133-402: Turbo Pascal is a software development system that includes a compiler and an integrated development environment (IDE) for the programming language Pascal running on the operating systems CP/M , CP/M-86 , and MS-DOS . It was originally developed by Anders Hejlsberg at Borland , and was notable for its very fast compiling. Turbo Pascal, and the later but similar Turbo C , made Borland
266-533: A basic block , to whole procedures, or even the whole program. There is a trade-off between the granularity of the optimizations and the cost of compilation. For example, peephole optimizations are fast to perform during compilation but only affect a small local fragment of the code, and can be performed independently of the context in which the code fragment appears. In contrast, interprocedural optimization requires more compilation time and memory space, but enable optimizations that are only possible by considering
399-412: A concrete syntax tree (CST, parse tree) and then transforming it into an abstract syntax tree (AST, syntax tree). In some cases additional phases are used, notably line reconstruction and preprocessing, but these are rare. The main phases of the front end include the following: The middle end, also known as optimizer, performs optimizations on the intermediate representation in order to improve
532-425: A high-level programming language to a low-level programming language (e.g. assembly language , object code , or machine code ) to create an executable program. There are many different types of compilers which produce output in different useful forms. A cross-compiler produces code for a different CPU or operating system than the one on which the cross-compiler itself runs. A bootstrap compiler
665-466: A text editor ; the source code was then compiled into object code (often requiring multiple passes), and a linker combined object code with runtime libraries to produce an executable program. In the early IBM PC market (1981–1983) the major programming tool vendors all made compilers that worked in a similar fashion. For example, the Microsoft Pascal system consisted of two compiler passes and
798-514: A "Runtime Error 200" message. (the error code 200 had nothing to do with the CPU speed 200 MHz). This is caused because a loop runs to count the number of times it can iterate in a fixed time, as measured by the real-time clock . When Turbo Pascal was developed it ran on machines with CPUs running at 2.5 to 8 MHz, and little thought was given to the possibility of vastly higher speeds, so from about 200 MHz enough iterations can be run to overflow
931-453: A "chain and execute" system of dynamic linking for separately compiled objects, similar to the system widely used in BASIC. Also, the language had a statement to include separate source code in a program when necessary, and overlaying was supported from TP3, but, as with overlays, chained objects had to fit into the original (limited) program memory space. As computing and storage facilities advanced,
1064-422: A PDP-7 in B. Unics eventually became spelled Unix. Bell Labs started the development and expansion of C based on B and BCPL. The BCPL compiler had been transported to Multics by Bell Labs and BCPL was a preferred language at Bell Labs. Initially, a front-end program to Bell Labs' B compiler was used while a C compiler was developed. In 1971, a new PDP-11 provided the resource to define extensions to B and rewrite
1197-437: A Production Quality Compiler (PQC) from formal definitions of source language and the target. PQCC tried to extend the term compiler-compiler beyond the traditional meaning as a parser generator (e.g., Yacc ) without much success. PQCC might more properly be referred to as a compiler generator. PQCC research into code generation process sought to build a truly automatic compiler-writing system. The effort discovered and designed
1330-400: A common shaft. The first prototype was finished in 1915 with the aim of overcoming the power loss experienced by aircraft engines due to the decreased density of air at high altitudes. However, the prototype was not reliable and did not reach production. Another early patent for turbochargers was applied for in 1916 by French steam turbine inventor Auguste Rateau , for their intended use on
1463-405: A compiler up into small programs is a technique used by researchers interested in producing provably correct compilers. Proving the correctness of a set of small programs often requires less effort than proving the correctness of a larger, single, equivalent program. Regardless of the exact number of phases in the compiler design, the phases can be assigned to one of three stages. The stages include
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#17328693068501596-432: A component of an IDE (VADS, Eclipse, Ada Pro). The interrelationship and interdependence of technologies grew. The advent of web services promoted growth of web languages and scripting languages. Scripts trace back to the early days of Command Line Interfaces (CLI) where the user could enter commands to be executed by the system. User Shell concepts developed with languages to write shell programs. Early Windows designs offered
1729-425: A design by Scottish engineer Dugald Clerk . Then in 1885, Gottlieb Daimler patented the technique of using a gear-driven pump to force air into an internal combustion engine. The 1905 patent by Alfred Büchi , a Swiss engineer working at Sulzer is often considered the birth of the turbocharger. This patent was for a compound radial engine with an exhaust-driven axial flow turbine and compressor mounted on
1862-439: A final linking pass (which could take minutes on systems with only floppy disks for secondary storage, even though programs were very much smaller than they are today). This process was less resource-intensive than the later integrated development environment (IDE). Vendors of software development tools aimed their products at professional developers, and the price for these basic tools plus ancillary tools like profilers ran into
1995-608: A front end, a middle end, and a back end. This front/middle/back-end approach makes it possible to combine front ends for different languages with back ends for different CPUs while sharing the optimizations of the middle end. Practical examples of this approach are the GNU Compiler Collection , Clang ( LLVM -based C/C++ compiler), and the Amsterdam Compiler Kit , which have multiple front-ends, shared optimizations and multiple back-ends. The front end analyzes
2128-527: A grammar for the language, though in more complex cases these require manual modification. The lexical grammar and phrase grammar are usually context-free grammars , which simplifies analysis significantly, with context-sensitivity handled at the semantic analysis phase. The semantic analysis phase is generally more complex and written by hand, but can be partially or fully automated using attribute grammars . These phases themselves can be further broken down: lexing as scanning and evaluating, and parsing as building
2261-612: A leader in PC-based development tools. For versions 6 and 7 (the last two versions), both a lower-priced Turbo Pascal and more expensive Borland Pascal were produced; Borland Pascal was oriented more toward professional software development, with more libraries and standard library source code . The name Borland Pascal is also used more generically for Borland's dialect of the language Pascal, significantly different from Standard Pascal. Borland has released three old versions of Turbo Pascal free of charge because of their historical interest:
