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SPV return from main: Simplify a legacy design such returns are not jumps to exit block.

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Structured control-flow rules allow leaving the middle of a construct through
a return, but not through a jump to a block that does a return.

Addresses issue #58.
This commit is contained in:
John Kessenich 2015-09-14 20:58:02 -06:00
parent 5f5b205ce9
commit e770b3e6cf
74 changed files with 9648 additions and 9816 deletions
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16
SPIRV/SpvBuilder.h
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@ -195,23 +195,16 @@ public:
// Make the main function.
Function* makeMain();
// Return from main. Implicit denotes a return at the very end of main.
void makeMainReturn(bool implicit = false) { makeReturn(implicit, 0, true); }
// Close the main function.
void closeMain();
// Make a shader-style function, and create its entry block if entry is non-zero.
// Return the function, pass back the entry.
Function* makeFunctionEntry(Id returnType, const char* name, std::vector<Id>& paramTypes, Block **entry = 0);
// Create a return. Pass whether it is a return form main, and the return
// value (if applicable). In the case of an implicit return, no post-return
// block is inserted.
void makeReturn(bool implicit = false, Id retVal = 0, bool isMain = false);
// Create a return. An 'implicit' return is one not appearing in the source
// code. In the case of an implicit return, no post-return block is inserted.
void makeReturn(bool implicit, Id retVal = 0);
// Generate all the code needed to finish up a function.
void leaveFunction(bool main);
void leaveFunction();
// Create a discard.
void makeDiscard();
@ -516,7 +509,6 @@ protected:
Block* buildPoint;
Id uniqueId;
Function* mainFunction;
Block* stageExit;
AccessChain accessChain;
// special blocks of instructions for output