (cmValue p = this->GetProperty(prop)) {
+    result = cmGeneratorExpressionNode::EvaluateDependentExpression(
+      *p, context->LG, context, headTarget, &dagChecker, this);
+  }
+
+  if (cmLinkInterfaceLibraries const* iface =
+        this->GetLinkInterfaceLibraries(context->Config, headTarget, usage)) {
+    context->HadContextSensitiveCondition =
+      context->HadContextSensitiveCondition ||
+      iface->HadContextSensitiveCondition;
+    for (cmLinkItem const& lib : iface->Libraries) {
+      // Broken code can have a target in its own link interface.
+      // Don't follow such link interface entries so as not to create a
+      // self-referencing loop.
+      if (lib.Target && lib.Target != this) {
+        // Pretend $<TARGET_PROPERTY:lib.Target,prop> appeared in the
+        // above property and hand-evaluate it as if it were compiled.
+        // Create a context as cmCompiledGeneratorExpression::Evaluate does.
+        cmGeneratorExpressionContext libContext(
+          context->LG, context->Config, context->Quiet, headTarget, this,
+          context->EvaluateForBuildsystem, context->Backtrace,
+          context->Language);
+        std::string libResult = cmGeneratorExpression::StripEmptyListElements(
+          lib.Target->EvaluateInterfaceProperty(prop, &libContext, &dagChecker,
+                                                usage));
+        if (!libResult.empty()) {
+          if (result.empty()) {
+            result = std::move(libResult);
+          } else {
+            result.reserve(result.size() + 1 + libResult.size());
+            result += ";";
+            result += libResult;
+          }
+        }
+        context->HadContextSensitiveCondition =
+          context->HadContextSensitiveCondition ||
+          libContext.HadContextSensitiveCondition;
+        context->HadHeadSensitiveCondition =
+          context->HadHeadSensitiveCondition ||
+          libContext.HadHeadSensitiveCondition;
+      }
+    }
+  }
+
+  return result;
+}
+
+cm::optional<cmGeneratorTarget::TransitiveProperty>
+cmGeneratorTarget::IsTransitiveProperty(cm::string_view prop,
+                                        cmLocalGenerator const* lg) const
+{
+  cm::optional<TransitiveProperty> result;
+  static const cm::string_view kINTERFACE_ = "INTERFACE_"_s;
+  if (cmHasPrefix(prop, kINTERFACE_)) {
+    prop = prop.substr(kINTERFACE_.length());
+  }
+  auto i = BuiltinTransitiveProperties.find(prop);
+  if (i != BuiltinTransitiveProperties.end()) {
+    result = i->second;
+    if (result->Usage != cmGeneratorTarget::UseTo::Compile) {
+      cmPolicies::PolicyStatus cmp0166 =
+        lg->GetPolicyStatus(cmPolicies::CMP0166);
+      if ((cmp0166 == cmPolicies::WARN || cmp0166 == cmPolicies::OLD) &&
+          (prop == "LINK_DIRECTORIES"_s || prop == "LINK_DEPENDS"_s ||
+           prop == "LINK_OPTIONS"_s)) {
+        result->Usage = cmGeneratorTarget::UseTo::Compile;
+      }
+    }
+  } else if (cmHasLiteralPrefix(prop, "COMPILE_DEFINITIONS_")) {
+    cmPolicies::PolicyStatus cmp0043 =
+      lg->GetPolicyStatus(cmPolicies::CMP0043);
+    if (cmp0043 == cmPolicies::WARN || cmp0043 == cmPolicies::OLD) {
+      result = TransitiveProperty{ "INTERFACE_COMPILE_DEFINITIONS"_s,
+                                   UseTo::Compile };
+    }
+  }
+  return result;
+}