2394-405: A limiting factor in the peak power produced by the engine. Various technologies, as described in the following sections, are often aimed at combining the benefits of both small turbines and large turbines. Large diesel engines often use a single-stage axial inflow turbine instead of a radial turbine. A twin-scroll turbocharger uses two separate exhaust gas inlets, to make use of the pulses in
2527-487: A much greater processing speed. The manual notes that although source code for the Turbo Pascal's software real data types offering a range of 1E-63 to 1E+63 to 11 significant figures, these were incompatible at a binary level: as well as having a much larger range, the software reals took six bytes in memory and the 8087 ones were eight. Like version 1, version 2 for CP/M-80 only ran on Z80-based CP/M machines. Version 3
2660-566: A pioneering role with turbocharging engines as witnessed by Sulzer, Saurer and Brown, Boveri & Cie . Automobile manufacturers began research into turbocharged engines during the 1950s, however the problems of "turbo lag" and the bulky size of the turbocharger were not able to be solved at the time. The first turbocharged cars were the short-lived Chevrolet Corvair Monza and the Oldsmobile Jetfire , both introduced in 1962. Greater adoption of turbocharging in passenger cars began in
2793-432: A result, compilers were split up into smaller programs which each made a pass over the source (or some representation of it) performing some of the required analysis and translations. The ability to compile in a single pass has classically been seen as a benefit because it simplifies the job of writing a compiler and one-pass compilers generally perform compilations faster than multi-pass compilers . Thus, partly driven by
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#17328693068502926-431: A simple batch programming capability. The conventional transformation of these language used an interpreter. While not widely used, Bash and Batch compilers have been written. More recently sophisticated interpreted languages became part of the developers tool kit. Modern scripting languages include PHP, Python, Ruby and Lua. (Lua is widely used in game development.) All of these have interpreter and compiler support. "When
3059-786: A tool named TPPATCH or equivalent, or by loading a terminate-and-stay-resident program before running the faulty program. There are also patches to the TP7 compiler, thus if the Pascal source is available, a new compiling's code will work without the compiled code needing a patch. If the source code is available, porting to libraries without CPU clock speed dependency is a solution too. There were several floating point types, including single (the 4-byte [IEEE 754] representation) double (the 8-byte IEEE 754 representation), extended (a 10-byte IEEE 754 representation used mostly internally by numeric coprocessors ) and Real (a 6-byte representation). In
3192-443: Is Open64 , which is used by many organizations for research and commercial purposes. Due to the extra time and space needed for compiler analysis and optimizations, some compilers skip them by default. Users have to use compilation options to explicitly tell the compiler which optimizations should be enabled. The back end is responsible for the CPU architecture specific optimizations and for code generation . The main phases of
3325-608: Is also commercial support, for example, AdaCore, was founded in 1994 to provide commercial software solutions for Ada. GNAT Pro includes the GNU GCC based GNAT with a tool suite to provide an integrated development environment . High-level languages continued to drive compiler research and development. Focus areas included optimization and automatic code generation. Trends in programming languages and development environments influenced compiler technology. More compilers became included in language distributions (PERL, Java Development Kit) and as
3458-412: Is done with the use of adjustable vanes located inside the turbine housing between the inlet and turbine, which affect flow of gases towards the turbine. Some variable-geometry turbochargers use a rotary electric actuator to open and close the vanes, while others use a pneumatic actuator . If the turbine's aspect ratio is too large, the turbo will fail to create boost at low speeds; if the aspect ratio
3591-446: Is favored due to its modularity and separation of concerns . Most commonly, the frontend is broken into three phases: lexical analysis (also known as lexing or scanning), syntax analysis (also known as scanning or parsing), and semantic analysis . Lexing and parsing comprise the syntactic analysis (word syntax and phrase syntax, respectively), and in simple cases, these modules (the lexer and parser) can be automatically generated from
3724-470: Is increasing. The companies which manufacture the most turbochargers in Europe and the U.S. are Garrett Motion (formerly Honeywell), BorgWarner and Mitsubishi Turbocharger . Turbocharger failures and resultant high exhaust temperatures are among the causes of car fires. Failure of the seals will cause oil to leak into the cylinders causing blue-gray smoke. In diesel engines, this can cause an overspeed,
3857-441: Is no possibility of it being used at one location while it's being used at another." Borland sold about 250,000 copies of Turbo Pascal in two years, which Bruce F. Webster of Byte described as "an amazing figure for a computer language". He reported six months later that the figure had risen to "more than 400,000 copies in a marketplace that had been estimated as having only 30,000 potential buyers". Jerry Pournelle wrote in
3990-400: Is often a temporary compiler, used for compiling a more permanent or better optimised compiler for a language. Related software include decompilers , programs that translate from low-level languages to higher level ones; programs that translate between high-level languages, usually called source-to-source compilers or transpilers ; language rewriters , usually programs that translate
4123-538: Is that a turbocharger is powered by the kinetic energy of the exhaust gases, whereas a supercharger is mechanically powered (usually by a belt from the engine's crankshaft). However, up until the mid-20th century, a turbocharger was called a "turbosupercharger" and was considered a type of supercharger. Prior to the invention of the turbocharger, forced induction was only possible using mechanically-powered superchargers . Use of superchargers began in 1878, when several supercharged two-stroke gas engines were built using
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4256-670: Is that it's probably worth $ 149.95 . It looks to do everything MT+ with the Speed Programming Package does, and maybe even do it faster and better". Pournelle reported in July that, according to Kahn, IBM had refused to resell Turbo Pascal unless the price was at least $ 200 ; he noted that "Turbo is much better than the Pascal IBM sells", and unlike the latter was compatible with the IBM PCjr . Three Byte reviewers praised Turbo Pascal in
4389-402: Is that the optimum aspect ratio at low engine speeds is very different from that at high engine speeds. An electrically-assisted turbocharger combines a traditional exhaust-powered turbine with an electric motor, in order to reduce turbo lag. This differs from an electric supercharger , which solely uses an electric motor to power the compressor. The compressor draws in outside air through
