By Mads Tofte
The starting place of this monograph is a direction entitled "Semantics directed Compiler new release" which Professor Neil D. Jones gave in 1982 at Copenhagen college, the place i used to be a pupil on the time. during this path, he defined a compiler generator, known as CERES, which he was once constructing. I instantly felt drawn to the weird blend of mathematical reasoning approximately com pilers and the small problematic construction blocks that made up the operating approach. As I got here to appreciate the process i found that in the present mathematical framework you'll be able to convey compiler iteration as a unique case of compilation; this resulted in a specification of a compiler generator which was once bootstrapped on itself leading to a machine-generated compiler generator. the aim of this monograph is to explain the CERES procedure we produced in 1983-84 and evaluate it with different structures, includ ing newer ones. additionally, it truly is as correct at the present time because it used to be then to debate the function of compiler turbines as an reduction within the layout and implementation of programming languages; this I do in Chap. five. This monograph is a strongly revised model of the cando scient.
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Additional resources for Compiler Generators: What They Can Do, What They Might Do, and What They Will Probably Never Do
OPS ..... OPS on «f(j sort "action" ..... [parameter 1] ;. OPS [parameter2] ..... pushconst. EAP. OPS (* . CONPAR. OPS) ..... open-apar-stream . OPS ; . OPS [action] ; . OPS close-stream. EA . OPS * 13 * * 14 * * 48 2. Report on the Compiler Generator CERES -+ nextlab . EA. OPS -+ pushlab . AP. OPS ( •. CONFAB. OPS) -+ OPS on f(f€ sort "action" -+ SKIP. OPS -+ enterlab . AP . OPS ( •. CONFAB. OPS • . APARGO . OPS • . LABELDEFN . OPS [body] ;. OPS [action] ; . OPS close-stream. EA. OPS # # # ####################################### ID sort "variable" ID sort ''variable'' ####################################### -+ • .
This is actually the LOOP compiler which CERES produces, given the LOOP definition of Fig. 7 as input. 13 should be compared with the compiling LOOP definition of Fig. 12. We will refer to Fig. 12 as "the compiling definition" and to Fig. 13 as "the compiler". In the compiler we have one sw-action for each rule in the compiling definition. The second p;lfameter of sw is a label, to which sw will make a jump provided the node of the current syntax tree matches the first parameter of sw. Recursive calls and returns in the compiler are handled by the elementary actions pcaJl(start-label, subtree-no, return-label) and preturn.
ANY&) 396 (ADDCODEPAR ' PUSHVAR) 397 (PRETURN) 398 (GOL:13) 399 L:12 (NEWPARS) 400 (PUSHCONST ' ANY&) 401 (ADDCODEPAR' PUSHCONST) 402 (PRETURN) 403 (GO L: 11) 404 (ADDCODE ' READ) L:8 405 (PCALL ' L:6 1 ' L:9) 406 (PCALL' L:6 2 ' L: 10) 407 L:9 (ADDCODE . 5 The Compiler Generator ~ (virtual) ~ (virtual) 33 ~ Y~T~T d d 0 dS2T comp direct compiler generation (reality) Fig. 14 Using the idea of composition to obtain one-step compiler generation point is that cocom obtains this effect without ever building the compiling definition: cocom produces the compiler directly in one step.
Compiler Generators: What They Can Do, What They Might Do, and What They Will Probably Never Do by Mads Tofte