# This procedure executes one line of a test case's execution script.
proc execOneLine { test PRS outcome lineno line } {
  set status 0
  set resultmsg ""
  set retval [ catch { eval exec -keepnewline -- $line } errmsg ]
  if { $retval != 0 } {
    set code [lindex $::errorCode 0]
    set lineno [expr $lineno + 1]
    if { $PRS != ""} {
      set PRS " for $PRS" 
    }
    set errmsg " at line $lineno\nwhile running: $line\n$errmsg"
    switch "$code" {
      CHILDSTATUS {
        set status [lindex $::errorCode 2]
        if { $status != 0 } {
          set resultmsg "$test$PRS\nFailed with exit($status)$errmsg"
        }
      }
      CHILDKILLED {
        set signal [lindex $::errorCode 2]
        set resultmsg "$test$PRS\nFailed with signal($signal)$errmsg"
      }
      CHILDSUSP {
        set signal [lindex $::errorCode 2]
        set resultmsg "$test$PRS\nFailed with suspend($signal)$errmsg"
      }
      POSIX {
        set posixNum [lindex $::errorCode 1]
        set posixMsg [lindex $::errorCode 2]
        set resultmsg "$test$PRS\nFailed with posix($posixNum,$posixMsg)$errmsg"
      }
      NONE {
        # Any other error such as stderr output of a program, or syntax error in
        # the RUN line.
        set resultmsg "$test$PRS\nFailed with unknown error (or has stderr output)$errmsg" 
      }
      default {
        set resultmsg "$test$PRS\nFailed with unknown error$errmsg" 
      }
    }
  } 
  return $resultmsg
}

# This procedure performs variable substitutions on the RUN: lines of a test
# cases.
proc substitute { line test tmpFile } {
  global srcroot objroot srcdir objdir subdir target_triplet prcontext 
  global llvmgcc llvmgxx llvmgcc_version llvmgccmajvers ocamlc
  global gccpath gxxpath compile_c compile_cxx link shlibext llvmlibsdir
  set path [file join $srcdir $subdir]

  # Substitute all Tcl variables.
  set new_line [subst $line ]

  #replace %prcontext with prcontext.tcl (Must replace before %p)
  regsub -all {%prcontext} $new_line $prcontext new_line
  #replace %llvmgcc with actual path to llvmgcc
  regsub -all {%llvmgcc} $new_line "$llvmgcc -emit-llvm -w" new_line
  #replace %llvmgxx with actual path to llvmg++
  regsub -all {%llvmgxx} $new_line "$llvmgxx -emit-llvm -w" new_line
  #replace %compile_cxx with C++ compilation command
  regsub -all {%compile_cxx} $new_line "$compile_cxx" new_line
  #replace %compile_c with C compilation command
  regsub -all {%compile_c} $new_line "$compile_c" new_line
  #replace %link with C++ link command
  regsub -all {%link} $new_line "$link" new_line
  #replace %shlibext with shared library extension
  regsub -all {%shlibext} $new_line "$shlibext" new_line
  #replace %ocamlc with ocaml compiler command
  regsub -all {%ocamlc} $new_line "$ocamlc" new_line
  #replace %llvmlibsdir with configure library directory
  regsub -all {%llvmlibsdir} $new_line "$llvmlibsdir" new_line
  #replace %p with path to source, 
  regsub -all {%p} $new_line [file join $srcdir $subdir] new_line
  #replace %s with filename
  regsub -all {%s} $new_line $test new_line
  #replace %t with temp filenames
  regsub -all {%t} $new_line $tmpFile new_line
  #replace %% with %
  regsub -all {%%} $new_line % new_line
  return $new_line
}

# This procedure runs the set of tests for the test_source_files array.
proc RunLLVMTests { test_source_files } {
  global srcroot objroot srcdir objdir subdir target_triplet llvmgcc_version
  set timeout 60

  set path [file join $objdir $subdir]
  
  #Make Output Directory if it does not exist already
  if { [file exists path] } {
    cd $path
  } else {
    file mkdir $path
    cd $path
  }
  
  file mkdir Output
  cd Output

  foreach test $test_source_files {
    #Should figure out best way to set the timeout
    #set timeout 40
    
    set filename [file tail $test]
    verbose "ABOUT TO RUN: $filename" 2
    set outcome PASS
    set tmpFile "$filename.tmp"
    
    # Mark that it should not be XFAIL for this target.
    set targetPASS 0
    
    #set hasRunline bool to check if testcase has a runline
    set numLines 0

    # Open the test file and start reading lines
    set testFileId [ open $test r]
    set runline ""
    set PRNUMS ""
    foreach line [split [read $testFileId] \n] {

      # if its the END. line then stop parsing (optimization for big files)
      if {[regexp {END.[[:space:]]*$} $line match endofscript]} {        
        break