4522-411: Is that the two nozzles are different sizes: the smaller nozzle is installed at a steeper angle and is used for low-rpm response, while the larger nozzle is less angled and optimised for times when high outputs are required. Variable-geometry turbochargers (also known as variable-nozzle turbochargers ) are used to alter the effective aspect ratio of the turbocharger as operating conditions change. This
4655-494: Is the classic "Hello, World!" program in Turbo Pascal: This asks for a name and writes it back to the screen a hundred times: While all versions of Turbo Pascal could include inline machine code , starting with version 6 it was possible to integrate assembly language within Pascal source code. Support for the various x86 memory models was provided by inline assembly, compiler options, and language extensions such as
4788-490: Is too small, the turbo will choke the engine at high speeds, leading to high exhaust manifold pressures, high pumping losses, and ultimately lower power output. By altering the geometry of the turbine housing as the engine accelerates, the turbo's aspect ratio can be maintained at its optimum. Because of this, variable-geometry turbochargers often have reduced lag, a lower boost threshold, and greater efficiency at higher engine speeds. The benefit of variable-geometry turbochargers
4921-441: Is unable to produce significant boost. At low rpm, the exhaust gas flow rate is unable to spin the turbine sufficiently. The boost threshold causes delays in the power delivery at low rpm (since the unboosted engine must accelerate the vehicle to increase the rpm above the boost threshold), while turbo lag causes delay in the power delivery at higher rpm. Some engines use multiple turbochargers, usually to reduce turbo lag, increase
5054-710: The Boeing B-17 Flying Fortress in 1938, which used turbochargers produced by General Electric. Other early turbocharged airplanes included the Consolidated B-24 Liberator , Lockheed P-38 Lightning , Republic P-47 Thunderbolt and experimental variants of the Focke-Wulf Fw 190 . The first practical application for trucks was realized by Swiss truck manufacturing company Saurer in the 1930s. BXD and BZD engines were manufactured with optional turbocharging from 1931 onwards. The Swiss industry played
5187-467: The United States market, Turbo Pascal retailed for US$ 49.99 , a very low price for a compiler at the time. The integrated Pascal compiler was of good quality compared to other Pascal products of the time. The Turbo name alluded to the speed of compiling and of the executables produced. The edit/compile/run cycle was fast compared to other Pascal implementations because everything related to building
5320-413: The crankshaft ) whereas a turbocharger is powered by the kinetic energy of the engine's exhaust gas . A turbocharger does not place a direct mechanical load on the engine, although turbochargers place exhaust back pressure on engines, increasing pumping losses. Supercharged engines are common in applications where throttle response is a key concern, and supercharged engines are less likely to heat soak
5453-420: The record type already present in Pascal. Several versions of Turbo Pascal, including the last version 7, include a unit named CRT, which was used by many fullscreen text-mode applications on a CRT . This unit contains code in its initialization section to determine the CPU speed and calibrate delay loops. This code fails on processors with a speed greater than about 200 MHz and aborts immediately with
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5586-679: The "absolute" keyword. The Turbo Assembler , TASM, a standard x86 assembler independent of TP, and source-compatible with the widely used Microsoft Macro Assembler MASM, was supplied with the enhanced "Borland Pascal" versions. The IDE provided several debugging facilities, including single stepping , examination and changing of variables, and conditional breakpoints. In later versions assembly-language blocks could be stepped through. The user could add breakpoints on variables and registers in an IDE window. Programs using IBM PC graphics mode could flip between graphics and text mode automatically or manually, or display both on two screens. For cases where
5719-570: The (since 1995, object-oriented) programming language Ada . The Ada STONEMAN document formalized the program support environment (APSE) along with the kernel (KAPSE) and minimal (MAPSE). An Ada interpreter NYU/ED supported development and standardization efforts with the American National Standards Institute (ANSI) and the International Standards Organization (ISO). Initial Ada compiler development by
5852-416: The 16-bit counter. A patch was produced when machines became too fast for the original method, but failed as processor speeds increased yet further, and was superseded by others. Programs subject to this error can be recompiled from source code with a compiler patched to eliminate the error (using a TURBO.TPL compiled with a corrected CRT unit) or, if source code is unavailable, executables can be patched by
5985-414: The 1980s, as a way to increase the performance of smaller displacement engines. Like other forced induction devices, a compressor in the turbocharger pressurises the intake air before it enters the inlet manifold . In the case of a turbocharger, the compressor is powered by the kinetic energy of the engine's exhaust gases, which is extracted by the turbocharger's turbine . The main components of
6118-576: The Early PL/I (EPL) compiler by Doug McIlory and Bob Morris from Bell Labs. EPL supported the project until a boot-strapping compiler for the full PL/I could be developed. Bell Labs left the Multics project in 1969, and developed a system programming language B based on BCPL concepts, written by Dennis Ritchie and Ken Thompson . Ritchie created a boot-strapping compiler for B and wrote Unics (Uniplexed Information and Computing Service) operating system for
6251-453: The IBM PC were limited to 640 KB). The Turbo Pascal IDE was very advanced for its day. It was able to perform well and compile very fast with the amount of RAM on a typical home computer. The IDE was simple and intuitive to use, and had a well-organized system of menus. Early versions of the editor used WordStar key functions, which was the de facto standard at the time. Later versions of
6384-477: The IDE unless the advanced debugging facilities of Turbopower T-Debug, and later TD, were required. Later versions also supported remote debugging via an RS-232 communication cable. Over the years, Borland enhanced not only the IDE, but also extended the programming language. A development system based on ISO standard Pascal requires implementation-specific extensions for the development of real-world applications on
6517-417: The IDE, and DOS .COM files were limited to 64 KB each of code, stack and global (static) variables. Program source code could be extended by using the include facility if the source code exceeded the memory limit of the editor. There were different versions of Turbo Pascal for computers running DOS, CP/M, or CP/M-86 with 64 KB of memory and at least one floppy disk drive. The CP/M version could run on
6650-472: The IDE, designed for PCs with more disk space and memory, could display the definitions of the keywords of the language by putting the cursor over a keyword and pressing the F1 key (conventionally used to display help). Many definitions included example code. In addition to standard executable programs, the compiler could generate terminate-and-stay-resident (TSR) programs, small utilities that stayed in memory and let
