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annotate OrthancFramework/Resources/WebAssembly.txt @ 5858:66fd63b8601e find-refactoring tip

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author Alain Mazy <am@orthanc.team>
date Mon, 04 Nov 2024 22:34:14 +0100
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2 ======================================
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3 == Notes about WebAssembly ===========
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4 ======================================
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8 Trap mode
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9 =========
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10
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11 The BINARYEN_TRAP_MODE specifies what to do when divisions per zero
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12 (and similar conditions like integer overflows) are encountered. This
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13 can be set through the option "EMSCRIPTEN_TRAP_MODE" in Orthanc.
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17 Previous versions (<= 1.7.1)
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18 ----------------------------
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19
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20 The "clamp" mode avoids throwing errors, as they cannot be properly
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21 catched by "try {} catch (...)" constructions. HOWEVER, the "upstream"
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22 backend of Emscripten (which is now the default) doesn't support this
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23 option.
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24
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25 In Orthanc <= 1.7.1, the "clamp" mode was used by default. As a
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26 consequence, there was an old flag "EMSCRIPTEN_SET_LLVM_WASM_BACKEND"
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27 to setting BINARYEN_TRAP_MODE.
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28
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29 Here is the definition of the parameter that was in
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30 "OrthancFrameworkParameters.cmake":
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31
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32 >>>>>
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33 set(EMSCRIPTEN_SET_LLVM_WASM_BACKEND OFF CACHE BOOL "Sets the compiler flags required to use the LLVM Web Assembly backend in emscripten")
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34 <<<<<
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35
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36 Setting this option to "ON" fixes error: "shared:ERROR:
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37 BINARYEN_TRAP_MODE is not supported by the LLVM wasm backend" if using
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38 the "upstream" backend of Emscripten. Here is the corresponding
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39 implementation that was in "Compiler.cmake":
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40
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41 >>>>>
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42 if (NOT EMSCRIPTEN_SET_LLVM_WASM_BACKEND)
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43 set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -s BINARYEN_TRAP_MODE='\"clamp\"'")
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44 endif()
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45 <<<<<
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48 The "EMSCRIPTEN_SET_LLVM_WASM_BACKEND" option was totally removed in
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49 Orthanc 1.8.1.
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54 Linker flags
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55 ============
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56
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57 Since Orthanc 1.7.2, "Compiler.cmake" doesn't set any linking option
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58 for Emscripten. In Orthanc <= 1.7.1, the following was done:
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59
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60 >>>>>
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61 set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -s EXTRA_EXPORTED_RUNTIME_METHODS='[\"ccall\", \"cwrap\"]'")
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62 <<<<<