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/* Distributed under the OSI-approved BSD 3-Clause License. See accompanying
file Copyright.txt or https://cmake.org/licensing for details. */
#include "cmGeneratorExpressionEvaluationFile.h"
#include "cmsys/FStream.hxx"
#include <memory> // IWYU pragma: keep
#include <sstream>
#include <utility>
#include "cmGeneratedFileStream.h"
#include "cmGlobalGenerator.h"
#include "cmListFileCache.h"
#include "cmLocalGenerator.h"
#include "cmMakefile.h"
#include "cmMessageType.h"
#include "cmSourceFile.h"
#include "cmSourceFileLocationKind.h"
#include "cmSystemTools.h"
cmGeneratorExpressionEvaluationFile::cmGeneratorExpressionEvaluationFile(
const std::string& input,
std::unique_ptr<cmCompiledGeneratorExpression> outputFileExpr,
std::unique_ptr<cmCompiledGeneratorExpression> condition,
bool inputIsContent, cmPolicies::PolicyStatus policyStatusCMP0070)
: Input(input)
, OutputFileExpr(std::move(outputFileExpr))
, Condition(std::move(condition))
, InputIsContent(inputIsContent)
, PolicyStatusCMP0070(policyStatusCMP0070)
{
}
void cmGeneratorExpressionEvaluationFile::Generate(
cmLocalGenerator* lg, const std::string& config, const std::string& lang,
cmCompiledGeneratorExpression* inputExpression,
std::map<std::string, std::string>& outputFiles, mode_t perm)
{
std::string rawCondition = this->Condition->GetInput();
if (!rawCondition.empty()) {
std::string condResult = this->Condition->Evaluate(
lg, config, false, nullptr, nullptr, nullptr, lang);
if (condResult == "0") {
return;
}
if (condResult != "1") {
std::ostringstream e;
e << "Evaluation file condition \"" << rawCondition
<< "\" did "
"not evaluate to valid content. Got \""
<< condResult << "\".";
lg->IssueMessage(MessageType::FATAL_ERROR, e.str());
return;
}
}
std::string outputFileName = this->OutputFileExpr->Evaluate(
lg, config, false, nullptr, nullptr, nullptr, lang);
const std::string& outputContent = inputExpression->Evaluate(
lg, config, false, nullptr, nullptr, nullptr, lang);
if (cmSystemTools::FileIsFullPath(outputFileName)) {
outputFileName = cmSystemTools::CollapseFullPath(outputFileName);
} else {
outputFileName = this->FixRelativePath(outputFileName, PathForOutput, lg);
}
std::map<std::string, std::string>::iterator it =
outputFiles.find(outputFileName);
if (it != outputFiles.end()) {
if (it->second == outputContent) {
return;
}
std::ostringstream e;
e << "Evaluation file to be written multiple times with different "
"content. "
"This is generally caused by the content evaluating the "
"configuration type, language, or location of object files:\n "
<< outputFileName;
lg->IssueMessage(MessageType::FATAL_ERROR, e.str());
return;
}
lg->GetMakefile()->AddCMakeOutputFile(outputFileName);
this->Files.push_back(outputFileName);
outputFiles[outputFileName] = outputContent;
cmGeneratedFileStream fout(outputFileName);
fout.SetCopyIfDifferent(true);
fout << outputContent;
if (fout.Close() && perm) {
cmSystemTools::SetPermissions(outputFileName.c_str(), perm);
}
}
void cmGeneratorExpressionEvaluationFile::CreateOutputFile(
cmLocalGenerator* lg, std::string const& config)
{
std::vector<std::string> enabledLanguages;
cmGlobalGenerator* gg = lg->GetGlobalGenerator();
gg->GetEnabledLanguages(enabledLanguages);
for (std::string const& le : enabledLanguages) {
std::string name = this->OutputFileExpr->Evaluate(
lg, config, false, nullptr, nullptr, nullptr, le);
cmSourceFile* sf = lg->GetMakefile()->GetOrCreateSource(
name, false, cmSourceFileLocationKind::Known);
// Tell TraceDependencies that the file is not expected to exist
// on disk yet. We generate it after that runs.