6783-527: The Renault engines used by French fighter planes. Separately, testing in 1917 by the National Advisory Committee for Aeronautics (NACA) and Sanford Alexander Moss showed that a turbocharger could enable an engine to avoid any power loss (compared with the power produced at sea level) at an altitude of up to 4,250 m (13,944 ft) above sea level. The testing was conducted at Pikes Peak in
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#17328693068506916-518: The Sun 3/60 Solaris targeted to Motorola 68020 in an Army CECOM evaluation. There were soon many Ada compilers available that passed the Ada Validation tests. The Free Software Foundation GNU project developed the GNU Compiler Collection (GCC) which provides a core capability to support multiple languages and targets. The Ada version GNAT is one of the most widely used Ada compilers. GNAT is free but there
7049-539: The Turbo Pascal compiler and the first three versions of Borland Delphi . The compiler was first released as Compas Pascal for CP/M , and then released on 20 November 1983 as Turbo Pascal for CP/M (including the Apple II fitted with a Z-80 SoftCard , effectively converting the 6502 -based Apple into a CP/M machine, the Commodore 64 with CP/M cartridge, and the later DEC Rainbow ), CP/M-86, and DOS machines. On its launch in
7182-640: The U.S. Military Services included the compilers in a complete integrated design environment along the lines of the STONEMAN document. Army and Navy worked on the Ada Language System (ALS) project targeted to DEC/VAX architecture while the Air Force started on the Ada Integrated Environment (AIE) targeted to IBM 370 series. While the projects did not provide the desired results, they did contribute to
7315-744: The United States using the Liberty L-12 aircraft engine. The first commercial application of a turbocharger was in June 1924 when the first heavy duty turbocharger, model VT402, was delivered from the Baden works of Brown, Boveri & Cie , under the supervision of Alfred Büchi, to SLM, Swiss Locomotive and Machine Works in Winterthur. This was followed very closely in 1925, when Alfred Büchi successfully installed turbochargers on ten-cylinder diesel engines, increasing
7448-465: The University of Cambridge was originally developed as a compiler writing tool. Several compilers have been implemented, Richards' book provides insights to the language and its compiler. BCPL was not only an influential systems programming language that is still used in research but also provided a basis for the design of B and C languages. BLISS (Basic Language for Implementation of System Software)
7581-409: The ability to generate large EXE files was added to Turbo Pascal, with the ability to statically link and collectively load separately compiled objects. The .TPU files output by compiling a Turbo Pascal unit are tightly linked to the internal structures of the compiler, rather than standard .OBJ linkable files. This improved compiling and linking times, but meant that .TPU files could not be linked with
7714-404: The back end include the following: Turbo In an internal combustion engine , a turbocharger (also known as a turbo or a turbosupercharger ) is a forced induction device that is powered by the flow of exhaust gases. It uses this energy to compress the intake air, forcing more air into the engine in order to produce more power for a given displacement . The current categorisation
7847-435: The basis of digital modern computing development during World War II. Primitive binary languages evolved because digital devices only understand ones and zeros and the circuit patterns in the underlying machine architecture. In the late 1940s, assembly languages were created to offer a more workable abstraction of the computer architectures. Limited memory capacity of early computers led to substantial technical challenges when
7980-433: The behavior of multiple functions simultaneously. Interprocedural analysis and optimizations are common in modern commercial compilers from HP , IBM , SGI , Intel , Microsoft , and Sun Microsystems . The free software GCC was criticized for a long time for lacking powerful interprocedural optimizations, but it is changing in this respect. Another open source compiler with full analysis and optimization infrastructure
8113-461: The best software value I have ever purchased", while a third said that Borland "deserves praise for" the "high-value" CP/M version. Pournelle in August 1985 called version 3.0 "a distinct improvement on the already impressive version 2" and said that the new book license "seems quite fair to me". He said that "Turbo Pascal has got to be the best value in languages on the market today", and that Borland led
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#17328693068508246-584: The compiler. By 1973 the design of C language was essentially complete and the Unix kernel for a PDP-11 was rewritten in C. Steve Johnson started development of Portable C Compiler (PCC) to support retargeting of C compilers to new machines. Object-oriented programming (OOP) offered some interesting possibilities for application development and maintenance. OOP concepts go further back but were part of LISP and Simula language science. Bell Labs became interested in OOP with
8379-449: The compressor blades. Ported shroud designs can have greater resistance to compressor surge and can improve the efficiency of the compressor wheel. The center hub rotating assembly (CHRA) houses the shaft that connects the turbine to the compressor. A lighter shaft can help reduce turbo lag. The CHRA also contains a bearing to allow this shaft to rotate at high speeds with minimal friction. Some CHRAs are water-cooled and have pipes for
8512-402: The computer do other tasks—running several programs at the same time, multitasking , was not otherwise available. Borland produced a small application suite called Sidekick that was a TSR letting the user keep a diary, notes, and so forth. Version 2, released a few months later on 17 April 1984, was an incremental improvement to the original Turbo Pascal, to the point that the reference manual
8645-594: The default blue colour scheme that would also be used on later Borland Turbo products. Other changes to IDE include the addition context-sensitive help with description of all built-in functions, and the ability to copy code fragments from the help to edit window. Version 6 was released on 23 October 1990. Changes from 5.5 include: the addition of inline assembly, the addition of the Turbo Vision library, mouse support, clipboard for text manipulations, multiple document interface supporting up to nine edit windows. Version 7
8778-407: The development of C++ . C++ was first used in 1980 for systems programming. The initial design leveraged C language systems programming capabilities with Simula concepts. Object-oriented facilities were added in 1983. The Cfront program implemented a C++ front-end for C84 language compiler. In subsequent years several C++ compilers were developed as C++ popularity grew. In many application domains,
8911-546: The development of compiler technology: Early operating systems and software were written in assembly language. In the 1960s and early 1970s, the use of high-level languages for system programming was still controversial due to resource limitations. However, several research and industry efforts began the shift toward high-level systems programming languages, for example, BCPL , BLISS , B , and C . BCPL (Basic Combined Programming Language) designed in 1966 by Martin Richards at
