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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 "cmIfCommand.h"
#include "cm_memory.hxx"
#include "cmConditionEvaluator.h"
#include "cmExecutionStatus.h"
#include "cmExpandedCommandArgument.h"
#include "cmFunctionBlocker.h"
#include "cmListFileCache.h"
#include "cmMakefile.h"
#include "cmMessageType.h"
#include "cmOutputConverter.h"
#include "cmSystemTools.h"
#include "cmake.h"
#include <string>
#include <utility>
static std::string cmIfCommandError(
std::vector<cmExpandedCommandArgument> const& args)
{
std::string err = "given arguments:\n ";
for (cmExpandedCommandArgument const& i : args) {
err += " ";
err += cmOutputConverter::EscapeForCMake(i.GetValue());
}
err += "\n";
return err;
}
class cmIfFunctionBlocker : public cmFunctionBlocker
{
public:
bool IsFunctionBlocked(const cmListFileFunction& lff, cmMakefile& mf,
cmExecutionStatus&) override;
bool ShouldRemove(const cmListFileFunction& lff, cmMakefile& mf) override;
bool Replay(std::vector<cmListFileFunction> const& functions,
cmExecutionStatus& inStatus);
std::vector<cmListFileArgument> Args;
std::vector<cmListFileFunction> Functions;
bool IsBlocking;
bool HasRun = false;
bool ElseSeen = false;
unsigned int ScopeDepth = 0;
};
//=========================================================================
bool cmIfFunctionBlocker::IsFunctionBlocked(const cmListFileFunction& lff,
cmMakefile& mf,
cmExecutionStatus& inStatus)
{
// we start by recording all the functions
if (lff.Name.Lower == "if") {
this->ScopeDepth++;
} else if (lff.Name.Lower == "endif") {
this->ScopeDepth--;
// if this is the endif for this if statement, then start executing
if (!this->ScopeDepth) {
// Remove the function blocker for this scope or bail.
std::unique_ptr<cmFunctionBlocker> fb(
mf.RemoveFunctionBlocker(this, lff));
if (!fb) {
return false;
}
return this->Replay(this->Functions, inStatus);
}
}
// record the command
this->Functions.push_back(lff);
// always return true
return true;
}
//=========================================================================
bool cmIfFunctionBlocker::ShouldRemove(const cmListFileFunction& lff,
cmMakefile&)
{
if (lff.Name.Lower == "endif") {
// if the endif has arguments, then make sure
// they match the arguments of the matching if
if (lff.Arguments.empty() || lff.Arguments == this->Args) {
return true;
}
}
return false;
}
bool cmIfFunctionBlocker::Replay(
std::vector<cmListFileFunction> const& functions,
cmExecutionStatus& inStatus)
{
cmMakefile& mf = inStatus.GetMakefile();
// execute the functions for the true parts of the if statement
cmExecutionStatus status(mf);
int scopeDepth = 0;
for (cmListFileFunction const& func : functions) {
// keep track of scope depth
if (func.Name.Lower == "if") {
scopeDepth++;
}
if (func.Name.Lower == "endif") {
scopeDepth--;
}
// watch for our state change
if (scopeDepth == 0 && func.Name.Lower == "else") {
if (this->ElseSeen) {
cmListFileBacktrace bt = mf.GetBacktrace(func);
mf.GetCMakeInstance()->IssueMessage(
MessageType::FATAL_ERROR,
"A duplicate ELSE command was found inside an IF block.", bt);
cmSystemTools::SetFatalErrorOccured();
return true;
}
this->IsBlocking = this->HasRun;
this->HasRun = true;
this->ElseSeen = true;
// if trace is enabled, print a (trivially) evaluated "else"
// statement
if (!this->IsBlocking && mf.GetCMakeInstance()->GetTrace()) {
mf.PrintCommandTrace(func);
}
} else if (scopeDepth == 0 && func.Name.Lower == "elseif") {
if (this->ElseSeen) {
cmListFileBacktrace bt = mf.GetBacktrace(func);
mf.GetCMakeInstance()->IssueMessage(
MessageType::FATAL_ERROR,
"An ELSEIF command was found after an ELSE command.", bt);
cmSystemTools::SetFatalErrorOccured();
return true;
}
if (this->HasRun) {
this->IsBlocking = true;
} else {
// if trace is enabled, print the evaluated "elseif" statement
if (mf.GetCMakeInstance()->GetTrace()) {
mf.PrintCommandTrace(func);
}
std::string errorString;
std::vector<cmExpandedCommandArgument> expandedArguments;
mf.ExpandArguments(func.Arguments, expandedArguments);
MessageType messType;
cmListFileContext conditionContext =
cmListFileContext::FromCommandContext(
func, this->GetStartingContext().FilePath);
cmConditionEvaluator conditionEvaluator(mf, conditionContext,
mf.GetBacktrace(func));
bool isTrue =
conditionEvaluator.IsTrue(expandedArguments, errorString, messType);
if (!errorString.empty()) {
std::string err = cmIfCommandError(expandedArguments);
err += errorString;
cmListFileBacktrace bt = mf.GetBacktrace(func);
mf.GetCMakeInstance()->IssueMessage(messType, err, bt);
if (messType == MessageType::FATAL_ERROR) {
cmSystemTools::SetFatalErrorOccured();
return true;
}
}
if (isTrue) {
this->IsBlocking = false;
this->HasRun = true;
}
}
}
// should we execute?
else if (!this->IsBlocking) {
status.Clear();
mf.ExecuteCommand(func, status);
if (status.GetReturnInvoked()) {
inStatus.SetReturnInvoked();
return true;
}
if (status.GetBreakInvoked()) {
inStatus.SetBreakInvoked();
return true;
}
if (status.GetContinueInvoked()) {
inStatus.SetContinueInvoked();
return true;
}
}
}
return true;
}
//=========================================================================
bool cmIfCommand(std::vector<cmListFileArgument> const& args,
cmExecutionStatus& inStatus)
{
cmMakefile& makefile = inStatus.GetMakefile();
std::string errorString;
std::vector<cmExpandedCommandArgument> expandedArguments;
makefile.ExpandArguments(args, expandedArguments);
MessageType status;
cmConditionEvaluator conditionEvaluator(
makefile, makefile.GetExecutionContext(), makefile.GetBacktrace());
bool isTrue =
conditionEvaluator.IsTrue(expandedArguments, errorString, status);
if (!errorString.empty()) {
std::string err = "if " + cmIfCommandError(expandedArguments);
err += errorString;
if (status == MessageType::FATAL_ERROR) {
makefile.IssueMessage(MessageType::FATAL_ERROR, err);
cmSystemTools::SetFatalErrorOccured();
return true;
}
makefile.IssueMessage(status, err);
}
{
auto fb = cm::make_unique<cmIfFunctionBlocker>();
// if is isn't true block the commands
fb->ScopeDepth = 1;
fb->IsBlocking = !isTrue;
if (isTrue) {
fb->HasRun = true;
}
fb->Args = args;
makefile.AddFunctionBlocker(std::move(fb));
}
return true;
}
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