sf->SetProperty("GENERATED", "1");
// Tell the build system generators that there is no build rule
// to generate the file.
sf->SetProperty("__CMAKE_GENERATED_BY_CMAKE", "1");
gg->SetFilenameTargetDepends(
sf, this->OutputFileExpr->GetSourceSensitiveTargets());
}
}
void cmGeneratorExpressionEvaluationFile::Generate(cmLocalGenerator* lg)
{
mode_t perm = 0;
std::string inputContent;
if (this->InputIsContent) {
inputContent = this->Input;
} else {
std::string inputFileName = this->Input;
if (cmSystemTools::FileIsFullPath(inputFileName)) {
inputFileName = cmSystemTools::CollapseFullPath(inputFileName);
} else {
inputFileName = this->FixRelativePath(inputFileName, PathForInput, lg);
}
lg->GetMakefile()->AddCMakeDependFile(inputFileName);
cmSystemTools::GetPermissions(inputFileName.c_str(), perm);
cmsys::ifstream fin(inputFileName.c_str());
if (!fin) {
std::ostringstream e;
e << "Evaluation file \"" << inputFileName << "\" cannot be read.";
lg->IssueMessage(MessageType::FATAL_ERROR, e.str());
return;
}
std::string line;
std::string sep;
while (cmSystemTools::GetLineFromStream(fin, line)) {
inputContent += sep + line;
sep = "\n";
}
inputContent += sep;
}
cmListFileBacktrace lfbt = this->OutputFileExpr->GetBacktrace();
cmGeneratorExpression contentGE(lfbt);
std::unique_ptr<cmCompiledGeneratorExpression> inputExpression =
contentGE.Parse(inputContent);
std::map<std::string, std::string> outputFiles;
std::vector<std::string> allConfigs;
lg->GetMakefile()->GetConfigurations(allConfigs);
if (allConfigs.empty()) {
allConfigs.emplace_back();
}
std::vector<std::string> enabledLanguages;
cmGlobalGenerator* gg = lg->GetGlobalGenerator();
gg->GetEnabledLanguages(enabledLanguages);
for (std::string const& le : enabledLanguages) {
for (std::string const& li : allConfigs) {
this->Generate(lg, li, le, inputExpression.get(), outputFiles, perm);
if (cmSystemTools::GetFatalErrorOccured()) {
return;
}
}
}
}
std::string cmGeneratorExpressionEvaluationFile::FixRelativePath(
std::string const& relativePath, PathRole role, cmLocalGenerator* lg)
{
std::string resultPath;
switch (this->PolicyStatusCMP0070) {
case cmPolicies::WARN: {
std::string arg;
switch (role) {
case PathForInput:
arg = "INPUT";
break;
case PathForOutput:
arg = "OUTPUT";
break;
}
std::ostringstream w;
/* clang-format off */
w <<
cmPolicies::GetPolicyWarning(cmPolicies::CMP0070) << "\n"
"file(GENERATE) given relative " << arg << " path:\n"
" " << relativePath << "\n"
"This is not defined behavior unless CMP0070 is set to NEW. "
"For compatibility with older versions of CMake, the previous "
"undefined behavior will be used."
;
/* clang-format on */
lg->IssueMessage(MessageType::AUTHOR_WARNING, w.str());
}
CM_FALLTHROUGH;
case cmPolicies::OLD:
// OLD behavior is to use the relative path unchanged,
// which ends up being used relative to the working dir.
resultPath = relativePath;
break;
case cmPolicies::REQUIRED_IF_USED:
case cmPolicies::REQUIRED_ALWAYS:
case cmPolicies::NEW:
// NEW behavior is to interpret the relative path with respect
// to the current source or binary directory.
switch (role) {
case PathForInput:
resultPath = cmSystemTools::CollapseFullPath(
relativePath, lg->GetCurrentSourceDirectory());
break;
case PathForOutput:
resultPath = cmSystemTools::CollapseFullPath(
relativePath, lg->GetCurrentBinaryDirectory());
break;
}
break;
}
return resultPath;
}
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