9044-424: The development of high-level languages followed naturally from the capabilities offered by digital computers. High-level languages are formal languages that are strictly defined by their syntax and semantics which form the high-level language architecture. Elements of these formal languages include: The sentences in a language may be defined by a set of rules called a grammar. Backus–Naur form (BNF) describes
9177-661: The early days, Real was the most popular. Most PCs of the era did not have a floating-point coprocessor so all floating-point arithmetic had to be done in software. Borland's own floating-point algorithms on Real were quicker than using the other types, though its library also emulated the other types in software. Version 1, released on 20 November 1983, was a basic all-in-one system, working in memory and producing .COM executable files for DOS and CP/M, and equivalent .CMD executables for CP/M-86 (totally different from .CMD batch files later used in 32-bit Microsoft Windows). Source code files were limited to 64 KB to simplify
9310-424: The early days, the approach taken to compiler design was directly affected by the complexity of the computer language to be processed, the experience of the person(s) designing it, and the resources available. Resource limitations led to the need to pass through the source code more than once. A compiler for a relatively simple language written by one person might be a single, monolithic piece of software. However, as
9443-403: The engine rpm is within the turbocharger's operating range – that occurs between pressing the throttle and the turbocharger spooling up to provide boost pressure. This delay is due to the increasing exhaust gas flow (after the throttle is suddenly opened) taking time to spin up the turbine to speeds where boost is produced. The effect of turbo lag is reduced throttle response , in
9576-559: The engine's coolant to flow through. One reason for water cooling is to protect the turbocharger's lubricating oil from overheating. The simplest type of turbocharger is the free floating turbocharger. This system would be able to achieve maximum boost at maximum engine revs and full throttle, however additional components are needed to produce an engine that is driveable in a range of load and rpm conditions. Additional components that are commonly used in conjunction with turbochargers are: Turbo lag refers to delay – when
9709-418: The engine's intake system, pressurises it, then feeds it into the combustion chambers (via the inlet manifold ). The compressor section of the turbocharger consists of an impeller, a diffuser, and a volute housing. The operating characteristics of a compressor are described by the compressor map . Some turbochargers use a "ported shroud", whereby a ring of holes or circular grooves allows air to bleed around
9842-491: The field of compiling began in the late 50s, its focus was limited to the translation of high-level language programs into machine code ... The compiler field is increasingly intertwined with other disciplines including computer architecture, programming languages, formal methods, software engineering, and computer security." The "Compiler Research: The Next 50 Years" article noted the importance of object-oriented languages and Java. Security and parallel computing were cited among
9975-461: The first (algorithmic) programming language for computers called Plankalkül ("Plan Calculus"). Zuse also envisioned a Planfertigungsgerät ("Plan assembly device") to automatically translate the mathematical formulation of a program into machine-readable punched film stock . While no actual implementation occurred until the 1970s, it presented concepts later seen in APL designed by Ken Iverson in
10108-423: The first compilers were designed. Therefore, the compilation process needed to be divided into several small programs. The front end programs produce the analysis products used by the back end programs to generate target code. As computer technology provided more resources, compiler designs could align better with the compilation process. It is usually more productive for a programmer to use a high-level language, so
10241-559: The first pass needs to gather information about declarations appearing after statements that they affect, with the actual translation happening during a subsequent pass. The disadvantage of compiling in a single pass is that it is not possible to perform many of the sophisticated optimizations needed to generate high quality code. It can be difficult to count exactly how many passes an optimizing compiler makes. For instance, different phases of optimization may analyse one expression many times but only analyse another expression once. Splitting
10374-410: The flow of exhaust gases to mechanical energy of a rotating shaft (which is used to power the compressor section). The turbine housings direct the gas flow through the turbine section, and the turbine itself can spin at speeds of up to 250,000 rpm. Some turbocharger designs are available with multiple turbine housing options, allowing a housing to be selected to best suit the engine's characteristics and
10507-400: The flow of the exhaust gasses from each cylinder. In a standard (single-scroll) turbocharger, the exhaust gas from all cylinders is combined and enters the turbocharger via a single intake, which causes the gas pulses from each cylinder to interfere with each other. For a twin-scroll turbocharger, the cylinders are split into two groups in order to maximize the pulses. The exhaust manifold keeps
10640-933: The form of expressions without a change of language; and compiler-compilers , compilers that produce compilers (or parts of them), often in a generic and reusable way so as to be able to produce many differing compilers. A compiler is likely to perform some or all of the following operations, often called phases: preprocessing , lexical analysis , parsing , semantic analysis ( syntax-directed translation ), conversion of input programs to an intermediate representation , code optimization and machine specific code generation . Compilers generally implement these phases as modular components, promoting efficient design and correctness of transformations of source input to target output. Program faults caused by incorrect compiler behavior can be very difficult to track down and work around; therefore, compiler implementers invest significant effort to ensure compiler correctness . Compilers are not
10773-404: The form of a delay in the power delivery. Superchargers do not suffer from turbo lag because the compressor mechanism is driven directly by the engine. Methods to reduce turbo lag include: A similar phenomenon that is often mistaken for turbo lag is the boost threshold . This is where the engine speed (rpm) is currently below the operating range of the turbocharger system, therefore the engine
10906-454: The future research targets. A compiler implements a formal transformation from a high-level source program to a low-level target program. Compiler design can define an end-to-end solution or tackle a defined subset that interfaces with other compilation tools e.g. preprocessors, assemblers, linkers. Design requirements include rigorously defined interfaces both internally between compiler components and externally between supporting toolsets. In
11039-410: The gases from these two groups of cylinders separated, then they travel through two separate spiral chambers ("scrolls") before entering the turbine housing via two separate nozzles. The scavenging effect of these gas pulses recovers more energy from the exhaust gases, minimizes parasitic back losses and improves responsiveness at low engine speeds. Another common feature of twin-scroll turbochargers