      # if the line is continued, concatenate and continue the loop
      } elseif {[regexp {RUN: *(.+)(\\)$} $line match oneline suffix]} {
        set runline "$runline$oneline "

      # if its a terminating RUN: line then do substitution on the whole line
      # and then save the line. 
      } elseif {[regexp {RUN: *(.+)$} $line match oneline suffix]} {
        set runline "$runline$oneline"
        set runline [ substitute $runline $test $tmpFile ]
        set lines($numLines) $runline
        set numLines [expr $numLines + 1]
        set runline ""

      # if its an PR line, save the problem report number
      } elseif {[regexp {PR([0-9]+)} $line match prnum]} {
        if {$PRNUMS == ""} {
          set PRNUMS "PR$prnum"
        } else {
          set PRNUMS "$PRNUMS,$prnum"
        }
      # if its an XFAIL line, see if we should be XFAILing or not.
      } elseif {[regexp {XFAIL:[ *](.+)} $line match targets]} {
        set targets

        #split up target if more then 1 specified
        foreach target [split $targets ,] {
          if { [regexp {\*} $target match] } {
              if {$targetPASS != 1} {
                 set outcome XFAIL
              }
          } elseif { [regexp $target $target_triplet match] } {
              if {$targetPASS != 1} {
                 set outcome XFAIL
              }
          } elseif { [regexp {llvmgcc(([0-9]+)|([0-9]+[.][0-9]+))} $target match submatch submatch2]  } {
            if { [regexp ^($submatch)$|^(($submatch)(\.)) $llvmgcc_version match] } {
              if {$targetPASS != 1} {
                 set outcome XFAIL
              }
            }
          }
        }
      } elseif {[regexp {XTARGET:[ *](.+)} $line match targets]} {
        set targets

        #split up target if more then 1 specified
        foreach target [split $targets ,] {
          if { [regexp {\*} $target match] } {
              set targetPASS 1
              set outcome PASS
          } elseif { [regexp $target $target_triplet match] } {
              set targetPASS 1
              set outcome PASS
          } elseif { [regexp {llvmgcc(([0-9]+)|([0-9]+[.][0-9]+))} $target match submatch submatch2]  } {
            if { [regexp ^($submatch)$|^(($submatch)(\.)) $llvmgcc_version match] } {
              set targetPASS 1
              set outcome PASS
            }
          }
        }
      }
    }
    
    # Done reading the script
    close $testFileId
    
    
    if { $numLines == 0 } {
      fail "$test: \nDoes not have a RUN line\n"
    } else {
      set failed 0
      for { set i 0 } { $i < $numLines } { set i [ expr $i + 1 ] } {
        regsub ^.*RUN:(.*) $lines($i) \1 theLine
        set resultmsg [execOneLine $test $PRNUMS $outcome $i $theLine ]
        if { $resultmsg != "" } {
          if { $outcome == "XFAIL" } {
            xfail "$resultmsg"
          } else {
            fail "$resultmsg"
          }
          set failed 1
          break
        }
      }
      if { $failed } {
        continue
      } else {
        if { $PRNUMS != "" } {
          set PRNUMS " for $PRNUMS"
        }
        if { $outcome == "XFAIL" } {
          xpass "$test$PRNUMS"
        } else {
          pass "$test$PRNUMS"
        }
      }
    }
  }
}

# This procedure provides an interface to check the LLVMGCC_LANGS makefile
# variable to see if llvm-gcc supports compilation of a particular language.
proc llvm_gcc_supports { lang } {
  global llvmgcc llvmgcc_langs
  # validate the language choices and determine the name of the compiler
  # component responsible for determining if the compiler has been built.
  switch "$lang" {
    ada     { set file gnat1 }
    c       { set file cc1 }
    c++     { set file cc1plus }
    objc    { set file cc1obj }
    obj-c++ { set file cc1objplus }
    fortran { set file f951 }
    default { return 0 }
  }
  foreach supported_lang [split "$llvmgcc_langs" ,] {
    if { "$lang" == "$supported_lang" } {
      # FIXME: Knowing it is configured is not enough. We should do two more
      # checks here. First, we need to run llvm-gcc -print-prog-name=$file to 
      # get the path to the compiler. If we don't get a path, the language isn't
      # properly configured or built. If we do get a path, we should check to 
      # make sure that it is executable and perhaps even try executing it.
      return 1;
    }
  }
  return 0;
}

# This procedure provides an interface to check the TARGETS_TO_BUILD makefile
# variable to see if a particular target has been configured to build. This
# helps avoid running tests for targets that aren't available.
proc llvm_supports_target { tgtName } {
  global TARGETS_TO_BUILD
  foreach target [split $TARGETS_TO_BUILD] {
    if { [regexp $tgtName $target match] } {
      return 1
    }
  }
  return 0
}