11172-528: The hundreds of dollars. Kahn's idea was to package all these functions in an integrated programming toolkit designed to have much better performance and resource utilization than the usual professional development tools, and charge a low price for a package integrating a custom text editor, compiler, and all functionality needed to produce executable programs. The program was sold by direct mail order for US$ 49.95 , without going through established sales channels (retailers or resellers). The Turbo Pascal compiler
11305-421: The idea of using a higher-level language quickly caught on. Because of the expanding functionality supported by newer programming languages and the increasing complexity of computer architectures, compilers became more complex. DARPA (Defense Advanced Research Projects Agency) sponsored a compiler project with Wulf's CMU research team in 1970. The Production Quality Compiler-Compiler PQCC design would produce
11438-505: The industry in "delivering excellent products at reasonable costs". Despite finding what the magazine called "a serious bug" in 3.0, and decreased compatibility with PC clones , Byte in February 1986 stated that "it is hard to avoid recommending Turbo to anyone who wants to program in Pascal", citing improved speed and graphic routines. When reviewing four other Pascal compilers in December 1986,
11571-499: The intake air. A combination of an exhaust-driven turbocharger and an engine-driven supercharger can mitigate the weaknesses of both. This technique is called twincharging . Turbochargers have been used in the following applications: In 2017, 27% of vehicles sold in the US were turbocharged. In Europe 67% of all vehicles were turbocharged in 2014. Historically, more than 90% of turbochargers were diesel, however, adoption in petrol engines
11704-580: The language, stating in August 1985 that Turbo Pascal "is best known for its small size, incredible compile speeds, and fast execution times". He noted that the software's quality and low price was especially surprising after the " JRT Pascal fiasco", and stated that even at the new higher $ 69.95 price, version 3.0 was "probably still the best software deal on the market". PC Magazine was similarly complimentary in November 1984, stating that "nothing like Turbo Pascal has ever existed for PC-DOS before". It praised
11837-434: The late 1950s. APL is a language for mathematical computations. Between 1949 and 1951, Heinz Rutishauser proposed Superplan , a high-level language and automatic translator. His ideas were later refined by Friedrich L. Bauer and Klaus Samelson . High-level language design during the formative years of digital computing provided useful programming tools for a variety of applications: Compiler technology evolved from
11970-510: The magazine described Turbo Pascal as "practical and attractive to programmers at all levels of expertise". Besides allowing applications larger than 64 KB, Byte in 1988 reported substantially faster compiling and executing for version 4.0, and that that although it did not maintain previous versions' "almost total" backward compatibility, conversion was fast and easy. The reviewer concluded, "I highly recommend Turbo Pascal 4.0 as an addition to any programmer's software repertoire". Webster praised
12103-420: The magazine in February 1984 that Turbo Pascal "comes close to what I think the computer industry is headed for: well documented, standard, plenty of good features, and a reasonable price". He disliked the requirement to buy another license to distribute binaries, but noted that "it turns out not to be a lot more. Borland only wants another $ 100 " atop the $ 49.95 base price, and that "my first impression of Turbo
12236-456: The magazine stated that "for rapid prototyping there's not much better". In the same issue Pournelle again praised version 4.0 and 5.0 of Turbo Pascal. Citing Anacreon as "a good example of how complex a program you can write in Pascal", and the many libraries from Borland and other developers, he wrote "I think it may well be the language for the rest of us". Scott MacGregor of Microsoft said that Bill Gates "couldn't understand why our stuff
12369-503: The many CP/M machines of the time with Z80 processors, or an Apple II with Z80 card. The DOS and CP/M-86 versions ran on the many 8086 and 8088 machines which became available, including the IBM PC. The installer, lister, and compiler with its IDE, and the source code for a simple spreadsheet program called MicroCalc written by Philippe Kahn as a demonstration, would fit on a single floppy disc. A disc copy without MicroCalc would accommodate
12502-409: The modules easily. Borland called its language Object Pascal , which was greatly extended to become the language underlying Delphi (which has two separate OOP systems). The name "Object Pascal" originated with the Pascal extensions developed by Apple Computer to program its Lisa and Macintosh computers. Pascal originator Niklaus Wirth consulted in developing these extensions, which built upon
12635-431: The more portable Pascal enhancements of the earlier products (i.e., those not specific to 16-bit code) including the earlier static object model. This language backwards compatibility means much old Turbo Pascal code can still be compiled and run in a modern environment today. Other suppliers have produced software development tools compatible with Turbo Pascal. The best-known are Free Pascal and Virtual Pascal . This
12768-408: The need for a strictly defined transformation of the high-level source program into a low-level target program for the digital computer. The compiler could be viewed as a front end to deal with the analysis of the source code and a back end to synthesize the analysis into the target code. Optimization between the front end and back end could produce more efficient target code. Some early milestones in
12901-643: The new 80386 processor. TD was usually supplied in conjunction with the Turbo Assembler and the Turbo Profiler, a code profiler that reported on the time spent in each part of the program to assist program optimisation by finding bottlenecks. The books included with Borland Pascal had detailed descriptions of the Intel assembler language, including the number of clock cycles required by each instruction. Development and debugging could be carried out entirely within
13034-497: The numeric keypad on the IBM PC and compatibles. Such PCs also had new text window and CGA graphics mode commands as well as being able to use the PC's speaker for tones. Finally, DOS and CP/M-86 machines with an 8087 maths coprocessor (or later compatible) had an alternative TURBO-87 compiler available to purchase. It supported the 8087's long real data types with a range of 1.67E-307 to 1.67E+308 to 14 significant figure precision but with
13167-616: The object files used in other languages such as FORTRAN or C. For example, the line uses crt; in a program included the unit called crt; the uses is the mechanism for using other compiling units. interface and implementation were the keywords used to specify, within the unit, what was (and what was not) visible outside the unit. This is similar to the public and private keywords in other languages such as C++ and Java . Units in Borland's Pascal were similar to Modula-2 's separate compiling system. In 1987, when Turbo Pascal 4
13300-570: The only language processor used to transform source programs. An interpreter is computer software that transforms and then executes the indicated operations. The translation process influences the design of computer languages, which leads to a preference of compilation or interpretation. In theory, a programming language can have both a compiler and an interpreter. In practice, programming languages tend to be associated with just one (a compiler or an interpreter). Theoretical computing concepts developed by scientists, mathematicians, and engineers formed
13433-460: The original Turbo Pascal (now known as 1.0), and versions 3.02 and 5.5 for DOS, while Borland's French office released version 7.01 on its FTP. Philippe Kahn first saw an opportunity for Borland, his newly formed software company, in the field of programming tools. Historically, the vast majority of programmers saw their workflow in terms of the edit/compile/link cycle, with separate tools dedicated to each task. Programmers wrote source code using
13566-399: The output of other languages or even used with different releases of Turbo Pascal unless recompiled from source. From version 5.5 some object-oriented programming features were introduced: classes , inheritance , constructors and destructors . The IDE was already augmented with an object browser interface showing relations between objects and methods and allowing programmers to navigate
13699-641: The overall effort on Ada development. Other Ada compiler efforts got underway in Britain at the University of York and in Germany at the University of Karlsruhe. In the U. S., Verdix (later acquired by Rational) delivered the Verdix Ada Development System (VADS) to the Army. VADS provided a set of development tools including a compiler. Unix/VADS could be hosted on a variety of Unix platforms such as DEC Ultrix and
13832-511: The performance and the quality of the produced machine code. The middle end contains those optimizations that are independent of the CPU architecture being targeted. The main phases of the middle end include the following: Compiler analysis is the prerequisite for any compiler optimization, and they tightly work together. For example, dependence analysis is crucial for loop transformation . The scope of compiler analysis and optimizations vary greatly; their scope may range from operating within
13965-407: The performance requirements. A turbocharger's performance is closely tied to its size, and the relative sizes of the turbine wheel and the compressor wheel. Large turbines typically require higher exhaust gas flow rates, therefore increasing turbo lag and increasing the boost threshold. Small turbines can produce boost quickly and at lower flow rates, since it has lower rotational inertia, but can be
14098-639: The phase structure of the PQC. The BLISS-11 compiler provided the initial structure. The phases included analyses (front end), intermediate translation to virtual machine (middle end), and translation to the target (back end). TCOL was developed for the PQCC research to handle language specific constructs in the intermediate representation. Variations of TCOL supported various languages. The PQCC project investigated techniques of automated compiler construction. The design concepts proved useful in optimizing compilers and compilers for
14231-415: The platforms they target. Standard Pascal is designed to be platform-independent, so prescribes no low-level access to hardware- or operating system-dependent facilities. Standard Pascal also does not prescribe how a large program should be split into separate compiling units. From version 4, Turbo Pascal adopted the concept of units from UCSD Pascal . Units were used as external function libraries, like
14364-548: The power output from 1,300 to 1,860 kilowatts (1,750 to 2,500 hp). This engine was used by the German Ministry of Transport for two large passenger ships called the Preussen and Hansestadt Danzig . The design was licensed to several manufacturers and turbochargers began to be used in marine, railcar and large stationary applications. Turbochargers were used on several aircraft engines during World War II, beginning with
14497-513: The program was stored in RAM, and because it was a one-pass compiler written in assembly language . Compiling was much faster than compilers for other languages (even Borland's own later compilers for C), and other Pascal compilers, and programmer time was also saved since the program could be compiled and run from the IDE. The execution speed of these COM -format programs was a revelation for developers whose only prior experience programming microcomputers
14630-399: The range of rpm where boost is produced, or simplify the layout of the intake/exhaust system. The most common arrangement is twin turbochargers, however triple-turbo or quad-turbo arrangements have been occasionally used in production cars. The key difference between a turbocharger and a supercharger is that a supercharger is mechanically driven by the engine (often through a belt connected to
14763-403: The relatively simple debugging facilities of the IDE were insufficient, Turbopower Software produced a more powerful debugger, T-Debug. The same company produced Turbo Analyst and Overlay Manager for Turbo Pascal. T-Debug was later updated for Turbo Pascal 4, but discontinued with the release of Borland's Turbo Debugger (TD), which also allowed some hardware intervention on computers equipped with
14896-429: The resource limitations of early systems, many early languages were specifically designed so that they could be compiled in a single pass (e.g., Pascal ). In some cases, the design of a language feature may require a compiler to perform more than one pass over the source. For instance, consider a declaration appearing on line 20 of the source which affects the translation of a statement appearing on line 10. In this case,
15029-565: The rights and formed Jensen & Partners International to publish it as JPI TopSpeed Modula-2. Instead Borland chose to implement separate compiling in their established Pascal product. Separate compiling was not part of the standard Pascal language, but was already available in UCSD Pascal , which was very popular on 8-bit machines. Turbo Pascal syntax for units appears to have been borrowed from UCSD Pascal. Earlier versions of Turbo Pascal, designed for computers with limited resources, supported
15162-469: The same issue. One reviewer said that because of dialect differences "Turbo is not really Pascal. But it's very useful". While cautioning that it was not suitable for developing very large applications, he concluded that Turbo Pascal "is well written, fun to use at times, and fast enough to make up for its few shortcomings ... it is a bargain that shouldn't be passed up". A second called the DOS version "without doubt,
15295-548: The same version number: a less expensive "Turbo" package, and a "Borland" package with enhanced capabilities and more add-ons. This version, released on 2 May 1989, introduced object-oriented programming features for the Pascal language, including concept of classes, static and dynamic objects, constructors and destructors and inheritance, which would become the basis for the Object Pascal found in Borland Delphi. The IDE uses
15428-400: The simpler but more restricted .COM executables. The by-then obsolete CP/M and CP/M-86 operating system versions were dropped when Turbo Pascal was rewritten. Version 4 introduced units, and a full-screen text user interface with pull-down menus; earlier versions had a text-based menu screen and a separate full-screen editor. ( Microsoft Windows was still very experimental when the first version
15561-522: The software's low price, speed, and unusually good documentation for a compiler, and noted the existence of many utilities for Turbo Pascal from other companies. The review stated that the IDE that simplified the edit-compile-run-debug loop made Turbo Pascal accessible, like BASIC, to new programmers. Byte in 1989 listed Turbo C and Turbo Pascal as among the "Distinction" winners of the Byte Awards. Citing their user interface and continued emphasis on speed,
15694-471: The source code and compiled executable of a reasonable-sized program—as it was common at the time for users to have only a single floppy drive as mass storage , it was a great convenience to be able to fit both the compiler and the program being written on a single disc, avoiding endless disc swapping. The architecture of the various machines running MS-DOS additionally limited the maximum user memory to under 1 MB (e.g., machines hardware-compatible with
15827-490: The source code to build an internal representation of the program, called the intermediate representation (IR). It also manages the symbol table , a data structure mapping each symbol in the source code to associated information such as location, type and scope. While the frontend can be a single monolithic function or program, as in a scannerless parser , it was traditionally implemented and analyzed as several phases, which may execute sequentially or concurrently. This method
15960-469: The source language grows in complexity the design may be split into a number of interdependent phases. Separate phases provide design improvements that focus development on the functions in the compilation process. Classifying compilers by number of passes has its background in the hardware resource limitations of computers. Compiling involves performing much work and early computers did not have enough memory to contain one program that did all of this work. As
16093-440: The syntax of "sentences" of a language. It was developed by John Backus and used for the syntax of Algol 60 . The ideas derive from the context-free grammar concepts by linguist Noam Chomsky . "BNF and its extensions have become standard tools for describing the syntax of programming notations. In many cases, parts of compilers are generated automatically from a BNF description." Between 1942 and 1945, Konrad Zuse designed
16226-407: The turbocharger are: The turbine section (also called the "hot side" or "exhaust side" of the turbo) is where the rotational force is produced, in order to power the compressor (via a rotating shaft through the center of a turbo). After the exhaust has spun the turbine it continues into the exhaust piping and out of the vehicle. The turbine uses a series of blades to convert kinetic energy from
16359-401: Was at first identical to version 1's, down to having 1983 as the copyright date on some of the compiler's sample output, but had a separate "Addendum to Reference Manual: Version 2.0 and 8087 Supplement" manual with separate page numbering. Additions included an overlay system , where separate overlay procedures would be automatically swapped from disk into a reserved space in memory. This memory
16492-630: Was based on the Blue Label Pascal compiler originally produced for the NasSys cassette-based operating system of the Nascom microcomputer in 1981 by Anders Hejlsberg . Borland licensed Hejlsberg's "PolyPascal" compiler core ( Poly Data was the name of Hejlsberg's company in Denmark), and added the user interface and editor. Anders Hejlsberg joined the company as an employee and was the architect for all versions of
16625-432: Was developed for a Digital Equipment Corporation (DEC) PDP-10 computer by W. A. Wulf's Carnegie Mellon University (CMU) research team. The CMU team went on to develop BLISS-11 compiler one year later in 1970. Multics (Multiplexed Information and Computing Service), a time-sharing operating system project, involved MIT , Bell Labs , General Electric (later Honeywell ) and was led by Fernando Corbató from MIT. Multics
16758-539: Was part of the 64kB RAM used by the program's code, and was automatically the size of the largest overlay procedure. Overlay procedures could include overlay sections themselves, but unless a RAM disk was used, the resulting disk swapping could be slow. 2.0 also added the Dispose procedure to manage the heap , allowing individual dynamic variables to be freed, as an alternative to the more primitive 'Mark/Release' system and increased compatibility with WordStar commands plus use of
16891-520: Was released on 17 September 1986. Turbo Pascal 3 supported turtle graphics . In addition to the default software real numbers and 8087 edition of the compiler, Borland also offered a binary-coded decimal (BCD) version (TURBOBCD) which offered the same numeric range as real data types but to 18 significant figures. Released on 20 November 1987, Version 4 was a total rewrite, with both look and feel and internal operation much changed. The compiler generated executables in .EXE format under DOS, rather than
17024-456: Was released on 27 October 1992. Changes from 6.0 include support for the creation of DOS and Windows executables and Windows DLLs, and syntax highlighting. Compiler In computing , a compiler is a computer program that translates computer code written in one programming language (the source language) into another language (the target language). The name "compiler" is primarily used for programs that translate source code from
17157-405: Was released, Modula-2 was making inroads as an educational language which could replace Pascal. Borland, in fact, had a Turbo Modula-2 compiler, but only released it on CP/M (its user interface was almost identical to that of Turbo Pascal 1–3) with little marketing. A much improved DOS version was developed, but as Borland was unwilling to publish the results, the authors including Niels Jensen bought
17290-540: Was released, and even mice were rare.) An add-on package, the Turbo Pascal Graphix Toolbox, was available for Turbo Pascal V4. Colour displays were replacing monochrome; Turbo Pascal version 5.0, released 24 August 1988, introduced blue as the editor's default background color, used by Borland's DOS compilers until the end of this product line in the mid-1990s. It also added debugger support for breakpoints and watches. Later versions came in two packages with
17423-465: Was so slow" compared to Turbo Pascal. "He would bring in poor Greg Whitten [programming director of Microsoft languages] and yell at him for half an hour" because their company was unable to defeat Kahn's small startup, MacGregor recalled. By 1995 Borland had dropped Turbo/Borland Pascal and replaced it with the rapid application development (RAD) environment Borland Delphi , based on Object Pascal. The 32 - and 64-bit Delphi versions still support
17556-413: Was with interpreted BASIC or UCSD Pascal , which compiled to p-code which was then interpreted at runtime. Unlike some other development tools, Turbo Pascal disks had no copy protection . Turbo Pascal came with the "Book License": "You must treat this software just like a book ... [it] may be used by any number of people ... may be freely moved from one computer location to another, so long as there
17689-466: Was written in the PL/I language developed by IBM and IBM User Group. IBM's goal was to satisfy business, scientific, and systems programming requirements. There were other languages that could have been considered but PL/I offered the most complete solution even though it had not been implemented. For the first few years of the Multics project, a subset of the language could be compiled to assembly language with
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